薄带钢冷连轧横向厚差控制理论及DI材横向厚差控制技术研究

针对软质、宽幅、薄带钢冷连轧过程横向厚差(凸度和边降两个指标描述)的生成与控制问题，运用ABAQUS有限元软件建立冷连轧过程辊系-轧件一体化仿真模型，定义用以反映冷连轧各个机架对成品带钢横向厚差控制的贡献大小的指标——横向厚差控制权重，深入研究冷连轧过程带钢横向厚差的生成、遗传规律和其中凸度与边降的相互耦合影响，探索研究软质薄带钢冷连轧过程中横向厚差控制策略及针对DI材的横向厚差控制技术。仿真研究发现，冷连轧机的前两个机架具有远高于其他机架的横向厚差控制权重，是连轧机组中最适于也最有效的控制横向厚差的机架；一般地，第1机架的权重大于第2机架，但带钢材质越软、厚度越薄，第2机架的权重越大，尤其对于极薄且软的带钢，第2机架可以具有大于第1机架的权重；冷连轧过程中通过板形调控机构调控横向厚差时，各机架处带钢边降与凸度的耦合程度从第1架到第5架逐步提高。结合仿真分析结果，研究提出针对国内某1420冷连轧机的DI材横向厚差控制的总体策略和系列技术，并在生产试验后投入长期稳定使用，使该机组的DI材横向厚差控制精度合格率从过去的76.25%提高至92.10%。

Theory and Technology of Transverse Thickness Deviation Control for DI Tinplate during Tandem Cold Rolling

In order to study the transverse thickness deviation’s generation and control of soft, wide, thin steel strip in tandem cold rolling process, which is described by crown and edge drop, the integrated simulation model of rolls and strip is established based on the finite element software ABAQUS. The index of transverse thickness deviation control weight is defined, that is used to reflect the importance of each stand of cold rolling mill to control transverse thickness deviation of finished strip. The law of generation and inheritance of transverse thickness deviation and the coupling effects of crown and edge drop are deeply researched. The control strategy of transverse thickness deviation for soft and thin strip and control technology transverse thickness deviation for DI tinplate in tandem cold rolling process are explored and studied. Simulation results have shown that the weight of first two stands is much higher than other stands in tandem cold rolling mill. They are the most suitable and most effective stands for transverse thickness deviation control. Generally, the weight of stand 1 is larger than stand 2. But when the strip material is softer and the thickness is thinner, the weight of stand 2 could exceed stand 1. The coupling degree of edge drop and crown at each stand gradually improve in the rolling process from stand 1 to stand 5. Combined with the simulation analysis results, the overall strategy and series technologies are proposed for transverse thickness deviation control of DI tinplate at a 1420 tandem cold rolling mill, which are put into long-term and stable use after production testing. The production data show that the qualified rate of DI tinplate transverse thickness deviation control precision is improved from 76.25% to 92.10%.