赵国龙,冒鹏程,杜亚男,李亮,何宁.激光诱导氧化辅助微细铣削TA19钛合金高深宽比微结构的研究[J].表面技术,2021,50(6):317-326.
ZHAO Guo-long,MAO Peng-cheng,DU Ya-nan,LI Liang,HE Ning.Fabrication of High Aspect Ratio Feature on TA19 Titanium Alloy with Laser-induced Oxidation Assisted Micro-milling[J].Surface Technology,2021,50(6):317-326
激光诱导氧化辅助微细铣削TA19钛合金高深宽比微结构的研究
Fabrication of High Aspect Ratio Feature on TA19 Titanium Alloy with Laser-induced Oxidation Assisted Micro-milling
投稿时间:2020-07-31  修订日期:2020-09-11
DOI:10.16490/j.cnki.issn.1001-3660.2021.06.036
中文关键词:  TA19钛合金  激光诱导氧化  微细铣削  材料改性  铣削力  高深宽比结构
英文关键词:TA19 titanium alloy  laser induced oxidation  micro milling  material modification  milling force  high aspect ratio feature
基金项目:国家自然科学基金(51705249, 52075255);中央高校基本科研业务费专项资金(NT2021020);中国博士后科学基金(2019M661823)
作者单位
赵国龙 南京航空航天大学 机电学院,南京 210016 
冒鹏程 南京航空航天大学 机电学院,南京 210016 
杜亚男 南京航空航天大学 机电学院,南京 210016 
李亮 南京航空航天大学 机电学院,南京 210016 
何宁 南京航空航天大学 机电学院,南京 210016 
AuthorInstitution
ZHAO Guo-long College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 
MAO Peng-cheng College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 
DU Ya-nan College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 
LI Liang College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 
HE Ning College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 
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中文摘要:
      目的 提高TA19钛合金的微切削加工性。方法 提出一种激光诱导氧化辅助微细铣削的复合加工方法。该方法使用较小功率的纳秒脉冲激光辐照钛合金表面,诱导材料在富氧氛围下产生氧化反应,生成疏松且易于铣削去除的氧化层。随后使用微铣刀快速去除氧化层,可提高加工效率和刀具寿命。通过激光诱导氧化试验和微细铣削试验,选择最优的激光参数和铣削参数。在最优参数下,加工宽度为0.5 mm、深宽比为3的微结构。为了验证复合加工方法的高效性,在相同的铣削参数下,与常规微细铣削工艺作对比研究。结果 激光平均功率与激光扫描速度均会对氧化效果有影响。激光平均功率为4 W、扫描速度为1 mm/s时,TA19钛合金的氧化效果较好,此时生成的氧化层疏松多孔,氧化层和亚表层的厚度分别为32 μm和9 μm。随每齿进给量的增加,铣削力逐渐增加,而背吃刀量对铣削力的影响较小,选取铣削参数n=20 000 r/min、fz=1.75 µm/z、ap=6 µm为较优参数。与常规微细铣削工艺相比,激光诱导氧化辅助微细铣削的切削力降低了38%,且加工的高深宽比微结构的毛刺较小,表面质量较高。结论 激光诱导氧化辅助微细铣削的复合加工工艺可以有效改善TA19钛合金的微切削加工性,提高刀具的使用寿命。
英文摘要:
      In order to improve the machinability of TA19 titanium alloy, a novel method of laser-induced oxidation assisted micro milling was proposed. The titanium alloy surface was irradiated by nanosecond pulsed laser with low power, and assisted with oxygen supply to induce the oxidation reaction. A porous oxide layer, which is easy to be removed, was produced. The oxide layer was quickly removed by micro end mill later, so as to reduce tool wear and improve machining efficiency. Through laser induced oxidation experiment and micro milling experiment, the optimal laser parameters and milling parameters were selected. Under the optimal parameters, a micro groove with a width of 0.5 mm and aspect ratio of 3 was fabricated. In order to verify the efficiency of this hybrid machining process, a same groove was machined with conventional micro milling based on the same milling parameters for comparison. The experimental results showed that the average laser power and laser scanning speed both affect the oxidation. The optimal oxidation parameters were 4 W (laser power) and 1 mm/s (scanning speed). Under these parameters, TA19 titanium alloy had a better oxidation effect, and the oxide layer was loose and porous. The thickness of the layer and the sub-layer were 32 μm and 9 μm, respectively. With the increase of feed per tooth, the milling force increased gradually, while the depth of back engagement had little effect on the milling force. The optimal parameters are n=20 000 r/min, ap=6 µm,fz=1.75 µm/z. Compared with the conventional micro-milling process, the laser-induced oxidation assisted micro-milling process reduced the milling force by 38%, and the high aspect ratio microgroove had smaller burrs and better surface quality. The results showed that the laser-induced oxidation assisted micro milling process can effectively improve the machinability of TA19 titanium alloy and prolong the tool life.
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