氧化锆生物陶瓷铣削的刀具磨损

为了研究完全烧结氧化锆陶瓷铣削过程中金刚石刀具的磨损及其对切削过程的影响，进行了氧化锆铣削实验。分析了刀具磨损带的扩展过程以及切削力随刀具磨损过程的变化规律。通过观测切削表面微观形貌随刀具磨损过程的演变，对刀具磨损与切削模式之间的关系进行了探讨，最后揭示了刀具磨损机理。研究结果表明：铣削氧化锆陶瓷时刀具磨损随切削过程从刃口扩展到后刀面，同时切削模式从延脆混合去除转变为完全脆性去除，刀具磨损模式是崩刃、剥落及石墨化磨损。

Tool Wear in ZrO2 Bioceramic Milling Processes

In order to study the diamond tool wear and its effects on the cutting process in conventional milling of full-sintered ZrO2, long distance milling experiments of ZrO2 bioceramic were carried out. The propagation of  tool wear zone with cutting time and the variation of cutting forces with tool wear process were analyzed. The relation between tool wear and material removal model was discussed by analyses of the influences of tool wear on the micrograph of machined surface. At last, the tool wear mechanism was investigated. The research fruits show that the tool wear extended from cutting edge to flank face with the cutting process in conventional milling of ZrO2, while the material removal model changes from ductile-brittle removal to all-brittle one. The tool wear model is composed of chipping, peeling and graphitic wear.