Metal deforming – Process – Tube making or reshaping
Patent
1990-05-15
1992-07-14
Spruill, R. L.
Metal deforming
Process
Tube making or reshaping
72 61, 72360, B21D 2210
Patent
active
RE0339903
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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Patent Abstracts of Japan, vol. 11, No. 69 (C-407) [2516] Mar. 3, 1987.
Isachenkov, E. I., Molding by Rubber and Liquid, Mashinostroenie, Moscow, 1967.
Gurley Donald
Spruill R. L.
TI Corporate Services Limited
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