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전도성을 가지는 탄소나노튜브강화 알루미나복합소재의 마이크로방전가공에서 초음파진동 부가에 의한 가공특성
강명창(Myung-Chang Kang),탁현석(Hyun-Seok Tak),이창훈(Chang-Hoon Lee),김남경(Nam-Kyung Kim) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.6
Micro-holes of conductive ceramic are required in micro structures. Micro-electrical discharge machining (Micro-EDM) is an effective machining method since EDM is as process for shaping hard metals and complex-shaped holes by spark erosion in all kinds of electro-conductive materials. However, as the depth of micro hole increases, the machining condition becomes more unstable due to inefficient removal of debris between the electrode and the workpiece. In this paper, micro-EDM was performed to evaluate machining characteristic such as electrode wear, machining time, taper angle, radial clearance with varying voltage and ultrasonic vibration on 10 vol.% Carbon-nanotube reinforced conductive Al₂O₃ composite fabricated by spark plasma sintering in previous research.
탁현석(Hyun Seok Tak),하창승(Chang-Seung Ha),김동현(Dong-Hyun Kim),이해준(Hae June Lee),강명창(Myung Chang Kang) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Tungsten carbide(WC) is an extremely difficult hard because of its superior wear and corrosion resistance, electro discharge machining(EDM) is an effective method of machining. Since EDM is a process for shaping hard metals and complex-shaped holes by arc erosion in all kinds of electro-conductive materials. In micro-EDM, the fabrication of micro-parts requires minimization of the pulse energy supplied into gap which can be fulfilled using the RC circuit. Therefore, RC circuit could be more suitable for fabricating micro-structures. In this study, using the RC circuit, micro-EDM of tungsten carbide was conducted to investigate the machining characteristics and electro-optical characteristics according to the variation of resistance and capacitance.
이선우,이동주,이응숙,제태진 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
The needs for precision machining of micro to milli parts have been increased as the industry require high quality products, especially for the micro-machining of IT products. The ultra-precision machining system is essential for the micro machining of fine structures, which insures machining accuracy, low systematic and random error and repeatability. In this study, we developed micro machining system, which is equipped with air bearing stage for ultra precision machining and also we present the results of V-grooving experiments, conducted by the developed system, to verify the performance of system. The results show that the machined V-grooving had good accuracy with repeatable stability.
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.
전동훈(Dong Hun Jeon),김보현(Bo Hyun Kim),박병진(Byung Jin Park),주종남(Chong Nam Chu) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
In this study, micro electrical discharge machining (EDM) and micro electrochemical machining (ECM) were used for the fabrication of micro structures. Despite no tool wear and good surface finish, micro ECM shows low machining speed. On the other side, micro EDM that has tool wear and worse surface finish provides better characteristics in machining speed. Therefore, the micro machining process using both EDM and ECM is proposed to complement each other. This hybrid process uses micro EDM as roughing cut and micro ECM as finishing cut. The hemisphere of 100 ㎛ radius was fabricated by this process with simple cylindrical tool electrode. The final shape shows the improvement in machining speed, surface finish and dimension accuracy.
마이크로 마스크를 가진 미세입자분사가공을 위한 가공경로의 생성
김호찬(Ho-Chan Kim),이인환(In-Hwan Lee),고태조(Tae-Jo Ko) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
Micro-abrasive jet machining(μAJM) using mask is a fine machining technology which can carve a figure on a material. The mask should have holes exactly same as the required figure. Abrasive particles are jetted into the holes of the mask and it collide with the material. The collision break off small portion of the material. And the μAJM nozzle should move all over the machining area. However, in general the carving shape is modeled as in a bitmap figure, because it often contains characters. And the mask model is also often modeled from the bitmap image. Therefore, the machining path of the μAJM also efficient if it can be generated from the bitmap image. This paper suggest an algorithm which can generate μAJM tool path directly from the bitmap image of the carving figure. And shows some test results and applications.
