| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the accuracy of thickness of a material to be rolled to the change in the environment and condition of rolling or the like. SOLUTION: This controller is constituted so that the PID control calculation of the locational deviation between the reference signals of hydraulic cylinders 3op , 3dr at two positional points of a work roll 1 and position detecting signals of the position detectors 13op , 13dr of each hydraulic cylinder is executed and, after transforming calculated output into current reference, the opening degree offvalve of a servo valve 20op is controlled and the position control of each hydraulic cylinder is executed. In such a case, deviations between rolling state monitoring control circuit 41 for monitoring the rolling state and containing control-circuit 42 for deciding containing conditions in the servo valve as protecting operation based on monitored results with this monitoring means and between the current reference to a servo amplifier and the current feedback input are determined and, when these deviations are over prescribed allowable ranges, a means 44 for executing containing operation of the servo valve according to the conditions of the containing control-circuit and means 43 for controlling returning operation after this containment of the servo valve are provided.</p> |
