Methods and apparatus for redrawing thin-walled container bodies

Details Methods and apparatus for redrawing thin-walled container bodies Methods and apparatus for redrawing thin-walled container bodies

1992-11-20

1994-05-31

Jones, David

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72347, B21D 2222

Patent

active

053158580

ABSTRACT:
Methods and apparatus for redrawing a drawn cup are disclosed. In particular, the methods and apparatus disclosed are directed to redrawing a container body for use in a two piece beverage container. The redraw operation uses a redraw sleeve and a redraw ring that prevent wrinkles when a thin gauge metal is employed. The wrinkles are prevented by providing cooperating displacements on the surfaces of the redraw ring and the redraw sleeve that clamp the bottom surface of the cup that is being redrawn. This displacement provides a convoluted path through which the metal is pulled during the redraw operation to increase the resistance to being drawn and the tension in the side wall, thereby substantially eliminating wrinkles.

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