Experimental Study on High-Speed Milling of SiCf/SiC Composites with PCD and CVD Diamond Tools
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Workpiece Material
2.2. Cutting Tools
2.3. Experimental Setup
3. Results and Discussions
3.1. Tool Wear
3.2. Machined Surface Quality
4. Conclusions
- (1)
- Under dry conditions, large pieces of spalling and edge chipping appeared on the rake face of the CVD diamond tool. On the other hand, minute edge chipping occurred on the PCD tool, and the tool wear was slighter than that of the CVD diamond tool. The PCD tool had better cutting performance than that of the CVD diamond tool. The wear on the rake face and cutting edge was a result of the continuous strike on the tool in the milling process.
- (2)
- The application of cryogenic cooling resulted in a reduction of the wear on both the PCD and CVD diamond tools, leading to increased tool life values. The tool lives of the PCD and CVD diamond tools in cryogenic machining were two and four times higher than those in dry machining, respectively. The tool wear of the PCD end mill was still slighter than that of the CVD diamond end mill under identical milling and cryogenic cooling parameters. Owing to the metallic binder of cobalt (Co) in the PCD tool, the fracture toughness of the PCD tool was higher than that of the CVD diamond tool, resulting in slighter tool wear in machining SiCf/SiC composites.
- (3)
- The material removal mechanisms mainly included fiber breakage, interface debonding and matrix brittle fracture. The main machining defects were fiber burr, fiber stripping, fiber ladder fracture, and edge chipping. The surface quality obtained under dry conditions was lower than that obtained under cryogenic conditions. This was a result of severe tool wear under dry conditions on both PCD and CVD diamond tools. Under cryogenic conditions, the surface quality machined with PCD tool was better than that machined with the CVD diamond tool.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameter | Value |
---|---|
Density (g/cm3) | 2.2–2.5 |
Tensile strength (MPa) | 280–330 |
Elongation (%) | 0.5–0.7 |
Young’s modulus (GPa) | 190–210 |
Bending strength (MPa) | 450–550 |
Name | Blade Length (mm) | Rake Angle (°) | Clearance Angle (°) | Total Length (mm) |
---|---|---|---|---|
PCD tool | 20 | 3 | 10 | 100 |
CVD diamond tool | 4 | 0 | 5 | 80 |
Milling Parameters | Parameter Value |
---|---|
Spindle speed n (rpm) | 10,000 |
Feed speed vf (mm/min) | 3000 |
Cutting width ae (mm) | 6 |
Cutting depth ap (mm) | 0.5 |
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Zhang, B.; Du, Y.; Liu, H.; Xin, L.; Yang, Y.; Li, L. Experimental Study on High-Speed Milling of SiCf/SiC Composites with PCD and CVD Diamond Tools. Materials 2021, 14, 3470. https://doi.org/10.3390/ma14133470
Zhang B, Du Y, Liu H, Xin L, Yang Y, Li L. Experimental Study on High-Speed Milling of SiCf/SiC Composites with PCD and CVD Diamond Tools. Materials. 2021; 14(13):3470. https://doi.org/10.3390/ma14133470
Chicago/Turabian StyleZhang, Bin, Yanan Du, Hanliang Liu, Lianjia Xin, Yinfei Yang, and Liang Li. 2021. "Experimental Study on High-Speed Milling of SiCf/SiC Composites with PCD and CVD Diamond Tools" Materials 14, no. 13: 3470. https://doi.org/10.3390/ma14133470