Method for removing strain from press-formed workpiece, and...

Details Method for removing strain from press-formed workpiece, and... Method for removing strain from press-formed workpiece, and...

2005-03-01

2005-03-01

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

C072S350000

Reexamination Certificate

active

06860135

ABSTRACT:
In a forming press, a blank is pressed formed into a press-formed workpiece by means of an upper die and a lower die, while a peripheral edge portion of the blank is clamped by means of a die and a blank holder insert of the forming press. Subsequently, a central portion of the press-formed workpiece is partially held by means of the upper die and the lower die so as to draw a peripheral portion of the press-formed workpiece away from the central portion thereof, thereby removing strain from the press-formed workpiece.

REFERENCES:
patent: 1035984 (1912-08-01), Malde
patent: 5823040 (1998-10-01), Stodd
patent: 6276185 (2001-08-01), Owens
patent: 6508096 (2003-01-01), Carlile
patent: 198 42 750 (2000-04-01), None
patent: 198 53 130 (2000-05-01), None
patent: 1 136 149 (2001-09-01), None
patent: 4-190931 (1992-07-01), None
patent: 2001-259752 (2001-09-01), None

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