| SU Yong-sheng,LI Liang,ZHONG Xiang-qiang.Machining Performance of Ultrasonic Assisted Milling of Titanium Alloy Fabricated by Laser Selective Melting[J],51(10):321-327 |
| Machining Performance of Ultrasonic Assisted Milling of Titanium Alloy Fabricated by Laser Selective Melting |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.10.034 |
| KeyWord:laser-selective melting titanium alloy polycrystalline diamond tools ultrasonic vibration assisted milling surface quality chip adhesion |
| Author | Institution |
| SU Yong-sheng |
School of Mechanical Engineering, Anhui Polytechnic University, Anhui Wuhu , China |
| LI Liang |
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics &Astronautics, Nanjing , China |
| ZHONG Xiang-qiang |
School of Mechanical Engineering, Anhui Polytechnic University, Anhui Wuhu , China |
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| Abstract: |
| The work aims to study performance and mechanism of action of ultrasonic vibration assisted milling of laser-selective melting titanium alloy, to improve the surface machining quality, machining accuracy and machining efficiency of additive manufacturing titanium alloy, and to promote the extensive application of additive manufacturing titanium alloy components in high-end equipment industry. Methods of conventional milling and ultrasonic vibration assisted milling were employed in milling of laser-selective melting titanium alloy by using polycrystalline diamond tools, and the differences of surface hardness, cutting force, surface morphology, surface roughness and chip adhesion were analyzed under different conditions. The surface hardness of laser-selective melting titanium alloy is higher than that of conventional titanium alloy by single measurement value and its average value. During the process of dry milling of the laser-selective melting titanium alloy using conventional milling way, the cutting forces decreased with the increase of rotational speed, and they increased with the increase of feed speed and cutting depth. Under the condition of conventional milling, there were some obvious tool scratches on the surface morphology of the conventional titanium alloy. However, more smooth and flat surface morphology of laser-selective melting titanium alloy were successfully achieved under the method of ultrasonic vibration assisted milling. In addition, it was found that there were serious chip adhesion on the surface of rake face and flank face using the conventional titanium alloy or the ultrasonic vibration assisted milling. Cutting forces can be reduced by the methods of increasing rotation speed, decreasing feed speed and cutting depth in conventional dry milling of the laser-selective melting titanium alloy. In addition, the experiments indicate that the machining quality of the laser-selective melting titanium alloy using ultrasonic vibration assisted milling is is better than that of the conventional titanium alloy. Compared with the machined quality of conventional milling of the conventional titanium alloy, the better surface quality of the laser-selective melting titanium alloy can be obtained by using the ultrasonic vibration assisted milling under the same cutting parameters. The action mechanism in improving surface quality of laser-selective melting titanium alloy is mainly attributed to several aspects. On one hand, the fine microstructure and higher hardness of laser-selective melting titanium alloy leads to its higher brittleness and lower plastic flow. On the other hand, compared with conventional milling way, the discontinuous cutting characteristics of ultrasonic vibration machining, which can contribute to increasing the tool-workpiece separation time and decreasing the actual cutting time, thus further improving chip breaking, reducing cutting friction of tool-workpiece or tool-chip and surface roughness of machined workpiece. The results demonstrates that the ultrasound-assisted milling has hardly effect in improving the chip adhesion on the tool surface. This may be caused by a combination of factors including the characteristics of strong adhesion and plastic fluidity of the laser-selective melting titanium alloy, the low friction coefficient of polycrystalline diamond cutter and the small brittleness difference between the laser-selective melting titanium alloy and the traditional titanium alloy. |
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