高精度冷連軋厚度控制策略的研究與應(yīng)用
[Abstract]:Thickness accuracy is one of the most important dimensional accuracy of cold continuous strip rolling, and automatic thickness control is always an indispensable part in cold tandem rolling production. In this paper, based on the construction project of 1450mm five-stand cold tandem mill in a thin sheet Science and Technology Co., Ltd., the model setting system, hydraulic actuator control system, inter-stand tension control system and thickness automatic control system are studied. A comprehensive control strategy for the thickness of cold continuous rolling is established and applied to the production practice, and good results are obtained. The main contents are as follows: (1) according to the characteristics of cold continuous rolling process, the mathematical model of on-line engineering application is studied. In order to ensure the precision of model setting and solve the problem that the traditional method is difficult to solve, a simple finite element method is used to calculate the rolling parameters. In order to improve the precision of roll gap pre-setting, a new spring model of cold tandem mill is adopted. An optimization model of multi-objective rolling schedule based on cost function is developed by considering the important factors in the process of cold continuous rolling. (2) the control system of tension between hydraulic actuator and stand is studied. The position control mode, rolling force control mode and single side control mode of hydraulic pressing system are analyzed, and the control strategies of hydraulic bending roll system and hydraulic roll transverse movement system are deeply analyzed. Aiming at the characteristics of servo nonlinearity and servo zero offset, the corresponding compensation control strategy is developed. Based on the dynamic tension threshold, the inter-stand tension control strategy is proposed, and the normal tension control closed-loop and the limit tension control closed-loop are studied respectively. (3) combined with the instrumentation configuration of the rolling mill, The automatic thickness control system of five stand cold continuous rolling mill is designed and established. By setting various types of AGCs in the first and second stands, the thickness deviation of most of the spikes is eliminated in the front frame. Various AGC control strategies are used in the final stand and the thickness accuracy of the finished product is ensured according to different rolling strategies. The rolling force compensation control of the end stand is developed and the control precision of the rolling force is ensured on the basis of optimizing the thickness and tension control mode. A dynamic load balancing control is proposed to prevent the overloading of a frame. In order to improve the performance of AGC system, the modified Smith predictive compensation control and auxiliary feedback iterative learning control are introduced into the monitoring AGC system to ensure the efficient and reasonable execution of the speed adjustment process of the frame by using the speed correction control. (4) in order to improve the performance of the monitoring AGC system, the improved Smith predictive compensation control and the auxiliary feedback iterative learning control are introduced into the monitoring AGC system. The theoretical model of monitoring AGC inner loop system is established. In order to solve the problem of poor response speed and adjustment precision of conventional Smith predictive monitoring AGC system caused by the singularity of controller, an improved strategy of Smith predictive compensation control is proposed. Based on this, an improved Smith predictive monitoring AGC system based on auxiliary feedback iterative learning control is designed, which effectively makes up for the shortcoming that the performance of Smith predictive monitoring AGC system depends on the model accuracy. Through the simulation experiment, the control effect of the three kinds of monitoring AGC system is analyzed. (5) the control effect of hydraulic pressure control system and frame tension control system is analyzed by using the field actual curve. The thickness control effect of typical thickness gauge strip steel and extremely thin tinning coil is analyzed, and the effect of the thickness control strategy is evaluated persuasively. The research results of this paper have strong practicability for the thickness control of cold continuous rolling process. At present, the thickness control strategy has been successfully applied to the 1450mm five-stand tandem cold rolling mill in a thin sheet Science and Technology Co., Ltd., which is of great significance to the development of the thickness control system with independent intellectual property rights in China.
【學(xué)位授予單位】:東北大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:TG334.9
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