MANUFACTURING METHOD OF ATTACHMENT OF CUTTERS TO HOUSING OF DRILL CROWNS Russian patent published in 2014 - IPC E21B10/00 

FIELD: oil and gas industry.

SUBSTANCE: essence of the invention consists in manufacture of a slotted joint by enclosing a shank of cutters with enveloping and inner rings. Inner rings are installed into opposite cavities on the crown housing by their being squeezed into radial slots of the crown housing. With that, material is extruded from under the end face of puncheons with forcing of the shank of cutters by the extruded mass down to the trailing wall of the radial slot. As a result, the cutter shank turns out to be rigidly fixed in the crown housing, thus forming press fit.

EFFECT: reduction of stresses in drilling cutters of annular crowns; improving sinking on a drill crown or load on the crown so that it can drill harder rocks.

4 cl, 6 dwg