Extrusion press

Abstract

Provided is a short stroke type extrusion press which is capable of increasing a container strip force, improving energy efficiency, and saving space by reducing apparatus length. A main cylinder housing ( 4 ) of the extrusion press comprises a transfer medium ( 10 ) which advances or retreats an extrusion stem ( 13 ) in an extrusion axis direction, and a transfer medium ( 16 ) which advances or retreats a container ( 14 ) in the extrusion axis direction. A container pushing medium ( 21 ) is disposed at an end platen ( 1 ) disposed opposite the main cylinder housing ( 4 ) and makes it possible for at least four different transfer motions to be carried out independently or in collaboration with the container transfer medium in the direction in which the container ( 14 ) separates from a die ( 9 ).

1 . An extrusion press comprising a moving means which advances and retracts an extrusion stem in an extrusion axial direction and a moving means which advances and retracts a container in the extrusion axial direction,
 characterized in that a container pushing means which enables at least four different types of movement operations in a direction in which said container separates from the die alone or in cooperation with the container moving means is provided at an end platen which is arranged facing said main cylinder housing.   
     
     
         2 . The extrusion press according to  claim 1  characterized in that said four types of movement operations are:
 an air exhaust operation which exhausts compressed air in said container which has been formed in an upset process; 
 an equal pressure extrusion operation which renders a container sealing force which acts on said container constant during an extrusion process; 
 a discard strip operation which strips discard of the billet after the end of the extrusion operation from the inside of said container; and 
 a die opening operation which provides a clearance between an abutting end face of said die and end face of said container when replacing the die after the end of an extrusion cycle. 
 
     
     
         3 . The extrusion press according to  claim 1  characterized by configuring said container pushing means by a plurality of hydraulic cylinders with diameters smaller than the container moving means.