The pulse discharge model of wire EDM was established, and the temperature field distribution of single pulse discharge was analyzed by finite element method. The geometric characteristics of discharge pits on the workpiece and electrode wire under this condition were calculated, and compared with the process indicators such as surface roughness, electrode relative loss ratio, cutting speed under actual cutting conditions. According to the processing characteristics of wire EDM, the correction was made, and the erosion law of wire EDM was studied. The results show that the geometric characteristics of the simulated single pulse discharge pit can approximately represent the surface roughness of actual continuous cutting after correction; the channel transfer of the discharge point on the electrode wire in actual cutting is the main reason for the low relative loss of the electrode wire; considering the factors related to actual cutting, the theoretical cutting speed is consistent with the actual value after correction.
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