Method and apparatus for internally enhancing heat exchanger tub

Details Method and apparatus for internally enhancing heat exchanger tub Method and apparatus for internally enhancing heat exchanger tub

1989-03-06

1991-02-26

Larson, Lowell A.

Metal deforming

By use of 'flying tool' engaging moving work

Including orbitally-moving tool-face

72198, B21C 3720

Patent

active

049952528

ABSTRACT:
A method and machine for forming internal enhancement ribs in heat exchanger pipe or tubing comprises a mandrel which is supported within the tubing and a plurality of opposed rotary dies which have their axes perpendicular to the tube axis so that they rotate in the direction parallel to the tube axis. The rotary dies have a circumferential contact portion that has a concave arcuate profile. In one embodiment, the circumferential surface is scalloped with a succession of axially raised portions. In another embodiment, the rotary die carries a plurality of circumferential rollers.

REFERENCES:
patent: 771611 (1904-10-01), Davis
patent: 1622744 (1927-03-01), Stiefel
patent: 3143009 (1964-08-01), Pfeiffer
patent: 3422518 (1969-01-01), French
patent: 3566651 (1971-03-01), Tlaker
patent: 4715205 (1987-12-01), Fazan

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