Influence of Process Parameters on Hot Backward Extrusion of Al 6061 alloy

Document Type : Research Paper

Authors

• E Behtari Poor
• M.M Moshksar
• R Ebrahimi

Abstract

Backward extrusion is one of the metal forming processes which has been widely used for the production of hollow parts in recent years. In this study, the effect of process parameters such as reduction of area and temperature and friction conditions on the hot backward extrusion process of aluminum 6061 alloy was investigated for both experiment and finite element analysis. For this purpose, the backward extrusion carried out under three different temperatures (390, 420 and 450 °C) and different friction conditions( with or without lubricant) and then their results were compared to finite element software (DEFORM-3D) result. To perform experiments, a full set of backward extrusion die including chamber, punch, extrusion die, holder and ejector parts were designed and built. Grease-resistant was used as a lubricant. In the finite element analysis, the conventional constant friction factor was used for the simulation of hot forming condition (m=0.1, 0.2, 0.3). In conclusion the analysis and paper results are useful to develop a special hot extrusion technology for aluminum 6061 alloy.

Keywords

• Backward Extrusion
• Al 6061 alloy
• Finite element method
• DEFORM-3D

20.1001.1.22285946.1396.8.30.12.3

---

References

[1]S.H. Hosseini, K. Abrinia, G. Faraji, "Applicability of a modified backward extrusion process on commercially
pure aluminum", Materials and Design, Vol. 65, pp.521–528, 2015.

[2] K. Abrinia, S. Orangi, "Investigation of process parameters for the backward extrusion of arbitrary-shaped tubes from round billets using finite element analysis", J Mater Eng Perform, Vol. 18,1201–8, 2009.

3- A. Farhoumand, R. Ebrahimi, " Analysis of forward–backward-radial extrusion process", Mater Des ,Vol. 30,2152–7, 2009.

4- WB. Bae, DY. Yang,"An upper-bound analysis of the backward extrusion of tubes of complicated internal shapes from round billets", J Mater Process Technol, Vol. 36, 157–73, 1993.

5- Forging Equipment, Materials and Practices, Air Force Materials Laboratory, Metals and Ceramics Information Center, Ohio, p. 13, 1973.

6- Y.V.R.K. Prasad, S. Sasidhara, Hot Working Guide, ASM International, Materials Park, OH, 1997.

7- Joseph R. Davis, Metals Handbook, Properties and Selection: Nonferrous Alloys
and Special-Purpose Materials, ASM International, Materials Park, 1990.

 

8- S.K. Biswas, W.A. Knight, International Journal of Machine Tool Design and Research, Vol. 15, p.179–193,1975.

9- Akgerman, T. Altan, SME Technical Paper, p. 72–110, 1972.

10- L. Li, F. Wang, "Simulation Study on Influence of Forming Process Parameters on Backward Extrusion Height of 6061Aluminum-Alloy Wheel", Applied Mechanics and Materials, 121, 363-366, 2012.