基于Stewart平台的并联机床静刚度分析∗

摘要

Parallel machine tool based stewart platform is systematically described, the degree of freedom parallel machine tool is calculated, a solid model of parallel machine tools is established using UG NX8. 0, in view of the mechanical elastic system of parallel machine tool a finite element model is established using ANSYS14. 0. the hinge of transmission chain is properly simulated. The stiffness distribution in generalized workspace is got by dividing the unit type, appling load ,solving and post-processing, the result provide a reliable theoretical basis for the optimization and structural improvements of parallel machine tool.%对基于Stewart平台的并联机床进行了系统描述，计算了并联机床的自由度，利用UG NX8.0建立了并联机床的实体模型，针对并联机床复杂的机械弹性系统采用ANSYS14.0建立了有限元模型，对传动链中的铰链进行了适当地模拟。通过划分单元类型、施加载荷、求解与后处理得到动平台在广义工作空间下的刚度分布规律，从而为并联机床优化和结构改进提供了可靠的理论依据。