Casting roller with active profile control

Abstract

The invention relates to a casting roll ( 1 ) for the casting of metal strip in the casting gap between two casting rolls with variable separation which are parallel and which can be cooled. The casting roll comprises a roll axle ( 3 ) with a roll casing ( 2 ) surrounding said axle and with adjustable convexity of the peripheral surface of said roll casing during operation by means of a hydraulic pressure cushion ( 14 ). The rotatable roll axle ( 3 ) is designed with a cylinder ( 9 ), comprising a piston ( 10 ), on at least one side ( 5, 7 ) of the casting roll ( 1 ), and a power system ( 11 ) is provided for exertion via the pistons ( 10 ) on the pressure medium to influence the convexity of the roll casing ( 2 ).

1 . Casting roller ( 1 ) of a casting machine for casting metal strip, comprising a roller axis ( 3 ) with a roller casing ( 2 ) surrounding the roller axis ( 3 ), with a camber of its circumferential surface adjustable during the casting operation with hydraulic pressure cushions ( 14 ), wherein on at least one side ( 5 ,  7 ) of the casting roller ( 1 ) the rotating roller axis ( 3 ) is formed with a cylinder ( 9 ) which has a piston ( 10 ), and a power system ( 11 ) is provided for influencing the crown of the roller casing ( 2 ) by acting through the piston ( 10 ) on a pressure medium. 
     
     
         2 . Casting roller according to  claim 1 , wherein the power system ( 11 ) is a hydraulic cylinder. 
     
     
         3 . Casting roller according to  claim 1 , wherein at least one annular pressure cushion ( 14 ) is arranged over the width of the roller axis ( 2 ). 
     
     
         4 . Casting roller according to  claim 1 , wherein the width of the pressure cushion  14  is at least 80 mm smaller than the width of the roller casing ( 2 ). 
     
     
         5 . Casting roller according to  claim 1 , wherein several annular pressure cushions ( 14 ) with preferably different widths are arranged over the width of the roller axis ( 3 ). 
     
     
         6 . Casting roller according to  claim 1 , wherein the annular pressure cushions ( 14 ) have an increasing width toward the middle of the roller axis. 
     
     
         7 . Casting roller according to  claim 1 , wherein the ratio of the maximum and minimum width of the pressure cushions ( 14 ) is smaller than 4. 
     
     
         8 . Casting roller according to  claim 1 , wherein the annular pressure cushion ( 14 ) or the annular pressure cushions ( 14 ) are arranged between the roller axis ( 3 ) and the roller casing ( 2 ). 
     
     
         9 . Casting roller according to  claim 1 , wherein the radial distance in the area of the annular pressure pistons ( 14 ) between the roller axis ( 3 ) and the roller casing ( 2 ) is greater than 0.5 mm and smaller than 5 mm. 
     
     
         10 . Casting roller according to  claim 1 , wherein the piston ( 10 ) has a diameter of between 20 and 100 mm. 
     
     
         11 . Casting roller according to  claim 1 , wherein a check valve is arranged in the piston ( 10 ). 
     
     
         12 . Casting roller according to  claim 1 , wherein the cylinder ( 9 ) and the power system ( 11 ) are arranged on the drive-free side ( 7 ). 
     
     
         13 . Method of operating a casting roller according to  claim 1 , wherein for ventilating the pressure system the pressure medium is supplied through the piston ( 10 ) and is discharged through each pressure cushion ( 14 ) through the roller casing ( 2 ). 
     
     
         14 . Method according to  claim 1 , wherein pressure is applied to the pressure system after the assembly of the casting roller ( 1 ). 
     
     
         15 . Casting roller according to  claim 13 , wherein the pressure system is constructed for a maximum pressure of 1000 bar. 
     
     
         16 . Method according to  claim 13 , wherein the pressure is adjusted in dependence on the diameter of the piston ( 10 ) in proportion to the force of the power system ( 11 ).