Process for manufacturing strip lead frames

Details Process for manufacturing strip lead frames Process for manufacturing strip lead frames

1976-10-07

1977-10-25

Combs, E. M.

Metal deforming

With 'coating' of work

Metal coating

72700, 228117, B21B 4500

Patent

active

040550621

ABSTRACT:
There is disclosed a process for producing strip material useful for making lead frames which includes preparing a ferritic stainless steel substrate as a thin strip and, before subjecting it to finish rolling, electroplating it with a first layer of copper and an outside layer of nickel or tin, after which the strip is precision rolled to final gauge. There is also disclosed the product from this process which is a precision rolled strip having a core of ferritic stainless steel and a continuous surface layer of nickel or tin with an intermediate layer of copper.

REFERENCES:
patent: 2490700 (1949-12-01), Nachtman
patent: 2718690 (1955-09-01), Ulam
patent: 3076260 (1963-02-01), Roehl
patent: 3249409 (1966-05-01), McLeod
patent: 3749558 (1973-07-01), Dillenschneider
patent: 3921886 (1975-12-01), Ford et al.
patent: 3978803 (1976-09-01), Asano et al.
patent: 3997099 (1976-12-01), Morisaki

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