DRILL CROWN

摘要

A drill crown has a body and a diamond-bearing matrix fixed on it, this is divided by washing slots to sectors reinforced with rock-destructive elements ad wear-proofed cylindrical inserts made of synthetic diamonds placed in central, downhole and core-forming section of the sectors by cover scheme. Hardness of central section of each of rock-destructive elements is 3.5÷3.9 times higher and hardness of peripheral section is 1.1÷1.3 times higher than hardness of the matrix material.