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Al 6063 합금 중공각재 튜브에 의한 프레스 성형 연구
이정국(Choung-Kook Lee),김원중(Won-Jung Kim) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
In this study, a method for the press forming of rectangular aluminium tube has been proposed. Rectangular aluminium tube has high stiff as the cold steel which can be lighter over 30% weight. It is increased every year by being recycled over 80%. Press die consists of punch, wing-die and holder for aluminium tube bending. When punch is applied with aluminium tube, holder is operated as same punch and wing-die is rotated through hinge. Stress-strain relations and springback are considered by bending angle of aluminium tube. In this study, the behaviors on tubes of square aluminium and rectangular aluminium with different thickness and area are established by the analysis of DEFORMTM-3D program. Reducing fuel consumption is expected by using the aluminium tube deformation and it becomes the lightweight through recycling.
정주식(Ju-Sik Jung),이정국(Choung-Kook Lee) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.3
Gear is general mechanical elements that used for power transmission between two shafts that interval is comparatively short. And it delivers big power as accurate ratio of speed. The profile of Spur gear which is the most basic factor is divided into Trochoidal fillet curve and Involute curve. Involute curve is used a lot of a shaped curve of machine parts such as a gear, a scroll compressor and a collar of centrifugal pump. However, It is poor to study the modeling of Trochoidal fillet curve and the three dimensions model shaped mathematical curve. This paper describes a mathematical model of profile shifted involute gear. And this model is based on Camus s theory. We draw three dimensions gear have accurate mathematical function using ADS, VisualLISP. And To check accuracy and perfection, we make a program of checking Interference. And use for this study. Recently, as the rapid development in the industries, there occur erosion-corrosion damages due to the various corrosive environments.
자동차용 SGARC35강판의 판금도장 조건에 따른 표면조도와 스크래치 특성
박병훈(Byung-Hun Park),이정국(Choung-Kook Lee),왕철수(Cheol-Soo Wang) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.4
SGARC35 steel plate of 80mm length, 25mm width and 0.8mm thick were painted by solid, metallic and pearl paint, respectively. Solid, metallic and pearl paint were sprayed 1, 3, 5 time(s) as optimized painting conditions, respectively. Then, wash primer, primer surface and clear were regularly sprayed. Surface roughness and scratch tests were performed to investigate relations between adherence and surface roughness of painted coating. Surface roughness tests were carried out by electricity surface roughness meter. Scratch tests were regularly performed by Scratch tester at speeds of 3.1mm/min increasing load.