Method for forming box-section frame members

Details Method for forming box-section frame members Method for forming box-section frame members

B - Operations, Transporting

21

D

26/184

B21D 22/10 (2006.01) B21D 26/02 (2006.01) B62D 25/00 (2006.01)

Patent

CA 1227921

Abstract of the Disclosure A box-like frame member is formed by deforming the sides of a tubular blank inwardly to provide it with concavely recessed portions in areas corresponding to generally opposing flat surfaces of the product. The deformed blank is expanded, under internally applied fluid pressure, within a sectional die which has its die cavity preferably no more than about 5% larger than the circumference of the blank, to avoid weakening, cracking or yielding of the blank through excessive circumferential expansion. The inward deformation of the side walls permits the blank to be confined within the sectional die without sections of the die pinching the blank on closing of the die, allows for substantially uniform expansion of the blank toward the box-like section and permits the intermediate, deformed blank and the final product to be formed with a smoothly continuous cross- sectional profile, avoiding stress concentrations in the forming procedure and in the final product which can impair the mechanical strength of the product. The tubular blank may be bent into a complex configuration, preferably before inward deformation of its side walls.

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