Surface Characteristics and Residual Stress Variation in Semi-Deep Hole Machining of Ti6Al4V ELI with Low-Frequency Vibration-Assisted Drilling

Author:

Choe Joon-Hyeok1ORCID,Ha Ju Hyung2,Kim Jisoo13,Kim Dong Min2

Affiliation:

1. Department of Precision Mechanical Engineering, Kyungpook National University (KNU), Sangju-si 37224, Republic of Korea

2. Dongnam Division, Korea Institute of Industrial Technology (KITECH), Jinju-si 52845, Republic of Korea

3. Department of Advanced Science and Technology Convergence, Kyungpook National University (KNU), Sangju-si 37224, Republic of Korea

Abstract

This study examined the impact of vibration-assisted drilling (VAD) on hole quality and residual stress in Ti-6Al-4V ELI (Extra Low Interstitials) material. Ti-6Al-4V ELI possesses excellent mechanical properties but presents challenges in machining, including chip evacuation, burr formation, and elevated cutting temperatures. VAD, particularly low-frequency vibration-assisted drilling (LF-VAD), has been explored as a potential solution to address these issues. The research compares LF-VAD with conventional drilling (CD) under various cutting and cooling conditions. LF-VAD exhibits higher maximum thrust forces under specific conditions, which result in accelerated tool wear. However, it also demonstrates lower RMS (root mean square) forces compared to CD, offering better control over chip formation, reduced burr formation, and improved surface roughness within the hole. Furthermore, LF-VAD generates greater compressive residual stresses on the hole’s inner surface compared to CD, suggesting enhanced fatigue performance. These findings indicate that LF-VAD holds promise for improving the hole’s surface characteristics, fatigue life, and overall component durability in Ti-6Al-4V machining applications.

Funder

Korea Institute of Industrial Technology

National Research Foundation of Korea

Publisher

MDPI AG

Subject

Industrial and Manufacturing Engineering,Mechanical Engineering,Mechanics of Materials

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Digital Twin Platform for Machining Robotic Production System based on Cutting Force Physics Models;Journal of the Korean Society for Precision Engineering;2024-06-01

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