Method of making blanking dies and punches having rounded edges

Details Method of making blanking dies and punches having rounded edges Method of making blanking dies and punches having rounded edges

1993-08-10

1995-04-04

Watts, Douglas D.

Metal tools and implements, making

Blank or process

Die

219 6917, B23P 1524, B23H 106, B23H 100

Patent

active

054026920

ABSTRACT:
A method of electrical discharge machining a curvature onto the cutting edge of a punch or die. An electrode has a cross-section that is identical in shape as the cross-section of the punch or an opening of the die to be machined. The electrode is centered relative to the punch or die; an electrical charge is applied to the electrode; the electrode is moved in a small orbital path, without changing the orientation of the electrode; and the electrode is translated along its axis while simultaneously varying the diameter of the orbital path of the electrode in time relation with the translation of the electrode along its axis, thereby electrical discharge machining the curvature onto the cutting edge of the punch or die.

REFERENCES:
patent: 3564190 (1971-08-01), Kandajan et al.
patent: 4400606 (1983-08-01), Itoh et al.
patent: 4431897 (1984-02-01), Itoh
patent: 4736056 (1988-04-01), Futamura
4 pages of Brochure on Roboform 40 by Charmilles Technologies of Geneva, Switzerland.
2 pages from Micro Tool, Inc. on Micro's Corner Rounding Cutters.

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