Method and apparatus for hydroforming metallic tube

Details Method and apparatus for hydroforming metallic tube Method and apparatus for hydroforming metallic tube

1998-04-22

1999-07-06

Jones, David

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72 62, B21D 2602

Patent

active

059184949

ABSTRACT:
A method and apparatus for hydroforming a metallic tube including the steps of: preliminarily expanding the metallic tube over an axial section longer than the length of the expanded portion of a final product as measured in the axial direction of the metallic tube; and compressing the preliminarily expanded portion in the axial direction of the metallic tube so as to form the shape of the expanded portion of the final product. According to the method and apparatus of the invention, frictional resistance between the metallic tube and processing tools can be reduced, and moreover, the internal pressure within the metallic tube can be reduced during expansion processing. Furthermore, the cost for the manufacture of metallic die is reduced, and in addition, yield is improved

REFERENCES:
patent: 2631640 (1953-03-01), Zallea
patent: 3335590 (1967-08-01), Early
patent: 3974675 (1976-08-01), Tominaga
patent: 4317348 (1982-03-01), Halene et al.
patent: 4748836 (1988-06-01), Hoeboer et al.
patent: 5214948 (1993-06-01), Sanders et al.
patent: 5388440 (1995-02-01), Folmer

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