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노승국(Seung-Kook Ro),박종권(Jong-Kweon Park) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
In this paper, we report a novel surface motor stage supported air bearings and driven by electromagnetic linear motors to be used in a compact sized precision machine systems, such as micro-machine tools or measurement system with minimum height of the X-Y stage. By combining actuations of motors simultaneously, X and Y linear motions can be generated, and angular motion is also possible to control. To control planar motion, a grid encoder is used, and a programmable numerical controller is used to control this system. The thrust force and attraction force were calculated with magnetic circuit model. The designed prototype is 220 (L) × 220 (W) × 66 (H) ㎣ in total size with movement range with 20 ㎜ × 20 ㎜. The prototype was fabricated, and basic aspects such as vertical stiffness and thrust force were evaluated. For the positioning control, 20 ㎚ of positioning resolution was obtained for X and Y axis, and three motions could be controlled separately.
Air-Bag 가압식 300 ㎜ 웨이퍼 폴리싱 테이블의 가압 분포 해석
노승국(S. K. Ro),박종권(J. K. Park),이상열(S. Y. Lee),편도선(D. S. Pyun) 한국생산제조학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
In this paper, the contact pressure of the wafer and polishing pad were investigated through numerical analysis using FEM tool, ANSYS 9.0. The distribution of the contact pressure is one of main parameters affect on the flatness and surface roughness of polished wafers. Two types of air polishing head, a hard type head with ceramic disk and soft type head with air bag compression were considered. The effects of the table deformation and initial shape on the contact pressure and deformation were also examined. Both heads and tables were modeled as solid model and finite element model, and the material properties of polishing pads and rubber plate for the air-bag head were used based on the tensile tests. The distribution errors of the air-bag head were smaller than hard type head even when the table was convex or concave shape, so it could be concluded that the air-bag head is advantageous for the uniformity of the contact pressure.