Corrugated tubing with variable depth corrugations and method of

Details Corrugated tubing with variable depth corrugations and method of Corrugated tubing with variable depth corrugations and method of

1978-10-03

1980-05-20

Keenan, Michael J.

Metal deforming

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

By individually non-deforming clamps

72371, B21D 1500

Patent

active

042033128

ABSTRACT:
Helically corrugated tubing with corrugations of variable depth is manufactured in a twisting machine by rotating one end of a deformable tube relative to the opposite end and simultaneously applying axially directed forces to the tube to progressively develop the helical corrugations in the tube wall. The depth of the corrugations is varied by means of a tapered mandrel which is located within the tube while the corrugations are being formed. Tubing sections with variable depth corrugations define flow paths in which the effective cross sectional area varies correspondingly, and such sections are useful in various heat exchangers.

REFERENCES:
patent: 1982369 (1934-11-01), Brinkman
patent: 2729266 (1956-01-01), Humphrey
patent: 3472418 (1969-10-01), Ullman
patent: 3533267 (1970-10-01), Bunnell
patent: 4059004 (1977-11-01), Perkins

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