Rolling Parameters Analyze Strip Tail Deviation and Deformation in Finish Mill
| Autor: | Kang, Shu-Wei, 康書維 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 In the finish mill during hot rolling, tail pinch phenomenon is an serious problem under highly concern. Since the strip thickness is thin and the rolling speed is high in finish mill, if there is any asymmetrical strip profile or any wrong setting of mill parameters, it is easily to cause milling instability in finish mill and to increase the probability of tail pinch. Tail pinch phenomenon not only damages the steel strip but also damage the surface of the rolls. Furthermore the production line would be interrupted due to changing rolls and removing the damaged strip which would seriously reduce the yield rate and deteriorate the production efficiency. According to the empirical data collected during finish mill, the cause of tail pinch phenomenon may be due to asymmetric deformation of strip end to a certain side. The reason for strip deformation to one side may be due to asymmetrical strip profile or rolling mill assembly gap. This research mainly analyzes the effect of rolling parameter on the asymmetrical strip profile and the strip end during finish milling and try to final an effective mechanism to reduce the tail pinch probability. Finite element analysis was applied deformation to establish a finish mill and strip model to simulate the possible strip end deformation which was affected by rolling parameters. A regression from the result of simulation could deduce mathematical model to applied to the correction of strip end deformation. The accuracy of the mathematical models will be verified by comparing with simulation results. A verified mathematical model can be then used for the finish mill line. The mathematical model in combined with the finishing mill on site control system to establish a better program control system to suppress the tail pinch phenomenon. Using this system the finish mill rolling parameters can be more efficiently corrected and the strip end deformation can be corrected and the production efficiency and the yield rate of steel strip products can be improved. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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