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Lubricants 2017, 5(1), 3; doi:10.3390/lubricants5010003

The Influence of Tool Texture on Friction and Lubrication in Strip Reduction Testing

1
Department of Mechanical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
2
Mechanical Engineering Programme, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editor: James E. Krzanowski
Received: 28 October 2016 / Revised: 7 December 2016 / Accepted: 4 January 2017 / Published: 17 January 2017
(This article belongs to the Special Issue Tribology in Manufacturing Process)
View Full-Text   |   Download PDF [10449 KB, uploaded 17 January 2017]   |  

Abstract

While texturing of workpiece surfaces to promote lubrication in metal forming has been applied for several decades, tool surface texturing is rather new. In the present paper, tool texturing is studied as a method to prevent galling. A strip reduction test was conducted with tools provided with shallow, longitudinal pockets oriented perpendicular to the sliding direction. The pockets had small angles to the workpiece surface and the distance between them were varied. The experiments reveal that the distance between pockets should be larger than the pocket width, thereby creating a topography similar to flat table mountains to avoid mechanical interlocking in the valleys; otherwise, an increase in drawing load and pick-up on the tools are observed. The textured tool surface lowers friction and improves lubrication performance, provided that the distance between pockets is 2–4 times larger than the pocket width. Larger drawing speed facilitates escape of the entrapped lubricant in the pockets. Testing with low-to-medium viscosity oils leads to a low sheet roughness on the plateaus, but also local workpiece material pick-up on the tool plateaus. Large lubricant viscosity results in higher sheet plateau roughness, but also prevents pick-up and galling. View Full-Text
Keywords: tool surface texture; lubricant entrapment; strip drawing test tool surface texture; lubricant entrapment; strip drawing test
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sulaiman, M.H.; Christiansen, P.; Bay, N. The Influence of Tool Texture on Friction and Lubrication in Strip Reduction Testing. Lubricants 2017, 5, 3.

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