中文摘要：

采用DEFORM-2D有限元模拟软件研究液体压力、冲头直径以及管坯壁厚的变化对液压冲孔过程的影响，获得冲头推力、冲孔后纵向塌陷尺寸和塌陷区域面积在不同控制参数下的变化趋势，并进行工艺实验验证。结果表明：管内液体压力增加、冲头直径增加、材料壁厚增加都会使冲头推力增大；冲头直径和液体压力对塌陷影响较大，随着冲头直径的增加和内压的降低，塌陷深度尺寸和塌陷区域面积都明显加大，材料壁厚对塌陷尺寸的影响较小。

英文摘要：

A numerical simulation was conducted to investigate the effect of the hydraulic pressure, the punchdiameter and the thickness of tube on the process of hydro-piercing by finite element program DEFORM - 2D, and the variety trend of the punch-force, the roll-width and depth was obtained and verified through experiment. The result shows that the punch-force increases with the increasing of the hydraulic pressure, the punch diameter and the thickness of the tube. The roll-width and the depth of the sheared plane increase with the increasing of the punch di- ameter and the decreasing of the hydraulic pressure, while the influence of the tube thickness is indistinctive.