PCBN刀具切削气门座圈磨损性能研究

Research on wear performance of PCBN tools in turning of valve seat insert

文章采用PCBN刀具对气门座圈进行了高速干切削试验,使用扫描电子显微镜(SEM)观察刀具的磨损形貌,通过能谱分析(EDS)分析了刀具磨损微区表面成分,并对刀具的主要磨损机理进行了分析。研究结果表明,使用PCBN刀具高速切削粉末冶金材料时,刀具在未达到磨钝标准前就会产生脆性破损。PCBN刀具磨损机理主要为黏结剂磨损、氧化磨损和扩散磨损的综合作用。

High-speed dry turning experiments on valve seat insert with PCBN cutters were conducted.The main tool wear mechanism was discussed by observing the tool wear morphology through scanning electron microscopy（SEM）and detecting the element distribution of the worn tool surface through energy dispersive spectroscopy（EDS）.The experimental results indicated that fragile breakage occurred before it reached the blunt standard on tool flank face in high-speed turning of valve seat insert with PCBN cutters,and the main tool wear mechanism is the synergistic interaction among binder wear,oxidation wear and diffusion wear.