Method of redrawing metal cup

Details Method of redrawing metal cup Method of redrawing metal cup

1990-11-13

1992-04-21

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

723794, B21D 2228

Patent

active

051056453

ABSTRACT:
Disclosed is a method of redrawing a metal cup, in which an annular working member is used together with a redrawing die, a redrawing punch and a cup-shaped holding member, and this annular working member has a working face having an inner diameter smaller than the outer diameter of a preliminarily drawn cup to be redrawn. If redrawing is carried out by using this annular working member, the thickness of the drawn cup can be uniformly and sufficiently reduced without damaging a metal sheet of the preliminarily drawn cup or a coating layer thereof.

REFERENCES:
patent: 1942930 (1934-01-01), Ludington
patent: 4425778 (1984-01-01), Franek et al.

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