ELECTRIC DISCHARGE MACHINING APPARATUS AND ELECTRIC DISCHARGE MACHINING METHOD

摘要

Disclosed is an electric discharge machining apparatus that supplies an aqueous machining fluid to a machining gap (9) formed between a workpiece (W) constituted of a WC-Co super-hard alloy or steel and a tool electrode (E) while performing electric discharge machining on the workpiece. The electric discharge machining apparatus includes a power supply device (20) for applying an AC voltage pulse to the machining gap, an average gap voltage setting device (50) for setting the machining gap average voltage (Vmean) to the optimum value for preventing corrosion of the workpiece, and an adenine-adding device (70) for adding adenine to the machining fluid in order to adsorb corrosive metal ions.