涂层高速钢刀具切削机理研究

Research on the Cutting Mechanism of Coated High Speed Steel Cutting Tools

在国外,TiN涂层高速钢刀具已广泛应用于生产。在国内,这项技术起步较晚,目前应用还不普遍,其中一方面原因是TiN涂层高速钢刀具的成本要提高40～100%;其次高速钢刀具必然存在用钝重磨的问题,有些刀具只重磨后刀面,而有些刀具只重磨前刀面,涂层刀具重磨一个刀面后,刀具耐用度及加工表面粗糙度是否仍比未涂层刀具优越,其切削机理又如何,这些都缺乏系统的研究。本文的研究,阐明了上述刀片的切削机理。

Through the investigation about roughness of machined surface, tool wear, cutting force, friction coefficient, tool-chip contact length, and built-up edge, this paper discusses the cutting mechanism of three types of high speed steel cutting tools with TiN coating (totally coated, with reground flank, with reground rake face) and one type without any coating.