PCD和CVD金刚石刀具切削性能对比及失效机理初探  

Comparison of cutting performances and failure mechanism of PCD and CVD diamond tools

作　　者：张岩[1] 吕反修[1] 贺琦[1] 宋建华[1] 刘政[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《金刚石与磨料磨具工程》2009年第1期49-52,57,共5页Diamond & Abrasives Engineering

摘　　要：通过切削实验,观察切削前后刀具的表面和刃口形貌、金刚石刀片组成成分、以及被加工工件表面粗糙度,比较两种刀具的切削性能,探讨其失效机理。结果表明:在同等条件下,CVD金刚石刀具的切削性能要明显优于PCD刀具。在车削过程中,PCD刀具的失效机理主要是结合剂与被加工材料中化学成分发生化学反应使结合剂流失,导致刀具结构疏松,从而导致磨粒团脱落。CVD刀具的失效机理为产生变质层磨损。切削过程中随着加工时间的进一步延长,切削区温度不断升高,当达到热化学反应温度时,就会在刀具表面形成变质层,从而带来切削过程中刀具的磨损;同时高温状态下CVD金刚石的晶界疲劳破坏,也可能会造成CVD金刚石刀具的磨损失效。Cutting experiment on hard plastic PMMA was conducted with PCD and CVD cutter respectively.The edge and surface morphology and composition of the PCD and the CVD diamond insert,as well as the surface roughness,were studied before and after the cutting process.The cutting performance of these tools was compared and their failure mechanism was explored.The results showed that under the same machining condition,the cutting performance of the CVD diamond tools was superior to that of the PCD tools.The main fail...

关 键 词：PCD刀具 CVD金刚石刀具 切削性能 失效机理 

分 类 号：TG711[金属学及工艺—刀具与模具]