Grinding crack diameter measurement method based on steel ball grinding crack gradient

Abstract

The invention discloses a grinding crack diameter measurement method based on the steel ball grinding crack gradient. The method specially includes the following steps of collecting a grinding crack image of a steel ball through a scanning mirror, inputting the grinding crack image into a computer, graying the colorful grinding crack image to obtain a grinding crack gray-scale map f, conducting scale detection to obtain a grinding crack scale initial map CC, calculating the length HD of a unit pixel, calculating the gradient of the grinding crack grey-scale map f to obtain a gradient map G of the grinding crack grey-scale map f, conducting binarization processing on the gradient map G to obtain gradient segmentation maps MG, conducting mathematical morphology closed operation on the gradient segmentation maps MG to obtain a gradient connection map OG, conducting mathematical morphology open operation on the gradient connection map OG to obtain a gradient grinding crack map CG, conducting fragment removing operation on the gradient grinding crack map CG to obtain a grinding crack initial map CM, conducting cavity filling operation on the grinding crack initial map CM to obtain a grinding crack map FM, and calculating the grinding crack diameter of the steel ball. The method is high in processing speed, high in measurement accuracy, capable of being conveniently stored for a long time as permanent data, and capable of being used for development work of novel lubricants.

Description

technical field [0001] The invention relates to a method for measuring the diameter of wear scars based on the gradient of steel ball wear scars. Background technique [0002] Lubricating oil is a liquid lubricant used in various machinery to reduce friction and protect machinery and processed parts. The quality of lubricating oil is mainly judged by viscosity, oxidation stability and lubricity. Viscosity is an index reflecting the fluidity of lubricating oil; oxidation stability indicates the anti-oxidation ability of the oil in the use environment; lubricity indicates the anti-friction performance of lubricating oil. Once the anti-wear performance of lubricating oil decreases, it will aggravate the wear and abrasion of high-temperature operating parts. Therefore, timely and accurate determination of the wear resistance of lubricating oil is particularly important for protecting machinery and prolonging its working life. [0003] The four-ball wear tester is used to eval...

AI Technical Summary

Problems solved by technology

However, the method has the following shortcomings: First, the measurement angle in the measurement process is difficult to ensure

The second is that the wear scar is almost impossible to be a regular circle, it is difficult to find the equivalent circle of the wear scar when measuring, and there will be a large error in the measured diameter

The third is that it is difficult to guarantee the measurement accuracy when the axis of the upper ball and the oil cup are not aligned or the wear scar is elliptical.

Fourth, the measurement is time-consuming and laborious

When the measurement personnel are inexperienced or the shape of the wear scar is irregular, it is often necessary to perform multiple repeated measurements, which is time-consuming and laborious

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