제태진(Tae-Jin Je),최두선(Doo-Sun Choi),전은채(Eun-Chae Jeon),박언석(Eun-Suk Park),최환진(Hwan-Jin Choi) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
Recent ultra-precision machining systems have nano-scale resolution, and can machine various shapes of complexstructures using five-axis driven modules. These systems are also multi-functional, which can perform various processes such as planing, milling, turning et al. in one system. Micro machining technology using these systems is being developed for machining fine patterns, hybrid patterns and high aspect-ratio patterns on large-area molds with high productivity. These technology is and will be applied continuously to the fields of optics, display, energy, bio, communications and et al. Domestic and foreign trends of micro machining technologies for flat molds were investigated in this study. Especially, we focused on the types and the characteristics of ultra-precision machining systems and application fields of micro patterns machined by the machining system.
김근영(Keun-Young Kim),김우곤(Woo-Gon Kim),김영일(Young-Il Kim),강명창(Myung-Chang Kang) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Recently the needs of integrated system for micromachining and measurement have been increasing with advent of micro-factory system. Also high hardness materials have been much used. It is difficult to machine these materials by conventional machining. Such materials can be easily machined by EDM because hardness is not a effect parameter in EDM. Therefore, in this paper, integrated EDM machine for micro-hole machining and measurement was developed.
신민철(Min Chul Shin),박지원(Ji Won Pack),김규만(Gyu Man kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.10
역-방전가공(Reverse-Electric Discharge Machining)은 기존 방전가공과 달리 가공된 영역을 갖는 금속패턴을 전극으로 사용하며 이는 MEMS의 Negative Photoresist와 비슷한 역할을 한다. 전압을 인가한 금속과 피가공물의 간극이 미소한 거리로 좁혀질 때 전기에 의한 열에너지가 가공된 영역을 제외한 형상 그대로 피가공물에 전사되는 원리이다. 역-방전가공의 장점을 활용하면 단단한 재료와 복잡한 형상의 가공이 가능하며 높은 세장비의 미세공구, 전극, 니들 등 다양한 연구 분야에 적용이 가능하다. 본 연구에서는 방전가공을 통해 금속 시편에 직경 200um의 홀 어레이 패턴을 가공하였고, 금속시편에 홀어레이 패턴을 역-방전가공을 통해 초경합금에 패턴을 전사시켜 다중 미세전극을 제작하였다. 제작된 공구를 사용하여 방전가공을 진행하고 가공조건에 따른 가공특성을 비교 분석하였다. Reverse-Electric Discharge Machining is different from general electric discharge machining and uses a metal pattern with a machined area as an electrode, which plays a similar role to the negative photoresist of the MEMS process. When the gap is narrowed to a minute distance after applying a voltage to the metal pattern and the workpiece, the thermal energy of electricity removes the workpiece as it is in the pattern. By using the advantages of the processing method, it is possible to process hardness materials and complex shapes, and it can be used in various research fields such as high aspect ratio micro tools, electrodes, and needles. In this study, a hole array pattern with a diameter of 200μm was machined on a metal plate through electric discharge machining, and a multiple microelectrode was fabricated using R-EDM. EDM was performed using a multiple micro electrode, and a study was conducted on comparative analysis of characteristics according to processing conditions.
전동훈(Dong Hun Jeon),김보현(Bo Hyun Kim),박병진(Byung Jin Park),주종남(Chong Nam Chu) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.10
In this study, micro electrical discharge machining (EDM) and micro electrochemical machining (ECM) were used for the fabrication of micro structures. Despite no tool wear and good surface finish, micro ECM shows low machining speed. On the other side, micro EDM that has tool wear and worse surface finish provides better characteristics in machining speed. Therefore, the micro machining process using both EDM and ECM is proposed to complement each other. This hybrid process uses micro EDM as roughing cut and micro ECM as finishing cut. The hemisphere of 100 ㎛ radius was fabricated by this process with simple cylindrical tool electrode. The final shape shows the improvement in machining speed, surface finish and dimension accuracy.