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Injection Molding Analysis of Map Pocket with a Speaker Grill Using Shell Element
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 Title & Authors
Injection Molding Analysis of Map Pocket with a Speaker Grill Using Shell Element
Kim, Hong-Seok; Jo, Myeong-Sang; Son, Jung-Sik; Seo, Tae-Su; Kim, Tae-Ung;
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 Abstract
In order to reduce the time and cost for assembly, automobile speaker grills have been injection molded with door trims or map pockets in one piece recently. However, several defects such as short shots or air traps can easily occur due to the decreased fluidity of the melting polymer according to the excessive heat transfer to the mold. Therefore, it is necessary to optimize the resin feed system and predict possible defects by CAE analysis. However it is not possible to obtain exact analysis results for the speaker grill by using general shell elements since the heat transfer in the thickness direction which is the dominant factor of the filling stage can not be considered. Therefore, there have been several efforts to simulate the injection molding nature of the speaker grill by using shell elements with an effective thickness which is smaller than the actual thickness of the part. Two empirical values have been recommended for the effective thickness in real practice. One is 50∼70% of the thickness of the speaker grill and another is the gap distance between the adjacent holes. In this paper, CAE analyses of a map pocket with a speaker grill were conducted using shell elements with both of these recommended effective thicknesses, and the predicted flow fronts were compared with the findings from injection molding experiments. The commercial code MOLDFLOW was used for injection molding analysis and an 850 ton injection molding machine was used for experiments.
 Keywords
Speaker Grill;Map Pocket;Injection Molding Analysis;Shell Element;MOLDFLOW;
 Language
Korean
 Cited by
 References
1.
한경희, 임용택, 1997, '압축성을 고려한 사출성형 충전과정에 관한 연구,' 대한기계학회논문집(A), 제21권, 제5호, pp. 735-747

2.
임원길, 김영일, 설권, 1996, '사출성형의 게이트 위치 최적화,' 한국정밀공학회 96년도 춘계학술대회논문집, pp. 787-791

3.
Chan, M., 1997, 'Comparison of Shrikage Measurements and MOLDFLOW Simulation of a Plastic Automotive Instrument Cluster,' The 9th International Pacific Conference on Automotive Engineering, pp. 663-666

4.
Yeung, V. W. S. and Lau, K. H., 1997, 'Injection Molding, C-MOLD CAE Package, Process Parameter Design and Quality Function Deployment: A Case Study of Intelligent Material Processing,' J. Mater. Proc. Technol., Vol. 63, pp. 481-487 crossref(new window)

5.
Hetu, J. F., Gao, D. M., Garcia-Rejon, A. and Salloum, G., 1996, '3D Finite Element Method for the Simulation of the Filling Stage in Injection Moulding,' ANTEC96, pp. 703-707

6.
허영무, 1994, '자동차용 플라스틱 스피커 그릴의 재료 대체에 관한 연구,' Moldflow Korea User Symposium

7.
이효성, 1997, '자동차용 Doortrim FRT Part의 사출성형해석에 관하여,' Moldflow Korea User Symposium

8.
Kennedy, P., 1993, Flow Analysis Reference Manual, Moldflow Pty. Ltd., Australia