腐食損傷の画像処理によるポンプ軸の自動検査システム

概要

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In order to detect corrosion damage like fatigue short cracks and corrosion pits and to estimate remaining life for pump shaft, an automatic inspection system by image processing was developed. The system mainly consists of a mechanical scanner for the pump shaft, an optical microscope, a CCD camera, an image processing unit, 8 mm video recorder and data processing computer. The pump shaft surface was initially ground and polished with ceramic and rubber grinders. After polishing the shaft surface was observed with optical microscope. The magnitude of observation ranges from 50 to 200 depending on the corrosion damage size. The observed surface structure was analyzed as the brightness distribution by the binary code processing. The performance of the developed system was verified with artificial fatigue cracks and actual corrosion pits. The fatigue short cracks could be detected with accuracies of 0.1 mm for length and 3 degrees for angle, and the corrosion pits could be detected with accuracy of 10μm. The system has been applied to more than 250 actual pump shaft for 9 years, and no pump shaft failure has been experienced.
一般社団法人日本機械学会の論文
1999-05-25