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针对油箱底壳零件在冲压成形过程中产生的起皱、破裂、成形不充分等缺陷,利用Dynaform软件对油箱底壳冲压过程进行数值模拟,分析拉延筋的设置对油箱底壳成形质量的影响。模拟结果表明,可以利用等效拉延筋确定其合理的工艺参数,采用分段拉延筋比采用均布拉延筋更符合零件的拉深成形要求;模拟优化后的分段半圆截面拉延筋高度和半径分别为筋一、筋三H=2 mm,R=3 mm,筋二、筋四H=5 mm,R=3 mm;确定了真实拉延筋模拟更能反应零件的成形状态。之后采用真实分段拉延筋进行拉深成形试模。结果表明,工件成形效果良好,修边区域内无褶皱、破裂等成形缺陷,零件最大减薄率为20.3%。
Aiming at the flaws such as wrinkling, rupturing and insufficient forming during the stamping process of the oil tank bottom shell parts, the stamping process of the tank bottom shell was simulated by Dynaform software, and the influence of the setting of drawbead on the forming quality of the oil tank shell was analyzed . The simulation results show that the equivalent drawbead can be used to determine the reasonable process parameters, and the drawbead using segmented drawbead is more in line with the draw forming requirements than the drawbead with uniform drawbead. The simulated and optimized sectioned semicircular drawbead The height and radius of the tendon were respectively HR = 2 mm, R = 3 mm, Rib II, Rib IV H = 5 mm, R = 3 mm. It was confirmed that the true drawbead simulation could better reflect the forming state of the part . After the use of the actual section drawbeam drawing test. The results show that the work piece forming effect is good, and there is no forming defect such as wrinkle and rupture in the trimming area. The maximum reduction rate of the part is 20.3%.