Method of redrawing flanged cup

Details Method of redrawing flanged cup Method of redrawing flanged cup

1990-11-13

1992-01-28

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

723794, B21D 2220

Patent

active

050834495

ABSTRACT:
Disclosed is a redrawing method in which a preliminarily drawn cup having a flange is engaged with a flange-correcting die arranged coaxially with a blank holder to surround the blank holder with a small distance from the peripheral face of the blank holder before the residual flange of the preliminarily drawn cup is introduced into a clearance between the blank holder and a redrawing die, and the preliminarily drawn cup is redrawn in this state. The flange-correcting die has a working face, the inner diameter of which is gradually decreased, and the distance of from the peripheral face of the cup on the tangential line of the working face to the point of the contact with the working face is substantially constant at least in the introduction side portion of the working face. According to this redrawing method, a draw-redraw-formed can having an excellent shape or dimensional precision can be obtained without occurrence of troubles such as edge breaking of the material, breaking of the coating and formation of an enamel hair.

REFERENCES:
patent: 4962659 (1990-10-01), Imazu et al.

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