Tribological Analysis of Treated Recycled Vegetable Oil-Based Lubricants for MQL Machining
DOI:
https://doi.org/10.63746/njtd.v22i1.2929Keywords:
Treated Recycled Vegetable Oil (TRVO), Minimum Quantity Lubrication (MQL), Sustainable Machining, Pin-on-disk Test, TribologyAbstract
Machinability in metal cutting is heavily reliant on the cutting fluids to lubricate and reduce friction and wear between surfaces. Thus, this study investigates the tribological performance of treated recycled vegetable oil (TRVO) as a sustainable biodegradable lubricant in minimum quantity lubrication (MQL) machining. The used palm-based cooking oil was recycled and treated through a series of filtering processes, which was then characterized for its viscosity. Its tribological performance was analysed through pin-on-disc tests using a tribometer with uncoated tungsten carbide pins and mild steel discs. The study mimicked the milling cutting condition by employing tool material for the pin and replicating the wear, frictional force, coefficient of friction, and pin temperature that are typically observed in milling processes. The sliding tests showed TRVO, with a viscosity of 41.05 cSt, led to an average wear, frictional force, coefficient of friction, and pin temperature of 16.219 µm, 0.1494 N, 0.0013, and 23.80 °C, respectively after 1 hour of running. The continuous rubbing action also affected heat-dependent variables such as surface roughness and microhardness which correlated strongly with the tribological properties of TRVO. The findings demonstrate the potential of TRVO as an effective for conventional cutting fluids, promoting sustainability in the machining processes.
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