| 摘要 |
FIELD: oil-and-gas production. ^ SUBSTANCE: invention related to rock cutting tools, particularly to diamond bit. The boring bit consists of case with central canal for solution supply, blades made of metal matrix, reinforced with abrasive particles, separated with opened radial canals. At that boring bit equipped at least with one bridge, located transversally at least to one of the radial canal for boring solution between two mentioned above blades and case and front cutting surface. Also mentioned above bridge, executed as an element, which does not interfere with boring solution, passes by the mentioned above canal. ^ EFFECT: bit operating lifetime increase. ^ 9 cl, 3 dwg |
