ROLLING DRILLING BIT Russian patent published in 2017 - IPC E21B10/20 E21B10/50 

FIELD: mining.

SUBSTANCE: rolling drilling bit contains a body with an inclined pin, the blade, which is continuation of the ground removing screw, and cutter with crowns of arms, made in the form of a truncated sphere, on the cut surface of which the ring trough is made, the cross section of which is closed by the lower end of the blade, repeating the trough profile, and forming the sharp angle with the cut surface of the sphere. The bit blade is made as a spiral turn, reinforced at the body with the angular inclination to the horizontal less, than the granular materials slope of repose. The cutter is made composite and includes a sealed hub with the rim, made in the form of a solid disc with a spherical diametric surface and the ring trough, located on the front side of the disc, and the removable band, formed as a hollow truncated sphere, mounted coaxially on the hub on the reverse side of the rim, so that, the spherical surfaces of the rim and band have a common center and, together form a hemisphere of the cutter. The spherical surfaces of the rim and band are equipped with crowns of arms in the form of hard-alloy bits, and the edge of the rim, the lower end and the blade spiral edge is covered with the hard wear resistant material.

EFFECT: increase of arms durability, operating life and productivity of rolling drilling bit work.

5 cl, 8 dwg