Method of making heat sink

Abstract

A method of making a heat sink ( 10 ) includes the following steps: providing a base ( 11 ) and a plurality of individual fins ( 13 ), and welding the fins successively to the base by ultrasonic welding method.

1 . A method of making a heat sink, comprising:
 providing a base and a plurality of individual fins; and   welding the fins successively to the base by ultrasonic welding method.   
   
   
       2 . The method of making a heat sink of  claim 1 , wherein the base is made of copper, and the fins are made of aluminum. 
   
   
       3 . The method of making a heat sink of  claim 1 , wherein the base has a rectangular shape, and the fins are stacked together and parallel to each other. 
   
   
       4 . The method of making a heat sink of  claim 1 , wherein the base has a cylindrical shape, and the fins are radially welded to the base. 
   
   
       5 . The method of making a heat sink of  claim 4 , wherein each fin includes a lower part, a middle part and an upper part, and a length from an inner side towards an outer side of each of the lower part, the middle part and the upper part is successively increased. 
   
   
       6 . The method of making a heat sink of  claim 1 , wherein each fin includes a main body and a flange extending outwardly from the main body, the flange of each fin being welded to the base by the ultrasonic welding method. 
   
   
       7 . The method of making a heat sink of  claim 6 , wherein each fin has a thickness in a range of 0.3˜0.4 mm. 
   
   
       8 . The method of making a heat sink of  claim 1 , wherein each fin has a thickness in a range of 0.3˜0.4 mm.