The Geometric Dimension Control Of Hot Strip For Guofeng 1450mm Rolling Mill

With the constant improvement of the demand,people also put forward higher requirements about the quality of the strip,the dimension of hot strip is one of the important indicators,including the thickness and width.The mill feed on temperature,material thickness and the nonuniformity of temperature will make steel rolling out relative to the size of longitudinal thickness deviation.To eliminate the thickness deviation,the thickness needs to adapt the control system to control the thickness of rolling process.Good precision of width can not only improve the yield of the product,but also reduce the trimming rate of downstream users and improve production and efficiency.Therefore,the width control can enhance quality.Modern hot-rolled broadband rolling mill mostly used automatic thickness and width control system.In this paper,taking Tangshan Guofeng Steel Co.,Ltd.1450mm hot rolling production line as study background,which was researched based on the process control of strip width and thickness of the factors.The slab itself,equipment and secondary control were analyzed separately,and according to the hot-rolled process theory and rolling model and field production experience,the solution is given.Affect the width of the main reasons are:among the roughing end temperature,temperature drop,specification switch hot coil box is too poor,chemical composition,not new steel mill,mill roll changing calibration and so on.The main reasons of impacting the thickness include width specifications switching,the variation in thickness of the slab,the slab heating mixing and small spread and so on.There are two main reasons for the influence of process control on dimensional accuracy,one is the excessive deviation of self adaptation coefficient,and the other is the parameters of physical model which can’t meet the actual rolling demand.