Design and Analysis of Stamping Process for a Cylindrical Part
| Autor: | Chi-Ting Lai, 賴麒霆 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Many studies have been proposed in drawing process. The finite element method can achieve a certain reliability for the drawing process simulation and prediction. The research applied finite element analysis software (PAM-STAMP), along with manufacturer''s experience, to analyze the stamping production process for cylindrical component, as well as improving some defect of cracks due to lessening in thickness from repetitive sheet molding. And, with taguchi method, die design was optimized to reduce number of repetitive molding and other machining processes. The effect of blankholder force and its load curve on the product formability would also be investigated. Result showed the application of drawing process would require 7 steps to finalize the forming of cylindrical component, while the combined machining process of drawing and ironing could reduce it to 5 steps. The friction coefficient of sheet and die had less impact on the thickness of product with low drawing ratio, but varied significantly for higher drawing ratio product. By taguchi method to optimize the drawing process, it could increase the minimum and reduce the maximum for the optimal product thickness to decrease the load. As for the blankholder spring force of different load curves, even though they might exhibit the same maximum loading force, the sheet under the same stamping process might still develop variation during the molding process, resulting in different product thickness. Part of stamping and bending, the convex forming process would result in accumulation of material at the bend, but could reduce chance of cracks due to excessive sheet drawing, while the concave forming process resulted in the opposite. The springback analysis showed that the concave forming process had the smallest springback angle. From the actual measurement and analysis comparison, the maximum error in product thickness was 9.69%, and the minimum was 4.11%. It proved the plausibility and reliability of using analytic software for the stamping procedure, and it could help to understand the forming process, stress, strain, forming limit and forming load of a forming stamped component, in order to effectively predict and even prevent defect formation, to further improve the productivity. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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