Method of manufacturing heat exchanging fin and die set for manufacturing the same
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United States of America Patent
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-
Oct 8, 2002
Grant Date -
Jan 17, 2002
app pub date -
Mar 26, 2001
filing date -
Jul 13, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method of manufacturing a heat exchanging fin is able to restrict forming wrinkles and ring marks in the heat exchanging fin. The method comprises the steps of: forming dome sections having diameters greater than the diameters of collared-through-holes and which are projected from one side face of a thin plate, and a plurality of circular recesses having diameters greater than of the dome sections, each of which encloses one of the dome sections, the circular recesses being depressed toward the opposite face of the thin plate; forming the dome sections and the recesses into truncated cone-shaped sections in a plurality of steps; forming a through-hole in each of the truncated cone-shaped sections; forming edges of the through-holes into collars; and forming a flange at a front end of each of the collars.
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