Metal deforming – By use of non-deforming work-gripping clamp and relatively... – By individually non-deforming clamps
Patent
1977-09-29
1979-10-23
Larson, Lowell A.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
By individually non-deforming clamps
72371, B21D 1504
Patent
active
041716345
ABSTRACT:
Helically corrugated tubing with corrugations that have a gradually changing pitch from one end to the other is manufactured in a twisting machine by rotating one end of a deformable tube about the tube axis relative to the opposite end and simultaneously applying axially directed forces to the tube to progressively develop helical corrugations along the tube wall. The ratio of the torque and the axially directed forces applied to the tube is continuously varied to produce corresponding variations in the pitch of the corrugations. Tubing sections in which the pitch of the corrugations increases gradually from one end to the other are used in shell-and-tube or tube-in-tube heat exchangers and define flow paths having cross sectional areas which increase correspondingly.
REFERENCES:
patent: RE24783 (1960-02-01), Humphrey
patent: 2876616 (1959-03-01), Austin, Jr. et al.
patent: 3015355 (1962-01-01), Humphrey
patent: 3117471 (1964-01-01), O'Connell et al.
patent: 3533267 (1970-10-01), Bunnell
patent: 3722203 (1973-03-01), Akachi
patent: 3777343 (1973-12-01), D'Onofrio
patent: 4059004 (1977-11-01), Perkins
Larson Lowell A.
Spiral Tubing Corporation
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