Stretch forming metal bodies with polymeric internal mandrels

Details Stretch forming metal bodies with polymeric internal mandrels Stretch forming metal bodies with polymeric internal mandrels

1997-04-15

1998-04-07

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

By individually non-deforming clamps

72 57, 72370, 72465, 294211, B21D 901

Patent

active

057351600

ABSTRACT:
A hollow metal body is shaped by a process including simultaneous stretching and bending. The body is stretched longitudinally by pulling end portions in opposite directions with sufficient force to exceed an elastic limit and to initiate elongation through plastic deformation. While the body is being stretched longitudinally, it is bent between its end portions transversely of the direction of pulling. Solid polymeric first and second mandrels are inserted into end portions of the body to prevent collapse during bending.

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