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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.
Gantry Type 대형 공작기계의 Cross Rail 설계 및 좌우 이송 편차에 관한 해석
이응석(Eung Suk Lee),이민기(Min Ki Lee),박종범(Jong Bum Park),김남성(Nam Sung Kim),함준성(Jun Sung Ham),홍종승(Jong Seung Hong),김태성(Tae Sung Kim) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.2
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 companies. So, we need to develop the large scale machine tools and study its 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 large scale 5-axis machine tool of gantry type for multi-task machining. This study is focused on the design of large size gantry type multi-axis machine. In the case of large size of machine the cross rail deflection in the X-axis is significant. To reduce the deflection due to the eccentric spindle head, a special hollow type design in the cross rail with outside ram is adapted in this study. Also, the Zig-Zag motion in the Y-axis is inevitable with the gantry geometry, which is by the un-balancing, different motion at the left and the right columns moving. We tried to reduce the influence of Zig-Zag motion using FEM with different loading conditions at the left and the right side column.
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.