激光织构表面对脂润滑向心关节轴承摩擦性能的影响

发布时间：2018-01-12 12:34

本文关键词：激光织构表面对脂润滑向心关节轴承摩擦性能的影响　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：为研究在低速重载脂润滑条件下向心关节轴承的摩擦学特性,在轴承内圈外表面上采用激光微造型技术设计制造出随机正方形凹坑、规则圆形凹坑、规则矩形凹槽三种不同形状的微织构。选用PWNS-200型电液伺服疲劳磨损拉扭试验机,润滑剂使用二硫化钼锂基脂,在不同载荷、转速等工况条件下进行试验研究,探讨表面形貌中织构形状、深度和面积密度三个参数对向心关节轴承摩擦特性的影响规律。用三维表面形貌参数表征织构的表面形貌,从而得出表征参数与摩擦系数的关系。在试验研究的基础上,用有限元软件ANSYS建立关节轴承的有限元模型,研究在额定静载荷下,不同数量和尺寸的油槽对向心关节轴承应力应变等特性的影响,结合脂润滑下的实际工况条件,对油槽参数提出了优化方案。结果表明:脂润滑状态下,载荷、线速度等工况条件和深度、面积密度、形状等织构参数均会影响织构表面的摩擦系数;激光微织构可以减小摩擦系数,改善轴承的摩擦学性能,其中面积占有率为5%、深度为15μm的随机正方形微织构表面效果最好;高度参数、功能参数和特征参数表征效果较好,空间参数和混合参数的表征效果不理想;GE45ES向心关节轴承在脂润滑条件下,最优的油槽参数为:油槽数量为1,宽度为3.5 mm,深度为1.5 mm,开在内圈外表面上。本研究可为向心关节轴承的织构设计、表面形貌表征和油槽设计提供参考。
[Abstract]:In order to study the tribological characteristics of the radial joint bearing under the condition of low-speed and heavy-duty grease lubrication, the random square pits and regular circular pits were designed and manufactured on the inner and outer surface of the bearings by laser micro-modeling technology. There are three kinds of microtextures in regular rectangular grooves. PWNS-200 type electro-hydraulic servo-fatigue wear and torsion testing machine is used. The lubricant uses molybdenum disulfide lithium-based grease under different loads. Under the condition of rotational speed and other working conditions, the texture shape of the surface morphology was investigated. The influence of depth and area density on the friction characteristics of the radial joint bearing was studied. The surface morphology of the texture was characterized by three dimensional surface topography parameters. On the basis of experimental research, the finite element model of joint bearing is established by using finite element software ANSYS, and the finite element model is studied under rated static load. The effects of different numbers and sizes of oil grooves on the stress-strain and other characteristics of radial joint bearings are discussed. Combined with the actual operating conditions under grease lubrication, the optimization scheme of oil tank parameters is proposed. The results show that the load is under grease lubrication condition. The friction coefficient of texture surface can be affected by the parameters of linear velocity, depth, area density, shape and so on. Laser microtexture can reduce the friction coefficient and improve the tribological properties of bearing. The surface effect of random square microtexture with area occupation ratio of 5 渭 m and depth of 15 渭 m is the best. The performance of height parameter, function parameter and characteristic parameter is better than that of spatial parameter and mixed parameter. Under the condition of grease lubrication, the optimum parameters of GE45ES radial joint bearing are as follows: the number of oil tanks is 1, the width is 3. 5 mm, and the depth is 1. 5 mm. This study can be used as a reference for the texture design, surface morphology characterization and oil tank design of the centripetal joint bearing.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.3

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