Method of forming tubes or pipes

Details Method of forming tubes or pipes Method of forming tubes or pipes

1978-01-09

1979-04-17

Combs, E. M.

Metal deforming

Process

Tube making or reshaping

113116UT, B21D 5110

Patent

active

041493990

ABSTRACT:
In a method of forming tubes or pipes from a flat blank of a plastically deformable material, three spaced apart portions of the blank are first bent to the wanted curvature of the finished tube or pipe, so that two smaller unbent portions are obtained between the curved portions. Then, the blank is closed to essentially tubular form by means of forces acting on the curved portions, so that the principal deformation in connection with the closing is obtained in the unbent portions located between the curved portions.

REFERENCES:
patent: 786923 (1905-04-01), Smith
patent: 1866257 (1932-07-01), Heineman
patent: 3166827 (1965-01-01), Bushi
patent: 3693398 (1972-09-01), Pedersen

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