Method of manufacturing twisted tubes

Details Method of manufacturing twisted tubes Method of manufacturing twisted tubes

1981-08-21

1984-03-20

Crane, Daniel C.

Metal deforming

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

By individually non-deforming clamps

72342, 72371, B21D 700, B21D 1114

Patent

active

044373295

ABSTRACT:
A method of manufacturing a spiral tube including the steps of positioning an elongated mandrel within a tube, grasping the ends of the tube, forming a point of reduced resistance to torsional force in the wall of the tube, rotating one end of the tube while the other end is held stationary to cause the formation of a spiral groove in the tube, the mandrel defining the minimum interior diameter of the spiral tube so formed, and advancing the means grasping the tube towards each other to compensate for the reduction of length of the tube as the spiral groove therein is formed, and maintaining at least the area of the tube at which the spiral groove is being formed at an elevated temperature.

REFERENCES:
patent: 825511 (1906-07-01), Blondell
patent: 1095324 (1914-05-01), Hall
patent: 2667852 (1954-02-01), Brown, Jr.
patent: 2881822 (1959-04-01), Henry
patent: 3117471 (1964-01-01), O'Connell et al.
patent: 3198926 (1965-08-01), Melmoth
patent: 3198928 (1965-08-01), Allison
patent: 3533267 (1970-10-01), Bunnell
patent: 4188813 (1980-02-01), Bournicon et al.

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