A Controllable High-precision High-speed Ultrasonic Peening Method for Hole Chamfer and the Analysis of Surface Integrity

doi:10.3901/JME.260257

Abstract

Abstract: As a common stress concentration detail in the aircraft structure, the chamfer of bearing hole is prone to fatigue cracks when subjected to complex alternating loads, affecting the service life of the aircraft. Because of its small size and tilt angle, the hole chamfer is difficult to strengthen with conventional methods, and usually accompanied with low machining precision. A high- precision high-speed ultrasonic peening access is adopted for improving the surface performance of hole chamfer. The kinematics for hole chamfer ultrasonic peening machining through theoretical model is developed to study the surface generation mechanism of the machining process. Moreover, the effects of preload depth, spindle speed, strengthening time on surface integrity are analyzed. The best machining parameters are chosen for 45 steel hole chamfer. It was found that the high-speed ultrasonic peening process can efficiently reduce the surface roughness of the chamfer surface, form hardened layer in the subsurface, and introduce compressive residual stress at the same time. The results prove that the high-speed ultrasonic peening method can be applied on the hole chamfer for its considerable improvement on surface integrity.

Key words: ultrasonic strengthening, hole machining, high-speed machining, hole chamfer, surface integrity

CLC Number:

TG156

BAI Zhaoruo, HUANG Kanghua, TANG Mingjun, FENG Shulong, FENG Feng, ZHANG Jianfu, FENG Pingfa, ZHANG Xiangyu. A Controllable High-precision High-speed Ultrasonic Peening Method for Hole Chamfer and the Analysis of Surface Integrity[J]. Journal of Mechanical Engineering, 2026, 62(5): 434-442.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260257

http://www.cjmenet.com.cn/EN/Y2026/V62/I5/434

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