Abstract
In nanofluid minimum quantity lubrication (NMQL) grinding of titanium (Ti) alloy, existing nanoparticles cannot solve the technical bottleneck of high surface integrity. Therefore, graphene (GR) nanoparticles, which have excellent lubrication performance, were applied in NMQL. The tribological properties of GR nanofluid on wheel–workpiece interface were studied by friction and wear test. In the experiment, 0.5–3 nm thick GR nanoparticles were used to prepare 3% vol. palm oil-based nanofluid. Ball-disc experiment under grinding conditions was carried out on the friction and wear tester. Grinding balls with SiC abrasive grains (to simulate the grinding wheel) and Ti-6Al-4V disc (to simulate the workpiece) were used. Load force was set for simulation of pressure boundary condition of the grinding wheel–workpiece interface. Stratiform nanoparticles (MoS2, MoO3, and HBN) were used as the comparison group. Results demonstrated that GR nanofluid achieved smaller friction coefficient (0.295), error bars (0.0029), and area of scratches (182,940 μm2). GR nanoparticles with small gravity and large specific surface area improved the viscosity of nanofluid and consequently the lubrication performance. The plane hexagonal honeycomb structure determines the strong lubrication stability and abrasive resistance of the GR nanoparticles. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) images of the scratch surface also verified the above conclusions.
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Abbreviations
- NMQL:
-
Nanofluid minimum quantity lubrication
- GR:
-
Graphene
- HBN:
-
Hexagonal boron nitride
- SEM:
-
Scanning electron microscope
- EDS:
-
Energy dispersive spectrometer
- CNT:
-
Carbon nanotube
- APE-10:
-
Alkylphenol polyoxyethylene ether-10
- F r :
-
Force ratio
- μ :
-
Friction coefficient
- F n :
-
Normal force
- F n ’ :
-
Specific normal force
- F t :
-
Tangential force
- F mr :
-
Force of material removal
- F md :
-
Force of material deformation
- T R-F :
-
Critical time
- F L :
-
Load force
- G(z):
-
Matrix of protrusion height of grains
- G(d):
-
Matrix of grain size
- G(zg):
-
Matrix of axial position of generated grains
- λ :
-
Distance between two abrasive grains
- a gmax( n) :
-
Maximum undeformed chip thickness
- λ ( n~ n−1) :
-
Distance between the dynamic effective abrasive grain n and n − 1
- a p( n) :
-
Extruding height of the dynamic effective abrasive grain n
- a p( n−1) :
-
Extruding height the dynamic effective abrasive grain n − 1
- V s :
-
Peripheral speed of grinding wheel
- V w :
-
Feed speed
- F s :
-
Average normal action force of single abrasive grain
- b :
-
Grinding width
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Funding
This research was financially supported by the following foundations: the National Natural Science Foundation of China (51575290), the Major Research Project of Shandong Province (2017GGX30135 and 2018GGX103044), and the Shandong Provincial Natural Science Foundation, China (ZR2019PEE008).
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Cui, X., Li, C., Zhang, Y. et al. Tribological properties under the grinding wheel and workpiece interface by using graphene nanofluid lubricant. Int J Adv Manuf Technol 104, 3943–3958 (2019). https://doi.org/10.1007/s00170-019-04129-8
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DOI: https://doi.org/10.1007/s00170-019-04129-8