State-Of-Art, Challenges, and Outlook on Manufacturing of Cooling Holes for Turbine Blades

Z. Y. Li, X. T. Wei, Y. B. Guo, M. P. Sealy

Research output: Contribution to journalReview articlepeer-review

44 Scopus citations


A cooling hole is important structure of turbine blades for high-performance aircraft engines. It is very challenging to manufacture cooling holes in superalloys including nickel-based and titanium alloys. This article aims to provide a critical assessment on the major types of machining processes for manufacturing cooling holes. The process mechanism, efficiency, form accuracy, and surface integrity of the state-of-art of four machining processes, i.e., mechanical drilling (MD), electrical discharge drilling (EDD), laser drilling (LD), and electrochemical drilling (ECD) have been thoroughly analyzed and compared in details. The future challenges and future potential research directions for the machining processes are also discussed.

Original languageEnglish (US)
Pages (from-to)361-399
Number of pages39
JournalMachining Science and Technology
Issue number3
StatePublished - Jul 3 2015
Externally publishedYes


  • ECM
  • EDM
  • cooling hole
  • laser drilling
  • surface integrity
  • turbine blade

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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