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김상오,유만희,곽재섭,Kim, Sang-Oh,You, Man-Hee,Kwak, Jae-Seob 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
The magnetic abrasive polishing (MAP) process is used to achieve the nano-meter grade polishing results on flat or complicated surface. In previous study, polishing the stainless steel plate which is a non-magneto-material was tried. To polish non-magneto-materials using the MAP process was very difficult because the process was fundamentally possible by the help of a magnetic force. Therefore, it had lower efficiency than magneto-materials such as SM45C. In this study, optimization for tool geometry of the MAP was performed to improve the magnetic force between tool and workpiece. Moreover, a permanent magnet was installed below the non-magneto-material to improve the magnetic force. And then the design of experiments was carried out to evaluate the effect of the MAP parameters on the polishing results.
평면과 경사면의 자기연마가공에서 공정변수가 표면거칠기에 미치는 영향
김상오(Sang-Oh Kim),유만희(Man-Hee You),곽재섭(Jae-Seob Kwak) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.4
R/In order to satisfy the customer's variant needs for a product quality in recent years, a demand for developing higher precision machining technologies in a lot of application areas such as automobile, cellular phone and semiconductor has been increased more and more. Magnetic abrasive polishing(MAP) process is one of these precision technologies. In this study, to verify the parameters' effect of the MAP process on the surface roughness improvement of the plane and the inclined workpiece, well planned experiments which was called the design of experiments were carried out. Considered polishing factors were spindle speed, supplied current, abrasive type and working gap between the workpiece and the solid tool. As a result, it was seen that the supplied current and the working gap greatly affected the surface roughness improvement.
Pre-Polymer의 제조에서 공정변수가 잔류 NCO 및 점도에 미치는 영향
김상오(Sang-Oh Kim),유만희(Man-Hee You),하만경(Man-Kyung Ha),곽재섭(Jae-Seob Kwak) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.3
For the production of urethane prepolymer, the effect of process parameters such as diisocyanate MDI and polyol TDI was tested. In this paper, design of experiments has been adopted for studying the effect of the process parameters on the improvement of NCO and viscosity of pre-polymer. As a result of comparison of different parameters, the effect of polyol was stronger than that of isocyanate in comparison of reactivity according to the amounts of isocyanate and polyol. Especially, NCO and viscosity of pre-polymer affected a product safety.
자동차 부품 BRACKET의 Checking Fixture 검사구 개발
백승범(Seung-Bum Baek),유만희(Man-Hee You),김상오(Sang-Oh Kim),곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
It is impossible to check the product during manufacturing process by using previous measuring method. However checking fixture can do that and save the working time and cost. In this study, checking fixture was developed through the 3D modeling, CNC manufacturing process, precision geometry test. Gap of 3mm was adopted to reduce the deformation of product. Optimized tool parameter was determined as 1500rpm of tool speed, 2000㎜/min of feed speed and 1500rpm of shaft spindle speed by using NC software.
김상오(Sang-Oh Kim),유만희(Man-Hee You),곽재섭(Jae-Seob Kwak) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.3
The magnetic abrasive polishing (MAP) process is used to achieve the nano-meter grade polishing results on flat or complicated surface. In previous study, polishing the stainless steel plate which is a non-magneto-material was tried. To polish non-magneto-materials using the MAP process was very difficult because the process was fundamentally possible by the help of a magnetic force. Therefore, it had lower efficiency than magneto-materials such as SM45C. In this study, optimization for tool geometry of the MAP was performed to improve the magnetic force between tool and workpiece. Moreover, a permanent magnet was installed below the non-magneto-material to improve the magnetic force. And then the design of experiments was carried out to evaluate the effect of the MAP parameters on the polishing results.
휴리스틱 알고리즘을 이용한 평면 자기연마 공구경로 최적화
김상오(Sang-Oh Kim),유만희(Man-Hee You),곽재섭(Jae-Seob Kwak) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.2
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.
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.
자동차 부품 BRACKET의 Checking Fixture 검사구 개발
백승범(Seung-Bum Baek),유만희(Man-Hee You),김상오(Sang-Oh Kim),곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
It is impossible to check the product during manufacturing process by using previous measuring method. However checking fixture can do that and save the working time and cost. In this study, checking fixture was developed through the 3D modeling, CNC manufacturing process, precision geometry test. Gap of 3mm was adopted to reduce the deformation of product. Optimized tool parameter was determined as 1500rpm of tool speed, 2000mm/min of feed speed and 1500rpm of shaft spindle speed by using NC software.
자유곡면을 갖는 금형의 자기연마가공특성 평가에 관한 연구
김상오(Sang-Oh Kim),유만희(Man-Hee You),박자연(Ja-Yeon Park),하만경(Man-Kyung Ha),곽재섭(Jae-Seob Kwak) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Magnetic Abrasive Polishing(MAP) process is one of these precision technologies. In the MAP process, miniaturized abrasives are scattered over the workpiece surface in advance, and then direct current source is applied to an inductor which is attached to a main spindle of machine tools. The induced magnetic force plays an important role not only in the formation of a flexible abrasive brush but also in developing abrasion pressure. Owing to the property of used machine tool is very flexible, the better surface of the mold can be obtained from the MAP process.
김상오(Sang-Oh Kim),하만경(Man-Kyong Ha),곽재섭(Jae-Seob Kwak),이용철(Yong-Chul Lee),박후명(Hoo-Myong Park),유만희(Man-Hee you) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The application of magnetic field in control of manufacturing process has become of interest in recent past. In magnetic abrasive polishing process, magnetic force plays a dominant role in the formation of flexible abrasive brush and developing abrasion pressure. So, in recent study, magnetic abrasive polishing is applied in the inner pipe polishing, micro burr deburring process and free surface mold polishing. This paper identifies the parameters of μ-MIP(micro magnetic induced polishing) that significantly affect the surface roughness when a magnetic field is applied around the workpiece. Design of experiments has been adopted for studying the effect of μ-MIP parameters.