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열연강판 선후단부 폭 정밀도 개선을 위한 최적 엣저롤 개도 제어
천명식,이준정,문영훈,Chun, Myung-Sik,Yi, Joon-Jeong,Moon, Young-Hoon 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
adaption of the model predictions is highly desirable. In general, the width deviation at the head and tail ends of strip may be different from that of the steady state region. Therefore, the dynamic edger corrections can be used to compensate the width deviations which would otherwise occur. For the precise width control, the effect of edger roll gap and rolling conditions on the width deviation of head and tail ends of strip has been investigated and the effective method to decrease width deviation has been proposed. On-line application of dynamic edger control method in this study shows about 50% width compensation at the head end of the strip, and near perfect compensation at the tail end of strip.
논문 : 기계가공 ; 극저탄소열연강판의 Edge Scab 표면결함 발생원인 규명
유재화 ( Jae Hwa Ryu ),윤보현 ( Bo Hyun Yoon ),천명식 ( Myung Sik Chun ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
The cause of the edge scab defects in the hot-rolled ultra-low carbon steels was investigated through the examination of the shape and microstructure of the bar corner, the measurement of temperature distribution over the bar width and the physical modelling of the deformation behaviour at the bar corner by using a plasticine. It was found that the edge scab was originated from the abnormal micro-bulging at the bar corner, where ferrite was formed due to the local temperature drop. The amount of the defective strips was considerably decreased by reducing the number of descaling and by increasing the reheating temperature.