Tool life and hole surface integrity studies for hole-making of Ti6Al4V Alloy

Qing Zhao, Xuda Qin, Chunhui Ji, Yonghang Li, Dan Sun, Yan Jin

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
542 Downloads (Pure)


With a significant growth in the use of titanium alloys in the aviation manufacturing industry, the key challenge of making high-quality holes in the aircraft assembly process needs to be addressed. In this work, case studies deploying traditional drilling and helical milling technologies are carried out to investigate the tool life and hole surface integrity for hole-making of titanium alloy. Results show that the helical milling process leads to much longer tool life, generally lower hole surface roughness, and higher hole subsurface microhardness. In addition, no plastically deformed layer or white layer has been observed in holes produced by helical milling. In contrast, a slightly softened region was always present on the drilled surface. The residual stress distributions within the hole surface, including compressive and tensile residual stress, have also been investigated in detail.
Original languageEnglish
Pages (from-to)1017-1026
Number of pages10
JournalInternational Journal of Advanced Manufacturing Technology
Issue number5-8
Early online date24 Feb 2015
Publication statusPublished - Jul 2015


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