| 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],50(6):317-326 |
| Fabrication of High Aspect Ratio Feature on TA19 Titanium Alloy with Laser-induced Oxidation Assisted Micro-milling |
| Received:July 31, 2020 Revised:September 11, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.06.036 |
| KeyWord:TA19 titanium alloy laser induced oxidation micro milling material modification milling force high aspect ratio feature |
| Author | Institution |
| ZHAO Guo-long |
College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| MAO Peng-cheng |
College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| DU Ya-nan |
College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| LI Liang |
College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| HE Ning |
College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| 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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