2026-04-21T03:12:32Zhttps://ebiltegia.mondragon.edu/oai/request

oai:ebiltegia.mondragon.edu:20.500.11984/62892024-05-08T13:12:50Zcom_20.500.11984_473col_20.500.11984_478

00925njm 22002777a 4500 dc rodriguez, Iñigo author ARRAZOLA, PEDRO JOSE author CUESTA ZABALAJAUREGUI, MIKEL author 2024 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 (LCO2) and minimum quantity lubrication (MQL) was supplied through the drilling tool. The effect of varying LCO2 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 LCO2 + MQL with optimised flow rates helps achieve superior quality holes in CFRP, Ti6Al4V and CFRP/Ti6Al4V stacks. 1879-1085 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=174050 https://hdl.handle.net/20.500.11984/6289 CFRP/Ti stacks Cutting temperature LCO2 assisted drilling Surface integrity Optimisation Hole quality improvement in CFRP/Ti6Al4V stacks using optimised flow rates for LCO2 and MQL sustainable cooling/lubrication