基于虚拟样机技术的内平动分度凸轮机构动力学分析

Dynamics Analysis of Inner Displaced Indexing Cam Mechanism based on Virtual Prototyping Technology

针对内平动分度凸轮机构的动态特性分析,综合考虑弹性变形、惯性负载等因素,提出了基于刚柔耦合的动力学建模方法。利用SolidWorks、ADAMS及ANSYS软件建立了机构的刚柔耦合动力学仿真模型,分析凸轮–针齿间的接触力、负载及转速对内平动分度凸轮机构动态性能的影响。研究结果表明:在一定工况下,同一分度期内凸轮与单个针齿间的最大接触力出现在输出轴转角20°附近位置;随着负载的增加,机构的振动不断变大;随着转速的增大,输出轴角加速度的幅值明显增大,凸轮–针齿间的接触力也呈现出逐渐增大的趋势;不同转速对内平动分度凸轮机构的动态分度精度有着较大影响。

According to the dynamic characteristics analysis of inner displaced indexing cam mechanism,a dynamic modeling method based on rigid flexible coupling is put forward under the consideration of elastic deformation,inertia load and so on. By using the Solid Works,ADAMS and ANSYS,the rigid flexible coupling dynamics simulation model of Inner displaced indexing cam mechanism is built,the influences of the contact force and the load and rotational speed on dynamic performance of the machine are analyzed. The results of research show that in the same indexing period,the biggest contact force between the cam and single pin appear near the output angle of 20° in certain conditions. With the increase of load,mechanical vibration is increased.And with the increase of rotational speed,the amplitude of the acceleration of the output axis is increased significantly and the contact force between cam and pin is also increased. The different rotational speeds have great influence on the dynamic indexing accuracy of inner displaced indexing cam mechanism.