| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pin-like fin integrated type heat sink having satisfactory moldability of pin-like fins, securing mounting strength and proof stress, and having a plate-like part easily plastic-deformable to the thermal expansion and contraction of electric components, and a method for manufacturing the same. <P>SOLUTION: A pin-like fin integrated type heat sink is made of pure copper having a copper purity of not less than 99.90 mass%, and has a plate-like part 2 of which one surface side is provided with a number of erected pin-like fins 3, and at least a part of the peripheral part 7 of the plate-like part 2 has a 0.2% proof stress which is twice to five times of that of the center part of the plate-like part. The pin-like fin integrated type heat sink is manufactured by: a heating step for heat treatment of metallic material; a hot forging step for forging the metallic material after heat treatment on a molding die having a number of holes to make at least a part of the peripheral part of the plate-like part thick-walled and to mold pin-like fins 3 in a part except the thick-walled part and a thin-walled fin erecting part 5 where the pin-like fins are erected; and a cold forging step for forging the thick-walled part in a cold condition to mold the peripheral part of the plate-like part. <P>COPYRIGHT: (C)2013,JPO&INPIT |
