Numerical Simulation Of Warm Rolling Process In AZ31 Magnesium Alloy Sheet

Magnesium alloys are the lightest metallic structural materials in engineering application by far, its have high specific strength and specific stiffness, good damping capability and thermal conductivity ability, excellent electromagnetic shielding ability, easy cutting and recovery, are known as the "21st century green engineering structural materials". Magnesium alloy sheet especially high performance magnesium alloy sheet has very broad application prospects. As for the quality and production of magnesium alloy sheet made by traditional technology has been unable to meet the needs of modern industry, the warm rolling as a new rolling process is an important direction of current research and development of high-quality magnesium alloy sheet.Traditional experimental method is higher cost and longer cycle, in this paper based on the finite element method, the warm rolling process in magnesium alloy was studied to provide theoretical guidance for the production of high quality magnesium alloy sheet by warm rolling process.Firstly, in order to study the warm rolling process of AZ31 magnesium alloy sheet, based on the existing research and experimental data, the AZ31 magnesium alloy sheet rolling model was established, and the results of worm rolling under two dimensional and three dimensional model were analyzed. Secondly, on the basis of single pass warm rolling, using a small reduction for multi-pass warm rolling simulation, the warm rolling forming rules in small pressure was analyzed. Finally, under different conditions, the simulation of warm rolling was conducted to analysis the effect of process parameters in the rolling process. The main contents and results are as follows:Based on the magnesium alloy rolling forming theory and finite element mechanism,according to the previous research and experimental data, the material properties and finite element calculation conditions in the warm rolling simulation are determined, the ABAQUS software are used to establish the single pass warm rolling model, then, two-dimensional and three-dimensional warm rolling simulation are conducted. The results show that in the plate thickness direction, after rolling the plate temperature field showed obvious ladder, the two-dimensional and three-dimensional simulation results are consistent, but two-dimensional simulations are more clear and less computation time than the three-dimensional simulation.On the basis of single pass warm rolling, the multi-pass warm rolling simulation are conducted. The results show that the temperature field, the stress and strain field distribution are affected by last process, the temperature gradient, equivalent stress and strain gradient are smaller than the single pass rolling.The AZ31 magnesium alloy warm rolling process is simulated under different conditions by two-dimensional model. The results show that: with the reduction decreases, rolling speed increases, rolling temperatures are increased; with the rolling temperature and rolling speed increase, the reduction decreases, the equivalent stress values are reduced; with the reduction decreases, the equivalent strain are decreased; when constant roll speed, with the temperature increases, reduction decreases, rolling force are decreased, When the reduction constant, with the rolling temperature and roll speed increase, the rolling force decreased.