Strip width controller for reversible rolling mill

Abstract

A strip width controller for a reversible rolling mill includes a rolling controller, a rolling position detector, a tracker, and a calculator. The rolling controller operates an edger so that a pair of edger rolls comes into contact with a strip to be rolled during reverse pass rolling. The rolling position detector detects a rolling position of the edger when the pair of edger rolls are in contact with the strip to be rolled during the reverse pass rolling. The tracker tracks a longitudinal position of the strip to be rolled during the reverse pass rolling. The calculator calculates strip width result values at a plurality of positions in the longitudinal direction of the strip to be rolled based on an output of the rolling position detector and an output of the tracker.

1 . (canceled) 
     
     
         2 . (canceled) 
     
     
         3 . A strip width controller for a reversible rolling mill comprising an edger having a pair of edger rolls for width-rolling a strip to be rolled and a horizontal rolling mill having a pair of horizontal rolls disposed downstream of the edger for horizontal-rolling the strip to be rolled, the strip width controller comprising:
 a rolling controller configured to operate the edger so that the pair of edger rolls comes into contact with the strip to be rolled during reverse pass rolling;   a rolling position detector configured to detect a rolling position of the edger when the pair of edger rolls are in contact with the strip to be rolled during the reverse pass rolling;   a tracker configured to track a longitudinal position of the strip to be rolled during the reverse pass rolling; and   a strip width result calculator configured to calculate strip width result values at a plurality of positions in a longitudinal direction of the strip to be rolled based on an output of the rolling position detector and an output of the tracker,   wherein the rolling controller is configured to repeatedly execute:
 operating the edger so as to reduce a distance between the pair of edger rolls from a state in which the pair of edger rolls are not in contact with the strip to be rolled, 
 monitoring a load measurement value of the edger to detect that the load measurement value reaches a load target value as contact of the pair of edger rolls with the strip to be rolled, and 
 operating the edger to increase the distance between the pair of edger rolls when contact of the pair of edger rolls with the strip to be rolled is detected. 
   
     
     
         4 . A strip width controller for a reversible rolling mill comprising an edger having a pair of edger rolls for width-rolling a strip to be rolled and a horizontal rolling mill having a pair of horizontal rolls disposed downstream of the edger for horizontal-rolling the strip to be rolled, the strip width controller comprising:
 a rolling controller configured to operate the edger so that the pair of edger rolls comes into contact with the strip to be rolled during reverse pass rolling;   a rolling position detector configured to detect a rolling position of the edger when the pair of edger rolls are in contact with the strip to be rolled during the reverse pass rolling;   a tracker configured to track a longitudinal position of the strip to be rolled during the reverse pass rolling;   a strip width result calculator configured to calculate strip width result values at a plurality of positions in a longitudinal direction of the strip to be rolled based on an output of the rolling position detector and an output of the tracker; and   a strip width meter disposed downstream of the edger and configured to measure a strip width of the strip to be rolled,   wherein the strip width result calculator is configured to correct the strip width result value using a strip width predicted from a measured value of the strip width meter and a width spread amount by horizontal rolling.   
     
     
         5 . A strip width controller for a reversible rolling mill comprising an edger having a pair of edger rolls for width-rolling a strip to be rolled and a horizontal rolling mill having a pair of horizontal rolls disposed downstream of the edger for horizontal-rolling the strip to be rolled, the strip width controller comprising:
 a rolling controller configured to operate the edger so that the pair of edger rolls comes into contact with the strip to be rolled during reverse pass rolling;   a rolling position detector configured to detect a rolling position of the edger when the pair of edger rolls are in contact with the strip to be rolled during the reverse pass rolling;   a tracker configured to track a longitudinal position of the strip to be rolled during the reverse pass rolling;   a strip width result calculator configured to calculate strip width result values at a plurality of positions in a longitudinal direction of the strip to be rolled based on an output of the rolling position detector and an output of the tracker; and   a strip width meter disposed upstream of the edger and configured to measure a strip width of the strip to be rolled,   wherein the strip width result calculator is configured to correct the strip width result value using a measured value of the strip width meter.   
     
     
         6 . The strip width controller for a reversible rolling mill according to  claim 4 , further comprising
 a rolling position correction calculator configured to calibrate an error of a gap between the pair of edger rolls based on the strip width result value corrected using the strip width predicted from the measured value of the strip width meter and the width spread amount by the horizontal rolling.   
     
     
         7 . The strip width controller for a reversible rolling mill according to  claim 5 , further comprising
 a rolling position correction calculator configured to calibrate an error of a gap between the pair of edger rolls based on the strip width result value corrected using the measured value of the strip width meter.