Method of manufacturing heat exchanging fin and die set for...

Details Method of manufacturing heat exchanging fin and die set for... Method of manufacturing heat exchanging fin and die set for...

2005-08-16

2005-08-16

Crane, Daniel C. (Department: 3725)

Metal deforming

With cutting

By shearing tool-couple

C072S356000, C029S890043

Reexamination Certificate

active

06928849

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.

REFERENCES:
patent: 1642166 (1927-09-01), McCaffrey
patent: 1724486 (1929-08-01), Karmazin
patent: 5237849 (1993-08-01), Miyazawa
patent: 5366006 (1994-11-01), Lu et al.
patent: 5797291 (1998-08-01), Yamada
patent: 6415506 (2002-07-01), Baba et al.
patent: 6460394 (2002-10-01), Hidaka et al.

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