铝热连轧跑偏控制模型及应用研究

发布时间：2018-08-19 20:00

【摘要】：铝热连轧跑偏控制是迫切需要解决的技术难题。本文结合“3104宽幅热轧卷跑偏控制策略研究”课题,以某铝板带生产线为依托,展开了铝热连轧的跑偏控制模型及应用研究,提出了适用于现场的纠偏控制和自适应控制策略。主要的研究内容和研究成果如下： 1、)在热连轧板带跑偏演变机理的研究基础上,提出了以轧制前后是否满足恒定楔形率作为轧件跑偏控制的依据。(1)建立了轧件轧制过程楔形的观测模型,选择由恒楔形率计算出来的目标楔形与由观测模型所计算出来的轧件出口楔形差作为轧件跑偏的观测量；(2)依据该观测量建立了轧件跑偏状态的判据,根据判据能准确判断轧件的跑偏状态,并实现了对轧件跑偏的开环控制；(3)以MATLAB软件中的Simulink工具为平台,建立了轧件的跑偏数学模型。 21根据热连轧生产线的横向非对称特征,提出了以辊缝差调整的平衡控制方法。(1)针对四辊轧机铝热连轧工艺过程的第一道和第二道轧制时板带跑偏,进行调控仿真,得到可以采用调整辊缝差的方法对跑偏进行控制；(2)以轧件厚差为控制目标,以轧制力差为观察量,以辊缝差为调整量的厚度平衡控制模型；(3)建立了以两侧辊缝差为调节量的辊缝差量分配模型。 31将所建立的跑偏控制模型应用于铝热连轧生产现场,提出了适用于实际生产的跑偏控制策略。(1)将轧制过程的跑偏调控方案应用于各机架,得到各机架的头部和尾部纠偏图,得出的结果验证了跑偏控制方法的正确性；(2)将跑偏反馈模型应用于机架之间,通过反馈前后轧制力差大小进行比较分析,得出反馈纠偏效果良好；(3)研发有自主知识产权的应用于板带热连轧生产线的纠偏控制系统,为实际生产提供了一个基于轧制力差的辊缝调节跑偏控制策略。 41在跑偏控制研究的基础上,借助MSC.Marc有限元分析软件模拟研究轧制过程中轧机后张力的改变对其跑偏量的影响规律,并对非对称因素扰动下的尾部纠偏进行仿真。将调节后张力与未调节后张力两种情况下的数值模拟情况进行比较,得到通过后张力的改变可以在一定程度上抑制轧件的跑偏。 51建立了轧制过程尾部跑偏模式的神经网络识别模型,开发了基于现场数据的轧制力差回归调整曲线库。以3104铝材为例进行了仿真实验及应用,实现了生产线的有效纠偏,达到了预期纠偏的目的。
[Abstract]:The control of running deviation of hot strip mill is an urgent technical problem to be solved. In this paper, based on the subject of "study on the Control Strategy of running deviation of 3104 wide Hot Rolling coils", based on a certain aluminum strip production line, the model and application research of running deviation control of hot strip mill are carried out, and the deviation correction control and adaptive control strategy suitable for the field are put forward. The main research contents and results are as follows: 1. On the basis of the research on the evolution mechanism of strip deviation in hot strip rolling, Whether the constant wedge rate is satisfied before and after rolling is used as the basis for the control of the roll deviation. (1) the observation model of the wedge in the rolling process is established. The target wedge calculated from the constant wedge ratio and the wedge difference at the end of the piece calculated by the observation model are selected as the observation quantity of the deviation of the rolling piece. (2) based on the observed value, the criterion of the state of the deviation of the rolling piece is established. According to the criterion, the deviation state of workpiece can be judged accurately, and the open-loop control is realized. (3) the Simulink tool in MATLAB software is used as the platform. The mathematical model of deviation of rolling piece is established. 21 according to the transverse asymmetric characteristics of hot strip production line, The balance control method of adjusting roll gap difference is put forward. (1) aiming at the first and second strip running deviation of aluminum hot continuous rolling process of four-high rolling mill, the control simulation is carried out, and the method of adjusting roll gap difference can be used to control the running deviation; (2) the thickness balance control model, which takes the thickness difference of rolling piece as the control target, the difference of rolling force as the observation quantity and the gap difference of roll as the adjustment quantity; (3) the distribution model of roll gap difference is established, which takes the gap difference between two sides as the adjusting quantity. 31. The established model is applied to the production site of hot strip aluminum rolling. Put forward the control strategy of running deviation suitable for actual production. (1) apply the scheme of running deviation control in rolling process to each stand, obtain the head and tail deviation correction diagram of each frame, and get the result to verify the correctness of the running deviation control method; (2) the deviation feedback model is applied to the stand, the difference of rolling force before and after feedback is compared and analyzed, and the result of feedback correction is good. (3) A deviation correction control system with independent intellectual property is developed, which is used in strip hot strip production line. A control strategy of roll gap adjustment and deviation control based on rolling force difference is provided for practical production. 41 based on the research of running deviation control, By means of MSC.Marc finite element analysis software, the influence of the change of rolling mill post-tension on the deviation of rolling mill is studied, and the tail deviation correction under the disturbance of asymmetric factors is simulated. The numerical simulation of the tension after adjustment is compared with that of the unadjusted tension. It is concluded that the change of post-tension can restrain the deviation of rolling parts to a certain extent. 51 the neural network recognition model of tail deviation pattern in rolling process is established, and the rolling force difference regression adjustment curve library based on field data is developed. Taking 3104 aluminum as an example, the simulation experiment and application are carried out, and the effective deviation correction of the production line is realized, and the expected correction goal is achieved.
【学位授予单位】：中南大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TG339

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