Abstract
Carbon fiber–reinforced plastics (CFRP)/titanium alloy (Ti) stacks are extensively applied in the aerospace industry due to their excellent mechanical properties. However, their poor machinability poses great challenges. In this study, longitudinal-torsional ultrasonic vibration drilling (LT-UVD) is innovatively introduced to improve the quality of CFRP/Ti drilling. First, the separation mode of LT-UVD is analyzed by kinematic equations. Then, an experimental platform is built based on the LT-UVD vibration actuator to perform CFRP/Ti drilling experiments. The thrust force, interface temperature, hole wall quality, hole defects, Ti chip morphologies, and tool wear in LT-UVD are experimentally compared against conventional drilling (CD) and longitudinal ultrasonic vibration drilling (L-UVD). The experimental results show that, compared with CD and L-UVD, the thrust force of CFRP in LT-UVD decreases by 20.36–40.55% and 2.04–14.61%, while the thrust force of Ti decreases by 19.08–24.83% and 1.95–9.34%. Moreover, a relatively low maximum interface temperature is achieved in LT-UVD. In addition, the hole size accuracy, surface roughness for the hole’s inner surface, and delamination factor are improved in LT-UVD. Fiber pullout defects, chip-breaking performance, and tool wear of CFRP are improved due to torsional vibration in LT-UVD. Finally, according to the high-speed camera, damage forms of the interface area are different when drilling CFRP/Ti stacks with various drilling sequences.
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Data availability
The datasets generated during and/or analyzed during the current study are not publicly available, but are available from the corresponding author on reasonable request.
Code availability
The code that supports the findings of this study is available from the corresponding author upon request.
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Funding
This research was funded by the National Natural Science Foundation of China (No. 51775260, No. 52205471), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (21KJB460022), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. SJCX21_0942).
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Zhou, Z., Feng, Y., Xu, W. et al. Experimental study on longitudinal-torsional ultrasonic vibration drilling of carbon fiber–reinforced plastics/titanium alloy stacks. Int J Adv Manuf Technol 124, 527–543 (2023). https://doi.org/10.1007/s00170-022-10409-7
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DOI: https://doi.org/10.1007/s00170-022-10409-7