Apparatus and method for fast hole drilling by electrical discha

Details Apparatus and method for fast hole drilling by electrical discha Apparatus and method for fast hole drilling by electrical discha

1994-01-28

1995-02-21

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6911, 219 6914, B23H 100, B23H 914

Patent

active

053918509

ABSTRACT:
An apparatus and method for fast hole drilling by electrical discharge machining. The apparatus includes an indexable table (12) and a rigid vertical frame (14) which straddles the table (12). A slide member (16) is cooperatively attached to the frame (14) so that it may move in relation thereto. A plurality of advancable and retractable heads (18, 20, 22) are associated with the slide member (16) and are adaptable for electrical discharge machining. Each head (18, 20, 22) is adjustably inclinable in a plane which lies parallel to the slide member (16). Each head (18, 20, 22) includes a rotatable, hollow electrode (24) defining an axially extending channel (28). A dielectric fluid (50) passes along the channel (28) so that machining debris may be transported away from a workpiece (11) and drilling operation may proceed in a force-free, non-contacting manner.

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