Characterization of a New Dry Drill-Milling Process of Carbon Fibre Reinforced Polymer Laminates
Abstract
:1. Introduction
2. Proposed Drill-Milling Process
3. Materials and Methods
3.1. Preparation of the Specimen
3.2. Equipment
3.3. Tool
3.4. Dimensional Analysis
3.5. Surface Finish
4. Results and Discussion
4.1. Cutting Forces
4.2. Metrological Analysis
4.3. Surface Roughness
5. Conclusions
- The maximum values of the thrust cutting force, Fzmax, occurring during the drilling phase are consistent with those obtained in the experimental testing campaigns of traditional drilling.
- In terms of the cutting forces, the results obtained with tool T1 are better than those obtained with tool T2, as lower forces were recorded.
- In both tools, a rapid reduction in the diameter of the hole was observed, due to speedy tool wear growth, and also because the selected WC tools were uncoated.
- Tool T1 responded better in terms of a decrease in the hole diameter, and the use of a coated WC tool could lead to further improvement; it was also observed that the roundness of the hole is maintained with the increasing hole number.
- By comparing the measured roughness parameter values, the trends display a growing tendency with an increasing hole number in all of the cases. Moreover, the Ra roughness values are similar for both tools.
- The Rz roughness parameter values are better for tool T1. From this result, it can be inferred that tool T1 induces a lower fibre pull-out phenomenon in the CFRP.
- The RPc roughness parameter values indicate that the number of peaks per mm inside the CFRP is low, suggesting that the surface finish is good, except for the points where the voids caused by the pull-out phenomenon appear.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Property | Value |
---|---|
Young Modulus 0° | 145 GPa |
Tensile strength 0° | 220 MPa |
Young Modulus 90° | 8.50 GPa |
Tensile strength 90° | 75 MPa |
Revolution | Area of Material Removed (mm2) |
---|---|
1 | 0.46 |
2 | 0.86 |
3 | 0.88 |
4 | 0.90 |
5 | 0.93 |
6 | 0.96 |
7 | 1.00 |
8 | 1.04 |
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Caggiano, A.; Improta, I.; Nele, L. Characterization of a New Dry Drill-Milling Process of Carbon Fibre Reinforced Polymer Laminates. Materials 2018, 11, 1470. https://doi.org/10.3390/ma11081470
Caggiano A, Improta I, Nele L. Characterization of a New Dry Drill-Milling Process of Carbon Fibre Reinforced Polymer Laminates. Materials. 2018; 11(8):1470. https://doi.org/10.3390/ma11081470
Chicago/Turabian StyleCaggiano, Alessandra, Ilaria Improta, and Luigi Nele. 2018. "Characterization of a New Dry Drill-Milling Process of Carbon Fibre Reinforced Polymer Laminates" Materials 11, no. 8: 1470. https://doi.org/10.3390/ma11081470
APA StyleCaggiano, A., Improta, I., & Nele, L. (2018). Characterization of a New Dry Drill-Milling Process of Carbon Fibre Reinforced Polymer Laminates. Materials, 11(8), 1470. https://doi.org/10.3390/ma11081470