FEM Analysis of the Skin Contamination Behavior in the Extrusion of a AA6082 Profile

Abstract:

In the extrusion of aluminum alloys, the skin contamination lead to the scraping of the profile extent in which this defect occurs. In order to optimize the scraping process, extrusion companies and die makers can either perform time-consuming and expensive analyses to experimentally determine the evolution of the defect or rely on predictive methods. Recently, numerical methods, as the Finite Elements, are increasingly used to predict the evolution of the skin contamination, but their accuracy is still uncertain. In this work, an AA6082 aluminum profile of industrial complexity is analysed and the data collected used to validate an innovative method for the prediction of the skin contamination evolution developed using the commercial FEM code Qform®. In addition, the results are used to assess the prediction accuracy of an industrial empirical formula often used by operators.

• Periodical: Key Engineering Materials (Volume 926)
• Pages: 452-459
• DOI: https://doi.org/10.4028/p-y37nm3
• Online since: July 2022
• Authors: Marco Negozio*, Riccardo Pelaccia, Lorenzo Donati, Barbara Reggiani
• Keywords: Back-End Defect, Extrusion, FEM, Qform, Skin Contamination

References

[1] Y.T. Kim, K. Ikeda, Flow behavior of the billet surface layer in porthole die extrusion of aluminum, Metall Mater Trans A 31. (2000) 1635–1643.

DOI: 10.1007/s11661-000-0173-4

[2] N. Hashimoto, Application of Aluminum Extrusions to Automotive Parts. 150. (2015).

[3] N. Parson, J. Fourmann, J.F. Beland, Aluminum Extrusions for Automotive Crash Applications, SAE Technical Papers. (2017) 1–16.

DOI: 10.4271/2017-01-1272

[4] J. Hirsch, Automotive trends in aluminium - The European perspective, Materials Forum. 28(3) (2004) 15–23.

[5] H. Valberg, M. Lefstad, A. Costa, On the Mechanism of Formation of Back-End Defects in the Extrusion Process, Procedia Manufacturing 47 (2020) 245-252.

DOI: 10.1016/j.promfg.2020.04.207

[6] B. Reggiani, T. Pinter, L. Donati, Scrap assessment in direct extrusion. Int J Adv Manuf Technol 107 (2020) 2635–2647.

DOI: 10.1007/s00170-020-05127-x

[7] M. Negozio, R. Pelaccia, L. Donati, B. Reggiani, T. Pinter, L. Tomesani, Finite Element Model Prediction of Charge Weld Behaviour in AA6082 and AA6063 Extruded Profiles. J. of Materi Eng and Perform 30 (2021) 4691–4699.

DOI: 10.1007/s11665-021-05752-x

[8] W.D. Finkelnburg, G. Scharf, Some investigations on the metal flow during extrusion of Al alloys, Proceedings of the 5th ET Seminar II (1992) 475–484.

[9] C. Jowett, J. Adams, C. Daughetee, G. Lea, O.A. Huff, N. Fossl, Scrap allocation, In the Proceedings of the 9th Extrusion Technology Seminar (2008) Florida, USA.

[10] T. Ishikawa, H. Sano, Y. Yoshida, N. Yukawa, J. Sakamoto, Y. Torzawa, Effect of Extrusion Conditions on Metal Flow and Microstructures of Aluminum Alloys, CIRP Annals 55 (1) (2006) 275-278.

DOI: 10.1016/s0007-8506(07)60415-6

[11] T. Hatzenbichler, B. Buchmayr, Finite element method simulation of internal defects in billet-to-billet extrusion, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 224 (2010) 1029-1042.

DOI: 10.1243/09544054jem1830

[12] S. Lou, Y. Wang, C. Liu, S. Lu, C. Su, Analysis and Prediction of the Billet Butt and Transverse Weld in the Continuous Extrusion Process of a Hollow Aluminum Profile, J. of Mater. Eng. and Perform. 26 (2017) 4121- 4130.

DOI: 10.1007/s11665-017-2771-y

[13] M. Negozio, R. Pelaccia, L. Donati, B. Reggiani, L. Tomesani, T. Pinter, FEM Validation of front end and back end defects evolution in AA6063 and AA6082 aluminum alloys profiles, Procedia Manufacturing 47 (2020) 202-208, (Cottbus, DE), Elsevier Ltd.

DOI: 10.1016/j.promfg.2020.04.178

[14] A. Hensel, T. Spittel, Kraft und Arbeitsbedarf bildsamer Formgeburgsverfahren, 1. Auflage, Leipzig: VEB Deutscher Verlag fur Grundstoffindustrie, (1978).

[15] M. Schikorra, L. Donati, L. Tomesani, M. Kleiner, The role of friction in the extrusion of AA6060 aluminum alloy, process analysis and monitoring, Journal of Materials Processing Technology 191(1-3) (2007) 288-292.

DOI: 10.1016/j.jmatprotec.2007.03.096

[16] A.N. Levanov, Improvement of Metal Forming Processes by means of Useful Effects of Plastic Friction, Journal of Materials Processing Technology 72 (1997) 314-316.

DOI: 10.1016/s0924-0136(97)00191-x

[17] J. Hallström, Influence of friction on die filling in counterblow hammer forging, J. Mater. Process. Technol. 108 (2000) 21-25.

DOI: 10.1016/s0924-0136(00)00589-6