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TECHNICAL PAPERS

FEM Analysis of Hydrostatic Pressure Generated Within Lubricant Entrapped Into Pocket on Workpiece Surface in Upsetting Process

[+] Author and Article Information
Akira Azushima

Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan

J. Tribol 122(4), 822-827 (Sep 21, 1999) (6 pages) doi:10.1115/1.1286160 History: Received August 11, 1999; Revised September 21, 1999
Copyright © 2000 by ASME
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References

Schey, J. A., 1987, “Friction Laws in Metal Forming Tribology,” keynote paper, Proc. 2nd. Int. Conf. on Adv. Technol. of Plasticity, Stuttgart, pp. 873–882.
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. 373–384.
Kasuga,  Y., and Yamaguchi,  K., 1968, “Friction and Lubrication in the Deformation Processing of Metals,” 1st–3rd Reports Bull. JSME, 11, pp. 344–365.
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.
Shinohara,  M., and Miyagawa,  M., 1978, “Friction and Lubrication in Upsetting of Bar under High Environmental Pressures,” J. Jpn. Soc. Technol. Plast., 19, pp. 926–933.
Butler,  L. H., 1960, “The Influence of Base-Lubricant Viscosity Contact and Friction during Metal Deformation,” J. Inst. Metals,89, pp. 449–455.
Azushima,  A., 1989, “Experimental Confirmation of the Micro-Plasto-Hydrodynamic Lubrication Mechanism at the Interface Between Workpiece and Forming Die,” J. Jpn. Soc. Technol. Plast., 30, pp. 1631–1638.
Makinouchi,  A., Ike,  H., Murakawa,  M., and Koga,  N., 1988, “A Finite Element Analysis of Flattening of Surface Asperities by Perfectly Lubricanted Rigid Dies in Metal Working Processes,” Wear, 128, pp. 109–122.
Osakada,  K., Nakano,  J., and Mori,  K., 1982, “Finite Element Method for Rigid-Plastic Analysis of Metal Forming—Formulation for Finite Deformation,” Int. J. Mech. Sci., 24, pp. 459–468.
Azushima. A., et al., 1991 “Direct Observation of Hydrostatic Pressure Generated within Lubricant Trapped into Pocket on Workpiece Surface,” Proc. 1991 Japanese Spring Conf. Technol of Plasticity, pp. 367–370.

Figures

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Specimens of axisymmetrical upsetting of cylinders having a central conical impression (a) and a central conical dent (b)
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Geometry and finite element discretization of two specimens of cylinders having a central conical impression (a) and a central conical dent (b)
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Distribution of non-dimensional pressure on the surface of cylinder having a central conical impression without oil (a) and with oil (b) (Y: yield stress; p: normal stress; q: hydrostatic pressure; r: reduction)
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Change of the hydrostatic pressure generated within lubricant with reduction when changing coefficient of friction
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Relationship between ratio of real contact area and reduction with oil and without oil in the pocket
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Change of hydrostatic pressure with reduction in height
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Sequential photographs of surface with pyramidal pockets of aluminum sheet being draw through quartz die with a lubricant having a viscosity of 1000 cSt.
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Models to account for oil permeation from surface pocket into real contact area
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Development of plastic area at reduction in height, for specimen B1
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Development of plastic area at reduction in height, for specimen B2
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Development of plastic area at reduction in height, for specimen B3

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