FIELD: mining industry: drilling equipment. SUBSTANCE: this is intended for blast-hole drilling. Drilling bit has body with internal space, working surface of cylindrical-spherical inserts and system of blow-through holes. Tops of peripheral inserts are located along lines which are described by Gaussian curves which are symmetrical to each other, and their parameter is selected as being larger than or equal to unit. This allows for drilling blast-holes of not round in cross-section with concentrators of stresses at preset points. EFFECT: high efficiency. 3 dwg
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