High-efficiency ultrasonic assisted drilling of CFRP/Ti stacks under non-separation type and dry conditions
Enze Ying, Zehua Zhou, Daxi Geng, Zhenyu Shao, Zhefei Sun, Yihang Liu, Lianxing Liu, Xinggang Jiang, Deyuan Zhang
Abstract
In this study, to address the low efficiency for conventional ultrasonic-assisted drilling (UAD) of carbon fiber-reinforced plastic and titanium alloy (CFRP/Ti) stacks, feasibility experiments of non-separation UAD, in which continuous cutting between the tool and the workpiece occurs at a high feed rate, are carried out. The experimental results indicate that, compared to conventional separation UAD, the non-separation UAD effectively reduces the cutting forces by 24.2% and 1.9% for CFRP stage and 22.1% and 2.6% for the Ti stage at the feed rates of 50 and 70 µm/r, respectively. Furthermore, the non-separation UAD significantly improves hole quality, including higher hole diameter accuracy, lower hole surface roughness, and less hole damage. In addition, the non-separation UAD can decrease adhesive tool wear. This study demonstrates that, compared to conventional drilling (CD), the non-separation UAD can effectively improve drilling quality and tool life while maintaining high efficiency.