Deep drawing of cup-shaped article for easy removal from punch

Details Deep drawing of cup-shaped article for easy removal from punch Deep drawing of cup-shaped article for easy removal from punch

1975-02-03

1976-08-03

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

With stripping or ejecting from tool

72349, B21D 4500

Patent

active

039722171

ABSTRACT:
A method and apparatus for deep drawing a cup-shaped article in which a blank is placed on a punch and the punch is passed through a series of deep drawing dies, so that the force required to strip the drawn cup-shaped article from the punch is substantially less than in a conventional method. After the deep drawing is completed, the cup-shaped article is slightly drawn to the final desired dimensions by a drawing step in which the wall thickness of the article is reduced no more than 10%. This is carried out by a slight drawing die spaced from the last of the series of deep drawing dies, preferably a distance at least half the height dimension of the finished deep drawn cup-shaped article.

REFERENCES:
patent: 2011907 (1935-08-01), Peters
patent: 2168300 (1939-08-01), Lemming
patent: 2412813 (1946-12-01), Keller

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