Method of forming box-like frame members

Details Method of forming box-like frame members Method of forming box-like frame members

B - Operations, Transporting

21

D

26/182

B21D 26/02 (2006.01) B21D 11/18 (2006.01)

Patent

CA 1309239

Abstract of the Disclosure 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 expan- sion. 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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