基于ANSYS的国产数控机床高速电主轴的仿真分析

Investigation of Static and Dynamic Characteristics of a High-speed Electric Spindle Based on ANSYS

为了研究国产数控机床高速电主轴的静、动态性能,通过ANSYS分析软件建立了电主轴的简化有限元模型,对电主轴的静、动态特性参数进行了数值仿真分析;并采用实验模态测试技术验证了有限元模型的有效性和准确性;在此基础上,分析了电主轴支撑跨距对电主轴动态性能的影响规律,确定了电主轴跨距的最优范围.结果表明,有限元仿真与实验模态测试结合,能有效分析电主轴的动态性能,并实现结构的优化.

To investigate the static and dynamic performance of high-speed electric spindle, the finite element analysis method based on ANSYS was applied to determine static stiffness, natural frequencies and modal shapes of the spindle. By comparative analysis between the finite analysis and the modal experimental results, the error of the spindle＇s natural frequencies is very small and the modal shapes are basically identical. That shows that the boundary conditions and parameters＇ set are reasonable, and the results have practical value. By employing this finite element modal, the influence of the spindle span on the dynamics of the spindle was studied and the optimal range of the spindle span was determined. Results show that combining finite element analysis with modal experiment, the dynamic performance can be analyzed effectively and the structure optimization can be realized.