Power supply unit for wire electrical discharge machining and method of wire electrical discharge machining

摘要

A power supply unit for wire electrical discharge machining using an ac high-frequency power supply for applying an ac high-frequency voltage between a wire electrode (1a) and a workpiece ( 2 ) includes a high-frequency oscillation and amplification circuit ( 4 ) and a pulse power supply ( 5 ) which is an ac-high-frequency-voltage intermittently supplying unit for effecting the application of the ac high-frequency voltage between the electrode and the workpiece and a pause thereof. In wire electrical discharge machining using this power supply unit for wire electrical discharge machining, it is possible to suppress the vibration of the wire electrode (1a) due tog the electrostatic force acting between the wire electrode (1a) and the workpiece ( 2 ), making it possible to improve the straightness accuracy of a machined surface of the workpiece ( 2 ) and make surface roughness small.