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Surface lay effect on rough friction in roller contact
Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.ORCID iD: 0000-0001-8058-1252
Volvo Car Corporation, Gothenburg, Sweden.
2004 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 257, no 12, p. 1301-1307Article in journal (Refereed) Published
Abstract [en]

Surface lay describes the direction of the predominant surface pattern. A properly designed surface texture configuration has been recognised as a vital issue affecting lubrication and sliding in machinery applications in the literature. Gaining understanding of this tribological phenomenon is no doubt beneficial in facilitating the production of more efficient machine parts and thus reduces production cost. This paper describes an experimental method to investigate the effect of surface lay on lubricated rolling/sliding of ground roller surfaces. By using the rough friction test rig, different surface lay contacts can be simulated and the friction can be measured. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter [ηv/p]). Results show that an optimal contact lay angle that provides a minimum friction value is achievable through rig testing. The relative sliding speed direction has a symmetrical effect on friction at the same lay orientation; for sliding speed angles less than about 80, the larger the angle, the lower the friction, and vice versa. © 2004 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2004. Vol. 257, no 12, p. 1301-1307
Keywords [en]
Surface lay, Surface topography, Contact angle, Friction, Lubrication, Rollers (machine components), Rolling, Roughness, Sliding, Textures, Tribology
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:hh:diva-3559DOI: 10.1016/j.wear.2003.09.006ISI: 000225750700018Scopus ID: 2-s2.0-10044251960OAI: oai:DiVA.org:hh-3559DiVA, id: diva2:284867
Conference
9th International Conference on Metrology & Properties of Engineering Surfaces, Halmstad, Sweden, Sept. 10-11, 2003
Note

Funding: The Swedish Board for Vehicular Research & Volvo

Available from: 2010-01-08 Created: 2009-12-01 Last updated: 2018-01-12Bibliographically approved
In thesis
1. Gear tribology: friction and surface topography
Open this publication in new window or tab >>Gear tribology: friction and surface topography
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The quest for energy efficiency leads to the development of highly efficient power transmissions for vehicles. Gears are some of the most rugged and durable torque transmitters among machine elements. Friction between sliding surfaces at gear teeth is one major source of power loss. To increase efficiency and reduce damage accumulation in gears has always been a background motivation to this thesis. It focuses on the frictional performance of manufactured gear surfaces with emphasis on the effect of surface topography and the orientation of its lay.

To achieve the goal of this work, a test rig was designed and constructed. The rig makes it possible to examine gear tooth friction on double crowned rollers. Five alternative gear-finishing processes are implemented in roller surface preparation. They comprise grinding, shotpeening, phosphating, chemical deburring and DLC coating. Theoretically, a friction model is suggested which helps to explain some of the testing results. Advanced surface metrology techniques and statistical tools are implemented in identifying surface features that influence friction.

The result demonstrates that surface topography is a significant factor affecting the lubricated frictional behaviour. For ground-finishing, the smoother the surfaces are finished, the lower friction coefficient they show. Chemical deburring and DLC coating as well as certain degrees of phosphating provide minimum friction coefficient and improved load carrying capacity, which are competitive to fine-ground finishing. Properly designed lay combinations of meshing gear surfaces can minimise friction and improve gear transmission efficiency. Theoretically, the friction coefficient can be explained by means of a combination of the slide-to-roll ratio and the real mean contact pressure within the range of loads considered in this thesis. Finally, features that correlate surface topography to friction are identified.

Place, publisher, year, edition, pages
Göteborg: Chalmers university of technology, 2005. p. 46
Series
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, ISSN 0346-718X ; 2263
Keywords
Friction, Surface topography, Toughness, Lay, Gears, Power transmission
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-721 (URN)2082/1070 (Local ID)91-7291-581-1 (ISBN)2082/1070 (Archive number)2082/1070 (OAI)
Public defence
2005-04-08, KB Salen, K-huset, Chalmers Tekniska Högskola, Göteborg, 13:00 (English)
Opponent
Supervisors
Available from: 2007-06-11 Created: 2007-06-11 Last updated: 2018-03-23Bibliographically approved
2. Effect of rough surface anisotropy on friction in gears
Open this publication in new window or tab >>Effect of rough surface anisotropy on friction in gears
2002 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Göteborg: Chalmers tekniska högsk., 2002. p. vii, 28
Series
Thesis for the degree of licentiate of engineering, ISSN 1651-0984 ; 8
Keywords
Friction, Surface topography, Roughness, Lay, Gears, Efficiency, Power transmission
National Category
Engineering and Technology Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:hh:diva-1376 (URN)2082/1755 (Local ID)2082/1755 (Archive number)2082/1755 (OAI)
Presentation
(English)
Opponent
Supervisors
Note

Funding: The Swedish Board for Vehicular Research & Volvo

Available from: 2008-04-29 Created: 2008-04-29 Last updated: 2018-01-13Bibliographically approved

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Rosén, Bengt-Göran

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