F - Mech Eng,Light,Heat,Weapons – 28 – F
Patent
F - Mech Eng,Light,Heat,Weapons
28
F
26/146, 257/27
F28F 1/10 (2006.01) B21C 37/20 (2006.01) B21D 53/02 (2006.01)
Patent
CA 1247592
"FINNED HEAT EXCHANGER TUBES AND METHOD AND APPARATUS FOR MAKING SAME" 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 deepening 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 dis- closed 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 3Ø
458443
Campbell Bonnie J.
Cunningham James L.
Macrae & Co.
Wolverine Tube Inc.
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