Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Process analysis in the drilling of carbon fiber reinforced composite using different point angles of twisted drills
Submission Author:
Emanuele Schneider Callisaya , SP
Co-Authors:
Emanuele Schneider Callisaya, Rafael Suguita, Marcel Kondo, Manoel Cleber de Sampaio Alves
Presenter: Emanuele Schneider Callisaya
doi://10.26678/ABCM.COBEM2023.COB2023-1484
Abstract
Carbon fiber reinforced polymers (CFRP) are widely used in several industrial areas, due to the countless possibilities of matrix-reinforcement combinations, in addition to different manufacturing techniques, which allow a wide range of customization of the physical and mechanical properties of the material. The thermoset composites are also widely applied in the aerospace and automotive industries, owing to the excellent ratio of high mechanical strength and low specific weight of these materials. However, the manufacturing of these composites faces some challenges such as the occurrence of several damages and failure mechanisms during the drilling machining process, very common in aircraft parts, the most critical of which is delamination, which compromises the performance of the material. Thus, the evaluation of the drilling conditions is necessary in order to guarantee the dimensional accuracy and the surface quality of the holes. In this work the analysis of the influence of tool point angle in the drilling of CFRP is approached with the objective of determining the best conditions for the machining considering the power rating as the response of the process. To evaluate impact in the machining, three twist drills were used with different point angles of 90º, 120º and 140º. The cutting parameters of feed rate (0.02, 0.04 and 0.06 mm/rev) and cutting speed of 6000 rpm were set to the experimental testing. The experimental design (DOE) applied to the drilling was the full factorial design, in order to verify the influence of each input variable (factors), as well as all possible interactions between the levels of each factor. The analyzed output variable was the power consumption during the machining. After the tests a statistical technique of Analysis of Variance (ANOVA) was applied for the results, in addition to quantitative analysis of the drilled holes. Results indicate that point angle of 120º is recommended for lower power consumption.
Keywords
CFRP, Drilling, machining, power consumption
