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Abrasive Film Polishing을 이용한 SUS-304의 표면거칠기·잔류응력 분석
신봉철,김병찬,임동욱,민경호,Shin, Bong-Cheol,Kim, Byung-Chan,Lim, Dong-Wook,Min, Kyung-Ho 한국금형공학회 2018 한국금형공학회지 Vol.12 No.2
Recently, as the demand for high-precision parts increases due to industrial development, a machine tool system for ultra-precision machining and polishing has been actively developed. As a result, there is an increasing demand for ultra-precision surface roughness along with dimensional processing. However, due to the increase in processing time due to the demand for ultra-precise surfaces and enormous facility investment, it is difficult to secure competitiveness. The polishing process using the abrasive film in super precision machining has been applied to machines, electronic devices, aerospace, and medical fields. Super finishing using the abrasive film which is applied in the industrial field recently can achieve high surface roughness in a short time. Super finishing using the abrasive film which is applied in the industrial field recently can achieve high surface roughness in a short time. Also, application of industrial field is increasing due to advantages such as low noise and low dust. Recently, researches on stainless steel having strong resistance to corrosion, heat resistance, heat resistance, toughness and weldability have been actively conducted with respect to the nuclear energy industry or marine development. Therefore, in this study, surface roughness and residual stress were measured after SUS304 polishing using dynamic analysis of film polishing apparatus and polishing film.
MR Fluid Polishing을 이용한 Co-Cr-Mo alloy의 초정밀 연마 방법
신봉철,김병찬,송기혁,조명우,Shin, Bong-Cheol,Kim, Byung-Chan,Song, Ki-Hyeok,Cho, Myeong-Woo 한국금형공학회 2017 한국금형공학회지 Vol.11 No.3
In general, metallic bio-materials is more widely used in solid tissue like bone or tooth than flexible tissue such as skin or muscle. Especially, Cobalt Chrome Molybdenum(Co-Cr-Mo), which is used in tooth surgery, has a great corrosion resistance. Because this bio-material is non-toxic in human body, and has a bio-compatibility that the vital reaction is not occurred with tissue in body. However the chemical reaction is occurred by fatal matter that deteriorate the property of material surface in conventional polishing, and it can affect to fatal disease in human body or decrease the material properties such as hardness, yield strength or bio-compatibility. This surface in poor condition can cause development of corrosion or bacteria. In this study, MR fluid polishing is used to minimize the scratch, pit or surface flaws generated in conventional polishing. Surface roughness is measured according to the polishing condition to obtain fine surface condition.
DMD를 이용한 LDI 시스템의 미세패턴 생성을 위한 최적의 초점거리에 대한 연구
신봉철(Bong Cheol Shin),조용규(Yong Kyu Cho),하석재(Seok Jea Ha),김규복(Kyu Bok Kim),조명우(Myeong Woo Cho) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Recently, LDI(laser direct imaging) technoloy is being researched to make micro circuit pattern. In this study, LDI system was developed using DMD(digital micromirror device) and experiment of pattern generating according to focal length was perfomed. Generated noncontinuous pattern due to gap of DMD was changed to continuous pattern by control of focal length. Width of pattern was increased by defocusing. Therefore, optimal focal length was selected by measurement of profile. As a result, optimal focal length was selected location of 120μm away from focus.
신봉철(Shin, Bong-Cheol),김건희(Kim, Gun-Hee),김재철(Kim, Jae-Cheol),조명우(Cho, Meyong-Woo) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.1
본 논문에서는 고품질·고기능성이 요구되는 카메라폰용 카메라 모듈의 주요 부품인 초소형 플라스틱 barrel, base의 조립 토크 편차 저감을 위하여 금형 코어, 전극 및 사출성형품의 나사 형상의 주요 기하를 정밀하게 측정할 수 있는 시스템을 개발하였다. 해당 공정을 실현하기 위하여 품질 평가의 주요 측정 파라메터를 선정하고 측정 방법을 개발하였으며, 최종적으로 현장 적용이 가능한 전용 측정 시스템을 개발하였다. In this paper, for reducing the assembly torque of subminiature plastic barrel and base which are the essential parts of mobile phone camera module, the high-precision system for inspecting the screw shape of core, electrode and injection molding products was developed. For realiztion of inspection process, the inspection parameters for evaluating the manufacturing quality were selected and the measurement methods of selected parameters were developed. Finally, the inspection system which is possible to be applied to the field were fabricated.
