基于试验和有限元方法的橡皮囊液压成形回弹规律

橡皮囊液压成形中常见的缺陷包括破裂、起皱和回弹等成形缺陷,其中回弹缺陷直接影响钣金件的尺寸精度。文章针对带下陷直弯边和凸弯边钣金件进行橡皮囊液压成形试验。结果表明,随着压力的增加,回弹值减小;弯曲线取向为90°的回弹值,大于弯曲线取向为0°的回弹值;弯曲成形性能与轧制方向的选取有关。有限元模拟结果与试验结果进行对比分析表明,模拟所得回弹值与试验结果相比偏小。

Study on springback law in rubber fluid forming by experiment and FEM

Many forming defects exist in rubber fluid forming,such as rupture、wrinkling and springback.The springback defect directly affects the size precision of the sheet metal.Rubber forming experiments and finite element simulations had been carried on for the straight flanging sheet metal with joggle and the shrink flanging sheet metal with joggle.The results show that for both kinds of flanging parts,springback decrease with the increase of pressure,springback at bending orientation 90° are more than that at bending orientation 0° and the bending formability is related to the rolling direction.The comparison between the experimental and the simulation results shows that the springback value of the simulation results are a little lesser thanthat of the experimental results.