Analysis and control strategy of bending force saturation for HC tandem cold mill
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摘要: 四机架六辊HC冷连轧机组末机架在采用光辊轧制时，工作辊弯辊力常处于饱和状态，致使板形调控能力不足，板形缺陷很难消除或进一步降低，影响了板形质量的持续提升。为此，收集并统计了部分热轧卷的板凸度及其分布，结合前三机架弯辊力的分布特点，分析了热轧来料凸度与冷轧末机架承载辊缝形状的匹配关系及对弯辊力的影响。同时分析了利用中间辊负窜来降低弯辊力的在线调整方法对带钢表面质量的影响。在此基础上，提出了采用多段式凸度辊辊型来解决末机架弯辊力饱和的调控策略。在分析辊型参数对板形影响的基础上，通过多次凸度工作辊轧制试验，获得了较优的六次多项式辊型参数。辊型试验结果也表明，在末机架采用五段式正凸度工作辊可增大弯辊的调节能力，减小中间辊负窜量，能有效地解决末机架弯辊力饱和的问题，可进一步提升带钢板形质量。Abstract: The work roll bending force of the last stand of the four stands 6-Hi HC tandem cold rolling mill is usually in saturation state when the brightwork roll is used in the last stand. This production phenomenon leads to the lack of the ability to control the strip shape, and then the shape defects are difficult to eliminate or further reduce. In the meantime, these restrict the continuous improvement of the shape quality of the cold-rolled strip. Therefore, the crown data of some hot-rolled coils were collected, and then its distribution was computed. Combined with the distribution characteristics of the work roll bending force of the first three stands, the relationship between the hot-rolled strip crown and the shape of the loaded roll gap and its impact on the work roll bending force was analyzed. Meanwhile, the influence of the online adjustment method to reduce the work roll bending force by using the negative displacement of intermediate roll on the surface quality of strip was also analyzed. On these bases, a control strategy of using a multi-section positive crown work roll was proposed to solve the saturation of the work roll bending force of the last stand. With the help of analyzing the influence of work roll profile parameters on the strip shape, the optimized parameters of sixth-order polynomial work roll were finally obtained through several online crown work roll rolling tests. In addition, the test results also showed that using five sections of positive crown work roll in the last stand can increase the adjustment ability of the work roll bending and reduce the negative displacement of the intermediate roll. This phenomenon can effectively solve the problem of the saturation of the work roll bending force of the last stand and improve the quality of the strip shape’s quality.
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Key words:
- HC mill /
- roll bending /
- roll shifting /
- hot-rolled strip crown /
- work roll contour
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图 1 平辊轧制薄规格时工作辊弯辊力分布
Figure 1. Bending force distribution of work rolls when rolling thin gauges with flat rolls
图 3 带钢来料与末机架承载辊缝形状
Figure 3. Strip steel incoming material and the shape of the roll gap of the final frame
图 6 辊型参数变化对板形的影响
Figure 6. The influence of the change of roll shape parameters on the shape of the plate
图 7 平辊与凸辊轧制力与窜辊值对比
Figure 7. Comparison of rolling force and roll shifting value between flat roll and convex roll
表 1 辊型参数变化范围
Table 1. Variation range of roll contour parameters
中部凸度
$ {C_1} $/μm边部凸度
$ {C_2} $/μm端部凸度
$ {C_3} $/μm长度
$ {L_1} $/mm长度
$ {L_2} $/mm1～9 10～30 40～80 600～850 900～1100 
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表 2 板形计算用轧制参数示例
Table 2. Rolling parameters for flatness calculation
轧制速度/（m·min−1） 摩擦
系数前张力/kN 后张力/kN 入口厚度/mm 出口厚度/mm 宽度/mm 工作辊
弯辊力/MPa中间辊
窜辊/mm850 0.05 21 120 0.65 0.52 1010 5 20
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