Extrusion tool, method for manufacturing shaped article with fins, and heat sink

Abstract

An extrusion tool ( 10 ) according to the present invention includes a die main body ( 20 ) having a bearing hole ( 21 ) or defining an external configuration of the shaped article ( 1 ), the bearing hole ( 21 ) including a substrate forming portion ( 22 ) corresponding to the substrate ( 2 ) and fin forming portions ( 23 ) corresponding to the fins ( 3 ), and a plate member ( 30 ) to be disposed at an upstream side of the die main body ( 20 ). The plate member ( 30 ) is provided with a material passage ( 31 ) penetrating in the fore-and-aft direction and communicates with an upstream side opening of the bearing hole ( 21 ) of the die main body ( 20 ). The plate member ( 30 ) is provided with at least one vertical partitioning wall ( 33 ) ( 34 ) so as to cross the substrate forming portion ( 22 ) of the bearing hole ( 21 ) in the thickness direction of the substrate ( 2 ) in a state in which the plate member ( 30 ) is combined with the die main body ( 20 ), whereby the material passage ( 31 ) is divided into a plurality of small passages ( 31 a )( 31 b )( 31 c )( 31 d )( 31 e )( 31 f ). By using the extrusion tool for extruding a shaped article with fins such as a heat sink, excellent degree of flatness of the substrate can be obtained.

1 . An extrusion tool for extruding a shaped article with fins having a substrate and a plurality of thin plate-type fins arranged like comb-teeth on one side of the substrate, said extrusion tool comprising: 
 a die main body having a bearing hole for defining an external configuration of the shaped article, said bearing hole including a substrate forming portion corresponding to the substrate and fin forming portions corresponding to the fins; and    a plate member to be disposed at a downstream side of said die main body,    wherein said plate member is provided with a material passage penetrating in the fore-and-aft direction and that communicates with an upstream side opening of said bearing hole of said die main body, and    wherein said plate member is provided with at least one vertical partitioning wall so as to cross said substrate forming portion of said bearing hole in the thickness direction of the substrate in a state in which said plate member is combined with said die main body, whereby the material passage is divided into a plurality of small passages.    
     
     
         2 . The extrusion tool as recited in  claim 1 , wherein two or more vertical partitioning walls are provided in said material passage of said plate member.  
     
     
         3 . The extrusion tool as recited in  claim 1 , wherein a merging space communicating said plurality of small passages is provided at a downstream side portion of said material passage of said plate member.  
     
     
         4 . The extrusion tool as recited in  claim 1 , wherein said vertical partitioning wall is formed so as to cross said fin forming portions.  
     
     
         5 . The extrusion tool as recited in  claim 1 , further comprising a horizontal partitioning wall formed in said material passage of said plate member, wherein said horizontal partitioning wall is positioned at a boundary portion between said substrate forming portion and said fin forming portions in a state in which said plate member is combined with said die main body.  
     
     
         6 . The extrusion tool as recited in  claim 1 , wherein said horizontal partitioning wall is formed to have an inclined surface at a front portion facing said substrate forming portion, said inclined surface being inclined toward said fin forming portions.  
     
     
         7 . The extrusion tool as recited in  claim 1 , wherein said die main body is provided with a dented portion formed at an upstream side portion thereof and communicated with said bearing hole for introducing the extruding material into said bearing hole.  
     
     
         8 . A method for manufacturing a shaped article with a plurality of thin plate-type fins arranged like comb-teeth on one side of a substrate, said method comprising: 
 preparing an extrusion tool comprising a die main body having a bearing hole for defining an external configuration of said shaped article, said bearing hole including a substrate forming portion corresponding to the substrate and fin forming portions corresponding to the fins, and a plate member to be disposed at an upstream side of said die main body, wherein said plate member is provided with a material passage penetrating in the fore-and-aft direction and that communicates with an upstream side opening of said bearing hole of said die main body, and wherein said plate member is provided with at least one vertical partitioning wall so as to cross said substrate forming portion of said bearing hole in the thickness direction of the substrate in a state in which said plate member is combined with said die main body, whereby the material passage is divided into a plurality of small passages;    extruding an extruding material using said extrusion tool such that the extruding material divided by said small passages of said plate member are merged to be pressed and adhered and then extruded through said bearing hole.    
     
     
         9 . The method for manufacturing a shaped article with fins as set recited in  claim 8 , wherein the extruding material is aluminum.  
     
     
         10 . The method for manufacturing a shaped article with fins as set recited in  claim 8 , wherein the shaped article with a plurality of thin plate-type fins is a heat sink.  
     
     
         11 . heat sink manufactured by the method as recited in  claim 10.