Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1998-07-21
2000-08-22
Jones, David
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
72 61, 294211, B21D 3908, B21D 2602
Patent
active
061054097
ABSTRACT:
A method for hydroforming a metallic tube comprising primary hydroforming and secondary hydroforming, wherein in the primary hydroforming step, the metallic tube is formed such that a circumferential length of an expanded portion of the primary-hydroformed tube as measured at a wall center region of the expanded portion becomes substantially equal to or slightly shorter than a circumferential length of an expanded portion of a product as measured at a wall center region of the expanded portion, and in the secondary hydroforming step, movable pads incorporated in the dies press the expanded portion formed through primary hydroforming so as to finish the cross-sectional profile of the expanded portion into that of the expanded portion of the product, and said primary hydroforming and secondary hydroforming are continuously performed within the dies. Also disclosed is an apparatus for performing the hydroformation method. According to the method of the present invention, high liquid pressure is not required, and reduction in wall thickness and shape defects can be revented.
REFERENCES:
patent: 5561902 (1996-10-01), Jacobs et al.
patent: 5802899 (1998-09-01), Klaas et al.
patent: 5890387 (1999-04-01), Roper et al.
E.I. Isachenkov, D.Sc., "Molding by Rubber and Liquid", 2nd Revised and Supplemented Edition Mashinostroenie, pp. 317-321, 1967.
Inoue Saburo
Kojima Masayasu
Jones David
Sumitomo Metal Industries Ltd.
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