Die assembly tool for extrusion molding

Abstract

A die assembly P 1 is configured such that an extrusion die 10 is mounted in a die mounting hole 61 formed in a die mounting plate 60 and a metallic material introduced in the die mounting hole 61 is introduced in the extrusion die 10 via a porthole 24 formed in a metallic material pressure receiving surface 22 of the die 10. A material accumulating portion 70 extending to a point on a more extrusion directional downstream side than an inlet position of the porthole 24 is provided outside the porthole 24 in the die mounting hole 61 to accumulate a part 75 of the metallic material introduced into the die mounting hole 61.

1 . An extrusion die assembly in which an extrusion die is mounted in a die mounting hole of a die mounting plate, so that a metallic material to be introduced into the die mounting hole is introduced in the die via a porthole formed in a metallic material pressure receiving surface of the die, characterized in that
 a material accumulating portion extending to a point on a more extrusion directional downstream side than an inlet position of the porthole is provided outside the porthole in the die mounting hole so as to accumulate a part of the metallic material introduced into the die mounting hole in the material accumulating portion.   
   
   
       2 . The extrusion die assembly as recited in  claim 1 ,
 wherein the extrusion die comprises   a die case having a pressure receiving portion with an external surface constituting the metallic material pressure receiving surf ace,   a male die mounted in the die case, and   a female die mounted in the die case so as to form an extrusion hole by and between the male die and the female die,   wherein the pressure receiving surface is formed into a convex configuration protruded toward an upstream side of an extrusion direction, and the porthole is formed in an external periphery of the pressure receiving portion, and   wherein the material accumulating portion is provided at an external peripheral portion of the pressure receiving portion.   
   
   
       3 . The extrusion die assembly as recited in  claim 1 , wherein an inlet side peripheral edge portion of the die mounting hole of the die mounting plate is removed to thereby form a removed portion a t an upstream side external periphery of the material accumulating portion. 
   
   
       4 . The extrusion die assembly as recited in  claim 3 , wherein an inner peripheral wall surface of the removed portion is formed into a tapered surface which gradually reduces in diameter toward a downstream side. 
   
   
       5 . The extrusion die assembly as recited in  claim 3 , wherein an inner peripheral wall surface of the removed portion is arranged in parallel with a central axis of the die. 
   
   
       6 . The extrusion die assembly as recited in  claim 3 , wherein an inner peripheral wall surface of the removed portion is formed into a tapered surface which gradually increases in diameter toward a downstream side. 
   
   
       7 . The extrusion die assembly as recited in  claim 1 , wherein the die mounting plate is provided with a plurality of die mounting holes, and the extrusion dies are mounted in each die mounting hole. 
   
   
       8 . The extrusion die assembly as recited in  claim 1 , wherein a plurality of extrusion dies are disposed in a single die mounting hole. 
   
   
       9 . The extrusion die assembly as recited in  claim 2 , wherein the pressure receiving surface of the die is formed into a convex spherical surface forming a part of a spherical surface. 
   
   
       10 . The extrusion die assembly as recited in  claim 2 , wherein the pressure receiving surface of the die is constituted by a  1 / 6  to  4 / 6  convex spherical surface. 
   
   
       11 . The extrusion die assembly as recited in  claim 2 , wherein a plurality of portholes are formed at equal intervals around a central axis of the die. 
   
   
       12 . The extrusion die assembly as recited in  claim 2 ,
 wherein the male die and the female die form a flat circular extrusion hole having a height (thickness) smaller than a width,   wherein a portion of the male die corresponding to the extrusion hole is formed into a comb-like configuration having a plurality of passage forming protrusions arranged in a lateral direction, and   wherein a multi-passage hollow member having a plurality of passages arranged in a lateral direction is formed when a metallic material passes through the extrusion hole.   
   
   
       13 . The extrusion die assembly as recited in  claim 2 ,
 wherein the male die and the female die form a circular extrusion hole, and wherein a tubular member circular in cross-section is formed when a metallic material passes through the extrusion hole.   
   
   
       14 . The extrusion die assembly as recited in  2   claim 1 , wherein the metallic material is aluminum or its alloy. 
   
   
       15 . A production method of an extruded article, wherein the extruded article is formed using the extrusion die assembly as recited in  2   claim 1 . 
   
   
       16 . A production method of a multi-passage hollow member, wherein the multi-passage hollow member is formed using the extrusion die assembly as recited in  claim 12 . 
   
   
       17 . A production method of a tubular member, wherein the tubular member is formed using the extrusion die assembly as recited in  claim 13 . 
   
   
       18 . A metallic material extrusion method in which an extrusion die is mounted in a die mounting hole of a die mounting plate so that a metallic material introduced in the die mounting hole is introduced in the die via a porthole formed in a metallic material pressure receiving surface of the extrusion die,
 wherein a material accumulating portion extending to a point on a more extrusion directional downstream side than an inlet position of the porthole is formed outside the porthole in the die mounting hole so that a part of the metallic material is accumulated in the material accumulating portion when the metallic material is introduced in the die mounting hole.   
   
   
       19 . A metallic material extruder, comprising:
 a container;   a die mounting plate attached to the container; and   an extrusion die mounted in a die mounting hole of the die mounting plate,   wherein it is constructed such that a metallic material introduced in the container is introduced in the die mounting hole and the metallic material introduced in the die mounting hole is introduced in the extrusion die via a porthole formed in a metallic material pressure receiving surface of the extrusion die, and   wherein a material accumulating portion extending to a point on a more extrusion directional downstream side than an inlet position of the porthole is formed outside the porthole in the die mounting hole so that a part of the metallic material introduced in the die mounting hole is accumulated in the metallic accumulating portion.