Meandering control method, meandering control apparatus, and manufacturing method for steel sheet

Abstract

A meandering control method for a steel sheet, the method includes: a measurement step of measuring an out-of-plane deformation amount of the steel sheet on an upstream side of a steering device that changes a conveyance direction of the steel sheet; a calculation step of calculating an average curvature of the steel sheet using the out-of-plane deformation amount of the steel sheet measured in the measurement step; and a control step of calculating an off-center amount of the steel sheet in the steering device using the average curvature of the steel sheet calculated in the calculation step, and controlling a winding position of the steel sheet relative to the steering device based on the calculated off-center amount.

1 . A meandering control method for a steel sheet, the method comprising:
 a measurement step of measuring an out-of-plane deformation amount of the steel sheet on an upstream side of a steering device that changes a conveyance direction of the steel sheet;   a calculation step of calculating an average curvature of the steel sheet using the out-of-plane deformation amount of the steel sheet measured in the measurement step; and   a control step of calculating an off-center amount of the steel sheet in the steering device using the average curvature of the steel sheet calculated in the calculation step, and controlling a winding position of the steel sheet relative to the steering device based on the calculated off-center amount.   
     
     
         2 . The meandering control method for the steel sheet according to  claim 1 , wherein the measurement step includes a step of measuring the out-of-plane deformation amount of the steel sheet on a delivery side of a cutting device installed on the upstream side of the steering device, the cutting device being configured to cut an end portion of the steel sheet in a width direction. 
     
     
         3 . A meandering control apparatus for a steel sheet, the apparatus comprising:
 a steering device that changes a conveyance direction of the steel sheet;   a measurement device that measures an out-of-plane deformation amount of the steel sheet on an upstream side of the steering device;   a position adjustment device that adjusts a winding position of the steel sheet relative to the steering device; and   a control device that controls the position adjustment device,   wherein the control device
 calculates an average curvature of the steel sheet using the out-of-plane deformation amount of the steel sheet that is measured by the measurement device, 
 calculates an off-center amount of the steel sheet in the steering device using the calculated average curvature of the steel sheet, and 
 controls the position adjustment device based on the calculated off-center amount. 
   
     
     
         4 . The meandering control apparatus for the steel sheet according to  claim 3 , wherein the measurement device is installed on a delivery side of a cutting device installed on the upstream side of the steering device, the cutting device being configured to cut an end portion of the steel sheet in a width direction. 
     
     
         5 . A manufacturing method for a steel sheet, the method comprising:
 a storage step of storing the steel sheet in a looper device while suppressing the meandering of the steel sheet using the method of controlling the meandering of the steel sheet according to  claim 1 ; and   a cold rolling step of cold-rolling the steel sheet stored in the looper device.   
     
     
         6 . A manufacturing method for a steel sheet, the method comprising:
 a storage step of storing the steel sheet in a looper device while suppressing the meandering of the steel sheet using the method of controlling the meandering of the steel sheet according to  claim 1 ; and   an annealing step of annealing the steel sheet stored in the looper device.