Accession Number:

AD0285337

Title:

ELECTROSPARK MACHINING OF COMPLEX-SHAPE PARTS

Descriptive Note:

Corporate Author:

LIBRARY OF CONGRESS WASHINGTON DC AEROSPACE TECHNOLOGY DIV

Personal Author(s):

Report Date:

1962-09-18

Pagination or Media Count:

1.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE