Numerical Simulation Of Rolling Process And Prediction Model Of Rolling Force For Magnesium Alloy Sheet

Magnesium alloy is used in many industry for its advantages such as low density, high specific strength and stiffness, good electromagnetic shielding. With the advantages of high production efficiency and easy to realize automated production, rolling has become an important means of deep processing of magnesium alloy. As one of the most important basic models, the rolling force prediction model is an important theoretical basis for the control of plate thickness. However, it is still short of the rolling force prediction model which is suitable for hot rolling production of magnesium alloy. The rolling production of magnesium alloy sheet is greatly restricted. In this paper, the AZ31 B magnesium alloy is used as the research object.The flow stress, deformation resistance and residual strain rate of AZ31 B magnesium alloy were studied by single / double pass isothermal compression experiment, and the prediction model of hot rolling force of AZ31 B magnesium alloy was established. It provides an important theoretical support for hot rolling production of magnesium alloy.The single pass high temperature compression experiment of AZ31 B magnesium alloy was carried out by thermal simulation test machine. Simplify Arrhenius equation and then solve the related material parameters, finaly the mathematical model of AZ31 B magnesium alloy flow stress and dynamic recrystallization grain size mode is established. Based on the single pass compression stress-strain data, the deformation resistance model of AZ31 B magnesium alloy was solved by using Zhou Jihua deformation resistance model. After analysis, the model error and the strain of the model are two polynomial relations, which is proposed to improve the deformation resistance of the magnesium alloy model. After verification, the improved model has higher prediction accuracy. The effects of deformation temperature, deformation rate and interval time on the softening rate of AZ31 B magnesium alloy were studied. The calculation model of the AZ31 B magnesium alloy was established, which was the second time of the softening rate and the residual strain rate. Based on rolling theory and rolling force sub model, the prediction model of hot rolling force for AZ31 B magnesium alloy was established. Finally, the numerical simulation of magnesium plate rolling process and the actual hot rolling experiment was carried out. The simulation results were in good agreement with the experimental results, which proved the accuracy of the model.