基于正交试验分析的电火花放电磨削聚晶立方氮化硼复合片工艺
2019-03-14
作者：郭妍1，2，贾云海1，2，，郭建梅1，2，朱立新1，孙越1，于帆1，2
单位：1北京市电加工研究所；2电火花加工技术北京市重点实验室
摘要：聚晶立方氮化硼(PCBN)材料具有高温抗热性和高硬度，是干式车削硬态材料的最佳选择，在黑色金属加工领域得到越来越广泛的采用。目前，电火花放电磨削加工是应用广泛的聚晶立方氮化硼焊接刀具加工方法之一。以GE公司PCBN复合片8200作为试样材料，采用正交试验法，在超硬刀具电火花磨削加工机床上加工PCBN复合片，结合扫描电镜观测、粗糙度仪测试，选取电极旋转线速度、峰值电流、脉冲宽度作为主要工艺参数，以材料去除量、电极损耗作为加工效率的评价指标，以样品加工表面粗糙度、变质层厚度作为加工质量评价指标，分析电火花放电磨削加工PCBN材料的工艺。试验结果表明：当电极旋转线速度60m/min、峰值电流2A、脉冲宽度20μs时，PCBN的去除量为1.1mm3，电极损耗为3.2mm3，PCBN样品加工面的表面粗糙度达到Ra0.8μm，变质层厚度为12μm，得到比较满意的加工效果。
关键词：电火花放电磨削(EDG)；聚晶立方氮化硼复合片；正交试验；变质层
中图分类号：TG506.7；TH162文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.03.014
Electrical Discharge Grinding Polycrystalline Cubic Boron Nitride Composites
Based on Orthogonal Experiment Analysis
Guo Yan，Jia Yunhai，Guo Jianmei，Zhu Lixin，Sun Yue，Yu Fan
Abstract:Polycrystalline cubic boron nitride(PCBN) material has high thermal shock resistance and hardness at high temperature，which is an ideal choice for dry turning hard materials，and more and more widely used in the field of black metal processing.Electrical discharge grinding is one of the most widely used machining methods for polycrystalline cubic boron nitride welding tools.Taking GE PCBN compact 8200 as the sample material，and by using the way of orthogonal experiment，the PCBN composites are machined in electrical discharge grinding machine for ultrahard cutting tools machining.And with scanning electron microscopy observation and roughness tester，the electrode rotating linear velocity，peak current and pulse duration are selected as the main process parameters.And taking the material removal amount and electrode loss as a machining efficiency evaluation index，and the sample process surface roughness and metamorphic layer thickness as a quality evaluation index，the electrical discharge of grinding PCBN materials is analyzed.The test results show that：when the electrode rotates at 60m/min，the peak current is 2A，and the pulse duration is 20μs，the removal amount of PCBN is obtained to be 1.1m3，electrode loss is 3.2mm3，surface roughness of PCBN sample processing surface is Ra0.8μm，and the thickness of affect layer is 12μm.
Keywords:electrical discharge grinding (EDG)；polycrystalline cubic boron nitride (PCBN)；orthogonal experiment；affected layer