电火花加工钛合金电参数对重铸层的影响规律研究  

Investigation of the influence law of EDM electrical parameters on the recast layer in titanium alloys

作　　者：王泽涵 周明 宋子雄 赵萌 徐佩 辛方晴 WANG Zehan;ZHOU Ming;SONG Zixiong;ZHAO Meng;XU Pei;XIN Fangqing(School of Mechanical Electronic and Vehicle Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学机电与车辆工程学院,北京100044 [2]中国航发动力股份有限公司,西安710016

出　　处：《现代制造工程》2024年第6期111-121,共11页Modern Manufacturing Engineering

基　　金：国家“慧眼行动”快速应用项目资助项目(HYXD-2020-01)。

摘　　要：电火花加工(Electric Discharge Machining,EDM)后工件表面产生的重铸层(recast layer)严重影响工件的表面完整性和机械性能。重铸层厚度(Recast Layer Thickness,RLT)是电火花加工的一项重要工艺指标,特别是在电火花加工钛合金中更为关键,重铸层厚度主要受电参数的影响。以钛合金Ti6Al4V为试验对象,首先讨论主要电参数(峰值电流、脉宽、占空比和间隙电压)对重铸层厚度的影响规律;然后基于重铸层对表面粗糙度和材料去除率带来的影响,在考虑重铸层厚度、表面粗糙度和材料去除率等多目标下优化电参数组合;最后,结合不同重铸层厚度的加工要求,总结电参数选择原则。经试验验证,最优电参数组合在满足薄重铸层厚度和低表面粗糙度的同时,材料去除率提升了2.76倍。The recast layer formed on the surface of a workpiece after Electrical Discharge Machining(EDM)significantly im-pacts the surface integrity and mechanical properties of the workpiece.The Recast Layer Thickness(RLT)has become an impor-tant process parameter in EDM,especially critical in EDM of titanium alloys.The RLT is primarily affected by electrical parame-ters.Taking the titanium alloy Ti6Al4V as a case,first,the influences law of main electrical parameters(peak current,pulse du-ration,duty cycle,and gap voltage)on the RLT were discussed.Furthermore,based on the impact of the recast layer on surface roughness and material removal rate,an optimized electrical parameter combination was conducted considering multiple objectives including RLT,surface roughness,and material removal rate.Finally,the principles for electrical parameter selection were summa-rized in accordance with different RLT requirements.Experiments verified that while the optimal electrical parameter combination achieved a thin RLT and low surface roughness while realizing an improved 2.76 times material removal rate.

关 键 词：电火花加工 钛合金 重铸层 正交试验 灰关联分析法 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]