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Mechanism of Improvement of Formability in Pulsating Hydroforming of T-shape Tubes | ||
| AUT Journal of Modeling and Simulation | ||
| مقاله 5، دوره 42، شماره 1، تیر 2010، صفحه 29-35 اصل مقاله (2.74 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/miscj.2010.188 | ||
| نویسندگان | ||
| M. Loh-Mousavii؛ M. Bakhshi-Jooybariii؛ K. Moriiii | ||
| چکیده | ||
| In this paper, the mechanism of improvement of formability in pulsating hydroforming of T-shape tubes is investigated by the finite element simulation and experiment. It is shown that local thinning was prevented by oscillating the internal pressure, because the protrusion is formed gradually by the prevention of sharp bulging. In the hydroforming, for the pulsating pressure, several steps occur in variations in wall thickness, and thus, the thickness of the tube increases; whereas, for the peak pressure, the thickness is reduced continuously. Moreover, the effects of the amplitude and the number of cycles of pressure per unit punch, the stroke on formability and the corner filling are examined. It is shown that the small number of cycles of pressure and large amplitudes improve the formability; whereas, a large number of cycles of pressure and small amplitudes increase the die corner filling and shape accuracy as well. | ||
| کلیدواژه‌ها | ||
| Tube hydroforming؛ Pulsating hydroforming؛ T-shape tubes؛ FE Simulation؛ Tube formability | ||
| عنوان مقاله [English] | ||
| Mechanism of Improvement of Formability in Pulsating Hydroforming of T-shape Tubes | ||
| چکیده [English] | ||
| In this paper, the mechanism of improvement of formability in pulsating hydroforming of T-shape tubes is investigated by the finite element simulation and experiment. It is shown that local thinning was prevented by oscillating the internal pressure, because the protrusion is formed gradually by the prevention of sharp bulging. In the hydroforming, for the pulsating pressure, several steps occur in variations in wall thickness, and thus, the thickness of the tube increases; whereas, for the peak pressure, the thickness is reduced continuously. Moreover, the effects of the amplitude and the number of cycles of pressure per unit punch, the stroke on formability and the corner filling are examined. It is shown that the small number of cycles of pressure and large amplitudes improve the formability; whereas, a large number of cycles of pressure and small amplitudes increase the die corner filling and shape accuracy as well. | ||
| کلیدواژه‌ها [English] | ||
| Tube hydroforming, Pulsating hydroforming, T-shape tubes, FE Simulation, Tube formability | ||
| مراجع | ||
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[1] S. J. Kang, H. K. Kim, B. S. Kang, "Tube size effect on hydroforming formability", J. Mater. Process. Technol., Vol. 160, pp. 24-33, 2005. [2] M. Strano, S. Jirathearanat, S. G. Shr, T. Altan, "Virtual process development in tube hydroforming", J. Mater. Process. Technol., Vol. 146, pp. 130-136, 2004. [3] http://www.opton.co.jp [4] Mori, K., Patwari, A.U., Maki, S., "Improvment of formability by oscillation of internal pressure in pulsating hydroforming of tubes", Ann. CIRP, Vol. 53, No. 1, pp. 215-218, 2004. [5] K. Mori, T. Maeno, S. Maki, "Mechanism of improvement of formability in pulsating hydroforming of tube", Int. J. of Mach. Tools and Manu. 47, pp. 978-984, 2007. [6] T. Hama, M. Asakawa, H. Fukiharu, A. Makinouchi, M., "Finite Element Simulation of Hammering Hydroforming of an Automotive Component", in Proc. TUBEHYDRO2003, Aichi, Japan, pp. 80-83. [7] M. Loh-Mousavi, K. Mori, K. Hayashi, S. Maki, M. Bakhshi, "3-D finite element simulation of pulsating T-shape hydroforming of tubes", Key Engineering Materials, vol. 340, pp. 353-358, 2007. [8] M. Loh-Mousavi, K. Mori, K. Hayashi and M. Bakhshi, "Improvement of filling of die corners in box-shaped tube hydroforming by control of wrinkling", Key Engineering Materials, vol. 344, pp. 461-467, 2007. [9] M. Suetake, K. Manabe, S. Miyamoto, H. Koyama, T. Yagami, M. Yang, "Development of tube hydroforming with intelligent process control system", in Proc. TUBEHYDRO 2003, Aichi, Japan, pp. 7-14. [10] G.T. Kridli, L. Bao, P. K. Mallick, Y. Tian, "Investigation of thickness variation and corner filling in tube hydroforming", J. Mater. Process. Technol., Vol. 133, pp. 287-296, 2003. [11] K. Mori, T. Maeno, M. Bakhshi-Jooybari, S. Maki, "Measurment of friction force in free pulsating hydroforming", Advanced Technology of Plasticity 2005, Padova, CD-ROM. | ||
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