Patent ID: 7320177

Claim:
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.