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DSI 성형을 이용한 금속/플라스틱 복합 부품 제조에 관한 연구
하석재,차백순,고영배,Ha, Seok-Jae,Cha, Baeg-Soon,Ko, Young-Bae 한국금형공학회 2020 한국금형공학회지 Vol.14 No.4
Various manufacturing technologies, including over-molding and insert-injection molding, are used to produce hybrid plastics and metals. However, there are disadvantages to these technologies, as they require several steps in manufacturing and are limited to what can be reasonably achieved within the complexities of part geometry. This study aims to determine a practical approach for producing metal/plastic hybrid components by combining plastic injection molding and metal die casting to create a new hybrid metal/plastic molding process. The integrated metal/plastic hybrid injection molding process developed in this study uses the proven method of multi-component technology as a basis to combine plastic injection molding with metal die casting into one integrated process. In this study, the electrical conductivity and ampacity were verified to qualify the new process for the production of parts used in electronic devices. The electrical conductivity was measured, contacting both sides of the test sample with constant pressure, and the resistivity was measured using a micro ohmmeter. Also, the specific conductivity was subsequently calculated from the resistivity and contact surface of the conductor path. The ampacity defines the maximum amount of current a conductive path can carry before sustaining immediate or progressive deterioration. The manufactured hybrid multi-components were loaded with increasing currents, while the temperature was recorded with an infrared camera. To compare the measured infrared images, an electro-thermal simulation was conducted using commercial CAE software to predict the maximum temperature of the power loaded parts. Overall, during the injection molding process, it was demonstrated that multifunctional parts can be produced for electric and electronic applications.
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.
패밀리금형에서의 수지 유변학적 특성에 따른 가변러너의 성능 분석
최권일,박형필,차백순,이병옥,구본흥,Choi, Kwon-Il,Park, Hyung-Pil,Cha, Baek-Soon,Lee, Byung-Ok,Gu, Bon-Heung 한국금형공학회 2008 한국금형공학회지 Vol.2 No.6
It is well known that the family-mold has an advantage to reduce the cost for production and mold. However, defects are frequently occurred by over packing the smaller volume cavity during molding, especially when the family-mold has a volumetric difference between two cavities. In this study, the cavity-filling imbalance was confirmed by the temperature and the pressure sensors, and a variable-runner system was developed for balancing the cavity-filling. Experiments of balancing the cavity filling was carried out in the family-mold with the variable-runner system, and balancing the cavity-filling was confirmed by changing the cross-sectional area of a runner in the variable-runner system with the temperature and pressure sensors. The influence of the injection speed to the balancing-capability of the variable-runner system was also examined in the experiment.
등방압 적용 Conformal Cooling Channel Core 금형기술에 대한 기초 연구
이성희(S.H. Lee),차백순(B.S. Cha),윤길상(G.S. Yoon),고영배(Y.B. Ko),박훈재(H.J. Park),최태훈(T.H. Choi),이근안(G.A. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
A basic research on isostatic technology for advancing the material property of direct metal tool ing core was performed in this study. The advantages of direct metal tool ing core are well known for the reduction of cycle time and the acquirement of high quality product in injection mold process. However there are some problems in density of structure, such as micro scale void. Therefore this research focused on the feasibility study for the application of isostatic process on mold making aspect. Direct tooled tensile specimen and inject ion mold core were prepared to invest i gat e the effect of isostatic process on dimensional change, hardness variation and tooling characteristics. It was shown that dimensional variation ratio was smaller than hardness variation ratio and there was no significant difference in machining result.
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.