Pipes and tubular conduits – Distinct layers – Bonded to each other
Reexamination Certificate
2006-05-30
2006-05-30
Hook, James (Department: 3754)
Pipes and tubular conduits
Distinct layers
Bonded to each other
C138S114000, C072S367100, C072S061000
Reexamination Certificate
active
07051768
ABSTRACT:
When hydroforming a steel pipe, a tubular deformation assisting member made of an incompressible material softer than the steel pipe is fitted on the outer peripheral surface of the steel pipe. The deformation assisting member is attached at least to an area corresponding to a projection provided at the inner surface of the die assembly, the projection being earliest brought into contact with the outer peripheral surface of the steel pipe during hydroforming. When hydroforming the steel pipe, the material of the deformation assisting member plastically flows near corner portions at which the deformation assisting member is brought into contact with the projection.
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Birch Stewart Kolasch & Birch
Hook James
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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