한국소성가공학회:학술대회논문집 (Proceedings of the Korean Society for Technology of Plasticity Conference)
- 한국소성가공학회 2008년도 춘계학술대회 논문집
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- Pages.325-328
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- 2008
튜브 액압성형품의 공정단계별 가공 경화 특성 연구
A Study on the strain hardening of tube hydroforming according to process
- Park, H.K. ;
- Yim, H.S. ;
- Yi, H.K. ;
- Jeon, D.H. ;
- Moon, Y.H.
- 발행 : 2008.05.08
초록
In recent years, developments of light weight vehicle are one of the most important issues in automotive industry. It is important to know the variations of the mechanical properties in the hydro forming process for the safe and durable design purposes. Generally, tube hydroforming process consists of three main processes such as bending, preforming, and hydroforming. It means that the strain hardening histories of final products are nonlinear. In this study, strain hardening behavior during hydroforming has been investigated by hydroforming of engine cradle as a model process. The variation of mechanical properties such as local hardness and strength were used as an index of strain hardening during respective processes. The correlationship between strength and hardness obtained from tensile test has been equivalently converted into correlation between hardness and measured strain.