Method and apparatus for manufacturing curved pipe

Details Method and apparatus for manufacturing curved pipe Method and apparatus for manufacturing curved pipe

1988-11-01

1989-10-24

Combs, E. Michael

Metal deforming

By deflecting successively-presented portions of work during...

With feeding of discrete articles or orienting of work...

72134, 72166, 72369, B21D 708, B21D 912

Patent

active

048753530

ABSTRACT:
A curved pipe manufacturing method comprises the steps of: inserting a curved mandrel into a curved cavity of a fixed die having an entrance opening and an exit opening through the exit opening thereof, said cavity being formed in a circular arc and extending from the entrance opening to the exit opening thereof, said curved mandrel being attached to one side of a movable block; forming a curved pipe by pressing a work, with a presser rod through the entrance opening of the curved cavity into a curved space defined by the surface of the curved cavity and the mandrel; turning the movable block for extracting completely the curved pipe together with the mandrel from the exit opening of the curved cavity; inserting a retaining pin into a groove provided in the movable block for retaining a tip end of the curved pipe; and further turning the movable block so as to turn the mandrel while the curved pipe is restrained by the retaining pin so that the curved pipe is separated from the mandrel. An apparatus for carrying out the curved pipe manufacturing method is also provided.

REFERENCES:
patent: 4352281 (1982-10-01), Ragettli
patent: 4759206 (1988-07-01), Kaneko

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