摘要
为解决聚晶金刚石(PCD)表面加工成型和抛光难题,提高PCD加工效率和表面加工质量,采用电火花粗、精放电加工工艺及金刚石砂轮磨削加工工艺对PCD表面进行加工,并采用SEM、EDS、XRD和Raman等观察分析不同加工方式下PCD的表面形貌、表层组织及结构,对不同加工方式下PCD的显微硬度和耐磨性进行测试,考察不同加工方式对PCD表层微结构与力学性能的影响。结果表明:电火花加工后PCD表面会发生金刚石石墨化,而机械磨削加工后则不会;电火花精加工后PCD的显微硬度和耐磨性分别是5613HV10和Q5.8×10^4,机械磨削加工后则分别是5727HV10和Q5.4×10^4,二者相比变化不大,而电火花粗加工后的则是4604HV10和Q4.7×10^4,性能降低明显。同时提出放电加工后PCD表面变质层的概念,并讨论其变质层产生的原因。
In order to solve the problems of surface forming and polishing of polycrystalline diamond(PCD),and improve PCD processing efficiency and surface quality,the PCD surface was machined by EDM coarse/fine discharge or diamond grinding wheel.The surface morphology,composition and microstructure of PCD were observed and analyzed by SEM,EDS,XRD and Raman spectroscopy.The microhardness and wear resistance of PCD in different processing modes were tested and analyzed.The influences of different processing methods and modes on microstructures and mechanical properties of PCD surface were investigated.Experimental results show that there are graphitizations on the PCD surface after EDM,but none on that after mechanical grinding.The microhardness and wear resistance of EDM precision machined PCD are 5613 HV 10 and Q 5.8×10^4 while those of mechanically ground PCD are 5727 HV 10 and Q 5.4×10^4.There is limited difference between them.As with the EDM rough machining,the values are 4604 HV 10 and Q 4.7×10^4,respectively.The performance is significantly reduced.The concept of the surface metamorphic layer of PCD after discharge machining is proposed,the reasons of which are discussed.
作者
邓福铭
张黎燕
邓雯丽
刘嘉霖
杨雪峰
闫晓
卢学军
DENG Fuming;ZHANG Liyan;DENG Wenli;LIU Jialin;YANG Xuefeng;YAN Xiao;LU Xuejun(Institute of Superhard Cutting Tool Materials,China University of Mining and Technology(Beijing),Beijing 100083,China;Henan Vocational Institute of Electrical and Mechanical,Zhengzhou 451191,China;Henan Province Superhard Material Intelligent Manufacturing Equipment Integration Key Laboratory,Zhengzhou 451191,China)
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2019年第5期33-38,共6页
Diamond & Abrasives Engineering
基金
北京市自然科学基金与北京市科学技术研究院联合资助基金(No.L150012)
关键词
聚晶金刚石
电火花加工
机械磨削
变质层
微结构表征
polycrystalline diamond(PCD)
electrical discharge machining(EDM)
mechanical grinding
surface metamorphic layer
microstructure characterization
