US 7,320,177 B2
Radiator and method of manufacturing the same
Hideyuki Miyahara, Nagano (Japan)
Assigned to Nakamura Seisakusho Kabushikigaisha, Nagano-Ken (Japan)
Filed on Jan. 24, 2005, as Appl. No. 11/41,512.
Claims priority of application No. 2004-019126 (JP), filed on Jan. 28, 2004.
Prior Publication US 2005/0193559 A1, Sep. 08, 2005
Int. Cl. B21D 53/02 (2006.01)
U.S. Cl. 29—890.03  [257/E23.103; 361/697] 6 Claims
OG exemplary drawing
 
1. A method of manufacturing a radiator wherein a plurality of thin-plate heat-radiating fins are raised vertically from a first surface of a metal plate, comprising:
heat-radiating fin formation step for applying a blade of a carving tool to a first surface of a metal plate and for advancing the blade in relative fashion in a direction inclined by a specific angle along the first surface, whereby the blade is dug in towards a second surface of the metal plate to form a plate-shaped heat-radiating fin that rises vertically from a portion on a side of the first surface of the metal plate; and
tool retraction step for retracting the blade relative to the formed heat-radiating fin by a specific pitch along the first surface of the metal plate; wherein
the heat-radiating fin formation step and the tool retraction step are repeated to form a plurality of the heat-radiating fins at a specific pitch in the first surface of the metal plate; and wherein the carving tool has a blade extending in a direction perpendicular to a carving direction in a distal end at a bottom thereof, and a tapered blade is formed at both ends of the blade.