Rolling cutters for drill bits, and processes to produce same

Abstract From the Canadian patent

A roller bit cutter comprises: a) a tough, metallic, generally conical and fracture resistant core having a hollow interior the core defining an, axis, b) an annular metallic, radial bearing layer carried by said core at the interior thereof to support the core for rotation, said bearing layer extending about said axis c) a wear resistant outer metallic layer on the exterior of the core, d) metallic teeth integral with the core and protruding outwardly therefrom, at least some of said teeth spaced about said axis, e) and an impact and wear resistant layer on each tooth to provide hard cutting edges as the bit cutter is rotated about said axis. -1-