Coil Spring Strip Hot Tandem Rolling Control System Design

With the development of modern industry, demands of strip’s quality and quantity are also constantly being improved. Therefore, high-quality and precise rolling technology becomes the key research point of auto-rolling. In this paper, a spring factory coil spring strip hot tandem rolling production automation control systems development projects was taken for the background. Rolling control system was designed and key factors impacting on the quality of rolling was analyzed. Intelligent control algorithm to improve the quality of the tandem rolling production was proposed.Firstly, the basic principle of rolling was analyzed. The relationship of thickness of the rolling and elastic-plastic rolling curve was studied. And rolling thickness feedback control was applied to control thickness of rolled piece. In order to avoid the time lag of feedback control, the Smith predictor control was used to compensate the time lag and the principle of a model reference adaptive wad added to Smith algorithm to reduce the sensitivity to the model. Secondly, the mechanism of tension generated by rolling was analyzed and the important role of the tension in the rolling process was explained. The mathematical model of tension based on speed control was established. And the CMAC network was introduced to the conventional PID tension control. Its advantages are small amount of computation, learning fast, easy software and hardware, etc. Tension real-time control of CMAC and PID control adapted to the hot rolling had been formed.The automatic gauge control and tension control of hot tandem rolling system were simulated by Matlab/Simulink in this paper. Simulation results showed that the model reference adaptive Smith predictor control solved the time lag problem of the feedback automatic gauge control and the shortcomings of Smith predictive control of sensitivity to the model; CMAC+PID control to a large extent reduced tension control overshoot and regulation time. Simulation results showed that it had a good control effect. Finally, the tandem hot ralling control system hardware, software programming and HMI were designed.