Study on of Foil Rolling With Lubrication Effects

Document Type : Persian

Authors

1 - M. Sc., Mechanical Engineering Dept. , Isfahan University Of Technology

2 Professor, Mechanical Engineering Dept. , Isfahan University Of Technology

3 Assistant Professor, Mechanical Engineering Dept. , Isfahan University Of Technology

Abstract

In cold rolling of thin strips, i.e., foils (Thickness<50µm), it is important to take into account the flattening of the roll surfaces. The displacement of the roll surface is obtained by combining some results from the well-known Hertzian theory of contact mechanics and roll-modeling as a system of springs with different spring constants within contact conjunction. Use of lubricants can reduce rolling force and improve surface properties of the foil. Depending on the lubricant properties and rolling speed, either hydrodynamic lubrication or mixed lubrication regimes can prevail. The present theoretical work is focused upon the influence of the rolling-process parameters like rolling speed, reduction ratio, roll surface roughness and lubricant viscosity on the friction coefficient and film thickness in the roll bite in the mixed lubrication regime. Results show that with increase of viscosity, rolling force decreases and film thickness increases.
 

Keywords

References

                   [1]- Orowan. E., Porscoe. K.J., "A simple Method of Calculating Roll Pressure and Power Consumption in Hot Flat Rolling", Iron and Steel Institute, London, No.3, 4pp. 124-126, 1946.
                   [2]- Fleck, N. A., Johnson, K. L., "Towards a New Theory of Cold Rolling Thin Foil", Int. J. Mech. Sci., Vol. 29, pp. 7, 1987.
                   [3]- Stahlbery , Uif, Keife, H., "Improved Flatness in Cold Rolling of Copper Foils", J. of Mat. Proc. Techn., Vol. 37, pp. 157-174, 1993.
                   [4]- Keife, H., Jonsater, T., "Influence of Rolling Speed upon Friction in Cold Rolling of Foils", J. of Tribology, Vol. 119, pp. 349-357, 1997.
                   [5]- Luo, Ch., Keife, H., "A Thermal Model for the foil Rolling Process", J. of Mat. Proc. Techn., Vol 74, pp. 158-173, 1998.

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