Recently, the use of tubes in the manufacturing of the automobile parts has increased and therefore many automotive manufactures have tried to use hydro-forming technology. The hydro-forming technology may cause many advantages to automotive applications in terms of better structural integrity of the parts, lower cost from fewer part count, material saving, weight reduction, lower spring-back, improved strength and durability and design flexibility. In this study, the whole process of sub-frame parts development by tube hydro-forming using steel material is presented. At the part design stage, it requires feasibility study and process design aided by CAE (computer aided design) to confirm hydro-formability in details. Overall possibility of hydro-formable sub-frame parts could be examined by cross sectional analyses. All the components of prototyping tools are designed and interference with press is examined from the point of geometry and thinning.

ABSTRACT
 1. 서론
 2. 부품 설계
  2.1 기존모델 및 하이드로포밍 설계 모델
  2.2 하이드로포밍 압력 계산
 3. 해석결과 및 고찰
 4. 결론
 References

• 김기주(Tongmyung University) | Kee-Joo Kim Corresponding Author