| 摘要 |
FIELD: mining. ^ SUBSTANCE: invention refers to rock destruction tool, particularly to bore bits with hard-alloyed equipment. The bore bit consists of a case with slots on working end and hard-alloyed cutting teeth overlapping the end of the bit; the teeth are made with a concave front facet. The feature of the bit is made in form of a rack the working end of hard-alloyed cutting teeth; projections of the teeth are of wedge shape; also height of racks increases in the direction from center to periphery. Notably, the case of the bit is made with inclined watercourses, the outlet part of which is situated before the convex facet of the hard-alloyed cutting teeth. ^ EFFECT: upgraded efficiency of bore bit operation. ^ 6 dwg, 2 cl |
