Electric heating – Metal heating – Cutting or disintegrating
Patent
1990-03-30
1992-09-22
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6918, 333 173, B23H 102
Patent
active
051499312
ABSTRACT:
A power source for electric discharge machining, which performs a semi-mirror-finish machining operation with a surface roughness of 1 .mu.m Rmax or less. The power source includes either a resonance circuit or an impedance matching circuit so that the electric discharge is carried out under the condition that resonance is caused to occur with the capacitance of an interelectrode gap between an electrode and a workpiece to be machined or the impedance-matching is effected in response to variation in interelectrode condition. With such a power source, it is possible to eliminate the effect of the stray capacitance exsiting in a current supplying line and also to eliminate the shortcoming due to variation on the interelectrode condition, and therefore a mirror-finished machining operation can be stably carried out to provide machined surfaces excellent in surface roughness.
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Evans Geoffrey S.
Mitsubishi Denki K.K.
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