Abstract
The process machining of metal occurs increasing friction force and high temperature, consequently will affect the wear of tool and product quality. The cooling method contributes significantly to reduce heat, friction force and surface roughness of workpiece. The cooling method that used must develop to aim environmental machining process with minimum quantity lubrications (MQL) and dry cutting, but the dry cutting has limited performance because of low lubrications. The MQL using nanofluid base natural oil/water is major challenge in cooling method. In this study in order to aim high performance of cooling, the bionanofluid formed from high thermal conductivity of nanoparticles (50 nm) emulsifier by water and bio oil as base fluid in MQL process by injection of low temperature of air. To improve the cooling performance, it used cool air as injection pressure, designed by utilizing the evaporative process refrigerant flow with the counter flow direction. The experimental results show the lowest roughness was obtained from Titanium Dioxide TiO2 with palm oil-based fluid, followed Aluminum Oxide (Al2O3) based on coconut oil occurring, the last CuO in a water-based fluid. TiO2 most dispersing compared to others and correlates to cooling performance, it can be candidates for coolants for machining.
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