Electrical discharge methods and apparatus therefor

Details Electrical discharge methods and apparatus therefor Electrical discharge methods and apparatus therefor

1988-08-11

1989-09-26

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

219 6917, B23H 108

Patent

active

048702439

ABSTRACT:
An electrical discharge apparatus comprises a plurality of electrodes mounted on an electrode carrier and spaced from a workpiece surface to define a gap across which a train of electrical pulses are transmitted. Dielectric fluid is present within the gap and controlled additions of solid particles are made to the dielectric fluid, with the particles being of a material of different electrical conductivity and/or permittivity to that or those of the dielectric fluid. The concentration by volume of the particles within the dielectric fluid lies within the range 0.05% to 7.0% and the size of the majority of the added particles is in excess of 7 microns. The particles are of a material having a relatively high electrical conductivity, e.g., graphite or metallic particles. Alternatively, the particles are formed from a material having good electrical insulating properties, e.g., glass, ceramic or certain metallic oxides.

REFERENCES:
patent: 4375588 (1983-03-01), Frei
patent: 4417962 (1983-11-01), Inoue
patent: 4553012 (1985-11-01), Anderson
"The Role of the Dielectric Fluid in Electrical Discharge Machining" by Terry Hockenberry, 10/1968, pp. 1-9.

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