型材2D拉弯数值模拟建模技术研究

型材拉弯成形有限元模拟关键在于型材夹持端运动轨迹的合理描述。对于由力控制的拉弯成形方式, 夹钳运动轨迹很难直接给出。本文探讨了拉伸作动筒的建模技术, 给出了型材2D拉弯数值模拟载荷边界条件的确定方法。应用动力显式有限元软件Pam -Stamp2000对挤压铝合金矩形管拉弯成形过程进行了数值模拟, 模拟结果和实验结果相当吻合, 证实本文提出的拉弯成形数值模拟建模技术是有效的、可靠的。

Study on numerical modeling for simulation of 2D stretch bending of extrusions

The key to numerical simulation of stretch bending of extrusions is determination of loading path of the clamped ends of extrusion. However, it is difficult to directly describe the movement of jaws for force-controlled stretch bending. In the paper, the modeling of hydraulic actuator is put forward and the loading boundary conditions of the clamped end of extrusion in numerical simulation of 2D stretch bending is discussed. Numerical simulation of stretch bending of an extruded aluminum tube with rectangular cross section is carried out, and simulation results are compared with experimental observations in literature, finding that predictions from simulation are in good agreement with experiments. It is proved that the modeling technique put forward for force-controlled 2D stretch bending of extrusions is reliable and effective, which lays a foundation for further numerical analysis of stretch bending process for extrusions.