基于纵向粗糙纹理的高副接触机械零件的润滑特性探究  

Research of Lurication Characteristic of Mechanical Parts in Higher Pair Contact based on Longitudinal Roughness Texture

作　　者：冯楠[1] 亓秀梅[1] 高创宽[2] 

机构地区：[1]太原理工大学机械工程学院,山西太原030024 [2]杭州万向职业技术学院,浙江杭州310023

出　　处：《机械传动》2015年第9期7-10,19,共5页Journal of Mechanical Transmission

基　　金：国家自然科学基金(50975189)

摘　　要：首先对表面粗糙纹理呈纵向分布的圆盘试件进行了实测,获得了粗糙度数据;接着,运用傅里叶非线性变换得到了表面粗糙度函数;然后,将此函数叠加到油膜厚度方程中建立了高副接触机械零件的混合弹流润滑模型。基于此模型,通过改变润滑剂黏度先后进行了45组数值计算。结果表明:纵向纹理粗糙表面的平均油膜厚度始终小于光滑表面接触时的膜厚值,但当油膜比厚大于一定值后,二者逐渐趋于一致;随着润滑剂黏度的增大,粗糙表面接触应力逐渐降低,但始终大于光滑表面接触应力;然而,无论是粗糙表面还是光滑表面接触,其接触应力均小于赫兹应力。这也再次表明,合理润滑可有效提高机械零件的接触疲劳寿命。The surface roughness data of a disc with longitudinal roughness texture is measured by a roughness profile measuring analyzer firstly. With the help of the nonlinear Fourier transform, the measured data is used to form a roughness function which is then added to the oil film thickness equation and a model of mixed Elastohydrodynamic lubrication for a pair of mechanical parts in higher pair contact is established. Based on this model, 45 groups numerical calculations are carried through changing lubricant viscosities. The computing re- sults show that the average oil film thickness for rough surfaces is smaller than the corresponding value for smooth surface. But the two tend to consistent when the film ratio exceeds a specific value. As the viscosity in- creases, the maximum value of contact stress on rough surface decreases gradually, but it is always greater than the corresponding value for smooth surface contact. However, the both are less than the corresponding Hertz stress regardless of rough or smooth surface contact, which indicates once again that a scientific lubrication is very helpful for increasing the contact fatigue life of mechanical parts.

关 键 词：高副接触 纵向粗糙纹理 实测数据 混合润滑 

分 类 号：TH117[机械工程—机械设计及理论]