辊形配置对辊间接触压力与板形调控影响分析

为系统分析不同辊形配置下辊间接触压力分布形式与板形调控特性,以某1 800 mm热轧生产线使用的2种典型辊形配置为研究对象,建立对应的辊系有限元模型,计算不同带钢规格与调控手段下辊间接触压力分布形式,分析得出常规凸度支撑辊对应的辊间接触压力分布形式与CVC工作辊辊形呈现出明显的对应性,且压力分布形式受轧制规格与调控手段的影响明显小于CVC支撑辊。利用接触压力峰值和不均匀度表述辊间接触压力分布特征,将不同规格与调控手段对辊间接触压力分布特征的影响进行量化处理,得到更为具体的不同参量在整个变化范围内对分布特征的整体影响趋势。同时还对2种辊形配置下不同辊间接触压力对轧机板形调控特性影响进行分析,得出CVC支撑辊对应辊形配置的弯辊力与窜辊位置在板形调控能力上均强于常规凸度支撑辊辊形配置,而不同辊形配置对辊缝形状的影响表现出较为明显的差异,引入辊间接触压力边中比得到调控特性与辊间接触压力之间的具体关系,并结合现场的实际生产数据对仿真分析结果进行验证,研究结果可为现场辊形配置与板形调控提供较好的理论基础和生产指导。

Influence analysis of roll configuration on contact pressure and flatness control

In order to systematically analyze the contact pressure distribution and shape control characteristics between rolls under different roll shape configurations, taking two typical roll shape configurations used in a 1 800 mm hot rolling production line as the research object, the corresponding roll system finite element model was established to calculate the contact pressure distribution between rolls under different strip specifications and control means. The analysis shows that the contact pressure distribution between rolls corresponding to conventional crown backup roll is obviously corresponding to the roll shape of CVC work roll, and the influence of rolling specification and control means on the pressure distribution is significantly less than that of CVC backup roll. The distribution characteristics of contact pressure between rolls are expressed by the peak value and non-uniformity of contact pressure. The effect of different specifications and control methods on the distribution characteristics of contact pressure between rolls were quantified, and the overall influence trend of more specific different parameters on the distribution characteristics in the whole variation range was obtained. At the same time, the influence of different contact pressure between rolls on the shape control characteristics of the rolling mill under the two roll shape configurations was also analyzed. The analysis shows that the roll bending force and roll shifting of CVC support roll corresponding to the roll shape configuration are stronger than the conventional crown support roll configuration, but the increase range is limited, the influence of two different roll shape configurations on roll gap shape shows obvious differences. The edge to center ratio of contact pressure between rolls is introduced to obtain the relationship between regulation characteristics and contact pressure between rolls, and the simulation analysis results are verified in combination with the actual production data, The research results can provide a good theoretical analysis basis and production guidance for the process of roll shape configuration and shape control in the field.