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

Process Analysis of Elbow-shaped Tubes using a Mandrel

맨드렐을 이용한 엘보우 성형 공정해석

  • 오일영 (기계공학부 정밀가공시스템전공, 부산대학교) ;
  • 박성환 (기계공학부 정밀가공시스템전공, 부산대학교) ;
  • 박준영 (기계공학부 정밀가공시스템전공, 부산대학교) ;
  • 이성훈 (기계공학부 정밀가공시스템전공, 부산대학교) ;
  • 이의용 (품질보증팀, (주)에스티밴드) ;
  • 문영훈
  • Received : 2016.09.08
  • Accepted : 2017.01.16
  • Published : 2017.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, process analysis of elbow-shaped tubes using a mandrel has been performed. To reach the final shape within the dimensional tolerance, the process analysis has been performed at various processing parameters such as tube dimensions, the curved cutting surface and the radius of curvature. The area outside the boundary of the target shape was expressed as a quantitative index to analyze the formability. The validation experiments have also been performed in order to increase the reliability of the process analysis. For the processing of elbow-shaped tubes, it is preferable to make the angle of the portion where the punch touches the tube smaller than the opposite angle. And the convex cutting surface is advantageous due to the increased contacts between the punch and the tube ends during the bending process. Elbow tube having larger radius of curvature shows higher dimensional accuracy due to the relatively uniform strain distribution.

Keywords

References

  1. H. Yang, Z. C. Sun, Y. Lin, 2001, Advanced Plastic Processing Technology and Research Progress on Tube Forming, J. Plast. Eng., Vol. 8, No. 2, pp. 83-85.
  2. H. YANG, H. Li, Z. Zhang, M. Zhan, J. Liu, G. Li, 2012, Advances and Trends on Tube Bending Forming Technologies, Chin. J. Aeronaut., Vol. 25, No. 1, pp. 1-12. https://doi.org/10.1016/S1000-9361(11)60356-7
  3. F. Chinesta, E. Cueto, 2007, Advances in Material Forming: Esaform 10 Years on, Springer Sci. & Bus. Media, pp. 175-191.
  4. F. Vollertsen, A. Sprenger, J. Kraus, 1999, Extrusion, Channel, and Profile Bending: a Review, J. Mater. Process. Technol., Vol. 87, No. 1-3, pp. 1-27. https://doi.org/10.1016/S0924-0136(98)00339-2
  5. H. Li, H. Yang, 2011, A Study on Multi-defect Constrained Bendability of Thin-walled Tube NC Bending under Different Clearance, Chin. J. Aeronaut., Vol. 24, No. 1, pp. 102-112. https://doi.org/10.1016/S1000-9361(11)60013-7
  6. H. Yang, H. Li, M. Zhan, 2010, Friction Role in Bending Behaviors of Thin-walled Tube in Rotary-draw-bending under Small Bending Radii, J. Mater. Process. Technol., Vol. 210, No. 15, pp. 2273-2284. https://doi.org/10.1016/j.jmatprotec.2010.08.021
  7. A. Kami, B. M. Dariani, 2011, Prediction of Wrinkling in Thin-walled Tube Push-bending Process using Artificial Neural Network and Finite Element Method, Proc. Inst. Mech. Eng., Part B: J. Eng. Manuf., Vol. 225, No. 10, pp. 1801-1812. https://doi.org/10.1177/0954405411404300
  8. Y. Zhang, D. Redekop, 2006, Shell Element Simulation of the Push Method of Tube Bending, J. Achiev. Mater. Manuf. Eng., Vol. 17, No. 1-2, pp. 301-304.
  9. M. Goodarzi, T. Kuboki, M. Murata, 2007, Effect of Initial Thickness on Shear Bending Process of Circular Tubes, J. Mater. Process. Technol., Vol. 191, No. 1, pp. 136-140. https://doi.org/10.1016/j.jmatprotec.2007.03.007
  10. N. Ren, M. Zhan, H. Yang, Z. Y. Zhang, Y. T. Qin, H. M. Jiang, X. P. Chen, 2012, Constraining Effects of Weld and Heat-affected Zone on Deformation Behaviors of Welded Tubes in Numerical Control Bending Process, J. Mater. Process. Technol., Vol. 212, No. 5, pp. 1106-1115. https://doi.org/10.1016/j.jmatprotec.2011.12.023