滚动直线导轨副摩擦系数试验研究  

Calculating and Experiment Study on Friction Coefficient of Linear Rolling Guide

作　　者：任士豪 周长光 叶坤奇 冯虎田[1] 张一慎 REN Shihao;ZHOU Changguang;YE Kunqi;FENG Hutian;ZHANG Yishen(School of Mechanical,Nanjing University of Science and Technology,Jiangsu Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《摩擦学学报》2022年第2期305-313,共9页Tribology

基　　金：国家科技重大专项(2019ZX04010001);国家自然科学基金项目(51905274)资助。

摘　　要：针对目前缺少滚动直线导轨副摩擦系数试验研究的现状,首先基于动力学分析,推导了滚动直线导轨副预加载荷与摩擦系数的关系式;然后创新性设计了一种预加载荷调节装置,构建了一种预加载荷与预紧拖动力同步在线测量系统,实现了不同载荷和速度下滚动直线导轨副动态摩擦系数的精确测量.试验结果表明:速度一定时,摩擦系数随预加载荷增大而增大;预加载荷一定时,摩擦系数随速度增大先减小后增大;预加载荷越大,摩擦系数受速度影响程度越小.In this paper,we analyzed the dynamic behavior of the ball,and then derived the correlation between the preload and the friction coefficient of linear rolling guide.As the preload cannot be directly measured and was hard to be adjusted once of the linear rolling guide was assembled,we designed a novel preload adjustable loading device mainly consisting of an ultra-precision flat jaw forceps(HERBERT MPV160A),two extrusion blocks,two cylindrical blocks,a separated slider(THK SHS35V)and a pressure sensor(FUTEK-LCA300).Combined with the main worktable and the S-type force sensor(FUTEK-LSB350)and the ball screw feeding system,a synchronous online measurement system of both the preload and the preload drag force was constructed.In such a system,the slider was fixed on the ultra-precision flat jaw forceps and the preload can be adjusted and measured by the pressure sensor(FUTEK-LCA300);the rail was connected with the ball screw nut through the main worktable and the force sensor(FUTEK-LSB350),and can move back and force along the screw axis with the nut when the servo motor rotated,during which the preload drag force of the linear rolling guide can be measured by the force sensor(FUTEK-LSB350).Accordingly,the preload and the preload drag force can be measured simultaneously,based on which the friction coefficient under different preloads and running speeds can be obtained.In the experiment,the friction coefficient of linear rolling guide THK SHS-35V was measured under four different preloads(1600 N,3100 N,6100 N and 9600 N)and five different running speeds(1200 mm/min,2400 mm/min,3600 mm/min,4800 mm/min and 6000 mm/min).The experimental results showed that,the friction coefficient increased with increasing preload at a certain speed,while firstly decreased and then increased with increasing speed at a certain preload.Due to the geometry error of the rolling element and raceway,the preload and preload drag force were always changing when the position of slider on the rail varied.The higher the preloading level,the lower

关 键 词：滚动直线导轨副 预加载荷 摩擦系数 预紧拖动力 预加载荷可调装置 

分 类 号：TH117.1[机械工程—机械设计及理论]