多钳式拉形是一种新型的板材柔性拉形工艺。采用有限元软件建立了球形件拉形的有限元模型,探讨了不同工艺方式和工艺参数对工件拉形质量的影响。结果表明:多钳式拉形有助于板材贴模,拉形件的应变分布均匀,可以提高拉形质量。板材与模具之间的摩擦系数越小,板厚减薄量越小;缩短过渡区,可以避免起皱缺陷,提高材料利用率。通过实验验证了数值模拟结果,模拟结果对多钳式拉形设备的优化设计以及实际板材的塑性加工具有指导价值。 Multi-grip pull is a new type of sheet flexible drawing process. The finite element software was used to establish the finite element model of spheroidal drawing. The effects of different technological methods and process parameters on the quality of the workpiece were discussed. The results showed that the multi-nip pull-shape was helpful for the plate-sticking and the strain distribution of the pull-shaped pieces was even and the quality of the drawing could be improved. The smaller the friction coefficient between the plate and the mold, the smaller the amount of thickness reduction; shortening the transition zone, to avoid wrinkling defects and improve material utilization. The results of numerical simulation are validated by experiments. The simulation results have guiding value for the optimization design of multi-gripper drawing equipment and the plastic working of the actual plate.