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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2300227


High efficiency ultrasonic assisted drilling of CFRP/Ti stacks under non-separation type and dry conditions


Author(s):  Enze YING, Zehua ZHOU, Daxi GENG, Zhenyu SHAO, Zhefei SUN, Yihang LIU, Lianxing LIU, Xinggang JIANG, Deyuan ZHANG

Affiliation(s):  School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China; more

Corresponding email(s):   gengdx@buaa.edu.cn

Key Words:  CFRP/Ti stacks, Ultrasonic-assisted drilling, Cutting force, Surface integrity, Tool wear


Enze YING, Zehua ZHOU, Daxi GENG, Zhenyu SHAO, Zhefei SUN, Yihang LIU, Lianxing LIU, Xinggang JIANG, Deyuan ZHANG. High efficiency ultrasonic assisted drilling of CFRP/Ti stacks under non-separation type and dry conditions[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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A1 - Lianxing LIU
A1 - Xinggang JIANG
A1 - Deyuan ZHANG
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Abstract: 
Carbon fiber reinforced plastic and titanium alloy (i.e. CFRP/Ti) stacks are widely used in the key components of aircraft fuselages and wings. However, significant differences in physical and mechanical properties between CFRP and Ti lead to issues such as poor machining quality, serious tool wear and low processing efficiency during hole-making. High-efficiency and high-quality hole-making of CFRP/Ti stacks has therefore become a significant problem in aviation manufacturing. ultrasonic-assisted drilling (UAD) involves applying a high-frequency vibration to the tool to make the conventional continuous cutting into a different type of separated cutting, so as to improve machining quality and tool life. Separation type UAD has been applied to the processing of CFRP/Ti stacks, but the separation mode limits processing efficiency. In this study, aimed to address the low efficiency for conventional UAD of CFRP/Ti stacks, feasibility experiments of non-separation UAD, in which continuous cutting between the tool and the workpiece occurs under high feed rate, are carried out. Experimental results indicate that, compared to conventional drilling (CD), average thrust force in non-separation UAD of CFRP and Ti decreased by 1.9 to 24.2% and 2.6 to 22.1%, respectively. Furthermore, non-separation UAD significantly improves hole quality, including higher hole diameter accuracy, lower hole surface roughness, and less hole damage. In addition, non-separation UAD can decrease adhesive tool wear. This study demonstrates that, compared to CD, non-separation UAD can effectively improve drilling quality and tool life while maintaining high efficiency.

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