Patent ID: 9676046
Date: 2017-06-13
CPC Classifications: B23H

Claim:
1. An electrodischarge machining method which uses an electrodischarge machine which is provided with a columnar or cylindrical shaped electrode so as to form a through hole which has a straight part and an inclined part connected with the straight part in a workpiece, comprising: an inclined part machining process which arranges the electrode so that an axis of the electrode extends in a depth direction of the through hole while making the electrode move relative to the workpiece and uses electrodischarge machining to form the inclined part; a straight part machining process which arranges the electrode so that the axis of the electrode extends in the depth direction of the through hole while making the electrode move relative to the workpiece and uses electrodischarge machining to form the straight part; and an inside wall surface machining process which arranges the electrode so that the axis of the electrode becomes perpendicular to an inside wall surface of the inclined part which is formed by the inclined part machining process while making the electrode move relative to the workpiece to machine the inside wall surface of the inclined part by electrodischarge machining.