Friction Model for Strip Rolling

To improve the accuracy and speed of finite element calculation, a new friction model was proposed, in which a layer of thin friction element between the roller and workpiece was introduced to consider the contact friction. This model was used in the three-dimensional elastic-plastic finite element model of strip rolling process. Taking the geometrical size and physical characteristics of intermediate medium between roller and workpiece into consideration, the stiffness of the friction element was corrected by two factors, i.e., the thickness of friction element and beta factor. Without any assumption about the value and direction of friction force and neutral point position, the rolling process was simulated by using this model. The results obtained by this model were compared with the experimental results and the feasibility of the model was verified.