Fabricating one-piece can bodies with controlled side wall elong

Details Fabricating one-piece can bodies with controlled side wall elong Fabricating one-piece can bodies with controlled side wall elong

1990-10-12

1994-09-06

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72348, B21D 2221

Patent

active

053437292

ABSTRACT:
New technology for fabricating a one-piece cup-shaped can body having a protective organic coating as formed. Such can body is formed free of side wall ironing from can stock comprising flat-rolled sheet metal substrate precoated with protective organic coating and forming lubricant. A plurality of successive diameter-reduction operations are carried out on a planar blank and cup-shaped work product under tension during which side wall height is increased and side wall substrate is decreased in thickness to provide controlled uniformity in side wall substrate thickness over about 85% to about 95% of side wall height for such can body. The fabricating tooling provides for a preselected clearance between a punch peripheral wall and a die cavity internal wall in each of such plurality of diameter-reduction operations to achieve a desired decrease in side wall thickness as the precoated substrate is moved into a die cavity by relative movement of its respective punch.

REFERENCES:
patent: 4413440 (1983-11-01), Phalin et al.
patent: 4414836 (1983-11-01), Saunders
patent: 4425778 (1984-01-01), Franek et al.
patent: 4452375 (1984-06-01), Marcus
patent: 4584859 (1986-04-01), Saunders
Definition Of Metallurgical Terms; copyright 1977 by American Society For Metals; p. 29.
Die Design and Diemaking Practice; copyright 1941; pub. by The Industrial Press; p. 536.

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