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노승국(Seung-Kook Ro),박종권(Jong-Kweon Park),박현덕(Hyun-Duk Park) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
This paper introduces recently designed desktop sized NC lathe system and its components. The machine is designed for precision turning of circular parts with 0.5 ~ 20 ㎜ in diameter and length less than 50 mm, with minimum space usage. In this study, it is aimed to achieve high accuracy of the movements and good rigidity of the machine with practical machine, and the components such as main machine structure, spindle and XZ stage were designed to support these performances. The manufactured system has been evaluated for its performances, and some machining examples are shown.
노승국(Seung-Kook Ro),김경호(Gyungho Khim),신우철(Woochul Shin),박종권(Jong-Kweon Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This paper introduces a system to machine micro-sized pat-terns effectively on surface based on micro-milling process using tools with rotation and oscillation. A spindle supported by active magnetic bearings in radial directions were devel-oped and implemented for proposed system. The rotating axis of the tool can be moved faster than stage system up to 500 ㎐ of within air gap as amplitude. This can be applied for repeated patterns without movement of stages carrying workpiece or spindle which have usually slower response time. To review the effectiveness of proposed concept, we integrated the proposed micro-spindle with active magnetic bearings with a precision 3-axis air bearing stage using double-wedge mechanism, and tested this oscillation milling. A flat end mill with 0.8 ㎜ diameter rotating 100 krpm was induced to workpiece with 35 degrees of inclination angle while oscillated 200 ㎐ in radial direction. The results show machined pattern spacing 17 ㎛ and 35 ㎛.