Forming fastener mold cavities by electro-discharge machining

Details Forming fastener mold cavities by electro-discharge machining Forming fastener mold cavities by electro-discharge machining

1997-09-23

1999-07-13

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 692, B23H 100, B23H 900

Patent

active

059222220

ABSTRACT:
An apparatus and electro-discharge machining method for making fastener-shaped mold surfaces in mold plates for making a mold for molding a fastener product having an array of fastener elements. An electro-discharge is created between an electrode and a stack of sheet-form blanks of plate material such that material is removed from the blanks to produce mold plates, each mold plate having a series of fastener element-shaped mold surfaces extending inwardly from an outer edge of the plate. Extremely small tip radii (e.g., less than 0.001 inch) can be produced with the invention. Since a multitude of finished mold plates can be formed at once, the invention is extremely cost effective in producing mold plates with accurately-formed mold surfaces.

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