陶瓷刀具高速铣削镍基高温合金的磨损机理

Mechanism tool wear of ceramic tools used for high speed milling of nickel-based superalloys

为探讨高速切削中陶瓷刀具的磨损机理,以镍基高温合金GH4169为加工材料,采用仿真和实验相结合的方法,研究不同铣削深度、宽度及切削速度对刀具应力分布和磨损形貌的影响规律。结果表明:陶瓷刀具切削加工的仿真应力云图和实验结果一致。随铣削深度增加,刀具前刀面应力集中,刀具磨损有增大趋势;随铣削宽度增加,刀具前刀面磨损区域扩大,但刀具磨损程度相对减少。随切削速度增加,刀具后刀面沟槽磨损值有减小趋势。该研究可为陶瓷刀具高速加工切削参数的选择提供理论参考。

This paper seeks to investigate the wear mechanism underlying ceramic cutting tools in high speed cutting. The study drawing on GH4169 and using the combination of simulation and experiment delves into the law behind the effect of different milling depth, milling width and cutting speed on tool stress distribution and wear morphology. The results show that the consistency exists between the simulated stress nephogram and the experimental results; an increase in milling depth gives tool rake face a concentrated stress, increasing the tool wear trend; an increase in milling width means an enlarged wear area of the tool rake face, but accompanied by a relative reduction in the tool wear degree; and an increase in cutting speed leads to a decreasing trend in the wear value of the groove of the tool flanks. The research may provide theoretical guidance for cutting parameters selection of high speed machining of ceramic tools.