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심종엽(Jongyoup Shim),황주호(Jooho Hwang),박천홍(Chun-Hong Park) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.2
It is an important thing for a designer to simulate and predict the performance of a spindle and a rotary table. In addition to the general performance such as static stiffness, the error motion performance information is beneficial to the designer in many cases. However for an aerostatic bearing the fluid film physical status should be calculated in order to simulate those performances and the calculation time is another obstacle for a simple performance simulation. In this paper the investigation on experiment and simulation is performed in order to find a more effective simulation method for the rotational error motion.
초정밀 유정압 베어링 이송 테이블의 나노미터 위치결정 제어에 관한 연구
심종엽(Jongyoup Shim),박천홍(Chun-Hong Park),송창규(Chang-Kyu Song) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.12
An ultraprecision multi-axis machine tool has been designed and developed in our laboratory. The machine tool has four moving axes which are composed of three linear axes and one rotational axis. It has a gantry type structure and the Z-axis is on the X-axis and the C-axis, on which a workpiece is located, is inside the Y-axis. This paper shows control performance improving method and procedure for the ultra-precision positioning control of a hydrostatic bearing guided linear axis. Through improvements of electrical and mechanical components for the control system such as control electronics and oil pumping systems, the control disturbing noise is decreased. Also by the frequency domain analysis of control system those problem-making system components are identified and modified with analytical methods. The controller is analyzed and designed from frequency domain data and system information. In the experimental control results the nanometer order control result is successfully presented.
DLC 코팅된 가이드레일을 이용한 볼베어링 직선 이송 스테이지의 진공환경 제어 특성 분석
심종엽(Jongyoup Shim),김경호(Gyungho Khim),황주호(Jooho Hwang) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.4
Recently, there is an increase in the need for precision linear stages with vacuum compatibility in such areas as lithography equipment for wafer or mask manufacturing, mask mastering equipment for optical data storage and electron beam equipment. A simple design, high stiffness and low cost can be achieved by using ball bearings. However, a ball bearing have friction and wear problems just as in ambient air. In order to decrease the friction, a special finish, a diamond-like carbon (DLC) film coating, is applied to the surface of a guide rail by sputtering deposition. This paper presents the result of an experimental investigation on the control performance of a ball bearing?guided linear motion stage under two environmental conditions: in air and vacuum. A comparison between the results with and without the DLC coating was also considered in the experimental investigation.
대형 복합수직선반 가공기용 유정압베어링 회전테이블 성능 실험 및 분석
심종엽(Jongyoup Shim),오정석(Jeong-Seok Oh),박천홍(Chun-Hong Park),신흥철(Heung-Chul Shin),박우상(Woo-Sang Park),김민재(Min-Jae Kim),김민수(Min-Soo Kim) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.7
The large volume multi-tasking vertical lathe was developed for machining the bearing parts for a wind power generator. Although the machined part is large in size high precision tolerances are required recently. One of the most important components to achieve this mission is the rotating table which holds and supports the part to be machined. The oil hydrostatic bearing is adopted for the thrust bearing and the rolling bearing for the radial bearing. In this article experimental performance evaluation and its analysis results are presented. The rotational accuracy of the table is assessed and the frequency domain analysis for the structural loop is performed. And in order to evaluate the structural characteristic of table the moment load experiment is performed. The rotational error motion is measured as below 10 μm for the radial and axial direction and 22,800 Nm/arcsec of moment stiffness is achieved for the rotary table.
UV-Nanoimprinted Photonic-Crystal Structure for Organic Light-Emitting Diodes
심종엽(Jongyoup Shim),전소희(Sohee Jeon),윤재륜(Jae-Ryoun Youn),강재욱(Jaewook Kang),김장주(Jang-Joo Kim),김세헌(Se-Heon Kim),정준호(Jun-ho Jeong),최대근(Dae-Geun Choi),김기돈(Ki-Don Kim),알리알툰(Ali Ozhan Altun),최준혁(Junhyuk Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
A conventional OLED has only about 20 % light extraction efficiency. When a photonic crystal layer is put in between the anodic layer and the substrate, the light can be extracted to the air by the optical diffraction phenomena. In this article we form a photonic crystal layer (nano-patterned array) directly on the transparent substrate by the UV-nanoimprinting method with a polymer resin. By the FDTD simulation the enhancement of the light extraction is assessed. And the fabrication process details including UV-nanoimprint, SixNy interlayer and OLED layers are presented in this article. The experiment shows that with the imprinted photonic crystal structure the light extraction efficiency is increased by ~50% comparing with the conventional OLED and therefore this nanoimprinted photonic crystal OLED is a promising technology for the future OLED display and illuminator applications.
황주호(Jooho Hwang),심종엽(Jongyoup Shim),고태조(Tae Jo Ko) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.8
The volumetric errors of CNC machining centers are determined by 21 errors, including 3 linear errors, 6 straightness errors, 3 perpendicular errors, 9 angular errors and non-rigid body errors of the machine tool. It is very time consuming and hard to measure all of these errors in which laser interferometer and other parts are used directly. Hence, as many as 21 separate setups and measurements are needed for the linear, straightness, angular and perpendicular errors. In case of the 5-axis machining centers, two more rotary tables are used. It can make 35 error sources of the movement. Therefore, the measured errors of multi movements of the 5-axis tables are very complicated, even if the relative measured errors are measured. This paper describes the methods, those analyze the error sources of the machining centers. Those are based on shifted diagonal measurements method (SDM), R-test and Double ball bar. In case, the angular errors of machine are small enough comparing with others, twelve errors including three linear position errors, six straightness errors and three perpendicular errors can be calculated by using SDM. To confirm the proposed method, SDM was applied to measuring 3 axes of machine tools and compared with directly measurement of each errors. In addition, the methods for measuring relative errors of multi-axis analysis methods using R-test and Double Ball Bar are introduced in this paper.