Analysis of the Influence Mechanism of Friction on the Rolling Deformation of SUS304 Foil Based on CPFEM

The friction between the roll and the rolled piece is the main force of plate-strip rolling, and the friction condition of the roll gap seriously affects the surface quality of the plate-strip. Therefore, the friction condition is an important boundary condition in the analysis of plate-strip rolling deformation. The finite element model of SUS304 foil rolling was established by crystal plasticity finite element method, and the accuracy of the rolling model was verified by comparing the measured grain orientation of foil after rolling with the simulation results. Based on the above model, the effects of friction conditions on rolling force, contact pressure and friction stress, slip system motion state and grain orientation of rolled SUS304 foil strip were analyzed. The results show that with the increase of friction coefficient, the length of the forward slip zone increases, the surplus frictional force increases, and the contact pressure and friction stress of the upper and lower rolls in the rolling deformation zone increase slightly. The change of friction coefficient has a great influence on the shear slip of the surface layer of the foil strip, which significantly affects the motion state of the activated slip system at the upper and lower surface positions of the foil strip, significantly improves the shear strain of the activated slip system at the upper and lower surface positions, and increases the dispersion degree of the grains in the upper and lower surface layers around the ND direction.