机械密封磨合过程软质环端面形貌变化的分形表征

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。

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

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 characteri...