Method of manufacturing a pipe having sections with different cr

Details Method of manufacturing a pipe having sections with different cr Method of manufacturing a pipe having sections with different cr

1997-02-06

1998-11-17

Hail, III, Joseph J.

Metal deforming

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

To form longitudinally-seamed tube

B21D 3902

Patent

active

058361898

ABSTRACT:
A method of manufacturing a pipe having sections with different cross-sectional configurations includes initially providing a sheet bar which has a rectangular base portion and at least one formation section integrally connected to the base portion. In the next step, the sheet bar is shaped into a hollow-cylindrical body. In this step, the base portion is deformed into a tubular shape and the formation section is deformed into a spiral shape. Subsequently, the final shaping of the pipe is carried out which may constitute widening of the formation section by a block which acts from the inside. In a subsequent joining procedure, abutting edges are connected.

REFERENCES:
patent: 4455855 (1984-06-01), Hayashi

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