CONTROLLING EQUIPMENT AND CONTROLLING METHOD FOR TANDEM ROLLING MILL

摘要

PROBLEM TO BE SOLVED: To provide a controlling equipment and controlling method for a tandem rolling mill having good maintenance property at a low cost and also obtaining a high quality strip. SOLUTION: A first model 11 is expressed by the equation dΔPB/dt=(-1/ TB)ΔPB+KB/TB.ΔUB.ΔCM=KC.ΔPB, in which a control amount of rolling stands 1 to 4 and an actual adjusting amount areΔUB andΔPB respectively, and a calculated fluctuating value of a crown profile of a plate isΔCM. However, KB and TB are a gain and time constant when the adjusting amountΔPB is approximated by a primary delay corollary. KC is an influence coefficient of which the crown profile of a plate is influenced by the adjusting amount. A second model 12 is expressed byΔCS=ΔCM.e-LS, in which the calculated fluctuating value of the crown profile of the plate directly under a crown meter 5 isΔCS and detection idling time of the crown meter 5 is L. More precise control of the crown profile of the plate can be performed upon use of these models 11 and 12.