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  4. High-Performance Electro-Discharge Drilling with a Novel Type of Oxidized Tool Electrode
 
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2022
Journal Article
Title

High-Performance Electro-Discharge Drilling with a Novel Type of Oxidized Tool Electrode

Abstract
Electro-discharge drilling is a key technology for manufacturing sophisticated nozzles in a broad range of automotive and aerospace applications. The formation of debris in the working gap leads to arcs and short circuits on the lateral surface when state-of-the-art tool electrodes are used. As a result, limited drilling depth, increased linear tool wear, and the conicity of boreholes are still challenges. In this work, a new approach for the passivation of the lateral surface of copper tool electrodes by oxidation is shown. The comparison with state-of-the-art tool electrodes showed a reduction in the erosion duration by 48% for machining hardened steel. Promising improvements could be achieved by the thermal oxidation of the tool electrodes with the aim of increasing the electrical resistivity of the lateral surface of the tool electrode. However, due to the loss of strength, the high oxide layer thickness, and the partial delamination of the oxide layer, further comprehensive investigations on the influence of the oxidation temperature need to be conducted. Future adjustments with lower oxidation temperatures will be carried out.
Author(s)
Uhlmann, Eckart  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Polte, Julian  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Streckenbach, Jan  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Dinh, Ngoc Chuong
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Yabroudi, Sami
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Polte, Mitchel  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Börnstein, Julian  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Journal
Journal of manufacturing and materials processing  
Open Access
DOI
10.3390/jmmp6050113
Additional link
Full text
Language
English
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Keyword(s)
  • electrical discharge machining

  • oxidation

  • surface treatment

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