Accession Number : AD0285337

Title :   ELECTROSPARK MACHINING OF COMPLEX-SHAPE PARTS

Corporate Author : LIBRARY OF CONGRESS WASHINGTON DC AEROSPACE TECHNOLOGY DIV

Report Date : 18 SEP 1962

Pagination or Media Count : 1

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)

Descriptors :   *STAINLESS STEEL, *STEEL, DIES, ELECTRODES, GAS TURBINE BLADES, GRAPHITE, IMPELLERS, MACHINING, PRECISION FINISHING, SPARK MACHINING, TRANSLATIONS, TUNGSTEN.

Distribution Statement : APPROVED FOR PUBLIC RELEASE