신봉철(Bong-Cheol Shin),하석재(Seok-Jae Ha),강민형(Min-Hyung Kang),권오양(Oh-Yang Kwon),조명우(Myeong-Woo Cho) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.10
In recent, the CFRP(Carbon Fiber Reinforced Plastics) composite has been widely used because it has light-weight and high mechanical strength. Therefore, CFRP composite is applied to variable industrial areas such as aerospace, automobiles, sporting goods, ships and so on. Generally, CFRP composite has been used in the industrial field by mechanical cutting processes. In this research, the CFRP composite specimen are laminated by 64plies with orientation angles such as 0°, 45°, 90° and [0°/±45°/90°]4S. The results are analyzed with cutting force and cutting surface.
임동욱,김지훈,신봉철,Lim, Dong-Wook,Kim, Ji-Hun,Shin, Bong-Cheol 한국금형공학회 2018 한국금형공학회지 Vol.12 No.1
Both injection and injection molding dies have evolved into advanced technology. Product quality is also evolving day after day. Therefore, the conditions of the injection mold and the injection conditions are becoming important. In order to improve the quality of the product, the Hardware part of the mold has developed as an advanced technology, and the Software part has also developed with advanced technology. This study deals with the cooling part, which is part of the hardware. In addition to fluid cooling, which is commonly used in the industry, by using gas cooling identify the phenomena that appear on the surface of the product and the critical point strain of the product to find the optimal cooling. Electronic parts and automobile parts whose surface condition is important, the cooling process is important to such a degree that they are divided with good products and defective products according to the cooling process at the time of injection. By controlling this important cooling and reducing the injection time with additional cooling, the product quality can be increased to the highest production efficiency. In addition, high efficiency can be achieved without additional investment costs. This study was conducted to apply these various advantages in the field.
유한요소법을 이용한 유압브레이커 Cylinder와 Piston의 열-구조 연성해석을 통한 안정성 평가
임동욱,박윤수,신봉철,Lim, Dong-Wook,Park, Yoon-Soo,Shin, Bong-Cheol 한국금형공학회 2018 한국금형공학회지 Vol.12 No.1
This study proves the causes of cylinder and piston jam by scratches which is the fatal problem of hydraulic breaker through the thermal analysis and thermal-structural coupled field analysis. The trouble from the scratch is a complex problem which can be caused by manufacturing process (this is an internal factor) and the users mistake or contamination in the hydraulic circuit (these are an external factor). Hence, it's not easy to investigate the causes, also hard to prevent the recurrence. In this reason, hydraulic breaker manufacturers are trying to improve the manufacturing process such as machining, heat treatment, grinding, cleaning, also to prevent the contamination in hydraulic circuit and to remove the remains. It's being managed thoroughly by manufacturers. This study shows the effect of the temperature rise by the frictional heat generated when the piston hits the tool on the hydraulic oil while the hydraulic breaker is operating, also the temperature distribution when it starts to affect main components of hydraulic breaker. The stress and the amount of deformation also could be found through thermal-structural coupled field analysis. It proved that the stress and deformation are proportionally increased according to the temperature rise in hit area, and it affects the cylinder and the viscosity of hydraulic oil inside the cylinder when it heats up beyond the certain temperature.
Maskless 노광공정을 위한 LDI(Laser Direct Imaging) 시스템 개발 및 단일 레이저 빔 에너지 분포 분석
이수진,김종수,신봉철,김동우,조명우,Lee, Soo-Jin,Kim, Jong-Su,Shin, Bong-Cheol,Kim, Dong-Woo,Cho, Meyong-Woo 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1
Photo lithography process is very important technology to fabricate highly integrated micro patterns with high precision for semiconductor and display industries. Up to now, mask type lithography process has been generally used for this purpose; however, it is not efficient for small quantity and/or frequently changing products. Therefore, in order to obtain higher productivity and lower manufacturing cost, the mask type lithography process should be replaced. In this study, a maskless lithography system using the DMD(Digital Micromirror Device) is developed, and the exposure condition and optical properties are analyzed and simulated for a single beam case. From the proposed experimental conditions, required exposure experiments were preformed, and the results were investigated. As a results, 10${\mu}m$ spots can be generated at optimal focal length.