Enhancing Tribological Conditions in Tube Hydroforming by Using Textured Tubes

[+] Author and Article Information
Gracious Ngaile

Department of Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Raleigh, NC 27695gracious_ngaile@ncsu.edu

Mark Gariety, Taylan Altan

Engineering Research Center for Net Shape Manufacturing, The Ohio State University, 339 Baker Systems, 1971 Neil Avenue, Columbus, OH 43210

J. Tribol 128(3), 674-676 (Mar 22, 2006) (3 pages) doi:10.1115/1.2197849 History: Received February 20, 2004; Revised March 22, 2006

The effects of textured tubes on the tribological performance in tube hydroforming (THF) are discussed. Textured surfaces, namely sand blasted, knurled, electrical discharge machined (EDM), and as rolled surfaces, were tested under various interface pressure conditions. Sand blasted textured tubes were found to have the best tribological performance. The study has demonstrated that the increase in the interface pressure between the tube and the die can result in either lower or higher interface friction depending on the surface texture conditions. The study has also shown that different surface texture treatment methods can alter the hardness of the tube surface with significant influence on the tribological performance.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Friction zones in THF

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Figure 2

Experimental setup

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Figure 3

Coefficient of friction versus sliding length for various textured tube surfaces

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Figure 4

Optical micrographs (as rolled, sand blasted, knurled, and EDM tube surfaces)

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Figure 5

Influence of pressure on interface friction (as rolled tube surface)

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Figure 6

Influence of pressure on interface friction (sand blasted tube surface)

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Figure 7

Influence of pressure on interface friction (EDM tube surface)



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