Method and device for winding spiral fins onto oval tubing

Details Method and device for winding spiral fins onto oval tubing Method and device for winding spiral fins onto oval tubing

1978-07-10

1980-12-02

Husar, Francis S.

Metal working

Means to assemble or disassemble

Heat exchanger

291573AH, B23P 1526

Patent

active

042362997

ABSTRACT:
A device for producing finned heat transfer tubing of oval cross section by winding one or more continuous metal strips around the tubing in the form of spiral fins, the contact edge of the metal strip being shaped prior to winding to present a hook-shaped ledge with an acute enclosed angle, and the neutral axis for on-edge bending being shifted to the vicinity of the contact edge by applying to the strip a tensile stress and to its upper half additional transverse compression stress, using a stretch roller and a cooperating winding guide. A lathe-like machine semi-automatically winds two metal strips onto successive lengths of oval tubing, using a carriage with two pivotable winding arms and two strip reels.

REFERENCES:
patent: 2532239 (1950-11-01), Newlin
patent: 2847055 (1958-08-01), Matheny et al.
patent: 3077928 (1963-02-01), Nihlen et al.
patent: 3688375 (1972-09-01), Venables

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