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

1994-07-01

1997-07-15

Rachuba, M.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72348, B21D 2221

Patent

active

056472420

ABSTRACT:
New technology for fabricating a one-piece cup-shaped 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 a planar blank and cup-shaped work product 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. In a flat-rolled steel embodiment, one-piece can bodies for carbonated beverage packs require less metal than that currently being used to produce the commercially drawn and ironed product from flat-rolled steel, and can body finishing steps are diminished.

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patent: 4425778 (1984-01-01), Franek et al.
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patent: 5014536 (1991-05-01), Saunders
patent: 5119657 (1992-06-01), Saunders
patent: 5347839 (1994-09-01), Saunders

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