Method of attaching a tube to a fin

Details Method of attaching a tube to a fin Method of attaching a tube to a fin

B - Operations, Transporting

21

D

26/92

B21D 53/08 (2006.01) F28F 1/32 (2006.01)

Patent

CA 1246836

-13- ABSTRACT This specification teaches a method of attaching a fluid conducting metal tube (12) a heat dissipating metal fin (14) that includes the following steps. A metal tube (12) is formed having a generally elliptical cross-section having first similarly curved surfaces (22-22) at opposite ends of a major axis thereof and second similarly curved surfaces (24-24) at opposite ends of a minor axis thereof. A heat dissipating metal fin (14) is formed. An elliptically shaped collar (20) is formed on the fin, this collar providing an opening through the fin and being at least about 1-1/2 times the thickness of the metal forming the fin. The tube is fitted inside the opening of the fin so that areas of these two elements are juxtaposed. The tube is expanded along the major axis so as to bring the first similarly curved surfaces at opposite ends thereof into contact with portions of the collar in juxtaposition therewith. Expansion of the tube is continued along the major axis and initiated along the tube from opposite ends of the major axis toward the surfaces which were defined at opposite ends of the minor axis of the tube. In this manner, any juxtaposed area of the tube and the collar are subjected to an expansion process in which the tube is moved towards the collar, the two elements are brought into contact with one another, and then the two elements are expanded together. The expansion process is progressively terminated between the tube and collar from the major axis of the tube toward the minor axis thereof. The termination occurs in such juxtaposed areas as those areas reach a condition in which the tube is being deformed plastically but the collar is still being deformed elastically. In such a manner, excellent mechanical and thermal contact is made between the tube and the collar of the fin whereby excellent heat transfer may be carried out therebetween.

499531

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