Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1985-03-19
1986-02-04
Gilden, Leon
Metal deforming
By application of fluent medium, or energy field
Using fixed die
29421R, 72 62, B21D 2210
Patent
active
045677433
ABSTRACT:
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.
REFERENCES:
patent: 1210629 (1917-01-01), Foster
patent: 3768288 (1973-10-01), Jury
patent: 4125937 (1978-11-01), Brown et al.
patent: 4238878 (1980-12-01), Stamm et al.
patent: 4305269 (1981-12-01), Kimura
Gilden Leon
Standard Tube Canada Inc.
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