Mechanism of wear of superhard coated tools in high-speed dry milling of hardened steel
超硬涂层刀具高速干铣削淬硬钢的磨损机理

摘要

超硬涂层刀具在高速干铣削淬硬钢过程中，其磨损行为受多重因素耦合影响。高速切削产生的高温环境加速涂层氧化与热疲劳，导致涂层与基体结合强度下降；淬硬钢高硬度特性引发剧烈的机械摩擦与冲击，造成涂层磨粒磨损和微裂纹扩展；干切削条件下缺乏润滑冷却，进一步加剧刀具表面黏结磨损与扩散磨损。研究表明，涂层成分、切削参数及工件材料性能的匹配性，直接影响刀具磨损速率与失效形式。明确该过程的磨损机理，对优化超硬涂层设计、提升刀具使用寿命及推动绿色切削技术发展具有重要意义。

Abstract

The wear behavior of super-hard coated tools during high-speed dry milling of hardened steel is influenced by the coupling of multiple factors. The high-temperature environment generated by high-speed cutting accelerates coating oxidation and thermal fatigue, leading to a decrease in the bonding strength between the coating and the substrate. The high hardness of hardened steel causes intense mechanical friction and impact, resulting in abrasive wear of the coating and the propagation of microcracks. The lack of lubrication and cooling in dry cutting conditions further exacerbates adhesive wear and diffusion wear on the tool surface. Studies have shown that the matching of coating composition, cutting parameters, and workpiece material properties directly affects the tool wear rate and failure modes. Clarifying the wear mechanism in this process is of great significance for optimizing the design of super-hard coatings, improving tool service life, and promoting the development of green cutting technology.