Super-fine finish EDM method and apparatus

Details Super-fine finish EDM method and apparatus Super-fine finish EDM method and apparatus

1981-07-29

1984-05-22

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 69G, 315207, B23P 108

Patent

active

044503369

ABSTRACT:
An EDM method and apparatus wherein a tool electrode is spacedly juxtaposed with a conductive workpiece across a machining gap filled with a dielectric liquid and a succession of localized, time-spaced, repetitive and randomly dispersed machining electrical discharges are effected between the tool electrode and the workpiece across the machining gap to remove stock from the workpiece uniformly over the surface thereof juxtaposed with the tool electrode. The surface finish of the stock-removed surface of the workpiece is improved by discharging electrical charge stored due to a stray capacitance across the tool electrode and the workpiece, through an electrical shunt circuit in parallel with the machining gap immediately prior to initiation of each of the machining electrical discharges across the machining gap.

REFERENCES:
patent: 3056065 (1962-09-01), Porterfield
patent: 3109120 (1963-10-01), Scarpelli
patent: 3956609 (1976-05-01), Marendaz
patent: 4162425 (1979-07-01), Larsen et al.
patent: 4237370 (1980-12-01), Ullmann
patent: 4335294 (1982-06-01), Inoue

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