计入刚度影响效应的滚动直线导轨几何参数对润滑性能的影响  

Influence of Geometric Parameters on Lubrication Performance of Rolling Linear Guides Considering Stiffness Effects

作　　者：李栋 刘晓玲 李磊 郭光福 LI Dong;LIU Xiaoling;LI Lei;GUO Guangfu(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520)

机构地区：[1]青岛理工大学机械与汽车工程学院,青岛266520

出　　处：《机械工程学报》2021年第7期100-108,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51475250)。

摘　　要：为保证滚动直线导轨的精度和振动稳定性,在装配时通常对导轨副施加预紧载荷。为研究预紧条件下滚动直线导轨的刚度对其润滑性能的影响,基于LG-45型导轨建立了刚度模型和考虑预紧的润滑分析模型。分析了滚珠直径、沟槽曲率比和滑块速度对钢-钢和钢-Si_(3)N_(4)两种接触副系统弹性预紧量的影响,并讨论了刚度对导轨副润滑性能的影响。结果表明:在相同工况下,与钢-钢接触副相比,钢-Si_(3)N_(4)陶瓷接触副的系统弹性预紧量较小,系统弹性预紧量受滑块速度影响较大,而受滚珠直径和沟槽曲率比的影响较小。滑块速度增大会使得膜厚和压力明显增大;曲率比增大使得接触区椭圆比减小,膜厚减小,油膜压力增大;滚珠直径增大使得膜厚增大,油膜压力减小。During the assembly of rolling linear guide, preload is necessary of rolling linear guide to improve the machining accuracy and reduce the vibration. In order to study the influence of stiffness of linear rolling guide on its lubrication performance under preload condition, a stiffness model and lubrication analysis model considering preload were established based on LG-45 guide. Effects of ball diameter, groove curvature ratio and speed of the slider on the preloaded amount of the elasticity for steel-steel and steel-Si_(3)N_(4) contact pair system were analyzed. The influence of the stiffness on the lubrication performance was discussed. Results show that, under the same conditions, elastic preload amount of steel-steel contact pair is higher than that of steel-Si_(3)N_(4) ceramic contact pair. Effects of ball diameter and groove curvature ratio on the preloaded amountof the system elasticity aresmall, however, theinfluence of the slider velocity on the amount of preload is obvious. The film thickness and pressure will increase obviously with the increase of slider speed. As the curvature ratio increases, the contact ellipse ratio decreases, film thickness decreases, and the film pressure increases. When the diameter of the ball increases, the film thickness increases, but the film pressure decreases.

关 键 词：滚动直线导轨 预紧 润滑 刚度 系统弹性预紧量 

分 类 号：TH117[机械工程—机械设计及理论]