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Journal of Reinforced Plastics and Composites
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Optimum Design of Gas-assisted Injection Molding

Chun-Sheng Chen

Department of Mechanical Engineering, Lunghwa Science and Technology University, Guai-Shan, Taiwan, 33327 cschen{at}mail.lhu.edu.tw

Wei-Seng Cheng

Tzung-Shinug Wang

Department of Mechanical Engineering, Lunghwa Science and Technology University, Guai-Shan, Taiwan, 33327

Rean-Der Chien

Department of Mechanical Engineering, Nan Ya Institute of Technology, Chung-Li, Taiwan, 32034

Finite element method and Taguchi method are used to simulate the process of gasassisted injection molding (GAIM) to find out the optimal design condition of manufacturing a polystyrene product. In this study, the experimental design of Taguchi method is used to determine the process condition of the GAIM, while a software, M-Flow, is used in simulating the injection process. Eight parameters are discussed including material and process parameters for gas-assisted injection. By using the Taguchi method and analysis of variance, ANOVA, four parameters are found to have a great influence on the GAIM product. It is found that a slower gas injection speed, higher melt temperature, higher gas pressure, and longer gas packing time would yield lesser warpage.

Key Words: Taguchi method • gas-assisted injection molding • analysis of variance

This version was published on October 1, 2005

Journal of Reinforced Plastics and Composites, Vol. 24, No. 15, 1577-1586 (2005)
DOI: 10.1177/0731684405050395
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