Improving Micro-EDM Machining Efficiency for Titanium Alloy Fabrication with Advanced Coated Electrodes.

Area of Science:

• Materials Science
• Manufacturing Engineering
• Surface Engineering

Background:

• Electrical Discharge Machining (EDM) is vital for precision engineering.
• Micro-EDM (µ-EDM) requires advanced techniques for optimal performance.
• Coated electrodes are a promising approach to overcome current µ-EDM limitations.

Purpose of the Study:

• To investigate the impact of different coating materials on WC electrodes in µ-EDM.
• To evaluate the performance of AlCrN, TiN, and Carbon coatings on WC electrodes for machining Ti-6Al-4V.
• To assess the effect of coated electrodes on key quality indicators: depth of cut (Z), tool wear rate (TWR), overcut (OVC), and surface quality.

Main Methods:

• Utilized micro-EDM processes with WC electrodes coated with AlCrN, TiN, and Carbon.
• Machined Titanium alloy Ti-6Al-4V using coated and uncoated electrodes.
• Quantitatively assessed depth of cut (Z), tool wear rate (TWR), overcut (OVC), and post-machining surface quality.

Main Results:

• Coated electrodes demonstrated substantial improvements in µ-EDM quality parameters compared to uncoated electrodes.
• Significant enhancements observed in increased Z, reduced TWR and OVC, and improved surface finish.
• AlCrN-coated electrodes yielded the highest Z, lowest TWR, and best OVC performance among all tested coatings.

Conclusions:

• Coated electrodes, particularly AlCrN, effectively enhance micro-EDM performance for Ti-6Al-4V.
• This approach represents a significant advancement in precision machining of titanium alloys.
• The findings provide valuable insights for optimizing µ-EDM processes through advanced electrode coatings.