20.500.12556/RUL-155658 Hole quality improvement in CFRP/Ti6Al4V stacks using optimised flow rates for LCO$_2$ and MQL sustainable cooling/lubrication Carbon fibre reinforced polymer/titanium stacks (CFRP/Ti6Al4V) are employed in aeronautics due to their excellent weight-to-strength ratio and corrosion properties. However, these same material properties present challenges for hole making which cannot be solved using conventional water-based metalworking fluids (MWFs), as they cause degradation of the composite. Moreover, environmental and health concerns require exploration of alternative cooling/lubrication solutions. In this study, a controlled mixture of liquid carbon dioxide (LCO$_2$) and minimum quantity lubrication (MQL) was supplied through the drilling tool. The effect of varying LCO$_2$ and MQL flow rates was evaluated on cutting forces, temperatures, and several hole quality outputs. The optimal flow rates were then determined through multi-objective optimisation. The results show that the cooling/lubrication flow rate greatly affects the measured outputs, and that supplying LCO$_2$ + MQL with optimised flow rates helps achieve superior quality holes in CFRP, Ti6Al4V and CFRP/Ti6Al4V stacks. CFRP/Ti stacks cutting temperature ▫$LCO_2$▫ assisted drilling surface integrity optimisation CFRP/Ti strukture temperatura odrezavanja vrtanje z asistenco ▫$LCO_2$▫ integriteta površine optimizacija true false true Angleški jezik Slovenski jezik Članek v reviji 2024-04-10 11:13:34 2024-04-10 11:13:41 2025-03-20 09:00:05 0000-00-00 00:00:00 2024 0 0 17 str. Vol. 329, art. 117687 Feb. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.9 1879-1085 10.1016/j.compstruct.2023.117687 192029443 Rodiguez...-Hole_quality_improvement_in_CFRP....pdf Rodiguez...-Hole_quality_improvement_in_CFRP....pdf 1 B67CD39150A491EE58B6E2A76129C2B5 3338d5ec6f2c29990d6df54095ee30fe5459aaf330dd4ed53659bfb63bd981d2 5ba52fd7-f71b-11ee-ae5d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=182665 https://www.sciencedirect.com/science/article/pii/S0263822323010334 1 9f1c69d6-f71a-11ee-ae5d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=182664 Fakulteta za strojništvo 0 0 0