The Use of Computed Tomography to Analyse Grinding Smudges and Subsurface Defects in Roller Bearing Rings

Abstract

This article shows that changes occurring on the surface of roller bearings in the form of grinding smudges stem from the subsurface material defects of these elements. The authors discuss how the smudges are created and show the results of computed tomography tests conducted for roller bearing rings with the above-mentioned defects. The ring reconstruction images are presented, and the defects are located and described with the use of reverse engineering. The defects identified are presented in radiographs. The topography tests confirmed the existence of subsurface defects that emerge on the surface in the form of smudges, once the grinding of an element starts.

Influence of Geometrical Features of Material Defects on the Identification Level by the Eddy Current Method

“…An important challenge is an inexpensive detection of subsurface flaws found in the bearing ring. Some literature indicates the correlation between grinding streaks and hidden discontinuities in the material [2]. The issue is not exactly identified and requires further research.…”

“…The production process of a bearing ring consists of three main steps (forging, turning, grinding). As a result of the improper ongoing process of forging or a faulty metallurgical material, the finished product may develop material discontinuities in the form of voids, cracks, or non-metallic inclusions [1]. An important challenge is an inexpensive detection of subsurface flaws found in the bearing ring.…”

Research on machining topography of point grinding based on correlation function method

“…Thus, it will improve the corrosion resistance of workpiece. [19][20][21] Therefore, study on the characteristics of surface topography after the manufacturing process is of great importance. 21,22 Combining with the advantages of point grinding technology illustrated above, it is significant to evaluate the topography of point grinding.…”

An Improved Quasi-Dynamic Analytical Method to Predict Skidding in Roller Bearings under Conditions of Extremely Light Loads and Whirling

“…In addition, based on the computed tomography, Zbrowski and Matecki analyzed the grinding smudges and subsurface defects in roller bearing rings [10]. Zhang [11] and Li et al [12] analyzed various factors that influence slip and developed skidding analysis software for high-speed roller bearings.…”