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- Bergseth, Ellen
(författare)
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Virtual Hobbing
- 2007
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Konferensbidrag (populärvet., debatt m.m.)abstract
- Hobbing is a widely used machining process to generate high precision external spur and helical gears. The life of thehob is determined by wear and other surface damage. In this report, a CAD approach is used to simulate the machiningprocess of a gear tooth slot. Incremental removal of material is achieved by identifying contact lines. The paper presentsan example of spur gear generation by means of an unworn and a worn hob. The two CAD-generated gear surfaces arecompared and showed form deviations.
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- Bergseth, Ellen, et al.
(författare)
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Wear in environmentally adapted lubricants with AW/EP technology
- 2008
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Ingår i: Tech. Akad. Esslingen Int. Tribol. Colloq. Proc.. - 3924813736 - 9783924813734
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Konferensbidrag (refereegranskat)abstract
- Mineral oil based lubricants are dominating the market still. However, there is now a broad range of environmentally adapted lubricants (EAL) based on both natural and synthetic esters. Wear was studied in a pin-on-disc-machine giving the wear coefficient. The surface reactions formed by the additives were examined. The studied lubricants were formulated with a complex ester as the base fluid. The wear number decreased with increasing reacted surface layer depth as well as with increasing oxide layer. A highly polar base fluid gave relatively low wear numbers even without additives. This is an abstract of a paper presented at the 16th International Colloquium Tribology Lubricants Materials and Lubrication Engineering (Stuttgart/Ostfildern, Germany 1/15-17/2008).
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| 4. |
- Bergseth, Ellen, et al.
(författare)
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Wear in environmentally adapted lubricants with AW technology
- 2008
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Ingår i: Journal of Synthetic Lubrication. - : Wiley. - 1557-6841 .- 0265-6582. ; 25:4, s. 137-158
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the study was to examine the tribofilm formation and the corresponding wear occurring in the boundary lubrication regime in environmentally adapted lubricants, i.e. when using synthetic ester base fluids with different anti-wear additives. AW additives of the following types were studied: phosphorus, sulphur–phosphorus and sulphur–nitrogen together with an additive based on carbon, hydrogen, oxygen and nitrogen chemistry. In addition, the base fluid itself was tested.Wear was studied in a pin-on-disc-machine giving the wear coefficient. The surfaces were analysed by glow discharge-optical emission spectroscopy, revealing the surface reactions formed by the additives. The results indicate that the wear number decreases with increasing reacted surface layer depth as well as with increasing oxide layer depth. Also, the results indicate that a highly polar base fluid give relatively low wear numbers even without additives.
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