620mm热轧AGC系统的研究与分析

发布时间：2018-11-19 09:12

【摘要】：带钢厚度尺寸误差的大小是衡量产品质量的一项关键指标。因此,对液压自动厚度控制系统(HAGC)的研究和改进是提高带钢产品质量的重要手段之一。论文重点对精轧厚度自动控制系统做了系统性研究和分析。主要研究了以下内容:(1)通过阅读大量有关连轧系统自动化和厚度自动控制系统的书籍和文献,了解了国内外厚度控制技术的发展历史及现状。(2)将可能影响带钢厚度的因素细分为29种。总结后归为入口轧件、轧机机架各设备、轧机控制系统三类干扰因素。如何克服这些干扰因素使其对带钢厚度的不利影响减小到最小,是我们研究板厚自控的方向和目标。(3)研究了轧辊的热膨胀和磨损补偿、轧辊偏心补偿、张力损失补偿、油膜厚度补偿、秒流量补偿和轧机刚度补偿等补偿方式;提出了GM-AGC、前馈AGC和监控AGC三种典型AGC控制方式的控制原理和优缺点。(4)通过对热轧带钢生产工艺流程的研究,基于现有自动化设备的配置,深入探讨和分析了基础自动化和过程自动化在厚度自动控制中起到的作用和效果。通过对现场投用AGC控制和未投用AGC控制的精轧出口带钢数据和曲线图进行比较、分析,未投用AGC时带钢实际厚度明显不均匀,波动较大,波动范围最大为±50μm;在同时投用了前馈AGC和监控AGC后,测得的带钢实测厚度波动范围明显变小,控制在±20μm以内,成品带钢厚度精度得到明显提高。
[Abstract]:The size error of strip thickness is a key index to measure product quality. Therefore, the research and improvement of hydraulic automatic thickness control system (HAGC) is one of the important means to improve the quality of strip steel products. This paper focuses on the systematic research and analysis of automatic thickness control system for finishing mill. The main contents are as follows: (1) by reading a large number of books and documents on automation and automatic thickness control system of continuous rolling mill system, The development history and present situation of thickness control technology at home and abroad are studied. (2) the factors that may affect the thickness of steel strip are divided into 29 kinds. After summing up, it is classified as three kinds of interference factors: inlet rolling piece, mill stand equipment and mill control system. How to overcome these interference factors to minimize the negative influence on strip thickness is the direction and goal of our research on automatic control of plate thickness. (3) the compensation of thermal expansion and wear, eccentric compensation and tension loss compensation of roll are studied. Oil film thickness compensation, second flow compensation and mill stiffness compensation. The control principle, advantages and disadvantages of three typical AGC control modes of GM-AGC, feedforward AGC and monitoring AGC are put forward. (4) based on the configuration of existing automation equipment, the process of hot strip production is studied. The function and effect of basic automation and process automation in automatic thickness control are discussed and analyzed. By comparing the data and curves of the finished rolled strip with or without AGC control and AGC control, it is found that the actual thickness of the strip is obviously uneven and fluctuates with the maximum range of 卤50 渭 m when the AGC is not used. After using feedforward AGC and monitoring AGC, the measured thickness fluctuation range of strip steel becomes smaller obviously, and the thickness accuracy of finished strip is obviously improved by controlling the thickness within 卤20 渭 m.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG333

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