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자성 브러쉬의 조성변화에 따른 자기연마가공의 특성 평가
곽재섭(Jae-Seob Kwak),오창호(Chang-Ho Au),채영희(Young-Hui Chae),박원용(Won-Yong Park),김인관(In-Kwan Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
An ultimately precise surface in mechanical components can be easily produced by a magnetic abrasive polishing process. A tool in this process is unique one compared with other common machining processes. The magnetic abrasive polishing does not use a solid bulk typed tool but many small abrasives called a magnetic brush which have flexible movement from a machine body. According to the variation of brush composition such as abrasive type, grain size and mixing oil, final achievement of the magnetic abrasive polishing differs. This study shows experimental results in a magnetic abrasive polishing with different brush composition and effect of silicone gel mixing oil was examined.
상자성체의 자기연마에서 겔 자기연마 입자의 효율성 검증에 관한 연구
곽재섭(Jae-Seob Kwak),유만희(Man-Hee You),이성호(Sung-Ho Lee),강한성(Han-Sung Kang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Unbounded magnetic abrasives have been used in magnetic abrasive polishing because of low cost. However, these magnetic abrasives show machining efficiency in the negative, especially in a case of application in lower-permeability materials, since abrasives could easily break away from magnetic field according to increase of spindle speed. To solve this problem, in this study, silicone gel medium that is mixed with unbounded magnetic abrasives is applied for verifying the surface roughness improvement of paramagnet materials and preventing the chemical reaction on the working surface.
휴리스틱 알고리즘을 이용한 평면 자기연마 공구경로 최적화
곽재섭(Jae-Seob Kwak),김태희(Tae Hee Kim),김상오(Sang-Oh Kim) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
This paper focuses on the optimal step-over value for magnetic tool path. Since magnetic flux density is changed according to distance from center of magnetic tool. Enhanced surface roughness is also different according to change of radius. Therefore, to get a identical surface roughness on workpiece, it is necessary to find optimal tool path including step-over. In this study, response surface models for surface roughness according to change of radiuses were developed, and then optimal enhanced surface roughness for each radius was selected using genetic algorithm and simulated annealing to investigate relation between radius and surface roughness. As a result, it found that step-over value of 6.6mm is suitable for MAP of magnesium alloy.
휴리스틱 알고리즘을 이용한 평면 자기연마 공구경로 최적화
곽재섭(Jae-Seob Kwak),김태희(Tae Hee Kim),김상오(Sang-Oh Kim) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
This paper focuses on the optimal step-over value for magnetic tool path. Since magnetic flux density is changed according to distance from center of magnetic tool. Enhanced surface roughness is also different according to change of radius. Therefore, to get a identical surface roughness on workpiece, it is necessary to find optimal tool path including step-over. In this study, response surface models for surface roughness according to change of radiuses were developed, and then optimal enhanced surface roughness for each radius was selected using genetic algorithm and simulated annealing to investigate relation between radius and surface roughness. As a result, it found that step-over value of 6.6mm is suitable for MAP of magnesium alloy.
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.
헬리컬 기어의 최적 설계 프로그램 개발 및 3차원 모델링
곽재섭(Jae-Seob Kwak),정성원(Sung-Won Chung) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.2
Recently the studies on the vibration and the noise of a helical gear transmission have been focused on the many researchers. The manufacturing error and the deformation of the tooth profile, which generates the vibration and the noise of the gear transmission, are main factors. The major purpose of this study is to develop an optimal design program for reducing the vibration and the noise of the helical gear. To obtain the these results, we restrain the helical gear from the deformation of the tooth profile and increase the contact ratio within the optimal design program. Furthermore we made the three-dimensional solid modeling of the helical gear from the AutoCAD and the Pro/Engineer. This model will be available to generate the finite element model and the NC code.<br/>
Machining State Diagnosis in Grinding Using the Power Signals
곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha),구양(Yang Koo) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
A chatter vibration and a workpiece bum are the main phenomena to be monitored in modem grinding processes. This study describes a fault diagnosis of the cylindrical plunge grinding process using the power signals. The power raw signals occurred during the grinding operation were sampled and analyzed to determine the relationship between each fault and change of signals. A neural network that has a high success rate of the fault detection was used. Furthermore, an analysis on the influence of power parameters to the chatter vibration and the grinding burn was conducted.<br/>
입자 워터 젯의 이송속도가 공작물의 치수정밀도에 미치는 영향
곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha) 한국생산제조학회 2004 한국생산제조학회지 Vol.13 No.3
Abrasive water-jet(AWJ) machining can cut various materials such as metal, glass and plastics. However, the AWJ machining has some troubles including kerf, rounding and side taper. In this study, we experimently investigated the correlation between the traverse speed of the abrasive water-jet and the dimensional error of the workpiece according to the thickness and the types of the material. The specimen was the stainless steel and the mild steel and the predetermined contour cutting was conducted. A corner radius error, an uncut width and a kerf were measured and evaluated.