WIRE ELECTRIC DISCHARGE MACHINE

摘要

For providing a wire electrical discharge machining apparatus enabling improving machining speed at power feeding from a high impedance path in mixed use of the high impedance path and a low impedance path in a main discharge current path, the wire electrical discharge machining apparatus includes a path open/close unit that individually opens and closes each of the high impedance path and the low impedance path, an open/close pattern setting unit that sets an open/close pattern in which a combination of closing one of the feeding paths and opening another one of the feeding paths is designated for switching power feeding between the high impedance path and the low impedance path, an open/close pattern generating unit that changes pulse energy per feeding pulse in a present feeding path to reduce a difference in discharge pulse energy applied to an inter-electrode gap from a machining power supply between at a time of high-impedance-path feeding and at a time of low-impedance-path feeding, and an open/close unit that controls opening and closing of the path open/close unit in accordance with an open/close pattern in which feeding pulse energy is changed.