刘奇,董光能.纳秒脉冲激光参数及激光路径填充方式对表面织构平坦化的影响[J].表面技术,2019,48(8):23-28.
LIU Qi,DONG Guang-neng.Effect of Nanosecond Pulsed Laser Parameters and Texture Machining Methods on Surface Texture Flattening[J].Surface Technology,2019,48(8):23-28 |
| 纳秒脉冲激光参数及激光路径填充方式对表面织构平坦化的影响 |
| Effect of Nanosecond Pulsed Laser Parameters and Texture Machining Methods on Surface Texture Flattening |
| 投稿时间：2019-06-03 修订日期：2019-08-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.004 |
| 中文关键词: 纳秒脉冲激光器 织构毛刺 织构平坦化 水膜 |
| 英文关键词:nanosecond pulsed laser texture burr surface texture flattening water film |
| 基金项目:刘奇（1994—），男，博士，主要研究方向为表面织构加工。 |
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| 中文摘要: |
| 目的 减少光纤脉冲激光器制备表面织构产生的毛刺，提高织构制备的质量。方法 利用纳秒激光器在CoCrMo盘加工表面织构时，织构周围会出现随着激光功率增加而升高的毛刺，通过保持激光平均功率不变，增大激光频率的方法来减小织构周围毛刺的高度，并且在材料表面覆盖一层水膜，来进一步减小织构周围毛刺，实现表面织构平坦化，制备出可以直接使用无需二次抛光的表面织构。在此基础上，增加织构加工的次数，在4 mm厚的水膜下打标出一组深度为50 μm左右、毛刺高度小于2 μm的表面织构，并且在25.434 N载荷下，采用销-盘摩擦方式，改变摩擦副的相对运动速度，对其进行摩擦磨损实验研究。 结果 当相对运动速度为30 mm/s时，摩擦系数最小，为0.067 67，远远小于直接加工表面织构的摩擦系数，比原始盘表面降低了23.1%。结论 增大脉冲激光的频率和覆盖水膜制备法可以减小制备织构的毛刺高度，使用覆盖水膜制备法时，多次加工制备大深度织构，毛刺高度始终保持在2 μm，没有明显变化。 |
| 英文摘要: |
| 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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