关键词: 机械密封, 表面形貌, 三维重建, 分形, 孔隙率

Abstract: In order to characterize the surface 3D topography and leakage path of mechanical seal end faces accurately and conveniently, a 3D reconstruction program for surface topography of mechanical seal end faces was developed and studied based on 2D sectional images. A new characterization parameter for surface topography of mechanical seal end faces was proposed and based on voxel an algorithm was established to calculate the fractal dimensions and the porosity. The results show that it is effective to reflect the 3D box-counting dimension, porosity and other parameters of surface topography of mechanical seal end faces with 3D reconstruction based on sectional images. The surface porosity of different layers has a law of change, so when the volume porosity is constant, the formation and the scale of leakage path of mechanical seal end faces will be dominated by the change of surface porosity distribution on different sectional images. The sampling number of layers have a great influence on the calculating results when it is fewer, however, the influence becomes smaller as the number reaches a certain value.

Key words: mechanical seal, surface topography, 3D reconstruction, fractal, porosity