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

1997-05-30

1999-11-23

Scherbel, David A.

Metal deforming

By use of tool acting during relative rotation between tool...

With modification or control of temperature of work, tool or...

72349, B21D 2221

Patent

active

059879513

ABSTRACT:
New technology for fabricating a one-piece cup-shaped can body which 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 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.

REFERENCES:
patent: 3348511 (1967-10-01), Cowles
patent: 4485663 (1984-12-01), Gold et al.
patent: 4559802 (1985-12-01), Budrean et al.
patent: 4584859 (1986-04-01), Saunders
patent: 4711611 (1987-12-01), Bachmann et al.
patent: 4962659 (1990-10-01), Imazu et al.

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