Numerical Simulation And Optimization Of AZ31 Magnesium Alloy Sheet Rolling Process

The rolled AZ31 magnesium alloy sheet is one of the widely used deformed magnesium alloy products.The magnesium alloy has the characteristics of low density,high strength,easy heat dissipation,and good shock absorption.It has been widely used in transportation,aerospace,3C electronics and other fields.Nevertheless,there are still some limitations in the manufacture of magnesium alloy sheets.The magnesium alloy sheet has poor plasticity at room temperature,and plastic forming processing is difficult.The rolling of magnesium alloy sheet needs to be performed at a certain temperature,which results in the complex warm rolling process of magnesium alloy sheet,the warm rolling process is not mature enough,product quality and scale difficult to meet the requirements.Therefore,studying the rolling process of magnesium alloy sheet has an important role in promoting the improvement of the production quality and expanding the production scale of magnesium alloy sheet.(1)A single-pass rolling model of magnesium alloy sheet was established by ABAQUS finite element simulation software.The model is applied to the rolling process of AZ31 magnesium alloy sheet to simulate the rolling process under different process.The simulation results in this paper are compared with the literature research results,which verifies the accuracy of the model.Design-expert response surface analysis software was used to analyze the single-pass rolling process of AZ31 magnesium alloy,and the multiple effects of process parameters on the rolling process were studied.(1)The single pass rolling model of magnesium alloy sheet was established by ABAQUS finite element simulation software.The model was applied to the rolling process of AZ31 magnesium alloy sheet,and the rolling process was simulated under different technological parameters.The single-pass sheet rolling process of AZ31 magnesium alloy was analyzed by design-expert response surface analysis software,and the effects of technological parameters on the rolling of magnesium alloy sheet were studied.The single-pass sheet rolling process of AZ31 magnesium alloy was analyzed by design-expert response surface analysis software,and the effects of technological parameters on the rolling of magnesium alloy sheet were studied.(2)Establish a two-pass rolling model of AZ31 magnesium alloy sheet,and use Design-expert response surface analysis software to design a two-pass rolling simulation scheme.According to the rolling simulation scheme,the two-pass rolling process of AZ31 magnesium alloy sheet was simulated.The influence of the selection of the first pass process parameters onthe second pass rolling process in the double pass rolling process was analyzed.The results show that the changes of process parameters in the first pass have significant effects on the peak stress,plate temperature and average rolling force of the second pass rolling process.The optimization method was used to optimize the two-pass rolling process of magnesium alloy sheet,and the optimal rolling process parameters were obtained.(3)Rolling experiments were carried out according to the optimized process parameters to prepare AZ31 magnesium alloy sheet.Observation and analysis of the rolled plate by unidirectional tensile test,metallographic test and scanning electron microscope.The results show that the yield strength of the AZ31 magnesium alloy sheet prepared by the optimized rolling process is 326 Mpa,the tensile strength is 368 Mpa,the elongation is 10.2%,the average grain size is 7.6?m,and the fracture morphology of the tensile sample is obvious dimple fracture.The comprehensive mechanical properties of the AZ31 magnesium alloy sheet obtained by rolling are good.Fully validated finite element simulation has some significance to the actual rolling process optimization.