共查询到19条相似文献,搜索用时 511 毫秒
1.
2.
3.
4.
5.
6.
针对双辊铸轧过程中凝固终点位置这一关键参数,基于贝叶斯方法的神经网络和理论模型,根据经验模型及熔池断面几何关系建立凝固终点位置数学模型.在化学成分和工艺约束已知的条件下,采用粒子群优化算法针对凝固终点位置这一铸轧过程中的关键因素进行相应的工艺参数的优化计算.铸轧实验结果验证了优化结果的可行性,从而为提高双辊铸轧板形和板厚的控制精度,改善铸带表面质量提供可能. 相似文献
7.
8.
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
9.
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
10.
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
11.
12.
13.
《Baosteel Technical Research》2010,(Z1):91
This article is try to explain or analyze the key technologies of controlling the surface quality of low carbon steel as cast strip through investigation of interface heat transfer between solidified shell and liquid steel.The one of the key technologies of controlling surface quality of low carbon steel as cast strip is through the casting roll surface texture in order to achieve the homogeneous solidification on the casting roll.Another is through forming a thin film on the casting roll surface in order to achieve a balance between rapid solidification and homogeneous solidification.This film formed between the twin roll and the molten steel can be controlled by adjusting the chemical composition and inclusion in liquid steel through controlling the amount of all[O]and free[O]. 相似文献
14.
Two-dimensional model for twin-roll continuous casting 总被引:11,自引:0,他引:11
T. Saitoh H. Hojo H. Yaguchi C. G. Kang 《Metallurgical and Materials Transactions B》1989,20(3):381-390
A numerical algorithm for the two-dimensional solidification problem in the twin-roll continuous casting system is presented
in this paper. Attention is focused on the elucidation of heat transfer and flow characteristics in both the liquid and the
solid phases. The present mathematical model can be applied to general full Navier-Stokes and energy equations, thereby covering
the wide range of twin-roll casting conditions. The boundary fixing method (BFM) is adopted to handle the moving boundary,
and the resultant transformed governing equations for the solid and liquid regions are solved separately by using a usual
explicit-type finite difference method. In this paper, a general numerical methodology is presented, and the quantitative
relationships between the important control parameters in continuous casting of twin-roll type (such as the roll speed, the
roll gap, the initial temperature of molten materials, the material properties, the solidification profile, and the endpoint
of solidification) are clarified in detail. The present numerical results have been compared with experimental results obtained
separately to check the validity of the proposed method. 相似文献
15.
16.
17.
18.
A three‐dimensional mathematical model has been developed to simulate turbulent fluid flow, heat transfer and solidification in the pool of a twin‐roll strip caster. A Darcy‐porosity approach was used to study the fluid flow within the mushy solidification zone in the pool. The effect of the heat transfer coefficient and permeability constant on the flow and solidification was also predicted. It was shown that an even flow and temperature distribution of the pool can be obtained by using a suitable feeding system. The heat transfer between the rolls and the solidifying metal has a big influence on the location of the solidification end point. The permeability of the mushy zone is a key factor which affects the flow and solidification in the twin‐roll strip casting process. 相似文献