Development of a method for constructing a 3D image of the surface structure of parts based on their profilograms

Abstract

This work is aimed at obtaining 3D images of the microrelief of working surfaces of machine parts using a profilograph, which represents a simple and convenient approach to analyzing the surface structure. To obtain information about the 3D distribution of height parameters of a microrelief, its structural parameters, rather than microgeometry profile, should be used. To build a 3D model of the microrelief of precision parts, a profilogram obtained by conventional GOST methods is used. The digital values of a signal are entered into a computer in the form of a one-dimensionalarray (the number of elements of this array will determine the size of the generated image). In the process of modeling, new requirements for the microgeometry characteristics of working surfaces are formulated. It is proposed to consider the one-dimensional array as a single random realization of a video camera signal along the X axis. Then its replication along the Y axis will form a 3D model of the examined surface. In order to eliminate the drawback of inadequate imaging of the 3D model of the studied surface, it is proposed to introduce a random component using a pseudorandom number generator to add noise to each successive line of the image under construction. This generator is implemented in the C++ programming language. It was established that video signal graphs for different lines differ significantly, thereby reflecting the real microrelief structure. The proposed method for constructing digital images can be used to obtain a 3 D model of the surface structure under examination for further processing of these signals by an optical electronic method, without using complex and expensive equipment.