钛合金与镍基高温合金薄片振动辅助电火花加工工艺参数优化研究  

Study of Optimizing Machining Parameters of Nickel and Titanium Alloys Sheets by EDM Aided by Vibration

作　　者：王笑影 马良奇 宋涛[1] 龙金 余祖元[1] WANG Xiaoying;MA Liangqi;SONG Tao;LONG Jin;YU Zuyuan(Key Laboratory for Precision and Non-traditional Machining of Ministry of Education,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,辽宁大连116024

出　　处：《电加工与模具》2020年第2期19-24,33,共7页Electromachining & Mould

基　　金：国家自然科学基金资助项目(91860134)。

摘　　要：在航空发动机叶片的电解加工过程中,由于存在加工间隙,导致加工后的叶片边缘存在尺寸与形状误差。采用电火花加工并辅以振动对叶片边缘进行粗、精加工修整,考虑到电火花加工参数与工件材料加工特性存在不确定性,通过正交试验探究了粗加工的峰值电流、脉冲宽度、振幅和振动频率对材料去除率、工具电极相对体积损耗率的影响。采用横截面尺寸为29 mm×0.5 mm的钛合金和镍基高温合金薄板作为工件进行长度2 mm的切断实验,通过极差分析法和方差分析法获得加工最优参数,并得出镍基高温合金、钛合金材料去除率最高分别达12.99、13.13 mm3/min,为后续利用成形电极对叶片边缘进行精密修整提供可参考的有效电加工参数。Electrochemical machining(ECM)is an effective and economical way to machine aero-engine blades.However,the flow field and electric field in the gap of ECM are very complex,which results in dimensional and shape errors of leading and trailing edges of blade.In this study,vibration-assisted electrical discharge machining(EDM)is used to correct those errors.Due to the uncertainty of EDM performance under different conditions,the orthogonal experimental design is used to investigate the effects of peak current,pulse on-time,amplitude and frequency of vibration on material removal rate(MRR),tool electrode wear rate(TWR)on rough trimming of leading and trailing edges of blade.Titanium alloy and nickel base superalloy sheet with a cross-sectional size of 29 mm×0.5 mm are used as workpieces for the cutting experiment with a length of 2 mm.The optimal machining parameters have been obtained by range analysis and variance analysis.The highest MRR of nickel-based superalloy is 12.99 mm3/min and that of titanium alloy is 13.13 mm3/min.This provided optimal parameters for the subsequent finish trimming of blade edges.

关 键 词：电火花加工 钛合金和镍基高温合金 正交试验 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]