Analysis on Causes Leading to Rolling Instability in Hot Rolling Wide Strip Steels with Extremely Thin Thickness and Control
Based on the rolling condition of the 2150ASP production line in Hot Rolled Strip Steel Mill of Angang Steel Co.,Ltd.,the smooth folding accidents caused by rolling instability in hot rolling wide strip steels with extremely thin thickness were analyzed.The analytical results showed that,with the last stage of annual overhaul,the precision of the equipment to the finishing mill train and the thickness accuracy in terms of the finishing mill train decreased,and the movement range of the automatic thickness control hydraulic cylinder for its F6 rolling-mill housing was large with fast response,which led to the occurrence of some folding accidents.By optimizing the response speed,movement limitation and selection of functions for the automatic thickness control of finishing rolling,the problem in terms of forward folding accidents caused by rolling instability was effectively solved,and the incidence rates of forward folding accidents was reduced from 0.046%to 0.011%.
hot rolled strip steelrolling instabilitysmooth foldingautomatic thickness control