Improvement of Die Corner Filling of Stepped Tubes Using Warm Hybrid Forming

Document Type : Original Article


Advanced Material Forming Research Center, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran


Aluminum and magnesium alloys are of materials for decreasing vehicle weight and consequently reducing fuel consumption. However, forming limitations regarding their low formability at room temperature are found when being manufactured by conventional forming processes. For this reason, development of new forming techniques, such as warm tube hydroforming, is needed to overcome such limitations. In addition, production of parts with sharp corners is nearly impossible using conventional forming processes. This paper investigates the possibility of forming stepped tubes with high expansion ratio, sharp corner radii and precise geometric shape using a developed hybrid hydroforming and bending method. To assess tube formability, the bulge test was adopted with different forming temperatures and axial feeds. It is shown that using the feed of 35 mm and feed rate of 15 mm/min, a stepped tube with 47.6 % expansion ratio and corner filling ratio of about 100 % (part with sharp corners) could be achieved when adopting the developed hybrid hydroforming and bending method at 150 ᵒC.


. Lang, L., Wang, Z., Kang, D., Yuan, S., Zhang, S.-H., Danckert,
J. and Nielsen, K.B.J.J.o.M.P.T., "Hydroforming highlights:
Sheet hydroforming and tube hydroforming", Journal of
Materials Processing Technology, Vol. 151, No. 1-3, (2004),
2. Salahshoor, M., Gorji, A. and Bakhshi-Jooybari, M.J.I.J.o.E.-
T.A.B., "Investigation of the effects of pressure path and tool
parameters in hydrodynamic deep drawing", International
Journal of Engineering, Transactions A: Basics, Vol. 27, No. 7,
(2014), 1155-1166.
3. Reddy, P.V., Reddy, B.V. and Rao, P.S.J.M.T.P., "A numerical
study on tube hydroforming process to opt imize the process
parameters by taguchi method", Materials Today: Proceedings,
Vol. 5, No. 11, (2018), 25376-25381.
4. Khosrojerdi, E., Bakhshi-Jooybari, M., Gorji, A. and
Hosseinipour, S.J., "Experimental and numerical analysis of
hydrodynamic deep drawing assisted by radial pressure at
elevated temperatures", The International Journal of Advanced
Manufacturing Technology, Vol. 88, No. 104, (2016), 185-195.
5. Lee, M.-Y., Sohn, S.-M., Kang, C.-Y., Suh, D.-W. and Lee, S.-
Y., "Effects of pre-t reatment conditions on warm
hydroformability of 7075 aluminum tubes", Journal of Materials
Processing Technology, Vol. 155, (2004), 1337-1343.
6. Yadav, A.D., "Process analysis and design in stamping and sheet
hydroforming", The Ohio State University, (2008),
7. Varloteaux, A., Blandin, J. and Suery, M., "Cont rol of cavitation
during superplast ic forming of high strength aluminium alloys",
Materials Science and Technology, Vol. 5, No. 11, (1989), 1109-
8. Hosford, W.F. and Caddell, R.M., "Metal forming: Mechanics
and metallurgy, Cambridge University Press, (2011).
9. Yuan, S., Qi, J. and He, Z., "An experimental investigation into
the formability of hydroforming 5a02 al-tubes at elevated
temperature", Journal of Materials Processing Technology, Vol.
177, No. 1-3, (2006), 680-683.
10. Kim, B., Van Tyne, C., Lee, M. and Moon, Y., "Finite element
analysis and experimental confirmation of warm hydroforming
process for aluminum alloy", Journal of Materials Processing
Technology, Vol. 187, (2007), 296-299.
11. Yi, H., Pavlina, E., Van Tyne, C. and Moon, Y., "Application of
a combined heat ing system for the warm hydroforming of
lightweight alloy tubes", Journal of Materials Processing
Technology, Vol. 203, No. 1-3, (2008), 532-536.
12. Gang, L., ZHANG, W.-d., HE, Z.-b., YUAN, S.-j. and Zhe, L.,
"Warm hydroforming of magnesium alloy tube with large
expansion rat io within non-uniform temperature field",
Transactions of Nonferrous Metals Society of China, Vol. 22,
(2012), s408-s415.
13. Seyedkashi, S.H., Moslemi Naeini, H., Liaghat , G., Mosavi
Mashadi, M., Shojaee G, K., Mirzaali, M. and Moon, Y.H.,
"Experimental and numerical invest igat ion of an adaptive
simulated annealing technique in opt imization of warm tube
hydroforming", Proceedings of the Institution of Mechanical
Engineers, Part B: Journal of Engineering Manufacture, Vol.
226, No. 11, (2012), 1869-1879.
Distance from tube center (mm)
Thickness (mm)
Distance from tube center (mm)
Thickness (mm)
A. Taheri Ahangar et al. / IJE TRANSACTIONS A: Basics Vol. 32, No. 4, (April 2019) 587-595 595
14. Hashemi, S., Naeini, H.M., Liaghat, G. and Tafti, R.A., "Prediction of bulge height in warm hydroforming of aluminum tubes using ductile fracture criteria", Archives of Civil and Mechanical Engineering, Vol. 15, No. 1, (2015), 19-29.
15. Mitsui, S., Miyagawa, T., Yasui, H. and Yoshihara, S., "Warm bulge forming of small diameter a1100 aluminium tube", in Materials Science Forum, Trans Tech Publications, Vol. 920, (2018), 149-154.
16. Elyasi, M., Bakhshi-Jooybari, M. and Gorji, A., "A new die design for the hydroforming of stepped tubes", International Journal of Material Forming, Vol. 3, No. 1, (2010), 71-75.
17. Ramberg, W. and Osgood, W.R., "Description of stress-strain curves by three parameters", NASA, Scientific and Technical Information Facility (1943).
18. Afshar, A., Hashemi, R., Madoliat, R., Rahmatabadi, D., Hadiyan, B.J.M. and Industry, "Numerical and experimental study of bursting prediction in tube hydroforming of al 7020-t6", Mechanics and Industry, Vol. 18, No. 4, (2017), 411.
19. Yang, L., Tao, Z. and He, Y., "Prediction of loading path for tube hydroforming with radial crushing by combining genetic algorithm and bisection method", Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, Vol. 229, No. 1, (2015), 110-121.
20. Yuan, S., Wang, X., Liu, G. and Wang, Z., "Control and use of wrinkles in tube hydroforming", Journal of Materials Processing Technology, Vol. 182, No. 1-3, (2007), 6-11.