MULTI-WIRE ELECTRICAL DISCHARGE MACHINING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a multi-wire electrical discharge machining apparatus which can effectively process a wire without breaking the wire.SOLUTION: A multi-wire electrical discharge machining apparatus 1 comprises a high frequency pulse power supply unit 60 which supplies a high frequency pulse power to a wire R and an ingot I. The high frequency pulse power supply unit 60 comprises: a processing electrical power supply source 61; a power feed terminal 70 which so contacts parallel wires R as to apply electric power from the processing electrical power supply source 61 to the wires; and a connection circuit 80 which connects the processing electrical power supply source 61 and the power feed terminal 70 via a switch. The power feed terminal 70 includes a first power feed terminal 71 and a second power feed terminal 72 which contact the wires R of different rows and are insulated from each other. The connection circuit 80 has: a first circuit 81 which connects the first power feed terminal 71 and the processing electrical power supply source 61 to each other via a first switch 81a; and a second circuit 82 which connects the second power feed terminal 72 and the processing electrical power supply source 61 via a second switch 82a.SELECTED DRAWING: Figure 3