A method for evaluating the the overall roughness of the surface of three-dimensional irregular particles

Abstract

The invention provides a method for evaluating the overall roughness of the surface of three-dimensional irregular particles, comprising the following steps: S1, scanning the three-dimensional irregular particles by a three-dimensional scanner to obtain the point cloud data of the surface of the particles; S2, carrying out 3D geometrical reconstruction of the particle surface by using the coordinates of the particle surface points obtained by scanning with the spherical harmonic function with the highest degree n=25, using the reconstructed virtual particles as the reference smooth particles,and evaluating the overall roughness of the particles based on the difference between the real particles and the reference particles; S3, using the reconstructed virtual particles as the reference smooth particles, evaluating the roughness of the real particles based on the volume enclosed between the actual particle surface and the reference particle surface and the reference particle surface area. The invention has the advantages that the whole roughness of the whole particle can be evaluated; The influence of the whole geometry of three-dimensional irregular particles can be considered.

Description

technical field [0001] The invention relates to the evaluation of surface roughness, in particular to a method for evaluating the overall surface roughness of three-dimensional irregular particles. Background technique [0002] Surface roughness refers to the unevenness of small pitches and tiny peaks and valleys on the surface of an object. The distance (wave distance) between the two peaks or two troughs is very small (below 1mm). The smaller the surface roughness, the smoother the surface. [0003] In order to study the influence of surface roughness on the performance of parts and the need to measure the microscopic unevenness of the surface, from the late 1920s to the 1930s, some experts in Germany, the United States and the United Kingdom designed and produced optical microscopes such as optical section microscopes and interference microscopes. The instrument used to measure the microscopic roughness of the surface by using this method creates the conditions for quan...

AI Technical Summary

Problems solved by technology

[0014] (1) For three-dimensional irregular particles, current methods such as the stylus method and interferometry can only measure the local roughness of the particle surface, but cannot evaluate the overall roughness of the entire particle;

[0015] (2) The current roughness evaluation methods and indicators can only consider the influence of local geometric features, but cannot consider the influence of the overall geometry of three-dimensional irregular particles

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