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  • Hole quality improvement in CFRP/Ti6Al4V stacks using optimised flow rates for ▫$LCO_2$▫ and MQL sustainable cooling/lubrication [Elektronski vir]
    Rodriguez, Iñigo ...
    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.
    Source: Composite structures [Elektronski vir]. - ISSN 1879-1085 (Vol. 329, [article no.] 117687, Feb. 2024, str. 1-17)
    Type of material - e-article ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 192029443

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S0263822323010334
    Repository of the University of Ljubljana – RUL
    DOI

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