Wang Chenyu, Li Changyou, Miao Huihui, Tan Zhi, Sun Wei
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China.
School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China.
Materials (Basel). 2025 Jul 3;18(13):3160. doi: 10.3390/ma18133160.
This study discusses the surface characteristics of titanium alloy Ti6Al4V during high-speed cutting, especially the effect of cutting speed on surface quality at different measuring scales. The experimental analysis shows that when the feed rate is 0.2 mm, and the detection scale is 1.2 mm, the surface roughness increases first and then decreases with the increase in the cutting speed. When the detection scale is 0.1 mm, the surface roughness continues to increase with the increase in the cutting speed. Based on the experimental results, this study adopted a research method combining experiment and simulation to intensely discuss the difference in the cutting speed's mechanism of influence on surface quality under different detection scales. Based on the first principles, a prediction model for the oxide layer of high-speed cutting titanium alloy was constructed, and experiments verified the model's accuracy. It was found that with the increase in the cutting speed, the cutting surface layer gradually formed a metamorphic layer, and the thickness of the oxide layer gradually increased, and it resultantly fell away. At the same time, the change in material microstructure and phase transition worked together to reduce the machining accuracy. In addition, the content of different components significantly affected the formation mechanism of the oxide layer, significantly increasing the Al content, which affected the oxygen diffusion activation energy and the oxide layer's thickness.
本研究探讨了钛合金Ti6Al4V在高速切削过程中的表面特性，特别是切削速度在不同测量尺度下对表面质量的影响。实验分析表明，当进给速度为0.2mm，检测尺度为1.2mm时，表面粗糙度随切削速度的增加先增大后减小。当检测尺度为0.1mm时，表面粗糙度随切削速度的增加而持续增大。基于实验结果，本研究采用实验与模拟相结合的研究方法，深入探讨了不同检测尺度下切削速度对表面质量影响机制的差异。基于第一性原理，构建了高速切削钛合金氧化层的预测模型，并通过实验验证了模型的准确性。研究发现，随着切削速度的增加，切削表面层逐渐形成变质层，氧化层厚度逐渐增加并最终脱落。同时，材料微观结构和相变的变化共同作用降低了加工精度。此外，不同成分的含量显著影响氧化层的形成机制，显著增加Al含量会影响氧扩散激活能和氧化层厚度。
