Method and apparatus for manufacturing a hollow body from a tubu

Details Method and apparatus for manufacturing a hollow body from a tubu Method and apparatus for manufacturing a hollow body from a tubu

1999-03-25

2000-09-05

Jones, David

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72 61, 7237022, B21D 2602

Patent

active

061125679

ABSTRACT:
The invention relates to a method for shaping a hollow body from a tubular blank inserted into a shaping tool that can be opened and closed, by internal high pressure introduced into the interior of the blank. The cross section of the blank, prior to the internal high-pressure shaping, can be changed and pre-shaped from a round or rectangular shape, depending on the workpiece. In order to be able to produce workpieces with a circumference that varies considerably over the length without overstretching the material, according to the invention, for pre-shaping the blank, a dent that differs in depth over its length is formed in the blank. During the internal high-pressure shaping of the pre-shaped blank to form a hollow body, a U-shaped fold is formed from the dent that projects into the interior of the hollow body, with the walls of the fold abutting one another directly and merging at the periphery with the circumferential wall of the hollow body. The two walls of the fold are permanently connected to one another and the two walls of the fold are preferably permanently welded together in the vicinity of the circumference of the hollow body.

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