Electrical discharge machine apparatus for reverse taper bores

Details Electrical discharge machine apparatus for reverse taper bores Electrical discharge machine apparatus for reverse taper bores

2011-06-21

2011-06-21

Evans, Geoffrey S (Department: 3742)

Electric heating

Metal heating

Cutting or disintegrating

C219S069200

Reexamination Certificate

active

07964817

ABSTRACT:
An electrical discharge machining apparatus having a wire electrode and a guide system for machining reverse-taper bores in a workpiece, particularly cone-shaped bores. A guide body near the workpiece stabilizes a first portion of an electrode and a second portion of the electrode extends from the guide body terminating in a working tip. As the guide body is wobbled about the longitudinal axis of a desired workpiece bore, the electrode is advanced and the working tip of the electrode erodes progressively larger closed curves in the workpiece, resulting in a reverse taper bore in the workpiece.

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machine translation of Japan Patent document No. 2003-117,734, Sep. 2009.
PCT International Search Report—PCT/US2008/060789—Aug. 7, 2008.

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