Surface Properties of Tailored Forming Thrust Bearings

authored by: Gerhard Poll, Bernd-Arno Behrens, Aleksandr Chugreev, Tim Matthias, Florian Pape, Timm Coors
Abstract: The surface properties of rolling bearings are fundamental to avoid wear and early failures. In our case, Tailored Forming cylindrical thrust roller bearings were investigated. Through laser cladding or plasma-transferred-arc welding, a lower grade base steel can be combined with a high strength steel acting as cladding for rolling contact loads. A subsequent forging process is applied to benefit from process- and material-specific advantages. Fatigue tests were conducted to assess the bearings. Prior and after the tests, the bearing surfaces were investigated by nano-indentation studies. Nano-scratch tests were performed to determine the frictional and mechanical surface properties. The measurements were carried out on a Bruker (formerly Hysitron) TI950 TriboIndenter by applying a spherical diamond cone tip with a radius of 300 nm. The travel length of the tip on the surface was 8 µm. Each test was performed in three steps: initially, the surface contour was scanned by the tip under very low load on one path (pre-scan). Next, the scratch was performed on the same route with a final force of 1 mN (scratch). Finally, the plastically deformed material was analysed in a post-scan. During the test, the coefficient of friction was evaluated. The measured surface properties were compared to thrust bearings made from conventional 100Cr6 bearing steel.
Organisation(s): Institute of Machine Elements and Engineering Design
Institute of Metal Forming and Metal Forming Machines
Type: Poster
Publication date: 2019
Publication status: Published
: Details in the research portal "Research@Leibniz University"

BibTeX

@conference{902e8abf57494b3aa71194d25b717118,
title = "Surface Properties of Tailored Forming Thrust Bearings",
abstract = "The surface properties of rolling bearings are fundamental to avoid wear and early failures. In our case, Tailored Forming cylindrical thrust roller bearings were investigated. Through laser cladding or plasma-transferred-arc welding, a lower grade base steel can be combined with a high strength steel acting as cladding for rolling contact loads. A subsequent forging process is applied to benefit from process- and material-specific advantages. Fatigue tests were conducted to assess the bearings. Prior and after the tests, the bearing surfaces were investigated by nano-indentation studies. Nano-scratch tests were performed to determine the frictional and mechanical surface properties. The measurements were carried out on a Bruker (formerly Hysitron) TI950 TriboIndenter by applying a spherical diamond cone tip with a radius of 300 nm. The travel length of the tip on the surface was 8 µm. Each test was performed in three steps: initially, the surface contour was scanned by the tip under very low load on one path (pre-scan). Next, the scratch was performed on the same route with a final force of 1 mN (scratch). Finally, the plastically deformed material was analysed in a post-scan. During the test, the coefficient of friction was evaluated. The measured surface properties were compared to thrust bearings made from conventional 100Cr6 bearing steel.",
author = "Gerhard Poll and Bernd-Arno Behrens and Aleksandr Chugreev and Tim Matthias and Florian Pape and Timm Coors",
year = "2019",
language = "English",
note = "Nanobruecken 2019 ; Conference date: 19-02-2019 Through 21-02-2019",
}