Method and apparatus for manufacturing metallic pipe

Details Method and apparatus for manufacturing metallic pipe Method and apparatus for manufacturing metallic pipe

1977-04-21

1978-10-31

Combs, E. M.

Metal deforming

By tool-couple pressing together adjacent surface portions...

To form longitudinally-seamed tube

72178, 72181, 72368, B21D 3902, B21D 512

Patent

active

041226968

ABSTRACT:
In a method and an apparatus for manufacturing a metal pipe wherein a flat strip or skelp is formed into a cylindrical pipe while being fed in its longitudinal direction by a forming mill having a prefinishing stand, a train of forming stands for forming the skelp with a U-shaped cross section, and a train of finishing stands, the improvement wherein both edge surfaces of the skelp are caused to contact in substantially point contact recess-defining surfaces of concave V-shaped recess in pairs of forming rolls, the respective rolls which are disposed symmetrically in a plane normal to the pass line as the skelp moves through the train of forming stands along the line, and the skelp has a bending load applied by the forming rolls so as to form the skelp into a U-shaped skelp. According to this method and apparatus, there is no need to change the forming rolls even if the diameter or wall thickness of the pipe to be manufactured are changed, and also since the skelp edge is held, during the forming process, at positions in a plane normal to the pass direction by the surfaces of the concave recesses, the skelp is not twisted around the pass line so that threading of the forming mill can be carried out accurately and easily.

REFERENCES:
patent: 672689 (1901-04-01), Whitehouse
patent: 1989059 (1935-01-01), Kurtze
patent: 2007284 (1935-07-01), Rafter
patent: 2012795 (1935-08-01), Park
patent: 2037608 (1936-04-01), Walker
patent: 2098989 (1937-11-01), Yoder

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