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针对1580mm热连轧生产线薄规格带钢凸度控制精度不高的问题,通过对引进的板形控制模型原理解析及板形生产数据的跟踪,发现了该模型存在明显的目标凸度重置问题,从而影响了该产线的凸度控制精度。经过对大量板形工艺数据的对比分析,发现在板形设定计算过程中,由于平坦区因子、热膨胀等关键参数的设计不合理,导致了模型对前3组机架的凸度调节能力出现了误判,造成了目标凸度重置问题的发生。通过在线实施优化平坦度死区因子和热膨胀计算乘子等改善凸度控制精度的措施,基本解决了该产线的目标凸度重置问题,提高了1580mm生产线轧制带钢的凸度控制精度。 相似文献
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宽带钢热连轧机多机架板形控制模型的探讨 总被引:1,自引:0,他引:1
热轧板形自动控制系统是多机架的控制系统。根据板形生成的原理和过程,从刚度和板形控制的关系出发,研究热连轧多机架板形平坦度生成及遗传规律,建立了热连轧多机架板形控制数学模型。 相似文献
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板形设定模型是整个板形自动控制系统中非常重要的一部分,决定着带钢头部板形的控制精度。板形精度既为热轧带钢的一项重要质量指标,又为衡量产品市场竞争力的主要因素。板形控制是带钢热轧的核心技术,为目前轧制技术研究开发的热点。阐述了鞍钢1780线PC轧机板形设定模型功能和构成,对轧辊热凸度模型参数进行了优化,在模型自学习中对各机架给予适量的平直度及凸度反馈,从而提高了板形设定模型精度。由于实际轧制过程的非线性、时变性,传统PID的控制已近极限,为进一步提高控制品质,板带平直度反馈采用非线性PID控制策略,其参数整定范围较宽,易于工程实现。通过对现场大量的轧制数据统计,在应用模型参数优化程序后,热轧板的平直度与凸度的头部命中率有了一定的提高。 相似文献
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板带轧机辊缝影响因素与板形的关系 总被引:1,自引:0,他引:1
通过板带轧机辊缝形状诸因素对带钢断面形状影响的分析,阐述了轧制力、弯辊力以及HC、CVC和PC轧机可控辊形等工艺与带钢板凸度、平直度的关系,为保证良好板形、制定合理的工艺制度提供了依据. 相似文献
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应用变接触长度支承辊提高板形综合调控能力 总被引:22,自引:4,他引:18
介绍用于宝钢冷轧厂2030mm全连续冷轧机上的变接触长度(VCL)支承辊新技术及其生产实绩。该技术对提高板形综合调控能力效果显著;对新建板带轧机或已有的旧式板带轧机的技术改造均有推广价值。 相似文献
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It is a complicated problem for cold-rolled strip to improve asymmetric strip shape in strip production. A roll system and strip coupled model of six-high cold rolling mill was established with finite element method to estimate the effect of intermediate roll shifting, tilting, symmetric and asymmetric bending technologies on strip profile. To reduce asymmetric defects of strip shape as much as possible, some control strategies were proposed, including tilting and asymmetric bending of intermediate roll and work roll. The combinations of these three control strategies can effectively eliminate asymmetric strip shape defects. Finally, the closed-loop control model of asymmetric flatness at the last stand was given, and the flatness control system with the function of asymmetric strip shape control was also designed for cold tandem mill. 相似文献
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The precision of strip flatness depends on several factors; wear of rolls is one of the main variables that have influence on the surface quality of the strip. The wear of the roils represents a complex friction condition, sometimes the wear in the backup roll is not analyzed because the strip is not in contact with the backup roll; however, after several campaigns of rolling, the wear in the backup roll becomes dangerous because the pressure distribution is not uniform. Investigation of mechanism of the surface deterioration of the backup roll for the hot strip rolling is very important for the development of the automatic strip shape control system used in hot strip mills. A mathematical model is developed considering the Hertzian pressure distribution between two cylinders with parallel axes. It is used in real time for calculating the wear in the backup roll and in this manner take deci- sions for preventing finished product reworking or damage of equipments, which result in accidents caused by excessive wear in the backup rolls. 相似文献
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HU Yu GONG Dian-yao JIANG Zheng-yi XU Jian-zhong ZHANG Dian-hua LIU Xiang-hua 《钢铁研究学报(英文版)》2009,16(5)
Based on the influence coefficient method, the effect of entry strip crown on the shape of hot rolled strip was analyzed using the software of roll elastic deformation simulation. According to the practical condition of a domestic hot roiled strip plant, the unit strip crown change from the first stand to the last stand was calculated when the entry crown of hot strip varies. The calculated result shows that the entry strip crown does not significantly affect the target strip crown at the exit of the last finishing stand in respect to a fixed strip shape control reference (such as bending force). The calculation was analyzed, and the research is helpful in modeling strip shape setup and shape control. 相似文献