Structure and method facilitating stripping of seamless can body

Details Structure and method facilitating stripping of seamless can body Structure and method facilitating stripping of seamless can body

1975-03-17

1976-02-10

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

With stripping or ejecting from tool

72208, 72349, B21D 4500

Patent

active

039370470

ABSTRACT:
In the manufacture of drawn and ironed, unitary, can bodies, structure and method which interrupt surface contact between an ironing mandrel and the interior sidewall of a can body being ironed to reduce friction for removal of the ironed can body from the mandrel.
During passage through an ironing ring, sidewall metal is moved into a narrow-width, linearly-extended indentation in the mandrel sidewall. The metal of the protrusion thus formed on the interior surface of the can body is moved along the mandrel sidewall during passage through a subsequent ironing ring, with such movement breaking surface adhesion between the mandrel sidewall and the interior surface of the container body sidewall to facilitate removal.

REFERENCES:
patent: 2397544 (1946-04-01), Garand
patent: 2412813 (1946-12-01), Keller

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