Roll stand with axially displaceable rolls

Abstract

A roll stand for rolled strips of different materials includes rolls which are axially displaceable under load, wherein each displaceable roll has at least one hydrodynamic oil film bearing. a hydraulic unit for effecting the axial displacements is integrated into the hydrodynamic oil film bearing such that the hydraulic unit is adapted to the shape of the hydrodynamic oil film bearing. The diameter of the hydraulic unit is greater than the diameter of the bearing shell of the hydrodynamic oil film bearing. an annular piston has on a circumference thereof a ring which is axially displaceable with the annular piston in a groove of the annular cylinder, wherein annular space portions of the piston are in connection with a control hydraulic system through separate hydraulic connections, so that pressure can be applied to both sides of the ring of the annular piston. each roll has a position indicator connected to a free end of the roll neck of the roll for determining axial position.

1 . Roll stand for hot-rolling or cold-rolling rolled strips of different materials, including work rolls, back-up rolls and, optionally, intermediate rolls arranged in pairs, wherein the rolls ( 6 ) of at least one pair of rolls are axially displaceable toward both sides and have a contour suitable for compensating rolling defects, wherein each displaceable roll ( 6 ) has at least one hydrodynamic oil film bearing ( 3 ) into which is integrated a hydraulic unit ( 17 ) which effects the axial displacement.  
   
   
       2 . Roll stand according to  claim 1 , wherein the hydraulic unit ( 17 ) has an annular cylinder ( 7 ) connected to the roll stand, wherein an annular piston ( 8 ) with an integrated ring ( 10 ) connected to the roll is sealingly guided in the annular cylinder ( 7 ).  
   
   
       3 . Roll stand according to  claim 2 , wherein pressure can be applied to both sides of the ring ( 10 ) of the annular piston ( 8 ).  
   
   
       4 . Roll stand according to  claim 2 , wherein the annular cylinder ( 7 ) has two hydraulic connections ( 13 ).  
   
   
       5 . Roll stand according to  claim 1 , wherein a position indicator ( 15 ) is provided for each displaceable roll ( 6 ).  
   
   
       6 . Roll stand according to  claim 5 , wherein the axial position of the displaceable rolls ( 6 ) is controllable by means of the hydraulic unit ( 17 ) through a control circuit of the roll stand by using the signals of the position indicator ( 15 ).  
   
   
       7 . Roll stand according to  claim 1 , wherein the hydrodynamic oil film bearing ( 3 ) with the hydraulic unit ( 17 ) can be used as a retrofitting part.  
   
   
       8 . Roll stand according to  claim 1 , wherein the hydrodynamic oil film bearing ( 3 ) with the hydraulic unit ( 17 ) can be mounted in front stands and/or rear stands of hot rolling mills and/or cold rolling mills.