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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。
In the cold-rolled continuous hot-dip galvanizing line, the control of the thickness of the hot-dip galvanized coating will directly affect the product quality, cost and market competitiveness of the hot dip galvanized sheet. Taking the continuous hot-dip galvanizing line in Ansteel as the background, the coating thickness of cold-rolled hot-dip galvanized strip was precisely controlled. The finite element analysis software FLUENT was used to simulate the blowing process of air knife. The main factors influencing the precision of coating thickness were analyzed. , The core model of coating thickness automatic control system is established, the air knife pressure feedforward control and Smith predictor compensation feedback control are proposed. The software of LABVIEW is used to develop the coating thickness control system to realize the precise control of coating thickness. Production data results show that the application of the control system to reduce the deviation of the coating thickness, and achieved good control effect. Through the coating thickness automatic control system put into operation, not only to meet the needs of enterprises to improve the surface quality of products, but also to save costs and reduce consumption of galvanized raw materials is of great significance.