Hole quality improvement in CFRP/Ti6Al4V stacks using optimised flow rates for ▫$LCO_2$▫ and MQL sustainable cooling/lubrication

Rodriguez, Iñigo (author), Arrazola, P. J. (author), Cuesta, Mikel (author), Pušavec, Franci (author)

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.

• Language: English
• Keywords: CFRP/Ti stacks, cutting temperature, ▫$LCO_2$▫ assisted drilling, surface integrity, optimisation
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 17 str.
• Numbering: Vol. 329, art. 117687
• PID: 20.500.12556/RUL-155658
• UDC: 621.9
• ISSN on article: 1879-1085
• DOI: 10.1016/j.compstruct.2023.117687
• COBISS.SI-ID: 192029443
• Publication date in RUL: 10.04.2024

Record is a part of a journal

• Title: Composite structures
• Shortened title: Compos. struct.
• Publisher: Elsevier
• ISSN: 1879-1085
• COBISS.SI-ID: 19024387

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: CFRP/Ti strukture, temperatura odrezavanja, vrtanje z asistenco ▫$LCO_2$▫, integriteta površine, optimizacija