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

• 来源期刊: 中国航空学报（英文版）
• 年，卷（期）: 2021,（4）
• 页码范围: 124-131
• 页数: 8页
• 语种: 英文

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 with 10％ no-load rate,the kerf width only increases by 7.5％.