摘要
20辊轧机辊系结构复杂,其板形控制策略灵活多变。板形控制策略的合理制定依赖于精确且稳定的板形预报模型。但由于模型耦合法中还存在内层辊间压力迭代环,计算速度仍有进一步提高的空间。为此,提出了一种新型20辊轧机板形预报的无迭代模型耦合法,在牺牲有限精度的前提下,消除了内层辊间压力迭代环,显著提高了计算速度。通过3个实例,对3种方法(传统方法、模型耦合法和无迭代模型耦合法)的收敛性、计算时间与计算精度进行了综合比较。结果表明,在收敛性方面,带材宽厚比越大,传统方法越难收敛,而模型耦合法与无迭代模型耦合法不存在收敛性问题;在计算精度方面,以传统方法计算板形值为准,无迭代模型耦合法计算的3个实例板形值的平均绝对误差(mean absolute error,E_(MA))不超过2.51 I,基本保持了传统方法的原有精度;在计算速度方面,传统方法计算时间最长,其次是模型耦合法,无迭代模型耦合法计算时间最短。无迭代模型耦合法计算速度约为模型耦合法的7倍约为传统方法的8627倍。
The roll system of a 20-high mill has a complex structure,and the flatness control strategy is flexible and changeable.The reasonable formulation of a flatness control strategy depends on an accurate and stable flatness pre⁃diction model.However,due to the model coupling method also existing the inter-roll pressure iteration loop in the inner layer,the calculation speed still has room for further improvement.Therefore,a new type no-iteration model coupling method for flatness prediction of 20-high mills was proposed,which eliminated the inner inter-roll pressure iteration loop and significantly improved the calculation speed at the expense of limited accuracy.A comprehensive comparison of the convergence,calculation time,and calculation accuracy of the three methods(traditional method,model coupling method,and no-iteration model coupling method)was carried out through three examples.The results show that in terms of convergence,the larger the strip width-to-thickness ratio is,the more difficult it is for the traditional method to converge,whereas the model coupling method and no-iteration model coupling method do not have convergence problems.In terms of calculation accuracy,based on the flatness value calculated by the tradi⁃tional method,the average absolute error(E_(MA))of the flatness value calculated by the no-iteration model coupling method for the three instances does not exceed 2.51 I,which basically maintains the original calculation accuracy of the traditional method.In terms of calculation time,the traditional method has the longest calculation time,followed by the model coupling method,and the no-iteration model coupling method has the shortest calculation time.The calculation speed of the no-iteration model coupling method is about 7 times that of the model coupling method,and the calculation speed of the no-iteration model coupling method is about 8627 times that of the traditional method.
作者
任寅杰
王东城
吕猷闯
杜京博
刘宏民
REN Yinjie;WANG Dongcheng;LÜYouchuang;DU Jingbo;LIU Hongmin(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China;National Key Laboratory of Metal Forming Technology and Heavy Equipment,Xi’an 710016,Shaanxi,China)
出处
《钢铁》
北大核心
2025年第9期113-121,共9页
Iron and Steel
基金
国家自然科学基金资助项目(U21A20118)
河北省自然科学基金面上基金资助项目(E2023203065)
金属成形技术与重型装备全国重点实验室(中国重型院)开放课题资助项目(S2208100.W04)。
关键词
20辊轧机
板形预报
无迭代
模型耦合法
传统方法
收敛性
计算精度
计算时间
20-high mills
flatness prediction
no-iteration
model coupling method
traditional method
conver⁃gence
calculation accuracy
calculation time
