Research on warm forming characteristics of AZ31B magnesium alloy sheet based on hole-flanging test
Taking AZ31B magnesium alloy sheet metal with thickness of 1.6 mm as the research object,the forming characteristics of warm forming hole-flanging process were explored using Deform-3D software,and the influence laws and mechanisms of forming tempera-ture,stamping speed and blank holder gap on the equivalent stress,forming load and thickness variation during the forming process of workpiece were analyzed.Based on the analysis results,the hole-flanging optimization process was proposed,and the correctness of the simulation was verified by comparing the deformation of workpieces of the simulation and physical tests under the optimized process.The results show that the stress fluctuation amplitude of the material in the flange area of the workpiece during the reaming stage is the highest,reaching 141.29 MPa,and the most severe thinning and thickening areas are the bottom of the elongation area and the flange area,reac-hing 20.00%and 3.13%,respectively.The temperature is negatively related to the equivalent stress peak value of the material and the non-uniformity of the stress distribution.Lower stamping speed can provide sufficient buffer time for the material deformation,which is conducive to reducing the equivalent stress peak value and thickening rate.The blank holder gap mainly affects the variation of material thickness,but has little effect on the equivalent stress in the main deformation area of the material.The thickness distribution trend of the final material of the simulation test is consistent with that of the physical test workpiece,and the peak load error of the punch is 0.94 kN,the simulation test results are in good agreement with the physical test results.
万方数据
维普
