ROLLER CUTTER OF DRILLING BIT Russian patent published in 2002 - IPC

FIELD: roller-cutting drilling bits, mainly, with teeth cutting structure. SUBSTANCE: roller cutter has a body with reversed cone and rows of main and additional calibrating teeth provided with cutting head. Cutting head of each additional tooth has a forming cylindrical section with radius R of forming cylindrical section and nominal diameter D of drilling bit which are related as R(= (1.05-1.10)D/2. Making of cutting calibrating part of additional calibrating tooth in the form of cylinder with radius larger than drilling bit nominal diameter and eccentric to its axis makes it possible to considerably increase wear resistance of drilling bit diameter surface. EFFECT: increased wear resistance of drilling bit. 4 dwg