CAJ | 학술논문

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。
위연구주축－축승계통적동태성능，이모형호정밀와식가공중심주축계통위연구대상，통과편심질량격려법측득주축지승축승강도，채용Timoshenko량단원대주축진행유한원건모，계통지분석료주축리심효응、축승예긴력대우주축동태성능적영향，병진행료실험험증。결과표명：제고예긴력가유효증가주축축승강도，제고주축동태성능。동시증명채용유한원법계산주축축승적강도시일충행지유효적방법。
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 ec-centricity mass excitation tests,and the spindle was finite element modeled by using Timoshenko beam elements. The influence of spin-dle 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 Fi-nite Element Method (FEM)is an effective method.