摘要
机床主轴系统动态特性直接影响铣削稳定和表面加工质量,而铣削状态下主轴系统动态特性与静止或空转状态下存在差异.针对此问题,建立了铣削工况下主轴系统和结合面动力学耦合模型,获得铣削工况下主轴系统动态特性,并通过铣削过程中机床主轴系统动态特性实验测试进行验证,将静止状态与铣削工况进行对比,预测结果误差平均降低了11.35%.实验结果表明,径向铣削载荷和转速削弱了结合面的刚度特征和系统动态特性,而轴向铣削载荷增强了结合面的刚度特征和系统动态特性,影响最为明显的是主轴转速,其次为径向铣削载荷,然后为轴向铣削载荷.研究结果为铣削状态下主轴系统动态特性和铣削稳定性预测提供了理论支持.
Abstract
The dynamic characteristics of the machine tool spindle system directly affect the milling stability and surface machining quality,while they are different between static or idle state n milling.The dynamic coupling model of the spindle system and the joint surface under the milling condition is established in this paper,and then the dynamic characteristics of the spindle system under the milling condition is obtained.It is verified by the experimental test of dynamic characteristics of machine tool spindle system during milling.Compared with the static state,the error of prediction results under milling conditions are reduced by 11.35%on average.It is con-cluded that radial milling load and rotational speed reduces the stiffness characteristics and system dynamic char-acteristics of the joint surface,while axial milling load enhances the stiffness characteristics and system dynamic characteristics.The most obvious influence is determined by the spindle rotational speed,followed by radial mill-ing load and then axial milling load.The results provide theoretical support for the prediction of dynamic charac-teristics and milling stability of spindle system under different milling conditions.
NETL
NSTL
维普
万方数据