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TECHNICAL PAPERS

Influence of Workpiece Surface Topography on the Mechanisms of Liquid Lubrication in Strip Drawing

[+] Author and Article Information
Ichiro Shimizu

Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, 700-8530 Okayama, Japan

Jan L. Andreasen, Jakob I. Bech, Niels Bay

Department of Manufacturing Engineering, Technical University of Denmark, Building 425, 2800 Lyngby, Denmark

J. Tribol 123(2), 290-294 (May 23, 2000) (5 pages) doi:10.1115/1.1308017 History: Received February 23, 2000; Revised May 23, 2000
Copyright © 2001 by ASME
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References

Steinhoff,  K., Rasp,  W., and Pawelski,  O., 1996, “Development of Deterministic-Stochastic Surface Structures to Improve the Tribological Conditions of Sheet Forming Processes,” J. Mater. Process. Technol., 60, pp. 355–361.
Schmoeckel,  D., Prier,  M., and Staeves,  J., 1997, “Topography Deformation of Sheet Metal During the Forming Process and Its Influence on Friction,” Ann. CIRP, 46, No. 1, pp. 175–178.
Kudo,  H., Tanaka,  S., Imamura,  K., and Suzuki,  K., 1976, “Investigation of Cold Forming Friction and Lubrication with a Sheet Drawing Test,” Ann. CIRP, 25, pp. 179–184.
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.
Azushima,  A., Tsubouchi,  M., Kudo,  H., Furuta,  N., and Minemura,  K., 1989, “Experimental Confirmation of the Micro-Plasto-Hydrodynamic Lubrication Mechanism at the Interface between Workpiece and Forming Die,” J. JSTP, 30, No. 347, pp. 1631–1638 (in Japanese).
Azushima, A., Tsubouchi, M., and Kudo, H., 1990, “Direct Observation of Lubricant Behaviors under the Micro-PHL at the Interface between Workpiece and Die,” Adv. Technol. Plas., Proc. 3rd International Conference on Technology of Plasticity, Kyoto, Vol. 1, pp. 551–556.
Azushima,  A., and Yamamiya,  M., 1992, “Investigation of Factors Affecting the Coefficient of Friction and Surface Properties with a Sheet Drawing Test,” Ann. CIRP, 41, No. 1, pp. 259–262.
Kudo, H., and Azushima, A., 1987, “Interaction of Surface Microstructure and Lubricant in Metal Forming Tribology,” Adv. Technol. Plas., Proc. 2nd International Conference on Technology of Plasticity, Stuttgart, Vol. 1, pp. 373–384.
Bech,  J. I., Bay,  N., and Eriksen,  M., 1999, “Entrapment and Escape of Liquid Lubricant in Metal Forming,” Wear, 232, pp. 134–139.
So̸rsensen,  C. G., Bech,  J. I., Andreasen,  J. L., Bay,  N., Engel,  U., and Neudecker,  T., 1999, “A Basic Study of the Influence of Surface Topography on Mechanisms of Liquid Lubrication in Metal Forming,” Ann. CIRP, 48, No. 1, pp. 203–208.
Shimizu, I., 1999, “Lubrication Mechanisms during Strip Drawing,” Techn. Univ. Denmark, MM-report No. 99.13.
Bech, J. I., 1997, “Lubrication Mechanisms in Metal Forming,” Techn. Univ. Denmark, MM-report No. 97.79.
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.

Figures

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Models explaining the escape of trapped lubricant in strip drawing (Azushima et al. 5). (a) Forward escape by microplasto hydrostatic lubrication (MPHSL), q0>p. (b) Backward escape by microplasto hydrodynamic lubrication (MPHDL), q0+q>p.
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Shape and dimensions of workpiece and position of lubricant pockets
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Cross section of small, medium and large size lubricant pockets
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Profile of pockets before and after electropolishing
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Example on three-dimensional illustration of pocket shape together with cross section profile
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Schematic view of the strip drawing setup
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Die pressure distribution
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Variation in maximum pressure of lubricant, q0+q with varying angle to the pocket edge β, radius of curvature on edge R, drawing speed u and minimum film thickness hm for q0=220, 230, and 240 MPa
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Examples on lubricant permeation for small and large pockets without and with electropolishing
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Relationship between length of backward permeation and radius of curvature on pocket edge
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Relationsuip between onset reduction for MPHDL and radius of curvature on pocket edge
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Required liquid pressure for MPHDL versus radius of curvature on pocket edge with hydrostatic pressure, minimum film thickness, and pocket size as parameters. Curves correspond to theoretical calculations, marker points to experimental results.

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