Influence of force load on the stability of ultrasonic longitudinal–torsional composite drilling system

  • Bo ZhaoEmail author
  • Baoqi Chang
  • Lusheng Yuan
  • Pengtao Li


This study aimed to investigate the problems of system detuning, amplitude attenuation, and even vibration stop after the load was applied to the acoustic system during ultrasonic-assisted vibration processing. In the theoretical part, the overall theoretical model of the ultrasonic longitudinal–torsional composite drilling system (ULTCDS), including the longitudinal–torsional composite horn, transducer, and load was established based on the four-terminal network, combined with the longitudinal and torsional vibration equations of the variable cross-section rod. Also, the influence of the load on the input impedance and output amplitude of the acoustic system was preliminarily analyzed. In the simulation part, the static and dynamic drilling force was simulated by the pre-stressed modal and transient dynamic analyses, and the influence of the force load on the resonant frequency and output amplitude of the system was further explored. In the experiment part, the static force loading test and the ultrasonic drilling test of titanium alloy were designed. The micro-morphology of drilling holes under different processing parameters was observed, and the influence of force load on the system characteristics and stability was explored. The results showed that when the system was subjected to a force load greater than 400 N, the system current and frequency were greatly offset, the electromechanical conversion efficiency reduced, and the amplitude was attenuated to below the amplitude at empty load. In the ultrasonic-assisted drilling of titanium alloy processing, the acoustic system undergoes an obvious detuning phenomenon and the drilling quality is attenuated when the current increased by more than 60% and the frequency changed by more than 350 Hz, affecting the stability of the system and the ultrasonic-assisted processing effect.


Ultrasonic longitudinal-torsional composite drilling Four-terminal network model Finite element simulation Force load Amplitude 


Funding information

This study was supported financially by the National Natural Science Foundation of China (Nos. 51475148 and U1604255).


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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Bo Zhao
    • 1
    Email author
  • Baoqi Chang
    • 1
  • Lusheng Yuan
    • 1
  • Pengtao Li
    • 1
  1. 1.School of Mechanical and Power EngineeringHenan Polytechnic UniversityJiaozuoChina

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