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| 1.
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田中, 隆太郎 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明 ; 林, 勇伝 ; 草野, 岳彦 ; Tanaka, Ryutaro ; Hosokawa, Akira ; Ueda, Takashi ; Furumoto, Tatsuaki ; Lin, Yongchuan ; Kusano, Takahiko
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金沢大学理工研究域機械工学系<br />炭素鋼の旋削加工における切りくず処理性の向上の目的で，S45Cに半導体レーザを用いて長手方向にライン状に熱処理を行い，超硬，サーメットおよびセラミック工具を用いて旋削を行い，その有効性について検討を行
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った．その結果，切りくず処理性に改善が見られ，レーザ熱処理により切りくず処理性の改善が可能であることがわかった．また，仕上げ面粗さ，切削抵抗や切りくず厚さもわずかながら影響を受けることがわかった．<br />出版者照会後に全文公開
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嶋村, 公二 ; 細川, 晃 ; 上田, 隆司 ; 政, 誠一 ; Shimamura, Koji ; Hosokawa, Akira ; Ueda, Takashi ; Masa, Seiichi
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金沢大学理工研究域機械工学系<br />UBM(UnBalanced Magnetron)スパッタ法によってコーティングしたエンドミルを作製し、SUS304の高速切削に適用している. 従来の耐熱性を付与する考え方から, 潤滑性を付与して熱の
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発生を抑えることに着目し開発している. 従来のコーティング工具に比べて, 良好な仕上げ面と長い工具寿命が得られている.<br />The UBM(UnBalanced Magnetron) sputtering method is applied to the coated end mills and some kinds of such tools are used in high-speed milling of SUS304. This coating film is designed to improve lubricating ability rather than heat resistance. Long tool life and good surface quality are obtained with these UBM-type coated tools than standard commercially available coated tools in high-speed side milling without coolant.<br />出版者照会後に全文公開
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嶋村, 公二 ; 山口, 絵美 ; 政, 誠一 ; 細川, 晃 ; Shimamura, Koji ; Yamaguchi, Emi ; Masa, Seiichi ; Hosokawa, Akira
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金沢大学理工研究域機械工学系<br />対向デュアルビーム・アーク蒸着装置によって金型の深穴内面へTiN膜を生成し，膜厚分布を検証している．従来のPVDコーティングでは膜生成が不可能であったL（長さ）/D（内径）＝5の深穴において，本製法で
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は全面にTiN膜を生成することができる．また，深穴の奥部でも、入口部と同等の組成および塑性変形硬さが得られる．深穴を有する粉末成形用金型へ適用した結果、従来比10倍以上の寿命向上を実現している．<br />出版者照会後に全文公開
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藤江, 典久 ; 三野, 大樹 ; 上田, 隆司 ; 細川, 晃 ; 山田, 啓司 ; Fujie, Norihisa ; Mino, Daiki ; Ueda, Takashi ; Hosokawa, Akira ; Yamada, Keiji
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金沢大学理工研究域機械工学系<br />Thermal stress cleaving is a prospective technique for separating a wafer or thin plate from brittle
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materials such as glasses and ceramics. In this paper, the cleaving mechanism of a glass and a sapphire irradiated with CO2 laser is investigated. A high frequency pulsed laser is used for the purpose of investigating the mechanism of crack propagation more precisely. The AE signal is measured to examine the characteristics of crack propagation. Thermal damage to the surface of the glass causes the deterioration of cleaving accuracy. Consequently, it is important to minimize the thermal damage by controlling the prosess parameters.<br />熱応力割断はガラスやセラミックといった脆性材料の加工方法として，近年注目されてきている．本研究では，CO2レーザを用いた液晶表示用ガラスおよびサファイアの割断メカニズムについて調査している．き裂の進展メカニズムをより精密に調べる為，高周波数パルス発振のレーザ加工機を用いている．またAE信号測定を行い，き裂進展の状況を観測している．その結果，AE信号によって，き裂の挙動を観察することができることを示している．ガラス表面の熱損傷によって，割断の精度が悪化する為，加工パラメータを制御し，熱損傷を抑えることが重要である．<br />出版者照会後に全文公開
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藤江, 典久 ; 有川, 龍郎 ; 上田, 隆司 ; 細川, 晃 ; 古本, 達明 ; 田中, 隆太郎 ; Fujie, Norihisa ; Arikawa, Tatsuro ; Ueda, Takashi ; Hosokawa, Akira ; Furumoto, Tatsuaki ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />Laser cleaving is a prospective technique for separating a wafer or thin plate from brittle material
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s such as glasses and ceramics. However, there is a problem that laser irradiation often causes the thermal damage. Thermal damage to the surface of the glass causes the deterioration of cleaving accuracy. Consequently, it is important to minimize the thermal damage. In this paper, new cleaving technique is proposed, it uses CO2 laser and Er:YAG laser, and how inhibit the thermal damage is investigated.<br />近年，セラミックスや，ガラス等の脆性材料の切断法として，従来のダイヤモンドブレードダイシングに比べて切り代が小さく，清浄な加工が可能なレーザ熱応力割断が注目を集めている．しかしながら，レーザ照射に伴う温度上昇によって加工物に副き裂やはく離が生じるなどの熱的影響が問題となっている． そこで本研究では，CO2レーザを単独で照射した場合，CO2レーザとEr:YAGレーザの2つのレーザ同時に照射した場合について，ガラスを割断する方法を提案し，熱的影響抑制の効果について検討する．<br />出版者照会後に全文公開
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菱田, 貴一 ; 古本, 達明 ; 橋本, 洋平 ; 小谷野, 智広 ; 細川, 晃 ; Hishida, Kiichi ; Furumoto, Tatsuaki ; Hashimoto, Yohei ; Koyano, Tomohiro ; Hosokawa, Akira
概要:
金沢大学理工研究域機械工学系<br />積層造形法は，3次元CADデータをもとに薄い金属粉末層にレーザを照射する工程を繰り返すことで立体形状を得る加工法である．この手法で製作したモデルは，レーザ照射にともなって熱変形を生じ，寸法精度の低下を
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もたらす．これまでの実験により粉末と土台の組み合わせにより異なる挙動を示すことが分かっている．本研究では，熱構造連成解析により造形中のモデルの温度分布の推定を行い，変形メカニズムを詳細に調査した．<br />出版者照会後に全文公開
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| 7.
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林, 勇伝 ; 田中, 隆太郎 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明 ; Lin, Yongchuan ; Tanaka, Ryutaro ; Hosokawa, Akira ; Ueda, Takashi ; Furumoto, Tatsuaki
概要:
金沢大学理工研究域機械工学系<br />This study deals with the machinability of steels in turning with additional current. Tested work ma
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terials were plane carbon steel JIS S45C and BN added steel which has good machinability in turning at high cutting speed. Turning tests were performed by carbide tool K10, P10, P20, P30, Cemet tool and TiCN coated carbide tool to clarify the influence of chemical compositions of tool materials on the cutting mechanism of BN added steel. The cutting force was investigated practically and these results were discussed.<br />著者らはこれまでに，超硬合金P30を用いた高速対応型快削鋼であるBN添加鋼の旋削加工において，切削中における工具-被削材間への外部通電が工具摩耗に影響を与えることを報告した．そこで本報では，工具材種の影響を調べるために，化学成分が異なる種々の工具を用いたBN添加鋼の旋削加工を行い，工具-被削材間に流れる電流の大きさおよび方向と切削抵抗の関係について調査し，標準鋼切削時と比較し検討を加えた．<br />出版者照会後に全文公開
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| 8.
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脇村, 嘉宏 ; 倉谷, 泰治 ; 上田, 隆司 ; 古本, 達明 ; 細川, 晃 ; 田中, 隆太郎 ; Wakimura, Yoshihiro ; Kuratani, Yasuharu ; Ueda, Takashi ; Furumoto, Tatsuaki ; Hosokawa, Akira ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />新しい矯正加工法としてCO2レーザを用いた矯正加工法を考案した。この方法は、レーザ照射部に発生する熱応力を利用して材料を塑性変形させて矯正する加工法である。レーザの持つ高いエネルギ密度、微小スポット径
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により高い精度で局所的な加工が行える。さらに入熱量も制御しやすいため自動化も容易である。<br />出版者照会後に全文公開
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| 9.
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古本, 達明 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎 ; 嵐, 友哉 ; 杉原, 成良 ; 和賀, 正明 ; 今野, 明 ; Furumoto, Tatsuaki ; Ueda, Takashi ; Hosokawa, Akira ; Tanaka, Ryutaro ; Arashi, Tomoya ; Sugihara, Nariyoshi ; Waga, Masaaki ; Konno, Akira
概要:
金沢大学理工研究域機械工学系<br />In dental treatment with Nd:YAG laser, the laser beam which ordinarily comes out from the optical fi
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ber is effective to eliminate the enamel and the dentin. A diffused and circumferential laser beam, which is produced by using a processed optical fiber at the tip, is effective for the treatment of soft tissue. In this report, the processing characteristics of the enamel and the dentin by the titanium–processed fiber (TP fiber) are investigated. On the cavity made in the enamel and the dentin, the volume and maximum depth are measured by a 3D surface profiling system and compared with that of the non–processed fiber. Furthermore, the cavity of the enamel made by Nd:YAG laser beam are observed by the high–speed video camera. 本研究は,Nd:YAGレーザを用いた高度歯科治療の実現を目的として行っている.これまで,ファイバ先端を酸化チタン粉末で加工してレーザ直進光を減衰させ,360度全方位にレーザ照射を行う手法を提案した.そして,加工条件の検討により先端のエネルギ分布が調整可能なことを示した.本報告では,先端加工ファイバを用いた歯質の窩洞形成特性を調べると共に,その歯質表面を高速度カメラで撮影した内容について考察する.<br />出版者照会後に全文公開
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古本, 達明 ; 上田, 隆司 ; 加納, 康弘 ; 細川, 晃 ; 田中, 隆太郎 ; Furumoto, Tatsuaki ; Ueda, Takashi ; Kano, Yasuhiro ; Hosokawa, Akira ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />Recently, a multifunction machine, in which a ferrous based powder bed is selectively heated and fus
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ed by a laser beam irradiation and the edge of consolidated structure obtained is cut with end mill, has been developed to produce an injection molding die. This device has an advantage that the molding die does not have to divide into each block for locating the cooling channels. However, it has difficulty finishing the inner wall located as cooling channels in the injection mold. This paper deals with a polishing of inner wall with flowing slurry at high performance. In order to investigate the influence of various conditions on the polishing of the inner wall, the effects of grain size and polishing time on the polishing characteristics are evaluated experimentally. 近年，金属粉末の積層造形と造形物表面の仕上げ加工を複合化し，高精度に射出成形用金型を造形する加工機が開発され注目されている．本研究では，同装置で製作した金型の冷却水管について，その内面を遊離砥粒でクリーニングを行う新しい加工法を提案する．まずまじめに，その加工原理と各加工条件が内面性状に与える影響について調べた結果について報告する.<br />出版者照会後に全文公開
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近藤, 明彦 ; 古本, 達明 ; 上田, 隆司 ; 細川, 晃 ; Koudou, Akihiko ; Furumoto, Tatsuaki ; Ueda, Takashi ; Hosokawa, Akira
概要:
金沢大学理工研究域機械工学系<br />航空機の高温構造部材に用いられるセラミックマトリックス複合材料（CMC）は，難削材であるため機械加工が難しく，加工効率や工具寿命などの点で課題を有している．本研究では，レーザを用いてCMC表面を局所加
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熱し，加熱部を切削することで被削性を向上させるレーザ援用切削について扱っている．形状およびコーティング材種の異なる4種類の工具を用いて，被削性や加工面粗さなどを評価した結果について述べる.<br />出版者照会後に全文公開
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古本, 達明 ; 上田, 隆司 ; Abdullah, Yassin ; 細川, 晃 ; 田中, 隆太郎 ; 阿部, 諭 ; Furumoto, Tatsuaki ; Ueda, Takashi ; Yassin, Abdullah ; Hosokawa, Akira ; Tanaka, Ryutaro ; Abe, Satoshi
概要:
金沢大学理工研究域機械工学系<br />In order to manufacture the part of a small lot at lower cost and shorter lead-time, various techniq
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ues, such as a rapid tooling, reverse engineering and high speed milling, are proposed. Recently, milling-combined laser metal sintering system (MLMS), which is the devise of sintering the metal powder and milling the sintered metal with end mill at the one process, has been developed to produce the injection molding dies. In this report, the sintering characteristics of the metal powder used for rapid tooling with Yb:fiber laser are described. Relationship between the surface roughness of the plate and sintering conditions, such as a scanning speed and laser power, are investigated. Moreover, the adhesion force between the each plate and the sintered line are measured with dynamometer. 本研究は，ファイバーレーザを用いて金属粉末を高精度に三次元造形することを目的として行っている．異なる面性状を有する鋼材プレート上に，ファイバーレーザを用いてライン焼結を行い，レーザ焼結条件と各種プレート上における焼結特性との関係を調べると共に，燒結金属の切削特性を調べてプレートに対する密着強度を評価している.<br />出版者照会後に全文公開
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古本, 達明 ; Abdullah, Yassin ; 塚本, 卓 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎 ; 阿部, 諭 ; Furumoto, Tatsuaki ; Yassin, Abdullah ; Tukamoto, Takashi ; Ueda, Takashi ; Hosokawa, Akira ; Tanaka, Ryutaro ; Abe, Satoshi
概要:
金沢大学理工研究域機械工学系<br />A simple measurement method of a thermal conductivity in fine metal powder for rapid prototyping is
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proposed. When the heating time to the metal powder t is short enough compared with the time until the metal powder reaches the maximum temperature T (t/T<0.1), and the measurement depth from a surface Z is longer than the diameter of the heat source a (Z/a>1.23), it is shown that the thermal conductivity of a metal powder can be calculated precisely by measuring the time that the temperature reaches the maximum value. As work materials, SCM powder and copper powder are used. As a result, the thermal conductivity of a metal powder and a sintered material are quite small compared with that of a metal, and the materials, the shapes and the diameter of a metal powder have little influence on the thermal conductivity. 金属粉末をレーザ焼結するとき,レーザ光の吸収特性や生じた熱の伝導特性を知ることが重要となる.本研究では,粉末表面に照射したレーザ光で生じた熱が,粉末内部の一定距離離れた位置まで伝導する時間を測定することで,簡易的に粉末の熱伝導率を導出する手法を提案している.また,同手法で金属粉末の材質,粒径,形状の違いによる熱伝導率の変化を調べると共に,レーザ焼結した材料の焼結条件と熱伝導特性について調べている.<br />出版者照会後に全文公開
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橋本, 洋平 ; 近藤, 亮太 ; 古本, 達明 ; 小谷野, 智広 ; 細川, 晃 ; Hashimoto, Yohei ; Kadono, Ryota ; Furumoto, Tatsuaki ; Kayano, Tomohiro ; Hosokawa, Akira
概要:
金沢大学理工研究域機械工学系<br />ウェハ製造に用いられる両面研磨加工において，加工現象の理解に重要であるウェハ挙動は未だ解明されていない．これに対し，本研究では，ウェハと上下の定盤，キャリアとの接触により生じる力とモーメントのつりあい
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に着目した，ウェハ挙動の解析技術の開発を行う．本報では，上下の定盤との接触により生じる圧力分布を一様とした条件において解析を行い，研磨条件によるウェハ挙動の違いを明らかにする.<br />出版者照会後に全文公開
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細川, 晃 ; 佐藤, 孝志 ; 山田, 啓司 ; 上田, 隆司 ; Hosokawa, Akira ; Sato, Takashi ; Yamada, Keiji ; Ueda, Takashi
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金沢大学理工研究域機械工学系<br />前報ではA系砥石を対象として，種々のドレス条件で作成した異なった砥石作業面を研削音で識別できることを示した．本報では，無気孔型超砥粒砥石への適用性について検討している．レジンボンドCBN砥石について，
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砥粒突出し量を変化させて異なった状態を形成した場合，研削音によって識別可能であることがわかった．ただし，A系砥石と異なり，識別に用いる周波数帯域によって識別精度が大きく影響を受ける．このことより，砥石作業面の特徴を顕著に表す周波数領域を用いる必要性が確認された.<br />出版者照会後に全文公開
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吉田, 剛 ; 細川, 晃 ; 古本, 達明 ; 田中, 隆太郎 ; 上田, 隆司 ; Yoshida, Takeshi ; Hosokawa, Akira ; Furumoto, Tatuaki ; Tanaka, Ryutaro ; Ueda, Takashi
概要:
金沢大学理工研究域機械工学系<br />Nd:YAGレーザによるメタルボンドダイヤモンド砥石のレーザドレッシング法を検討している．これまで，レーザと同時にエアを吹き付けることによって，ボンド剤が再凝固する前に除去できることを明らかにした．本
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法では，さらなる効率化とより実用的な観点から，レーザとエアを同時に照射可能な一体型ヘッドを作製し，それによるドレッシング特性を検討している.<br />出版者照会後に全文公開
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田中, 隆太郎 ; 細川, 晃 ; 山田, 啓司 ; 上田, 隆司 ; 林, 勇伝 ; Tanaka, Ryutaro ; Hosokawa, Akira ; Yamada, Keiji ; Ueda, Takashi ; Lin, Yongchuan
概要:
金沢大学理工研究域機械工学系<br />This study deals with the machinability of steels in turning with additional current. Tested work ma
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terials were plane carbon steel JIS S45C and BN added steel which has good machinability at high cutting speed. Turning tests were performed by carbide tool P30 in order to investigate the influence of electrical conditions of closed circuit system on the cutting mechanism of BN added steel. The tool life and cutting force was investigated practically and these results were discussed. 従来,鋼の被削性を改善するために快削性添加物や鋼中の介在物の組成や形態を制御するなど多くの快削鋼が研究·開発がされてきた.その中のひとつであるBN添加鋼は切削中にベラーグと呼ばれる保護膜を摩耗面上に形成し,高速域で標準鋼に比べ工具摩耗を大幅に抑制する.本研究ではこのBN添加鋼を最大20mAの微量通電下で超硬工具による旋削加工を行い電流量と摩耗量の関係を調べ,その摩耗抑制効果について検討を行った.<br />出版者照会後に全文公開
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Hery, Mochtady ; 山田, 啓司 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎 ; Yamada, Keiji ; Ueda, Takashi ; Hosokawa, Akira ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />レーザ誘起熱変形によってプラスチック球状レンズおよびレンズアレイを作製する方法については前報において報告した。本研究ではEr:YAGレーザビームを照射しながらプラスチック試料を移動させることで直線状お
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よびリング状のシリンドリカルレンズを作製し、レンズ形状と加工条件の関係について検討している。<br />出版者照会後に全文公開
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| 19.
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桑畑, 俊也 ; 上田, 隆司 ; 古本, 達明 ; 田中, 隆太郎 ; 細川, 晃 ; 武田, 怜子 ; Kuwahata, Toshiya ; Ueda, Takashi ; Furumoto, Tatsuaki ; Tanaka, Ryutaro ; Hosokawa, Akira ; Takeda, Reiko
概要:
金沢大学理工研究域機械工学系<br />レーザ加工において困難である金属への種々形状微細除去加工を，本研究では種々形状のマイクロレンズを製作，利用することによって可能としている．アクリル樹脂にEr:YAGレーザを走査させることによりマイクロ
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レンズを製作し，このレンズを用いてNd:YAGレーザ第２高調波を試料表面に集光させて加工を行う．さらに，ヘリンボーンと呼ばれる微細構造をクロム鋼表面に加工した後，摩擦特性へ与える影響について検討する.<br />出版者照会後に全文公開
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| 20.
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細川, 晃 ; 南部, 彰 ; 田中, 隆太郎 ; 山田, 啓司 ; 上田, 隆司 ; Hosokawa, Akira ; Nambu, Akira ; Tanaka, Ryutaro ; Yamada, Keiji ; Ueda, Takashi
概要:
金沢大学理工研究域機械工学系<br />前報では光ファイバ型2色温度計を用いてエンドミル加工におけるオイルミスト供給時の工具逃げ面温度を測定し,ミスト粒径,ミスト流量,ミスト供給位置が工具逃げ面温度に及ぼす影響について検討した.本報では,そ
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の第3段階として,超硬工具およびコーティング工具における切削温度と工具損耗量を測定し,オイルミスト供給が工具損耗形態に及ぼす影響について詳細に検討している.<br />出版者照会後に全文公開
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| 21.
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細川, 晃 ; 柚木, 力 ; 上田, 隆司 ; 山田, 啓司 ; 田中, 隆太郎 ; Hosokawa, Akira ; Yunoki, Tsutomu ; Ueda, Takashi ; Yamada, Keiji ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />This study deals with a laser dressing of a metal-bonded diamond wheel as part of a laser conditioni
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ng of superabrasive grinding wheels including truing, sharpening and cleaning. A bronze bond diamond stone SD120N75B is chosen as target to be dressed and pulsed Nd:YAG laser is irradiated in order to remove the bond material. The bond material is partially removed by laser irradiation, in which melting and vaporizing take place. In order to efficiently remove the bond material, it is necessary to spray air on the laser irradiating spot so as to blow away the molten binder before it solidifies again, although the molten metal cannot be perfectly taken away due to its relatively high viscosity. Clear damages of diamond particles such as micro-cracks or graphitization are not observed below the laser power is less than 152 W.Nd:YAGレーザを用いたメタルボンドダイヤモンド砥石(SD120N75NB)のレーザドレッシング法について検討している.ホイールにレーザを照射するとブロンズボンドは溶融除去されるが,多くは再凝固するため,効率的にボンド剤を除去するためには圧縮空気によって溶融部を吹き飛ばす必要がある.レーザの照射エネルギーを152W以下に制限することによって,ダイヤモンド砥粒に熱的ダメージをあまり与えることなく結合剤を除去することができる.<br />出版者照会後に全文公開
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| 22.
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山田, 啓司 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎 ; 堀居, 直幸 ; Yamada, Keiji ; Ueda, Takashi ; Hosokawa, Akira ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />レーザを用いた歯科治療における窩洞形成時の熱損傷を監視する装置を開発し,その有効性について検証している.装置は,光ファイバ,分光器およびイメージセンサーから成っており,レーザ照射時に発生するプルーム光
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を観測している.硬組織に熱損傷が生じる際には,波長560nmの強い輝線スペクトルが観測され,損傷なく窩洞が形成される場合には,輝線スペクトルは観測されない.<br />出版者照会後に全文公開
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| 23.
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小谷野, 智広 ; 本多, 拓人 ; 細川, 晃 ; 古本, 達明 ; 橋本, 洋平 ; Koyano, Tomohiro ; Honda, Takuto ; Hosokawa, Akira ; Furumoto, Tatsuaki ; Hashimoto, Yohei
概要:
金沢大学理工研究域機械工学系<br />電解加工においては，数十nsの超短パルス電圧の使用により極間距離が数μmとなり，マイクロ加工が可能となっている．大面積の加工においても同様な効果が期待できるが，加工面積に比例して流れる総電流が増加する
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ため，加工回路のインピーダンスの影響が大きくなる．そこで本研究では，電気二重層を考慮した極間の電位分布の数値解析と，加工電源の回路方程式を連成解析することで，加工電源のインピーダンスの影響を検討した.<br />出版者照会後に全文公開
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| 24.
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松永, 隆秀 ; 上田, 隆司 ; 古本, 達明 ; 細川, 晃 ; 長友, 正平 ; Matsunaga, Takahide ; Ueda, Takashi ; Furumoto, Tatsuaki ; Hosokawa, Akira ; Nagatomo, Syohei
概要:
金沢大学理工研究域機械工学系<br />レーザ割断は、レーザ照射によって発生する熱応力を利用して加工物を分断する加工法である。先行研究より、レーザ割断をサファイアに適用することは有効であることがわかっている。本研究では、表面に溝加工が施され
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たサファイアウエハを対象にして、様々なレーザ照射条件でサファイアウエハの割断を行った。また、レーザ照射に伴う表面温度上昇によって生じる割断面への影響について調べた。<br />出版者照会後に全文公開
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| 25.
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森本, 雅憲 ; 鈴木, 将吾 ; 細川, 晃 ; 上田, 隆司 ; 田中, 隆太郎 ; Morimoto, Masanori ; Suzuki, Shogo ; Hosokawa, Akira ; Ueda, Takashi ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />In general, grinding heat causes various types of thermal damage to the workpiece, such as burning,
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cracks, and phase transformation. In this study, the grinding operation is regarded as a heat treatment process called grind-hardening. This new heat treatment method enables the phase transformation from austenite to martensite in the surface layer of steels. The cylindricalgrinding tests at several infeed rates are carried out. The hardened layer of approximately 0.16 mm is attained in plunge grinding of chrome-molybdenum steel SCM435. 研削時に発生する熱を積極的に利用して，加工と同時に熱処理する鋼材の同時硬化研削法（研削焼入れ）を試みている．本報では，CrMo鋼の円筒研削焼入れを行い，その可能性を実証している．工作物の研削面に変色した酸化膜がみられたとき，表面近傍に焼入れ処理がなさ，この酸化膜をスパークアウトによって除去することで焼入れされた仕上げ面が生成できる．乾式研削において，40micron/sをこえる砥石切込速度で，工作物表面近傍に700HV以上のマルテンサイト組織の硬化層が得られた．砥石切込速度に比例して，研削抵抗，硬化層深さの増加がみられる．本研究では最大深さ160micronを得ることができた.<br />出版者照会後に全文公開
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| 26.
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青木, 慎太郎 ; 葛西, 惇士 ; 上田, 隆司 ; 細川, 晃 ; 古本, 達朗 ; 田中, 隆太郎 ; Aoki, Shintaro ; Kasai, Atsushi ; Ueda, Takashi ; Hosokawa, Akira ; Furumoto, Tatsuaki ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />歯質表面にレーザ照射した時、レーザ光は吸収され表面は加熱される。溶融した歯質は再凝固層を形成し、また一部は蒸散する。この時、衝撃力が発生することが知られている。そこで本研究では、この衝撃力をひずみゲー
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ジとホプキンソン棒を組み合わせた衝撃試験装置により測定し、レーザ照射によって生じる物理現象が、歯科治療における殺菌効果に与える影響やそのメカニズムについて考察し解明することを目的としている。<br />出版者照会後に全文公開
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| 27.
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千徳, 英介 ; 上田, 隆司 ; 山田, 啓司 ; 細川, 晃 ; Sentoku, Eisuke ; Ueda, Takashi ; Yamada, Keiji ; Hosokawa, Akira
概要:
金沢大学理工研究域機械工学系<br />本研究では,板材のレーザフォーミング加工における加工パラメータと変形量の関係の解明を目指し,加工部表面，裏面温度を2組の光ファイバ型2色温度計を用いて測定している.これまで加工部温度,表裏温度差,照射
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領域の変形量への影響について報告した. 本報では,板厚の影響について調べ,これまでの結果から加工パラメータと変形角度の関係を示す式を導いた.<br />出版者照会後に全文公開
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| 28.
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千徳, 英介 ; 上田, 隆司 ; 山田, 啓司 ; 細川, 晃 ; 田中, 隆太郎 ; Sentoku, Eisuke ; Ueda, Takashi ; Yamada, Keiji ; Hosokawa, Akira ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />A thin stainless steel is bended by the irradiation of CO2 laser. Then both temperatures at irradiat
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ed and opposite surfaces are measured using two sets of the two-color pyrometer with an optical fiber. In this study, we investigate the effect of temperature difference between irradiated and opposite surfaces on deformation mechanism. The increase of diameter of laser beam and the decrease of thickness of material make the temperature difference smaller and change deformation mechanism from Temperature Gradient Mechanism (TGM) to Buckling Mechanism (BM).CO2レーザを用いてステンレス板材のフォーミング加工を行い,同時にレーザ照射部表面および裏面温度を2組の光ファイバ型2色温度計を用いて測定し, 表裏温度差と変形メカニズムの関係を調べた.実験結果から板厚が小さくなるほど,ビーム径が大きくなるほど表裏温度差は小さくなり,変形メカニズムが温度勾配メカニズム(TGM)からバックリングメカニズム(BM)へと変化することがわかった.<br />出版者照会後に全文公開
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中野, 洸二 ; 古本, 達明 ; 橋本, 洋平 ; 小谷野, 智広 ; 細川, 晃 ; Nakano, Koji ; Furumoto, Tatsuaki ; Hashimoto, Yohei ; Koyano, Tomohiro ; Hosokawa, Akira
概要:
金沢大学理工研究域機械工学系<br />In this study, laser irradiation state is visualized by a high-speed camera. The influence of laser
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condition, such as power and laser scanning speed, on the consolidation of metal powder was investigated. In addition, the aspect of sputtered particles from the melt pool were evaluated. As results, consolidated state was found to be different in spite of same energy density. Scattering direction of sputteringwas found to be related to the scanning speed. Counts of sputtered particles was found to be reduced when the scanning speed increase.粉末結合積層法では、従来の加工法と比べ製品が望ましい品質に達していないといった問題がある。造形条件の各パラメータによる品質への影響を調査した内容は数多く存在するが、粉末が溶融・固化する際の詳細なメカニズムは深く調査されていない。本研究では、高速度カメラを使用して粉末にレーザを照射する様子を観察し、撮影した動画並びに画像を基に結合メカニズムの解明を試みた内容について報告する。<br />出版者照会後に全文公開
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古本, 達明 ; 中谷, 馨 ; 林, 鉄也 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎
概要:
This paper deals with the removal characteristics of dental hard tissues by irradiation of a pulsed En:YAG laser beam wi
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th a wavelength of 2940 nm. The influence of water-layer thickness on the cavity preparation is experimentally investigated. As a specimen, extracted human tooth is used and the laser beam is irradiated to its surface through the optical fiber. Additionally, the phenomenon of the laser beam irradiation in the water environment is observed with a high speed video camera. As a result, the irradiated laser beam in water environment is immediately absorbed to water, and the evaporated area could make it possible to transmit the laser beam without any absorption. The removal volume on human tooth in water environment was increased with increasing the irradiated laser energy, and decreased with increasing the water-layer thickness. There were no thermal damages on the cavity surface in each condition. The eliminated volume in water environment was quite larger than that in air environment. The human tooth in water environment was eliminated by the bubble formation which was caused by laser beam irradiation in addition to the ablation of human tooth which was caused by the absorption of laser beam directly. © 2012 The Japan Society of Mechanical Engineers.
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木村, 繁男 ; 上田, 隆司 ; 細川, 晃
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田中, 隆太郎 ; 井上, 豪 ; 中川, 智博 ; 細川, 晃 ; 古本, 達明 ; 上田, 隆司
概要:
The authors have reported that the micro wavy surface formed by machining combined with laser heat treatment have higher
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static coefficient of friction compared with the surface finished by polishing or cutting. Therefore, this study was carried out to clarify the surface formation mechanism in order to control micro wavy height and the influence of lubricant viscosity on static frictional force. In practical use, high viscosity lubricant is used in wet brake to prevent oil leakage. At cutting after laser heat treatment, when the higher thrust force was, the higher micro wavy height was obtained. Thus, decreasing cutting speed or increasing feed rate, the obtained micro wavy height became higher. The static coefficient of friction of surface finished by polishing was decreasing with lubricant viscosity. This tendency was also seen at micro wavy surface. However, the static coefficient of friction of micro wavy surface was constantly higher than polished surface regardless of lubricant viscosity. © 2011 The Japan Society of Mechanical Engineers.
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山崎, 修平 ; 田中, 隆太郎 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明
概要:
タッピングは加工の最終工程に行われるため，タップが折損して製品に取り残されるなどの失敗は許されない．折損が発生する主な原因は工具摩耗である．したがって工具摩耗に大きな影響をおよぼす工具刃先温度の測定は重要である．しかし，タップ加工の温度測定
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に関する研究はほとんど行われていないのが現状である．そこで本研究では2色温度計を用いた加工温度測定システムの確立を試みた． In this study, the method for measurement of the tool edge temperature in tapping was proposed. The tool edge temperature was measured using the two- color pyrometer with an optical fiber. In addition, the vibration caused by tool edge-work piece contact was sensed by an acceleration pickup. Experiments were performed using TiN coated HSS-spiral tap (M10×1.5). As a result, the temperature outputs from tool edges and chips were able to be distinguished. In tapping of S45C-BN at cutting speed 30 m/min, the maximum tool edge temperature is about 400 oC. The tool edge temperature was increasing with cutting aria.
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| 34.
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上原, 祐也 ; 細川, 晃 ; 上田, 隆司 ; 田中, 隆太郎 ; 古本, 達明
概要:
難削材旋削加工における新しい技術として、ADRT（スピニングツール）が提案された．ADRTでは工具自身が回転するため，切れ刃の加熱(切削時)-冷却(空転時)サイクルが制御でき，工具寿命の増大が期待される．しかしながら，その加工特性は明らかに
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なっていない．そこで本研究では，非接触で微小領域の温度測定が可能な光ファイバ型２色温度計を用いて，スピニングツールの加熱－冷却特性を測定し，工具への熱負荷の面から本手法の有効性を検討している． Turning characteristics of austenitic stainless steel SUS304 with an actively driven rotary lathe tool is invented from the thermal aspects. The tool temperature during one revolution of this spinning tool is measured using a newly assembled two-color pyrometer. There is an optimum tool rotational speed at which the tool temperature is at a minimum with respect to the cutting conditions.
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| 35.
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嶋村, 公二 ; 細川, 晃 ; 上田, 隆司 ; 政, 誠一
概要:
UBMS (UnBalanced Magnetron Sputtering)法によってTiCNコーティングエンドミルを作製し，SUS304の高速切削に適用している．コーティング膜に耐熱性を付与する従来の考え方から，潤滑性を付与して熱の発生を
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抑えることを主眼において開発している．光ファイバ型２色温度計を用いて測定した結果，一般的なAIP法によるコーティングエンドミルに比べて，加工中の工具温度が低減されている． The UBMS (UnBalanced Magnetron sputtering) method is applied to the coated end mills and some kinds of such tools are used in high-speed milling of SUS304. This coating film is designed to improve lubricating ability rather than heat resistance. Lower cutting temperature is measured with these UBMS-type TiCN-coated tools than the ordinary AIP-coated tools in high-speed side milling without coolant.
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| 36.
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岡田, 将人 ; 細川, 晃 ; 浅川, 直紀 ; 藤田, 祐介 ; 上田, 隆司
概要:
The effect of minimum quantity lubrication (MQL) method in end milling of stainless steel and titanium alloy that are ty
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pical difficult-to-cut materials with coated carbide tool is investigated. The effect is mainly evaluated by tool flank temperature, cutting force and tool wear behavior. The tool flank temperature is measured using a two-color pyrometer with an optical fiber having small measurement area and high response speed under non-contact condition with tool. In MQL cutting of SUS304 and Ti-6A1-4V at cutting speed v=25m/min, the tool flank temperature decreases approximately 50°C and 100°C than the case of dry cutting respectively, and the effect of MQL on tool flank temperature is especially obtained in low-speed cutting. On the other hand, the tool flank temperature in MQL cutting of Ti-6A1-4V is higher than the case of dry cutting in cutting speed v=100m/min or more. In the high-speed cutting of Ti-6A1-4V, it is observed that the several chips adhere on the rake face of cutting edge. In addition, the output voltages from detector are obtained when the adhesion chips on the cutting edge pass through the measurement area of two-color pyrometer. In the case of the SUS304, the feed and thrust force are decreased by the supplying oil mist in high speed cutting. The generation of micro-crack at cutting edge is contained by applying MQL even high speed cutting of Ti-6A1-4V that is not obtained the effect of temperature decreasing. © 2012 The Japan Society of Mechanical Engineers.
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| 37.
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澤崎, 亮介 ; 上田, 隆司 ; 山田, 啓司 ; 細川, 晃 ; 田中, 隆太郎
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野崎, 隆太郎 ; 上田, 隆司 ; 細川, 晃 ; 山田, 啓司 ; 田中, 隆太郎
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| 39.
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岡田, 将人 ; 上田, 隆司 ; 細川, 晃
概要:
The cutting performance of indexable insert drill that has non-axisymmetrical geometry is investigated. A solid drill th
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at has axisymmetrical and twisted geometry is also used to compare the cutting characteristics. The diameter of drills is 16mm and carbon steel is used as work material. The application effects of MQL that oil mist is supplied from oil holes in the tool are also examined. The temperature of peripheral corner edge of outer insert is measured using a two-color pyrometer with an optical fiber. The tool temperature of indexable insert drill is higher than that of solid drill and it reaches approximately 525°C at highest. On the other hand, the thrust force of indexable insert drill is lower than that of solid drill and it do not change so much with cutting speed. The surface roughness of indexable insert drill is approximately 1.15-5.4μm and this is higher than that of solid drill in each cutting speed. However, it is improved by supplying the oil mist.
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| 40.
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古本, 達明 ; 楠, 大樹 ; 網野, 亨 ; 細川, 晃 ; 田中, 隆太郎 ; 上田, 隆司
概要:
金属粉末の積層造形と造形物表面の切削加工によって得られる金型は，3次元CADで設計された冷却用水管を自由に配置できる特長を有し，射出成形時のサイクルタイム短縮が実現されている．しかしながら，オーバーハング部である水管上面は原理上切削できない
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課題を有していた．本研究では，金型内部の冷却用水管について，水管内に遊離砥粒を流動させることで仕上げ加工する方法を提案している．内面上にらせん状の表面突起を付与したとき，曲率を有した水管の内部流れを解析すると共に，各条件が内面性状に与える影響について調べている．実験の結果，表面突起を付加することで水管の内部流れが乱流となり，突起のない水管と比較して著しく内面性状を改善することができた．また，突起のない水管では難しかった曲線内側の面上も効率的に加工することができた．さらに，同手法が既存金型の水管面上の錆を除去することにも効果的であることがわかった．
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| 41.
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細川, 晃 ; 田中, 隆太郎 ; 古本, 達明 ; 上田, 隆司
概要:
hosokawa@se.kanazawa-u.ac.jp
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| 42.
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加藤, 寛満 ; ヘリー, モフタディ ; 山田, 啓司 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎
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| 43.
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細川, 晃 ; 上田, 隆司 ; 岡島, 厚 ; 榎本, 啓士 ; 木村, 繁男 ; 門前, 亮一 ; 野村, 明人
概要:
The activities of the problem-based learning (PBL) and their outcomes are reported here. Based on the reactions from students and faculty members to these educational programs, the advantages and improvements are also examined. A
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series of PBL subjects from 1st to 3rd grade-problem -research, problem-solving and problem-creation- are programmed according to the intelligibility and degree of advancement of students in mechanical engineering. This well-planed system makes it possible to obtain the substantial educational effects and to start smoothly the research for graduation thesis in the last 4th grade.
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| 44.
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小矢, 畑亘 ; 岡田, 将人 ; 安井, 慎之介 ; 細川, 晃 ; 田中, 隆太郎 ; 上田, 隆司
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| 45.
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福本, 陽平 ; 山田, 啓司 ; 細川, 晃 ; 上田, 隆司 ; Al, Huda Mahfudz
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| 46.
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柚木, 力 ; 細川, 晃 ; 上田, 隆司 ; 山田, 啓司 ; 田中, 隆太郎
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| 47.
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森田, 精一 ; 山田, 啓司 ; 細川, 晃 ; Al, Huda Mahfudz ; 上田, 隆司
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| 48.
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田中, 隆太郎 ; 西本, 秀人 ; 田中, 大輔 ; 古本, 達明 ; 細川, 晃 ; 上田, 隆司
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| 49.
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川村, 満彦 ; 寺田, 亮太 ; 細川, 晃 ; 上田, 隆司
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| 50.
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田中, 隆太郎 ; 鬼頭, 昂志 ; 細川, 晃 ; 古本, 達明 ; 上田, 隆司
概要:
This paper deals with the method to prevent cutting burr at face milling of stainless steels. Without laser heat treatment for workpiece, SUS304 caused largest burr height in three type stainless steels. SUS430 was easier to be
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hardened using laser heat treatment compared with SUS304 and SUS403. As for SUS304, it was possible to reduce burr height. However, it was impossible to prevention burr generation perfectly. As for SUS430 and SUS403, choosing optimum cutting conditions, it was possible to prevention burr generation perfectly. Therefore, laser heat treatment for workpiece is efficient to prevent cutting burr at face milling of stainless steels.
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| 51.
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上田, 隆司 ; 三野, 大樹 ; 古本, 達明 ; 細川, 晃 ; 長友, 正平
概要:
CO2パルスレーザを用いて単結晶のサファイアウエハの熱応力割断を試みている．レーザ割断はサファイアウエハを分断する方法として有力な加工法である．パルスレーザを用いると，割断面には単結晶ウエハに特有な縞模様が形成される．曲線割断が可能であり，
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円弧状にサファイアウエハを割断できる．ウエハ上に加工された浅い溝の上をCO2パルスレーザでなぞることによって，ウエハを割断できる．Single-crystal sapphire wafers were cleaved by irradiation with a pulsed CO2 laser. Laser cleaving is a useful method to cut sapphire wafers. A striped pattern on the cleaved surface is observed when a pulsed laser is used. Laser cleaving makes it possible to cut the sapphire along the circular arc. Sapphire wafers can be cleaved by laser irradiating along a pre-made shallow groove.
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| 52.
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田中, 隆太郎 ; 井上, 豪 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明
概要:
High coefficient of friction and wear resistance are required for a mechanical brake. Especially in a wet type brake, a
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rotor has necessary to contact with a pad directly to acquire high frictional force. This research is carried out to investigate the surface property with high friction coefficient of force in wet condition. The micro wavy and high hardness surface combined machining laser heat treated carbon steel. Laser heat treatment on the surface is undertaken by carbon dioxide laser. The characteristic of friction of this micro wavy surface is investigated to compare with the surface finished. The surface finished by cutting after laser heat treatment have higher static coefficient of friction compared with the surface finished by polishing or cutting. The smaller laser scan pitch becomes, the larger static coefficient of friction is obtained. When the angle between friction direction and laser scan direction is 45°, the largest static coefficient of friction is obtained.
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| 53.
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細川, 晃 ; 鈴木, 康昌 ; 田中, 隆太郎 ; 古本, 達明 ; 上田, 隆司
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| 54.
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岡田, 将人 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎
概要:
The cutting performance of indexable insert drill that has non-axisymmetrical geometry for drilling of difficult-to-cut
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materials is investigated. A twisted drill is also used to compare the cutting performance. The cutting characteristics are evaluated by tool flank temperature at peripheral corner edge θα, thrust force Ft, chip geometry and surface roughness Ra. The temperature of cutting tool is measured using a two-color pyrometer with an optical fiber. As work materials, the carbon steel, stainless steel, titanium alloy and nickel-base alloy are used. The θα and Ft of indexable insert drill are lower than that of solid drill in cutting of titanium alloy and nickel-base alloy. In the case of titanium alloy, the Ft of indexable insert drill is only 40% in the case of solid drill. On the other hand, this tendency reversed for stainless steel, and θα and Ft of indexable insert drill become higher than that of solid drill. The chip geometry by indexable insert drill is divided into parts in fragments so that there is chip breaker on the rake face of insert while the chip geometry by solid drill is continuous and long. The difference of surface roughness by the indexable insert drill and solid drill is negligible in the cutting of difficult-to-cut materials.
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| 55.
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田中, 隆太郎 ; 上田, 隆司 ; 細川, 晃 ; 林, 勇伝 ; 山田, 啓司
概要:
This study deals with the machinability of steels after heat treatment with CO2, laser using h-BN powder and blast furna
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ce slug as absorbent. h-BN is well known as solid lubricant. As for blast furnace slug, its composition is similar to that of inclusions in calcium dioxide steel that shows good machinability. The absorbance of slug and h-BN were more than 80%, so it is said that these powders can be used as absorbent for CO2, laser. Only in the case of h-BN, absorbent was melted into substrate and its depth was about 200 μm. When turning the steels after laser heat treatment using h-BN power and blast furnace slug as absorbent, carbide tool showed smaller tool wear than the case of carbon type absorbent. In the profile of the machined surface, there was a wave of about 5 μm in amplitude and its wavelength was equal to the feed rate of laser in heat treatment. This is because the workpiece surface after laser heat treatment has a periodic distribution in hardness. The hardness in the surface layer of workpiece was higher than that of the substrate.
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| 56.
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野崎, 隆太郎 ; Al, Huda Mahfudz ; 上田, 隆司 ; 加藤, 賢一 ; 山田, 啓司 ; 細川, 晃
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| 57.
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岡田, 将人 ; 細川, 晃 ; 田中, 隆太郎 ; 上田, 隆司
概要:
The cutting performance of some coated carbide tools in hardmilling of hardened steel is investigated. The cutting chara
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cteristics are mainly evaluated by tool wear and temperature at flank face for four types of coating films on two types of base materials. Cutting force and surface roughness are also examined. The temperature of cutting tool is measured using a two-color pyrometer with an optical fiber. The tool flank wear becomes large in the case of TiN and TiCN coated tools. The tool flank temperature increases with the increase of surface roughness of coated film, and reaches approximately 500°C for TiAlN/ AlCrN coated tool. On the other hand, the cutting forces do not change so much with surface roughness of coated film. In the case of P30-grade cemented carbide as base material, tool flank wear and flank temperature become large compared with K10- grade. The surface roughness of workpiece increases with the increase in tool flank temperature more than approximately 530°C.
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| 58.
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山田, 啓司 ; 西岡, 真吾 ; 細川, 晃 ; 上田, 隆司
概要:
Laser cleaving process is a prospective technique to divide a thin plate of brittle materials into small pieces, because of its high yield ratio and controllability. In addition, the process is carried out without coolant which
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causes the environmental pollution and the contamination of the electrical devices etched on the wafer. In this paper, laser cleaving of silicon wafer is conducted with pulsed Nd: YAG laser. The temperature of laser spot is measured by means of the two-color pyrometer with optical fiber and the acoustic emission caused by crack propagation is also observed. When the laser spot is scanned at the appropriate interval and velocity, the crack propagates in sequence by the corresponding laser irradiation. As a result, both high linearity of cleaved edge and fine fractured surface roughness are obtained. The thermal stress distribution induced by laser irradiation is analysed with FEM model, in which the stress intensity factor is calculated at the vicinity of the crack tip in order to clarify the criterion of crack propagation. The analysis and experiments reveal that the maximum tensile stress at the crack tip increases with temperature and the crack propagates when the stress intensity factor reaches the fracture toughness of the material.
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| 59.
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細川, 晃 ; 周, 智鵬 ; 山田, 啓司 ; 上田, 隆司
概要:
A new three-color infrared radiation pyrometer using an optical fiber is developed for measuring cutting temperature in
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high speed machining by small ball end mill. The high speed air spindle unit is adopted to the ordinary milling machine so that the maximum spindle revolution of 40000rpm is attainable. The ball radius of the carbide cutter is 3mm and the side cutting of carbon steel with ballnose is executed without cutting fluid. Cutting temperature distribution along the ball-nosed cutting-edge is measured. The influences of spindle rotational speed, radial depth of cut and feed per tooth on the temperature distribution at the flank face are examined. The maximum temperature of peripheral cutting edge about 700°C is obtained even at the rotation angle of 180° after cutting, and it drops along the ballnose toward the ball tip. Relatively large temperature gradient arises along the ball cutting-edge at higher spindle revolution because cutting speed depends on the local tool radius. Depth of cut and feed per tooth, at the same time, affect the overall temperature at the ball cutting edges. The cooling characteristics in air cutting reveals that the temperature difference during one cycle of intermittent cutting increases as spindle speed decreases. The relationship between the peripheral cutting speed and the tool temperature varies from tool shank to ball tip because the interactions between cutting edge and workpiece change along the ballnose.
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| 60.
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千徳, 英介 ; 上田, 隆司 ; 山田, 啓司 ; 細川, 晃
概要:
Laser forming of a sheet metal is the bending process caused by the thermal stresses which is produced in the sheet by l
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aser irradiation. Therefore, the temperature distribution in the sheet irradiated with laser beam is one of important factors to determine the bending angle of the sheet. In this study, the influence of temperature distribution and the experimental conditions like the diameter of laser beam and the thickness of a sheet on the bending angle is investigated experimentally. The temperatures of a surface irradiated with CO2 laser and its opposite surface are measured using an infrared radiation pyrometer with an optical fiber. As a result, the bending angle is directly proportional to the temperature Ts at the sheet surface irradiated with laser beam and the beam diameter D, and inversely proportional to the thickness h of the sheet. A parameter indicated by D1.41Ts1.5/h1.7 has high correlation with the all bending angles obtained under various experimental conditions. 様々な加工条件で板材のフォーミング加工を行い, 同時にレーザ照射部表面および裏面温度を測定し, 加工条件と照射温度の変形角への影響を調べた. その結果, 変形角はレーザビーム径の1.4乗に比例し, 照射温度の1.5乗に比例し, 加工物の板厚の1.7乗に反比例しており, これらの結果より導出した式は定性的に加工条件の変形角への影響を良く表している.
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| 61.
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田中, 隆太郎 ; 山根, 八洲男 ; 岡田, 将人 ; 細川, 晃 ; 上田, 隆司
概要:
This paper deals with the machinability of BN added Steels in end milling. The cutting tests were carried out by end mil
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ling carbon steel JIS S45C, S55C and these BN added steels with carbide tool and TiAlN coated carbide tool. Tool wear, cutting temperature, and, surface roughness were measured and discussed. In end milling BN added steel with square end mill, the progress rate of flank wear width was decreased and fracture at corner was suppressed in comparison with that in machining standard steel. In case of ball end mill, flank wear in end milling BN added steels were smaller in comparison with standard steel. In case of S45C, boundary wear was observed, however it was not observed in end milling BN added steel. BN added showed almost the same surface roughness as standard steel. The temperature of flank wear part in turning work based S55C were 50 °C higher in comparison with S45C base work. The temperature of throw away end mill was higher 100°C in comparison with solid square end mill. There were not significant difference between the temperature in end milling standard steel and BN added steels.
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| 62.
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山田, 啓司 ; 森田, 精一 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎
概要:
In this paper, a refrigerating chuck system is developed to reduce the thermal damages of workpiece in laser cleaving process. The system reduces the surface temperature of table below the freezing point of water, and the work material is
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fixed on the table by the frozen water between the material and the table. The cooling capability of the system is investigated. The system is applied to the laser cleaving process of silicon wafer with cw-Nd:YAG laser. The laser cleaving experiment of silicon wafer is conducted with Nd:YAG laser, then the width of thermal affected zone on the irradiated surface, the roughness of fractured surface and the deviation of cleaving trajectory are measured. The silicon oxide is caused on the surface of wafer in the room temperature, but the refrigerating chuck can prevent the thermal damage and improve the reliability of the cleaving process. By use of the chuck, the smooth fractured surface is achieved and the linearity of the cleaving trajectory is also improved.
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| 63.
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田中, 隆太郎 ; 林, 勇伝 ; 田邉, 一真 ; 上田, 隆司 ; 細川, 晃
概要:
This study deals with the trial for improvement of chip controllability in turning with selective laser heat treatment for workpiece. Selective heat treatment for carbon steel JIS S45C was carried out with Nd:YAG laser which
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could be transmitted through an optical fiber and shows higher absorption rate against carbon steels than CO2 laser. In turning of these selective laser heat threatened carbon steel, the chip form changed regular curl from irregular curl and chip breakability was improved compared with non-laser treated carbon steel. Surface roughness was obviously smaller comparing with non-laser treated carbon steel. Especially in the case that the depth of cut was larger, the surface roughness was smaller. As for cutting force, the principal force was slightly smaller, but the thrust force and feed force were almost the same. The cutting temperature was slightly lower. The tool wear was almost same as that in the case of non-laser treated carbon steel.
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| 64.
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山田, 啓司 ; Hery, Mochtady ; 平出, 寛明 ; 細川, 晃 ; 上田, 隆司
概要:
Microlens is a key component in the fields of optical communication, data storage and digital display. Integration of microlenses and optical devices is also required for weight saving, reduction in assembly cost and higher accurate
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alignment. This paper deals with the development of a novel method to fabricate spherical microlenses and microlens arrays. In this method, microlenses are formed on the surface of acrylate resin which is used as sealing material for the optical devices such as photodetectors, laser diodes, CCD image sensors and so on. Microlenses are fabricated under several conditions, and the influences of process parameters on the dimension of microlenses are investigated. The fabricated microlens and microlens array have the appropriate shape, surface finish and alignment so as to condense light.
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| 65.
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上田, 隆司 ; 山田, 啓司 ; 及川, 志郎 ; 細川, 晃
概要:
Laser forming is the thermal process to deform a metal plate using the thermal stress produced by the rapid heating with the laser. In this study, the influence of irradiating conditions of CO2 laser on the bending angle of the
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workpiece is investigated. The temperature at the back surface of the workpiece irradiated with CO2 laser is measured using a two-color pyrometer with an optical fiber. The temperature distribution in the workpiece is calculated using the FEM thermal analysis. Simple bending experiments with one-way laser scanning are carried out. Stainless steel SUS304 of various thickness is used as work material. The results obtained are as follows. The bending angle is proportional to the temperature of the workpiece irradiated. The temperature of workpiece increases with the increase of laser power, the decrease of feed rate of the laser beam and the decrease of plate thickness. After all, the bending angle becomes larger with the increase of laser power, the decrease of the feed rate and the decrease of the thickness of the plate. The temperature of the workpiece can be used as a signal to control the deformation of the workpiece.
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| 66.
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千徳, 英介 ; 上田, 隆司 ; 細川, 晃
概要:
Laser leveling is an application of laser forming. Laser leveling of a sheet metal is a plastic process caused by therma
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l stresses which are produced in the sheet by laser irradiation. In this paper, a sphereical distortion on a sheet metal is leveled by laser irradiation. As a model of a circular distortion, the dsitortion is intentionally introduced on the sheet metal by pressing a steel ball of 25 mm radius against it. As work materials, steel sheet and stainless steel sheet whose thickness is 0.6mm are used. Laser beam is radially irradiated at the center of circular distortion for leveling the distorted sheet metal. Continuous CO2 laser beam is used and its power is changed at the range of 80W ∼ 200W under a constant scanning speed of 2mm/s. After laser irradiation, a distortion of about 400µm hight becomes almost flat without melting a sheet metal.
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| 67.
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嶋村, 公二 ; 細川, 晃 ; 上田, 隆司 ; 政, 誠一
概要:
The UBMS (UnBalanced Magnetron Sputtering) method is applied to the coated end mills and some kinds of such tools are used in high-speed milling of SUS304. This coating film is designed to improve lubricating ability rather than heat
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resistance. TiCN film deposited by UBMS method (U-TiCN) has smooth surface and low coefficient of friction. XPS analysis reveals that the U-TiCN film includes many free carbons rather than carbide phases, and this structure acts as lubricant as well as thermoprotective film. Long tool life and good finished surface quality are obtained with U-TiCN coated end mills than standard commercially available coated end mills in high-speed side milling without coolant. An U-TiCN end mills having a low coefficient of friction suppress adhesion of workpiece material and overlap of chips to the cutting edge.
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| 68.
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古本, 達明 ; 上田, 隆司 ; 小林, 直人 ; 細川, 晃 ; 田中, 隆太郎 ; 阿部, 諭
概要:
The consolidation characteristics of ferrous based powder for Selective Laser Sintering (SLS) and Selective Laser Melting (SLM) are described. Yb : fiber laser beam is applied to obtained the high quality layered structure. In order
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to investigate the influence of laser conditions on consolidation quality of the layered structure, the maximum temperature at irradiation area of a laser beam is measured with a two-color pyrometer. In addition, the cross section of layered structure and the specific cutting force with dynamometer is evaluated for the optimization of the quality of consolidated structure. The result shows that the consolidated structure was changed with the energy density and the time interval of the laser beam scan. The maximum temperature during laser irradiation was not influenced by the previous laser beam scan when the time interval between the laser beam scan is over 50ms. The pore on the consolidated structure decreased with the increase of energy density, however superfluous supply of energy density caused the precipitation of carbon from the ferrous powder. The specific cutting force of the consolidated structure was greatly related to the ratio of consolidation.
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| 69.
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論文
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山田, 啓司 ; 大礒, 桂一 ; 細川, 晃 ; 上田, 隆司
概要:
The thermal stress cleaving of silicon wafer with a laser beam is a prospective technique, which supersedes the mechanical dicing. This method makes it possible to cut a wafer at very high production rate in comparison with the diamond thin
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blade wheel and to protect the wafer from the contamination of cutting coolant and chips. In this paper, the cleaving mechanism of silicon wafer irradiated with the pulsed Nd:YAG laser is investigated. The temperature at the area irradiated with laser is measured using two-color pyrometer with an optical fiber. The acoustic emission is also measured to examine the mechanism of the crack propagation. In the process, the temperature at the area irradiated with laser should be controlled in order to reduce the thermal damages and to improve the cleaving accuracy.
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| 70.
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細川, 晃 ; 織田, 正人 ; 眞下, 和史 ; 佐久間, 邦郎 ; 山田, 啓司 ; 上田, 隆司
概要:
In this study, a new technique of in-process evaluation of the wheel surface is proposed. Five specified wheel surfaces are prepared as the references via the appropriate dressing procedure, and grinding sounds generated by these wheels
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are discrimi-nated by analyzing the dynamic frequency spectrum with a neural network technique. In the case of conventional vitrified-bonded alumina wheel, grinding sound can be identified under the optimum network configuration in such that learning rate is 0.0029 and number of hidden layer is 420. This system can recognize instantaneously the difference of the wheel surface in a good degree of accuracy insofar as the dressing conditions are relatively widely changed. In addition, the network perceives the wheel wear because the grain tips are flattened as grinding proceeds and the grinding sound resembles to that of the wheel generated with lower dressing feed.
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| 71.
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山田, 啓司 ; 加藤, 寛満 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎
概要:
Micro machining of single-crystalline silicon is performed with the second-harmonic of Nd:YAG laser in this study. In experiments, various shapes of plastic microlens are fabricated on a transparent substrate by the developed
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die-less method. These microlenses are shaped by thermal deformation induced by the Er:YAG laser beam absorbable for the acrylate resin. And then, these lenses are used as optical devices to generate the local high energy density desired for machining of silicon in air and water. Machining characteristics are investigated in the single groove machining process, and the grid groove pattern and the herringbone pattern are formed to demonstrate the feasibility of proposed methods.
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| 72.
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山田, 啓司 ; 上田, 隆司 ; 堀居, 直幸 ; 細川, 晃 ; 田中, 隆太郎
概要:
Water spraying is usually used in the removal of hard dental tissue with laser for the clinical cavity preparation which is previous to the prosthesis. However, the effect of water on the dental tissue irradiated with laser has not
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been evaluated quantitatively. In this paper, the cavity preparation is performed for human dentin tissue with Nd:YAG laser and Er:YAG laser to investigate the effects of water. The thermal damages caused on dentin tissue are microscopically observed and the perforatability is evaluated from the dimensions of cavity perforated. The thermal damages caused on dentin tissue is reduced by water, especially very fine cavity can be achieved in the cavity preparation with Er:YAG laser, while the perforatability with laser beam is decreased by water. The audible sound pressure level is also measured to investigate the feasibility of sound monitoring as the removal-monitoring method. It is found that the sound pressure level increases linearly with the extent of removed dental tissue.
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| 73.
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上田, 隆司 ; 荻野, 健太郎 ; 山田, 啓司 ; 細川, 晃 ; 佐藤, 昌彦
概要:
The water-solution type coolant is used instead of ordinary. oil type coolant and the effect of the coolant on the finishing is investigated experimentally. As work materials, titanium, titanium alloies and Ni-based alloy are used.
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Electrolytic in-process dressing is employed to promote the ability of metal removal because the water-solution type coolant is inferior to that of oil type one in the permeability. The specific cutting energy k s of these materials are compared with k s of a bearing steel in order to evaluate the machinability of the work materials. The results obtained are as follows. The superfinishing opera-tion using a water-solution type coolant is the effective method to finish the surface of these difficult-to-cut materials when the electrolytic in-process dressing is applied together. The suitable conditions in electrolytic dressing for each work material are obtained, and the titanium which has the highest adhesive property needs the strongest electrolysis among the work materials used in this study. The electrolytic-in-process dressing makes it possible to maintain the cutting ability of the finer grain size stone for a long time, and to obtain the mirror surface of Incoloy 800 with #8000 SD diamond stone.
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| 74.
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古本, 達明 ; 上田, 隆司 ; 細川, 晃 ; 阿部, 諭 ; Childs, Tomas H.C.
概要:
In this paper, a simple method for the measurement of thermal conductivity and absorption of laser beam in fine metal po
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wder for rapid prototyping is proposed. When the heating time of the metal powder t is sufficiently short in comparison with the time until the metal powder reaches its maximum temperature T (t/T<0.1), and the measurement depth from a surface Z is longer than the diameter of the heat source a (Z/a>1.23), it is shown that the thermal conductivity of a metal powder can be precisely calculated by measuring the time that the temperature takes to reach its maximum value. As work materials, chromium molybdenum steel powder (SCM) and copper powder, whose diameters are 10μm, 20μm and 30μm, are used. As a result of measuring the thermal conductivity and the absorption of laser beam in various metal powders, the thermal conductivity of a metal powder is quite small compared with that of the metal, and the materials, the shapes and the diameter of a metal powder have little influence on thermal conductivity. The absorption at the surface of a metal powder is larger than that of the metal, and there is little difference among the materials.
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| 75.
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細川, 晃 ; 岡田, 将人 ; 北川, 修介 ; 田中, 隆太郎 ; 上田, 隆司
概要:
The cutting performance of cBN tools for high-speed end milling of hardened steel is investigated. The cutting character
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istics are evaluated by tool temperature at the flank face, cutting force, chip geometry and surface roughness at the change of cutting speed ν and workpiece hardness. The temperature of cutting tool is measured using a two-color pyrometer with an optical fiber. The tool flank temperature θα increases with the increase of cutting speed and workpiece hardness, and reaches approximately 850°C at ν=600 m/min and HRC60. In particular, the workpiece hardness has great influence on the tool flank temperature. On the other hand, the principal cutting forces does not change so much with workpiece hardness. Based on the chip geometry measured, the most likely explanation for these phenomena is that chip formation process changes with workpiece hardness. As the workpiece hardness increases, the cutting actions become stable so that the surface roughness decreases. In the case of the low cBN content tool, tool flank temperature increases by 20∼50°C or more than high content one, because of the low thermal conductivity.
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| 76.
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上田, 隆司 ; 山田, 啓司 ; 篠崎, 道 ; 細川, 晃
概要:
Perforatability and thermal damages of dental hard tissues with two kinds of YAG laser are investigated for the purpose of making the cavity and forming the abutment tooth. The perforatability of dentin with laser beam depends on the
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absorptivity for laser beam, the laser power, the pulse duration and the number of laser pulses. Approximately 65% of Er:YAG laser beam is absorbed at irradiated surface of dentin, but the absorptivity for Nd:YAG laser beam is only 17%. High perforatability is accomplished using Er:YAG laser because of its higher absorptivity. There is a linear relation between the perforated depth and the number of pulses. Higher laser power and larger pulse duration improve the perforatability, in the same time, induce thermal damages on dental hard tissue such as thermal cracks and burning of dentin. Lower laser power and smaller pulse duration makes it possible to make fine cavities without thermal cracks and burning in even with Nd:YAG laser.
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| 77.
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細川, 晃 ; 小澤, 匡史 ; 田中, 隆太郎 ; 古本, 達明 ; 上田, 隆司
概要:
In this paper, the MQL turning of two types of ferrous metals: chromium-molybdenum steel SCM440H and pearlite malleable
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cast iron FCMP: is dealt with. The appropriate generating system of oil mist is constructed and the specified turning tool with oil hole is used. In order to verify the cooling effect of MQL, the tool temperature at the flank face is measured using a newly assembled fiber-coupled two-color pyrometer. In this new technique, a sensing fiber is inserted into a small hole that extends to the outer surface of the tubelike workpiece and it rotates with the workpiece. The thermal radiation accepted by a sensing fiber is noncontactly transmitted to the other fixed fiber and led to the two-color detectors. As for cutting force in turning of SCM440H, MQL is more effective in low cutting speed below 100 m/min. The tool temperature in MQL turning is approximately 100°C lower than that in dry turning over the wide range of 30∼300 m/min. In the case of FCMP, the tool temperature in dry turning at a cutting speed of 600 m/min reaches as much as about 1040°C, but it drops 920°C in MQL turning.
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| 78.
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細川, 晃 ; 小田, 健作 ; 山田, 啓司 ; 上田, 隆司
概要:
The temperature of cutting tool in high speed endmilling is measured using a two-color pyrometer with an optical fiber.
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This pyrometer has a flat response for the square-wave signal up to approximately 400kHz, which is enough speed to measure the temperature of an endmilling cutter passing at a cutting speed of 628m/min. The influence of cutting speed v and feed per tooth f on the cutting temperature at the flank face of the cemented carbide insert is investigated. The heating and cooling characteristics of the cutting tool during an intermittent cutting cycle are also examined. In dry cutting of carbon steel, the cutting tool temperature θα rises rapidly with the increase of cutting speed and θα reaches approximately 770°C at v=628m/min. The feed per tooth, however, has less effect on cutting tool temperature. The temperature change during an intermittent cutting process is about 150°C when v=471.2m/min and f=0.047mm/tooth. The temperature distribution along the contact edge between a tool and workpiece is almost uniform although those at tool tip and boundary region are somewhat higher.
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| 79.
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上田, 隆司 ; 田中, 邦茂 ; 西岡, 真吾 ; 山田, 啓司 ; 細川, 晃
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| 80.
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細川, 晃 ; 三嶋, 啓太 ; 古本, 達明 ; 小谷野, 智広
概要:
本研究は少量の研削液で効果的に研削熱の発生を抑制する手法を構築することを目的とし，研削液の砥石作業面への供給の妨げとなっているエアベルト（砥石連れ回り空気流）を効果的に抑制する方法について検討している．すなわち，砥石作業面に接触させたブラシ
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を介してクーラントを供給する方法を提案し，本手法の有効性を研削抵抗や仕上げ面性状などから検証している． This study deals with the reduction of coolant in cylindrical plunge grinding. A brush-nozzle is placed in order to block ′air-belt′ which is boundary layer on the wheel surface, and it helps the coolant adhere to the wheel surface. This study confirms that the quantity of coolant can be reduced from 10 l/min to 0.4 l/min by using the brush-nozzle. In addition, the brush-nozzle is effective in reducing grinding force and generation of smooth ground surface.
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| 81.
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上原, 祐也 ; 細川, 晃 ; 上田, 隆司 ; 田中, 隆太郎 ; 古本, 達明 ; 秀田, 守弘
概要:
円形工具を回転させながら旋削を行うスピニングツール(ADRT)では，切れ刃が加熱(切削時)と冷却(空転時)を繰り返すため熱負荷が軽減され，難削材旋削において工具寿命の増大が期待される．前報ではSUS304を対象に，主として工具の回転速度が工
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具の加熱-冷却特性に及ぼす影響について検討した．本報では，代表的な高硬度耐熱合金であるインコネル718を旋削し，工具温度および工具損耗形態からスピニングツールの有効性について検討している． The cutting characteristics of the actively driven rotary lathe tool are investigated from the viewpoint of thermal aspects. The MQL external turning tests of heat-resistant Ni-based alloy (Inconel718) are carried out, in which the cutting temperature is measured using a fiber-coupled two-color pyrometer. The maximum tool temperature in turning of Inconel718 is approximately 100 degree higher than that in SUS304. The relatively lower temperatures are obtained at the appropriate tool revolution speed.
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| 82.
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辺見, 慎吾 ; 古本, 達明 ; 細川, 晃 ; 小谷野, 智広 ; 上田, 隆司
概要:
Many methods for dental treatment using heat produced by laser irradiation have been developed. It is necessary to deter
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mine the surface temperature of the laser-irradiated area to elucidate the mechanism of enamel removal by laser irradiation. In this study, the surface temperature of human enamel during CO2 laser irradiation was measured by two-color pyrometry. In addition, acoustic emission occurring inside the tooth during laser irradiation was also measured. The results indicated that the surface temperature increased with increasing laser energy. In addition, acoustic emission occurred when the enamel surface was removed, and the removal volume increased with increasing number of acoustic emission signals. 歯科医療の分野では，主にレーザ照射に起因して生じる熱を利用して歯質除去などの治療が行われる．そのため，レーザ照射による歯質の除去メカ二ズムを解明する上で，照射部の温度は重要な要素である．本研究では，ファイバ導光型赤外線輻射温度計を用いて，CO2レーザ照射中のエナメル質表面温度を測定した．また，エナメル質内部に発生するAE波を同時に測定し，温度と併せてエナメル質の除去機構を検討した．その結果，エナメル質表面の温度はレーザエネルギの増加にともない上昇した．また，エナメル質の除去に対応してAE波が発生し，AE波の発生回数が増えると除去体積が線形的に増加することがわかった．
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| 83.
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細川, 晃 ; 安井, 平司 ; 樋口, 浩司 ; 佐藤, 郁
概要:
This report deals with the grinding heat partition into workpiece for two kinds of fine ceramics-normally sintered silicon carbide (SSC) and normally sintered silicon nitride (SSN)-in wet grinding. Based on a simple model of heat transfer
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in wet grinding in such that some portions of the total grinding energy (=q) is conducted into workpiece as heat (=qw) and part of qw flows into grinding fluid by convection (=qf) through the ground surface in the wheel-work interference zone, the heat partition into workpiece Rw is calculated. The heat partition of SSC is not affected so much by both table speed and wheel depth of cut with water-based grinding fluid. In the case of SSN, on the other hand, Rw increases from approximately 5% to 35% as table speed increases from 0.2 to 15 m/min. At lower table speed below approximately 1 m/min, however, the heat partitions are little influenced by table speed, in which the fragmented finished surface like SSC is dominant. The abrasive-workpiece interaction of SSN is affected by the grinding zone temperature, so that the surface morphology varies with grinding conditions as well as grinding heat partitions under the conventional grinding conditions.
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| 84.
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廣瀬, 直也 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明 ; 小谷野, 智広
概要:
CFRP(Carbon Fiber Reinforced Plastic)はその高強度さ故に工具摩耗が著しく，現在は主としてダイヤモンドコーティング工具が用いられている．本研究では，ダイヤモンドに比べて安価なDLC(Diamond Like
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Carbon)コーティングエンドミルを用い，切れ刃への負荷が小さい強ねじれエンドミルによる傾斜切削の有効性を検討している．実験はDLC膜厚が仕上げ面性状に及ぼす影響をダイヤモンドコーティングエンドミルと比較しながら検討している．
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| 85.
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村松, 健吾 ; 源濟, 優輔 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明 ; 秀田, 守弘
概要:
円形工具を回転させながら旋削を行うスピニングツール(ADRT)では，切れ刃が加熱(切削時)と冷却(空転時)を繰り返すため熱負荷が軽減され，難削材旋削において工具寿命の増大が期待される．本報ではより冷却性に富む水溶性ミストの効果を検証するとと
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もに，最適な工具回転速度を切削温度，切削抵抗，工具摩耗，工作物仕上げ面性状などから総合的に検討している． The cutting characteristics of the actively driven rotary lathe tool are investigated. The MQL external turning tests of SUS 304 and Inconel718 are carried out with some kinds of cutting fluids, in which the effect of water soluble oil on tool temperature and tool wear are mainly examined. The optimum toll rotational speed is also investigated based on both tool temperature and cutting forces.
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| 86.
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鈴木, 翔大 ; 小谷野, 智広 ; 細川, 晃 ; 古本, 達明
概要:
放電加工では，加工液が気化して生成した気泡が，連続放電中の極間の多くを占めることが知られている．この気泡は放電ごとの極間の冷却を妨げ，加工の安定を損なっている可能性がある．そこで，本研究では加工液を大気圧以上に加圧する加圧放電加工法を開発し
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，気泡体積の減少による加工特性の向上を図っている．本報では，単発放電時の気泡挙動を電極側面から観察し，圧力が気泡挙動に与える影響を調査した結果を述べる．
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| 87.
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岡田, 将人 ; 上田, 隆司 ; 細川, 晃
概要:
炭素鋼の穴あけ加工に刃先交換式ドリルを用いた場合の切削特性について，一般的なソリッドドリルと比較して検討した．加えて，MQLによる切削特性への影響を比較した．刃先交換式ドリルはソリッドドリルに比べ，工具温度が高く，仕上げ面性状は劣るが，スラ
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スト力は低い．刃先交換式ドリルによる切りくずは，チップブレーカにより細分化され排出された．オイルミストを供給することで，ソリッドドリルの場合よりも工具温度の低減効果が得られた．
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| 88.
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西本, 秀人 ; 田中, 隆太郎 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明
概要:
本研究では湿式切削における2色温度計を用いた工具刃先温度の測定方法を提案する．光ファイバを挿入した小孔からエアを供給することでクーラントが光ファイバ端面へ付着することを防ぎ，湿式切削における温度測定が可能となる．この方法によってダイヤモンド
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焼結体工具およびCBN焼結体工具を用いたチタン合金の湿式切削において，工具刃先温度の測定を行った． In this study, the method of tool edge temperature using two-color pyrometer in wet cutting is proposed. Using this method, the high pressure air supplied from small hole for an optical fiber prevents coolant from adhering to the optical fiber edge and makes temperature measuring possible. Air pressure never affects tool edge temperature measured using two-color pyrometer. In this way, the tool edge temperature of CBN and Poly Crystalline Diamond (PCD) tool is measured in turning of Ti-6Al-4V. As a result, the tool edge temperature is increases rapidly with the increase of cutting speed. In dry turning of Ti-6Al-4V, PCD tool edge temperature is almost 100oC lower compared with CBN tool edge temperature. Supplying coolant, CBN tool edge temperature is reduced about 70 oC and PCD tool edge temperature is reduced about 340 oC compared with tool edge in dry turning resistivity.
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| 89.
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細川, 晃 ; 安井, 平司 ; 永江, 昌義 ; 佐藤, 郁
概要:
This study deals with the post-process measurement of the grinding wheel topography by means of a newly improved image processing system. In this system, grinding wheel is driven by the high-power electric servomotor with a built-in
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rotary encoder so that both grinding operation and consecutive measurement of the individual abrasive grains by the accurate wheel positioning are possible. The contraction/expansion process is useful for the separation of adjacent grains. The dark field microscopy is effective in order to extract monochromatic CBN grains from the lustrous metal bond. This system is applicable to the practical grinding operation with resinoid and metal bonded superabrasive wheels with a good degree of accuracy and efficiency. In grinding normally sintered silicon nitride with the resinoid-bonded diamond wheel at a given grinding condi-tion, this system reveals that cutting-edge ratio decreases rapidly due to the micro-fracture of grain tips at the transient stage just after truing/dressing, and it increases slightly with the promotion of attritious wear under the successive steady state. This phenomena are explained by the fact that abrasive grains are damaged during truing/dressing operation.
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| 90.
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古本, 達明 ; 上田, 隆司 ; 細川, 晃 ; Abdullah, Yassin ; 阿部, 諭
概要:
金沢大学理工研究域 機械工学系<br />In order to manufacture the part of a small lot at lower cost and shorter lead-time, various techni
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ques, such as a rapid tooling, reverse engineering and high speed milling, are proposed. Recently, milling-combined laser metal sintering system, which is the device of sintering the metal powder and milling the sintered metal with end mill at the one process, has been developed to produce the injection molding dies. In this report, the sintering characteristics of the metal powder used for rapid tooling with Yb fiber laser are described. Relationship between the scanning speed of laser beam and the width of sintered material on the different surface plate are investigated. Moreover, the cross section of sintered material is analyzed with EPMA and cutting force is measured by the dynamometer in the various conditions. As a result, it was shown that the suitable irradiation energy for laser sintering should be selected to obtain the good shaped structure, which is occurred the melting, the cohesion and the solidification of the metal powder repeatedly. The shape of sintered material is formed like a spherical in the conditions of too much energy supply, and not formed partially in the conditions of a little energy supply. The melted metal powder with the generated heat by laser irradiation alloyed with the plate surface on the process of the solidification. The specific cutting force of sintered material on the surface with sandblast is quite larger than that on the standard surface by the difference of the wetting of melted metal powder.
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| 91.
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古本, 達明 ; 上田, 隆司 ; 青木, 慎太郎 ; 葛西, 惇士 ; 細川, 晃 ; 立矢, 宏
概要:
金沢大学理工研究域機械工学系<br />In this paper, a measurement of the impulse stress induced by a laser irradiation on the extracted h
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uman enamel was proposed. The dynamic load induced in the specimen by using elastic wave propagation in the long bar made of aluminum alloy was measured. The human enamel was grinded with the grain of # 600, and fixed on the edge of the long bar. The titanium dioxide powder whose average diameter is 1 urn was applied to the enamel surface so as to absorb the irradiation laser beam effectively. The laser induced stress intensity was evaluated from the dynamic strain measured by small semiconductor strain gauges attached on the long bar. As a result, the impulse stress induced on the human enamel increased with increasing the laser energy, and related to the volume of the prepared cavity. The laser induced stress for the removal of the unit volume of human enamel was 0.03 Pa/mm<sup>3</sup>.
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| 92.
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細川, 晃 ; 上田, 隆司 ; 榎本, 啓士 ; 木村, 繁男 ; 岡島, 厚
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| 93.
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嵐, 知哉 ; 古本, 達明 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎
概要:
金沢大学理工研究域機械工学系
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| 94.
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嶋村, 公二 ; 細川, 晃 ; 上田, 隆司 ; 政, 誠一
概要:
The TiCN coating film containing free carbon deposited by UBMS (U-TiCN) is applied to the end mills and some kinds of su
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ch tools are used in high-speed milling of SUS304. This coating film is designed to improve lubricating ability rather than heat resistance. U-TiCN coating film including many free carbons has smooth surface and low coefficient of friction. Following the 1st report, film properties and cutting temperature of U-TiCN coating film are examined. U-TiCN oxidizes at 500°C lower than TiN and TiAlN. FE-TEM (Field Emission Scanning Electron Microscope) analysis reveals that the U-TiCN coating film forms the fine crystallization rather than generally TiCN coating film without free carbons. Lower cutting temperature is obtained with these U-type TiCN-coated tools than the ordinary AIP-coated tools in high-speed side milling without coolant.
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| 95.
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嶋村, 公二 ; 細川, 晃 ; 上田, 隆司 ; 政, 誠一
概要:
The UBMS (UnBalanced Magnetron Sputtering) method is applied to the coated end mills and some kinds of such tools are used in high-speed milling of SUS304. This coating film is designed to improve lubricating ability rather than heat
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resistance. TiCN film deposited by UBMS method (U-TiCN) has smooth surface and low coefficient of friction. XPS analysis reveals that the U-TiCN film includes many free carbons rather than carbide phases, and this structure acts as lubricant as well as thermoprotective film. Long tool life and good finished surface quality are obtained with U-TiCN coated end mills than standard commercially available coated end mills in high-speed side milling without coolant. An U-TiCN end mills having a low coefficient of friction suppress adhesion of workpiece material and overlap of chips to the cutting edge.
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| 96.
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林, 勇伝 ; 田中, 隆太郎 ; 草野, 岳彦 ; 細川, 晃 ; 上田, 隆司
概要:
本研究は，炭素鋼S45Cの旋削加工においてレーザ熱処理が切りくず処理性や仕上げ面粗さへ及ぼす影響について検討している．実用的な見地から小型の半導体レーザをCNC旋盤の刃物台に設置し，機上にて工作物長手方向にレーザを照射して選択的に熱処理を行
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っている．工具は超硬P30種とアルミナ-炭化チタン系セラミック工具を用い，すべての実験でブレーカピースを併用している．レーザ熱処理を行わない通常の旋削では低切削速度と高送りの場合にのみ切りくずが折断されるが，レーザ熱処理した炭素鋼を旋削すると広範囲の切削条件において切りくずが折断され，被削性が向上する．レーザ熱処理された炭素鋼の切りくず観察より，連続型切りくず中に変形形態が異なる部分が確認され，この部分を起点として切りくずが折断されている．このとき，超硬P30種およびセラミック工具いずれの場合においても仕上げ面粗さはレーザ照射なしの場合と比べてほとんど同じか若干傾向にあり，硬化したレーザ熱処理部を周期的に切削することによる仕上げ面の劣化は引き起こされない．
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| 97.
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田中, 隆太郎 ; 山根, 八洲男 ; 上田, 隆司 ; 細川, 晃 ; 白神, 哲夫
概要:
本報告は，BNが添加された鋼のドリル加工における被削性について述べている．穴加工は旋削加工，フライス加工とともに，切削加工の中でも大きなウェイトを占める重要な加工である．そこで，比較的新しく開発された快削鋼であるBN添加鋼についてハイスドリ
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ルを用いた穴加工を行い，標準鋼であるJIS S45Cと比較し，被削材中の化学成分が工具寿命に与える影響を調査し被削性を評価した．切削実験を行った結果，BN添加鋼は標準材と比べ長い工具寿命が得られることが明らかとなった．このことからハイスドリルによる比較的低速のドリル加工においてもBN添加鋼が優れた被削性を示すことがわかった．また，BNの添加による切削温度への影響を調べるために工具-被削材熱電対法で切削温度の測定を行った．切削温度はほぼ同程度であり，切削抵抗はわずかではあるが低い値を示すことがわかった．
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| 98.
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鬼頭, 昂志 ; 田中, 隆太郎 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明
概要:
著者らが提案した，レーザを用いた被削材の部分的熱処理によるバリの抑制方法について，より効率的なバリの抑制を実現するために，フライスカッタの出口角度，送り速度，切削速度およびレーザ照射強度が切削後の端部形状におよぼす影響を調査した．その結果，
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切削後の被削材端部の形状は，カッタ出口角度と送り速度によって定まる切取り厚さと，カッタ出口角度と切削速度によって定まる熱処理部の切削時間に依存することが明らかとなった．また，レーザ照射条件を制御して深いマルテンサイト層を生成することによって，より確実にバリの発生を抑制することができることが明らかとなった．
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| 99.
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田中, 隆太郎 ; 鬼頭, 昴志 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明
概要:
本研究では，炭素鋼の正面フライス加工において，加工能率を維持したままバリの抑制を図る手法として，レーザを用いた被削材の部分的な改質による方法について提案した．実験では炭酸ガスレーザを用いて選択的に熱処理を行った炭素鋼JIS S45Cの正面フ
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ライス加工において，切削後の被削材端部の形状についてバリの高さの測定と断面の組織観察を行い，被削材へのレーザ熱処理によるバリの抑制効果について検討を行った．切削後における被削材の端部の形状はレーザ照射条件に依存し，表層にマルテンサイト組織が生成されていると微小なコバ欠けが生じる．またマルテンサイト組織が生成されていなくても，レーザ熱処理により硬度が母材よりも高くなっていると発生するバリの高さが小さくなる．最終切取り予定線へレーザ熱処理を行えば, それ以前の切削でバリが発生していても最終切削においてバリの発生を抑制することができる．仕上げ面粗さは，レーザ熱処理の影響をほとんど受けない．
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| 100.
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小澤, 匡史 ; 細川, 晃 ; 田中, 隆太郎 ; 古本, 達明 ; 上田, 隆司
概要:
金沢大学理工研究域 機械工学系<br />本研究では，クロム-モリブデン鋼とパーライト可鍛鋳鉄を対象として，ミストホール付きMQL専用バイトを用いたMQL旋削加工を行っている．MQL専用バイトはシャンク内にインサート近傍まで２つのオイル穴を
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有しており，オイルミストをすくい面および逃げ面の両方にピンポイントで供給することができる．クロム-モリブデン鋼においては工具すくい面にオイルミストを供給することで，100.m/min以下の低切削速度域で切削抵抗が大きく減少する．一方，工具逃げ面側からのオイルミストの供給は，30~300.m/minの広範囲の切削速度域で仕上げ面粗さの改善に寄与する．工具逃げ面温度については，乾式に比べ逃げ面ノズルからのオイルミスト供給でおよそ70ºC，すくい面ノズルからの供給でおよそ30ºC低下し，同時に供給することで両者の冷却効果を加算した100ºC程度温度冷却される．
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