Method and apparatus for forming container end panels

Details Method and apparatus for forming container end panels Method and apparatus for forming container end panels

1986-10-30

1987-12-22

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72336, B21D 5144

Patent

active

047139587

ABSTRACT:
A method of forming container end panels includes first forming the bottom outer panel and then preliminarily forming the chuckwall and countersink radius by pulling material from the peripheral edge area with a punch core. The countersink radius is finally formed by partially retracting the punch core from the radius while holding the chuckwall to wrap some of the material in the radius upwardly. The apparatus includes an outer punch core with a tapered nose which preliminarily forms the chuckwall and countersink radius and then is retractable from the radius while holding the wall during final forming of the radius.

REFERENCES:
patent: 368821 (1887-08-01), Edmands
patent: 2239897 (1941-04-01), Lyon
patent: 3902347 (1975-09-01), Ridgway et al.
patent: 4109599 (1978-08-01), Schultz
patent: 4567746 (1986-02-01), Bachmann et al.
patent: 4571978 (1986-02-01), Taube et al.
patent: 4587825 (1986-05-01), Bulso, Jr. et al.
patent: 4587826 (1986-05-01), Bulso, Jr. et al.

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