Method of redrawing a predrawn coated metal can

Details Method of redrawing a predrawn coated metal can Method of redrawing a predrawn coated metal can

1994-09-07

1996-08-13

Crane, Daniel C.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72347, 72350, 723794, B21D 2200

Patent

active

055445179

ABSTRACT:
A predrawn can made of a metal sheet coated with an organic film is subjected to a process which reduces its diameter and thins its walls by a high thinning ratio. The thinning is achieved by a blank holder (1), a redrawing die (3) and an ironing die (4), the reduction ratio for the ironing die being defined by ##EQU1## wherein T.sub.2 equals the thickness of the can before ironing and T.sub.3 equals the thickness after ironing, wherein the reduction ratio for the ironing die is in the range of 10 to 50%. The wall at the top end portion of the can is maintained thicker than the rest of the can wall.

REFERENCES:
patent: 4425778 (1984-01-01), Franek et al.
patent: 5105645 (1992-04-01), Kobayashi et al.
patent: 5179854 (1993-01-01), Matsui et al.
patent: 5249447 (1993-10-01), Aizawa et al.
patent: 5333484 (1994-08-01), Mine et al.
Tool Engineer's Handbook, Ironing & Redrawing (1949) example, p. 1528, American Society of Tool Engineer's.

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