An Analytical Model and Numerical Simulations to Predict Process Parameters in the Tube Bending Under Internal Fluid Pressure

Document Type : Research Article

Authors

1 Faculty of Mechanical Engineering, Noshirvani University of Technology, Babol, Iran

2 Department of Mechanical Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran

Abstract

Nowadays, thin-walled tube bending at small bending ratios (equal to R/D, R: bending radios, D: tubes outer diameter) is a production process widely used in advanced industries. Despite extensive studies into the field of rotary draw bending area, few of them have implemented this process with internal fluid, and they have not reported the exact location of bend defects and the effects of bending ratio on the defects of Hydro-rotary draw bending either. This research has been carried out to obtain the smallest bending ratio, and maximum applicable internal pressure in Hydro-rotary draw bending of thin-walled AA6063 alloy tube using analytical model. In addition, some effective parameters in Hydro-rotary draw bending are simulated with ABAQUS-software. Maximum thinning and critical ovality regions were investigated in addition to the effects of bending ratio and internal fluid pressure on the distribution of thickness and ovality, using simulation, analytical and experimental tests. The results showed that the selected necking criterion would be able to successfully determine the onset of rupture in bending. In order to validate FE-simulation, the effects of bending ratio and internal pressure on defects, such as cross-section ovality and thickness changing have also been investigated through simulation in ABAQUS-software and experiments. 

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Main Subjects

References

[1] H. Yang, H. Li, Z. Zhang, M. Zhan, J. Liu, G. Li, Advances and trends on tube bending forming technologies, Chinese Journal of Aeronautics, 25(1) (2012) 1-12.
[2] G.G. Miller, Tube forming processes: a comprehensive guide, Society of Manufacturing Engineers, 2003.
[3] https://www.tubeformsolutions.com/blog/bending-tooling-components-explained.
[4] A. Kale, H. Thorat, Effect of precompression on ovality of pipe after bending, Journal of Pressure Vessel Technology, 131(1) (2009) 011207.
[5] A. Veerappan, S. Shanmugam, Analysis for flexibility in the ovality and thinning limits of pipe bends, Ratio, 4796(85.20) (2006) 85.20.
[6] K. Pan, K. Stelson, On the plastic deformation of a tube during bending, Journal of Engineering for industry, 117(4) (1995) 494-500.
[7] N. Tang, Plastic-deformation analysis in tube bending, International Journal of Pressure Vessels and Piping, 77(12) (2000) 751-759.
[8] X. Wang, J. Cao, Wrinkling limit in tube bending, Journal of engineering materials and technology, 123(4) (2001) 430-435.
[9] M. Zhan, H. Yang, Z.-Q. Jiang, Z. Zhao, Y. Lin, A study on a 3D FE simulation method of the NC bending process of thin-walled tube, Journal of Materials Processing Technology, 129(1-3) (2002) 273-276.
[10] J.-b. Yang, B.-h. Jeon, S.-I. Oh, The tube bending technology of a hydroforming process for an automotive part, Journal of Materials Processing Technology, 111(1-3) (2001) 175-181.
[11] J. Wang, R. Agarwal, Tube bending under axial force and internal pressure, Journal of Manufacturing Science and Engineering, 128(2) (2006) 598-605.
[12] L. Lazarescu, Effect of internal fluid pressure on quality of aluminum alloy tube in rotary draw bending, International journal of advanced manufacturing technology, 64(1) (2013) 85-91.
[13] J. Soleimani, M. Elyasi, M. Hoseinzadeh, Embedding of internal fluid pressure investigation in mandrel through tube rotary draw bending of thin-walled tubes with critical bend radius, Modares Mechanical Engineering, 16(9) (2016) 287-297.
[14] J. Hu, Z. Marciniak, J. Duncan, Mechanics of sheet metal forming, Elsevier, 2002.
[15] R. Agarwal, Tube bending with axial pull and internal pressure, Texas A&M University, 2004.
[16] B. Engel, H.R. Hassan, Investigation of neutral axis shifting in rotary draw bending processes for tubes, steel research international, 85(7) (2014) 1209-1214.
[17] G. Khodayari, How the Material Influences the Bending for Hydroforming: Effects on Ovality, Springback, and Wall Thickness in Tubes, Tube Pipe J., January, 10 (2002).
Amirkabir Journal of Mechanical Engineering
Volume 50, Issue 3
September and October 2018
Pages 447-466

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