著者

山崎 祐亮 北山 哲士 高野 昌宏 合葉 修司

出版者

公益社団法人 日本設計工学会

雑誌

設計工学 (ISSN:09192948)

巻号頁・発行日

pp.2017.2784, (Released:2018-06-27)

参考文献数

15

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In plastic injection molding (PIM), warpage should be minimized for high product quality whereas cycle time should also be minimized for high productivity. Process parameters such as melt temperature, packing pressure, and cooling time strongly affect both the product quality and the productivity, and it is important to determine the optimal process parameters. This paper proposes a method to determine the optimal process parameters for the warpage and the cycle time minimization. Variable packing pressure profile that the packing pressure varies during the packing phase is adopted. Three dimensional cooling channel is also used for the warpage and cycle time minimization. Numerical simulation in the PIM is so intensive that a sequential approximate optimization is used to identify the pareto-frontier. Based on the numerical result, the experiment using the PIM machine is carried out. Through the numerical and experimental result, it is confirmed that the proposed approach is valid to the warpage and the cycle time minimization.

著者

玉田 可南子 北山 哲士 高野 昌宏 合葉 修司

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.852, pp.17-00209-17-00209, 2017 (Released:2017-08-25)

参考文献数

17

被引用文献数

1

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In plastic injection molding (PIM), the process parameters such as melt temperature, mold temperature, injection time, and so on strongly affect the energy consumption as well as the product quality. It is preferable to produce plastic products with a small clamping force for the energy consumption. Weldlines, which are formed when two or more melt fronts meet, influence not only the strength of products but also the appearance, so it is preferable to reduce the weldlines as much as possible. In order to reduce the weldlines with the small clamping force, a simultaneous optimization of the process parameters in PIM is performed and the pareto-frontier is identified. The weldline temperature is maximized for the weldlines reduction, whereas the clamping force is minimized. The numerical simulation in PIM is so intensive that a sequential approximate optimization using radial basis function network is adopted. The difference between conformal and conventional cooling channel is also discussed. The numerical result shows that the trade-off between the weldline temperature and the clamping force is clarified and the effectiveness of conformal cooling channel is clarified.

著者

横山 眞樹 北山 哲士 高野 昌宏 合葉 修司

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.17-00067-17-00067, 2017 (Released:2017-06-25)

参考文献数

18

被引用文献数

1

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Process parameters in plastic injection molding (PIM) such as packing pressure, melt temperature and cooling time have a direct influence on the product quality and it is important to determine the optimal process parameters for the high product quality as well as the high productivity. This paper proposes a method to determine the optimal process parameters in the PIM for high product quality and high productivity. In particular, the variable packing pressure profile that the packing pressure varies through the packing phase is adopted as the advanced PIM. Warpage and cycle time are taken as the product quality and the productivity, respectively. Therefore, a multi-objective optimization of the process parameters using the variable packing pressure profile is performed. Numerical simulation in the PIM is so intensive that a sequential approximate optimization using radial basis function is adopted. It is found through the numerical result that the proposed packing pressure profile can improve both the warpage and the cycle time. Based on the numerical result, the experiment is also carried out. It is confirmed through the numerical and experimental result that the variable packing pressure profile is an effective approach for the warpage reduction and the short cycle time.