Research On Application Of Tension Control System "1+4" Aluminum Hot Rolling Mills

Based on the transforming program of “1+4” aluminum hot rolling mills unit in onefactory of Henan, we did the further research on the lacing,the tension establishment andcontrol method of the finishing mill, including coiler tension and continuous rollingtension of finishing mill group. We also made the detailed analysis of master-slave controlprinciple, control method and improved method of the main drive system and finished theoptimization of the tension controller of finishing mill group.Firstly, we selected the multi-motor synchronous drive as the research object andproposed two different types of coaxial dual-motor drive with master-slave controlmethods through analyzing work principle, and achieved the allocation rules between theload torque and the moment of inertia. The first problem that the motor synchronous drivemust solve is load balancing and the accuracy of speed regulation. Therefore, in order toreduce dynamic deviation of the two running motors, this paper proposed torque dynamiccompensation with the deviation coupling control method. It means that the output of thedeviation coupling controller compensates the torque ring given of master-slave motor.Secondly, the principle and control method of coiler tension generation were brieflyanalyzed and control method of the aluminum hot rolling tension was elaborated. Thefactors affecting tension variation was analyzed. Considering influence of tension onforward slip value, the tension formula of continuing rolling process was improved. Thetension forming process of continuing hot rolling from stand F1to F4was simulated, andthe tension diagrams of the four stands were constructed.Finally, we improved the control method of the aluminum hot rolling tension. Due tonon-linear relation of the aluminum hot rolling mills tension system, the coupling normalPID control could not meet the requirement of the system. Therefore, the mixed control ofCerebellar Model Articulation Controller (CMAC) coupled with PID was proposed andthe CMAC algorithm was also improved to solve the problem of online parameters control.By simulation, it could be found that the application of CMAC significantly reducedsurplus adjustment, transition time, and tension coupling degree among stands was also reduced.