基于翻孔试验的AZ31B镁合金薄板温成形特点研究  

Research on warm forming characteristics of AZ31B magnesium alloy sheet based on hole-flanging test

作　　者：胡威 薛松[1] 何其其 高洪晨 邓瑞 许明龙 何绍祥 李泽农 HU Wei;XUE Song;HE Qi-qi;GAO Hong-chen;DENG Rui;XU Ming-long;HE Shao-xiang;LI Ze-nong(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010

出　　处：《塑性工程学报》2024年第5期37-47,共11页Journal of Plasticity Engineering

摘　　要：以1.6 mm厚的AZ31B镁合金板料为研究对象,利用Deform-3D软件探究了温成形翻孔工艺的成形特点,分析了成形温度、冲压速度和压边间隙对制件成形过程中等效应力、成形载荷及厚度变化的影响规律和机理,在此分析结果基础上提出了翻孔优化工艺,并通过对比优化工艺下仿真试验和物理试验中制件的变形情况,验证了模拟仿真的正确性。结果表明,扩孔阶段制件凸缘区材料应力波动幅度最大,达到141.29 MPa,减薄和增厚最严重的区域分别是伸长区底部和凸缘区,分别达到20.00%和3.13%,温度与材料的等效应力峰值及应力分布不均匀性呈负相关,较低的冲压速度可以给材料变形提供充足的缓冲时间,有利于降低等效应力峰值和增厚率,压边间隙主要影响材料厚度变化情况而对材料主变形区等效应力的影响较小,仿真试验与物理试验制件的终态材料厚度分布趋势一致,凸模峰值载荷误差为0.94 kN,仿真试验结果与物理试验结果具有良好的一致性。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 temperature,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,reaching 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.

关 键 词：AZ31B镁合金 温成形 翻孔 成形特点 

分 类 号：TG386[金属学及工艺—金属压力加工]