Method of forming reinforced box-section frame members

Details Method of forming reinforced box-section frame members Method of forming reinforced box-section frame members

B - Operations, Transporting

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26/184

B21D 26/02 (2006.01) B21D 11/10 (2006.01) B21D 11/18 (2006.01) B21D 53/88 (2006.01)

Patent

CA 1314133

ABSTRACT Forming hollow, box-section, frame members which include localized reinforcement. The frame members are produced by fitting a sleeve about a tube, deforming the tube and sleeve to avoid the occurrence of pinching on closing of die sections about the deformed tube and sleeve in a sectional die, and then expanding the tube and sleeve in the die to form the hollow, box-section, frame member in which the sleeve is mechanically locked on an inward- ly offset intermediate portion of the tube. The expansion is achieved by application of an internal pressure within the tube.

572582

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