Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
권호 표지
DOI QR코드

DOI QR Code

Hydroforming Characteristics of Double Layered Tube

이중튜브의 액압 성형특성 연구

  • 권승오 (부산대학교, 정밀기계공학과) ;
  • 이혜경 (부산대학교, 정밀기계공학과) ;
  • 정기석 (포스코, 자동차 가공연구 그룹) ;
  • 문영훈 (부산대학교 기계공학부)
  • Published : 2007.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Double layered tube is assembled with an inner tube and an outer tube, similar in material or not, contacting closely and deforming simultaneously when subjected to external force. For the manufacturing of double layered tube, the hydroforming assembly technology has several advantages. Therefore in this study, hydroforming characteristics of double layered tube was investigated. The free bulge test was performed to produce formability diagrams of double layered tubes at various forming pressure and feeding amounts. The hexagonal shape hydroforming test was also performed to estimate the dimensional accuracies of double layered tube through the corner filling ratio and the gap between inner and outer tube. Besides experimental analyses, the analytical model that can predict internal pressure for the hydroforming of double-layered tube was proposed and experimentally validated.

Keywords

References

  1. K. Kolowrocki, 2003, Asymptoric approach to reliability evaluation of large multi-state systems with application to piping transportation, Int. J. Pressure Vessels and Piping, Vol. 80, pp. 59-73 https://doi.org/10.1016/S0308-0161(02)00062-5
  2. J. L. Alcaraz, J. Gil-sevillano, 1996, An analysis of the extrusion of Bimetallic tubes by numerical simulation, Int. J. Mech. Sci. Vol. 38, No.2, pp. 157-173 https://doi.org/10.1016/0020-7403(95)00044-X
  3. H. Wright, T. Oduyemi, H.R. Evans, 1991, The experimental behavior of double skin composite element. J. Construct steel research, Vol. 19, pp. 91-110
  4. J. L. Alcaraz, J. Gil-Sevillano, J. M. Martinez-Esnaola, 1996, A fracture condition based on the upper bound method for the extrusion of bimetallic tubes, J Material process technology, Vol.61, No.3, pp. 265-274 https://doi.org/10.1016/0924-0136(95)02186-8
  5. X. Gomez, J. Echeberria, 2003, Microstructure and mechanical properties of carbon steel A210-supperalloy Sanicro 28 bimetallic tubes, Material science engineering, Vol.348, No.1-2, pp. 180-191 https://doi.org/10.1016/S0921-5093(02)00686-X
  6. F. Dohmann, Ch. Hartl, 1997, Tube hydrofroming - research and practical application, Journal of Materials Processing Technology, Vol. 71, pp. 174- 186 https://doi.org/10.1016/S0924-0136(97)00166-0
  7. G. Morphy, 1998, Hydroforming : Dimensional capability analysis of a high-volume automotive structural component production process, SAE Transaction, Vol. 107, pp. 298-307
  8. G. T. Kridli, L. Bao, P. K. Mallick, Y. Tian, 2003, Investigation of thickness variation and corner filling in tube hydroforming, Journal of Materials Processing Technology, Vol. 133, pp. 287-296 https://doi.org/10.1016/S0924-0136(02)01004-X
  9. F. Liu, J. Zheng, P. Xu, M. Xu, G. Zhu, 2004, Forming mechanism of double layered tubes by internal hydraulic expansion, International Journal of Pressure Vessels and Piping, Vol. 81, pp. 625-633 https://doi.org/10.1016/j.ijpvp.2004.03.014
  10. 김영석, 손현성, 한수식, 2002, 튜브 하이드로포밍 공정에서의 마찰특성에 관한 연구, 한국소성가공학회지, Vol. 11. No.6, pp. 475-481

Cited by

  1. Enhancement of Hydroformability Through the Reduction of the Local Strain Concentration vol.23, pp.5, 2014, https://doi.org/10.5228/KSTP.2014.23.5.317