Method and apparatus for sheet forming a blank using a variable

Details Method and apparatus for sheet forming a blank using a variable Method and apparatus for sheet forming a blank using a variable

1996-07-17

1999-05-11

Hail, III, Joseph J.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

723792, B21D22/00

Patent

active

059015993

ABSTRACT:
A sheet forming method including the steps of: holding a blank between a blank holder and an opposing die so that wrinkling is prevented in the blank; and forming the blank to an objective shape with a punch, while imposing a force of a variable bead on the blank at a selected position in a point manner and only during a part of the entire forming period selectively. An apparatus for conducting the above method.

REFERENCES:
patent: 2312749 (1943-03-01), Bullock
patent: 3263637 (1966-08-01), Cox
patent: 4195510 (1980-04-01), Juergens
patent: 4432222 (1984-02-01), Ujihara et al.
patent: 5157969 (1992-10-01), Roper
patent: 5372027 (1994-12-01), Roper et al.

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