Superabrasive cutting element with enhanced stiffness, thermal conductivity and cutting efficency

摘要

A cutter for use on a rotary-type drag bit for earth boring is provided comprising a substantially rectangular diamond table attached to and supported by a substrate. A plurality of rod-like diamond pilings made of polycrystalline diamond is carried in the substrate, extending from the cutting face of the diamond table, through the diamond table, and into the substrate material. The diamond pilings are generally arranged in a mutually parallel configuration substantially transverse to the plane of the diamond table, and the forward ends of each diamond piling may coextensively terminate at the cutting face of the diamond table, may terminate within the diamond table, or may merely abut the rear of the diamond table. Further, the diamond table may be of smaller size than the transverse cross-section of the substrate, and at least a portion of the periphery of the substrate may then be forwardly and inwardly tapered to provide structural support to the diamond table.