Method for making heat exchange tubes

Details Method for making heat exchange tubes Method for making heat exchange tubes

1985-06-24

1987-09-15

Rosenbaum, Mark

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291573AH, 72 98, 72 69, B21D 5302, B23D 1526

Patent

active

046929789

ABSTRACT:
Improved method and apparatus for making finned tubing from difficult to work materials such as titanium and stainless steel uses spaced sets of finning discs on a plurality of arbors to form a tube against a mandrel having different diameters under each set of discs. By forming the tube fin tips to their final O.D. in a first disc set and by depending their roots to bring the fins to their final height in a second disc set, tubes with higher fin counts and/or higher fin heights can be achieved than were formerly possible. The process of separately cold working the tips and roots also permits tubes to be made which are dimensionally identical to prior art tubes but with higher quality and productivity since tube stresses are greatly reduced. An improved titanium tube is also disclosed which has at least 26 fins per inch, a fin height of at least 0.034" and an outside to inside surface area ratio of at least 3.0.

REFERENCES:
patent: 2868046 (1959-01-01), Greene
patent: 3174319 (1965-03-01), Koyama et al.
patent: 3383893 (1968-05-01), Counts
patent: 3795125 (1974-03-01), Laing
patent: 4366859 (1983-01-01), Keyes

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