Аңдатпа
Asymmetrical rolling is one of the modern methods of stabilizing the microstructure during the rolling process. The implementation of this process ensures an increase in the mechanical properties of rolled products, reduces texture and contributes to obtaining a more uniform microstructure. In this work, the stress state during asymmetrical rolling of thick sheets is studied and the contact pressure is determined by calculation methods. To study the stress state, the slip line method and velocity hodograph were used. Contact pressure was calculated using the slip line method. and joint solution of differential equations of equilibrium and plasticity conditions. It was revealed that in the zone of plastic deformation, compressive stress components prevail, in contrast to the traditional method of rolling in cylindrical rolls, where tensile stresses arise in the axial central zone, which can lead to destruction and elongation of grains in the rolling direction. Analysis of the calculation of contact pressures shows that the relative difference in the values of the specific contact pressures of the metal on the rolls during asymmetric rolling, calculated by the slip line method and the joint solution of differential equilibrium equations and plasticity conditions is insignificant, i.e. does not exceed 6%, which indicates the reliability of the results obtained. During asymmetrical rolling of a strip with a wide deformation zone, due to the occurrence of shear deformations, the neutral height shifts to the exit from the deformation zone, and it is even possible that there is no neutral zone