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최학봉(Hag-Bong Choi),조성기(Sung-Gi Jo),이종훈(Jong-Hoon Lee),신흥철(Shin-Heung Chul) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
풍력발전기용 베어링 가공을 위한 복합수직선반은, 이미 유럽 및 구미에서 양산에 돌입하여 2㎿급 풍력기용 베어링과 Tower flange를 생산 중에 있다. 본 연구에서는 이에 대응함은 물론, 향후 3~5년 후에 양산체제에 돌입할 것으로 예상되는 5MW급 발전기의 베어링에 대응 가능하도록 최대 가공경이 5M에 이르는 대형 공작물의 고정도 , 고속 가공기 개발함에 그 목적이 있다. 본지에서는, 이론적 해석을 통한 최적 구조설계에 대해서 논하겠다.
풍력 발전기 부품가공용 복합수직선반의 최적 설계에 관한 연구
최학봉(Hag Bong Choi),이종훈(Jong Hoon Lee),박우상(Woo Sang Park),신흥철(Heung Chul Sin),오정석(Jong-Suk Oh),박천홍(Chun Hong Park),이동윤(Dong Yun Lee) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.2
Wind power, which is one of the promising renewable energies, has shown the high growth rate of 35 % of the annual average in the recent 5 years and also windmill related equipment market has been fast-growing. Yaw & Pitch bearing are the key parts of windmill and are machined by huge vertical lathe which is monopolized by the advanced countries. The purpose of this study is to develop the multi-tasking vertical lathe for 5 ㎿ grade windmill bearings, which might be mass produced 3 or 5 years later. In this study, the structure of the crossrail and rotary table, which are the key units of the huge multi-tasking vertical lathe, were optimized through the finite element analysis. Also the basic performance of the rotary table has been evaluated.
최영휴(Young-hyu Choi),안호상(Ho-sang An),최학봉(Hag-bong Choi),홍종승(Jong-seung Hong) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Recently, the demands of the large scale machine tools gradually increase to machine the large parts, such as large scale crankshaft, yaw and pitch bearings for the wind power generator and the vehicle or aircraft components. But the high technology is necessary in order to develop the huge machine tools. Furthermore, the global market of it has been monopolized by a few company. So, we need to develop the large scale machine tools and study it's core technology to rush into the increasing market. In this study, we carried out the researches for the important core technology of a multi-tasking machine tool; a multi-tasking machine tool for large scale marine engine crankshaft, multi-tasking vertical lathe for windmill parts, and large scale 5-axis machine tool of gantry type for multi-task machining.
최영휴(Young-Hyu Choi),김수태(Soo-Tae Kim),안호상(Ho-Sang An),최학봉(Hag-Bong Choi),홍종승(Jong-Seung Hong) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This paper introduces manufacturing technologies for each of the 3 different kind of large scale multi-tasking machine tools; for special examples, a multi-tasking machine tool for large scale marine engine crankshaft, a multi-tasking vertical lathe for windmill parts, and a large scale 5-axis machine tool of gantry type for multi-task machining to machine highly precision large parts.
장성현(Sung Hyun Jang),최영휴(Young Hyu Choi),김수태(Soo Tae Kim),안호상(Ho Sang An),최학봉(Hag Bong Choi),홍종승(Jong Seung Hong) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.2
In this study, three types of large scale multi-tasking machine tools together with core technologies involved have been developed and introduced; a multi-tasking machine tool for large scale marine engine crankshafts, a multi-tasking vertical lathe for windmill parts, and a large scale 5-axis machine tool of gantry type. Several special purpose devices has been necessarily developed for the purpose of handling and machining big and heavy workpieces accurately, such as PTD (Pin Turning Device) with revolving ring spindle for machining eccentric crankshaft pins, hydrostatic rotary table and steady rest for supporting and resting heavy workpieces, and 2-axis automatic swiveling head for high-quality free surface machining. Core technologies have been also developed and adopted on their detail design stage; 1) structural design optimization with FEM structural analysis, 2) theoretical hydrostatic analysis for the PTD and rotary table bearings, 3) box-in-box type cross-rail and octagonal ram design to secure machine rigidity and accuracy, 4) constant spindle rpm control against gravitational torque due to unbalanced workpiece.
공구 중심점의 변위 최소화를 위한 문형 공작기계의 크로스레일 개선 연구
이명규(Myung-Gyu Lee),송기형(Ki-Hyeong Song),최학봉(Hag-Bong Choi),이동윤(Dong-Yoon Lee) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.3
General portal machine represents a distinct weak spot concerning their structural behavior because of long protruding structure components, such as saddles and rams. The weak point causes the deformation of the machine tool and consequently rises a severe machining error. The purpose of this study is to improve the structural design of crossrail in order to minimize it’s distortion. Tool Center Point (TCP) was chosen as a reference point for evaluating the distortion effect of a crossrail and topological optimization was adopted as a method of structural design improvement. The displacements of TCP according to the machining positions were investigated by structural analyses for both of original crossrail design and the improved one. The comparing results showed that the displacement of TCP could be reduced about 55% maximum.
공구 중심점의 변위 최소화를 위한 문형 공작기계의 크로스레일 개선 연구
이동윤(Dong-Yoon Lee),이명규(Myung-Gyu Lee),이종훈(Jong-Hoon Lee),최학봉(Hag-Bong Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
General portal machine represents a distinct weak spot concerning their structural behavior because of long protruding structure components, such as saddle & ram. TCP was chosen as a reference point for evaluating the contortion effect of Crossrail. The structural analysis of two cases were performed and the displacement of the TCP were compared. The purpose of this study is to minimize contortion through design improvement of crossrail.
金鐘煥,金南萬,朴塡淑,崔鶴鳳 忠南大學校 環境問題硏究所 1986 環境硏究 Vol.4 No.2
This study was undertaken to elucidate the status of trematodes infection at the several localities along the Gagok Stream-side area, Wondeog Eup, Samcheok Gun, Gangwon Do, Korea from February 1985 to July 1986. A total of 2,195 snails was examined for cercaria, and individuals 74(3.4%) were infected with cecaria of trematoda: Cercaria nipponensis, cercaria of Metagonimus yokogawai, M.takahashii and Pseudexorchis major. A total of 105fishes, 10species, 6families was examined for metacercaria, and 4fished (4%), 3 species, 3families were infected with metacercaria of Metagonimus yokogawai, M.takahashii and hasegawa A. A total of 1,014 crayfishes was examind, only one crayfish was positive with metacercaria of Paragonimus westermani. The parasite eggs and cysts from domestic animals (11cats and 13dogs) were found Paragonimus westermani, Dihpyllobothrium spp., Toxocara cati, Toxocara canis and Iso pora rivolta.