| 摘要 |
A wire electrical discharge machining apparatus for machining a workpiece (2) by supplying discharge energy to a gap between a wire electrode (1a) and the workpiece (2) by working-electric-power supplying means (16) having a dc power supply (17) and switching means (19a, 19b, 19c, and 19d) for switching an output voltage of the dc power supply (17), and by relatively moving the wire electrode (1a) and the workpiece (2) by positioning means includes: controlling means (20) which, during machining in a gas, controls the turning on and off of the switching means (19a, 19b, 19c, and 19d) so that the voltage is set to reverse polarity whereby the polarity of the wire electrode (1a) is made positive and the polarity of the workpiece (2) is made negative.
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