镁合金可逆温轧机恒张力控制系统的研究

发布时间：2018-04-30 11:16

  本文选题：镁合金 + 卷取机　； 参考：《辽宁科技大学》2015年硕士论文

【摘要】：近年来,我国工业现代化发展进程迅速,镁合金逐渐受到重视,不断扩大应用领域,具有十分广阔的前景,尤其在需求轻量化材质的领域中,如3C电子、汽车以及航天航空等行业。镁合金优点在于其产品具有重量轻、良好的机械性能和耐腐蚀等等。因此,镁合金的研究重点是镁合金薄板带材的研发和生产。作为生产过程的最末道工序,卷取技术的控制精度对最终产品的质量产生直接影响。卷取张力的施加对板形质量和厚度精度都有很大影响,因此,保证卷取张力的稳定性是我们研究的目标和方向。本文以我校镁合金实验研究中心的可逆六辊温轧机为实验背景,深入研究轧制镁合金薄带过程中,张力控制系统的特点和控制手段,最终实现恒张力卷取的控制任务。论文首先根据张力的产生原理及几种张力控制方式的对比,选择基于恒线速度的恒张力控制方法。仔细分析整体控制系统后,建立相关的数学模型。针对卷取电机在变速时以及直径改变的过程中产生的张力波动,提出补偿动态力矩以及计算瞬时卷径。根据工况实验,结合相关的检测仪表建立可逆六辊温轧机工艺参数监测系统,并利用西门子S7-200的工控设备,将现场实时运行情况以及过程数据通过人机界面进行实时显示以便于监控。由于镁合金薄带轧制工艺技术的复杂性,并且张力系统的时变参数问题,采用传统PID控制不能完全达到最佳的控制效果,因此研讨在张力控制系统中加入增益自调节PID算法。根据现场具体参数,分别仿真并分析对基于常规PID控制系统和基于增益自调度PID控制系统,结果说明自调节PID控制方式具有更好动态性能和鲁棒性,可避免系统性能受参数变化影响。最后根据工艺要求以及控制原理编制程序到PLC,并且建立友好的人机界面,通过采集、处理和分析实验数据,结果表明控制算法可行有效。因此,本文为今后实际轧制加入自适应控制手段和完善张力控制系统设备提供理论上的支持,并且对张力控制系统计算机仿真的更深入研究奠定了理论基础。
[Abstract]:In recent years, with the rapid development of industrial modernization in China, magnesium alloys have been paid more and more attention to, and their applications have a broad prospect, especially in the field of lightweight materials, such as 3C electronics. Automotive and aerospace industries. Magnesium alloy has the advantages of light weight, good mechanical properties and corrosion resistance. Therefore, the research focus of magnesium alloy is the R & D and production of magnesium alloy sheet and strip. As the final process of the production process, the control precision of the coiling technology has a direct impact on the quality of the final product. The application of coiling tension has great influence on the shape quality and thickness accuracy. Therefore, it is our goal and direction to ensure the stability of coiling tension. In this paper, based on the reversible six-high temperature rolling mill of magnesium alloy experimental research center in our school, the characteristics and control methods of tension control system in rolling magnesium alloy strip are studied in depth, and the control task of constant tension coiling is finally realized. Firstly, according to the principle of tension generation and the comparison of several tension control methods, a constant tension control method based on constant linear velocity is selected. After careful analysis of the overall control system, the related mathematical model is established. In view of the tension fluctuation caused by the coiling motor in the process of changing speed and changing the diameter, the dynamic torque compensation and the calculation of instantaneous winding diameter are proposed. According to the working condition experiment, the monitoring system for the process parameters of reversible six-high temperature mill is established by combining the relevant measuring instruments, and the industrial control equipment of Siemens S7-200 is used. The real-time operation and process data are displayed through the man-machine interface to facilitate monitoring. Because of the complexity of rolling technology of magnesium alloy strip and the time-varying parameters of tension system, the traditional PID control can not achieve the best control effect, so the gain self-adjusting PID algorithm is studied in the tension control system. According to the specific parameters in the field, the simulation and analysis of the conventional PID control system and the gain based self-scheduling PID control system are carried out respectively. The results show that the self-regulating PID control method has better dynamic performance and robustness. The system performance can be avoided by the change of parameters. Finally, according to the process requirements and the control principle, the program is compiled to PLC, and a friendly man-machine interface is established. The experimental data are collected, processed and analyzed. The results show that the control algorithm is feasible and effective. Therefore, this paper provides theoretical support for practical rolling to add adaptive control means and perfect tension control system equipment, and lays a theoretical foundation for further research on computer simulation of tension control system.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG333
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本文编号：1824349