Anomalous influence of polarity in sink EDM of titanium alloys |
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| Authors: | Maximilian Holsten Philip Koshy Andreas Klink Alexander Schwedt |
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| Affiliation: | 1. Laboratory for Machine Tools and Production Engineering, RWTH Aachen University, Germany;2. Department of Mechanical Engineering, McMaster University, Canada;3. Central Facility for Electron Microscopy, RWTH Aachen University, Germany |
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| Abstract: | An anodic tool polarity is generally adopted in sink electrical discharge machining (EDM) to maximize material removal relative to tool wear. Sink EDM of Ti and Ti6Al4V is however atypical in that these materials necessitate a cathodic tool polarity. Adding to the intrigue is γ-TiAl, which machines better under the conventional anodic polarity. This research focused on clarifying the phenomena behind this interesting behavior by investigating removal mechanisms over a range of relevant process conditions. The anomaly is demonstrated to arise from the polarity-dependent nature and extent of TiC formation on the work surface, which significantly affects material removal. |
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| Keywords: | Electrical discharge machining (EDM) Titanium Polarity |
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