Controlling the Thickness Uniformity in Equal Channel Angular Rolling (ECAR)


Article Preview

As the surface friction between feeding rolls and metal sheet generates the feeding power of ECAR, the generated feeding power is low, and the friction between the metal sheet and ECAR die should be minimized. However, for obtaining a large shear deformation by ECAR, the metal sheet should be tightly contacted with the wall of ECAR die. In this condition, the thickness of the metal sheet is continuously increased during ECAR. A new ECAR apparatus is developed for maximizing the shear deformation and obtaining sheet thickness uniformity, and succeeding continuous ECAR with such a limited feeding power. By controlling the outlet gap of the ECAR die with elastic unit, the thickness of the metal sheet is kept uniform. Detailed thickness control mechanism during the new ECAR process is analyzed. A sheet of Al 6063 alloy that is 1-pass deformed with the new ECAR apparatus shows below ±0.037 mm of thickness variation and 0.61 of shear strain.



Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran




Y. H. Chung et al., "Controlling the Thickness Uniformity in Equal Channel Angular Rolling (ECAR)", Materials Science Forum, Vols. 539-543, pp. 2872-2877, 2007

Online since:

March 2007




[1] R. Z. Valiev, N.A. Krasilnikov and N.K. Tsenev: Mater. Sci. Eng. Vol. A137 (1991), p.35.

[2] V. M. Segal: Mater. Sci. Eng. Vol. A197 (1995), p.157.

[3] N. Tsuji, Y. Saito, H. Utsunomiya and S. Tanigawa: Scripta Mater. Vol. 40 (1999), p.795.

[4] Y. T. Zhu, T. C. Lowe et al: US Patent No. 6, 197, 129 B1 (2001).

[5] K. H. Kim and D. N. Lee: Acta Mater. Vol. 49 (2001), p.2583.

[6] T. Sakai, S. Hanada and Y. Saito: Scripta Mater. Vol. 44 (2001), p.2569.

[7] M. Richert, H. P. Stuwe, J. Richert, R. Pippan and C. Motz: Mater. Sci. Eng. Vol. A301 (2001), p.237.

[8] Z. P. Xing, S. B. Kang and H. Kim: Metall. and Mater. Trans. A Vol. 33A (2002), p.1521.

[9] J. C. Lee, H. K. Seok, J. Y. Suh and Y. H. Chung: Metall. and Mater. Trans. A Vol. 33A (2002), p.665.

[10] Y. H. Chung, H. D. Kim, H. T. Jeong, O. Engler and M.Y. Huh: Mater. Sci. Forum Vol. 396~402 (2002), p.475.

[11] Y. Iwahashi, J. Wang, M. Nemoto and T. G. Langdon: Scripta Mater. Vol. 35 (1996), p.143.

[12] J. C. Lee, H. K. Soek, J. Y. Suh, Y. H. Chung and H. I. Lee: J. of Kor. Inst. Met. and Mat. Vol. 39 (2001), p.293.