Metal working – Method of mechanical manufacture – Structural member making
Reexamination Certificate
2006-02-21
2009-02-03
Cozart, Jermie E (Department: 3726)
Metal working
Method of mechanical manufacture
Structural member making
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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Benton Paul A.
Bruggemann Charles J.
Goebel Mark
Lendway, IV Joseph M.
Mellas Spyros P.
Cozart Jermie E
GM Global Technology Operations Inc.
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