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TECHNICAL PAPERS

A Study of the Lubrication Behavior of Solid Lubricants in the Upsetting Process

[+] Author and Article Information
Tamotsu Nakamura, Shigekazu Tanaka, Kunio Hayakawa, Yoshiaki Fukai

Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561, Japan

J. Tribol 122(4), 803-808 (Mar 22, 2000) (6 pages) doi:10.1115/1.1310159 History: Received December 14, 1999; Revised March 22, 2000
Copyright © 2000 by ASME
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References

Figures

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Schematic illustration of friction testing apparatus to evaluate frictional characteristics of solid lubricant
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Schematic illustration of testing apparatus to measure yield shear stress of solid powder lubricant
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Relationship between frictional shear stress τf or yield shear stress k of four kinds of solid lubricant and punch pressure p
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Friction coefficients μ of solid lubricants with the punch pressure p
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Microscopic observations of solid lubricants after friction tests
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FEM simulation model for upsetting of circular blank
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Some results of flow pattern of workmetal and lubricant by FEM simulation (μM=0.15,μD=0.05)
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Variations of thickness distribution of solid lubricant film during upsetting process (μM=0.15,μD=0.05)
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Some results of flow pattern of workmetal and lubricant by FEM simulation (μM=0.15,μD=0.10)
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Variations of thickness distribution of solid lubricant film during upsetting process (μM=0.15,μD=0.10)
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Variation of outer rim radius rf of solid lubricant with friction coefficient μD at constant high friction μM=0.15
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Variation of outer rim radius rf of solid lubricant with friction coefficient μD at constant low friction μM=0.05
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Variation of critical reduction in height (Re)cr by friction coefficients μD and μM
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Some examples of workmetal upset until Re=60 percent by smooth surface dies
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Experimental plots on diagram showing metal to metal contact area obtained by FEM simulations (μM=0.05)
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Friction surfaces of workmetal and tool during upsetting by rough surface dies of Ry=1.8 μm with PTFE lubricant

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