Abstract
Conventional twist drilling is a widely used machining process for creating holes in aerospace and automobile structures. Drilling at room temperature can sometime affect the quality of machined holes due to increased thermal effects on the workpiece. Thermal effects can be a cumbersome when machining composites and fiber metal laminates due to their different thermal expansion coefficients, which may introduce additional stress in the structure. Thermal machining effects can be minimized using coolants supplied either directly or indirectly to the cutting tool-workpiece interaction zone, to remove away part of the generated heat. The use of coolants adds extra costs for handling, disposal, and environmental impact. Therefore, environmentally friendly cooling technologies are replacing conventional cooling methods to reduce costs and impact on the environment. In addition, the selection of machining parameters has great influence on the hole quality. This paper investigates the impact of drilling parameters and two modern cooling technologies namely cryogenic liquid nitrogen and minimum quantity lubrication on the hole perpendicularity error of fiber metal laminates commercially known as GLARE® (Glass Laminate Aluminum Reinforced Epoxy). It was also found that applying cryogenic liquid nitrogen or minimum quantity lubrication does not lead to an improvement in hole perpendicularity error in GLARE® laminates.
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Acknowledgments
The author would like to thank the Advanced Manufacturing Research Centre (AMRC) at The University of Sheffield for the permission to use their facilities in this research project. The author would also like to thank Dr. Peter J. Kortbeek from the Fibre-Metal Laminate Centre of Competence (FMLC) and Professor Jose Sinke from DELFT University for their technical support on machining GLARE® and material supply. Special thanks to Mr. Jacob Hawxwell and Sandvik Coromant for the assistance with hole perpendicularity measurements.
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Giasin, K. The effect of drilling parameters, cooling technology, and fiber orientation on hole perpendicularity error in fiber metal laminates. Int J Adv Manuf Technol 97, 4081–4099 (2018). https://doi.org/10.1007/s00170-018-2241-1
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DOI: https://doi.org/10.1007/s00170-018-2241-1