20.500.12556/RUL-152277 Base lubricants for green stamping the effects of their structure and viscosity on tribological performance The requirements for green and sustainable manufacturing mean that stamping lubricants must be continuously re-evaluated and re-designed. In this investigation, the tribological performance of four base oils with different chemical structures (paraffinic and naphthenic) and viscosities (2 and 20 cSt), as well as water, was evaluated for the stamping of steel sheets and compared with a non-lubricated contact. Most lubricants reduce the coefficient of friction and maintain a similar wear coefficient for steel sheets as in dry contacts. Low-viscosity (LV) naphthenic oil performs very like both high-viscosity (HV) oils. A surprising exception is the LV paraffinic oil, with several-times-higher friction and wear compared to dry contact. This is due to the excellent wetting-spreading and very low cohesion forces that enable oil to escape from extremely thin-film contacts because the viscosity is so low, leading to lubricant starvation. In contrast, HV oils provide a sufficiently thick lubricating film, while strong cohesive forces help in the film’s strength, lessening wear, and reducing friction. In thin-film lubrication with LV oils, such as when stamping, it is thus extremely important that the lubricant’s wetting behaviour and viscosity are sufficient to provide enough film in the contact and prevent starvation, thus ensuring lower friction, less wear, and a longer lifetime of the contact. stamping viscosity water paraffinic oil naphthenic oil wetting štancanje viskoznost voda parafinsko olje naftensko olje omočljivost true false true Angleški jezik Slovenski jezik Članek v reviji 2023-11-16 08:29:50 2023-11-16 08:29:54 2023-11-17 03:36:35 0000-00-00 00:00:00 2023 0 0 Str. 1741–1754 iss. 9 Vol. 11 Sep. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.92 2223-7690 10.1007/s40544-022-0706-6 150831619 Polajnar,_Coga,_Kalin_Base_lubricants_for_green_stamping.pdf Polajnar,_Coga,_Kalin_Base_lubricants_for_green_stamping.pdf 1 92F01F8BDE6268C7AB7627D07D7E1FC6 5732ecce66cc140986b86666d4f02d4430ecbe5848c8111049f1176e2704ed89 5da5f674-8452-11ee-b83b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=177678 https://link.springer.com/article/10.1007/s40544-022-0706-6 1 f0eb8933-8451-11ee-b83b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=177675 Fakulteta za strojništvo 0 0 0