Extrusion press device and extrusion press method

Abstract

An extrusion press device according to the present invention includes: an extrusion unit that includes a container configured to store an extrusion material and an end platen configured to support a die-from which the extrusion material is extruded; and a control unit configured to control operation of the extrusion unit, including container sealing force that presses the container against the die. The control unit performs control to apply complementary pressure corresponding to reduced container sealing force that is increased along with progression of extrusion, to the container in a direction of the extrusion during a period from start to completion of the extrusion.

1 . An extrusion press device, comprising:
 an extruder comprising a container configured to store an extrusion material, and an end platen configured to support a die from which the extrusion material is extruded; and   a controller configured to control operation of the extruder by controlling a container sealing force that presses the container against the die,   wherein the controller is configured to control application of a complementary pressure corresponding to a reduced container sealing force to the container in a direction of the extrusion during a period from a start to completion of the extrusion, the reduced container sealing force being increased during progression of extrusion.   
     
     
         2 . The extrusion press device according to  claim 1 , wherein the controller is further configured to controls application of the complementary pressure such that a reference container sealing force is maintained during the period from the start to the completion of the extrusion, the reference container sealing force being the container sealing force at the start of the extrusion. 
     
     
         3 . The extrusion press device according to  claim 2 , wherein the controller is further configured to determine the container sealing force at the start of the extrusion as the reference container sealing force. 
     
     
         4 . The extrusion press device according to  claim 3 , wherein the controller is further configured to determine the reduced container sealing force as a difference between the container sealing force during the extrusion and the reference container sealing force. 
     
     
         5 . The extrusion press device according to  claim 1 , wherein the controller is further configured to control application of the complementary pressure as a force of 20% or more and 30% or less of a maximum actual extruding force at the start of the extrusion, to the container. 
     
     
         6 . The extrusion press device according to  claim 1 , wherein:
 the extruder comprises a container cylinder configured to advance the container toward the end platen or withdraw the container from the end platen,   the container cylinder comprises a first oil chamber and a second oil chamber that are arranged in a longitudinal direction along the extrusion direction, and   each of the first oil chamber and the second oil chamber comprises two divided oil chambers divided in the longitudinal direction.   
     
     
         7 . The extrusion press device according to  claim 6 , further comprising:
 an equal-pressure extrusion control hydraulic circuit configured to supply hydraulic oil to one or both of the first oil chamber and the second oil chamber of the container cylinder when the container is advanced by the container cylinder, and   the equal-pressure extrusion control hydraulic circuit is independent of a hydraulic circuit configured to extrude the extrusion material.   
     
     
         8 . An extrusion press method of extruding an extrusion material from a die while pressing a container against the die with a container sealing force, the extrusion material being extruded from the die and being stored in the container, the extrusion press method comprising;
 applying a complementary pressure corresponding to a reduced container sealing force to the container in a direction of the extrusion during a period from the start to completion of the extrusion, wherein:   the container sealing force at a start of extrusion is a reference container sealing force,   the container sealing force during the extrusion is an in-extrusion container sealing force, and   a difference between the reference container sealing force and the in-extrusion container sealing force is the reduced container sealing force.   
     
     
         9 . The extrusion press method according to  claim 8 , wherein the complementary pressure is applied such that the reference container sealing force is maintained during the period from the start to the completion of the extrusion. 
     
     
         10 . The extrusion press method according to  claim 8 , wherein:
 the reference container sealing force and the in-extrusion container sealing force are based on information detected at and after the start of the extrusion, and   the reduced container sealing force and the complementary pressure are determined during the extrusion, based on the detected reference container sealing force and the detected in-extrusion container sealing force.