Electric heating – Metal heating – Cutting or disintegrating
Patent
1995-03-30
1997-12-16
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
427580, B05D 314
Patent
active
056981147
ABSTRACT:
An apparatus and process for forming surface layers on electrodes by electron discharge machining. A machining gap, between an electrode and a workpiece is filled with a dielectric mixture containing metallic or submetallic powder. The apparatus uses a swinging mechanism to move the electrode during processing. The apparatus uses a high-voltage superposition circuit to superpose a voltage of 100-400 V across the gap. The apparatus uses a current limiting resistor of 100-300 .OMEGA. to ensure that the main circuit supplies a low voltage of approximately 100 V to the machining gap. In a second embodiment, the apparatus prevents electrode cracking by dispersing the discharges throughout, and widening, the machining gap.
REFERENCES:
patent: 3365612 (1968-01-01), Shierholt
patent: 4251706 (1981-02-01), Frei et al.
patent: 4375588 (1983-03-01), Frei
patent: 4467167 (1984-08-01), Oizumi et al.
patent: 4948625 (1990-08-01), Suzuki et al.
Magara Takuji
Mohri Naotake
Saito Nagao
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
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