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노건철,장민규,제덕근,최윤식,정영득,Noh, Keon-Cheol,Jang, Min-Kyu,Je, Deok-Keun,Choi, Yoon-Sik,Jeong, Yeong-Deuk 한국금형공학회 2014 한국금형공학회지 Vol.8 No.1
Plastic products are producted more than 70% of total processes by the injection molding. The injection molding process has 4 processes such as filling, packing, cooling and ejecting. It spends most of times in the cooling process. Therefore, it is important to control the mold temperature in producing plastic products. The time and system of cooling affect the product's quality and productivity. Especially, cooling time has about 60% of total injection cycle time. Therefore, we can improve a productivity by shortening cooling time. This study shows comparative study about cooling efficiency of spiral channel and baffle and observed the variation of time to freeze of molding As the result of CAE experiments, cooling rate by spiral channel had faster than baffle and as freeze time was decreased. Results of this study will be used widely to design for cooling system of injection mold.
노건철,이규호,장민규,정영득,Noh, Keon-Cheol,Lee, Gyu-Ho,Jang, Min-Kyu,Jeong, Yeong-Deug 한국금형공학회 2015 한국금형공학회지 Vol.9 No.1
The injection molding is used in more than 70% of total production of plastic products. Weld line in injection molded part is one of the defects in injection molding process. Weld line deteriorates not only appearance quality but also mechanical property. In this study, tensile strength about material such as ABS, PP, PA and PS was tested. as the results, the first result appears that weld's strength retention ratio's are 0.90, 0.84, 0.85, 0.76 and the second result apeears that weld depth decrease as processing temperature increased.
이규호,최우수,노건철,정영득,Lee, Gyu-Ho,Choi, Woo-Su,Noh, Keon-Cheol,Jeong, Yeong-Deug 한국금형공학회 2014 한국금형공학회지 Vol.8 No.1
The injection molding is used in more than 70% of total production of plastic products. Weld line in injection molded part is one of the defects in injection molding process. Weld line deteriorates not only appearance quality but also mechanical property. In this study weld quality has been examined according to the injection processing temperature, materials and mold designs. We selected four different materials such as PA, PP, ABS and PS as experimental materials. Weld quality increased as injection processing temperature increases. It was more dependent on materials flow ability. As a result, weld quality incase of rectangular core is better than circular core.