高速机床主轴－轴承系统动态性能研究

为研究主轴－轴承系统的动态性能，以某型号精密卧式加工中心主轴系统为研究对象，通过偏心质量激励法测得主轴支承轴承刚度，采用Timoshenko梁单元对主轴进行有限元建模，系统地分析了主轴离心效应、轴承预紧力对于主轴动态性能的影响，并进行了实验验证。结果表明：提高预紧力可有效增加主轴轴承刚度，提高主轴动态性能。同时证明采用有限元法计算主轴轴承的刚度是一种行之有效的方法。

Research on Dynamic Performance of Spindle-Bearing System of High Speed Machine Tool

In order to research the dynamic characteristics of spindle-bearing system, the spindle system of one type of precision horizontal machining center is taken as the object. The stiffness of the bearings for spindle support was set to the values measured in eccentricity mass excitation tests, and the spindle was finite element modeled by using Timoshenko beam elements. The influence of spindle centrifugal effect and bearing preload on the dynamic performance of the spindle-bearing system were analyzed systematically, and were verified by tests. The results show that increasing the preload can effectively improve the stiffness of the spindle bearings as well as the dynamic performance of the spindle. At the same time, it is proved that to calculate the stiffness of spindle bearings by using Finite Element Method (FEM) is an effective method.