Analysis of asymmetric cold rolling using finite-element method for creating at sheet

Document Type : Article

Authors

1 Sharif University of Technology/ Department of Mechanical Engineering; Tehran, P.O. Box 11155-9567, Iran

2 Center of Excellence in Design, Robotics and Automation, Sharif University of Technology; Academician, Academy of Sciences of IR Iran; Tehran, P.O. Box 11155-9567, Iran,

Abstract

In this paper, a simulation of asymmetric cold rolling is being presented by using an explicit analysis procedure. A two-dimensional finite element model with adaptive meshing technique has been employed to simulate asymmetrical condition, due to difference of the roll radius and velocity. Some conditions have been found to make sheet without curvature, in order to achieve this goal, different velocities have been made in rolls in each radius ratio. To validate the simulation, the results of the simulation has been compared with experimental papers which was done in the past. The effects of asymmetric process have been discussed, which is caused by radius ratio and velocity ratio on the rolling force, rolling torque and on the sheet curvature. Also the optimum velocity ratio in each radius ratio that causes the sheet without curvature was obtained. It was found that the appropriate speed ratio to produce flat sheets (i.e. sheets without curvature) is almost 1.067 being independent of the radius ratios between 1 and 1.05.

Keywords

Main Subjects


References
1. Shivpuri, R., Chou, P.C., and Lau, C.W. \Finite
element investigation of curling in nonsymmetrical
rolling of sheet", Int. J. Mech. Sci., 30, p. 625 (1988).
2. Johnson, W. and Needham, G. \An experimental
study of asymmetrical rolling", in: Applied Mechanics
Convention, Institute of Mechanical Engineers, Cambridge,
UK (1966).
3. Johnson, W. and Needham, G. \Further experiments
in asymmetrical rolling", Int. J. Mech. Sci., 8, p. 443
(1972).
4. Buxton, S.A. and Browning, S.C. \Turn up and turn
down in hot rolling: a study on a model mill using
plasticize", J. Mech. Eng. Sci., 14, p. 245 (1972).
5. Dewhurst, P., Collins, I.F., and Johnson, W. \A
theoretical and experimental investigation into asymmetrical
hot rolling", Int. J. Mech. Sci., 16, p. 389
(1974).
6. Richelsen, A.B. \Elastic-plastic analysis of the stress
and strain distributions in asymmetric rolling", Int. J.
Mech. Sci., 39, p. 1199 (1997).
7. Hwang, Y.M. and Chen, T.H. \Analysis of asymmetrical
rolling by stream function method", JSME, 39, p.
598 (1996).
8. Hwang, Y.M. and Tzou, G.Y. \An analytical approach
to asymmetrical hot sheet rolling considering the e ect
of the shear stress and internal moment at the roll
gap", J Mater Process Technol, 52, pp. 399-424 (1994).
9. Hwang, Y.M. and Tzou, G.Y. \Analysis of asymmetrical
hot strip rolling by the slab method", J Mater Eng
Perform, 4(3), pp. 265-274 (1995).
10. Hwang, Y.M. and Tzou, G.Y. \Analytical and experimental
study on asymmetrical sheet rolling", Int J
Mech Sci, 39(3), pp. 289-303 (1997).
11. Lu, L.-S., Harrer, O.-K., Schwenzfeier, W., and Fischer,
F.D. \Analysis of the bending of the rolling
material in asymmetrical sheet rolling", Int. J. Mech.
Eng. Sci., 42, p. 49 (2000).
12. Salimi, M. and Sassani, F. \Modi ed slab analysis of
asymmetrical plate rolling", Int. J. Mech. Sci., 44, pp.
1999-2023 (2002).
13. Salimi, M. and Kadkhodaei, M. \Slab analysis of
asymmetrical sheet rolling", J Mater Process Technol,
150, pp. 215-222 (2004).
14. Kadkhodaei, M., Salimi, M., and Poursina, M. \Analysis
of asymmetrical sheet rolling by a genetic algorithm",
Int J Mech Sci, 4, pp. 622-634 (2007).
15. Gudur, P.P., Salunkhe, M.A., and Dixit, U.S. \A
theoretical study on the application of asymmetric
rolling for the estimation of friction", Int J Mech Sci,
50, pp. 315-327 (2008).
16. Qwanmizadeh, M., Kadkhodaei, M., and Salimi, M.
\Asymmetrical sheet rolling analysis and evaluation of
developed curvature", Int J Adv Manuf Technol, 57,
pp. 5-14 (2011).
17. Zhang, S.H., Zhao, D.W., Gao, C.R., and Wang,
G.D. \Analysis of asymmetrical sheet rolling by slab
method", Int. J. of Mech. Sci., 55, pp. 168-176 (2012).
18. Chen, S., Liu, H., Peng, Y., and Sun, J. \Slab
analysis of cylindrical shell rolling", J. of Iron and Steel
Research, Int., 21(1), pp. 01-08 (2014).
19. Aboutorabi, A., Assempour, A., and Afrasiab, H.
\Analytical approach for calculating the sheet output
curvature in asymmetrical rolling: In the case of roll
axis displacement as a new asymmetry factor", Int. J.
of Mech. Sci., 105, pp. 11-22 (2016).
20. Sun, J., Peng, Y., Dong, Z., and Du, X. \Study
on asymmetrical deformation and curvature of heavy
cylinder rolling", Int. J. of Mech. Sci., 133, pp. 720-
727 (2017).
21. Pospiech, J. \A note on the in
uence of some factors
a ecting curvature on the
at rolling of strip", J. Mech.
Work. Tech., 15, p. 64 (1987).
22. Liang, H., Hong-shuang, D., and Dian-yao, G. \Analysis
of sheet curvature in asymmetrical cold rolling",
J. Iron and Steel, 20(5), pp. 34-37 (2013).