Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset Laminate
Carbon fibre reinforced composite (CFRP) laminates are widely used in high-tech industries. However, their assembly often requires a drilling process that can create defects. Therefore, studies on the drill tip angle have sought to minimize the surface area affected by these defects and improve the...
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MDPI AG
2025-06-01
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| author | Francisco de A. Toti Amilton J. C. de Freitas José J. de Oliveira Rita de Cássia M. Sales-Contini |
| author_facet | Francisco de A. Toti Amilton J. C. de Freitas José J. de Oliveira Rita de Cássia M. Sales-Contini |
| author_sort | Francisco de A. Toti |
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| description | Carbon fibre reinforced composite (CFRP) laminates are widely used in high-tech industries. However, their assembly often requires a drilling process that can create defects. Therefore, studies on the drill tip angle have sought to minimize the surface area affected by these defects and improve the internal hole quality. In this work, drilling was carried out under dry conditions at a constant cutting speed for four different feed rates in the epoxy–carbon-based thermosetting laminate (EPX-C). Two carbide drills with point angles of 118° and 140° were used. The results showed the occurrence of chipping-type delaminations on both the hole entry and exit surfaces, with the latter being more severely affected. The delamination factor values obtained indicated that the 118° drill performed better than the 140° drill. The results were also compared with those obtained in a previous study using drills with angles of 60° and 130°. Although the values were higher, they followed the same trend of reduction with increasing feed. In terms of surface finish, the average roughness (Ra) values obtained with the 140° drill were better at the lowest feed rate. |
| format | Article |
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| institution | Kabale University |
| issn | 2075-1702 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Machines |
| spelling | doaj-art-ce6f756814bc40d98b6aca404e77587d2025-08-20T03:27:32ZengMDPI AGMachines2075-17022025-06-0113651710.3390/machines13060517Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset LaminateFrancisco de A. Toti0Amilton J. C. de Freitas1José J. de Oliveira2Rita de Cássia M. Sales-Contini3Technological College of Sorocaba, Centro Paula Souza, Av. Eng. Carlos Reinaldo Mendes, 2015—Além Ponte, Sorocaba 18013-280, SP, BrazilTechnological College of Sorocaba, Centro Paula Souza, Av. Eng. Carlos Reinaldo Mendes, 2015—Além Ponte, Sorocaba 18013-280, SP, BrazilTechnological College of Sorocaba, Centro Paula Souza, Av. Eng. Carlos Reinaldo Mendes, 2015—Além Ponte, Sorocaba 18013-280, SP, BrazilTechnological College of São José dos Campos, Centro Paula Souza, Av. Cesare Mansueto Giulio Lattes 1350, Distrito Eugênio de Melo, São José dos Campos 12247-014, SP, BrazilCarbon fibre reinforced composite (CFRP) laminates are widely used in high-tech industries. However, their assembly often requires a drilling process that can create defects. Therefore, studies on the drill tip angle have sought to minimize the surface area affected by these defects and improve the internal hole quality. In this work, drilling was carried out under dry conditions at a constant cutting speed for four different feed rates in the epoxy–carbon-based thermosetting laminate (EPX-C). Two carbide drills with point angles of 118° and 140° were used. The results showed the occurrence of chipping-type delaminations on both the hole entry and exit surfaces, with the latter being more severely affected. The delamination factor values obtained indicated that the 118° drill performed better than the 140° drill. The results were also compared with those obtained in a previous study using drills with angles of 60° and 130°. Although the values were higher, they followed the same trend of reduction with increasing feed. In terms of surface finish, the average roughness (Ra) values obtained with the 140° drill were better at the lowest feed rate.https://www.mdpi.com/2075-1702/13/6/517delamination factorCFRPdrillingthermoset matrixcarbon compositeprocess parameters |
| spellingShingle | Francisco de A. Toti Amilton J. C. de Freitas José J. de Oliveira Rita de Cássia M. Sales-Contini Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset Laminate Machines delamination factor CFRP drilling thermoset matrix carbon composite process parameters |
| title | Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset Laminate |
| title_full | Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset Laminate |
| title_fullStr | Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset Laminate |
| title_full_unstemmed | Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset Laminate |
| title_short | Analysis of the Influence of Drill Tip Geometry on the Dry Drilling Process in CFRP Thermoset Laminate |
| title_sort | analysis of the influence of drill tip geometry on the dry drilling process in cfrp thermoset laminate |
| topic | delamination factor CFRP drilling thermoset matrix carbon composite process parameters |
| url | https://www.mdpi.com/2075-1702/13/6/517 |
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