Apparatus and method for forming cup-shaped members

Details Apparatus and method for forming cup-shaped members Apparatus and method for forming cup-shaped members

1998-06-08

2000-01-18

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72349, 72350, B21D 2220

Patent

active

060148837

ABSTRACT:
Apparatus and method for forming cup-shaped metal members from a flat metal sheet in a press having a ram which moves a cut edge, draw horn and draw pad towards a base holding a blank and draw die. The draw pad is formed with an annular outer rib which engages an opposed clamping surface of the die upon the peripheral edge of a disc blank moving around an inner radius of the die and into a cup forming cavity to maintain a space between the clamping surfaces of the draw pad and die of between 50% and 95% the thickness of the metal sheet to reduce excess pinching of the peripheral edge of the disk blank as it moves around the die radius as the draw horn draws the disk blank into the cup-shaped member.

REFERENCES:
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patent: 4796454 (1989-01-01), Bulso, Jr. et al.
patent: 5333484 (1994-08-01), Mine et al.
patent: 5477723 (1995-12-01), Kergen
patent: 5626048 (1997-05-01), McClung
patent: 5628224 (1997-05-01), McClung et al.
patent: 5634366 (1997-06-01), Stodd

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