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반도체 패키징 검사장비의 구조 동특성 개선에 관한 연구
노승국,박종권,이혜진,최석우 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
The dynamic performances, such as natural frequency, damping and dynamic compliance are playing bigger roles for high speed inspection equipments for the modern semiconductor production systems. In this study, the dynamic characteristics of the prototype of a inspection system was has been evaluated using ANSYS based modal and harmonic analysis. The inspection equipment need to be operated in high acceleration over 1G with short settling time. The computation and experiment shows that the supporting frame structure of the machine should have enough dynamic stiffness to reduce residual vibration caused by movement of the stages.
3축 마이크로 공작기계용 자기예압 공기베어링 스테이지의 정, 동적 특성
노승국,Kornel F. Ehmann,Yoon, Hyung-Suk,박종권 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
In this paper, the static and dynamic stiffness of the air bearing stage for micro-micro machine tool are examined experimentally. For stiffness and precision concerns, air bearing stages are adapted for 3-axis micro-milling machine which is size of 200x200 mm². The air bearings in the stage are preloaded by permanent magnets to achieve desired bearing clearance and stiffness for vertical direction. As the stiffness of the air bearing is primary interests, static stiffness test were performed on XY stage in Z direction and Z column in Y direction. Dynamic test were performed on XY stage and Z column, respectively. Both static and dynamic tests were performed in different air pressure conditions. The vertical stiffness of XY stage is about 9N/μm where Y stiffness of Z column is much smaller as 1N/μm because of the large moment generated by Y force on the column.
고속 밀링 주축용 자기베어링 시스템의 디지털 제어기 설계
노승국,경진호,박종권 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
The demand of high speed machining is increasing because the high speed cutting provides high efficiency of process, short process time, improved metal removal capacityand better surface finish. Active magnetic bearings allow much high surface speed than conventional ball bearings and therefore greatly suitable for high speed cutting. The automatic control concept of magnetic bearing system provides ability of intelligent control of spindle system to increase accuracy and flexibility by means of adaptive vibration control. This paper describes a design and development of a milling spindle system which includes built-in motor with power 5.5 kW and maximum speed 70,000rpm, HSK-32C tool holer and active magnetic bearing system. Magnetic actuators are designed for satisfying static load condition. The Performances of manufactured spindle system was examined for its static and dynamic stiffness, load capacity, and rotational accuracy. This spindle was run up to 70,000rpm stably, which is 3.5 million DmN.
플라이휠 전지용 영구자석/전자석 조합형 자기베어링의 설계
김종선,노승국 한국 항공대학교 항공산업기술연구소 1995 航空宇宙産業技術硏究所 硏究誌 Vol.5 No.-
This study deals with the design of permanent magnet/electromagnet hybrid type magnetic bearings for flywheel battery system. The new design configuration has the advantage in view of the energy consumption and required electronic hardware compared with the electromagnetic bearing. The influence of the geometric parameters of a ring shaped radial permanent on the load capacity and stiffness is studied and the influences of the design parameters such as energy loss, bandwidth, slew rate and rotor dynamics are also discussed.
형상기억합금 기반 공구 클램핑장치의 자동 공구교환 시스템 개발
신우철,노승국,김병섭,박종권 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
This study developed an auto tool change system of the SMA-based tool clamping device for applications of micro-machine tools. This paper first introduces clamping/unclamping mechanisms of the auto tool change system and its basic configuration. In addition, it shows experimental results of times needed for clamping/unclamping operations of a prototype of the auto tool change system. The average values were estimated to 7.2(s) and 2.6(s) respectively. These results confirm that the auto tool change system is feasible.
레이저 다이싱 장비의 구조 동특성이 빔 안정성에 미치는 영향
박형욱,노승국,박종권,이혜진,최석우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
Inherent merits fabricating thin wafers motivated the development of laser dicing machines. In this study, the dynamic characteristics of the prototype of a laser dicing machine has been evaluated using ANSYS based modal and harmonic analysis. The computation shows that the supporting structure of the laser tube which is a guide of laser beams is stable in terms of the dynamic stiffness. But, the thickness of the beams supporting the upper structure of a laser dicing machine has to be increased.
양방향성 형상기억합금을 이용한 초소형 공작물 클램핑 장치 개념설계
신우철,박형욱,노승국,박종권 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
In this paper, a micro workpiece clamping device, which is possible to be applied in micro machine-tools, based on a shape memory alloy is introduced. Especially, the train procedure to transform a commercial one-way shape memory alloy into a two-way shape memory alloy is described. Also, it is experimentally verified that through the train procedure, the applied shape memory alloy ring exhibits two-way shape memory behavior of 220㎛ deformation. In addition, a conceptual design and a basic configuration of the work-piece clamping device using the two-way type shape memory alloy are suggested.
형상기억합금 기반 공구 클램핑 장치의 원심력 영향 해석
신우철,박형욱,노승국,박종권 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
This paper presents analysis and experimental results for effects of centrifugal force of the SMA-based tool clamping device. First, the corresponding theories of radial deformations resulting from the centrifugal force were described, and based on them, the radial deformations of the contact region between a tool and a tool holder were verified according to rotational speeds. Next, as for 3D-model of the tool holder, analysis of the radial deformations were carried out based on FEM. Finally, the feasibility of the SMA-based tool clamping device at high-rotational speed was experimentally verified by monitoring the clamped tool in mill-machining at 220,000rpm.
복합재료-알루미늄 하이브리드 구조를 이용한 초소형 3축 CNC 머시닝센터의 고강성 고감쇠 설계
김주호,박종권,노승국,장승환 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
In this paper composites-aluminum hybrid structure for 3-axis micro-CNC machining center was introduced to enhance the structural stiffness and damping capacity of the structure. Three types of composites-aluminum hybrid column were proposed; that is, composite reinforcement at 2 lateral surfaces and 4 lateral surfaces and partly reinforced structure (composite jacket) for damping enhancement. Finite element analyses for static deflection due to dead weight and natural frequency were carried out according to the stacking angle and thickness and the most appropriate condition for the design of the composites-aluminum hybrid structure was determined.
Development of a Miniature Air-bearing Stage with a Moving-magnet Linear Motor
Ro, Seung-Kook,Park, Jong-Kweon Korean Society for Precision Engineering 2008 International Journal of Precision Engineering and Vol.9 No.1
We propose a new miniature air-bearing stage with a moving-magnet slotless linear motor. This stage was developed to achieve the precise positioning required for submicron-level machining and miniaturization by introducing air bearings and a linear motor sufficient for mesoscale precision machine tools. The linear motor contained two permanent magnets and was designed to generate a preload force for the vertical air bearings and a thrust force for the stage movement. The characteristics of the air bearings, which used porous pads, were analyzed with numerical methods, and a magnetic circuit model was derived for the linear motor to calculate the required preload and thrust forces. A prototype of a single-axis miniature stage with dimensions of $120\;(W)\;{\times}\;120\;(L)\;{\times}\;50\;(H)\;mm$ was designed and fabricated, and its performance was examined, including its vertical stiffness, load capacity, thrust force, and positioning resolution.