筒形件毛坯热冲压成形过程数值模拟

Numerical Analysis on Hot Stamping of Cylindrical Cup Blank

针对某厚壁深孔筒形件,借助三维有限元模拟软件Deform-3D,对其成形的压型、冲盂和拔伸等3个工步进行模拟,分析得到各工步变形特点。结果表明,压型即将结束时载荷急剧升高,坯料底部转角处和凸台未完全充满,未充满部位在冲盂工步即将结束时得以充满;冲盂时凸模端部以下一部分锥形金属由于受摩擦作用不参与变形,随凸模刚性下移;拔伸过程坯料筒壁受轴向拉应力,润滑不良或变形量大时,筒底容易受拉变形,筒壁容易发生缩颈。

As for the thick-walled cylindrical cup, the forming characteristics of pressing, cupping and shell drawing during the forming process are analyzed by the finite element simulation software Deform-3D. The results show that the load increases sharply at the end of the pressing, while the bottom corner of the billet and the boss are not well formed, which can be finished at the end of cupping. Due to friction, the metal close to the end of the punch does not deform during the cupping process, it rigidly moves with the punch. As the cylinder wall of the billet bears axial tensile stress during the shell drawing, deformation at the bottom and necking at the cylinder wall would occur easily under bad lubrication and large deformation.