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This paper deals with the effect of minimal quantity lubrication (MQL) on tool life (flank wear), crater wear of various coated high-speed steel tools and finished surface roughness in hobbing. Experiments were conducted by simulation hobbing by fly tool cutting on a milling machine. The results are summarized as follows. (1) When changing the kinds of coating films, a TiAlN-coated tool showed the longest tool life. Tool lives of almost of the tested coated tools obtained with MQL system are longer than those obtained by dry cutting, and the wear reduction effect by MQL was recognized. Especially, an AlCrSiN-coated tool showed the tool life more than twice compared with dry cutting. (2) It is assumed that the crater wear is caused by the delamination of the coting film, and the crater wear in the case of MQL occurs earlier than that in dry cutting. Both in dry cutting and MQL, the crater wear does not appear on the AlCrSiN-coated tool, which is effective for the crater wear. (3) In all of tested coated tools, the finished surface roughness obtained with MQL is smaller than that obtained by dry cutting. When using TiAlNand AlCrSiN-coated tools, the surface roughness reduction effect by MQL is large. The TiAlN-coated tool showed the smallest surface roughness of the four kinds of coated tools. (4) From the viewpoints of tool life, crater wear and finished surface roughness, TiAlNand AlCrSiN-coated tools are suitable for MQL system. 1. 緒 言 ホブ切りにおいて,高速度鋼ホブを用いて,多量の不水溶性切削油剤を供給して歯切りすることが従来より一 般的に行われているが,工具摩耗低減効果や冷却効果がある反面,多量注油の場合,発煙や臭気による作業環境 の悪化や廃油処理などが問題となり,環境に配慮した加工法の開発が求められている.旋削,フライス加工,ド リル加工などの機械加工においては,ドライ加工やセミドライ加工技術の開発が行われている(Klocke and 700 Dannoharu, Oita 870-1192, Japan 700 Dannoharu, Oita 870-1192, Japan Received 25 August 2014

Effect of MQL on wear behavior of various coated tools in hobbing (Fundamental experiments using fully coated tools)