Bulge forming method and apparatus

Details Bulge forming method and apparatus Bulge forming method and apparatus

1997-04-09

1999-07-27

Jones, David

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72 62, B21D 915

Patent

active

059271191

ABSTRACT:
According to a hydraulic bulge forming method, a bend pipe is inserted in a cavity, and when the bend pipe is subjected to bulge forming, the bend pipe is elastically deformed by supplying a pressure medium to an interior of the bend pipe so that an inside of the bent portion is bulged along a bulging region formed at a portion of the cavity corresponding to an inside of a bent portion of the bend pipe. Whereby a reduction in a wall thickness of the outside portion of the bent portion is suppressed, so that a danger of causing breaking can be prevented.

REFERENCES:
patent: 1542983 (1925-06-01), Bergmann, Jr.
patent: 3247581 (1966-04-01), Pellizzari
patent: 5303570 (1994-04-01), Kaiser
patent: 5481892 (1996-01-01), Roper et al.

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