Method for mechanically expanding elliptical tubes

Details Method for mechanically expanding elliptical tubes Method for mechanically expanding elliptical tubes

1995-06-05

1997-02-25

Cuda, Irene

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

29890043, 29727, B23P 1526

Patent

active

056049820

ABSTRACT:
An elliptical cross section tube of novel construction that is capable of being expanded by a conventional conical tool of the type used to expand round cross section tubes. The tube is also reinforced by integral internal webs. The unexpanded tube cross section has concave lengthwise channels and concave internal webs that are all internally tangent to a circle representing a cross section of the expansion tool's conical head. As the head of the tool is pushed through the tube, it pushes the channels out into the fin hole while flattening the webs. The tube is thus mechanically bonded to the tube, and is left with a pair of internal reinforcing webs.

REFERENCES:
patent: 3603384 (1971-09-01), Huggins et al.
patent: 4228573 (1980-10-01), Barnard
patent: 4269267 (1981-05-01), Labrande
patent: 4570317 (1986-02-01), Veling et al.
patent: 4692979 (1987-09-01), Pietzcker
patent: 4815651 (1989-03-01), Malwitz
patent: 5101561 (1992-04-01), Fuhrmann et al.
patent: 5345674 (1994-09-01), Knecht et al.

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