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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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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