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Industrial-Scale Copper Wear Reduction in the Electrical Discharge Machining Through Hydrostatic Extrusion.

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Hydrostatic extrusion refines copper microstructure for enhanced electrical discharge machining (EDM) electrodes. This process improves wear resistance and surface quality, crucial for industrial EDM applications.

Keywords:
application testselectro discharge machininggrain refinementhydrostatic extrusionwear analysis

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Area of Science:

  • Materials Science
  • Manufacturing Engineering

Background:

  • Electrical discharge machining (EDM) requires electrodes with high mechanical strength and electrical conductivity.
  • Pure M1E copper is a candidate material, but its performance can be limited by its microstructure.

Purpose of the Study:

  • To develop and optimize a hydrostatic extrusion (HE) process for pure M1E copper.
  • To enhance the mechanical and electrical properties of copper for improved EDM electrode performance.

Main Methods:

  • A three-stage hydrostatic extrusion process was employed to achieve a cumulative strain of 2.51.
  • Microstructural analysis was performed to characterize grain size.
  • Mechanical properties (UTS) and electrical conductivity (IACS) were measured.
  • Industrial EDM wear tests were conducted using HE-processed and undeformed copper electrodes.

Main Results:

  • The optimized HE process resulted in an ultrafine-grained structure (d ≈ 370 nm).
  • This microstructure led to increased mechanical strength (UTS ≈ 400 MPa) while maintaining high electrical conductivity (~99% IACS).
  • Electrodes processed via HE showed a 30-90% reduction in electroerosion wear and up to 25% improvement in surface quality during EDM.

Conclusions:

  • Hydrostatic extrusion is an effective method for producing high-performance EDM electrode materials.
  • The developed process enhances copper's wear resistance and machining quality without compromising electrical performance.