Impact of Cryogenic Condition and Drill Diameter on Drilling Performance of CFRP
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Evaluation of Thrust Force and Delamination Factor
3.2. Observation from the SEM and AFM
3.3. Tool Wear
4. Results
- When CFRP is exposed to excessive cold under cryogenic conditions, the temperature of the material decreases extremely. This decrease in the temperature leads to an increase in Young modulus and tensile strength and also makes the material stiffer, more brittle, and fragile. As materials are highly resistant to deformation at low temperatures, the thrust forces generated during the drilling of CFRP in cryogenic conditions are larger when compared with dry conditions.
- The high temperatures that occurred in the dry drilling of CFRP may cause several problems if temperatures in the cutting zone surpass the glass transition temperature of the matrix. As using a cryogenic coolant prevents temperature increase in the cutting zone and provides lubrication, less damaged, smoother, and higher quality surfaces were obtained under cryogenic conditions.
- Owing to the fact that the temperature increase in the cutting zone is small under cryogenic conditions, there is less tool wear compared to dry conditions.
- According to the results of this study, 4 mm diameter drills performed better than 6 mm diameter drills in all tested cases. Smaller diameter drill bits should thus be chosen unless there is a restriction in terms of design.
- Using cryogenic coolant is profitable when drilling CFRP since it enhances machining efficiency by reducing heat occurrence in the cutting zone during machining, rapidly transferring heat from the cutting zone and allowing high-speed machining.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Basmaci, G.; Yoruk, A.S.; Koklu, U.; Morkavuk, S. Impact of Cryogenic Condition and Drill Diameter on Drilling Performance of CFRP. Appl. Sci. 2017, 7, 667. https://doi.org/10.3390/app7070667
Basmaci G, Yoruk AS, Koklu U, Morkavuk S. Impact of Cryogenic Condition and Drill Diameter on Drilling Performance of CFRP. Applied Sciences. 2017; 7(7):667. https://doi.org/10.3390/app7070667
Chicago/Turabian StyleBasmaci, Gültekin, A. Said Yoruk, Ugur Koklu, and Sezer Morkavuk. 2017. "Impact of Cryogenic Condition and Drill Diameter on Drilling Performance of CFRP" Applied Sciences 7, no. 7: 667. https://doi.org/10.3390/app7070667