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This research was co-financed from the state budget under the program of the Minister of
Science and Higher Education of the Republic of Poland called “Polish Metrology II” (project number
PM-II/SP/0040/2024/2 “Multisensory system for measuring thermo-mechanical interactions with comprehensive condition analysis”). Project funding amount: PLN 968,000.00, total project value:
PLN 968,000.00.
The use of the minimum quantity lubrication (MQL) method during machining leads
to the reduced consumption of cooling and lubricating liquids, thus contributing to sustainable
machining. To improve the properties of liquids used under MQL conditions, they are enriched
with various types of micro- and nanoparticles. The purpose of this study was to investigate the
effect of the addition of graphite micropowder (GMP) on tool life, cutting force components, and
selected surface roughness parameters during the finish turning of the Ti-6Al-4V titanium alloy
under MQL conditions. The addition of 0.6 wt% of GMP to the base liquid in machining under MQL
conditions leads to an extension of tool life by 7% and 96% compared to machining with a liquid
without the addition of GMP and dry machining, respectively. Mathematical models of the cutting
force components and surface roughness parameters were developed, taking into account the change
in cutting speed and feed. It was found that the use of a liquid with the addition of GMP extends
the range of cutting parameters for which the shape of chips obtained is acceptable in terms of work
safety. The novelty of this study lies in the use of a cutting fluid composed of bis(2-ethylhexyl) adipate
and diester, enriched with graphite micropowder, which has not been extensively investigated for
machining titanium alloys under MQL conditions.