Numerical Simulation And Experimental Study On Asynchronous Rolling Of Magnesium Alloy Plates

Magnesium alloy has the advantages of light weight,high specific strength,good rigidity and large damping capacity,excellent shock absorption,thermal conductivity and electromagnetic compatibility.It is regarded as the most promising metal material in the 21st century.As the most common magnesium alloy material products,the magnesium alloy sheet was more widely used in the aerospace,automotive,military and 3C fields.However,the current magnesium alloy sheet mainly relies on die-casting forming,the sheet is easy to crack,and the overall performance is poor.The method of altering the internal microstructure of a magnesium alloy sheet to change the quality of the sheet has drawn wide attention.Asynchronous rolling method as the main method to change the internal structure and quality of magnesium alloy sheet has also become a hot issue for its research.Adopting the technique of numerical simulation and experimental research,this paper analyzed the different process parameters on the properties of magnesium alloy sheet one-way asynchronous rolling products.The finite element method and the finite element software ANSYS/LS-DYNA were used in the study to simulate the three-dimensional deformation of asynchronously rolled magnesium alloy sheet.In the process of numerical simulation,the material nonlinearity,geometrical nonlinearity and contact nonlinearity are considered,according to the actual situation,the magnesium alloy sheets and rolls were simplified respectively.At the same time,the necessary assumptions and treatments of the initial conditions,restraints,loads and contact problems were carried out.The changes of stress and strain in the as-rolled magnesium alloy sheet were systematically analyzed.The rolling process of the asynchronously warm-rolled magnesium alloy sheet was completed Numerical simulation analysis.Based on this,taking AZ31B magnesium alloy thin slab as the research object,the experimental research of unidirectional rolling under different rolling conditions was carried out.The internal structure was observed by metallographic microscope.The tensile test machine and micro Vickers Hardness tester and other experimental methods,the physical properties of the test.Finally,the experimental research on the internal microstructure and physical properties of magnesium alloy sheet under different conditions of asynchronous rolling has been completed.In this paper,finite element software ANSYS/LS-DYNA was also used to simulate the three-dimensional deformation of the Mg/Al asynchronous composite rolling process.The influence factors of rolling were arranged by orthogonal test.The changes of stress and strain in the process of Mg/Al asynchronously composite rolling and the coordination of the two kinds of metal deformation were systematically analyzed,and the Mg/Al asynchronous composite rolling Research on Numerical Simulation of Process.Afterwards,the compound experiment was carried out according to the most complex conditions obtained by numerical simulation.The research results of this project have some reference value for the study of the performance of the microplate structure of the asynchronous temperature rolling magnesium alloy,the stress strain analysis,the design of the plate type and the development of the product of the temperature rolling magnesium alloy sheet.