Method for measuring connectivity of valley based on three-dimensional surface topography instrument

Abstract

The invention discloses a method for measuring the connectivity of a valley based on a three-dimensional surface topography instrument, and the method provided by the invention is characterized by comprising the following steps; firstly, determining a cross section corresponding to the support rate 80% to serve as the connectivity evaluation reference plane of the valley by utilizing a surface support rate curve which is obtained through the surface topography height data of a measured piece wherein the surface topography height data is measured by the three-dimensional surface topography instrument; solving the binary image of the connectivity evaluation reference plane; then, obtaining each cross-section empty region on the binary image of the evaluation reference plane by utilizing a marker algorithm; solving the size of each cross-section empty region and the minimum width and length characteristics of the channel in the cross-section empty region by utilizing unexpanded form operation and condition expansion operation; solving the connectivity of each cross-section empty region by utilizing connectivity functions; and finally, solving the connectivity parameters of the valleyof the surface topography of the measured piece by utilizing a weighting method. By utilizing the method disclosed by the invention, the connectivity of the valley of the surface topography of the piece is ensured to have a certain amount of expression.

Description

technical field [0001] The present invention relates to the measurement of surface topography, especially the connectivity measurement of the valleys of the surface topography. Background technique [0002] In the latest international standard ISO 25178 for surface topography, five types of parameters are specified for the measurement of surface topography, namely, height parameters, spatial parameters, mixing parameters, functional parameters, and parameters related to surface segmentation. The parameters related to the statistical distribution of values, the spatial parameters reflect the periodicity and directionality of the surface topography in space, the mixing parameters reflect the spatial shape of the surface topography, and the functional parameters include the surface support rate at a certain height obtained from the surface support rate curve and volume parameters, the parameters related to surface segmentation refer to the parameters obtained by the basic textu...

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Problems solved by technology

However, these parameters describing the surface topography lack a close relationship with the surface function. In the microstructure of the three-dimensional surface topography, the part between the peaks is called a valley, and the connectivity between the valleys directly affects the lubricating oil between the surfaces. Therefore, it has a great influence on the lubrication and sealing performance of the part surface, and there is no connectivity parameter and measurement of the valley in the current international surface topography standards and existing surface topography measuring instruments. method

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