变径管液压胀形与折叠有限元分析及加载路径的优化

Research on Finite Element and Loading Paths Optimization of Hydraulic Bulging and Folding on Variable-diameter Tube

针对现有的变径管制造技术,文章提出了液压胀形与折叠工艺,实现在一副模具同时完成液压胀形与折叠,并且采用了ABAQUS有限元模拟确定了成形过程参数、几何参数。分析了液压胀形与折叠过程中液压力和两端进给量这两个关键参数的优化组合以及不同的加载曲线对其成形的影响。结果表明,采用液压胀形与折叠工艺成形的零件壁厚更加均匀。用初始阶段内压力和轴向推力同时较大的加载路径方式所获得的零件成形性能优良。当内压组合在30、70、20 Mpa的情况下,变径管的壁厚得到优化。

Aiming at the existing manufacturing technology of variable-diameter tube, the paper presents hydraulic bul ging and folding technology to achieve the accomplishment of a pair of die hydraulic bulging and folding simultaneously. By ABAQUS finite element simulation and identifies the forming process parameters and geometry parameters. The paper analyzes the optimal combination of the two key parameters of the liquid pressure and ends of the feed during the hydraulic buling and folding, besides effect of different loading curve on the forming process. The result shows that wall thickness of component using hydraulic bulging and folding is more even. When the superior loading path uses internal pressure and axial thrust in the initial stage, the forming performance of the parts is excellent. When the internal pressure combination falls into 30,70, 20 Mpa, thickness of forming parts reaches its optimization.