Extrusion press machine and platen for extrusion press machine

Abstract

An extrusion press machine includes: a die configured to extrusion-mold a workpiece; a cylinder configured to apply pressing force to press the workpiece against the die; and a platen configured to receive the pressing force from the die. The platen includes an outside element and an inside element that is disposed coaxially with the outside element, inside the outside element. The inside element includes one or more fluid supply structures each supplying a cooling medium toward an extruded product extruded from the die.

1 . An extrusion press machine, comprising:
 a die configured to extrusion-mold a workpiece;   a cylinder configured to apply pressing force to press the workpiece against the die; and   a platen configured to receive the pressing force from the die, wherein   the platen includes:   an outside element; and   an inside element that is disposed coaxially with the outside element, inside the outside element, and   the inside element includes   one or more fluid supply structures each supplying a cooling medium toward an extruded product extruded from the die.   
     
     
         2 . The extrusion press machine according to  claim 1 , wherein
 each of the fluid supply structures includes a first structure supplying the cooling medium, and   the first structure includes a first flow path through which the cooling medium flows, and a first nozzle ejecting the cooling medium having flowed through the first flow path.   
     
     
         3 . The extrusion press machine according to  claim 2 , wherein
 each of the fluid supply structures includes a second structure supplying air to form an air curtain,   the second structure includes a second flow path through which the air flows, and a second nozzle ejecting the air having flowed through the second flow path, and   the second nozzle is provided on a side close to the die more than the first nozzle.   
     
     
         4 . The extrusion press machine according to  claim 2 , wherein the fluid supply structures are provided with equal intervals in a circumferential direction. 
     
     
         5 . The extrusion press machine according to  claim 2 , wherein
 the inside element includes a large-diameter portion provided on a front side, and a small-diameter portion continuous with the large-diameter portion, and   the first flow path extends inside the small-diameter portion from a rear side to the front side, and the first nozzle has an ejection port directed to an inside in a radial direction of the small-diameter portion.   
     
     
         6 . The extrusion press machine according to  claim 3 , wherein
 the inside element includes a large-diameter portion provided on a front side, and a small-diameter portion continuous with the large-diameter portion, and   the second flow path extends inside the small-diameter portion from a rear side to the front side, and the second nozzle has an ejection port directed to an inside in a radial direction of the small-diameter portion.   
     
     
         7 . The extrusion press machine according to  claim 3 , wherein the air curtain is formed to prevent liquid as the cooling medium ejected from the first nozzle, from reaching the die. 
     
     
         8 . The extrusion press machine according to  claim 3 , wherein, in each of the fluid supply structures,
 the first nozzle and the second nozzle are provided to be exposed to an inside of the inside element through short pipes, or   the first nozzle and the second nozzle are provided in concave portions provided on an inner peripheral surface of the inside element.   
     
     
         9 . The extrusion press machine according to  claim 1 , wherein the inside element is provided to sandwich the outside element from front and rear surfaces of the outside element. 
     
     
         10 . The extrusion press machine according to  claim 9 , wherein the inside element is disposed inside the outside element while tensile stress is generated in advance in an axial direction by a preliminary load greater than or equal to a load acting during an extrusion process. 
     
     
         11 . The extrusion press machine according to  claim 1 , wherein the inside element is made of a metal material that has a longitudinal elastic modulus substantially same as or greater than a longitudinal elastic modulus of the outside element. 
     
     
         12 . A platen for an extrusion press machine, the platen being configured to receive pressing force in extrusion molding by a die, the platen comprising an outside element and an inside element that is disposed coaxially with the outside element, inside the outside element, wherein
 the inside element includes one or more fluid supply structures each supplying a cooling medium toward an extruded product extruded from the die.