Method for forming a complex-shaped tubular structure

Metal working – Method of mechanical manufacture – Structural member making

Reexamination Certificate

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C029S421100, C029S525140, C072S054000, C072S368000, C072S370220

Reexamination Certificate

active

07484298

ABSTRACT:
A method is provided for forming a complexly-shaped tubular structure such as a tapered pillar or other structure for a vehicle body. A sheet metal blank having a longitudinal axis is rolled about the longitudinal axis to form a tubular shape and the side edges of the blank are then welded together to form a tube. The tube is then enclosed in a hydroforming die and pressurized to conform the tube to the shape of the die and thereby form the desired complex shape. The sheet metal blank may be formed by the end-to-end welding together of a plurality of separate sheet metal blanks that differ from one another in characteristic including material thickness, material alloy composition, and/or coating. One or more of the blanks can have side edges that are non-parallel so that the tube will taper in diameter along its length.

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patent: 5339667 (1994-08-01), Shah et al.
patent: 5398533 (1995-03-01), Shimanovski et al.
patent: 5924316 (1999-07-01), Streubel et al.
patent: 6182487 (2001-02-01), Komiya et al.
patent: 6623067 (2003-09-01), Gabbianelli et al.
patent: 6842957 (2005-01-01), Van Giezen
patent: 2003/0159289 (2003-08-01), Van Giezen
patent: 2005/0257587 (2005-11-01), Tomizawa et al.
patent: 2005/0257591 (2005-11-01), Hauger et al.

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