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곽태경,김상오,곽재섭,Kwak, Tae-Kyung,Kim, Sang-Oh,Kwak, Jae-Seob 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
Automated magnetic abrasive polishing which can be applied after machining of the mold on a machine tool without unloading is very effective for finishing a complicated injection mold surface. This study aims to realize one step polishing of free form surface with the same machine tool. For this purpose, magnetic flux density according to the change of curvature radii was simulated for selecting polishing conditions and experimental verification was performed with a complicated mold of aluminum alloy. As a result, it was seen by the simulation that the magnetic flux density at a gradual curvature of the mold was higher than at a steep curvature and the higher magnetic flux density produced the better surface roughness in the experimentation. The deviation for the surface roughness of the mold decreased on the whole and the uniform mold surface was obtained after the automated magnetic abrasive polishing.
곽태경(Tae-Kyung Kwak),김상오(Sang-Oh Kim),곽재섭(Jae-Seob Kwak) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.4
Automated magnetic abrasive polishing which can be applied after machining of the mold on a machine tool without unloading is very effective for finishing a complicated injection mold surface. This study aims to realize one step polishing of free form surface with the same machine tool. For this purpose, magnetic flux density according to the change of curvature radii was simulated for selecting polishing conditions and experimental verification was performed with a complicated mold of aluminum alloy. As a result, it was seen by the simulation that the magnetic flux density at a gradual curvature of the mold was higher than at a steep curvature and the higher magnetic flux density produced the better surface roughness in the experimentation. The deviation for the surface roughness of the mold decreased on the whole and the uniform mold surface was obtained after the automated magnetic abrasive polishing.
초정밀 자기연마 공정에 탄소나노튜브 입자의 적용에 관한 연구
곽태경(Tae-Kyung Kwak),곽재섭(Jae-Seob Kwak) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.3
In this study, new abrasives that were composed of iron powder and carbon nanotube (CNT) particle were attempted to be abrasives for magnetic abrasive polishing. Because the CNT particles itself are very small ones with high hardness and magnetic strength, these properties are effective for magnetic abrasive polishing of nonmagnetic materials. As an experimental result for evaluating the machining characteristics in magnetic abrasive polishing, the CNT particles showed better performance than the conventional abrasives such as Fe and CBN powder.
마이크로 밀링과 자기디버링을 적용한 마이크로 유동채널 가공
곽태경(Tae-Kyung Kwak),곽재섭(Jae-Seob Kwak) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.8
본 연구는 마이크로 머시닝을 적용한 유동채널가공에서 버의 발생과 제거에 관한 연구이다. AISI316 스테인리스강의 마이크로 유동채널가공은 마이크로 밀링과 자기 디버링을 결합하여 실시하였다. 먼저 마이크로 밀링으로 유동채널을 가공하였고, 가공조건에 따라 마이크로 채널주변에 미소 버가 생성됨을 확인하였다. 미소 버를 제거하기 위해서 자기 디버링을 행하였다. AISI316 스테인리스강은 비자성체로 자기연마에 큰 영향을 미치는 자속밀도가 매우 낮은 금속이다. 본 연구에서는 공작물의 자속 밀도를 향상시키기 위해서 자기 테이블을 개발하여 이를 자기연마 디버링에 적용하였고, 주사전자현미 경(SEM)과 표면형상기로 자기 디버링에 의한 버의 제거효과를 측정하였다. This study aims to verify burr formation and to remove the burrs in micro-channel fabrication using micro-machining tools. The machining processes are combined with micro-milling and magnetic abrasive deburring for AISI316 stainless steel. Depending on the micro-milling conditions that are applied, burrs are formed around the side walls. Magnetic abrasive deburring is used to remove these burrs. AISI316 stainless steel is a nonferrous material and its magnetic flux density, which is an important parameter for efficient magnetic abrasive deburring is low. To enhance this magnetic flux density, we design and build a magnetic array table. The effect of removing burrs is evaluated via SEM and a surface tester.
마이크로 밀링과 자기디버링을 적용한 마이크로 유동채널 가공
곽태경(Tae-Kyung Kwak),박자연(Ja-Yeon Park),곽재섭(Jae-Seob Kwak) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study aims to verify burr formation and remove the burrs in micro-channel fabrication using micro-machining tools. The machining processes are combined with micro milling and magnetic abrasive deburring for AISI316 stainless steel. Depending on the micro milling conditions that are applied in advance to the magnetic abrasive deburring, burrs around the side walls are formed. In order to remove the burr, the magnetic abrasive deburring is adopted. The AISI316 stainless steel is a non-ferrous material and its magnetic flux density which is a dominant parameter for the better magnetic abrasive deburring is very low. To enhance the magnetic flux density of deburring of the AISI316 stainless steel, a magnetic array table is designed and fabricated. The effect of removing burrs is evaluated by a SEM and a surface tester.
초정밀 자기연마 공정에 탄소나노튜브 입자의 적용에 관한 연구
곽태경(Tae-Kyung Kwak),곽재섭(Jae-Seob Kwak) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
This study focuses on the usefulness of the CNT as abrasive particles in magnetic abrasive polishing process. As a experimental result, the CNT abrasives affect improvement of surface roughness in the magnetic abrasive polishing process. According to this result, it is indicated that the CNT is appropriate to nano-order scale polishing.
자기력 분포에 따른 자유곡면의 자기연마 특성에 관한 연구
곽재섭(Jae-Seob Kwak),곽태경(Tae-Kyung Kwak),김태희(Tae-Hui Kim),강한성(Han-Sung Kang),최해운(Hae-Un Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This study aimed to develop a magnetic array table and control the polarity of electro-magnets so that the magnetic force could be increased for the magnetic abrasive polishing (MAP) of free form surface. The distribution of the magnetic flux density according to the configuration of the electro-magnets under the workpiece was simulated and the improvement of the surface roughness was verified in the MAP experiments of free form surface.