“哑铃状”平面形状轧制法在中厚板生产中的应用

中厚板轧制过程中，由于板坯在长度和宽度方向的端部会产生不均匀变形，使轧后的钢板平面形状一般非矩形，从而造成钢板的切头、切尾和切边量增加，严重影响中厚板成材率。根据不同坯料规格和展宽比条件下的塑性变形特点，在轧机负荷和液压系统硬件配置不变的前提下，采用轧件的“哑铃状”轧制法进行平面形状控制，通过长度精准计算模型及打滑因子修正方法，实现轧件长度的精准跟踪；通过多点设定方法，得到更加精细化的平面形状控制曲线，使最终产品达到切头、切尾量最优化要求。“哑铃状”轧制法投入实际应用后，与传统轧制法相比综合成材率平均提高了0.59%。

Application of dumbbell shaped rolling method in medium and heavy plate production

In the process of plate rolling, due to the inhomogeneous deformation of the slab at the end of length and width directions, the plane shape of the rolled steel plate is generally not rectangular, resulting in the increase of the cut amount of head, tail and edge of the steel plate, which seriously affects the yield of the medium and heavy plates. Based on the plastic deformation characteristics under the conditions of different slab size and width ratio, as well as the premise of the constant load of the rolling mill and the hardware configuration of the hydraulic system, the "dumbbell" rolling method of the rolled piece is used to control the plane shape. Through the accurate calculation model of length and the correction method of slip factor, the precise tracking of the rolling length can be realized, and the more refined plane shape control curve can be obtained by the multi point setting method. The final product can meet the requirements of the optimization of the amount of the head cutting and tail cutting. After the "dumbbell" rolling method was put into practical use, the overall finished product rate was increased by 0.59% on average compared with the conventional rolling method.