| LIU Qi,DONG Guang-neng.Effect of Nanosecond Pulsed Laser Parameters and Texture Machining Methods on Surface Texture Flattening[J],48(8):23-28 |
| Effect of Nanosecond Pulsed Laser Parameters and Texture Machining Methods on Surface Texture Flattening |
| Received:June 03, 2019 Revised:August 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.004 |
| KeyWord:nanosecond pulsed laser texture burr surface texture flattening water film |
| Author | Institution |
| LIU Qi |
Institute of Design Science and Basic Components, Xi'an Jiaotong University, Xi'an , China |
| DONG Guang-neng |
Institute of Design Science and Basic Components, Xi'an Jiaotong University, Xi'an , China |
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| Abstract: |
| The work aims to reduce the burr of surface texture produced by pulsed fiber laser and improve the quality of texture preparation. When nanosecond laser was used to process surface texture on CoCrMo disk, burrs around the texture grew with the increase of laser power. By keeping the average laser power unchanged, laser frequency was increased to reduce the burr height around the texture. A layer of water film was covered on the surface of the material to further decrease the burrs around the texture and then flatten the surface texture. Therefore, the surface texture could be directly used without secondary polishing. Based on this method, the number of texture processing was increased to mark a group of surface textures with a depth of about 50 μm and a height of less than 2 μm under 4 mm thick water film. Under 25.434 N load, the pin-on-disk friction mode was used to carry out experiments by changing the relative motion velocity of friction pairs. When the relative motion velocity was 30 mm/s, the minimum friction coefficient was 0.067 67 which was much less than that of the directly processed surface, and 23.1% lower than that of the original disk surface. Increasing the frequency of pulsed laser and the machining method of coated water film can reduce the burr height of the texture. When the machining method of coated water film is used, the deep texture can be fabricated many times, and the burr height remains unchanged at 2 μm without any change. |
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