The Experts below are selected from a list of 54033 Experts worldwide ranked by ideXlab platform
G H Su - One of the best experts on this subject based on the ideXlab platform.
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experimental and theoretical study on single phase natural circulation flow and heat transfer under rolling motion condition
Applied Thermal Engineering, 2009Co-Authors: G H SuAbstract:Experimental and theoretical studies of single-phase natural circulation flow and heat transfer under a rolling motion condition are performed. Experiments with and without rolling motions are conducted so the effects of rolling motion on natural circulation flow and heat transfer are obtained. The experimental results show the additional inertia caused by rolling motion easily causes the natural circulation flow to fluctuate. The average mass flow rate of natural circulation decreases with increases in rolling amplitude and frequency. Rolling motion enhances the heat transfer, and the heat transfer coefficient of natural circulation flow increases with the rolling amplitude and frequency. An empirical equation for the heat transfer coefficient under rolling motion is achieved, and a mathematical model is also developed to calculate the natural circulation flow under a rolling motion condition. The calculated results agree well with experimental data. Effects of the rolling motion on natural circulation flow are analyzed using the model. The increase in the flow resistance coefficient is the main reason why the natural circulation capacity decreases under a rolling motion condition.
Libo Pan - One of the best experts on this subject based on the ideXlab platform.
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research on gripping conditions in profile ring rolling of raceway groove
Journal of Materials Processing Technology, 2009Co-Authors: Dongsheng Qian, Lin Hua, Libo PanAbstract:Ring gripping means that under the pressure of roll and friction, ring grips the rolling gap and produces rotating rolling motion, thus ring thickness receives equal rolling and the outer diameter expands equally, and this is a sufficient condition for ring rolling forming. In this paper, gripping course in profile ring rolling of raceway groove is analyzed based on ring rolling principle and static theory. The gripping mechanical model for profile ring rolling of raceway groove is established, and gripping conditions are researched according to the geometrical relationship in rolling. The results indicate that ring could be ensured to continuously grip the gap in rolling by controlling feed per revolution and preventing it from exceeding the maximum feed per revolution allowed by ring gripping. Furthermore, influencing factors of gripping conditions are analyzed. At last, the experiments and the FE simulation for profile ring rolling of raceway groove are performed to testify the validity of gripping conditions. Both the experimental and simulation results show that when feed satisfies gripping conditions, ring can continuously grip the gap and be formed by rolling. Otherwise, ring cannot grip the gap and is squashed between the rolls. The results of this research provide a theoretical basis for design of technological parameters of profile ring rolling of raceway groove.
Dongsheng Qian - One of the best experts on this subject based on the ideXlab platform.
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effect of rolling ratio on groove section profile ring rolling
Journal of Mechanical Science and Technology, 2010Co-Authors: Yumin Zhao, Dongsheng QianAbstract:Ring rolling is an advanced plastic forming technique which is used to manufacture precise seamless rings. Rolling ratio is regarded as a decisive parameter for the ring rolling process because it decides the blank dimension, reflects the ring deformation degree and influences the forming results. However, its importance for the ring rolling process is always neglected. In this paper, the effect of rolling ratio on the groove-section profile ring rolling is firstly investigated. The relationships between rolling ratio and blank dimension, rolling ratio and ring deformation degree are theoretically studied and a theoretical value range of rolling ratio is proposed. Then, with FE simulation, the influences of rolling ratio on the forming results are revealed. Based on comparison and experimental verification, a reasonable value range of rolling ratio is determined.
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research on gripping conditions in profile ring rolling of raceway groove
Journal of Materials Processing Technology, 2009Co-Authors: Dongsheng Qian, Lin Hua, Libo PanAbstract:Ring gripping means that under the pressure of roll and friction, ring grips the rolling gap and produces rotating rolling motion, thus ring thickness receives equal rolling and the outer diameter expands equally, and this is a sufficient condition for ring rolling forming. In this paper, gripping course in profile ring rolling of raceway groove is analyzed based on ring rolling principle and static theory. The gripping mechanical model for profile ring rolling of raceway groove is established, and gripping conditions are researched according to the geometrical relationship in rolling. The results indicate that ring could be ensured to continuously grip the gap in rolling by controlling feed per revolution and preventing it from exceeding the maximum feed per revolution allowed by ring gripping. Furthermore, influencing factors of gripping conditions are analyzed. At last, the experiments and the FE simulation for profile ring rolling of raceway groove are performed to testify the validity of gripping conditions. Both the experimental and simulation results show that when feed satisfies gripping conditions, ring can continuously grip the gap and be formed by rolling. Otherwise, ring cannot grip the gap and is squashed between the rolls. The results of this research provide a theoretical basis for design of technological parameters of profile ring rolling of raceway groove.
Xiang Yan - One of the best experts on this subject based on the ideXlab platform.
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Rolling Force Prediction System Based on Hot Rolling Simulation Platform
Computer Simulation, 2014Co-Authors: Xiang YanAbstract:In order to solve the problems of large security risk,rolling equipments limited and steel material wasted in practical hot rolling training,this paper used 3D visualization technology,database technology and virtual instrument technology to simulate hot rolling process,this paper proposed a solution for hot rolling simulation platform of merging two-dimensional virtual instrument simulation technology and three- dimensional virtual reality simulation technology.Due to the current simulation systems have less hot rolling force prediction ability,the rolling passes can not be best allocated.To solve the problem,we used the mathematical models to calculate the rolling force,and system achieved the rolling force prediction capabilities.The result shows that the simulation platform realizes the hot rolling process simulation,and calculates the rolling force prediction which is consistent with actual value.
Zhengyi Jiang - One of the best experts on this subject based on the ideXlab platform.
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Analysis of rolling force model in cold rolling mill
Revue de Métallurgie, 2009Co-Authors: Zhengyi JiangAbstract:A rolling force model of continuous cold rolling mill based on elastic and plastic mechanics was developed and successfully applied in the control system of a 1420 mm cold rolling mill in Baosteel. Considering simplicity and practicability of calculation, stress of elastic zone and plastic zone during the cold rolling process was calculated and analyzed by incorporated simple finite element method and recursive calculating method. Compared with the measured rolling force, the results of the rolling force model are beyond 96.5%. A method for optimizing rolling force by improving reduction, dimension, coefficient of friction, deformation and tension is put forward.
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Asymmetric Cold Rolling of Thin Strip with Roll Edge Kiss
2007 2nd IEEE Conference on Industrial Electronics and Applications, 2007Co-Authors: Zhengyi Jiang, Dongbin Wei, Hongtao Zhu, Anh Kiet TieuAbstract:Asymmetric rolling can reduce the thickness of rolled strip and rolling load significantly. In this paper, the asymmetric cold rolling of thin strip with roll edge kiss was analysed theoretically and the rolling pressure, intermediate force between the work roll and backup roll, the work roll edge kiss force, the strip profile after rolling are obtained for this special asymmetric rolling. The rolling pressure, intermediate force, roll edge kiss force and the strip profile are compared for various roll speed ratios, reduction and friction coefficients. Simulation result shows that the roll speed ratio and reduction have a significant influence on the profile of rolled strip, and the calculated rolling forces are consistent with the measured values. The effect of friction in the roll bite on mechanics of the asymmetric cold rolling of thin strip with roll edge kiss is also discussed.
