Non-immersion EDM method and apparatus

Details Non-immersion EDM method and apparatus Non-immersion EDM method and apparatus

1982-11-09

1985-09-03

Envall, Jr., Roy N.

Electric heating

Metal heating

Cutting or disintegrating

219 69D, B23P 108/1, B23P

Patent

active

045394580

ABSTRACT:
A novel EDM method and apparatus for forming a relatively large cavity in a workpiece with a tool electrode complementary in shape with the cavity. Unlike the conventional EDM arrangement in which the machining gap is deeply immersed in a dielectric fluid in a worktank, the machining gap according to the invention is defined so as to be substantially contiguous to the atmospheric air in the worktank. The gap is supplied with a water-based machining liquid which, upon entraining gap discharge products, is allowed to scatter into the atmospheric air in the worktank so that substantially no debris of the discharge products stagnates in the machining gap, thereby assuring an enhanced machining efficiency.

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