Cold rolling method and cold rolling equipment

Abstract

A cold rolling method includes: a calculation step of calculating a leveling amount of a rolling mill using an out-of-plane deformation amount of a steel sheet measured on an upstream side of the rolling mill; a control step of controlling leveling of the rolling mill on a basis of the leveling amount calculated in the calculation step; and a cold rolling step of applying cold rolling to the steel sheet using the rolling mill controlled by the control step.

1 . A cold rolling method comprising:
 a calculation step of calculating a leveling amount of a rolling mill using an out-of-plane deformation amount of a steel sheet measured on an upstream side of the rolling mill;   a control step of controlling leveling of the rolling mill on a basis of the leveling amount calculated in the calculation step; and   a cold rolling step of applying cold rolling to the steel sheet using the rolling mill controlled by the control step.   
     
     
         2 . The cold rolling method according to  claim 1 , wherein the out-of-plane deformation amount of the steel sheet is an out-of-plane deformation amount measured on the upstream side of the rolling mill and immediately upstream or immediately downstream of a steering device that changes a conveying direction of the steel sheet. 
     
     
         3 . The cold rolling method according to  claim 1 , wherein, when the out-of-plane deformation amount of the steel sheet measured on the upstream side of the rolling mill exceeds a threshold value, the cold rolling is not performed on the steel sheet in the cold rolling step. 
     
     
         4 . The cold rolling method according to  claim 1 , wherein
 in the calculation step,   the leveling amount is calculated using a value obtained as a result of applying a leveling amount calculation program to the out-of-plane deformation amount, and   the leveling amount calculation program is a machine-learned program using each out-of-plane deformation amount of a plurality of steel sheets as an input variable and each leveling amount obtained as a result of physical simulation with respect to each out-of-plane deformation amount as an objective variable.   
     
     
         5 . The cold rolling method according to  claim 3 , wherein
 in the calculation step,   the leveling amount is calculated using a value obtained as a result of applying a leveling amount calculation program to an out-of-plane deformation amount of the steel sheet, and   the leveling amount calculation program is a machine-learned program using each out-of-plane deformation amount of a plurality of steel sheets as an input variable and each leveling amount obtained as a result of physical simulation with respect to each out-of-plane deformation amount as an objective variable.   
     
     
         6 . The cold rolling method according to  claim 1 , wherein
 in the calculation step,   the leveling amount is calculated using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill.   
     
     
         7 . The cold rolling method according to  claim 3 , wherein
 in the calculation step,   the leveling amount is calculated using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill.   
     
     
         8 . The cold rolling method according to  claim 4 , wherein
 in the calculation step,   the leveling amount is calculated using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill.   
     
     
         9 . The cold rolling method according to  claim 5 , wherein
 in the calculation step,   the leveling amount is calculated using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill.   
     
     
         10 . A cold rolling equipment comprising:
 a rolling mill that applies cold rolling to a steel sheet;   a shape measurement device that is disposed on an upstream side of the rolling mill and measures an out-of-plane deformation amount of the steel sheet;   a calculation device that calculates a leveling amount of the rolling mill using the out-of-plane deformation amount of the steel sheet measured by the shape measurement device; and   a control device that controls leveling of the rolling mill on a basis of the leveling amount calculated by the calculation device.   
     
     
         11 . The cold rolling equipment according to  claim 10 , further comprising
 a steering device that is disposed on the upstream side of the rolling mill and changes a conveying direction of the steel sheet, wherein   the out-of-plane deformation amount of the steel sheet is an out-of-plane deformation amount measured on the upstream side of the rolling mill and immediately upstream or immediately downstream of the steering device.   
     
     
         12 . The cold rolling equipment according to  claim 10 , wherein, when the out-of-plane deformation amount of the steel sheet measured on the upstream side of the rolling mill exceeds a threshold value, the rolling mill does not execute the cold rolling on the steel sheet. 
     
     
         13 . The cold rolling equipment according to  claim 10 , wherein
 the calculation device calculates the leveling amount using a value obtained as a result of applying a leveling amount calculation program to the out-of-plane deformation amount, and   the leveling amount calculation program is a machine-learned program using each out-of-plane deformation amount of a plurality of steel sheets as an input variable and each leveling amount obtained as a result of physical simulation with respect to each out-of-plane deformation amount as an objective variable.   
     
     
         14 . The cold rolling equipment according to  claim 12 , wherein
 the calculation device calculates the leveling amount using a value obtained as a result of applying a leveling amount calculation program to the out-of-plane deformation amount, and   the leveling amount calculation program is a machine-learned program using each out-of-plane deformation amount of a plurality of steel sheets as an input variable and each leveling amount obtained as a result of physical simulation with respect to each out-of-plane deformation amount as an objective variable.   
     
     
         15 . The cold rolling equipment according to  claim 10 , wherein the calculation device calculates the leveling amount using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill. 
     
     
         16 . The cold rolling equipment according to  claim 12 , wherein the calculation device calculates the leveling amount using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill. 
     
     
         17 . The cold rolling equipment according to  claim 13 , wherein the calculation device calculates the leveling amount using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill. 
     
     
         18 . The cold rolling equipment according to  claim 14 , wherein the calculation device calculates the leveling amount using an out-of-plane deformation amount of the steel sheet on the upstream side of the rolling mill and an out-of-plane deformation amount of the steel sheet measured on a downstream side of the rolling mill.