Metal tools and implements – making – Blank or process – Die
Patent
1983-10-07
1986-04-01
Crane, Daniel C.
Metal tools and implements, making
Blank or process
Die
72325, 1566591, 156656, 156645, B21K 520
Patent
active
045790221
ABSTRACT:
The invention provides a novel method for manufacturing a knife-edge die for stamping out a metal foil on an insulating base plate such as in the preparation of an electronic circuit board by a technique of photoetching. The method comprises a line pattern of a photoresist film on the die face corresponding to the contour of the desired pattern, subjecting the die face to a first etching to effect substantial side etching behind the photoresist film to leave an edge, removing the photoresist film and subjecting the die face to a second etching to sharpen the edge into a knife edge. The invention further proposes several improvements in the knife-edge die manufactured in the same principle of the method as above such as the adjustment of the depth of the inside recess surrounded by the knife edge with a filling material and knife-edge dies suitable for continuous stamping out provided with one or more of flat-headed presser dies for the preliminary bonding of the metal foil to the base plate prior to stamping out with the knife edge and one or more limiter dies provided on one or both sides of the knife edge in order to prevent unduly deep incision of the knife edge to the base plate.
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Kasai Yasuo
Koguchi Masahiro
Sakuma Teruo
Yamada Koichi
Crane Daniel C.
Fujikura Cable Works Ltd.
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