Experimental and Numerical Investigation of Die Filling and Thickness Distribution for Producing Bended Tubes with Non-Uniform Bending Radius and Diameter in Hydroforming Die with Moveable Bushes

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Abstract

Achieving sharp corners in hydroforming process is difficult or impossible in experimental producer. Also, augmenting pressure for producing sharp corner and filling the die is caused local thinning and fracture in the corners of tubes. Then, the corner of tubes has the less thickness compared with the other parts. In new dies which leads sharpen corners, tube forming contains two phases, bulge and forming. In current paper, a new die for producing bended SS-316L tubes with non-uniform bending radius and diatreme has been offered by considering experimental tests and finite element modelling. Having two movable bushes for producing completely filled steps is one of the merits of new die. Movement of movable bushes can omit the friction between die and bushes while the specimen is feeding. Another advantage of this die is having less forming pressure and non-complicated die structure. In addition, thickness distribution of tubes which was produced in this die is more uniform than the previous dies.

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References

[1] Loh-Mousavi M, Mori K, Bakhshi-Jooybari M, Farzin M, Hoseinipour SJ (2007) Finite element simulation of box shape hydroforming with pulse pressure. Science-Research Journal of Majlesi 2: 47-54. (In Persian)
[2] Loh-Mousavi M, Mori K, Hayashi K, Bakhshi-Jooybari M (2007) Improvement of filling of die corners in box-shaped tube hydroforming by control of wrinkling. Key Eng Mat 344: 461-467.
[3]  Chen FK, Wang SJ, Lin RH (2007) A study of forming pressure in the tube-hydroforming process. J Mater Process Tech 192-193: 404-409.
[4]  Koc M (2003) Investigation of the effect of loading path and variation in material properties on robustness of the tube hydroforming process. J Mater Process Tech 133: 276-281.
[5] Menghari HG, Ziaei Poor H, Farzin M, de Sousa RA (2014) An approach to improve thickness distribution and corner filling of copper tubes during hydro-forming processes. Struct Eng Mech 50(4): 563-573.
[6]  Mori K, Maeno T, Bakhshi-Jooybari M, Maki S (2005) Measurement of friction force in free bulging pulsating hydroforming of tubes. In: P.F.Bariani et al.(Ed) Advanced Technology of Plasticity, Edizioni Progetto Padova, Padova, CD-ROM.
[7]  Yuan S, Wang X, Liu G, Wang ZR (2007) Control and use of wrinkles in tube hydroforming. J Mater Process Tech 182: 6-11.
[8] Menghari HG, Farzin M, Sadat A, Gorji A (2016) Experimental and numerical investigation of die filling and thickness variation at two step box copper tube hydroforming die with movable bushes. Journal of Solid and Fluid Mechanics 6(2): 87-96. (In Persian)
[9]  Nikhare C, Weiss M, Hodgson PD (2009) FEA comparison of high and low pressure tube hydroforming of TRIP steel. Comp Mater Sci 47: 146-152.
[10]  Elyasi M, Bakhshi-Jooybari M, Gorji A (2010) A new hydro forming die design for improvement of die corner filling of stepped tubes. Modares Mech Eng 10(3): 87-98. (In Persian)
Journal of Solid and Fluid Mechanics
Volume 7, Issue 1
March and April 2017
Pages 11-21

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