摘要
牙轮钻头滑动轴承作为钻头破岩过程中传递载荷的关键部件,在低速重载的钻井过程中易发生黏着磨损失效。为改善牙轮钻头滑动轴承的耐磨性能,利用纳秒激光雕刻技术,在牙轮钻头滑动轴承轴颈表面加工了面积比为10%、深度为20μm的圆形、矩形、三角形及复合织构;基于赫兹相似理论,设计近似模拟钻头轴承工况的环-块配对副单元实验方案,并在UMT摩擦试验机上开展织构形状对钻头滑动轴承摩擦副摩擦因数、磨损量、温升变化和微观形貌影响规律的实验研究。结果表明:仿生织构的形状及布置方式对减摩和耐磨效果影响极大,其中圆形、矩形织构的减摩和耐磨性能最优,其次为三角形织构,而复合织构反而增大了摩擦因数及磨损量;单一织构对试件磨损量及温升的影响不大,而复合织构在增加摩擦的同时温度有明显升高,不利于井下高温环境下延长牙轮钻头寿命。
As a key part of load transfer in rock breaking process,the roller bit sliding bearing is prone to adhesive wear failure during low-speed and heavy-load drilling.In order to improve the anti-wear of the roller bit sliding bearing,circular,rectangular,triangular and composite textures with an area ratio of 10%and a depth of 20μm were arranged on the bearing journal surface by using nanosecond laser engraving technology.Based on the Hertz similarity theory,a unit experiment scheme was designed to simulate the working conditions of bit bearing.The experimental study on the influence of texture on friction coefficient,surface wear,temperature rise change and microstructure of roller bit sliding bearing was carried out on UMT friction tester.The results show that the circular and rectangular textures have the best friction reducing and anti-wear effect,following by triangle texture,while the composite texture increases the friction coefficient and wear of bit bearing.The single texture has little effect on the wear and temperature rise of the specimen,while the composite texture increases the friction and the temperature rise obviously,which is not conducive to prolong the life of the roller bit under the high temperature environment.
作者
钟林
魏刚
李宇
危鹏
郭项伟
ZHONG Lin;WEI Gang;LI Yu;WEI Peng;GUO Xiangwei(School of Mechanical and Engineering,Energy Equipment Research Institute,Southwest Petroleum University,Chengdu Sichuan 610500,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2020年第3期27-32,共6页
Lubrication Engineering
基金
国家自然科学基金项目(51775463,51505397).
关键词
织构形状
牙轮钻头
滑动轴承
纳秒激光
摩擦磨损
texture shape
cone bit
sliding bearing
nanosecond laser
friction and wear
