A dual material removal mechanism for clearing of obstructed holes via electrical discharge machining

Castro-Palacios, Monica; Ahmed, Shamraze; Ahmed, Nuhaize; Murray, James W.; Speidel, Alistair; Duffin, Jason; Kell, James; Clare, Adam T.

Abstract

Cooling hole blockages in gas turbine blades can occur during operation, detrimentally reducing performance and resulting in premature removal from service. Here, electrical discharge machining (EDM) is used to unblock fine holes, which have been obstructed with a mixture of both conductive and non-conductive contaminants representative of post-service condition. This work demonstrates EDM is a viable process to unblock fine holes containing material which is partially non-conductive. The mechanism results from a combination of conventional EDM discharges and mechanical spalling, resulting in a dual removal process. This method allows accurate and repeatable hole clearance in a conventional EDM hole-drilling setup.

Citation

Castro-Palacios, M., Ahmed, S., Ahmed, N., Murray, J. W., Speidel, A., Duffin, J., Kell, J., & Clare, A. T. (2022). A dual material removal mechanism for clearing of obstructed holes via electrical discharge machining. Manufacturing Letters, 31, 10-14. https://doi.org/10.1016/j.mfglet.2021.12.003

• Journal Article Type: Article
• Acceptance Date: Dec 9, 2021
• Online Publication Date: Dec 21, 2021
• Publication Date: 2022-01
• Deposit Date: May 15, 2023
• Journal: Manufacturing Letters
• Print ISSN: 2213-8463
• Peer Reviewed: Peer Reviewed
• Volume: 31
• Pages: 10-14
• DOI: https://doi.org/10.1016/j.mfglet.2021.12.003
• Keywords: Industrial and Manufacturing Engineering; Mechanics of Materials
• Public URL: https://nottingham-repository.worktribe.com/output/18528927
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S2213846321000869?via%3Dihub