Electro-discharge machining electrode

Details Electro-discharge machining electrode Electro-discharge machining electrode

1988-07-15

1990-05-01

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 6917, B23P 108

Patent

active

049220764

ABSTRACT:
An improved electrode for producing cone-shaped diffusion openings in the wall of an air-cooled rotor blade of a jet engine or other gas turbine by means of electro-discharge-machining (EDM), is described. The electrode has a needle-like forward end section for forming a round air metering hole, and a cone-like head section which permits the formation of a cone-shaped diffusion opening. The hole and the diffusion opening are formed with a single electrode in one operation. Also described is the method of forming such an electrode by a coining step.

REFERENCES:
patent: 2984731 (1961-05-01), Bradshaw et al.
patent: 3087043 (1963-04-01), Hofer
patent: 3740519 (1973-06-01), O'Connor
patent: 4197443 (1980-04-01), Sidenstick
patent: 4529493 (1985-07-01), Rager
patent: 4650949 (1987-03-01), Field
patent: 4664597 (1987-05-01), Auxier et al.
patent: 4684323 (1987-08-01), Field
patent: 4739145 (1988-04-01), Check et al.

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