滚动直线导轨热变形对接触刚度的影响

以HSR15A滚动直线导轨为研究对象，基于赫兹接触理论，分析了滚动直线导轨在考虑预载和热变形情况下的弹性受力变形，建立了滚动直线导轨结合面变形的几何关系，从而推导出结合面热变形对接触刚度影响的理论模型.通过有限元软件仿真分析了滚动直线导轨在不同垂直载荷下的温度分布，以及热变形对滚动直线导轨刚度的影响规律.分析结果表明:随着垂直载荷的增大，滚动直线导轨上滚道刚度逐渐增大，下滚道刚度逐渐减小，等效刚度也逐渐减小;热变形可以使滚动直线导轨刚度减小，且随着载荷的增加热变形对刚度的影响越来越显著.

Influence of Thermal Deformation of Rolling Linear Guide on Contact Stiffness

Taking an HSR15A rolling linear guide as a research object， its elastic deformation under the conditions of pre-loading and thermal deformation is analyzed on the basis of Hertz contact theory. The geometric relationship of the deformation of the rolling linear guide’s joint surfaces is established， and the theoretical model for the influence of thermal deformation of joint surfaces on contact stiffness is derived. The temperature distribution of the rolling linear guide under different vertical loads and the influence of thermal deformation on the guides’s stiffness are analyzed by using the finite element software. The results show that with the increase of vertical load， the stiffness of the upper raceway increases gradually， while the stiffness of the lower raceway decreases and the equivalent stiffness decreases also; the stiffness of the rolling linear guide can be reduced by thermal deformation， and the influence of the thermal deformation on the stiffness becomes more and more significant with the increase of vertical load.