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由于用户对板带材的尺寸精度和平直度的要求越来越高,瑞典Mefos金属加工研究所与芬兰和瑞典的钢铁公司共同研究出轧制板带材时平直度控制的模型。所研究出的Crownoff和Crown模型用于离线计算四辊轧机以及带轧辊轴向窜动装置的2～6辊轧机所轧制板带的凸度和板形。
Due to the increasingly high dimensional and flatness requirements of sheet metal strips, Mefos Metalworking Sweden has worked with steel companies in Finland and Sweden to develop a model for flatness control of rolled strip. The Crownoff and Crown models developed were used to off-line calculate the crown and plate shape of the rolled strip on a 2-to-6 mill with a 4-high mill and an axial runner with rolls.