EDM process for manufacturing reverse tapered holes

Details EDM process for manufacturing reverse tapered holes EDM process for manufacturing reverse tapered holes

2007-02-28

2009-08-11

Evans, Geoffrey S (Department: 3742)

Electric heating

Metal heating

Cutting or disintegrating

C205S665000

Reexamination Certificate

active

07572997

ABSTRACT:
A electrical discharge machining apparatus is disclosed. The apparatus may have an electrode, an actuator configured to advance the electrode, and a power supply. The apparatus may also have a controller in communication with the actuator and the power supply. The controller may be configured to negatively charge the electrode, and regulate the actuator to advance the negatively charged electrode toward a positively charged workpiece, thereby initiating erosion of the positively charged workpiece. The controller may also be configured to positively charge the electrode and negatively charge the workpiece to erode the electrode to a desired condition after workpiece erosion has been initiated. The controller may also be configured to continue advancing the electrode toward the workpiece after the electrode has been eroded to the desired condition.

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C. Diver et al.,Micro-EDM drilling of tapered holes for industrial applications, Journal of Materials Processing Technology 149 (2004) 296-303.

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