Study on the Flowing Balances Analysis of the Multi-Cavity Modulus Runner System
| Autor: | Cheng, Chao-Han, 鄭釗瀚 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Injection molding processing using multi-cavity molding is necessary for providing the advantages of the low cost and mass production. The higher plastic shear-rate around the runner boundaries is an important factor for leading the asymmetric temperature distribution in the cross-section of the runner. The flowing imbalances caused some variations in the runner system of the multi-cavity mold, and these variations will significantly limit the benefit of a multi-cavity mold. Hence, the final parts with the warpage, shrinkage, short-shot, and poor externals will reduce the competitive advantages in some inappropriate. In this research, the radial runner system is used to discuss the angular effect of the runner flowing, and the authors try to utilize the flowing balances concepts to analyze the radial runner system of the injection molding. In the radial runner system, the high shear-rate and runner angle are two major factors to cause the flowing imbalances. The first solution is to insert the designated balance device into the radial runner for improving the flowing and shear effects. The second solution is to consider and design the angle between the main runner and secondary runner for improving the runner angle effects. The results show the above mentioned methods can improve the balanced performance of the multi-cavity injection molding. Furthermore, the authors try to use the mold flow analysis with Taguchi Methods to explore the imbalanced flowing phenomenon. To improve the flowing imbalances during injection molding processing, and the mold designation techniques and Taguchi Methods are employed to solve the problems of the parameters optimization. The results show the Taguchi method combined with ANOM method can be used to determine the importance of controlling factors and to obtain the optimal processing parameters when optimizing a quality characteristic in the injection molding simulation. The influence of all factors has been identified and believed can be a key solution in helping mold designers in determining optimum process parameters. The optimum parameters obtained has been verified by confirmed simulation experiment, and the balance performance can achieve to 100%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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