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論文

論文
田中, 隆太郎 ; 林, 勇伝 ; 田邉, 一真 ; 上田, 隆司 ; 細川, 晃
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  73  pp.1025-1029,  2007-09-05.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38916
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 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. 続きを見る
2.

論文

論文
細川, 晃 ; 岡田, 将人 ; 北川, 修介 ; 田中, 隆太郎 ; 上田, 隆司
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  73  pp.226-231,  2007-02-05.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/39330
概要: The cutting performance of cBN tools for high-speed end milling of hardened steel is investigated. The cutting characteristics 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. 続きを見る
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論文

論文
渡邉, 英人 ; 岡田, 将人 ; 吉田, 昭宏 ; 古本, 達明 ; 浅川, 直紀
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  80  pp.615-616,  2014-06-05.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/43487
概要: This paper deals with the cutting mechanism against cemented carbide by using a diamond coated carbide end mill. The influence of tool wear, cutting force, and machined groove integrity on the cutting of cemented carbide was investigated experimentally. The ball end mill with a diameter of 6mm was applied under the condition of air-blow supply. As results, the coated diamond film on the rake face was immediately flaked when the grooving length was less than 20mm. However, the cutting force was decreased by flaking the coated film, and the stable cutting was achieved without any damage to the base material of ball end mill until the grooving length was 800mm. 続きを見る
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論文

論文
米山, 猛 ; 陸, 子男
出版情報: 精密工学会誌 = Journal of the Japan Society for Precision Engineering.  64  pp.598-602,  1998-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/41932
概要: As trial applications of mechanical machining for micro parts production, a micro lathe turning system has been constructed. The size of the micro cutting system is so small that the working situation must be observed under an optical microscope. Circular bar of 0.3mm in diameter is cramped and rotated with little eccentricity. Several materials such as copper, brass and Ti are cut into the minimum size of about 10 μ m in diameter. And also the influence that is given to cutting force under several cut conditions has been discussed. Especially, the influence of the depth of cut and the feed of cut on the cutting force and the specific cutting force has been investigated in the cutting process of each material. 続きを見る
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論文

論文
杉森, 博 ; 藤井, 弘之 ; 氷室, 直樹 ; 神谷, 好承
出版情報: 精密工学会学術講演会講演論文集.  2003A  pp.173-173,  2003-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/43992
概要:  小径穴のドリル加工を行うため,加工中の切削力を検出しながらその荷重をドリルの送りに反映させながら加工を行うセンサーフィードバック型のドリリングシステムの開発を行った.本システムは,従来位置制御用に多用されてきたステッピングモータを,切削力 を制御するいわゆるセンサーフィードバック型のシステムとしており,これによって穴加工精度の向上,ドリル折損の予知等について試みた. 続きを見る
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論文

論文
田中, 隆太郎 ; 山根, 八洲男 ; 上田, 隆司 ; 細川, 晃 ; 白神, 哲夫
出版情報: 砥粒加工学会誌 = Journal of the Japan Society of Grinding Engineers.  52  pp.28-33,  2008-01-01.  砥粒加工学会 = The Japan Society for Abrasive Technology
URL: http://hdl.handle.net/2297/28416
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 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. 続きを見る