Surface layer forming apparatus using electric discharge machini

Details Surface layer forming apparatus using electric discharge machini Surface layer forming apparatus using electric discharge machini

1994-12-21

1997-12-02

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6914, 427580, B23H 100

Patent

active

056932405

ABSTRACT:
An apparatus and process for forming surface layers on electrodes by electric 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.

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