EDM drilling of low angle holes

Details EDM drilling of low angle holes EDM drilling of low angle holes

1992-12-22

1994-05-17

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

2041297, 219 6915, B23H 910, B23H 914

Patent

active

053130383

ABSTRACT:
Low angle air directing slots in the tip of an airfoil are produced by forming an elongated electrode by forming notches on opposite sides of the electrode and performing electric discharge machine with the electrode. During machining the electrode is oriented and fed at an acute angle with respect to the surface of the airfoil tip to form an opening, and then rotating the electrode to a position increasingly perpendicular to the surface of the airfoil tip.

REFERENCES:
patent: 2902584 (1959-09-01), Ullmann
patent: 4104503 (1978-08-01), Di Piazza et al.
patent: 4650949 (1987-03-01), Field
patent: 4922076 (1990-05-01), Cross et al.
patent: 4992025 (1991-02-01), Stroud et al.

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