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최병기,이동길,최병희,Choi, Byung-Ky,Lee, Dong-Gil,Choi, Byung-Hui 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.3
Metal Injection Molding (MIM) is attractive because it produces consistent, complex-geometry components for high-volume, high-strength, and high-performance applications. Also MIM using in optical communication field, display field, and semi-conductor field is a cost-effective alternative to metal machining or investment casting parts. It offers tremendous single-step parts consolidation potential and design flexibility. The objective of this paper is to study the suitability of design, flow analysis, debinding and sinterin processes, and capability analysis. The suitable injection conditions were 0.5~1.5 second filling time, 11.0~12.5 MPa injection pressure derived from flow analysis. The gravity of the product is measured after debinding an sintering. The maximum and minimum gravity levels are 7.5939 and 7.5097. the average and standard deviation are 7.5579 and 0.0122; when converted into density, the figure stands at 98.154%. According to an analysis of overall capacity, PPM total, which refers to defect per million opportunities(DPMO), stands at 166,066.3 Z.Bench-the sum of defect rates exceeding the actual lowest and highest limits-is 0.97, which translates into the good quality rate of around 88.4% and the sigma level of 2.47.
LPI엔진의 인젝터 클리닝이 배기가스에 미치는 영향 연구
김만재 ( Man-jae Kim ),홍성인 ( Sung-in Hong ),최병기 ( Byung-ky Choi ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.3
Domestic vehicles using LPG as a fuel are decreased. In Europe and the advanced country, support from governments has been made because vehicles using LPG are classified as alternative fuel vehicles. Fuel supply system of vehicles using LPG uses the same method as in gasoline engines. This experiments were carried out the vehicle exhaust gas inspection method enforced by the Korea Transportation Safety Authority. Exhaust gas(HC, CO, NOx) of LPI vehicles was analyzed the generated component of the before and after of injector cleaning. Exhaust gas of LPI vehicles using LPG was analyzed the impact on the environment.
김만재 ( Man-jea Kim ),김태중 ( Tae-jung Kim ),최병기 ( Byung-ky Choi ) 조선대학교 공학기술연구원 2018 공학기술논문지 Vol.11 No.4
Exhaust gas from the combustion of automobiles adversely affects the human body and even pollutes the atmosphere. This study investigated the influence of exhaust gas change on intake manifold using the nozzle. First, the flow analysis was performed using the 3D flow analysis program. When the nozzle inlet air velocity increased, the average air velocity in the nozzle diameters of Φ2.5 and Φ5 increased 37.3% and 31.9% respectively at the intake manifold outlet. As the nozzle inlet air velocity increased, the maximum flow rate of air increased to 42.2% and 32.6%, respectively at nozzle diameters of Φ2.5 and Φ5. In order to verify the analysis results, experiments on the exhaust gas were performed in the engine simulation system. As the nozzle inlet velocity increased, HC values decreased by 42.4% and 31.4% at nozzle diameters of Φ2.5 and Φ5, respectively. And CO values decreased by 40.7% and 31.1% at nozzle diameters of Φ2.5 and Φ5.