Effect of Lubricant Type on the Friction Behaviours and Surface Topography in Metal Forming of Ti-6Al-4V Titanium Alloy Sheets

The aim of the research described in this paper is to analyse the synergistic effect of types of synthetic oil and their density on the value of the coefficient of friction (COF) of Ti-6Al-4V titanium alloy sheets. Lubrication performance of commercial synthetic oils (machine, gear, engine and hydra...

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Bibliographic Details
Published in:Materials 2021-07, Vol.14 (13), p.3721
Main Authors: Szpunar, Marcin, Trzepieciński, Tomasz, Żaba, Krzysztof, Ostrowski, Robert, Zwolak, Marek
Format: Article
Language:English
Subjects:
Artificial neural networks
Coefficient of friction
Corrosion resistance
Friction
Galling
Lubricants
Lubricants & lubrication
Lubrication
Metal forming
Metal sheets
Strip
Synergistic effect
Tensile tests
Titanium alloys
Titanium base alloys
Tribology
Values
Viscosity
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Summary:The aim of the research described in this paper is to analyse the synergistic effect of types of synthetic oil and their density on the value of the coefficient of friction (COF) of Ti-6Al-4V titanium alloy sheets. Lubrication performance of commercial synthetic oils (machine, gear, engine and hydraulic) was tested in a strip draw friction test. The friction tests consisted of pulling a strip specimen between two cylindrical fixed countersamples. The countersamples were placed in the simulator base mounted on a uniaxial tensile test machine. Due to the complex synergistic effect of different strip drawing test parameters on the COF, artificial neural networks were used to find this relationship. In the case of both dry and lubricated conditions, a clear trend was found of a reduction of the coefficient of friction with nominal pressure. Engine oil 10W-40 was found to be the least favourable lubricant in reducing the coefficient of friction of Grade 5 titanium sheets. The two main tribological mechanisms, i.e., galling and ploughing, played the most important role in the friction process on the test sheets. In the range of nominal pressures considered, and with the synthetic oils tested, the most favourable lubrication conditions can be obtained by using a type of oil with a low viscosity index and a high kinematic viscosity.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14133721