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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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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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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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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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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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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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