Experimental Study of Drilling Temperature, Geometrical Errors and Thermal Expansion of Drill on Hole Accuracy When Drilling CFRP/Ti Alloy Stacks

Autor: Vitalii Kolesnyk, Jozef Peterka, Marcel Kuruc, Vladimír Šimna, Jana Moravčíková, Tomáš Vopát, Dmytro Lisovenko
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Materials, Vol 13, Iss 14, p 3232 (2020)
Druh dokumentu: article
ISSN: 1996-1944
DOI: 10.3390/ma13143232
Popis: The drilling of holes in CFRP/Ti (Carbon Fiber-Reinforced Plastic/Titanium alloy) alloy stacks is one of the frequently used mechanical operations during the manufacturing of fastening assemblies in temporary civil aircraft. A combination of inhomogeneous behavior and poor machinability of CFRP/Ti alloy stacks in one short drilling brought challenges to the manufacturing community. The impact of the drilling temperature and time delay factor under various cutting conditions on hole accuracy when machining CFRP/Ti alloy stacks is poorly studied. In this paper, the drilling temperature, the phenomenon of thermal expansion of the drill tool, and hole accuracy are investigated. An experimental study was carried out using thermocouples, the coordinate measuring machine method, and finite element analysis. The results showed that the time delay factor varied from 5 (s) to 120 (s), influences the thermal-dependent properties of CFRP, and leads to an increase in hole roundness. Additionally, the thermal expansion of the drill significantly contributes to the deviation of the hole diameter in Ti alloy.
Databáze: Directory of Open Access Journals
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