Method and apparatus for manufacturing curved pipe

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

1987-03-03

1988-07-26

Combs, E. Michael

Metal deforming

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

With use of means to remove product from deflector

72166, 72369, B21D 708, B21D 912

Patent

active

047592060

ABSTRACT:
A curved pipe manufacturing method comprising steps of inserting a mandrel attached to one side of a movable block so as to be inserted into and to be pulled out from a curved cavity of a circular arc formed in a fixed die and having an entrance and an exit into the curved cavity through the exit thereof, forming a curved pipe by pressing a work, namely, a straight pipe, with a pressing rod through the entrance of the curved cavity into a curved space defined by the surface of the curved cavity and the mandrel in the shape of a curved pipe to be manufactured, turning the movable block to retract the mandrel slightly relative to a curved portion of the work after pressing the work into the curved space by a predetermined length to mitigate the pressure of contact of the curved portion of the work with the mandrel, restarting pressing the work into the curved space to complete a curved pipe, turning the movable block to pull out the mandrel from the curved pipe formed in the curved space, and further turning the movable block to press the curved pipe with an ejecting rod attached to the other side of the movable block to eject the curved pipe out from the fixed die. An apparatus for carrying out the curved pipe manufacturing method is provided.

REFERENCES:
patent: 4352281 (1982-10-01), Ragettli

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