Study On Factors Detering The Discharge Delay Timein Die-sinking EDM

Die-Sinking EDM are widely used in manufacturing application, especially incomplicated shapes and special materials machining, due to its several advantages suchas insignificant forces, non-contacting machining and its wide range of application.However, EDM gap phenomena can hardly be observed and its processing is influencedby many factors, so the research on the EDM micro-machining process hasn’t gonefurther enough. With the development of modern manufacturing technology, the demandfor product of people is higher and higher and the shortage on basic theories ofDie-Sinking EDM already become the main obstacle to its further development.The study on discharge location and discharge delay time are important parts ofEDM basic theories and it can help people understand the discharge process. Moreimportantly, the research are beneficial to optimizing servo control strategies, improvingforming precision and process stability and achieving high machining speed. Dischargedelay time and discharge location which are used for describe electric dischargephenomena are closely related with each other and they also have a lot of commoninfluence factors such as discharge gap, debris particles and dielectric liquid. Thedischarge location searching algorithm based on the discharge theory has relateddischarge location and the minimum discharge delay time by developing a mathematicalmodel that describes the relation of the average discharge delay time and gap width,machining area, debris diameter as well as concentration of debris particles, and providea new way of electrode wear forecasting in Sinking EDM.This paper that analyzed the relation between discharge delay time and dischargeprobability and introduced the factors influencing discharge delay time providing thetheoretical basis for single pulse discharge experimental. Meanwhile, according to theexperimental requirements the single pulse discharge detection circuit and bridgingcircuit were designed and the experimental platform was build. This paper alsoinvestigates the relation between discharge delay time and gap width, machining area,debris diameter, concentration of debris particles as well as other experimental conditionswith single pulse discharge experiment and builds a mathematical model for electrodewear forecasting which laid a theoretical foundation for discharge location searchingalgorithm. Finally, the simulation of electrode wear in Sinking-EDM was carried out withcomputer, which verified the feasibility of the discharge location searching algorithmabout electrode wear.