共查询到18条相似文献,搜索用时 125 毫秒
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在经典轧制理论和现代连铸理论相结合的基础上,推导出了铸轧力计算公式,并建立了一个非线性状态空间模型,描述双辊结晶器内的金属凝固和塑性变形,此模型可以作为双辊铸轧薄带钢过程铸轧力的实时在线控制模型。 相似文献
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在双辊铸轧过程中,铸轧力的控制是铸轧过程稳定进行和提高薄带质量的关键.为了控制铸轧力,必须建立铸轧力计算数学模型,本文采用了一种基于贝叶斯方法的前向神经网络训练算法以提高网络的泛化能力,在网络的目标函数中引入了表示网络结构复杂性的惩罚项,融入"奥克姆剪刀"理论,避免了网络训练的过拟合.将上述网络应用于铸轧过程的铸轧力计算,具有很高的计算精度,同时在收敛速度、稳定性和泛化能力方面都优于传统的BP神经网络. 相似文献
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基于大型有限元模拟软件MSC.Marc建立了连续铸轧过程的热-力耦合模型,应用材料流变本构模型和辊/板界面接触热导模型,对铝合金的连续铸轧过程进行了二维的直接热-力耦合数值模拟,分析了连续铸轧过程中辊套及板坯的温度场、应力场的分布规律,研究了不同的铸轧工艺下的板坯温度场、应力场变化的规律。研究发现:在铸轧过程中,辊套的温度分布、应力分布均存在所谓的"集肤效应",板坯在铸轧区内的应力场与板坯物性因素、几何因素及温度、铸轧工艺等有密切的联系,仿真的结果与大量的工业现象相符,在一定程度上可以为实际生产提供技术指导。 相似文献
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综合考虑辊套与铸轧板的弹塑性变形对温度场和应力场的影响,建立铝带坯双辊连续铸轧过程的二维动态热力耦合计算模型;为了建立铸轧过程复杂的边界条件和热接触条件,采用纯铝高温本构关系和接触热阻数值模型,用Fortran对MARC进行二次开发;采用更新的拉格朗日方法进行分析,得出铝带坯连续铸轧过程的温度场和应力场的分布;分析比较不同铸轧速度对铸轧板坯和铸轧辊温度场和应力场的影响。 相似文献
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The development of continuous casting technology of electrical steel was analyzed. The technologies and products characteristics of conventional continuous casting, thin slab continuous casting and rolling, middle thin slab continuous casting and rolling and twin-roll thin strip were compared. Conventional continuous casting technology was widely adopted in producing electrical steel; thin slab continuous casting and rolling and middle thin slab continuous casting and rolling technology industrialized electrical steel; and study of twin-roll thin strip casting technology was focused on fundamental experiments. 相似文献
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You Zhou Yi Mao Dongpo Xuan Tianliang Jiang Wenhao Fan Biji Zhu Cheng Zhou 《国际钢铁研究》2023,94(10):2200953
Twin-roll strip casting is a near-net-shape casting technology that can produce thin steel strips directly from molten steel. Stably controlling the molten steel level is regarded as an important issue to ensure strip quality and casting process stability. As the control of the molten steel level is a time-varying, nonlinear, and multidisturbance complex system, it is difficult to establish an accurate process model for designing a model-based controller. Top side-pouring twin-roll casting is a new kind of twin-roll strip casting technology. This study introduces the control system of the top side-pouring twin-roll casting process. A fuzzy logic controller (FLC) with its fuzzy rules optimized by particle swarm optimization (PSO) is developed to regulate the molten steel level. Simulation results show that the performance of the FLC can be improved while its fuzzy rules are optimized by PSO. The objective function of PSO has a great influence on the optimization of the fuzzy rules. The top side-pouring twin-roll casting experiments are carried out using the FLC with its fuzzy rules optimized by PSO; the results show that strip quality and casting process stability are guaranteed. 相似文献
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《Baosteel Technical Research》2019,13(3)
Twin-roll strip casting and rolling is a typical near-net-shape steel manufacturing process. The twin-roll strip casting and rolling of low-carbon steel strips has made a number of breakthroughs and achieved significant results during the past 20 years. Baosteel has been paying close attention to the development of this technology and set up a research and development project focused on its industrialization in 2001. The Ningbosteel-Baosteel strip casting industrialization demo project( NBS),which was launched in 2016,marks the strip-casting technology( registered as Baostrip) developed by Baosteel as having reached an advanced international level after 15 years of effort. This paper summarizes the results obtained in the industrialized demonstration plant and considers the future development of strip casting and rolling. 相似文献
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In the twin-roll strip casting process,hot cast strips can be broken or torn if the casting speed does not match the rolling speed.Usually,a certain length of hot steel strip is hung freely between the caster and rolling mill to deal with the effect of this speed difference.In this paper,the freely hanging hot steel strip is referred to as the free loop of hot steel strip.Accurately measuring and controlling the height of this free loop is the key factor in maintaining a stable casting operation.Several methods for measuring the loop height of a steel strip are discussed and a method for accurately measuring and controlling the free loop height of hot steel strip is presented.Based on the results of the casting loop quantity change curve,this control method is confirmed to be effective and able to meet the requirements of continuous casting strip production. 相似文献
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In this study,morphological and microstructural analyses were conducted on net-shaped microcracks appearing on the surface of low-carbon steel manufactured via twin-roll strip casting. The fractograph and microscale distribution of elements in the cracked region were also analyzed. Results revealed that the cracked surfaces were characterized by slight pits,along with inclusions composed of manganese and silicon oxide distributed along both the sides of the cracks. Fractograph analysis revealed that the crack and smooth dendrite surfaces were oxidized. These phenomena indicate that microcracks on the cast strip surface form at the hightemperature stage of the solidification process during twin-roll casting and rolling. Microcracks were present in each region with pits in the cast strip and extended along the dendrite interface because of the combined effects of phasechange stress,thermal stress,mechanical stress,and fractional crystallization during the solidification process. 相似文献
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采用拉格朗日随体坐标建立了铝双辊铸轧过程瞬态传热数学模型。模型考虑了金属凝固动力学条件和采用试验测定的辊/铝带坯界面接触换热系数边界条件,用有限差分方法对控制方程进行了数值求解,并由现场测试数据验证了传热数学模型的正确性。 相似文献
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