http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
서금희 ( Kum Jee Seo ),김기영 ( Ki Young Kim ),문병문 ( Byung Moon Moon ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.3
A series of refractory mold coatings were applied to cast iron specimens, and their resistances to wear and spalling were investigated. Tests were carried out with own made measures, and also a calculation was tried for the comparison of a part of results like spalling. Worn width by scrubbing the indenter on the coating layer increased significantly at high temperature. Temperature increasing rate across the specimen when the coating side was exposed to 1,000oC was in the range of 14.5~75.8oC/sec·mm, and specimens with thicker coating layer showed lower temperature increase. Severe spalling of coated layer was observed after heating the specimen, and it was able to confirm by calculation using a commercial code.
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.
용매정제법과 원심분리법으로 추출한 Si의 순도에 미치는 장입 원재료 순도의 영향
조주영,서금희,강복현,김기영 대한금속·재료학회 2012 대한금속·재료학회지 Vol.50 No.12
High purity silicon can be obtained from Al-Si alloys by a combination of solvent refining and centrifugation. Silicon purification by crystallization of silicon from an Al-Si alloy melt was carried out using 2N and 4N purity aluminum and 2N purity silicon as raw materials. The effect of the purity of raw materials on the final silicon ingot purity by centrifugation was investigated for an Al-50 wt% Si alloy. Alloys were melted using an electrical resistance furnace, and then poured into a centrifuging apparatus. A silicon lump like foam was obtained after centrifugation and was leached by an acid in order to get pure silicon flakes. Then silicon flakes were melted to make a silicon ingot using an induction furnace. The purities of the silicon flakes and silicon ingot were enhanced significantly compared to those of the raw materials of silicon and aluminum. The silicon ingot made of 4N aluminum and 2N silicon showed the lowest impurities.
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.