中厚板轧制和轧后冷却过程离线模拟软件的开发

发布时间：2018-02-09 09:28

本文关键词： 中厚板轧制轧后冷却软件数学模型离线模拟　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

【摘要】：中厚板是支撑国家工业化建设的重要钢铁品种,是促进国民经济发展的重要钢铁材料,其生产水平和产品质量是国家钢铁工业发达程度的重要标志。随着经济的不断发展和市场竞争的愈加激烈,用户对中厚板产品的质量也提出了更高的要求。中厚板厂家只有采用新工艺和新方法,才能最大限度地降低产品生产成本、缩短产品开发周期、提高产品质量,为此,本文开发了中厚板轧制和轧后冷却过程的离线模拟软件。本软件可以使中厚板厂家反复进行实验、合理优化工艺、拓展产品类型,为高产量、高性能、高质量产品的生产和研发提供科学的方法和可靠的途径。本文在离线模拟软件的开发过程中,以中厚板轧制和轧后冷却的基本理论和工艺过程为依据,对轧制过程中的力能参数和轧后冷却的温降过程进行了分析和研究并建立了相应的数学模型。其中,轧制力能参数模型的建立以轧制温度、变形抗力、平均单位压力和宽展模型为基础,轧后冷却的温降模型是在传热学的基础上通过显式格式的有限差分法建立起来的。此外,本文还推导了平均变形速度和变形程度以及物体导热的微分方程,对导热系数和比热容进行了拟合处理,按轧制力和功率两种模式优化了轧制规程,设计了轧后直接冷却和分段冷却两种冷却方式,使本文的数学模型更加精确、软件的模拟功能更加丰富。根据本文建立的轧制和轧后冷却过程的数学模型,运用C++语言编写了力能参数模型和温降模型,完成软件内核运算程序的开发;根据工艺流程顺序、数据传输形式和结果显示方法,运用VB语言进行控件和窗体的设计,完成软件人机交互界面的开发。通过运行本软件对中厚板轧制和轧后冷却过程进行离线模拟,将轧制力能参数和轧后冷却温降的模拟结果与现场的实测结果进行比对和分析,验证了本软件的离线模拟精度能够满足实际生产的需要。基于本软件对轧制和轧后冷却过程的离线模拟结果,以轧制过程中轧制温度、轧制速度和变形程度对力能参数的影响为研究内容进行分析,得出轧制力能参数随轧制温度的升高而降低,随轧制速度和变形程度的增加而增大;以轧后冷却过程中钢板厚度、运行速度和冷却水流量对冷却效果的影响为研究内容进行分析,得出轧后终冷温度随钢板厚度和运行速度的增加而升高,随冷却水流量的增加而降低。
[Abstract]:Medium and heavy plate is an important kind of iron and steel to support the industrialization of the country and an important steel material to promote the development of the national economy. The level of production and product quality is an important symbol of the degree of development of the country's iron and steel industry. With the continuous development of the economy and the increasingly fierce competition in the market, Users have also put forward higher requirements for the quality of medium and heavy plate products. Only by adopting new processes and methods can manufacturers of medium and heavy plates minimize production costs, shorten product development cycles, and improve product quality. In this paper, an off-line simulation software for plate rolling and cooling process after rolling is developed. The software can make medium and heavy plate manufacturers to carry out experiments repeatedly, optimize the process reasonably, expand the product types, and make it high yield and high performance. The production and development of high quality products provide a scientific method and a reliable way. In the development of off-line simulation software, the basic theory and process of rolling and cooling after rolling and rolling of medium and thick plate are taken as the basis of this paper. The force and energy parameters in rolling process and the temperature drop process of cooling after rolling are analyzed and studied, and the corresponding mathematical models are established. Based on the average unit pressure and width model, the temperature drop model of post-rolling cooling is established on the basis of heat transfer through the explicit finite difference method. The differential equations of average deformation velocity, deformation degree and heat conduction of objects are also derived. The heat conductivity and specific heat capacity are fitted and the rolling schedule is optimized according to the two modes of rolling force and power. Two cooling methods, direct cooling and piecewise cooling after rolling, are designed, which make the mathematical model of this paper more accurate and the simulation function of software more abundant. According to the mathematical model of rolling and cooling process after rolling, The C language is used to compile the force and energy parameter model and temperature drop model to complete the development of the software kernel operation program, according to the process sequence, the data transmission form and the result display method, the VB language is used to design the control and form. The software man-machine interface is developed. The off-line simulation of rolling and post-rolling cooling process of medium and thick plate is carried out by running the software. The simulation results of rolling force and energy parameters and cooling temperature drop after rolling are compared and analyzed with the measured results in the field. The off-line simulation accuracy of the software is verified to meet the needs of actual production. Based on the off-line simulation results of rolling and post-rolling cooling process, the rolling temperature during rolling process is obtained. The effects of rolling speed and deformation degree on force and energy parameters are analyzed. The results show that the rolling force and energy parameters decrease with the increase of rolling temperature and increase with the increase of rolling speed and deformation degree. The effect of operation speed and cooling water flow rate on cooling effect is analyzed. It is concluded that the final cooling temperature after rolling increases with the increase of steel plate thickness and operation speed, and decreases with the increase of cooling water flow.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG335.52

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