Accession Number : AD0655049

Title :   ELECTROLYTIC MACHINING OF HIGH-HARDNESS MATERIALS,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Artamonov,A. Ya.

Report Date : OCT 1960

Pagination or Media Count : 15

Abstract : An experimental model of the electrolytic slotting machine was developed and tested. Operation of the equipment consists in polishing the surface of the article by means of the current and the rotating electrode tool until the required finish is obtained. This process proceeds more rapidly if an abrasive wheel is used instead of the metal electrode tool. Ordinary abrasive wheels are unsuitable for this purpose, since they have a high electric resistance. Therefore, the method adopted for building electrically conductive abrasive electrode tools provides for compacting a powder mixture preheated to 120 - 140C. The mixture consists of 100 parts by weight of boron carbide powder of 100 mesh, 100 parts of silver-bearing flake graphite, 45 parts of bakelite, and 10 parts of plaster of Paris. The abrasive component is the boron carbide, the graphite provides the required electric conductivity, and the bakelite is the binder, while the plaster of Paris increases the hardness of the compact mass to M3 per GOST 3151-47. By means of finish-polishing with electrically conducting abrasive tools, a finish of class 14 per GOST 2789-51 can be obtained, as shown by experiments. This feature was utilized in the preparation of polished sections from high-hardness materials. The polished sections so prepared need no further machining. This method of preparing polished sections, in contrast to their preparation by machining, permits a determination of the actual distribution of the hard constituent materials, since the carbide grains of the polished section are not detached from the binder and are not clouded by it. (Author)

Descriptors :   (*ELECTROEROSIVE MACHINING, PRECISION FINISHING), MATERIALS, HARDNESS, MACHINE TOOLS, USSR, GRINDING WHEELS, COMPACTING

Subject Categories : Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE