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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
出版情報: 精密工学会学術講演会講演論文集 = 2006 JSPE Spring Meeting.  2006 Spring  pp.1271-1272,  2006.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/00050002
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 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 続きを見る
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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
出版情報: 精密工学会学術講演会講演論文集 = 2009 JSPE Autumn Meeting.  2009 Autumn  pp.293-294,  2009.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/00050003
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 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 続きを見る
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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
出版情報: 精密工学会学術講演会講演論文集 = 2007 JSPE Autumn Meeting.  2007 Autumn  pp.495-496,  2007.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/00050008
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 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 続きを見る
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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
出版情報: 精密工学会学術講演会講演論文集 = 2007 JSPE Spring Meeting.  2007 Spring  pp.841-842,  2007.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/00050011
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 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 続きを見る
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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
出版情報: 精密工学会学術講演会講演論文集 = 2008 JSPE Spring Meeting.  2008 Spring  pp.311-312,  2008.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/00050014
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 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 続きを見る
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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
出版情報: 精密工学会学術講演会講演論文集 = 2008 JSPE Spring Meeting.  2008 Spring  pp.945-946,  2008.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/00050036
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 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 続きを見る
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古本, 達明 ; 上田, 隆司 ; 細川, 晃 ; 阿部, 諭 ; Childs, Tomas H.C.
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  73  pp.558-562,  2007-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38811
概要: In this paper, a simple method for the measurement of thermal conductivity and absorption of laser beam in fine metal po 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. 続きを見る
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細川, 晃 ; 小澤, 匡史 ; 田中, 隆太郎 ; 古本, 達明 ; 上田, 隆司
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  74  pp.1080-1085,  2008-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38809
概要: In this paper, the MQL turning of two types of ferrous metals: chromium-molybdenum steel SCM440H and pearlite malleable 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. 続きを見る
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古本, 達明 ; 上田, 隆司 ; 細川, 晃 ; Abdullah, Yassin ; 阿部, 諭
出版情報: 精密工学会誌.  74  pp.836-840,  2008-08-01.  精密工学会
URL: http://hdl.handle.net/2297/12033
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 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. 続きを見る
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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
出版情報: Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C.  75  pp.2810-2815,  2009-01-01.  日本機械学会
URL: http://hdl.handle.net/2297/20333
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 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>. 続きを見る