运用DYNAFORM软件,对轿车侧围激光拼焊板中立柱进行冲压成形有限元数值模拟研究.通过观察成形极限图和厚度分布图对零件进行成形缺陷分析.针对成形结果中出现的拉裂、起皱和减薄等缺陷问题,采用调整成形工艺参数以及设置等效拉深筋的方法改善使成形结果,并根据仿真分析的结果,提出改进及优化工艺的方案.利用数值模拟过程中优化的工艺参数,进行实际零件的拉延成形实验,得到了质量较好的成形零件.研究结果表明:拼焊板焊缝模型的选取、板坯及工具网格的划分直接影响数值模拟的精度;冲压速度、压边力和拉深筋等工艺参数的选取直接影响零件的拉延成形,尤其是通过对拉深筋阻力的调节,平衡了材料的流动,解决了用调节压边力的方法无法解决的拼焊板零件成形问题.%The finite element numerical simulation for the drawing process of laser tailor welded blank car center pillar was researched using software DYNAFORM. By observing the forming limit diagram (FLD) and thickness diagram and analyzing the defects of the forming parts, the forming result were improved by means of adjusting some parameters and setting equivalent draw beads to avoid some defects such as rupture, wrinkling and thinning. Improving and optimizing process was proposed based on the simulation results. Using the optimized parameters used in simulation process, the drawing experiment was carried out, and good quality experimental forming parts were obtained. The results show that selection of weld model and mesh generation of blank and tools can directly affect the simulation accuracy; parameters such as drawing velocity, blank holder force and draw bead can affect the drawing result. Especially, material flow is balanced through regulating draw beads and it solves the problem which can't be solved by adjusting the blartk holder force in laser tailor welded blank forming process.
展开▼
