Accession Number:

AD0256035

Title:

MACHINING OF REFRACTORY MATERIALS

Descriptive Note:

Corporate Author:

METCUT RESEARCH ASSOCIATES INC CINCINNATI OHIO

Personal Author(s):

Report Date:

1961-05-01

Pagination or Media Count:

1.0

Abstract:

Machining studies were performed on Rene 41 solution treated to 321 BHN, Rene 41 aged to 365 BHN and D6AC steel quenched and tempered to 56 and 58 Rockwell-CRc. In drilling the Rene 41 alloy in both the solution treated and the aged conditions 50 to 60 holes could be drilled with a 14-in.-diam high speed steel drill at a cutting speed of 15 fpm, a feed of .002 in.revolution, with a highly chlorinated oil as a cutting fluid. A carbide evaluation in turning D6AC steel at 56 Rc shows that the best tool life obtained was with a C-8 type of carbide. Tool life for this carbide was over 50 min at a cutting speed of 95 fpm, a feed of .005 in.min and a depth of cut of .062 inches. The effect of cutting speed and feed on drill life in drilling D6AC with carbide tipped drills at 56 and 58 Rc was investigated. A drill life of 50 holes was obtained on the D6AC steel at 56 Rc at a cutting speed of 115 fpm and a feed of .001 in.revolution. At the higher hardness of 58 Rc, a drill life of 30 holes was obtained at a cutting speed of 85 fpm and a feed of .0005 in.revolution. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE