Heat sink structure and method of manufacturing same

Abstract

A heat sink structure and a method of manufacturing same are disclosed. The heat sink structure includes a main body and a plurality of radiating fins. The main body has a plurality of coupling flutes circumferentially spaced along an outer surface thereof and longitudinally extended from a first end to a second thereof. The radiating fins respectively have a bent section integrally located between a first and a second heat radiating section. To quickly assemble the radiating fins to the main body, the radiating fins are disposed in a forming mold, and the main body is mechanically driven into the forming mold at a high speed, so that the bent sections of the radiating fins are longitudinally forced into the coupling flutes from the first to the second end of the main body to thereby tightly connect the radiating fins to the main body.

What is claimed is: 
     
         1 . A heat sink structure, comprising:
 a main body having a first end and an opposite second end and being extended in a longitudinal direction between the first end and the second end; and the main body being provided on an outer surface with a plurality of circumferentially spaced coupling flutes, which longitudinally extend from the first end to the second end; and   a plurality of radiating fins being assembled to and located around the main body; each of the radiating fins having a first heat radiating section and a second heat radiating section formed at two lateral portions thereof, and a bent section located between the first and the second heat radiating section and shaped corresponding to the coupling flute;   wherein the main body is driven by a mechanical process toward the radiating fins at a high speed, so that the bent sections of the radiating fins are forced into the coupling flutes via the first end of the main body and longitudinally moved to the second end of the main body at a high speed, bringing the bent sections of the radiating fins to tightly connect to the coupling flutes.   
     
     
         2 . The heat sink structure as claimed in  claim 1 , wherein the bent section can be formed at a middle portion or at a non-middle portion of the radiating fin, and the first and the second heat radiating section are respectively extended from two lateral portions of the bent section. 
     
     
         3 . The heat sink structure as claimed in  claim 1 , wherein each of the bent sections has an outer surface in tight contact with and clamped by an inner wall surface of the coupling flute. 
     
     
         4 . The heat sink structure as claimed in  claim 1 , wherein the bent sections respectively have an upper end, an outer edge of which is rounded or chamfered to form a lead-in section. 
     
     
         5 . The heat sink structure as claimed in  claim 1 , wherein the main body is provided in each of the coupling flutes adjoining the first end with a force-in section, which communicates with the coupling flute. 
     
     
         6 . The heat sink structure as claimed in  claim 1 , further comprising a plurality of second radiating fins; each of the second radiating fins having a third heat radiating section and a fourth heat radiating section formed at two lateral portions thereof, and a second bent section located between the third and the fourth heat radiating section; and each of the third heat radiating sections being located between the first and the second heat radiating section of one radiating fin and clamped in the bent section of the radiating fin, and the first heat radiating section is clamped in the second bent section. 
     
     
         7 . The heat sink structure as claimed in  claim 6 , wherein the fourth heat radiating section of each second radiating fin is located between the first and the second heat radiating section of another adjacent radiating fin and clamped in the bent section of the adjacent radiating fin, and the second heat radiating section of the adjacent radiating fin is also clamped in the second bent section of the second radiating fin. 
     
     
         8 . The heat sink structure as claimed in  claim 1 , further comprising a plurality of second radiating fins; each of the second radiating fins being located between the first and the second heat radiating section of one radiating fin and clamped in the bent section of the radiating fin. 
     
     
         9 . A method of manufacturing heat sink structure, comprising the following steps:
 providing a forming mold, which has an inner wall surface, a top surface and a plurality of slots; the inner wall surface enclosing an inner space, the slots being radially outward extended from the inner wall surface to locate around and communicate with the inner space, and the slots respectively having an upper end that extends through the top surface;   providing a main body, which is longitudinally extended between a first end and a second end thereof, and has a plurality of coupling flutes circumferentially spaced on an outer surface thereof and longitudinally extended from the first end to the second end; and disposing the first end of the main body in the inner space of the forming mold;   providing a plurality of radiating fins, each of which has a first and a second heat radiating section and a bent section located between the first and the second heat radiating section; correspondingly disposing the first and second heat radiating sections of the radiating fins in the slots with the bent sections of the radiating fins radially projected from the inner wall surface into the inner space of the forming mold; and   using a mechanical process to drive the main body into the inner space at a high speed, so that the main body moves relative to the radiating fins and the bent sections of the radiating fins are forced into the coupling flutes and longitudinally moved along the coupling flutes to the second end of the main body at a high speed, bringing the bent sections and the coupling flutes to tightly connect to one another.   
     
     
         10 . The heat sink structure manufacturing method as claimed in  claim 9 , wherein, in the mechanical process, a gas compressing machine is used to produce a compressed gas for driving the main body into the inner space of the forming mold at a high speed. 
     
     
         11 . The heat sink structure manufacturing method as claimed in  claim 10 , wherein the inner space has a central body disposed therein, and the first end of the main body being disposed in the inner space around the central body. 
     
     
         12 . The heat sink structure manufacturing method as claimed in  claim 9 , wherein the bent section can be formed at a middle portion or at a non-middle portion of the radiating fin, and the first and the second heat radiating section are respectively extended from two lateral portions of the bent section. 
     
     
         13 . The heat sink structure manufacturing method as claimed in  claim 9 , wherein two lateral portions of the bent sections are horizontally tightly pressed against an inner wall surface of the coupling flutes. 
     
     
         14 . The heat sink structure manufacturing method as claimed in  claim 9 , wherein the forming mold further has at least one second slot.