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管轴压成形省力、高效,但极易发生失稳起皱。通过试验与正交数值模拟相结合,对AA6061铝合金管在锥形模上的轴压失稳起皱进行了研究。在建模过程中建立了AA6061铝合金管材的本构关系,解决了建模过程中的动态加载、求解控制等关键问题,建立并验证了管轴压失稳起皱的有限元模型。通过有限元模拟与试验相结合,分析了模具半锥角对管轴压失稳起皱过程的影响。结果发现,模具半锥角对管轴压失稳过程中的变形方式及位置、管壁应力状态、临界失稳力等均产生重要影响。
Pipe shaft pressure forming labor-saving, high efficiency, but prone to instability wrinkling. Through the combination of experimental and orthogonal numerical simulation, the instability and wrinkling of AA6061 aluminum alloy tube on conical die were studied. During the process of modeling, the constitutive relation of AA6061 aluminum alloy pipe was established, the key problems such as dynamic loading and solution control in the process of modeling were solved, and the finite element model of pipe instability and wrinkling of pipe was established and verified. Through the combination of finite element simulation and experiment, the influence of mold half cone angle on tube lube instability and wrinkling process was analyzed. The results show that the half cone angle of die plays an important role in the deformation mode and position, the stress state of the pipe wall, the critical buckling force and so on.