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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Aug 16, 2005
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N/A
app pub date -
Sep 22, 2003
filing date -
Dec 26, 2002
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Abstract
The method of manufacturing a heat exchanging fin having an oval collared through-hole is capable of reducing manufacturing cost. The method comprises the steps of: forming a circular projected section, whose transverse sectional shape is a circular shape, in a thin metal plate; drawing the circular projected section a plurality of times so as to form into an oval projected section, whose transverse sectional shape is an oval shape and which has a prescribed height, a prescribed major axis and a prescribed minor axis; and boring a through-hole in the oval projected section so as to form the collared through-hole.
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