Method of forming helically corrugated tubing

Details Method of forming helically corrugated tubing Method of forming helically corrugated tubing

1976-02-20

1977-11-22

Gilden, Leon

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

By individually non-deforming clamps

72371, B21D 1114

Patent

active

040590046

ABSTRACT:
Helical corrugations are formed in a tube having a cylindrical wall by generating pressure radially of the unsupported tube wall at localized areas distributed around the tube circumference. While the radial pressure is being generated, twisting of the tube about its own axis is initiated and as a result, radial deformation of the unsupported tube wall takes place. By controlling the axial length of the tube while it is twisted, the radial deformations develop into flutes which grow axially along a selected helical path in the tube wall.

REFERENCES:
patent: 2569850 (1951-10-01), Falconer
patent: 2729266 (1956-01-01), Humphrey
patent: 3015355 (1962-01-01), Humphrey
patent: 3533267 (1970-10-01), Bunnell

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