Pressure forming and piercing a hollow body

Details Pressure forming and piercing a hollow body Pressure forming and piercing a hollow body

1996-08-16

1998-09-01

Jones, David

Metal deforming

By application of fluent medium, or energy field

With cutting

83 53, 294211, 72 56, B21D 2828

Patent

active

057995249

ABSTRACT:
A shaped and pierced hollow workpiece is made by first confining a hollow metal blank in a cavity of a die which has an inner surface and is formed with a lateral compartment. The blank is internally pressurized to press it outward against the inner surface of the cavity while forming at the compartment an outwardly projecting bulge. A tool is pressed against an outer surface of the bulge and the bulge is pressed inward so as to at least partially to invert it and press a central portion of the bulge against an opposite inside wall of the blank. A hole is then machined through the blank where the central portion of the bulge engages the opposite inside wall.

REFERENCES:
patent: 3991456 (1976-11-01), Lieser
patent: 4989482 (1991-02-01), Mason
patent: 5398533 (1995-03-01), Shimanovski et al.
patent: 5460026 (1995-10-01), Schafer
Alan D. Eldred et al; "Vari-Form -a hydroforming technique for manufacturing complex tubular components"; 1 Apr. 1994; Technische Mitteilungen Krupp; pp. 45-50.

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