滑块底部去材对滚柱导轨副静刚度的影响分析

Analysis of the Effect of Removing Material at the Bottom of the Carriage on the Static Stiffness of the Rolling Linear Guide

使用有限元方法研究了滑块在底部去材对导轨副静刚度的影响规律和原理。滑块底部去材的目的在于在其内部布置传感器及无线通讯模块,开发智能导轨副。建立了带预紧力的45型滚柱直线导轨副简化模型,使用多根无阻尼弹簧代替滚柱。根据滚柱的形变量与载荷的关系式拟合得到了等效弹簧的刚性系数。为了确保模型的准确性,使用试验数据修正了有限元模型。结果表明,去材深度每增加5 mm,滑块总体刚度分别下降约2.0%、2.4%、2.9%、4.0%,并且导轨副刚度下降的根本原因是去材影响了滑块上表面凹槽下的V型应力区域。

The finite element method is used to study the law and principle of the influence of the material removal at the bottom of the carriage on the static stiffness of the rolling linear guide.The purpose of removing materials at the bottom of the carriage is to install sensors and wireless communication modules in it,thereby developing an intelligent rolling linear guide.A simplified model of 45-type rolling linear guide with preload is established,and multiple undamped springs are used instead of rollers.According to the relationship between the deformation of the roller and the load,the stiffness coefficient value of the equivalent spring is obtained by fitting.In order to ensure the accuracy of the model,the finite element model was revised using experimental data.The results show that the overall stiffness of the slider decreases by about 2.0%,2.4%,2.9%,and 4.0%for every 5 mm increase in the material removal depth.And the fundamental reason for the decrease in the stiffness of the guide rail pair is that the material removal affects the V-shaped stress area located under the groove on the upper surface of the slider.