WIRE ELECTRIC DISCHARGE MACHINING METHOD

摘要

PROBLEM TO BE SOLVED: To adopt air wire electric discharge machining superior in machining surface roughness and machining surface straightness to machining surface finishing after liquid wire electric discharge machining case by case, by solving problems of the air wire electric discharge machining such as narrow gaps and the occurrence of short circuit and the severance of wire to enable stable machining. SOLUTION: Air wire electric discharge machining of a finishing step is conducted by using a complex electrode wire wherein a core wire is made of a conductive alloy and an outer layer is made by coating metal having a low evaporating temperature such as zinc and cadmium or an alloy including at least 50% by weight of the metal, as a wire electrode. The air wire electric discharge machining works on each successively changed offset one and more specified times, in each stage of machining conditions of successively changed multiple stages.