The Forming Characteristics of AA 2024 Aluminium Alloy in Radial Extrusion Process Combined with Backward Extrusion


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Numerical analysis of radial extrusion process combined with backward extrusion has been performed to investigate the forming characteristics of an aluminum alloy in a combined extrusion process. Various variables such as gap size, die corner radius and frictional conditions are adopted as design or process parameters for analysis in this paper. The main investigation is focused on the analysis of forming characteristics of AA 2024 aluminum alloy in terms of material flow into backward can and radial flange sections. Due to various die geometries and process conditions such as frictional conditions, the material flow into a can and flange shows different patterns during the combined extrusion process and its characteristics are well summarized quantitatively in this paper in terms of forming load, volume ratio etc. Extensive simulation work leads to quantitative relationships between process conditions and the forming characteristics such as volume ratio of flange to can and the size of can and flange in terms of the can height extruded backward. It is easily seen from the simulation results that the volume ratio, which is defined as the ratio of flange volume to can volume, increases as the gap size and/or die corner radius increase. However, it is interesting to note that the frictional condition has little influence on the forming load and the deformation patterns. Usually, the frictional condition is a greatest process variable in normal forging operation. It might be believed from the simulation results that the frictional conditions are not a major process parameter in case of combined extrusion processes. It is also found that the can size, which is defined as the height of billet after forming, turns out to be even smaller than that of initial billet under a certain condition of die geometry.



Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd




D. H. Jang et al., "The Forming Characteristics of AA 2024 Aluminium Alloy in Radial Extrusion Process Combined with Backward Extrusion", Materials Science Forum, Vols. 519-521, pp. 955-960, 2006

Online since:

July 2006




[1] M. Arentoft, H. Bjerregaard, C.B. Andersen, T. Wanheim: J. Mater. Processing Technology Vol. 75 (1998), p.122.

[2] Y.H. Kim, J.H. Park, H.S. Byun: Proc. of International Symposium on Advanced Forming and Die Manufacturing Technology (Pusan, Korea, 1999), p.425.

[3] W. Osen: Proc. of Adv. Tech. of Plasticity Conference (Stuttgart, W. Germany, 1987), p.575.

[4] N. Bay, S. Lassen, K. B. Pedersen: Annals of the CIRP Vol. 40 (1991), p.239.

[5] Q. Sun: Automatic Process Planning and Evaluation for Cold Extrusion of Components, Michigan : U.M.I. Dissertation Services (Michigan, U.S.A., 1995) p.21.

[6] H. -H. Lin, k. Kawakami, H. Kudo(1): Metal Flow Control in Cold Simultaneous Forward/ Backward Extrusion, Annals of the CIRP Vol. 37 No. 1 (1998), p.231.


[7] K. Kuzman: Proceedings of the Sixth ICTP (Nuremberg, Germany, 1999), p.805.

[8] K. Lange, M. Herrmann, P. Keck and M. Wilhelm: J. Mater. Processing Technology Vol. 27 (1991), p.39.

[9] C.H. Lee, S. Kobayashi: J. Eng. Ind. Trans. ASME Vol. 95 (1973), p.865.

[10] Air Force Material Laboratory: Forming Equipment, materials and practices (Metal and Ceramics Information Center, 1973), p.164.

[11] S. Kobayashi, S. I. Oh and T. Altan: Metal Forming and the Finite Element Method, Oxford Univ. Press (1989), p.30.

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