鋳片熱間表面疵自動検査装置の開発(探傷技術)(<特集>鉄鋼製造のための新しい計測技術)

概要

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A surface inspection system for hot continuously cast slabs has been developed. The system was designed so as to automatically detect harmful longitudinal cracks, with a width over 0.5mm and a length over 50mm, discriminating them from longitudinal dents. The principle of crack detection is based on the fact that a shadow is produced only at a crack by an appropriate lighting condition. Longitudinal cracks are automatically recognized, using an image processing technique, from the image of slab surface obtained by a line scan camera under the lighting condition. Prototype equipment was manufactured and provided to experiments in order to confirm the performance of the system. On-line experiments showed good results under the good surface condition, namely, the system could inspect harmful longitudinal cracks on the slab surface travelling at a speed of 60m/min in a real-time manner. Based on these experimental results, the on-line equipment inspecting longitudinal cracks is now planned to be installed in Fukuyama Works of NKK.
社団法人日本鉄鋼協会の論文
1984-07-01