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EPS 엔드밀 가공 시 표면 거칠기에 미치는 가공조건에 관한 연구
서금희,손민규,윤길상,고영배,Seo, Keum-Hee,Son, Min-Kyu,Yoon, Gil-Sang,Ko, Young-Bae 한국금형공학회 2017 한국금형공학회지 Vol.11 No.2
EPS used in lost foam casting elastic modulus is extremely low. So it is necessary to derive machining conditions for effective cutting. Therefore this study were analyzed end-milling machining conditions to affecting the surface roughness of EPS foam. The machining conditions were set to depth, feed, and RPM at 3-level. And 18experimental conditions were derived using mixed orthogonal array. The most important condition for surface roughness is RPM. In addition, RPM machining condition range test that can realize surface roughness less than $10{\mu}m$ was performed. he range of RPM conditions is more than 15,000. However the range of RPM conditions is a condition that is difficult to use in actual field. In the future variance analysis and experiments are needed to derive the range of machining conditions available.
단일 절삭을 이용한 미세금형의 구배각 구현에 관한 연구
서금희(Keum Hee Seo),우창기(Chang Ki Woo),서태일(Tae Il Seo),윤길상(Gil Sang Yoon) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Recently micro molds for plastic injection processes or micro stamping processes (hot embossing processes) were generally required for various micro-scaled products. In cases of micro molds various problems appears because relatively small tools have to be used. In our study, strongly concerned an approach which allows to machine suitable draft angles by only one pass cutting through adjustment of cutting conditions so that tool deflection effects should cause machining errors as much as required draft angles.
Multi-cavity 프리폼 사출 금형 코어의 표면 품질 및 균일도 향상을 위한 연마 자동화 기구 개발
이정원,서금희,윤길상,Lee, Jeong-Won,Seo, Keum-Hee,Yoon, Gil-Sang 한국금형공학회 2014 한국금형공학회지 Vol.8 No.2
Automated polishing apparatus based on the research have been developed. The research is improvement of polishing process for surface quality and uniformity improvement of preform injection mold core. Surface quality of preform core have influence on ejecting and product quality after injection molding. Thus, the current being made by hand to automate the polishing process, the surface of the preform to improve the quality and uniformity improvement. First made a division by analyzing manual process a step-by-step. And draw a mechanism for converting mechanical movement. Automated polishing apparatus for preform core was developed, through which shortens production time and were able to secure the safety of the worker.
유한요소법을 이용한 One Touch Clamp 설계 및 개발에 관한 연구
송병욱(Byeong-Uk Song),서금희(Keum-Hee Seo),임용석(Yong-Seok Lim),신용욱(Yong-Wook Shin),이정원(Jung-won Lee) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
본 논문에서는 유한요소법을 이용하여 차량용 One Touch Clamp 의 개발에 관하여 연구하였다. 유한요소법을 이용한 해석을 진행하기에 앞서 One Touch Clamp 의 모델링을 하였고, 인장 실험을 통하여 One Touch Clamp 의 물성치를 얻어 이를 바탕으로 유한요소법을 이용하여 응력분포도 확인으로 Clamp 의 안정성을 확보하였다. 또한 실제 차량의 주행조건과 동일한 조건에서 Clamp 의 조임력을 통한 누수 압력을 검토하여 Clamp 에 Leak 의 발생여부 및 누수여부를 확인하여 Cla,p 의 이상유무를 판단하여 개발을 진행하였다.