Direct mechanically-operated extrusion press

Abstract

There is described an extrusion press ( 1 ) of a metal billet, comprising a die ( 3 ), a punch ( 2 ) able to push the billet through the die ( 3 ), and a container ( 4 ) of the billet upstream of the die ( 3 ). Said extrusion press ( 1 ) further comprises a screw ( 5 ) with which the punch ( 2 ) is integral, able to engage a nut screw ( 6 ) provided in the extrusion press ( 1 ). At least one electric motor ( 7 ) drives the reciprocal movement of the screw ( 5 ) and nut screw ( 6 ), thus causing the translation of the punch ( 2 ) in the extrusion direction.

1 . An extrusion press of a metal billet, comprising a die, a punch able to push the billet through the die and a container of the billet upstream of the die,
 wherein a screw which the punch is integral to, able to engage with a nut screw in the extrusion press,   at least one electric motor driving reciprocal movement of the screw and of the nut screw thus causing the movement of the punch in the extrusion direction.   
     
     
         2 . The extrusion press according to  claim 1 , wherein the nut screw is driven to rotate about an axis of the screw, corresponding to the movement direction of the screw, by said at least one electric motor. 
     
     
         3 . The extrusion press according to  claim 1 , wherein the nut screw is fixed and the screw is driven to rotate about an axis of the screw, corresponding to the movement direction of the screw, at least by said at least one electric motor. 
     
     
         4 . The extrusion press according to  claim 1 , wherein a plurality of horizontal screws which respective nut screws engage with, thus causing the movement in the extrusion direction of a vertical plate which the punch is integral to. 
     
     
         5 . The extrusion press according to  claim 1 , wherein there is a lubrication unit able to insert lubricating fluid between the screw and the nut screw. 
     
     
         6 . The extrusion press according to  claim 1 , wherein said at least one electric motor comprises a rotor integral with the nut screw, and a stator integral with a base. 
     
     
         7 . The extrusion press according to  claim 1 , wherein said at least one electric motor comprises planetary motors able to engage with a crown integral to the nut screw. 
     
     
         8 . The extrusion press according to  claim 1 , wherein a block which provides a cylindrical inner surface of a cylindrical cavity on which a cylindrical outer surface of the nut screw slides. 
     
     
         9 . The extrusion press according to  claim 8 , wherein an interstice is provided between said cylindrical outer surface and said cylindrical inner surface, able to accommodate lubricating fluid to facilitate the sliding of the nut screw in the block.