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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.
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.
〈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.
이석우(Seokwoo Lee),남성호(Sungho Nam),송기형(Kihyeong Song),이동윤(Dongyoon Lee),최헌종(Honzong Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Nowadays, much attention is being paid to topic map - a kind of searching method based on meanings - for a solution which helps people manage and integrate huge amount of technical information and retrieve correct ones fast and effectively. This paper proposed the integrated KMS (Knowledge Management System) of technical information needed when developing injection molds. Based on the results of injection molding CAE analyses and the use-case models of the people who develop injection-molds, the technical knowledge management system was designed and constructed in the engineering collaborative hub. This system consists of the integrated ontology model of technical information utilizing topic map approach and the retrieval system based on meanings in the field of injection mold development. The ontology of the developed systems is updated automatically.
니켈 도금 롤금형의 프리즘 가공을 위한 FEM 시뮬레이션 연구
박경희(Kyung-Hee Park),이동윤(Dong Yoon Lee),송기형(Kihyeong Song),이석우(Seokwoo Lee) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Micro cutting process for prism patterning on nickel plated roll die was simulated using finite element method based on Lagrangian method in which the mesh is attached to the material. In the simulation, the work material, nickel plated die, was cut by diamond tool assumed as a rigid body. Johnson-Cook plasticity model of nickel 200 was used for constitutive plasticity law of the work material. Using shear failure damage model for chip separation criterion, the chip was separated and formed by eroding the elements in the work material if the element failure criterion was met. In addition, Coulomb friction law was considered for interfacial condition between the tool and work surface. From the simulation, continuous type chip was obtained and compared with the experimental results.
Manufacturing Innovation Strategy via On-line Collaboration
이석우(Seokwoo Lee),류광열(Kwangyeol Ryu),최영재(Youngjae Choi),송기형(Kihyeong Song),최헌종(Honzong Choi) 한국로고스경영학회 2007 한국로고스경영학회 학술발표대회논문집 Vol.2007 No.7월
Unpredictable and ever changing customer demands make manufacturers difficult to get competition power enough to survive in the global market. To meet customer requirements dynamically changed. the manufacturing industry of today needs to equip with advanced technologies based on substantial infrastructure. Especially most mold makers in Korea. for example. are in labor shortage and fund starvation. Even though they have any specialized technology. they usually get in trouble to compete with big companies. Under this situation. we found that "collaboration" is the best solution for them to survive and to get competition power. Therefore. we have launched and conducted a project. referred to as an e- Manufacturing project. Note that e- Manufacturing is referred to as a system methodology enabling the integration of manufacturing operations and functional objectives of an enterprise by using intelligent IT technologies such as Internet. tether-free communication methods including wireless networking or web-based connections. In order to provide on-line collaboration environment. we have developed five kinds of hub systems for collaborative design and production of molds as well as parts/modules of an automobile while conducting e-Manufacturing project funded by the Korea government. Since the outcomes by utilizing each hub system are evaluated to be very beneficial for increasing competition power of Korean small and medium size companies. the Korea government will launch more bigger project. referred to as "i-Manufacturing project" which include nor only e-Manufacturing as a title of "innovation by informatization" but manufacturing processes and systems. In this paper, therefore. we briefly introduce the outline of the e-Manufacturing project and the strategy of i-Manufacturing project with the outcomes of the e-Manufacturing project in 2006 as well.
Topic-Map을 이용한 사출성형 유동해석 결과 기반의 지식관리시스템
이동윤,송기형,남성호,이석우,최헌종 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
Nowadays, much attention is being paid to topic map - a kind of searching method based on meanings - for a solution which helps people manage and integrate huge amount of technical information and retrieve correct ones fast and effectively. In order to achieve win-win cooperations between the large enterprises and SMEs (Small and Medium Enterprises), engineering collaborative hub was developed and lots of CAE service - injection-mold flow analysis - were conducted. This paper proposed the integrated KMS(Knowledge Management System) of technical information needed when developing injection molds. Based on the results of injection-mold flow analyses and the use-case models of the people who develop injection-molds, the technical knowledge management system was designed and constructed in the engineering collaborative hub. This system consists of the integrated ontology model of technical information utilizing topic map approach and the retrieval system based on meanings in the field of injection mold development