Micromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laser
To enhance the cutting performance of chemical vapor deposit (CVD) diamond-coated tool, a short pulse laser grinding technique is applied. However, the thermal impact of a nanosecond laser damages the diamond crystallinity of the processed surface. To reduce this thermal impact, a femtosecond laser...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2020-05-01
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| Series: | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jamdsm/14/4/14_2020jamdsm0059/_pdf/-char/en |
| _version_ | 1818107790492696576 |
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| author | Xiaoxu LIU Kohei NATSUME Satoru MAEGAWA Fumihiro ITOIGAWA |
| author_facet | Xiaoxu LIU Kohei NATSUME Satoru MAEGAWA Fumihiro ITOIGAWA |
| author_sort | Xiaoxu LIU |
| collection | DOAJ |
| description | To enhance the cutting performance of chemical vapor deposit (CVD) diamond-coated tool, a short pulse laser grinding technique is applied. However, the thermal impact of a nanosecond laser damages the diamond crystallinity of the processed surface. To reduce this thermal impact, a femtosecond laser is innovatively used in this study to conduct the pulse laser grinding (PLG) of a CVD diamond-coated cutting tool, to achieve a sharpened tool edge with high quality. Furthermore, the CVD diamond tool edges processed by femtosecond and nanosecond lasers are compared based on sharpness, smoothness, and microstructure changes. The results show that a sufficient laser fluence higher than the threshold and a reduction in the pulse overlapping rate of the laser fluence of the femtosecond laser PLG could ensure a better tool edge shaping. A laser power of 7 W, processing angle of 20°, and scanning speed of 60 mm/s with roughness reduced to approximately half, are the suitable processing conditions of the femtosecond laser. From the observation of a scanning electron microscope, the tool edge processed by femtosecond laser PLG has a relatively sharp edge, with a radius of curvature around 1 μm, similar to that of a nanosecond laser. The further magnified images reveal a distinct processed surface characteristic. The nanosecond laser-processed surface has obvious longitudinal machining marks while that of the femtosecond laser has ablated debris. Moreover, the surface microstructure change of CVD diamond by femtosecond and nanosecond laser PLG are compared using Raman spectroscopy, further confirming that femtosecond laser could successfully suppress unfavorable structural effects in CVD diamond. Based on the results, femtosecond laser has a great potential for processing higher-quality CVD diamond tool edges. |
| first_indexed | 2024-12-11T02:05:04Z |
| format | Article |
| id | doaj.art-15bd2a88832d4f88b8cc51f69e6b72e2 |
| institution | Directory Open Access Journal |
| issn | 1881-3054 |
| language | English |
| last_indexed | 2024-12-11T02:05:04Z |
| publishDate | 2020-05-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| spelling | doaj.art-15bd2a88832d4f88b8cc51f69e6b72e22022-12-22T01:24:25ZengThe Japan Society of Mechanical EngineersJournal of Advanced Mechanical Design, Systems, and Manufacturing1881-30542020-05-01144JAMDSM0059JAMDSM005910.1299/jamdsm.2020jamdsm0059jamdsmMicromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laserXiaoxu LIU0Kohei NATSUME1Satoru MAEGAWA2Fumihiro ITOIGAWA3Department of Electrical and Mechanical Engineering, Nagoya Institute of TechnologyDepartment of Electrical and Mechanical Engineering, Nagoya Institute of TechnologyDepartment of Electrical and Mechanical Engineering, Nagoya Institute of TechnologyDepartment of Electrical and Mechanical Engineering, Nagoya Institute of TechnologyTo enhance the cutting performance of chemical vapor deposit (CVD) diamond-coated tool, a short pulse laser grinding technique is applied. However, the thermal impact of a nanosecond laser damages the diamond crystallinity of the processed surface. To reduce this thermal impact, a femtosecond laser is innovatively used in this study to conduct the pulse laser grinding (PLG) of a CVD diamond-coated cutting tool, to achieve a sharpened tool edge with high quality. Furthermore, the CVD diamond tool edges processed by femtosecond and nanosecond lasers are compared based on sharpness, smoothness, and microstructure changes. The results show that a sufficient laser fluence higher than the threshold and a reduction in the pulse overlapping rate of the laser fluence of the femtosecond laser PLG could ensure a better tool edge shaping. A laser power of 7 W, processing angle of 20°, and scanning speed of 60 mm/s with roughness reduced to approximately half, are the suitable processing conditions of the femtosecond laser. From the observation of a scanning electron microscope, the tool edge processed by femtosecond laser PLG has a relatively sharp edge, with a radius of curvature around 1 μm, similar to that of a nanosecond laser. The further magnified images reveal a distinct processed surface characteristic. The nanosecond laser-processed surface has obvious longitudinal machining marks while that of the femtosecond laser has ablated debris. Moreover, the surface microstructure change of CVD diamond by femtosecond and nanosecond laser PLG are compared using Raman spectroscopy, further confirming that femtosecond laser could successfully suppress unfavorable structural effects in CVD diamond. Based on the results, femtosecond laser has a great potential for processing higher-quality CVD diamond tool edges.https://www.jstage.jst.go.jp/article/jamdsm/14/4/14_2020jamdsm0059/_pdf/-char/encvd diamond coated toolpulse laser grindingfemtosecond lasertool edge sharpeningsurface microstructure change |
| spellingShingle | Xiaoxu LIU Kohei NATSUME Satoru MAEGAWA Fumihiro ITOIGAWA Micromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laser Journal of Advanced Mechanical Design, Systems, and Manufacturing cvd diamond coated tool pulse laser grinding femtosecond laser tool edge sharpening surface microstructure change |
| title | Micromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laser |
| title_full | Micromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laser |
| title_fullStr | Micromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laser |
| title_full_unstemmed | Micromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laser |
| title_short | Micromachining of polycrystalline CVD diamond-coated cutting tool with femtosecond laser |
| title_sort | micromachining of polycrystalline cvd diamond coated cutting tool with femtosecond laser |
| topic | cvd diamond coated tool pulse laser grinding femtosecond laser tool edge sharpening surface microstructure change |
| url | https://www.jstage.jst.go.jp/article/jamdsm/14/4/14_2020jamdsm0059/_pdf/-char/en |
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