Roll Deformation Model of Four High Hot Rolling Mills Based on Improved Influence Function Method

ABSTRACT

Roll deformation is an important part of profile and flatness control system. Computation speed and accuracy of roll deformation model is a research hotspot, which provides a precondition for online application. This paper puts forward a new roll deformation model of four high hot rolling mills based on improved influence function method. In the new model, the roll bending calculation uses elastic beam method based on the mechanics of materials theory, which avoids complex algorithms for solving influence coefficient matrix. The relationship between roll flattening and rolling force is fitted by quartic polynomial, which avoids complex iteration algorithm because of their nonlinear relationship. In iteration process of deformation coordination equation, element flattening difference and center flattening correction model are developed, which avoids calculation efficiency problem due to double iterative in the influence function method. By comparison with the finite element method and influence function method, the new model has faster calculation speed and higher precision, which satisfies the online application requirement, and provides the guarantee for high precision quality control.

Keywords:

Influence function method, Profile and flatness control, Roll bending, Roll deformation, Roll flattening.