微量第二润滑介质辅助的增强水润滑研究  

Enhancing Water Lubrication by Secondary Assistant Lubricant in Small Quantity

作　　者：禹涛 张晓寒 郭峰 金微 梁鹏 YU Tao;ZHANG Xiaohan;GUO Feng;JIN Wei;LIANG Peng(School of Mechanical&Automotive Engineering,Qingdao University of Technology,Shandong Qingdao 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520

出　　处：《摩擦学学报》2022年第2期358-365,共8页Tribology

基　　金：国家自然科学基金项目(51775286);山东省重点研发计划项目(2019GHY112059)资助。

摘　　要：研究了一种微量第二润滑介质辅助的增强水润滑方案.在水润滑环境下,测量了丁腈橡胶块-不锈钢环接触入口区短时(10 s)注入微量乳化油(100μL)时的摩擦力特性.结果表明:在试验工况下短时注入微量乳化油降低了橡胶块磨损.低速时,摩擦副处于混合润滑状态,短时注入的乳化油减摩效果明显;速度升高时,短时注入的乳化油使轴承特性系数增加,会引起摩擦力增加.此外,在水环境下利用线接触光干涉技术揭示了乳化油以离水展着的方式形成承载润滑膜.研究工作为应对短时恶劣工况下的水润滑失效提供新的思路,为水环境下微量乳化油的辅助润滑调控提供数据支持.Water lubrication has the advantage of no pollution and low cost.However,due to its poor load-bearing capacity,a water-lubricated bearing is often under the boundary/mixed lubrication regime during the service,where excessive wear can be found.Previous research has improved the performance of water lubricated bearings.However,the bearing is still prone to lubrication failure when it is subjected to severe working conditions,such as the stern bearing of ships due to low speed,heavy load,short-time load impact.In the present paper,an enhanced water lubrication scheme by small quantity secondary assistant lubricant was proposed to deal with the water lubrication failure under short-time severe conditions.A block-on-ring test rig was used to validate the idea.The material of the block was NBR3606,and the ring was made of 316 stainless steel.The secondary lubricant used was commercial emulsion oil.To facilitate the supply of the small quantity secondary lubricant,a nozzle was placed near the entrance of the contact region,and its direction was arranged in such a way to avoid the revers flow.The block-on-ring contact was immersed totally in water.The friction coefficient of the contact at different speeds was measured to find the boundary/mixed lubrication regime,where small quantity secondary lubricant was applied.The friction coefficient of the block-on-ring was further measured when small quantity emulsion oil was injected into the entry zone of the contact under boundary/mixed lubrication regime.The injection speed was 10μL/s and the injection time was 10 s.During the experiment,the running-in time for the block-on-ring contact was 600 s,so that the friction coefficient can become stable.Emulsion oil was then supplied to the contact area.The total test time was 1800 s.The applied loads were 350 N and 1 kN.The results showed that the wear of the block can be reduced by short-time supply of small quantity secondary lubricant(emulsion oil)under the conditions of boundary/mixed lubrication.Furthermore,there was a crit

关 键 词：第二润滑介质 水润滑 乳化油 润滑状态 减摩降磨 

分 类 号：TH117.2[机械工程—机械设计及理论]