Study on the Shape Target Curve Setting Model for Cold Rolling Strip

Abstract

In order to automatically set the shape target curve, a model based on shape control theory is put forward. By coupling the shape forecast model and the shape discrimination model, the practical and strict shape target curve is researched. By combining strip plastic deformation model and rolls elastic deformation model, the shape forecast model is built. The shape discrimination is based on the strip element method. The main idea of the shape target curve is to minimize the shape crown in the first few passes on the condition that the strip is not unstable, in the last two passes to keep the good shape under the natural shape crown. Taking five-pass six-high rolling mill as an example, the convex strip is analyzed. The simulation and calculation results prove the validity and feasible of the shape target curve setting model. This model develops the shape target theory and lays the foundation of application of shape target curve in the rolling process of cold rolling.

Study on setting method of flatness target curve of SUNDWIG 20-high mill considering target crown

“…In the literature [13], only the rolling mill and the flatness are considered, specifically, the roll system elastic deformation, the metal plastic deformation model and the instability discrimination model are combined together, and the discriminant factor can be optimized to meet the preset requirements by the flatness control means. After reaching the limit of the mill flatness control ability, if the discriminant factor is still not available in the convergence range, it proves that the target flatness has exceeded the range of the mill flatness control ability, then the discriminant factor needs to be reset.…”

“…Chen [12] proposed the method of dynamically setting the flatness target curve, which improved the product quality, considering the rolling force and rolling speed fluctuation and plate parameters in the rolling process. Zhao [13] proposed to combine the flatness control ability of the rolling mill with the flatness target curve theory. and in the formulation process, factors such as the installation error compensation of the the detection roll and the transverse temperature were considered.…”