Effect of no-load rate on recast layer cutting by ultra fine wire-EDM  

作　　者：Ming ZHANG Zhidong LIU Hongwei PAN Cong DENG Mingbo QIU 

机构地区：[1]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

出　　处：《Chinese Journal of Aeronautics》2021年第4期124-131,共8页中国航空学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51575271 and 51975290)。

摘　　要：Via material erosion in wire electrical discharge machining(WEDM),recast layers form on the surfaces of workpiece.In addition,ultra fine Wire-EDM can be usually cut once.To reduce the thickness of the recast layer as much as possible,the wire electrical discharge-electrochemical machining(WEDCM)method was proposed,which is based on the micro conductivity of the dielectric and microelectrolytic characteristics by adjusting the no-load rate of the pulse in the machining process.Furthermore,a state discrimination and servo control system based on discharge current was designed.The experiment results of different no-load rates show that the electrolytic effects increase as the no-load rate increases,and the main machining process is spark discharge erosion with a no-load rate in the range of 10%to 80%.At 90%no-load rate,the amount of recast layer formation in the forward direction of the wire electrode is almost the same as that of electrolytic dissolution,and it can be practically processed without a recast layer.Compared with10%no-load rate,the kerf width only increases by 7.5%.

关 键 词：Electrolytic dissolution coefficient No-load rate Recast layer Ultra fine wire WEDCM 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程] TG662[金属学及工艺—金属切削加工及机床]