Method for making an IC lead-frame punch

Details Method for making an IC lead-frame punch Method for making an IC lead-frame punch

1995-05-04

1996-03-12

Watts, Douglas

Metal tools and implements, making

Blank or process

29558, 761041, 83133, B21D 2810

Patent

active

054976812

ABSTRACT:
A punch for removing material from lead frames has a substantially rectangular body with an array of grooves along one side and a step removed on one end from the side opposite the grooves to provide an array of punch teeth extending from the body of the punch. The grooves provide a means of reworking the punch to provide a new array of teeth, by machining away all or part of the teeth and then extending the step in the direction of the groove to provide substantially the original length for the individual teeth. By providing a punch with groove length several times the tooth length, the punch can be reworked several times before being discarded. Methods for forming the punch and for reworking the punch after breakage or wear are disclosed.

REFERENCES:
patent: 1645895 (1927-10-01), Coenen
patent: 4399610 (1983-08-01), Moyer
patent: 4879891 (1989-11-01), Hinshau
patent: 4884331 (1989-12-01), Hinshau

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