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롤금형의 동적밸런스 보정을 통한 미세패턴 형상정밀도 향상
이동윤(Dongyoon Lee),홍상현(Sanghyun Hong),송기형(Kihyeong Song),강은구(Eungoo Kang),이석우(Seokwoo Lee) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.1
디스플레이, 광학, 에너지 분야 부품의 미세형상화, 대면적화, 저가격화 요구에 대응하기 위하여 대면적 롤금형의 미세형상 가공기술개발에 대한 필요성이 대두되고 있다. 롤금형은 기존의 평판금형에 비해서 금형의 납기가 빠르고, 대면적화에 용이하며, 연속성형이 가능하다는 장점을 갖고 있다. 본 연구는 롤금형에 미세형상을 가공할 때 발생하는 형상오차의 원인을 규명하는 것을 목적으로 하고 있으며, 가공 현장에서 개선 가능한 요소로서 롤금형의 동적밸런싱 보정방안을 제시하고 있다. 기존보다 정밀한 동적밸런싱 보정을 통하여 롤금형의 질량불평형이 최대 90%까지 감소되었고, 롤금형의 진동량이 0.044㎜/sec (RMS)에서 0.004㎜/sec (RMS)로 감소하였으며, 결과적으로 미세패턴의 형상정밀도가 개선되는 것을 확인할 수 있었다. In the fields of display, optics, and energy, it is important to improve micropattern-machining technology for achieving small patterns, large surface areas, and low cost. Unlike flat molds, roll molds have the following advantages: they can be manufactured within a short time, larger surface areas can be obtained, and continuous molding can be achieved. In this study, we aim to investigate the causes for errors in the shapes for a micropattern-machining process, and we show that by compensating the dynamic balance of roll molds, the dimensional accuracy of machined parts can be improved. The experimental results show that dynamic-balance compensation for a roll mold reduced the mass unbalance and the vibrations of the roll mold, and as a result, the dimensional accuracy of machined micropatterns has been improved.
전해니켈도금된 롤금형의 인함유량 변화에 따른 절삭가공특성
이동윤(Dongyoon Lee),송기형(Kihyeong Song),이석우(Seokwoo Lee),강호철(Hochul Kang),조윤혜(Yunhye Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Roll molds are widely used in the field of optics and electronics in order to meet the quick mass production of parts which have repeated patterns. Roll molds are generally plated with pure copper and machined with single crystal diamond tools in order to meet highly required quality. Because of the short life span of copper plated roll molds, machined roll molds are sometimes used after being coated with chrome or nickel. Another approach to increasing the life span of roll molds is the change of workpiece to harder and more stable one and the electrolytic nickel-phosphorous-alloy is being introduced gradually. Electroless nickel plating is used for flat molds from the past, but electrolytic plating has an advantage for roll molds because the thickness of the plating materials for roll molds should be over 500 ㎛. This study is an attempt to observe the machining characteristic of electrolytic nickel-phosphorous-alloy plated roll mold.
〈기술논문〉 롤금형의 동적밸런스 보정을 통한 미세패턴 형상정밀도 향상
이동윤(Dongyoon Lee),홍상현(Sanghyun Hong),송기형(Kihyeong Song),강은구(Eungoo Kang),이석우(Seokwoo Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
It is important to develop the micro-pattern machining technology of roll molds in order to deal with the requirements of smaller pattern, larger surface and lower cost in the fields of display, optic and energy. Compared with the flat molds, the roll molds have the advantages of fast cutting speed (short delivery), easy making of larger surfaces and continuous molding. This study aims to examine the causes of shape-error in micro pattern machining process and shows that the compensation of dynamic balance for roll molds can improve the uniformity of machined parts. Unbalance of roll mold has been reduced up to 90 % through dynamic balance compensation and the vibration of roll mold has been decreased to 0.004㎜/sec (RMS) from 0.044㎜/sec (RMS). The experimental results show that the dimensional accuracy of micro patterns has been improved.
