公开(公告)号：US5213171A

公开(公告)日：1993-05-25

申请号：US764016

申请日：1991-09-23

Applicant: Mark Clench ,  Saul N. Izaguirre

Inventor： Mark Clench ,  Saul N. Izaguirre

IPC: E21B10/56 ,  E21B10/573

CPC classification number: E21B10/573

Abstract: This invention consists of a diamond drag bit having a multiplicity of cutter studs secured within strategically positioned insert holes formed by a cutter face of the drag bit body. Means are provided to support the portion of the cutting end of each of the extended insert studs protruding above the bit face.

公开(公告)号：US5056382A

公开(公告)日：1991-10-15

申请号：US630682

申请日：1990-12-20

Applicant: Mark Clench

Inventor： Mark Clench

IPC: B23P13/02 ,  B23P15/28 ,  E21B10/56 ,  E21B10/567

CPC classification number: E21B10/567 ,  B23P13/02 ,  B23P15/28 ,  Y10S76/12

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