Process for stretch forming hollow metal bodies

Details Process for stretch forming hollow metal bodies Process for stretch forming hollow metal bodies

1997-03-18

1998-04-14

Crane, Daniel C.

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72296, B21D 1102

Patent

active

057379530

ABSTRACT:
A process for stretch forming hollow metal bodies, such as aluminum alloy extrusions. The extrusions are stretched longitudinally, bent transversely of the pulling direction, and then subjected to pressure from an incompressible fluid in a hollow interior. In a preferred embodiment, the incompressible fluid is water at a pressure sufficient to deform at least part of the extrusion outwardly of its hollow interior. The incompressible fluid reduces dimensional distortions in the shaped product.

REFERENCES:
patent: 4704886 (1987-11-01), Evert et al.
patent: 4788843 (1988-12-01), Seaman
patent: 4827753 (1989-05-01), Moroney
patent: 4970886 (1990-11-01), Sikora et al.
patent: 5327764 (1994-07-01), Weykamp
patent: 5349839 (1994-09-01), Weykamp et al.

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