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초내열 합급 배기 밸브 스핀들 단조 해석 및 기계적 특성평가
최성규(S. G. Choi),오중석(J. S. Oh),정호승(H. S. Jeong),조종래(J. R. Cho) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
The nickel-based alloy Nimonic 80A possesses strength, and corrosion, creep and oxidation resistance at high temperature. The exhaust valves of low speed diesel engines are usually operated at temperature levels of 400-600℃ and high pressure to enhance thermal efficiency and exposed to the corrosion atmosphere by the exhaust gas. Also, the exhaust valve is subjected to repeated thermal and mechanical loads. So, the nickel-based alloy Nimonic 80A was used for the large exhaust valve spindle. It is composed a 540mm diameter head and a 125mm diameter stem. It is developed large products by hot closed-die forging. Manufacturing process analysis of the large exhaust valve spindle was simulated by closed die forging with hydraulic press and cooled in air after forging. The preform was heated to 1080℃. Numerical calculation was performed by DEFORM-2D, a commercial finite element code. Heat transfer can be coupled with the deformation analysis in a non-isothermal deformation analysis. Mechanical properties of the large exhaust valve spindle were evaluated by the variety of tests, including microstructure observation, tensile, as well as hardness and fatigue tests, were conducted to evaluate the mechanical properties for head part of exhaust valve spindle.
최성규(S K Choi),박정원(J W Park),최성진(S J Choi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In recent years, There are many consumer needs and safety regulations for high performance vehicles. For this reason, Various stability assessments are being performed to meet the regulations for the suspension corner module impact tests. The objective of side Impact Test for the suspension corner module is to assess the vehicle stability caused by unstable driving conditions such as Kerb Strikes. Side Impact Test has been performed on the full vehicle condition so far. Recently, Some components and module manufacturers are making an effort to develop the proper impact test facility for suspension corner module. In this research, experimental assessments were carried out on the suspension corner module using newly designed and manufactured impact test facility through the benchmarking of the existing Impact test facility of automobile maker Adding to this, we modelled the impact test facility and suspension corner module using Finite Element Software to correlate analytical results with experimental to verify the reliability of analytical approaches.
정호승(H. S. Jeong),손창우(C. W. Son),오중석(J. S. Oh),최성규(S. K. Choi),조종래(J. R. Cho) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
The two aims of this study are first, determining the optimal friction welding process parameters by using the finite element simulation and second, evaluating the mechanical properties of friction welded part for manufacturing large piston rod in marine diesel engine. Friction welding was carried out with optimal process parameter conditions obtained from the simulation results. The base material used in the investigation was AISI 4140 with an outer diameter of 280mm and an inner diameter of 160mm. In the study, the various tests, including microstructure observation, tensile, hardness, and fatigue tests, were conducted to evaluate the mechanical properties for friction welded joint part.