Application of the electrooptical method for the analysis of surface nanoroughness of raceways of instrument bearings

Abstract

Abstract The control of the microrelief of surfaces of small-size details is a relevant objective for the mechanical engineering. We consider the issue of control by reference surface fragment with the radius of curvature comparable to the size of the fragment. We offer an optical method that uses the binary images of the target and the reference surfaces to control the nanoroughness of raceways of instrument bearings. A quasi-optimal correlation algorithm is used to compare two surface images. The value of the autocorrelation function allows to evaluate whether the roughness of the ring raceway of the instrument bearing corresponds to the norm. The results of the tests of the developed method showed its statistical stability. This allows us to use the method in serial production conditions. The results of nanoroughness analysis of surface with the roughness up to 0.02 microns after grinding with abrasive circles are provided.