Automatic Measurement Of Wear Mark Based On Image Processing

In order to quickly and automatically measure the wear amount of the material in the process of friction and wear,evaluate the wear resistance of the lubricating oil,reduce unnecessary wear according to the degree of wear of the material,thereby improving the service life and wear resistance of the material.In this paper,For example,two kinds of wear scar images were measured by using the wear scar produced by the experimental machine sample.The circular wear scar was collected by a digital microscope and imported into the MATLAB automatic measurement software for image analysis,pretreatment,binary And other processing methods,automatic segmentation of wear marks the area of the wear marks the sample,the use of projection method will be binarized vertical wear marks images accumulate to get the grayscale gray value of the projection curve,according to the wear scar area and non-wear area in the At the junction of the gray value of the mutation,the differential curve of the projection curve,the wear marks the width of the value converted to the differential curve occurs due to the gray value of the two sudden changes in the abscissa of the difference,according to the scale calibration will be measured by the mill The width of the mark corresponds to the number of pixels into the actual length.Qualitative and quantitative experiments were carried out on the measurement results of the wear scar width,and the method of this article and other measurement methods were compared.Circular wear marks using white light interference microscope acquisition of images,the main program ImgScan scanned 2D images,and then Surface Viewer processing and analysis of the wear scar width,wear scar depth,wear scar area parameters,which can calculate the approximate wear volume,to find an approximate Volume wear volume,resulting in 3D stereo images and X/Y/Z coordinates corresponding to the table.The main research contents are as follows:A series of researches and comparisons were made on the method of measuring the wear amount both at home and abroad.The development of the method for measuring the wear amount of the tribological specimen was discussed.The advantages and disadvantages of the present method for measuring the wear amount of the tribological specimen were analyzed and summarized.Different methods for measuring wear marks on two different wear marks are used.The width of the annular wear mark is measured by a digital microscope:a suitable MATLAB image measurement program is compiled and a visual GUI user interface is designed to facilitate the operation of the measurement personnel.The image projection method is used to convert the width of the wear scar into the number of pixels.The scale is calibrated to calculate the actual length corresponding to one pixel,and the inclined strip wear marks collected at the later stage are calibrated.Choose the appropriate threshold segmentation method.Solve the current conventional reading microscope measurement of frequent readings and errors greater problems.Select white interference microscope microscopic measurement of circular wear parameters:the survey found that white light interference microscope abrasion wear measurement experiments less,introduced the working principle of white light interference microscope and measurement procedures,obtained by scanning the wear marks 2D images were analyzed to determine the width of the wear scar,the depth of the wear scar,calculate the approximate volume of the wear scar,generated a 3D image of the wear scar,and calculate the wear volume based on the measured wear scar area and depth and output The data area of the wear marks and X/Y/Z coordinates.Solve the digital microscope can not be measured in the measurement of wear marks the volume of the problem.The program is modularized by MATLAB software,and the accuracy of the measurement platform is verified and verified many times.Two different measuring methods were used to measure the wear of the spherical wear marks respectively.The advantages and disadvantages of the two kinds of measurement methods were compared.The functions and the usage of the automatic wear measurement platform were introduced.The economic and common type of digital microscope replaces the high-precision white light interference microscope to measure the width of the wear scar,and designs the GUI wear scar width measurement platform to realize the automatic and visualization of the wear scar image.The width of the circular wear mark measured by the digital microscope was 0.807 mm.The diameter of the circular wear mark measured by the white light interference microscope was 0.822 mm.The average height of the circular wear mark was 0.065 mm and the approximate wear volume was3.45×10^-2mm².Obtained the 3D images of the wear marks and X/Y/Z axis coordinates,so as to prepare for the later wear simulation experiments.