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Running-in studies of a hydraulic rotator
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-5988-9647
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2007 (English)In: Tribologia : Finnish Journal of Tribology, ISSN 0780-2285, Vol. 26, no 3, p. 3-8Article in journal (Refereed) Published
Abstract [en]

The running-in properties of a hydraulic rotator of vane type for angular positioning of crane tools has been studied. The sliding contact between the vane nose and the stator ring was studied in detail. A pin-on-disc configuration tribometer was used for the tribotests. The pin was made out of a slice from a real vane and the disc was manufactured of the same material and with the same machining process as the real stator ring. Collected data included friction, wear and electric contact resistance. A new method was used to enable measurements of changes in surface topography at a specific location during the test. The results show that the relocation method is useful for monitoring small changes in surface topography under running-in, but the most significant parameter for detection of running-in for this application is electric contact resistance. Significant changes in friction and contact resistance were observed during the running-in period. The main reason for the changes is the build-up of a non-conducting tribofilm. The change in surface topography alone is too small to change the lubricating regime. The tribofilm is formed after a short distance but can not grow until the steepest asperities have been worn off. The results show that the plane milled surface has better running-in properties than the turned surface

Place, publisher, year, edition, pages
2007. Vol. 26, no 3, p. 3-8
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-3421Local ID: 13e9e300-eea2-11dc-a549-000ea68e967bOAI: oai:DiVA.org:ltu-3421DiVA, id: diva2:976279
Note
Godkänd; 2007; Bibliografisk uppgift: Finnish journal of tribology; 20080310 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-13Bibliographically approved

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Pettersson, AndersCarlevi, JensKassfeldt, ElisabetLarsson, Roland

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