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<p>During the micro-milling of titanium alloys, a significant amount of cutting heat may be generated due to their higher chemical reactivity and lower thermal conductivity, which leads to low machining efficiency and machining precision of high-performance parts. Under the background, the Nano-fluid Minimum Quantity Lubrication &amp; Longitudinal-Torsional Ultrasonic assisted Micro-Milling (NMQL&amp;LTUMM) was built and applied to the precise machining of titanium alloy parts, then the special machining characteristics during the NMQL&amp;LTUMM, especially the generation mechanisms of cutting heat, were studied. Firstly, the tool-workpiece contact ratio model and the heat flux density model for the cutting zone were established based on the longitudinal-torsional ultrasonic micro-milling model, then the unique machining mode was analyzed by the forced convection heat transfer mode, and the specific factors affecting the heat source in the processing area were studied. Finally, the titanium alloy NMQL&amp;LTUMM temperature field model was established and then experimental validation was carried out. Theoretical analysis and experimental results show that the tool-workpiece contact rate during the machining process is reduced due to the application of the NMQL&amp;LTUMM machining method, which results in a drop in the temperature created by shear heat and the improvement in the convective heat transfer effect caused by the NMQL, thus the micro-milling temperature in the cutting zone is considerably reduced. Additionally, as the ultrasonic amplitude increases, the cutting zone temperature is reduced by up to 24.8% on the condition that the ultrasonic amplitude is 3&#xa0;µm compared to conventional micro-milling.</p>

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Study on temperature characteristics of Ti-6Al-4 V applied in longitudinal-torsional ultrasonic micro-milling under NMQL conditions

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Yanyan Yan,
  • Yifan Zhang,
  • Caixia Jiang,
  • Yinghao Liang

摘要

During the micro-milling of titanium alloys, a significant amount of cutting heat may be generated due to their higher chemical reactivity and lower thermal conductivity, which leads to low machining efficiency and machining precision of high-performance parts. Under the background, the Nano-fluid Minimum Quantity Lubrication & Longitudinal-Torsional Ultrasonic assisted Micro-Milling (NMQL&LTUMM) was built and applied to the precise machining of titanium alloy parts, then the special machining characteristics during the NMQL&LTUMM, especially the generation mechanisms of cutting heat, were studied. Firstly, the tool-workpiece contact ratio model and the heat flux density model for the cutting zone were established based on the longitudinal-torsional ultrasonic micro-milling model, then the unique machining mode was analyzed by the forced convection heat transfer mode, and the specific factors affecting the heat source in the processing area were studied. Finally, the titanium alloy NMQL&LTUMM temperature field model was established and then experimental validation was carried out. Theoretical analysis and experimental results show that the tool-workpiece contact rate during the machining process is reduced due to the application of the NMQL&LTUMM machining method, which results in a drop in the temperature created by shear heat and the improvement in the convective heat transfer effect caused by the NMQL, thus the micro-milling temperature in the cutting zone is considerably reduced. Additionally, as the ultrasonic amplitude increases, the cutting zone temperature is reduced by up to 24.8% on the condition that the ultrasonic amplitude is 3 µm compared to conventional micro-milling.