Rolling mill and rolling method

Abstract

In a rolling mill in which hydraulic apparatus for controlling the roll balance or the shape of the rolled material are incorporated in movable frames provided separately from roll chocks mounted at each end of the rolls, reducing the roll inclination thereby making it possible to carry out stable rolling, and also reducing the roll vibrations, and making it possible to manufacture products with a high quality. Providing hydraulic apparatus 12 and 13 for controlling the roll balance and the shape of the rolled material inside the movable frames 10 and 11 , hydraulic apparatus 16 and 17 that push and restrict the roll chocks 4 and 5 and the movable frames 10 and 11 in the direction of flow of the rolled material relative to the roller stand 3 , and the hydraulic apparatus 18 and 19 that push and restrict the movable frames 10 and 11 in the up/down direction relative to the roller stand 3.

What is claimed is  
     
         1 . A rolling mill configured so that the rolls can be moved in the direction of the axis of the rolls depending on the width of the material to be rolled, and having a construction in which the roll chocks mounted at the two ends of the rolls are supported by the housing of the rolling mill via a movable frame provided separately from these roll chocks, said movable frame is provided with a first hydraulic apparatus for carrying out control of the roll balance or of the shape of the rolled material, and a part of this first hydraulic apparatus is made to mate with the flange part of said roll chock section so that said movable frame can be moved in the direction of the roll axis along with the rolls and the roll chock, 
 characterized in that said movable frame is provided with a second hydraulic apparatus that pushes and restricts said roll chock and movable frame relative to said housing of the rolling mill in the direction of flow of the rolled material, and with a third hydraulic apparatus that pushes and restricts said movable frame relative to said housing of the rolling mill in the up/down direction.    
     
     
         2 . A rolling mill according to  claim 1 , characterized in that slipping prevention treatment has been made on both side surfaces of said roll chock and at least one side surface of the movable frame adjacent to said roll chock.  
     
     
         3 . A rolling method using the rolling mill according to  claim 1 , characterized in that said second and third hydraulic apparatus are operated while the rolled material is being rolled, said roll chock and movable frame are pushed and restricted against said housing of the rolling mill, and said second and third hydraulic apparatus are released when the rolled material is not being rolled, and said movable frame, rolls, and roll chock are moved together in the axial direction of the rolls.  
     
     
         4 . A rolling method according to  claim 3 , characterized in that the vibrations of said rolls are detected, and if the amplitude or acceleration of those vibrations exceeds a certain value, the pushing force of said second hydraulic apparatus is increased.  
     
     
         5 . A rolling mill comprising: 
 a moving apparatus for moving a work roll in a direction of the roll;    roll chocks rotatably supporting said work roll;    a movable frame disposed between said work roll and a rolling mill housing, supporting said roll chocks against said rolling mill housing and being movable by said moving apparatus in the direction of the roll; and    a hydraulic apparatus pushing said movable frame in an up and down direction.    
     
     
         6 . A rolling mill comprising: 
 a moving apparatus for moving a work roll in a direction of the roll;    roll chocks rotatably supporting said work roll;    a movable frame disposed between said work roll and a rolling mill housing, supporting said roll chocks against said rolling mill housing and being movable by said moving apparatus in the direction of the roll; and    a hydraulic apparatus pushing said movable flame in a rolling direction.    
     
     
         7 . A rolling method by a rolling mill provided with a moving apparatus for moving a work roll in a roll direction and roll chocks rotatably supporting said work roll, said method comprising the steps: 
 supporting said roll chocks against a rolling mill housing through a movable frame which is movable by said moving apparatus in the roll direction;    moving said work roll, roll chocks and movable frame in the roll direction by said moving apparatus according to the width of a rolling material; and    rolling while pushing said movable frame in the rolling direction.    
     
     
         8 . A rolling method by a rolling mill provided with a moving apparatus for moving a work roll in a roll direction and roll chocks rotatably supporting said work roll, said method comprising the steps: 
 supporting said roll chocks against a rolling mill housing through a movable frame which is movable by said moving apparatus in the roll direction;    moving said work roll, roll chocks and movable frame in the roll direction by said moving apparatus according to the width of a rolling material; and    rolling while pushing said movable frame in an up and down direction.