ELECTROSPARK MACHINING OF COMPLEX-SHAPE PARTS

Abstract

The Kaluga Turbine Plant makes extensive use of electrospark machining in the manufacture of dies and gas turbine blades made from EI-612K steel and turbine impellers made from EI-661 steel. Dimensional precision of 0.2 mm and Class 3 surface finish (roughness height, 40 to 63 microns) are achieved. Numerous experiments in the machining of EI-612K, EI-661 and 5XHT steels and steel 45 showed that graphite electrodes possess minimum relative wear (3 to 5%) and maximum life, output, and precision. Good results were also obtained with copper electrodes (15 to 23% wear), which re used for piercing narrow slots and cutting off and cutting out blanks from heat-resistant alloys. These copper electrodes permit machining at higher power levels and metal-removal rates. For piercing small deep holes, tungsten electrodes proved to be the best. Their relative wear is 1 to 2%. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 18, 1962
Accession Number
AD0285337

Entities

Organizations

  • Library of Congress

Tags

DTIC Thesaurus Topics

  • Alloys
  • Electrodes
  • Fabrication
  • Gas Turbine Blades
  • Gas Turbines
  • Heat Resistant Alloys
  • Impellers
  • Machining
  • Manufacturing
  • Power Levels
  • Precision
  • Rotor Blades (Turbomachinery)
  • Spark Machining
  • Turbine Blades
  • Turbines
  • Turbomachinery

Fields of Study

  • Materials science

Readers

  • Manufacturing Engineering.
  • Metallurgy
  • Surface Engineering/Surface Coating Technology.