Integral finned tubes and a method of manufacturing same

Details Integral finned tubes and a method of manufacturing same Integral finned tubes and a method of manufacturing same

1989-04-14

1991-08-06

Crane, Daniel C.

Metal deforming

By pulling workpiece through closed periphery die

Utilizing plural metal-deforming tools

2989005, B21C 124

Patent

active

050366939

ABSTRACT:
Manufacture of integral finned tube utilizing a succession of plugged convergent, cold draw die stages. To produce a tube with diametrically opposed integral fins an initial stage die has an exit with an approximately elliptical outer periphery to form a tube with diametrically opposed thicker, or bulged walls. An intermediate stage has an exit of generally circular periphery with a pair of part circular, diametrically opposed, recesses to form a tube with more pronounced bulges. A final stage die has an exit of generally circular periphery with a pair of diametrically opposed, straight sided recesses to form a tube with bulges constituting planar faced fins. Between each successive stage the circumferential extent of each bulge is reduced while the maximum thickness is increased.

REFERENCES:
patent: 3131803 (1964-05-01), Hill
patent: 3630062 (1971-12-01), Odaki

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