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Materials 2019, 12(1), 160;

One-Shot Drilling Analysis of Stack CFRP/UNS A92024 Bonding by Adhesive

Faculty of Engineering, Mechanical Engineering and Industrial Design Department, University of Cadiz, Av. Universidad de Cadiz 10, E-11519 Puerto Real, Cadiz, Spain
Author to whom correspondence should be addressed.
Received: 5 December 2018 / Revised: 26 December 2018 / Accepted: 31 December 2018 / Published: 6 January 2019
(This article belongs to the Special Issue Machining—Recent Advances, Applications and Challenges)
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The use of adhesive layers can improve the properties and reduce the defects produced in the interfaces. This provides adherence to the structure, adapting the joining surfaces and avoiding spaces between the layers. However, the presence of the adhesive can potentiate the defects caused during drilling. In turn, a loss of adhesive in the interface can occur during machining affecting the final structure. This work has followed a conventional OSD strategy in CFRP and UNS A92024 aluminium sheet stacking with adhesive. A series of dry drilling tests have been developed with different cutting conditions and new noncoated WC-Co helical cutting tools. Analysis of Variance (ANOVA) statistical analyses and surface response models have been applied to determine the mechanical behaviour in the holes. For this purpose, the dimensional deviation, surface quality, and adhesive loss in the interface in relation to the number of holes have been considered. A combination of cutting parameters that minimizes the evaluated defects has been found. Diametric deviations and surface qualities below 2% and 3.5 µm have been measured in the materials that make up the stack with cutting speeds higher than 140 m/min and feed rates between 200 and 250 mm/min. However, the greatest adhesive losses occur at high cutting speeds. View Full-Text
Keywords: adhesive; machining; modelling; dry; CFRP/UNS A92024 adhesive; machining; modelling; dry; CFRP/UNS A92024

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Bañon, F.; Sambruno, A.; Fernandez-Vidal, S.; Fernandez-Vidal, S.R. One-Shot Drilling Analysis of Stack CFRP/UNS A92024 Bonding by Adhesive. Materials 2019, 12, 160.

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