Electrical discharge processing device for making holes in workpieces has guide part for holding electrode so that it can move reciprocally axially and for feeding electrode to hole

摘要

The device has a workpiece (10), an electrode (30) for producing an electrical discharge between the electrode and workpiece to form a hole in the workpiece and a guide part (20) for holding the electrode so that it can move reciprocally axially and for feeding the electrode to the hole. A conical recess (11) is formed in the workpiece and an inclined surface is formed in the guide part with its center aligned with the recess. AN Independent claim is also included for the following: an electrical discharge processing method for making holes in workpieces.