Improving drillability of wrought and AM Ti6Al4V through environmentally friendly soybean oil-based nanofluids

In the last few years, the laws of materials machining under the flood conditions have become stricter due to environment and human health concern. For this reason, with the aim of enhancing the sustainability of the process while maintaining the cooling and lubrication properties, the use of vegetable oil-based metalworking fluids has been developed alongside Minimum Quantity Lubrication technology. In this thesis the results of the analyses of Tungsten Carbides (WC) tool wear in drilling, under pure soybean vegetable oil MQL and 0,1% w/w alumina soybean based nanofluid MQL, Ti6Al4V obtained through EBM (Electron Beam Melting) and conventional methods are reported and discussed. Moreover, the variation of the cutting force was measured, compared among the working environments and correlated to the tool wear analysis. Afterwards, the holes quality was determined in terms of surface roughness estimation. For nanofluid minimum quantity lubrication (NFMQL) the addition of a surfactant and two steps methodology preparation were selected to increase the nanoparticles dispersion and fluid homogenization. Then, NPs morphology and dispersion analysis test were performed. At the end, both fluids were characterized in terms of specific heat capacity through Differential Scanning Calorimetry Method.