'INTERSTAND COOLING CONTROLLER AND CONTROL METHOD FOR HOT ROLLING MILL'

摘要

In control of a cooling water-injection type interstand cooling unit for the finishing mill, for controlling with higher precision a strip temperature on a delivery side of the finishing mill and decreasing the frequency of increasing/decreasing a cooling spray flow, an interstand cooling controller 1 comprises a preset control section 11 controlling an amount of a cooling spray flow of each of interstand cooling units 7a to 7d in a finishing mill 2 so that an FDT (finishing mill delivery strip temperature) of a strip 3 becomes identical to a desired target temperature, predicting the FDT with a strip temperature prediction model 18 before the strip is cooled by cooling water, and calculating the amount of the cooling spray flow of the interstand cooling unit based on the predicted FDT to thereby generate a preset control output; a dynamic control section 12 acquiring a state quantity of the strip under rolling and calculating a change amount of the cooling spray flow based on the state quantity to thereby generate a dynamic control output; and, an interstand cooling command generation section 13 generating and outputting an interstand cooling command from the preset control output and the dynamic control output.