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주병돈(Byeong-Don Joo),이성문(Sung-Mun Lee),손영명(Young-Myung Son),문영훈(Young-Hoon Moon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Hydroforming technology draws attentions of automotive industries due to its advantages such as weight reduction, increased strength, improved quality and reduced tooling cost. Hydroformed automotive parts used as structural components in vehicle body frame often have to be structurally joined at some point. Therefore it is useful if the hydroformed automotive parts can be given a localized attachment flange. In this study, hydroforming process for the flanged tubular parts was proposed. Tube hydroforming experiments were conducted at various conditions. Forming characteristics at various pressure conditions were evaluated. With optimized condition flange was sucessfully formed. The results show that flanged automotive parts can be successfully produced with tube hydroforming.
Fe-Ni-Cr 코팅층 형성을 위한 SLS 공정변수의 최적화
주병돈(B. D. Joo),장정환(J. H. Jang),임홍섭(H. S. Yim),손영명(Y. M. Son),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Selective laser sintering(SLS), a kind of rapid prototyping technology, can provide a process to form many types of coatings. Coated layers by selective laser melting are highly influenced by substrate, powder and laser parameters such as laser power, scan rate, fill spacing and layer thickness. Therefore an attempt to fabricate Fe-Ni-Cr coating on AISI H13 tool steel has been performed by selective laser sintering. In this study, Fe-Ni-Cr coating was produced b experimental facilities consisting of a 200W fiber laser which can be focused to 0.08mm and atmospheric chamber which can control atmospheric pressure with Ar. With power increase or energy density decrease, line width was decreased and line surface quality was improved with energy density increase. Surface quality of coating layer was improved with fill spacing optimization or layer thickness decrease.