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对四机架冷连轧机的自动厚度控制(AGC)系统的原理进行了分析并论述了实施方法。在对四机架冷连轧机进行技术改造中,改进了该连轧机原有的压下机构,改原来的电动压下为液压压下,进行厚度调节,原来的电动压下只用来进行换辊之后的调整轧制线用。为消除厚度偏差,在厚度控制系统中设了两个微机子系统。第一机架为闭环系统,它有三个功能。粗调AGC主要是在第一机架消除坯料的各种波动,以达到预定的比较精确的厚度。因此在后几架采用了接近等压条件的轧制控制方式,以获得最佳的厚度和板形的综合指标。由于磨损和温度变化对轧辊的影响,同时也影响了成品厚度的误差,这些误差经第四机架出口测厚仪检测,将信息反馈给DIR 4微机子系统,由计算机按设定的模型通过调节第四机架或第三机架的工艺参数,来消除这些误差,这是由连轧机的精调系统来完成的。
The principle of automatic thickness control (AGC) system of four-stand tandem cold mill is analyzed and discussed. In the four-stand tandem cold mill for technological innovation, improved the rolling mill original depressing mechanism, change the original electric pressure is hydraulic pressure, the thickness of the adjustment, the original electric pressure only for the change Roller after the adjustment of the rolling line. In order to eliminate the thickness deviation, two microcomputer subsystems are set up in the thickness control system. The first rack is a closed-loop system that has three functions. Coarse AGC is mainly in the first rack to eliminate the various fluctuations in the billet in order to achieve a predetermined more accurate thickness. Therefore, in the latter few adopt a near-equal-pressure conditions of the rolling control, in order to obtain the best thickness and shape of a comprehensive index. Due to wear and temperature changes on the impact of the roll, but also affect the thickness of the finished product error, these errors through the fourth rack outlet gage detection, the information back to the DIR 4 microcomputer subsystem, the computer according to the model set by Adjust the fourth rack or third rack of the process parameters, to eliminate these errors, which is by the mill finishing system to complete.