| 摘要 |
FIELD: mining. ^ SUBSTANCE: body of the modular drill bit with fixed cutting elements, comprising a blade holder, which contains the first cemented carbide with hardness from 85 to 90 hardness units by Rockwell A-scale, and at least one blade fixed in the blade holder and containing the second cemented carbide with hardness from 90 to 94 hardness units by Rockwell A-scale. Also a modular drill bit is proposed with fixed cutting elements, as well as methods to manufacture the body of the modular drill bit and the drill bit itself. ^ EFFECT: increased strength, resistance to wear and impact toughness of bodies. ^ 36 cl, 6 dwg |
