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균일 냉각을 고려한 Thick-Wall 형상의 플라스틱 렌즈 쾌속 금형 제작
박형필,차백순,이상용,최재혁,이병옥,Park, Hyung-Pil,Cha, Baeg-soon,Lee, Sang-Yong,Choi, Jae-Hyuk,Lee, Byung-Ok 한국금형공학회 2007 한국금형공학회지 Vol.1 No.1
In the optical application demand for high quality lens is increasing. Plastics lenses are demanded more than glass lenses for large size lenses as well as micro-size lenses. It is difficult to apply typical straight cooling channels of injection mold to lens molding due to its non-uniform temperature distribution. In this study, we manufactured molds for plastic lenses with the conventional cooling channels and conformal cooling channels produced by the DMLS process. We evaluated cooling performance for the 2 molds by injection molding experiment. Also, uniformity of the temperature distribution was tested by infrared camera and temperature monitoring. We confirmed that the cooling performance and temperature uniformity with the conformal cooling channels is much improved from the ones with the conventional. The cooling time with the conformal cooling channels was reduced 30% compared with the conventional cooling channels.
물 사출성형의 잔류 벽두께에서 발생하는 기포 형성에 관한 연구
박형필(H. P. Park),김장환(J. H. Kim),최순호(S. H. Choi),차백순(B. S. Cha),김옥래(O. R. Kim),김동한(D. H. Kim),이병옥(B. O. Rhee) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
This report was to study the fluid injection molding using both water and silicone oil. The effect of thermal properties was studied in terms of their influence on void formation. We were conducts heat transfer analysis and injection molding simulation for water and silicone oil. The temperature distribution of the polymeric material during the cooling process was analyzed. And the different specific volume for thickness effect voids formation. In experiment, the residual wall thickness in curved sections was thick around outer wall and around inner wall. And silicone oil was able to get the results of the void does not occur.
자동차용 Band Cable의 유동성 향상에 관한 연구
박형필(H. P. Park),차백순(B. S. Cha),최영섭(Y. S. Choi),최현국(H. K. Choi) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Recently various types of rapid mold heating/cooling technology have been developed in order to improve surface quality of products and flow ability of polymer. In this study, injection molding CAE for rapid mold heating and cooling was performed to analyze molding characteristics of the automobile band-cable. The effects of the rapid mold heating and cooling technology on the molding characteristics and pressure distribution were compared with conventional injection molding. Finally, we evaluated component technologies such as rapid mold heating and cooling system, mold materials, vacuum system through experiments to solve molding problems.