Abstract
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.
Highlights
Today’s industry is looking for a production system that approaches optimum sustainability.Industrial sectors are looking for processes that present a balanced performance in energy, economic, social, functional, and environmental aspects [1,2].The aeronautical sector is noteworthy, being a benchmark in research, development, and innovation
This paper proposes in the the drilling drilling ofofhybrid hybridstructures structures composed of CFRP and alloy UNS A92024, joined by an adhesive
The results shown are very close to those obtained in CFRP
Summary
Today’s industry is looking for a production system that approaches optimum sustainability. The aim is to make a hole in a single step, regardless of the number of plates and the type of material All this must satisfy the quality requirements imposed by the sector and avoid the use of lubricants. Increased fatigue life of the joints, and a wide adaptability to materials [12,13,14] These benefits can be the elimination of defects in the interfaces between them, weightthe reduction, of cutting parameters on the adhesive not been evaluated in previous studies. The effect third material in the interface of the hybrid structure may increase the defects generated during cutting parameters on the adhesive has not been evaluated in previous studies. Athat proposal is presented evaluation of studies the defectology caused in the adhesive joins both materials.for the evaluation of the defectology caused in the adhesive that joins both materials
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