Study On 5-stand Tandem Cold Rolling Mill Control System

Along with the development of science and technology, people are becoming more and more select with the types and qualities of strip, the production of which accounts for a considerable proportion of the national economy. A high-performance controlling system of tandem cold rolling can not only make the operation much easier, but also assure a high-quality production of the strip and realize the optimal allocation of the system, improving productivity and decreasing energy consumption. The major research of this paper goes as follow:By studying the 2030mm tandem cold rolling product line of Baosteel, this research aims to better understand the whole process of strip production and probe into the deformation process of rolling. After that, mathematical models of the rolling force, deformation resistance, friction, elastic flattening and rolling moment will be established, laying a foundation for the later study of the system.The optimization of production scheduling plays an important role in the process of tandem cold rolling. An appropriate design of production scheduling can not only add to the performance of the motor, but also improve the productivity and extend its service life. As the phenomena of nonlinear coupling appears in the process is quite complicated, this research will introduce the arithmetic of Quantum-behaved Particle Swarm Optimization to optimize the controlling object, which can prevent the study from falling into an endless exploration of the rolling rules and thus largely simplify the calculation. The MATLAB simulation has testified that QPSO has a blistering convergence speed and high calculation accuracy, which well meets the demand of high-speed on-line controlling.To meet the performance requirements raised by the computer control system, the author develops four core systems, respectively being that of pressure control, speed control, tension control and thickness control, and carries out a configuration of the whole net system. To meet the requirement of high-speed control during the rolling process, this paper chooses TDC as its control centre and use CFC language to write programs as to realize the HMI configuration and date exchange.Finally, a test is employed to the system, which testifies the feasibility of the control system and thus lays a valid foundation for any further study.