METHOD FOR PRODUCING BLANK OF SHOCK RESISTANT CUTTING TIP ON BASE OF CUBIC BORON NITRIDE AND SHOCK RESISTANT CUTTING TIP PRODUCED BY SUCH METHOD Russian patent published in 2006 - IPC B22F3/14 C04B35/58 B23P15/28 

FIELD: powder metallurgy, namely production of article of super-hard materials on base of cubic boron nitride, possibly rough working and shock turning of chilled steels, rough working of cast irons, cutting tools, namely cutting inserts, milling cutters, drills.

SUBSTANCE: method comprises steps of activating and chemically copper plating powder of cubic boron nitride with fraction size no more than 10 micrometers; then mechanically mixing copper coated powder of cubic boron nitride and titanium powder with fraction size no more than 10 micrometers; subjecting prepared mixture to thermal vacuum treatment according to schedule: soaking at temperature 650 - 980°C and evacuation degree 1 x 10^-5 - 5 x 10^-5 Hg mm; soaking at 250 - 350°C and evacuation degree 300 -400 Hg mm; soaking at 700 - 900°C and evacuation degree 1 x 10 ^-5 - 5 x 10 ^-5 Hg mm; cooling mixture; increasing pressure till atmospheric one and mechanically mixing prepared mixture with aluminum powder. Prepared charge is placed in container and subjected to hot extrusion at 1100 - 1300°C and 3.5 -4.0 GPa for producing compacted product. Then temperature and pressure are lowered. In second variant of invention before thermal vacuum treatment one of alloys Mo -Al, V - Al, Ni - Al is introduced into mixture and hot extrusion is performed at 1100 - 1300°C or 5.0 - 5.5 GPa.

EFFECT: increased shock resistance, improved quality of cutting edge, enhanced cutting properties of tip.

7 cl, 1 tbl, 4 ex