双丝杠与直线导轨结合部静刚度分析

摘要

基于弹性力学赫兹接触理论,对主轴箱在z轴不同位置时双滚珠丝杠副轴向刚度、角接触球轴承轴向刚度和直线导轨副线刚度进行分析,建立了静刚度模型.基于此模型,结合有限元仿真,得出永磁直线同步电动机法向力对机床刀具点的变形.仿真结果与实验结果对比表明,两者吻合很好,验证了静刚度模型的有效性.%Based on the Hertz contact theory of elastic mechanics, a static stiffness model of double ball screw's joint was built by analyzing the linear stiffness of double linear guide rails and the axial stiffness of double ball screw and ball bearing. The permanent magnet linear synchronous motor' s normal force affected the deformation of the feeding system. Based on the static stiffness model, deformation of the tool point was analyzed by finite element method and compared with the experimental results, The simulation results were in good agreement with measured data and indicated the accuracy of the static stiffness model.