机械密封磨合过程软质环端面形貌变化的分形表征  

Fractal Characterization of Changing of Surface Topography of the End Face of Soft Ring in Running-in Procedure for Mechanical Seal

作　　者：魏龙[1,2] 常新中[3] 张鹏高[1,2] 

机构地区：[1]南京化工职业技术学院流体密封与测控技术研究所 [2]南京化工职业技术学院江苏省流体密封与测控工程技术研究开发中心,南京210048 [3]河南化工职业学院,郑州450042

出　　处：《中国表面工程》2011年第5期78-82,共5页China Surface Engineering

基　　金：江苏省"六大人才高峰"资助项目(09-D-018)

摘　　要：为研究和掌握机械密封磨合过程中软质环端面形貌的变化规律,在自制的机械密封试验装置上对2套B104a-70型机械密封进行了2种弹簧比压下的磨合试验,采用AF-LI型轮廓仪测量不同工作时段软质环的端面形貌参数,运用分形理论对磨合过程中表面形貌的变化规律进行表征研究。结果表明:软质环端面存在明显的磨合阶段,随着磨合过程的进行,分形维数D和特征分形参数τ*迅速增大,特征尺度系数G迅速减小,当进入正常磨损阶段后,它们都保持较稳定的数值,稳定值分别为D≈1.636、G≈5.7×10-9 m、τ*≈1 030μm。特征分形参数表征磨合表面变化规律的灵敏性高,表征效果好。端面载荷对端面分形参数的变化趋势无显著影响,且对进入正常磨损阶段后的端面分形参数的影响很小,但载荷大磨合期短,弹簧比压为0.15MPa和0.3MPa时,磨合时间分别约为170.5h和110.5h。In order to research and master the changing rules of surface topography in the running-in procedure of the end face of soft ring for mechanical seal,the running-in tests of two different spring pressures in two sets of B104a-70 mechanical seals were tested on the self-designed mechanical seal testing device.Surface topography parameters of different working periods of soft ring were measured by AF-LI profilometer.The changing rules of surface topography in running-in procedure was studied on the characteristic by fractal theory.The results show that there is an obvious running-in stage on the end face of soft ring,fractal dimension D and characteristic fractal parameter τ＊ increase rapidly,and characteristic length scale G decreases rapidly along with running-in procedure,and each of them keeps a stable value for D≈1.636,G≈5.7×10-9m,τ＊≈1 030 μm when entering into the normal wearing stage.The characteristic fractal parameters sensitively cheracterize running surfaces changing rules well.Load of end face has no significant influence on the trend of the fractal parameter of the end face,and it has little influence on the fractal parameter of the end face when in the normal wearing stage.However,the running-in period is short when load is large,and the running-in time is about 170.5 h and 110.5 h respectively when the spring pressure is 0.15 MPa and 0.3 MPa.

关 键 词：机械密封 软质环 磨合 表面形貌 分形参数 

分 类 号：TH136[机械工程—机械制造及自动化]