Accession Number : AD0284768

Title :   ELECTROSPARK MACHINING OF GAS TURBINE IMPELLERS

Corporate Author : LIBRARY OF CONGRESS WASHINGTON DC AEROSPACE TECHNOLOGY DIV

Personal Author(s) : SOSENKO, A.B.

Report Date : 07 SEP 1962

Pagination or Media Count : 1

Abstract : The possibility of manufacturing radial vaned impellers for small gas turbines and turbocompressors by electrospark machining is discussed. The relationships among main characteristics of the electrospark machining process for three heatresistant alloys are the same as those for carbon steels. The relationships are (1) dependen e of optimum current on area being machined, (2) dependence of optimum current on metal-removal rate, and (3) dependence of surface finish on optimum current. The efficiency of the new method is high. Machining of an impeller 300 mm in diameter on a type-473 machine requires only 10% of the time required for milling. The uniform allowance left for grinding reduces grinding time by one-half. Electrospark machining expands the potential of gas turbine design and improves the technical and economic characteristics of gas turbines. The method can be improved by machining several channels simultaneously, and can be used for machining other complex-shape parts. (Author)

Descriptors :   *SPARK MACHINING, EFFECTIVENESS, GAS TURBINE BLADES, HEAT RESISTANT METALS + ALLOYS, IMPELLERS, MANUFACTURING, STAINLESS STEEL, STEEL, SURFACES.

Distribution Statement : APPROVED FOR PUBLIC RELEASE