摘要
线接触润滑经常出现因润滑剂补充受限而造成乏油现象,通过开发新的润滑补给策略实现润滑增效延长部件使用寿命至关重要。通过建立亲油V型阵列图案制备梯度润湿性表面,应用润滑油膜光干涉测量仪,试验测量圆柱滚子-玻璃盘线接触条件下阵列图案长度、图案方向以及图案角度在限量供油条件下对油膜厚度的影响。结果表明,亲油V型阵列图案改变了润滑轨道的集油,改善了入口处供油,提高了润滑油膜厚度。当图案宽度与润滑轨迹宽度相近时润滑效果最佳,两者宽度相等,当试验速度较高时(u=640 mm/s、800 mm/s),对于1μL的供油量,油膜厚度提升率分别可达17.3%、23.6%;反向亲油V型阵列(V型开口方向指向接触区)所形成的“油墙”能够显著增加入口的集油能力,亲油V型图案相较于间隔润湿图案表现出更高的油膜厚度。提出了利用V型阵列润湿图案实现润滑增效的方法,可为具有几何图案化润湿性表面抗磨减摩的涂层设计及工程应用提供研究基础。
Line contact lubrication often suffers from oil starvation due to inadequate lubricant replenishment.Developing new replenishment strategies is essential for enhancing lubrication efficiency and extending the lifespan of components.This study presents an innovative lubrication replenishment technique by establishing oleophilic V-shaped array patterns on the surface using a chemical coating(AF)method.Via a lubricant film interferometry system,experiments were conducted to assess the impact of pattern length,orientation,and angle on oil film thickness under limited oil supply conditions in cylinder roller-glass disc line contact.The results reveal that the non-uniform wetting properties created by the oleophilic V-shaped array patterns facilitate the smooth flow of oil back to the center of the track,thereby improving oil supply at the inlet and increasing the lubricant film thickness.The pattern length influences the smoothness of lubricant flow from the sides to the center,with optimal lubrication achieved when the pattern width matches the track width.At high experimental speeds(u=640 and 800 mm/s),the oil film thickness enhancement rates for a 1-μL oil supply reach 17.3%and 23.6%,respectively.However,a significant difference between the pattern width and lubrication track results in an increased time for the lubricant to return from the side ridges to the track,leading to insufficient replenishment at the inlet and worsening oil starvation.Fluorescence microscopy observations of oil pools at the inlet during backward and forward pattern movements reveal wave-like formations along the width of the roller.During backward movement,the V-shaped array(with the V opening facing the contact area)effectively reduces oil backflow and side leakage,significantly enhancing oil collection capacity at the inlet and increasing the amount of oil absorbed.By contrast,during forward movement,the V-shaped pattern accelerates oil diffusion to the sides of the track,resulting in lower oil film thickness than the original surface and exacerbating oil starvation.Further investigations using lubricants of varying viscosities show that as viscosity increases,oil starvation during forward movement becomes more pronounced,as higher viscosity hinders backflow.The study also examines the effect of pattern angles on oil film thickness and compares the oil film enhancement rates of the oleophilic V-shaped array pattern with spaced wetting patterns under similar conditions.The results indicate that the V-shaped wetting pattern exhibits higher oil film enhancement rates than spaced wetting patterns across different viscosity lubricants.For example,the oil film growth rates for the 120°V-shaped wetting array surface under PAO4,PAO8,and PAO20 are 109.298%,187.335%,and 13.84%,respectively,whereas the 180°interlaced wetting surface shows film thickness enhancement rates of 58.79%,-1.74%,and-19.72%,respectively.This phenomenon becomes more evident as lubricant viscosity increases.The different film formation mechanisms between the two patterns likely contribute to these results.During backward movement,more oil accumulates in the geometrically reduced areas of the V-shaped pattern,creating additional pressure in the inlet oil pool and increasing oil absorption.However,during operation,some AF may transfer to adjacent hydrophilic areas on the 180°interlaced wetting surface,reducing surface energy and causing dewetting,which enhances oil film load-carrying capacity.The proposed method of employing chemically coated V-shaped array patterns to enhance lubrication is simpler,more efficient,and cost effective as compared with manufacturing techniques involving physical texturing.It provides a pathway for reducing wear and friction in line contact components and lays a research foundation for designing and applying geometrically patterned wetting surfaces in engineering.
作者
刘玉婷
郭峰
李自颖
金微
荆兆刚
陈青松
LIU Yuting;GUO Feng;LI Ziying;JIN Wei;JING Zhaogang;CHEN Qingsong(College of Mechanical&Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;Shandong Zhongli Auto Parts Manufacturing Co.,Ltd.,Liaocheng 252665,China)
出处
《中国表面工程》
北大核心
2025年第1期162-171,共10页
China Surface Engineering
基金
国家自然科学基金(52175173)。
关键词
限量供油
线接触
V型
润湿图案
油膜厚度
limited lubricant supply
line contact
V-shaped
wetting pattern
oil film thickness
作者简介
刘玉婷,女,1998年出生,硕士。主要研究方向为线接触流体动压润滑及界面效应。E-mail:liuyutingqut@163.com;通信作者:郭峰,男,1968年出生,博士,教授,博士研究生导师。主要研究方向为边界滑移条件下润滑薄膜的机理研究、微米/亚微米润滑油膜的光学测量和实验技术。E-mail:mefguo@qut.edu.cn。
