Patent ID: 6606534
Filing Date: 2003-08-12
Classification: B21B,G05D

Abstract:
A strip thickness control apparatus for a rolling mill, comprising:a strip thickness gauge, provided on a delivery side of said rolling mill, for measuring a thickness of a strip; moving distance calculating means for calculating a moving distance of the strip from said rolling mill; rolling roll angle-of-rotation calculating means for calculating an angle of rotation of said rolling roll; strip thickness deviation calculating means for calculating a deviation between a strip thickness target value and the value of the strip thickness measured by said strip thickness gauge; strip thickness deviation storage means for storing the strip thickness deviation by adding it for every angle of rotation of said rolling roll; strip thickness deviation input determining means for determining an input timing for inputting the strip thickness deviation to said strip thickness deviation storage means on the basis, of the moving distance of the strip and the angle of rotation of said rolling roll, said strip thickness deviation input determining means determining the input timing by compensating for a delay in the measurement by said strip thickness gauge and delays in signal transmission and in calculation; strip thickness deviation output determining means for determining an output timing for outputting the strip thickness deviation stored in said strip thickness deviation storage means on the basis of the angle of rotation of said rolling roll, said strip thickness deviation output determining means determining the output timing by compensating for a response delay of a roll gap controller; and manipulated variable calculating means for fetching the strip thickness deviation stored in said strip thickness deviation storage means at the output timing determined by said strip thickness deviation output determining means, and determining a manipulated variable of the roll gap controller of said rolling mill, which eliminates the strip thickness deviation.