管材液压成形中的数值模拟方法  

Numerical Simulation Method for Hydroforming of Tube

作　　者：章志兵[1] 李赳华[1] 柳玉起[1] 杜亭[1] 

机构地区：[1]华中科技大学材料成形及模具技术国家重点实验室,武汉430074

出　　处：《中国机械工程》2008年第16期1996-2000,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50575080)

摘　　要：根据动力显式增量有限元方法和BT壳单元提出了液压胀形模拟算法。该算法充分考虑了管材胀形时的液体压力加载曲线、管材外壁与模具的润滑情况、轴向进给、径向进给等实际工艺条件对管材成形性的影响,能够预测零件成形过程中的开裂、起皱等缺陷,从而优化成形工艺参数,提高零件的成形工艺性。算法具有通用性,能够模拟轴线为直线、曲线以及带径向侧冲头的各种复杂管材的成形。将算法集成到FASTAMP软件中,通过模拟三台阶轴的液压胀形,并与实验数据比较,验证了算法的准确性与实用性。An algorithm for tube hydroforming was presented,which was based on the dynamical explicit method and BT element. Many factors which can affect the forming ability of tube were considered,such as the liquid pressure, the lubrication conditions between the tube and the mould,the axial supplements,and the radial supplements in practice. It could help to predict the defect, such as crack, wrinkle and so on, and then optimize the processing parameters. The forming simulation for normal tube and siphon,even with counterpunch on automobiles, navigate and spaceflight field can be dealed with by this algorithm, which was integrated into the software FASTAMP. Finally, the hydroforming process on three--diameter shaft was explores. The precision and the practicability of the algorithm on tube hydroforming were validated by comparison with experimental results.

关 键 词：管材液压成形 动力显式 数值模拟 轴向加载 

分 类 号：TG386.43[金属学及工艺—金属压力加工]