Method of forming reinforced box-selection frame members
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United States of America Patent
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Jul 26, 1988
Grant Date -
N/A
app pub date -
Aug 27, 1987
filing date -
Aug 27, 1987
priority date (Note) -
Expired
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Abstract
This invention relates to a method of 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 frictional drag in a final die, and then expanding the tube and sleeve in a final die to form the hollow, box-section, frame member. The expansion is achieved by application of an internal pressure within the tube.
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