Study on Rolling of a Double Thickness of the Sheet by DEFORM
| Autor: | Che-Yi Lin, 林哲毅 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 This study tries to produce a double thickness of the sheet by the one-pass rolling process. Compared to multi pass rolling, this method can reduce the production cost. The finite element software, DEFORM, can analyze the simple profile metal to understand how appearance parameters and process parameters impact the roll forming. The appearance parameters are the width of thickness reduction and the distance of thickness reduction; the process parameters are the varying speed ratio under the symmetrical roll, the roll diameter, the varying roll diameter ratio under the asymmetric roll, and the roll gap. The results of the process parameters analysis show that the setting of the width of thickness reduction and the distance of thickness reduction will impact the velocity distribution in the rolling direction during the roll forming process. The huge difference in velocity will contribute to the wavy transverse cross-section of the plate. From the analysis of the process parameters under the setting of symmetrical roll, the size of the roller would affect the thickness of the plate as well as the wave amplitude which caused when the plate gets into the mold, and the bending characters when the plate leaves the mold. The speed difference can make a slow speed mold a specific torque. Under the setting of asymmetric rolling, the distance between two rollers would affect the thickness of the finished plate and the bending characters when the plate leaves the mold. The size ratio of the roller would affect the mold’s radial load and torque load. The wave amplitude formed when the plate gets into the mold would be significantly reduced under the setting of asymmetric roller diameter. This study concludes that under the setting of simple profile metal, the asymmetric rolling is the best process setting. Comparing to the formation characteristics, the mold load, and the formation nature, it would be the second or the best choice. This study can provide a reference of application for making the different thickness of one-pass rolling. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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