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박판 Insert 사출성형시 Insert 변형 특성에 관한 기초 연구
정우철,신광호,허영무,윤길상,이정원,Jung, Woo-Chul,Shin, Gwang-Ho,Heo, Young-Moo,Yoon, Gil-Sang,Lee, Jeong-Won 한국금형공학회 2008 한국금형공학회지 Vol.2 No.5
Recently, ultra precision and light-weight micro products are needed in various industries. Injection molding products with metal insert material is often satisfied with light-weight and precision simultaneously. The researches on macro-size insert deformation have been performed but, a research on micro-size insert is meager. In this paper, the injection molding product with $300{\mu}m$ thin foil insert is designed and insert injection molding process is performed. Finally, the deformation of thin foil insert is analyzed according to insert feature and gate length.
플라즈마 전해산화법에 의해 형성된 알루미늄 합금의 양극산화피막 내마모 특성에 관한 연구
정우철,진연호,최진주,양재교,Jung, Woo-Chul,Jin, Yun-Ho,Choi, Jin-Ju,Yang, Jae-Kyo 한국표면공학회 2018 한국표면공학회지 Vol.51 No.6
In this study, plasma electrolytic oxidation (PEO) method was used to from anodic oxide films on Al alloy and their resistance and morphological characteristics were investigated as a function of film formation voltage and treatment time. Cross-sectional morphology and composition of the PEO films were analyzed by SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive Spectroscopy). The PEO films showed increased surface roughness and thickness with of film formation voltage and treatment time. The wear resistance was found to be the best for the PEO film formed for 5 min at 500V which is attributed to be denser structure relatively and lower surface roughness.
정우철,노원종,신은호,김도식,김형섭,홍주형,Jung, Woo-Chul,Noh, Won-Jong,Shin, Eun-Ho,Kim, Do-Sik,Kim, Hyung-Sup,Hong, Joo-Hyung 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.5
The failure modes and mechanisms of the interior parts of automobiles by cosmetics were studied under accelerated failing conditions of an actual working environment. The covering films for the interior parts were doped with three types of sunblocks and their ingredients. The failure of the doped films was accelerated by increasing the test temperature. The typical failure modes observed in the study were the swelling and cracking of the film's surface by the decomposition and the micro-structural changes of the films. This study can help the automobile company to design a plastic interior covering film for better reliability.
정우철,허영무,신광호,윤길상,Jung, Woo-Chul,Heo, Young-Moo,Shin, Kwang-Ho,Yoon, Gil-Sang 한국금형공학회 2007 한국금형공학회지 Vol.1 No.1
In recent, the demand of high-productivity injection mold increases because of the growth of international packaging market. The increase of productivity leads to the large-sized injection molding machine and peripheral devices. For solving this problem, the stack mold which is based on the existing machine and device is studied in advanced countries actively. In this study, as the preliminary research of stack mold development, the stack mold which has 2 Level ${\times}4$ Cavity is designed and manufactured. Besides, the motion and structural analysis are executed to verify the stability of developed stack mold.
인서트 코어 타입 Cap 성형용 대용량 금형 제작에 관한 연구
정우철,허영무,신광호,윤길상,이정원,Jung, Woo-Chul,Heo, Young-Moo,Shin, Gwang-Ho,Yoon, Gil-Sang,Lee, Jeong-Won 한국금형공학회 2008 한국금형공학회지 Vol.2 No.3
In recent, the demands of household cases and disposable products is increased significantly because a living standard of newly-emerging nations was risen. Therefore, multi-cavity mold and stack mold for the realization of high-productivity have been researched in forefront nations. In this paper, CAE analysis for minimizing the mold core deformation was performed. Finally, 64 cavities injection mold for molding cap which has the insert-type core was fabricated according to the result of CAE analysis.
정우철(Woo-Chul Jung),허영무(Young-Moo Heo),장성호(Sung-Ho Chang),신광호(Kwang-Ho Shin),정태성(Tae-Sung Jung) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
The technologies of mold design, manufacturing, injection molding process and computer aided engineering(CAE) are developed rapidly with the growth of plastic product market. CAE provide the opportunity to evaluate a filling, packing, cooling, shrinkage and warpage in mold design stage. In this study, the filling and warpage analyses of semiconductor test socket(1089pin BGA) are performed using CAE software.
천왕봉과 안양산을 중심으로 한 무등산응회암의 암석학적 연구
정우철(Woochul Jung),길영우(Youngwoo Ki),허민(Min Huh) 한국암석학회 2014 암석학회지 Vol.23 No.4
중생대 능주분지 내 형성된 무등산응회암은 기존에 여러 암석으로 명명되었으나, 무등산응회암 내 용결구조, 피아메, 암편, 기질의 탈유리화 등을 고려할 때, 무등산응회암이라는 통일된 명칭을 사용하는 것이 바람직하다. 천왕봉 지역과 안양산 지역 무등산응회암은 야외에서 경계가 뚜렷하지 않지만, 암석화학 및 광물화학적 특징과 연대측정 결과에 의해 천왕봉과 안양산 지역 무등산응회암으로 대분된다. 두 지역 무등산응회암은 섭입대 환경의 동원마그마에서 기원한 칼크-알카리 계열의 데사이트질 용결응회암이며, 결정질 응회암이다. 천왕봉 지역 무등산응회암은 안양산 지역 무등산응회암을 형성한 마그마에서 주로 사장석 정출에 의해 형성되었다. Even though Mesozoic Mudeungsan tuff, located within Neungju Basin, has been named several rock names, it should be named as Mudeungsan tuff due to several evidences, such as fiamme, welded texture and rock fragments in the Mudeungsan tuff. Volcanic eruption boundary between the Cheonwangbong and Anyangsan areas is not clear, but petrochemical and mineral chemical evidences with different ages indicate clear petrological boundary between Cheonwangbong and Anyangsan. The Mudeungsan tuffs from Cheonwangbong and Anyangsan is welded crystal tuff with dacitic composition and were generated from cogenetic calc-alkaline magma in the volcanic arc environment. Geochemical events indicate that magma beneath Cheonwangbong was seems to have been evolved from the magma beneath Anyangsan due to fractional crystallization dominated by plagioclase.