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Water spray electrical discharge drilling of WC-Co to prevent electrolytic corrosion

  • Ki Young Song
  • Do Kwan ChungEmail author
  • Min Soo Park
  • Chong Nam Chu
Article

Abstract

In this study, electrical discharge drilling (ED-drilling) with water spray for suppressing electrolytic corrosion was investigated. The water spray is composed of tap water and compressed air. In conventional ED-drilling with tap water, the machining results suffer from electrolytic corrosion resulting in poor accuracy because cobalt, which is the bonding material in WC-Co, is easily dissolved in water. The use of water spray instead of tap water prevented electrolytic corrosion around the machined holes without deterioration in the machining speed. The machining characteristics such as corrosion prevention effects, machining rate and electrode wear were investigated according to water spray conditions such as water flow rate and air flow rate. Using the water spray with air flow rate of 1500 ml/min and water flow rate of 60 ml/min, electrolytic-corrosion-free holes were successfully machined on WC-Co. The new machining method was applied to a die-making process with high accuracy and no corrosion.

Keywords

Electrical discharge drilling Tungsten carbide Electrolytic corrosion EDM 

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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Ki Young Song
    • 1
  • Do Kwan Chung
    • 2
    Email author
  • Min Soo Park
    • 3
  • Chong Nam Chu
    • 1
  1. 1.School of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulKorea
  2. 2.School of Robot and Automation EngineeringDongyang Mirae UniversitySeoulKorea
  3. 3.Dept. of Mechanical System Design Eng.Seoul National University of Science and TechnologySeoulKorea

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