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신세계로(S. G. R. Shin),주병돈(B. D. Joo),이철환(C. H. Lee),김동우(D. W. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Hydroforming technology has received an attention of the automotive industry because of its advantages compared to conventional manufacturing technologies. A wide range of products such as subframes, camshafts, radiator frames, axles and crankshafts are made by hydroforming process and the hydroformed parts often need to be structurally joined to other components during assembly. Therefore, it is useful if the hydroformed automotive parts can be manufactured with a localized attachment flange. In this study, hydroforming process for the flanged tubular parts was proposed. FE analysis to form flanged rectangular shape was preformed with Dynaform 5.5. With optimized condition, hydroforming experiments to form flange were performed. Forming characteristic at various tube properties conditions was analyzed and optimized internal pressure condition was evaluated. The results show that flanged parts can be successfully produced by tube hydroforming process.
Direct Laser Melting 공정시 차폐가스가 성형 특성에 미치는 영향
한상욱(S. W. Han),신세계로(S. G. R. Shin),신은경(E. K. Shin),이철환(C. H. Lee),문영훈(Y. H. Moon) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Direct Laser Melting process is a kind of prototyping process whereby a 3-D part is built layer wise by laser scanning the powder. This process is highly influenced by shielding gas and laser parameters such as laser power, scan rate, layering thickness and rescanning. Especially, shielding gas is important in evaluating the microstructure and mechanical properties. In this study, fabrication was carried out by experimental facilities consisting of a 200W fiber laser. Cylinder was fabricated by shielding gas atmosphere such as Air, Ar and N₂ with Fe-Ni-Cr powder to investigate forming characteristics. Although surface properties was improve, surface roughness was similar without significant change. In order to evaluate the formability, flow stress curves were analyzed. The microstructure is different by scan rate and rescanning.