Matrix diamond drag bit with PCD cylindrical cutters.

摘要

A drag bit mold fabricated from high temperature resisting material is machined to accept cylindrically shaped polycrystalline diamond (PCD) cutters having tungsten carbide bodies. Each of a multiplicity of PCD matrix pockets in the mold is formed by two independent non-parallel milling cutter passes. A first ball end mill cut defines the PCD cutter position in the cutting face of the matrix diamond drag bit. A second ball end mill cut superimposed over the first end mill pocket creates a surrounding pocket which fills with powder metallurgy matrix material to provide a raised support for the cylindrical cutter.