Abstract
The generation mechanism of surface roughness in electrical discharge machining is experimentally analyzed, investigating the shape of a crater generated by a single pulse discharge, the interference profile of two adjacent craters and so on. Then the relationship between the shape of a single crater and the surface roughness in electrical discharge machining is discussed. Main conclusions obtained in this study are as follows:(1) The pile-up between two adjacent craters becomes maximum when the distance from a crater to another equals approximately to the diameter of a single crater.(2) Surface roughness in electrical discharge machining with longer discharge duration becomes less than the conventional theoretical one, while surface roughness with shorter discharge duration is agreeable to the theoretical one.(3) According to the frequency analysis of surface roughness curve in electrical discharge machining, the shapes of power spectra do not change for various discharge currents, while the power of shorter wave length becomes less for longer discharge duration as compared with that for shorter discharge duration.(4) An experimental relation between the surface roughness in electrical discharge machining and the shape of a single crater is obtained.
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