WIRE ELECTRIC DISCHARGE MACHINING APPARATUS.

摘要

In a wire electrical discharge machining apparatus, a wire electrode 401 and a workpiece 405 are located in an opposed manner with a designated gap and an electrical discharge is generated intermittently between the wire electrode and the workpiece to thereby machine the workpiece. This wire electrical discharge machining apparatus includes a direct current voltage applying unit 407 and a low frequency component detecting circuit 408. The direct current voltage applying unit 407 applies a direct current voltage in the gap. The low frequency component detecting circuit 408 detects a low frequency component of a voltage occurring in the gap. This wire electrical discharge machining apparatus monitors a state in the gap based on an output of the low frequency component detecting circuit 408 and controls a feed rate that depends on the state in the gap. <IMAGE>