摘要
采用有限元数值模拟的方法研究镁合金壁板的无填充式压弯工艺与刚性填充式压弯工艺,比较不同压下量(6、9、12 mm)下壁板的等效应力、应变场分布规律及曲率半径的变化特性。研究表明:刚性填充式压弯工艺通过凸模刚性填充块的连续载荷传递与三维约束效应,可显著提升等效应力及应变分布的均匀性,其中等效应力差值由无填充式压弯工艺的46 MPa降至16 MPa,应变差值由0.042降至0.008,均匀性系数分别提高了65.22%和80.95%。数值模拟与实验结果表明:压下量增加时,壁板的等效应力与等效应变呈非线性增长;曲率半径模拟值与理论值的最大误差仅为2.602%,控制在3%以内;采用刚性填充式压弯成形方法获得的镁合金壁板部件质量良好,壁板成形区域过渡平滑,型面贴合度较好,未出现微裂纹、起皱等成形缺陷。
A finite element numerical simulation method was employed to study the filler-free press bending process and the rigid-filler press bending process for magnesium alloy panels.The distributions of equivalent stress and strain fields,as well as the variation characteristics of curvature radius,were compared under different press reductions(6,9,12 mm).The study indicates that the rigidfiller press bending process significantly enhances the uniformity of equivalent stress and strain distributions through the continuous load transfer and three-dimensional constraint effect of the rigid filler block in the punch.Specifically,the equivalent stress difference decreased from 46 MPa in the filler-free process to 16 MPa,and the strain difference decreased from 0.042 to 0.008.The improvement in uniformity reached 65.22%and 80.95%,respectively.Numerical simulations and experimental results show that as the press reduction increases,the equivalent stress and equivalent strain of the panel exhibit nonlinear growth.The maximum error between the simulated curvature radius and the theoretical value is only 2.602%,controlled within 3%.Magnesium alloy panel components produced using the rigid-filler press bending method exhibit good quality,with smooth transitions in the formed regions,favorable profile conformity,and an absence of forming defects such as micro-cracks or wrinkling.
作者
辛雨骐
柳泉
王茂余
王忠堂
李艳娟
梁海成
XIN Yuqi;LIU Quan;WANG Maoyu;WANG Zhongtang;LI Yanjuan;LIANG Haicheng(Shenyang Ligong University,Shenyang 110159,China;Jilin 3305 Machinery Factory,Dunhua 133709,China)
出处
《沈阳理工大学学报》
2026年第3期62-67,74,共7页
Journal of Shenyang Ligong University
基金
辽宁省应用基础研究计划项目(2023JH2/101300214)
辽宁省教育厅高等学校基本科研项目(JYTMS20230191)
沈阳理工大学“光选计划”人才资助项目(SYLUGXRC14)和科研团队资助项目(SYLUGXTD5)。
关键词
镁合金
壁板
刚性填充
压弯成形
数值模拟
magnesium alloy
panel
rigid filling
press-bending forming
numerical simulation
