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선삭가공에 있어서 AE 신호와 표면 거칠기에 의한 공구손상에 대한 평가
한응교,이범성,박준서,Han, Eung-Gyo,Lee, Beom-Seong,Park, Jun-Seo 한국정밀공학회 1992 한국정밀공학회지 Vol. No.
In this study, using in-process tool failure detecting system by AE method in turning machining, we measured AE signal from the tool, and the surface roughness of workpiece and then compared it with tool wear. As a result, we found that tool failure can be predicted by means of surface roughness of the workpiece and it can be predicted more precisely by the arithmetical average roughness (Ra) than by the maximum height of irregularities (Rmax) of the workpiece. Also, we found that we could judge whether it was sudden failure or the wear by means of the shape of AE signal and the range distri- bution of power spectrum frequency when tool danage was happened.
가연성(可燃性)물질의 중량 연소속도 측정에 관한 실험적 연구
박영조,한응교,김상욱,박원영 한국산업안전학회 1987 한국안전학회지 Vol.2 No.1
A study was performed on combustion rates of three kinds of combustible substances under a few different combustion conditions. To measure the combustion rates by meight method, I contrived an apparatus using a sensitive load cell. The experimental results by the combustion tests of various combustible substances shows that the combustion circumstances, eg., air supply condition and the existence of flammable oil. And it is found that the time constant T in case of oil absence is smaller than that in case of oil existence, and the time constant T in case of enforced air-entrained condition is greater that in case of natural air-entrained condition.