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为了提高板形控制精度,对凸度平坦度控制耦合关系以及板形板厚控制耦合关系进行深入的研究分析,并采用相应的解耦控制策略是十分必要的。在板形板厚解耦设计的基础上,分析了不同控制方案下凸度平坦度控制之间的耦合影响关系,建立了相应的凸度平坦度耦合模型,并对其耦合特性进行了分析比较;之后,针对耦合模型特点进行凸度平坦度半解耦设计,以补偿凸度控制和平坦度控制之间的耦合影响关系,进而设计凸度平坦度解耦控制系统,并给出热连轧机组凸度平坦度解耦控制应用策略,组成完整的动态板形控制系统。在某厂1 580 mm四辊七机架热连轧机组投入使用后,较好地补偿了板形板厚控制、凸度平坦度控制之间的耦合影响关系,板形控制精度明显提高。
In order to improve the control accuracy of flatness, it is very necessary to study the coupling relationship of flatness control of convexity and the coupling relationship of flatness control of flatness, and to adopt the corresponding decoupling control strategy. Based on the plate thickness decoupling design, the relationship between the coupling degree of crown flatness under different control schemes is analyzed, and the corresponding coupling degree of crown flatness is established, and their coupling characteristics are analyzed and compared After that, the semi-decoupling design of convexity flatness is carried out according to the characteristics of the coupled model to compensate the influence of the coupling between the crowning control and the flatness control, and then the control system of the crown flatness decoupling is designed, and the hot rolling Unit convexity flatness decoupling control strategy, composed of a complete dynamic shape control system. After the 1 580 mm four-high and seven-stand hot strip mill in a certain plant was put into operation, the coupling influence between the plate thickness control and the crown flatness control was well compensated, and the shape control precision was obviously improved.