Study on laser-induced oxidation modification coupled with micro milling of WC-Co cemented carbide
| Autor: | Liang Li, Pengcheng Mao, Yanan Du, Ning He, Guolong Zhao, Hongjun Xia |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Oxide 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Abrasion (geology) chemistry.chemical_compound Machining chemistry 0103 physical sciences Service life Materials Chemistry Ceramics and Composites Surface roughness Cemented carbide Laser power scaling Tool wear Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 46:9554-9566 |
| ISSN: | 0272-8842 |
| Popis: | Cemented carbide is known as “industrial tooth” and has wide applications in terms of military, aerospace and other fields. In this study, a compound processing approach named laser-induced oxidation modification coupled with micro milling (LCMM) is proposed to solve its poor micro machining performance. The oxidation mechanism of WC-Co cemented carbide is revealed. Surface morphology and cross-section of WC-Co cemented carbide are investigated after laser irradiation under various average laser power and two reaction environment. Research results present that at the average power of 5 W, scanning speed of 0.5 mm/s and oxygen-rich oxygen condition, the laser-induced oxidation process is optimal. The thickness of oxide layer and sub-layer is 9.1 μm and 2.7 μm, and the material surface generates porous and loose oxide layer. In addition, comparative analyses are performed and discussed in detail considering milling force, tool wear and surface quality of machined micro slot. In comparison with conventional micro milling (CONM), cutting force of Fx and thrust force of Fy generated in removing the oxide layer in LCMM are reduced by 56% and 58% to maximum extent, respectively. The machined surface quality in LCMM is better than that in CONM with a slower rate of increase in surface roughness (Sa). At ap = 2 μm and fz = 1.5 μm/z, surface quality of machined micro slot in LCMM is superior to that at other milling parameters, and the surface roughness reach 57 nm. Tool wear rate in LCMM is greatly improved and tool wear mechanism mainly includes slight adhesion wear and abrasion wear. While, in CONM the wear mechanisms are severe abrasion wear, chipping and adhesion wear. The tool service life in LCMM can be promoted more than double. |
| Databáze: | OpenAIRE |
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