Integral finned tubes and a method of manufacturing same
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United States of America Patent
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-
Aug 6, 1991
Grant Date -
N/A
app pub date -
Apr 14, 1989
filing date -
Apr 15, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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