Metallurgical Engineering

Metallurgical Engineering

The influence of extrusion die angle on the deformation force and hardness of AA6061 aged aluminum section

Document Type : Research Paper

Authors
Bahman Mirzakhani 1
Mostafa Mansoorinejad 2
Yousef Payandeh 3
1 Associate Professor, Department of Materials Science and Metallurgy, Faculty of Engineering, Arak University, Arak, Iran.
2 Assistant Professor, Department of Materials Science and Metallurgy, Faculty of Engineering, Islamic Azad University, Dezfoul, Iran
3 Assistant Professor, Department of Materials Science and Metallurgy, Faculty of Engineering, Arak University, Arak, Iran.
10.22076/me.2021.82763.1178
Abstract
Die angle has a great influence on the product quality and extrusion force. In this research, the influence of die angle on extrusion force and hardness distribution in AA 6061 alloy was investigated. The 6061 aluminum billets were initially reheated and then extruded by different die angle molds and finally artificially aged. The half die angles of 30°, 45° and 60° in a single facet molds and 60° and 30° in a two facet mold were employed in extrusion experiments. The results show that the sample surfaces of extruded rods with all die angles mold have the most value of hardness. Meanwhile, by increasing the half dies angle, the hardness gradient form sample surface to its inside increases. In two facet mold, the change in die angle from 60° to 30° results in deformation homogeneity and increasing in extrusion force. However, the mold with 45° die angle requires the minimum force for pressing.
Keywords
6061 Aluminum alloy
extrusion
half die angle
precipitation hardening
  1. Solomon, and L. Solomon, Effect of die shape on the metal flow pattern during direct extrusion process, Rev. Metal., 2010, Vol. 46, No. 5, pp. 396-404.
  2. V.Reddy, P.M. Dixit, and Lal, G.K. Die design for axisymmetric extrusion, J. Mat. Process. Tech., 1995, Vol. 55, pp. 331-339.
  3. O. Adeosun, O.I. Sekunow, Gbenebor, O.P., Effect of die entry angle on extrusion responses of aluminum 6063 alloy, Int. J. Eng. Tech., 2014, Vol. 4, pp. 127-134.
  4. Mansourinejad and B. Mirzakhani, Influence of sequence of cold working and aging treatment on mechanical behaviour of 6061 aluminum alloy, Trans. Nonferrous Met. Soc. China,2012,Vol. 22, pp. 2072−2079.
  5. Mirzakhani and M. Mansourinejad, Tensile properties of AA6061 in different designated precipitation hardening and cold working, Proc.Eng.,2011, Vol. 10, pp.136–140.
  6. A. Chaudhari,S.R. Andhale, N.G. Patil, Experimental evaluation of effect of die angle on hardness and surface finish of cold forward extrusion of aluminum, Int. J. Emerg. Tech. Adv. Eng., 2012, Vol. 2, pp. 334-338.
  7. Donovan, R. Fortune and R. Trout, Elevated temperature effects on the mechanical properties of age hardened 6xxx series aluminum alloy extrusions, M.S. Thesis, California State University, USA, 2015.
  8. Berndt, P. Frint, M.F. Wagner, Influence of extrusion temperature on the aging behavior and mechanical properties of an AA6060 aluminum alloy, Metals, 2018, Vol. 8, No. 1, pp. 51.
  9. Avitzur, Metal Forming: Processes and Analysis, 1968. Mc Graw-Hill, USA.
  10. Avitzur, Limit Analysis of Flow through Conical Converging Dies, 1975, J. Frank. Inst., Vol. 299, No.5, 338-358.
  11. Ghaemi, R. Ebrahimi and R. Hosseinpour, Optimization of die profile for cold forward extrusion using an improved slab method analysis, Iran J. Sci. Tech., Trans. Mech. Eng., 2013, Vol. 37, pp. 189-202.

  • Receive Date 07 March 2018
  • Revise Date 20 August 2021
  • Accept Date 14 September 2021