Method of electrical-discharge-machining a conductive workpiece

Details Method of electrical-discharge-machining a conductive workpiece Method of electrical-discharge-machining a conductive workpiece

1981-07-27

1984-07-10

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 69E, 21914622, 252502, B23P 108, H01J 900

Patent

active

044594534

ABSTRACT:
An EDM method utilizing an improved tool electrode made of a sintered carbonaceous body consisting essentially of 50 to 90% graphitized carbon and the balance nongraphitized carbon uniformly distributed therein. The body may be prepared by sintering a mass of graphitized carbon particles and nongraphitized carbon particles mixed uniformly together in an optimum proportion under pressure. During sintering, the mass may be compressed bi-axially but is preferably tri-axially or isostatically compressed. The carbonaceous body of the invention may be prepared by sintering together graphitized carbon particles and a predecessor of the nongraphitized carbon, by sintering a uniform mixture of a predecessor of graphitized carbon and a predecessor of nongraphitized carbon. The predecessor of nongraphitized carbon is advantageously constituted by phenol and/or furan.

REFERENCES:
patent: 3911246 (1975-10-01), Drinkard, Jr.

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