Electric heating – Metal heating – Cutting or disintegrating
Reexamination Certificate
2005-06-07
2005-06-07
Evans, Geoffrey S. (Department: 1725)
Electric heating
Metal heating
Cutting or disintegrating
C219S069120, C219S069180
Reexamination Certificate
active
06903297
ABSTRACT:
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 a working-electric-power source (16) having a dc power supply (17) and switches (19a, 19b, 19c, and19d) for switching an output voltage of the dc power supply (17), and by relatively moving the wire electrode (1a) and the workpiece (2) by a positioning device that includes: a controller (20) which, during machining in a gas, controls the turning on and off of the switches (19a, 19b, 19c, and19d) 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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Goto Akihiro
Tamida Taichiro
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
Sughrue & Mion, PLLC
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