DRILL CUTTER, DRILL CUTTER BODY AND DRILL CUTTER CARBIDE PLATE Russian patent published in 2023 - IPC E21B10/43 E21B10/58 

FIELD: drill cutters.

SUBSTANCE: group of inventions is related to a drill cutter, a drill cutter body and a carbide drill cutter plate. The drill cutter includes a body and carbide plates, the body consists of a cutting part, a clamping part and a locking part, and carbide plates are attached to the cutting part blades. The blades of the cutting part are equipped with platforms relative to the longitudinal axis of the cutter, which are made congruent to the corresponding carbide plate, and the locking part is the male type. The body is made in form of a single piece with longitudinal open-type irrigation channels. The clamping part is included in the excavation part. The locking part with the excavation part form a ledge. On the blades of the cutting part there are platforms, on each of which a carbide plate is placed. In the platform, two straight walls connected by a fillet are made in form of a stop for the plate and are oriented relative to the inflection point in a V-shape. Each platform is made in form of a centring cavity with straight walls, conjugate with a radius at the inflection point at the same radius as the plate and an angle identical to the plate. The inflection point on the pad is shifted to the outer surface of the pad in such a way that the distance from the inner surface of the plate to the inflection point is constant for all standard sizes of plates, and the outer surface of each plate is shifted to the outer surface of the cutter from its central axis by an amount depending on the standard size of the plate, and the apex of the cutter's point of impact into the rock is displaced in continuation of the rear surface of the corresponding blade.

EFFECT: possibility of quickly replacing carbide inserts on the body of a unified cutter.

27 cl, 19 dwg