摘要
离合器摩擦副磨合过程对其摩擦性能有重要影响.以铜基粉末冶金摩擦片和65Mn对偶片构成的干式离合器摩擦副为研究对象,针对实车工况,制定加载工况表,利用摩擦磨损试验机(UMT-5)进行销-盘试验:引入摩擦系数采样段均值系数H和摩擦波动系数D,对磨合状态的识别进行了研究;同时分别研究了转速、压力、温度分别对摩擦副磨合进程和磨损量的影响;分析磨合过程对摩擦性能的影响;同时利用白光干涉仪观察磨合过程中的磨擦盘表面形貌,计算接触区域面粗糙度,探究磨合机理.结果表明:当摩擦系数采样段均值系数H≤0.02,且摩擦波动系数稳定在D≤0.16时,认为磨合完成.不同加载工况对磨合快慢有明显影响;与速度和压力两个影响因素相比,温度对磨合过程磨损量的影响更为显著;经历有效磨合过程后的磨擦副摩擦系数较稳定,且比未经历过磨合过程的摩擦副小35%~45%左右,同时磨损量也减小30%~40%;随着磨合时间的增加,面粗糙度初期迅速减小,后期趋于平稳.
The running-in process of dry clutch friction pairs is crucial to the friction performance. By using the dry clutch friction pairs, a copper-based powder metallurgy friction plate on a 65Mn steel plate, the loading condition table was established according to the working condition in practice. Universal Material Tester （UMT-5） was used to conduct using a pin-on-disc configuration. The average friction coefficient H during sampling time and the coefficient of friction vibration D were introduced to recognize the running-in condition. And then, the effects of speed, load and temperature on the running-in process and the influence of the running-in process on the friction performance were analyzed. The surface morphology was observed by white light interferometer and surface roughness was obtained. The average friction coefficient H lower than 0.02 and the coefficient of friction vibration D lower than 0.16 were indication of the end of running-in process. Loading conditions had a significant impact on the running-in efficiency. Compared with speed and load, the temperature had a greater influence on the wear of the friction pair during the running-in process. After running-in process, the friction coefficient decreased by 35%-45% and was stable. In addition, the wear decreased by 30%-40%. In the running-in time, the surface roughness decreased rapidly in the initial stage and then tended to be stable.
作者
李和言
马成男
吴健鹏
师路骐
刘继凯
李明阳
LI Heyan;MA Chengnan;WU Jianpeng;SHI Luqi;LIU Jikai;LI Mingyang(School of Mechanical Engineering, Beo＇ing Institute of Technology, Beijing 100081, China;Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2018年第2期153-160,共8页
Tribology
基金
国家自然科学基金项目(51575042
51775045)资助~~
关键词
摩擦副
磨合过程
销-盘试验
面粗糙度
friction pair
running-in process
pin-on-disc test
surface roughness
