冷轧热镀锌镀层厚度控制系统的开发与应用

在冷轧连续热镀锌生产线上，热镀锌镀层厚度的控制水平将直接影响到热镀锌板的产品质量、成本和市场竞争力。以鞍钢连续热镀锌生产线为背景，对冷轧热镀锌带钢的镀层厚度进行精确控制研究，利用有限元分析软件FLUENT对气刀吹锌过程进行数值模拟，分析影响镀层厚度精度的主要因素，建立镀层厚度自动控制系统的核心模型，提出气刀压力前馈控制和Smith预估补偿反馈控制方法，采用LABVIEW软件开发镀层厚度控制系统，实现镀层厚度精确控制。生产数据结果表明，控制系统的应用降低镀层厚度偏差，取得了较好的控制效果。通过镀层厚度自动控制系统的投入运行，不仅满足企业提高产品表面质量的需求，而且对节约成本、降低镀锌原料消耗具有重要意义。

Development and application of coating thickness control system for cold rolling continuous galvanizing line

For the cold rolling continuous galvanizing line,the control level of the coating thickness has a direct effect on the product quality,the cost and the market competition of hot galvanized sheet. Based on the background of Ansteel continuous galvanizing line,the current study mainly involved the research on the precise control of zinc coating thick-ness of cold-rolled sheet.The main factor influencing the precision of coating thickness was analyzed by means of the software FLUENT for the numerical simulation in gas-jet wiping process.The key model of coating thickness control sys-tem has been built with the adoption of air knife pressure feedforward control and Smith predictive compensation control methods. The coating thickness precise control was realized by adopting the software LABVIEW for the system develop-ment. Production results show that the application of the control system reduced the deviation of coating thickness and obtained well control effect. The application of coating thickness automatic control system not only meets the demand of improving product surface quality,but also provides an important significance on cost saving and reducing the zinc raw material consumption .