聚晶立方氮化硼刀具刃口放电加工工艺研究  

Study on Electrical Discharge Machining Technology of Polycrystalline Cubic Boron Nitride Cutting Tool

作　　者：贾云海[1,2] 李建钢[2] 朱立新[2] 宋英杰[2] 

机构地区：[1]北京市电加工研究所,北京100191 [2]北京迪蒙特佳工模具技术有限公司,北京100191

出　　处：《电加工与模具》2012年第1期7-10,19,共5页Electromachining & Mould

基　　金：北京市优秀人才培养资助项目(2010D002022000003)

摘　　要：通过调整电火花加工的主要放电参数(脉冲宽度和加工电流),对聚晶立方氮化硼(PCBN)样刀进行放电加工,进而对样刀刃口表面进行X射线衍射分析,并在扫描电子显微镜下观察其表层结构及能谱分析。通过对加工后样刀表面变质层主要成分及产生原因的分析,总结了脉冲宽度和加工电流对样刀表面变质层厚度、刃口表面粗糙度影响的关系曲线,为制定精密快速放电加工PCBN刀具的工艺提供了重要依据。The samples of polycrystalline cubic boron nitride（PCBN） cutting tool were machined by adjusting the main parameters of electrical discharge machining （EDM）. After the machining, the phases were analyzed by X-ray diffraction analyzer and the surface layer microstructure was observed by scanning electronic microscope. The fundamental component of machined PCBN cutting tool affected layer was obtained and the reason of begetting affected layer was analyzed. The relationship curves between pulse width, working electric current and depth affected layer, blade surface roughness were summarized. The results showed that to adjust electrical discharge machining parameters, such as decreasing pulse width or machining electric currents, can reduce the depth of affect layer and improve blade surface roughness. These researches provide valuable test reference for drawing up electrical dis- charge machining technology of PCBN cutting tool.

关 键 词：PCBN 电火花加工 加工工艺 变质层 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]