Abstract: Using FEM, based on accurate calculation of mechanical strip crown and calculated results validation, genetic coefficient of the crown genetic equation is analyzed through analytical theory of plate shape stiffness and the strip crown equation is established. Then, the change rule of hot rolling mill real-time rolls integrated crown is predicted within a rolling unit through using the actual production process parameters in turn to calculate the strip crown of each stand mill and comparing strip crown between crown instrument measured data and calculated value. Prediction results are verified after calculation by a large number of work roll profile measured data in the field, and the overall variation trend of rolls integrated crown is consistent with the actual rolls crown under a certain condition. The prediction value of the real-time rolls integrated crown is distributed and applied to each stand mill to avoid complex computer of real-time hot crown and wear crown of single stand mill in hot strip rolling for precise control strip crown. Application results show that the hit rate of the strip crown target value within ±10 μm is improved from 92% to 97% and product quality has been significantly improved. The building model and predicted results offer actual reference value for strip shape theoretical investigation and operation practice in rolling site.

Key words: finite element method, mechanical strip crown, rolling, strip shape, rolls integrated crown