This paper presents investigations on discharging mechanism in powder mixed EDM.By analyzing the inception, growth of electrical tree and the ignition of discharges in liquid filled gap,the whole discharging process is proposed.It is explored that the reason of modification of ignition behaves by adding fine particle powders of metal or semiconductor to the working liquid.

Research on Discharging Mechanism of Powder Mixed EDMWANG Yuangang ZHAO Fuling (Key Laboratory for Precision and Non.traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian 116024,ChinaThis paper presents investigations on discharging mechanism in powder mixed EDM.By analyzing the inception, growth of electrical tree and the ignition of discharges in liquid filled gap,the whole discharging process is proposed.It is explored that the reason of modification of ignition behaves by adding fine particle powders of metal or semiconductor to the working liquid.PMEDM;;electrical tree;;discharge;;breakdown;;mechanism