Stamping tools

Details Stamping tools Stamping tools

1978-07-03

1980-06-03

Larson, Lowell A.

Metal deforming

By plural tool-couples

72335, 113116BB, B21D 2806

Patent

active

042055482

ABSTRACT:
Tools for stamping very delicate lead frames for semiconductor packages, including scored and bent-up tabs that retain groups of inner lead tips in position through subsequent operations, after which they are broken off. Sequential punch and die sets are used to (1) define the tabs, (2) bend down the leads, (3) score the tabs and coin the lead tips, and (4) bend the tabs up. At stations (3) and (4) means are provided to lift scored tabs out of the die and to allow the frame strip to move over the tab-bending die without interference.

REFERENCES:
patent: 1964584 (1934-06-01), Klocke
patent: 3154972 (1964-11-01), Neumeier et al.
patent: 3292412 (1966-12-01), Costabile
patent: 3580200 (1971-05-01), Cvacho
patent: 3762205 (1973-10-01), Franz et al.
patent: 3844154 (1974-10-01), Bozek
patent: 3866471 (1975-02-01), Carroll et al.
patent: 3871314 (1975-03-01), Stargell
patent: 4141712 (1979-02-01), Rogers

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