基于ANSYS Workbench的八连杆压力机刚柔耦合模型动力学分析

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。

Rigid-flexible coupling dynamics analysis of eight-links mechanical press based on ANSYS Workbench

Considering the influence of the flexible body part of press on mechanical motion, for the transmission mechanism of the eight-links mechanical press, its parametric entity modeling was established by Pro/E software. Then, based on the rigid body kinematic simulation of the transmission mechanism of eight-links mechanical press, a rigid-flexible coupling dynamics analysis of the transmission mechanism was carried out by Rigid Dynamic module and Transient Structural module in ANSYS Workbench software, and the motion characteristic curves of the press transmission mechanism and the equivalent stress curve and distribution were obtained. The results show that the maximum equivalent stress of main link is higher than the material allowable stress, after optimization of the lower shaft hole size to 69 mm, the maximum equivalent stress is significantly reduced to fit for the main link strength requirements. Therefore, the rigid body kinematics and rigid-flexible coupling dynamics simulation analysis can be realized in the same software platform, and the rigid-flexible coupling model can better reflect the true movement of mechanism by comparing two models.