A new internal surface finishing method of small holes by ECM using a honing machine was proposed, and the machining properties were experimentally investigated. Experimental analysis made it clear that a suitable electrolytic current density conditon exised for improving the surface roughness, and the generation of passive film on the machined surface could be prevented by mixing inverse electrolytic current into the normal one. Then, it was pointed out that the surface roughness could be reduced to approximately a half because only protruding parts were selectively removed under a proper condition. This method has the possibility to be a high efficiency internal surface finishing operation of small holes after honing.
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