송기형(Ki-Hyeong Song),이동윤(Dong-Yoon Lee),박경희(Kyung-Hee Park),이석우(Seok-Woo Lee),김현철(Hyun-Cheol Kim),제태진(Tae-Jin Je) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
In order to cope with the requirements of smaller patterns, larger surfaces and lower costs in the fields of displays, optics and energy, greater attentions are now being paid to the development of micro-pattern machining technology. Compared with flat moulds, large drums with micro patterns (roll moulds) have the advantages of short delivery, ease of manufacturing larger surfaces, and continuous moulding. This paper introduced the machining process technology of the roll moulds for display industry. The environmental effects were discussed and the importance of temperature aintenance was experimentally emphasized. The real time monitoring system for micro machining was introduced. A commercial solution was used to simulate the micro grooving and a deformation model of micro machined pattern was finally introduced.
이광일(Kwang-Il Lee),양승한(Seung-Han Yang) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.10
In this study, a measurement method of double ball-bar is proposed to measure the geometric errors of an ultra-precision roll mold machine tool. A volumetric error model of the machine tool is established to investigate the effects of the geometric errors to a radius error and a cylindricity of the roll mold. A measurement path is suggested for the geometric errors, and a ball-bar equation is derived to represent the relation between the geometric errors and a measured data of the double ball-bar. Set-up errors, which are inevitable at the double ball-bar installation, also are analyzed and are removed mathematically for the measurement accuracy. In addition, standard uncertainty of the measured geometric errors is analyzed to determine the experimental condition. Finally, the proposed method is tested and verified through simulation.
미세패턴 선삭에서 공구 공작물 세팅오차에 의한 가공오차 예측
송석균(Seok-Gyun Song),이종민(Jong-Min Lee),최정주(Jeong-Ju Choi),본단(Bondhan Novandy),김수진(Su-Jin Kim),이동윤(Dong-Yoon Lee),남성호(Sung-Ho Nam),이석우(Seok-Woo Lee),제태진(Tae-Jin Je) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This research estimate the cutting error induced from tool and stock setting error when micro pattern is fabricated on the surface of roll mold. The precise turning center and diamond tool is used to cut micro v-shape groove pattern on the wide surface of roll mold. The setting error of tool or roll mold is important for precise cutting and this paper present the relation between setting error and cutting error by geometrical analysis.
이석우(Seok Woo Lee),이동윤(Dong Yoon Lee),송기형(Ki Hyeong Song),강호철(Ho Chul Kang),김수진(Su Jin Kim) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.7
??In order to cope with the requirements of smaller patterns, larger surfaces and lower costs in the fields of displays, optics and energy, greater attentions is now being paid to the development of micro-pattern machining technology. Compared with flat molds, roll molds have the advantages of short delivery, ease of manufacturing larger surfaces, and continuous molding. This paper presents the state-of-the-art of the micro pattern machining technology on the roll molds and introduces some research results on the machining process technology. The copper and nickel-phosphorous-alloy plating process, machining process technology for uniform micro patterns, micro cutting simulation and the real time monitoring system for micro machining are summarized. The developed technologies have led the complete localization of the prism sheets and will be applied to the direct forming process with succeeding research & development.
이석우(S. W. Lee),이동윤(D.Y. Lee),홍상현(S.H. Hong),남성호(S.H. Nam),최영재(Y.J. Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Because the large area ultra precision machining process is a core one for improvement of high-performance for LCD and optical equipments, many international researchers have interests in this topic. This paper introduces some of the international trends and the project plan of a large area ultra precision machining process development. This project consists of machining process development and real-time monitoring system development for high uniformity and high quality.
이종민(Jong-Min Lee),레두이(Duy Le),김수진(Su-Jin Kim),이석우(Seok-Woo Lee),제태진(Tae-Jin Je) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.3
The micro pattern machining on the surface of wide mold is not easy to be simulated by conventional software. In this paper, a software is developed for micro pattern cutting simulation. The 3d geometry of v-groove, rectangular groove, pyramid and pillar patterns are visualized by C+ and OpenGL library. The micro cutting force is also simulated for each pattern.
이종민(Jong-Min Lee),송석균(Seok-Gyun Song),최정주(Jeong-Ju Choi),본단(Bondhan Novandy),김수진(Su-Jin Kim),이동윤(Dong-Yoon Lee),남성호(Sung-Ho Nam),이석우(Seok-Woo Lee),재태진(Tae-Jin Je) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The micro pattern machining on the surface of wide mold is not easy to be simulated by conventional software. In this paper, a software is developed for micro patten cutting simulation. The 3d geometry of v-groove, rectangular groove, pyramid and pillar patterns are visualized by C++ and OpenGL library. The micro cutting force is also simulated for each pattern.