主轴单元参数化建模、分析与优化设计

为实现主轴单元静动态特性的快捷分析,本文提出了主轴单元有限元建模基本参数的概念,建立了主轴单元通用有限元简化模型。以某厂新型五面体加工中心主轴单元为研究对象,利用简化模型得到了主轴单元的静刚度和前十阶模态。与简化前的分析结果比较,证明了简化模型的正确性。分析了不同轴承预紧工况下前两阶固有频率的变化,通过对主轴单元进行动态优化设计,使一阶固有频率提高了32.2%,主轴重量减少了42.9%。

Modeling and Optimal Design of Parameters of a Spindle Unit

To analyze quickly the static and dynamic properties of a spindle unit,we propose the basic parameters for spindle unit FE(finite element) modeling and establish the general-purpose simplified FE model of the spindle unit.We use the simplified model and study the spindle unit of a new-type machining center of a certain factory,thus obtaining its still stiffness and first ten order modes.Compared with the unsimplified model,the simplified model is proved to be correct.We also analyze the changes in the first two-order natural frequencies under the conditions of different bearing preloads.The dynamic and optimal design of the spindle unit increases its natural frequency by 32.2% and reduces its weight by 42.9%.