LI Shi, ZHU Xinbin

 

(School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China )

 

 

Abstract: In order to solve the problem of graphite electrode online repairing in electrical discharge machining (EDM), the graphite electrode online repairing method by reverse processing was proposed based on the machining conditions and parameters of existing electrical discharge machine tools. Reverse processing experiment scheme of the conditions and parameters was designed according to the electrical discharge machining experience, and then the electrode reverse processing experiments were carried out at different conditions and parameters of discharge on time, discharge off time, peak current, auxiliary circuit, servo speed, thus the influences of their erosion to graphite electrodes were obtained, and through analysis and induction, the conditions and parameters for the graphite electrode online reverse processing were summarized, and finally the conditions and parameters were validated by the reverse repairing and reverse processing graphite electrodes. The experimental results show that the method of online reverse repairing graphite electrodes is feasible and efficient by selecting suitable processing conditions and parameters in the existing EDM machine tools.

 

Key words: graphite electrode; online repairing; machining conditions and parameters; electrosparking