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Al<sub>2</sub>O<sub>3</sub>/CNTs 하이브리드소재의 와이어 방전연삭을 이용한 마이크로 방전가공 특성
탁현석,김종훈,임한석,이춘태,정영근,강명창,Tak, Hyun-Seok,Kim, Jong-Hun,Lim, Han-Suk,Lee, Choon-Tae,Jeong, Young-Keun,Kang, Myung-Chang 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.4
Electrical discharge machining (EDM) is an attractive machining technique but it requires electrically conductive ceramic materials. In this study, Alumina matrix composites reinforced with CNTs were fabricated through CNT purification, mixing, compaction and spark plasma sintering (SPS) processes. $Al_2O_3$ nanocomposites with the different CNT concentrations were synthesized. The mechanical and electrical characteristics of $Al_2O_3$/CNTs composites were examined in order to apply the materials to the EDM process. In addition, micro-EDM using wire electrical discharge grinding (WEDG) was conducted under the various EDM parameters to investigate the machining characteristics of machined hole by Field Emission Scanning Electron Microscope (FE-SEM). The results show that $Al_2O_3$/CNTs 10%Vol. was more suitable than the other materials because high conductivity and large discharge energy caused violent sparks resulting in bad machining accuracy and surface quality.
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.
Al₂O₃/CNT 하이브리드 소재의 마이크로방전가공을 위한 RC 방전과 펄스구동의 효과
탁현석(Hyun-Seok Tak),신승열(Seung-Yul Shin),강명창(Myung-Chang Kang),하창승(Chang-Seung Ha),이호준(Ho-Jun Lee),이대열(Dae-Yeol Lee) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
This paper described the effect of RC discharging and pulse generation for micro-EDM of micro-hole fabrication with Al₂O₃/CNTs hybrid nanocomposites. Alumina matrix composites reinforced with CNTs were fabricated by CNT purification, mixing, compaction and sintering processes. Al₂O₃ nanocomposites with different CNT concentrations were successfully synthesized. The mechanical and electrical characteristics of Al₂O₃/CNTs composites were examined in order to evaluate machining characteristics. The pulse driven circuit was newly designed to evaluate the machining property using RC discharge and pulsed generator. Characterization of machined micro holes was conducted by Field Emission Scanning Electron Microscope (FE-SEM) after actual RC Discharged EDM and pulse driven EDM, respectively.
Al₂O₃/CNT 하이브리드 소재의 마이크로방전가공을 위한 RC 방전과 펄스구동의 효과
탁현석(Hyun-Seok Tak),신승열(Seung-Yul Shin),강명창(Myung-Chang Kang),하창승(Chang-Seung Ha),이호준(Ho-Jun Lee),이대열(Dae-Yeol Lee) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
This paper described the effect of RC discharging and pulse generation for micro-EDM of micro-hole fabrication with Al₂O₃/CNTs hybrid nanocomposites. Alumina matrix composites reinforced with CNTs were fabricated by CNT purification, mixing, compaction and sintering processes. Al₂O₃ nanocomposites with different CNT concentrations were successfully synthesized. The mechanical and electrical characteristics of Al₂O₃/CNTs composites were examined in order to evaluate machining characteristics. The pulse driven circuit was newly designed to evaluate the machining property using RC discharge and pulsed generator. Characterization of machined micro holes was conducted by Field Emission Scanning Electron Microscope (FE-SEM) after actual RC Discharged EDM and pulse driven EDM, respectively.
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.