熱軋H型鋼控制冷卻過程換熱規(guī)律的研究
[Abstract]:The numerical simulation in the controlled cooling process of hot rolled H-section steel has made great progress after a long period of development, but there are still many complicated problems in theoretical research and industrial application: in the process of heating and cooling, There is a strong heat transfer between the workpiece surface and the medium, and the comprehensive heat transfer coefficient of the workpiece is greatly affected by the working conditions. The state of the workpiece and the cooling medium are different and the contact mode is different, even if the heat transfer coefficient of different surfaces of the same part will be different. How to accurately determine the surface heat transfer coefficient is of great significance to improve the accuracy of numerical simulation of the heating and cooling process of H-section steel and to control and guarantee the rolling quality of H-section steel. In this paper, the lumped parameter method and finite element Ansys simulation analysis are used to verify that the cylindrical Q235 probe accords with one-dimensional transient heat transfer, which ensures that it is consistent with the one-dimensional transient state of H-section steel, and then the cylindrical Q235 structural steel is used as the probe. The temperature curves of heating and three kinds of cooling methods (water cooling, air cooling, spray cooling) were collected. The real color paperless recorder and the instrument management software were used to obtain the data files of the near surface heat measurement. The experimental data are imported into Matlab, and the experimental data are fitted. Thirdly, the comprehensive heat transfer coefficient curves under heating and three cooling modes are obtained by using nonlinear estimation method and iterative programming with Matlab software. Finally, the finite element model of variable physical property and unsteady temperature field of heating and cooling process is established by using Ansys finite element software. The heat transfer coefficient is verified by the experimental data mentioned above. The model takes into account the influence of various factors, such as variable thermal properties, latent heat of phase transition and kinetic principle of phase transition. The temperature change and the stress field along the path are studied in some joints. Based on the experimental data, the variation law of temperature field and stress field of H-section steel is obtained. By adopting the new controlled cooling technology, the traditional profile production technology will be reformed. The research on the heat transfer law of the controlled cooling after H type rolling is the key problem to further improve the precision and level of numerical simulation of controlled cooling, and to the development of national economy and the rational utilization of resources. Have very realistic and far-reaching significance.
【學(xué)位授予單位】:遼寧科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG335.42
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