| 摘要 |
FIELD: mining.SUBSTANCE: drill bit comprises the body with circular cavity and working die equipped with extended central cutter and lower side cutters divided into sectors by grooves with flushing channels. Said grooves are divided by webs into sections: front sludge removal section and rear sections with flushing channels. Note here that said webs are higher than groove sidewalls. Lengthwise grooves are made over the central cutter outer surface. Side cutters have through bores made at their front in drill bit direction of rotation. Note here that lengthwise grooves and through bores are hydraulically communicated with the body circular cavity.EFFECT: longer service life, higher well drilling speed.2 dwg |
