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TECHNICAL PAPERS

Evolution of Surface Pits on Stainless Steel Strip in Cold Rolling and Strip Drawing

[+] Author and Article Information
H. R. Le, M. P. F. Sutcliffe

Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK

J. Tribol 125(2), 384-390 (Mar 19, 2003) (7 pages) doi:10.1115/1.1504088 History: Received February 12, 2002; Revised July 02, 2002; Online March 19, 2003
Copyright © 2003 by ASME
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References

Kudo,  H., 1965, “A Note on the Role of Microscopically Trapped Lubricant at the Tool-Work Interface,” Int. J. Mech. Sci., 7, pp. 383–388.
Mizuno,  T., and Okamoto,  M., 1982, “Effects of Lubricant Viscosity at Pressure and Sliding Velocity on Lubricating Conditions in the Compression-Friction Test on Sheet Metals,” ASME J. Lubr. Technol., 104, pp. 53–59.
Kudo, H., and Azushima, A., 1987, “Interaction of Surface Microstructure and Lubricant in metal Forming Tribology,” Proc. 2nd. Int. Conf. On Adv. Technol. of Plasticity, Stuttgart, pp. 373.
Fudanoki, F., 1997, “Development and Evaluation of Model for Mechanism of Formation of Surface Properties of Cold-Rolled Stainless Steel,” First International Conference on Tribology in Manufacturing Processes, Gifu, Japan, pp. 378–383.
Ahmed, R., and Sutcliffe, M. P. F., 1999, “Evolution of Surface Finish Within the Roll Bite During Cold Rolling of Stainless Steel,” Proceedings of the Conference on Modeling of Metal Rolling Processes 3, Dec. 1999, London, Institute of Materials, pp. 390–399.
Ahmed,  R., and Sutcliffe,  M. P. F., 2000, “Identification of Surface Features on Cold Rolled Stainless Steel,” Wear, 244, pp. 60–70.
Wang, Z., Dohda, K., Yokoi, N., and Haruyama, Y., 1997, “Outflow Behavior of Lubricant in Micro Pits in Metal Forming,” First International Conference on Tribology in Manufacturing Processes, Gifu, Japan, pp. 77–82.
Bech,  J., Bay,  N., and Eriksen,  M., 1999, “Entrapment and Escape of Liquid Lubricant in Metal Forming,” Wear, 232, pp. 134–139.
Ahmed,  R., and Sutcliffe,  M. P. F., 2001, “An Experimental Investigation of Surface Pit Evolution During Cold-Rolling or Drawing of Stainless Steel Strip,” ASME J. Tribol., 123, pp. 1–7.
Sutcliffe,  M. P. F., Le,  H. R., and Ahmed,  R., 2001, “Modeling of Micro-Pit Evolution in Rolling or Strip Drawing,” ASME J. Tribol., 123, pp. 791–798.
Lo,  S. W., and Wilson,  W. R. D., 1999, “A Theoretical Model of Micro-Pool Lubrication in Metal Forming,” ASME J. Tribol., 121, pp. 731–738.
Wilson, W. R. D., and Walowit, J. A., 1972, “An Isothermal Hydrodynamic Lubrication Theory for Strip Rolling with Front and Back Tension,” presented at the Tribology Convention, IMechE, London, pp. 164–172.
Patir,  N., and Cheng,  H. S., 1978, “An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication,” ASME J. Lubr. Technol., 100, pp. 12–17.
Lo,  S. W., 1994, “A Study on the Flow Phenomena in the Mixed Lubrication Regime by Porous Medium Model,” ASME J. Tribol., 116, pp. 640–647.
Wilson,  W. R. D., and Marsault,  N., 1998, “Partial Hydrodyanmic Lubrication With Large Fractional Contact,” ASME J. Tribol., 120, pp. 16–20.
Sutcliffe,  M. P. F., 1999, “Flattening of Random Rough Surfaces in Metal Forming Processes,” ASME J. Tribol., 121, pp. 433–440.
Korzekwa,  D. A., Dawson,  P. R., and Wilson,  W. R. D., 1992, “Surface Asperity Deformation During Sheet Forming,” Int. J. Mech. Sci. 34, pp. 521–539.

Figures

Grahic Jump Location
Schematic of inlet and MPHL lubrication mechanisms
Grahic Jump Location
Evolution of the hydrodynamic pressure and contact ratio in the inlet zone for the first pass on shot-blast hot band, t1=4.0 mm,Ur=1−100 m/s,Rq=7.5 μm, and L0=0.3 mm
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Schematic of flattening of an asperity (a) with partial oil penetration and (b) with full oil penetration
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Comparison between the current model and the model by Sutcliffe et al. 10 in cold rolling, t1=4.0 mm,Ur=3 m/s,r=15 percent,L0=0.3 mm,A0=0.6, and θ=15 deg
Grahic Jump Location
Comparison between the current model and the model by Sutcliffe et al. 10 in strip drawing, t1=4.1 mm,U2=0.017 m/s,r=15 percent,L0=0.3 mm,A0=0.6, and θ=15 deg
Grahic Jump Location
Comparison between measurements and theory of the change in pit volume in drawing of bright-annealed strip with Vickers indentation
Grahic Jump Location
Comparison between measurements and theory of the change in pit area of shot-blast hot band during strip drawing
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Comparison between measurements and theory of the change in pit area of shot-blast hot band during rolling
Grahic Jump Location
Effect of rolling speed on the lubrication regime map. The curves track the evolution of lubrication regime through a pass schedule: t1=4.0 mm,Ur=3 m/s−10 m/s,r=15 percent, and θ=15 deg.
Grahic Jump Location
Effect of pit slope on the lubrication regime map. The curves track the evolution of lubrication regime through a pass schedule: t1=4.0 mm,Ur=3 m/s,r=15 percent, and θ=15 deg−30 deg.

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