THE INFLUENCE OF EXTRUSION DIE ANGLE DURING THE HOT EXTRUSION PROCESS OF AL ALLOYS
One of the most important parameters for the hot extrusion process effecting the deformation force, material flow, microstructural and mechanical properties of the extruded material is the Extrusion Die Angle (EDA). In this investigation, the effects of EDA on load, material flow and microstructure of hot extruded commercially pure aluminum has been studied. The Finite element simulation were carried out using Deform 3D. Finite element modeling shows that the values of the equivalent plastic strain and its distribution, flow material and deformation forces depend extremely on deformation temperature, reduction and EDA. To estimate the reliability of the numerical analysis, the FE model was validated using experimental results. The results showed that the lowest extrusion force occurs in an optimum die angle for each reduction. Optimum EDA obtained 16, 18 and 23 degrees at reductions of 50%, 60% and 70%, respectively. Also, material flow, inhomogeneity of microstructure and the equivalent plastic strain increases with increasing of EDA.
J. G. Kaufman, Introduction to Aluminum Alloys and Tempers, ASM International, Materials Park, OH 44073-0002; 2000.
SB. Brown, K.H. Kim, L. Anand, An internal variable constitutive model for hot working of metals, Int. J. Plasticity, 5 (1989) 95–130.
HR. Shercliff, A. M. Lovatt ER, "Modelling of microstructure evolution in hot deformation." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 357, pp. 1621–1643, 1999.
TFuru, H.R. Shercliff, C. Sellars, M. Ashby, "Physically-based modelling of strength, microstructure and recrystallisation during thermomechanical processing of Al–Mg alloys." Material Science Forum 217–222, pp. 453–458, 1996.
CM. Sellars, Q. Zhu, "Microstructural modelling of aluminium alloys during thermomechanical processing." Materials Science and Engineering A 280 (1), pp. 1–7, 2000.
T Sheppard, "Prediction of structure during shaped extrusion and subsequent static recrystallisation during the solution soaking operation. Journal of Materials Processing Technology 177 (1–3), pp. 26–35, 2006.
T. Chanda, J. Zhou, J. Duszczyk, "A comparative study on iso-speed extrusion and isothermal extrusion of 6061 Al alloy using 3D FEM simulation" Journal of Materials Processing Technology 114 (2), pp. 145–153, 2001.
M.S. Joun, S.M. Hwang, “Optimal process design in steady state metal forming by finite-element method. I. theoretical consideration”, Int. J. Mach. Tools Manuf. 33 (1993) 51–61.
S.K. Lee, D.C. Koo, B.M. Kim, “Optimal die profile design for uniform microstructure in hot extrusion”, Int. J. Mach. Tools Manufact. 40 (2000) 1457–1478.
S.M. Byon, S.M. Hwang, “FEM-based optimal design in steady-state metal forming”, J. Comp. Struct. 79 (2001) 1363–1375.
W.F. Hosford, R.M. Caddel, “Metal Forming, Mechanics and Metallurgy”, Prentice-Hall, 1983.
T. Sheppard, “Extrusion of Aluminium Alloys”, Kluwer Academic Publishers, Dordrecht, 1999, p. 127.
E. S. Puchi-Cabrera, C. J. Villalobos-Gutiérrez, A. Carrillo, F. DiSimone “Non-isothermal annealing of a cold rolled commercial twin roll cast 3003 aluminum alloy”, JMEPEG 12 (2003) 261-271.
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