Heat exchange – Tubular structure – With discrete heat transfer means
Patent
1985-10-30
1990-04-10
Ford, John
Heat exchange
Tubular structure
With discrete heat transfer means
72 96, 72 98, 72100, F28F 136, F28F 2108
Patent
active
049151665
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 disclosed which has at leasts 26 fins per inch, a fin height of at least 0.034" and an outside to inside surface area ratrio of at least 3.0.
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Campbell Bonnie J.
Cunningham James L.
Clark Barry L.
Ford John
Wolverine Tube, Inc.
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