Abstract
Longitudinal-torsional ultrasonic vibration assisted micro-milling (LUVAM) can significantly improve the machinability of TC4 titanium alloy. With the continuous improvement of machining accuracy of many micro parts in the special industry field, the surface formation mechanism of TC4 titanium alloy under LUVAM has gradually become a research hotspot, and it is necessary to develop a reliable prediction model of the three-dimensional (3D) surface morphology of the machined surface of TC4 titanium alloy. In the study, the surface formation mechanism of TC4 titanium alloy under LUVAM is explored by a probabilistic model. Firstly, the mechanism of the intermittent cutting characteristics of LUVAM is analyzed by the trajectories of the tool tip, and the instantaneous undeformed chip thickness (IUCT) of LUVAM is built to analyze the effect of ultrasonic vibration on the surface formation mechanism of TC4 titanium alloy under LUVAM. Secondly, the model of the comprehensive trajectories of the tool tip is established considering the radial runout of the cutter, the flexible deformation of the cutter and the elastic recovery of the machined surface, then a probabilistic model of the machined surface residual material height of TC4 titanium alloy under LUVAM is further established to predict the 3D surface morphology of the machined surface of TC4 titanium alloy under LUVAM. Finally, the 3D surface morphology of the machined surface of TC4 titanium alloy under LUVAM is simulated, and the experiments of LUVAM applied to TC4 titanium alloy were carried out to explore the influence of processing parameters on the surface morphology. The simulated and experimental results show the simulation results are consistent with the experimental results, which verifies the accuracy and reliability of the theoretical model. As a result, the probabilistic model of the residual surface material height of TC4 titanium alloy under LUVAM can provide the theoretical and technical reference for the surface formation mechanism of TC4 titanium alloy under LUVAM, which may further promote the development and application of TC4 titanium alloy in many micro-scale parts processing fields.
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Abbreviations
- A :
-
Ultrasonic amplitude (μm)
- E :
-
Elastic modulus of TC4 titanium alloy workpiece (GPa)
- E t :
-
Elastic modulus of the cutter (GPa)
- f :
-
Ultrasonic vibration frequency (Hz)
- f z :
-
Feed per tooth (μm/z)
- h er :
-
Height of the elastic recovery of the machined surface (μm)
- I :
-
Moment of inertia of the micro-milling cutter (mm4)
- k t :
-
Elastic recovery constant of TC4 titanium alloy
- l a :
-
Extended length of the cutter (mm)
- n :
-
Spindle speed (r/min)
- R :
-
Radius of the micro-milling cutter (mm)
- v ω :
-
Feed rate of the workpiece (mm/s)
- β :
-
Helix angle of the cutter (°)
- ω :
-
Angular velocity of the cutter (rad/s)
- φ :
-
Phase difference of the longitudinal torsional ultrasonic vibration (rad)
- к :
-
Front angle of the cutter (°)
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This research is supported by The National Natural Science Foundation of China project (Project code: 51575163) and Key R&D and Promotion Projects in Henan Province(Project code: 232102221018).
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Yan, Y., Jiang, C. & Yan, H. Probabilistic model of the surface residual height under longitudinal-torsional ultrasonic vibration assisted micro-milling TC4. Int J Adv Manuf Technol 131, 2837–2855 (2024). https://doi.org/10.1007/s00170-023-12548-x
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DOI: https://doi.org/10.1007/s00170-023-12548-x