Abstract
To efficiently inspect surface defects on steel ball bearings, a new method based on a circumferential eddy current array (CECA) sensor was proposed here. The best probe configuration, in terms of the coil quality factor (Q-factor), magnetic field intensity, and induced eddy current density on the surface of a sample steel ball, was determined using 3-, 4-, 5-, and 6-coil probes, for analysis and comparison. The optimal lift-off from the measured steel ball, the number of probe coils, and the frequency of excitation current suitable for steel ball inspection were obtained. Using the resulting CECA sensor to inspect 46,126 steel balls showed a miss rate of ~0.02%. The sensor was inspected for surface defects as small as 0.05 mm in width and 0.1 mm in depth.
Highlights
Surface defects on steel ball bearings seriously affect the stability and service life of the bearing itself
Using the the inspection inspection system presented presented in in this this study study to to inspect inspect the the steel steel ball ball surface quality automatically, the testing experiments were completed in three steps
The results showed that only 10 defective steel balls were missed—a miss rate of 0.02%
Summary
Surface defects on steel ball bearings seriously affect the stability and service life of the bearing itself. A new method for the quality inspection of steel ball surfaces was proposed based on a circumferential eddy current array (CECA) sensor. The unfolding mechanism of the steel ball is shown, which was mainly comprised of supporting, follower, and friction wheels, and a CECA sensor. Thethe probe coilcoil generated alternating magnetic fields that that induced eddy currents on the steel ball surface ahead of the coil. The probe coil was arranged on the support frame outside the steel ball inspection of closer the surface quality. A compromise scheme was adopted in which the inspection distance
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