Die set for manufacturing heat exchanging fin of heat exchanger
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United States of America Patent
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-
Aug 25, 1998
Grant Date -
N/A
app pub date -
Mar 18, 1997
filing date -
Apr 8, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The die set manufactures a heat exchanging fin by the steps of: forming a projected section in a thin metal plate; drawing the projected section, once or a plurality of times, to reduce the diameter thereof and to form the projected section into a cylindrical section; and piercing and barring the cylindrical section to form into a collar section through which a heat exchanging pipe is pierced. The die set comprises: a lower die; an upper die having a die hole whose diameter is shorter than the bottom diameter of the projected section not drawn; a punch being provided in the lower die; and a lifter being provided in the lower die, the lifter being biased toward the upper die by elastic means, the lifter having a through-hole through which the punch passes and an accommodating space for accommodating a slackened section of the projected section, which is formed in the vicinity of a base thereof while drawing the projected section.
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