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

doi:10.3901/JME.260702

Abstract

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:

V261

SUN Zhefei, ZHANG Deyuan, GENG Daxi, MENG Fanxing, JIANG Xinggang. The Influence of Tool Structure on Surface Integrity and Fatigue Life in Ultrasonic Peening Drilling Titanium Holes[J]. Journal of Mechanical Engineering, 2026, 62(13): 386-398.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260702

http://www.cjmenet.com.cn/EN/Y2026/V62/I13/386

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