Pipe end expanding or contracting process utilizing ironing

Details Pipe end expanding or contracting process utilizing ironing Pipe end expanding or contracting process utilizing ironing

1979-06-29

1981-11-03

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72370, B21D 2200

Patent

active

042978670

ABSTRACT:
A process and a device for expanding or contracting the end of a pipe are disclosed. First an ironing die or punch is put over or into the end of the pipe. Then the end of the pipe is expanded or contracted by a rod form expanding punch or a tube form reducing die. Then, with this punch or die still in place, the ironing die or punch is pulled over or through the end of the pipe, so as to pinch the wall of the pipe between itself and the punch or die, and thereby the wall of the pipe is ironed so as to release any strains that may have been caused in it by the expanding or contracting process. Thereby more accurate pipe ends can be formed simply and reliably.

REFERENCES:
patent: 983849 (1911-02-01), Wales
patent: 1000122 (1911-04-01), Reynolds
patent: 1059354 (1913-04-01), Ehrardt
patent: 1283692 (1918-11-01), Debendetti
patent: 1647447 (1927-11-01), Hartnett
patent: 2391766 (1945-12-01), Barnhart
patent: 3566662 (1971-03-01), Champoux
patent: 3738146 (1973-06-01), Gunn
patent: 4134287 (1979-01-01), Muede et al.

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