Method for manufacturing heat exchanger tubing

Details Method for manufacturing heat exchanger tubing Method for manufacturing heat exchanger tubing

1979-08-22

1981-08-18

Crane, Daniel C.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

72366, 72368, 29727, 291573R, 138 38, 138177, 165148, B23P 1526

Patent

active

042838240

ABSTRACT:
In accordance with the teachings of the instant invention, methods and apparatus are set forth for the manufacture of discrete lengths of heat exchanger tubing comprised of a thin walled metallic tubular member having a plurality of spaced apart transverse grooves impressed into its outer surface, and expanded end portions whose inner cross sections form symmetrical polygons. Such tubing is manufactured in accordance with the instant invention by the steps of deforming a metal band in a longitudinal direction into a tubular member, continuously seam welding the longitudinal edges of the tubular member, continuously impressing spaced apart grooves into the outer surface of the welded tubular member, transversely cutting the tubular member along smooth portions of the tubular member between selected adjacent transverse grooves to form discrete tube lengths, and expanding the inner cross sections of the end portions of each of such lengths to form symmetrical polygons.

REFERENCES:
patent: 1363416 (1920-12-01), Hooker
patent: 1761980 (1930-06-01), Bundy
patent: 2420992 (1947-05-01), Wilson

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