http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
항공장비용 환경제어시스템의 제어변수별 운전특성에 관한 실험적 연구
박형필(Hyungpil Park),강훈(Hoon Kang),김용찬(Yongchan Kim),지용남(Yongnam Chi),최희주(Heeju Choi),변영만(Youngman Byeon),김영진(Youngjin Kim),오광윤(Kwangyoon Oh) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Environmental control system is installed to dissipate the thermal load in avionic equipments which is mounted under aircraft. The operating characteristics of the system changes with the variations of control parameters. In this study, the environmental control system was designed and built by adopting vapor compressor cycle using R-124. The operating characteristics of this system was experimented varying control parameters, such as refrigerant charging amount, expansion device opening, compressor rotating speed, blower rotating speed. The effect of the control parameters on the environmental control system was analyzed and the optimum control method was suggested.
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.
금형 급속가열-냉각이 적용된 이생사출성형의 플래쉬 발생 예측
박형필(H. P. Park),차백순(B. S. Cha),이병옥(B. O. Rhee) 한국소성가공학회 2009 금형가공 심포지엄 Vol.2009 No.11
The mold rapid heating and cooling technology is applied to the thin-walled two color injection molding producing high-quality electronic products. In case of thin-walled two color injection molding, the flash is often generated when molten polymer flows into small gap at parting line in mold with high injection pressure or under unbalanced clamp force condition. In this study, we investigated the effect of processing conditions on flash generation using injection molding CAE. We found that the flashing could be caused by the structural imbalance of the moving plate in the clamping state. The predicted flash shape was compared with experimental result.