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径向压力辅助水力深拉是一项先进的板材成形技术,具有拉伸比高,表面质量好和尺寸精度高等优点。在拉伸过程中,底面和外边都受到水力的压力,因此变形均匀,失效可能性减小。与传统变形工艺相比,水力深拉技术更容易成形复杂形状的多层板材。破裂是板材成形过程中主要的不可逆的失效形式,破裂预测对确定和优化合适工艺参数具有重要作用。采用理论模型计算了径向压力辅助水力深拉成形双层锥形杯的临界破裂压力。讨论了其他参数如冲头半径、拉伸比、摩擦因数、板材厚度和材料性能等对临界破裂压力的影响。将所建模型与有限元模拟进行比较,并在Al1050/St13双层板材上进行试验验证,结果表明,试验结果与分析结果一致。
Radial pressure assisted hydraulic deep drawing is an advanced sheet forming technology with the advantages of high draw ratio, good surface quality and high dimensional accuracy. During the drawing process, both the bottom and the outside are subjected to hydraulic pressure so that the deformation is uniform and the probability of failure is reduced. Compared with the traditional deformation process, hydraulic deep drawing technology is easier to shape complex shapes of multi-layer sheet. Rupture is the main form of irreversible failure during sheet forming. Fracture prediction plays an important role in determining and optimizing suitable process parameters. A theoretical model was used to calculate the critical fracture pressure of double-layer conical cup supported by radial pressure-assisted deep hydraulic drawing. The effects of other parameters such as punch radius, draw ratio, friction factor, sheet thickness and material properties on the critical fracture pressure were discussed. The model was compared with the finite element simulation and verified on the Al1050 / St13 double-layer plate. The results show that the experimental results are consistent with the analysis results.