Deterioration Diagnosis Method for Ball Bearings that Continue Minute Swaying Motion

概要

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The galvanometer scanner is a type of swaying motor used in laser-drilling machines that is able to position the laser at more than 2,000 points per second. In recent years, the number of holes in printed circuit boards for mobile phones and other electronic devices has increased, so printed circuit boards now have layers and high-density patterns. Therefore, most of the motions of galvanometer scanners are for a short distance and time. The balls in the bearings do not go into 360° rolls, so fretting damage occurs over a long period of time. This is likely to have an adverse effect on positioning accuracy.<BR>In this paper, we propose a deterioration diagnosis method for galvanometer scanners that focuses on ball bearing wear. The proposed method can be used to determine the extent of damage and if the ball bearings need to be replaced. The effectiveness of the proposed method was verified by experiments using galvanometer scanners with laser drilling machines over a long period of time.