共查询到16条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
6.
7.
研究了莱钢1 500 mm热轧带钢生产线控冷系统存在的问题.对层流冷却设备和控制模型进行优化,改善了带钢表面存在斑点、花纹颜色不均等质量问题;提高了模型设定的准确性和灵活性,为新产品的开发奠定了坚实基础. 相似文献
8.
为了提高莱钢1500mm热连轧卷取温度的控制精度,对原基础自动化控制系统进行改造,增加了带Smith预估器的反馈控制和轧机抛钢后的冷却水前馈控制;同时增加了过程自动化控制系统,包括预设定计算、修正设定计算和自学习计算模块。系统改造后,带钢卷取温度控制不稳定的现象基本消除,实现了带钢的冷却模式、卷取温度和冷却速率的精确控制,提高了带钢的质量。 相似文献
9.
10.
11.
�¼��� ������ ��ƽ�� 《钢铁研究学报》2013,25(10):14-19
In order to solve the problems of time-consuming and intense vibration during the calculation process of inverse heat conducting problem (IHCP) with conjugate gradient method (CGM), a non-iterative model was developed based on finite element method (FEM) and related program code was compiled with Fortran. This non-iterative method was then applied to IHCP of laminar cooling process of hot rolled steel plate to calculate the convective heat transfer coefficient in the boundary. Through comparison of the convective heat transfer coefficient obtained by both CGM and the non-iterative method, the results were shown to be consistent with each method. Furthermore, the computing result of the non-iterative method were more stable, and had an obviously faster speed, which eventually cut down the whole computing by 76%. The new method could retain high sparsity of the matrix, which is more concise than the exiting non-iterative method. Besides, the new non-iterative method could also be an efficient way to calculate the heat flux and wall temperature at the same time, which made it possible for real-time output of boundary conditions during laminar cooling process of hot rolled steel plate. 相似文献
12.
T A Dean 《钢铁研究学报(英文版)》2010,17(10):28-32
In the hot rolling processes, it always uses the laminar cooling system to control the cooling of plate and get the microstructure of different constitution. To investigate the effect of temperature variation due to the cooling pattern, rolling speed and thickness of plate on the microstructure evolution, a thermal-mechanical coupled FE model has been established. A set of constitutive equations of phase transformation is implemented into the commercial FE solver MARC through the user defined subroutine CRPLAW, and the temperature field is calculated by another user defined subroutine FILM. The effect of cooling pattern, rolling speed and thickness of plate on the temperature variation is numerically studied. Furthermore, the effect of temperature variation on the evolution of each phase transformation is investigated for various cooling pattern. 相似文献
13.
The use of computer simulation techniques in the control system design of the laminar cooling process in a hot mill can significantly reduce the development cost while ensuring maximum production safety. The case-based modelling strategy that the authors proposed was implemented in a software package. The functional structure of the software package was discussed in detail. The interfaces and functions of the software package were introduced. The results of industrial experiments can be directly visualized in the software package, allowing accurate and instant comparison of the model predictions with real measurements. The software package provides the simulation platform for research into advanced modelling and control strategies of the laminar cooling process in a hot rolling mill. 相似文献
14.
建立了热轧带钢层流冷却过程中温度场的三维有限元模型,对3 mm厚带钢轧后冷却过程带钢温度场进行模拟计算,得出卷取温度比现场测量值低9.5 ℃,相对误差为1.42%,验证了模型和假设的合理性。研究了上喷嘴直径对带钢温度的影响,带钢上表面宽度方向上存在2种不同的冷却区域:位于喷嘴正下方层流冷却过程中交替经过冲击区和平流区的区域和位于两喷嘴之间层流冷却过程中只经过平流区的区域,这造成带钢宽度方向上温度分布不均匀。计算结果表明,喷水量保持不变的情况下,存在一个最佳喷嘴直径,使带钢宽度方向上温度分布更均匀。喷水速度保持不变,增加喷嘴的直径有利于带钢宽度上方温度均匀,但增加了喷水量,降低了带钢的卷取温度。 相似文献
15.