Study on High-Efficiency Finish Turning of Carburized Hardened Steel with Driven Rotary Cutting
Hideharu Kato*, Tatsuya Shikimura*, Yoshitaka Morimoto*,
Kazuhiro Shintani*, Kazuyuki Kubota**, and Katsuhiro Nakagaki***
*Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan
**Hitachi Tool Engineering Ltd., 13-2 Shinizumi, Narita, Chiba 286-0825, Japan
***Takamatsu Machinery Co., Ltd., 1-8 Asahigaoka, Hakusan, Ishikawa 924-8558, Japan
Recently, cutting has replaced grinding in the finish processing of hardened steel. However, tool damage is a major problem in high-efficiency operations that use high-speed cutting and high-feed rate conditions instead of the present cutting conditions. Therefore, the examination of a new cutting technique that can realize high-efficiency cutting is desired. In this study, the effects and efficiency of driven rotary cutting are investigated in the finish turning of carburized hardened steel. Based on the results, flaking occurs when single-point turning is used at the cutting edge at a short cutting length of 0.2 km. On the other hand, even if the cutting length amounts to 5.0 km, the tool wear width without flaking is small in the case of driven rotary cutting. Additionally, the tool wear is uniformly distributed along the circumference of the cutting edge. Furthermore, based on an examination of high-efficiency processing by increasing the feed rate, it is found that a feed rate of 0.3 mm/rev is the optimum condition from the viewpoint of wear resistance and surface roughness. Additionally, even if the cutting length amounts to 5.0 km for this condition, the flank wear is as narrow as 0.04 mm, and the tool wear progresses gradually.
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