Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Effect of Loading Path on the Hydroformability of a Three-layered Tube for Fabrication of a Hollow Part

중공품 성형시 삼중관의 액압성형성에 미치는 압력경로의 영향

  • Han, S.W. (School of Mechanical Engineering, Pusan National University) ;
  • Kim, S.Y. (School of Mechanical Engineering, Pusan National University) ;
  • Joo, B.D. (School of Mechanical Engineering, Pusan National University) ;
  • Moon, Y.H. (ERC/Net Shape Die Manufacturing, Pusan National University)
  • Received : 2012.12.19
  • Accepted : 2013.01.22
  • Published : 2013.02.01
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Abstract

Tube hydroforming is a technology that utilizes hydraulic pressure to form a tube into desired shapes inside die cavities. Due to its advantages, such as weight reduction, increased strength, improved quality, and reduced tooling cost, single-layered tube hydroforming is widely used in industry. However in some special applications, it is necessary to produce multi-layered tubular components which have corrosion resistance, thermal resistance, conductivity, and abrasion resistance. In this study, a hollow forming process to fabricate a part from multi-layered tubes for structural purposes is proposed. To accomplish a successful hydroforming process, an analytical model that predicts optimal load path for various parameters such as tube material properties, thickness of tubes, diameter of holes and the number of holes was developed. Tubular hydroforming experiments to fabricate a hollow part were performed and the optimal loading path developed by the analytical model was successfully verified. The results show that the proposed hydroforming process can effectively produce hollow parts with multi-layered tube without defects such as wrinkling or fracture.

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References

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