Electric heating – Metal heating – Cutting or disintegrating
Patent
1995-06-20
1996-10-29
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6915, B23H 100, B23H 900
Patent
active
055693946
ABSTRACT:
An insulating material is electric discharge machined with high dimensional accuracy at a high speed, by closely adhering mesh-shaped electroconductive material 5 onto the surface of an insulating material 1 so as to form an electroconductive layer 6 at the initial stage of electric discharge. In the advancement of electric discharge, fresh electroconductive layers 9, 10 are continuously formed at the bottom and the side surface of a hole 8, so that the electric discharge machining is continued even after the hole 8 becomes deeper. A porous preformed body composed of fine metal wires or a complex body containing needle metal may be used instead of the mesh-shaped electroconductive material 1. Thus, electric discharge machining is performed at a high speed, and a machined surface excellent in flatness can be obtained with high dimensional accuracy.
REFERENCES:
patent: 3723690 (1973-03-01), Nakada et al.
patent: 4847463 (1989-07-01), Levy et al.
patent: 4855557 (1989-08-01), Denny
Evans Geoffrey S.
Research Development Corporation of Japan
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