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为考虑压力机柔性体部件对机械运动的影响,以八连杆压力机的传动机构为研究对象,使用Pro/E软件对八连杆传动机构进行参数化实体建模,分别应用ANSYS Workbench软件中的Rigid Dynamic模块及Transient Structural模块,在对八连杆压力机的传动机构做刚体运动学仿真的基础上,进行该传动机构的刚柔耦合动力学分析,得到压力机传动机构的运动特性曲线和等效应力曲线及分布图。结果显示,主拉杆最大等效应力高于材料许用应力,将下轴孔尺寸优化为69 mm后,最大等效应力大大降低,符合主拉杆强度要求。这种方法实现了在同一软件平台中进行刚体运动学和刚柔耦合动力学仿真分析,通过两者比较可得出,刚柔耦合模型更能反映出机构的真实运动情况。
In order to consider the influence of the flexible part of the press on the mechanical motion, the transmission mechanism of the eight-bar press is taken as the research object. The parametric solid modeling of the eight-bar transmission mechanism is carried out by using the Pro / E software. The software of ANSYS Workbench Rigid Dynamic module and Transient Structural module. Based on the rigid body kinematics simulation of the transmission mechanism of the eight-bar linkage press, the rigid-flexible coupling dynamics analysis of the transmission mechanism was carried out. The kinematic curves of the transmission mechanism were obtained. Equivalent stress curves and distributions. The results show that the maximum equivalent stress of the main tie rod is higher than the allowable stress of the material. When the size of the lower bore is optimized to 69 mm, the maximum equivalent stress is greatly reduced, which meets the requirements of the main tie rod strength. This method realizes the rigid body dynamics and the rigid-flexible coupling dynamics simulation analysis in the same software platform. By comparing the two, it can be concluded that the rigid-flexible coupling model can better reflect the real motion of the mechanism.