Experimental and FEM Studies of the Relationships between Equal-Channel Angular Pressing Die Design, Strain Distribution and Pressing Forces

Abstract:

This paper addresses the influence of design on the performance of Equal-channel Angular Pressing dies, of which the important geometric parameters are the internal channel angle (Ф) and the curvature radii at this point. The investigation consists of FEM analysis (computational simulation) of the effect on die performance of the independent variation of the outer and inner curvature radii at the channels ́ intersection, plus the corresponding experimental validation (physical simulation). Using a Pb-62%Sn alloy, twelve R-r combinations were simulated and tested, keeping constant the Ф angle. Results indicated the best R-r combinations in terms of equivalent deformation level and homogeneity, together with the optimization of pressing forces.

• Periodical: Advanced Materials Research (Volume 922)
• Pages: 507-512
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.922.507
• Online since: May 2014
• Authors: Vitor Luiz Sordi*, A.A. de A. Mendes Filho, Gustavo T. Valio, Phillip Springer, José Benaque Rubert, Maurizio Ferrante
• Keywords: Corner Gap, Die Design, ECAP, Pressing Force, Strain Homogeneity

References

[1] R.Z. Valiev, T.G. Langdon, Principles of Equal-Channel Angular Pressing as a Processing Tool for Grain Refinement, Progr. Mat. Sci. Vol. 51(2006), 881-981.

DOI: 10.1016/j.pmatsci.2006.02.003

[2] Y. Iwahashi, J. Wang, Z. Horita, M. Nemoto, T.G. Langdon, Principles of Equal-Channel Angular Pressing for the Processing of Ultra-fine Grained Materials, Scripta Mater.Vol. 35 (1996), 143 – 146.

DOI: 10.1016/1359-6462(96)00107-8

[3] S.W. Chung, H. Somekawa, T. Kinoshita, W.J. Kim, K. Higashi, The non-uniform behavior during ECAE process by 3-D FVM simulation, Scripta Mater.Vol. 50 (2004), 1079-1083.

DOI: 10.1016/j.scriptamat.2003.11.062

[4] S. Xu, G. Zhao, X. Ma, G. Ren, Finite element analysis and optimization of equal channel angular pressing for producing ultra-fine grained materials, J. Mat. Process. Techn. Vol. 184 (2007), 209-216.

DOI: 10.1016/j.jmatprotec.2006.11.025

[5] C. J. Luis Pérez, On the correct selection of the channel die in ECAP processes, Scripta Mater.Vol. 50 (2004), 387-393.

DOI: 10.1016/j.scriptamat.2003.10.007

[6] R.Comaneci, L.Zaharia, R. Chelariu, Damaging prediction of difficult-to-work aluminum alloys during Equal Channel Angular Pressing, J. Mater. Eng. Performance, Vol. 21 (2012), 287-297.

DOI: 10.1007/s11665-011-9904-5

[7] P. Springer, J.B. Rubert, V.L. Sordi, M. Ferrante, Development by computational simulation and performance analysis of an Equal-channel Angular Pressing die, Technol. Metal. Mater. Miner. Vol. 10 (2013), 120-127.

[8] R. Luri, C.J. Luis, J. León, M.A. Sebastian, A new configuration for Equal Channel Angular Extrusion dies, J. Manuf. Sci. Eng. 128, Trans.of the ASME (2006), 860-865.

DOI: 10.1115/1.2194555

[9] B.S. Moon, H.S. Kim, S. Hong, Plastic flow and deformations homogeneity of 6061 Al during equal channel angular pressing, Scripta Mater. Vol. 46 (2002), 131-136

DOI: 10.1016/s1359-6462(01)01209-x

[10] R. Luri, J. León, C.J. Luis, I. Puertas, 21st International Manufacturing Conference, Vol. 1 (2004), 167-174.

[11] P. Leo, E. Cerri, P.P. de Marco, H.J. Roven, Properties and deformation behavior of severe plastic deformed aluminium alloys, J. Mat. Process. Techn. Vol. 182 (2007), 207-214.

DOI: 10.1016/j.jmatprotec.2006.07.038

[12] P. Springer, MSc Dissertation, Federal University of Sao Carlos (2012).