Method of forming box-like frame members
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United States of America Patent
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May 17, 1988
Grant Date -
N/A
app pub date -
May 6, 1987
filing date -
May 6, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A box-like frame member is formed by compressing an internally-pressurized tubular blank within a die having a cavity conforming to the final box-like cross section desired for the product, and increasing the pressure to exceed the yield limit of the wall of the blank to expand the blank into conformity with the die cavity. The blank is selected so that the final product and the die cavity have a circumference preferably no more than about 5% larger than the circumference of the blank, to avoid weakening or cracking of the blank through excessive circumferential expansion. The internal pressure forces the blank evenly into the corners of the die on closing and allows the blank to be confined within the die without sections of the die pinching the blank on closing of the die.
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