Method of forming a heat dissipating structure

Abstract

A forming method for a heat dissipating structure is provided. According to the method, an extrudate is formed by extrution molding, wherein the extrudate includes protruding bending portions extending in parallel. Fins are extruded monolithically on the bending portions. One or more cut channels are formed by cutting the fins and the extrudate with a cutting tool. The cutting tool cuts the fins for forming a notch on each fin at first, and then cuts the bending portions for forming a cut-through slot on each bending portion, wherein each cut-through slot is formed for cooling air flowing through two side of the extrudate. By cutting the bending portions and the fins by the cutting tool at the same time, a large number of cut-through slots are formed in despite of the existence of the fins, and the performance of heat dissipation is enhanced.

1 . A method of forming a heat dissipating structure, comprising steps of:
 extruding a heat dissipating structure including a plurality of bent portions and a plurality of fins, wherein the bent portions protrude outward and are in parallel with the fins, and at least one of the fins is disposed on one of the bent portions of the heat dissipating structure; and   cutting the heat dissipating structure to form at least one cut channel, the cut channel including an notch forming on at least one of the fins and a cut-through slot forming on at least one of the bent portions, wherein the notch and the cut-through slot of the cut channel are coplanar.   
     
     
         2 . The method as claimed in  claim 1 , wherein the step of forming the bent portions by extrusion-molding further comprises simultaneously extruding a plurality of connecting portions for connecting the adjacent bent portions, and the cut depth of each of the cut-through slots is smaller than the height of each of the bent portions protruding from the connecting portions. 
     
     
         3 . The method as claimed in  claim 2 , wherein at least one of the fins is disposed on one of the connecting portions. 
     
     
         4 . The method as claimed in  claim 3 , wherein the step of extruding each bent portion further comprises simultaneously extruding a first protruding portion and a second protruding portion to form the bent portion, and a height of the first protruding portion protruding from the connecting portion is larger than that of the second protruding portion protruding from the connecting portion. 
     
     
         5 . The method as claimed in  claim 4 , wherein the cut channel passes through the first protruding portion to form the cut-through slot. 
     
     
         6 . The method as claimed in  claim 4 , wherein the cut channel passes through the first protruding portion and the second protruding portion to form the cut-through slot. 
     
     
         7 . The method as claimed in  claim 3 , wherein the heights of the bent portions protruding from the connecting portions are unequal. 
     
     
         8 . The method as claimed in  claim 1 , wherein a cross-sectional shape of each of the bent portions is selected from a group consisting of triangular, arc, and quadrangular.