• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2026, Vol. 62 ›› Issue (13): 386-398.doi: 10.3901/JME.260702

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The Influence of Tool Structure on Surface Integrity and Fatigue Life in Ultrasonic Peening Drilling Titanium Holes

SUN Zhefei1,2, ZHANG Deyuan1,2, GENG Daxi1,2, MENG Fanxing1,2, JIANG Xinggang1,2   

  1. 1. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191;
    2. Institute of Bionic and Micro-Nano Systems, Beihang University, Beijing 100191
  • Received:2025-06-02 Revised:2025-12-23 Published:2026-08-28

Abstract: In the need of high-quality holes, a kinematic theoretical model of ultrasonic peening drilling (UPD) is established, revealing the mechanism of transverse ultrasonic vibration in improving surface quality. The influence of the tool structure on hole strengthening is studied. The results indicate that increasing the chamfer angle, reducing the relief angle, and increasing the blunt radius of the cutting edge can effectively increase the residual compressive stress, whether it is the main cutting edge or the smoothed edge of the reamer. Compared with ordinary cutting tool in CD, the optimized six-tooth multi-factor blunt reamer in UPD can increase surface microhardness by 22.6% to 26.2%, residual compressive stress by 114.24% to 164.58%, plastic deformation layer thickness by 3.7 times and fatigue life by 156.18%. The fatigue source shifts from the chamfer area of the hole surface to the hole subsurface. Therefore, the combination of UPD method and tool structure optimization can simultaneously achieve precision machining and deep strengthening, providing a new principle for integrated precision and strengthening hole-making of aircraft.

Key words: tool structure, transverse elliptical ultrasonic vibration, surface quality, strengthening effect, fatigue life

CLC Number: