Method for forming multistage hollow pipe

Details Method for forming multistage hollow pipe Method for forming multistage hollow pipe

1991-05-07

1993-05-18

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

Plural or complex apparatus

72305, 72311, 72357, 72367, 72370, B21D 1506

Patent

active

052110460

ABSTRACT:
An apparatus of and a method for forming a multistage hollow pipe comprising the steps of arranging a hollow pipe on a plurality of molds composed of an upper mold, first, second, third forming molds for subjecting the hollow pipe to drawing process, axially applying a compressive force, which is greater than the force forming multistage bulges on the hollow pipe, to the hollow pipe for forming the multistage hollow pipe, removing the processed multistage hollow pipe and other molds from the first forming mold, releasing the clamping of the processed multistage hollow pipe by the second and the third forming molds, and taking out the processed multistage hollow pipe.

REFERENCES:
patent: 616764 (1898-12-01), Bourke
patent: 2541869 (1951-02-01), Grant
patent: 2581787 (1952-01-01), Dreyer
patent: 2759379 (1956-08-01), Brandt
patent: 3864956 (1975-02-01), Barry
patent: 4289007 (1981-09-01), Kraft
patent: 4319471 (1982-03-01), Benteler

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