B - Operations – Transporting – 21 – K
Patent
B - Operations, Transporting
21
K
B21K 5/12 (2006.01) B23P 13/02 (2006.01) B23P 15/28 (2006.01) E21B 10/56 (2006.01)
Patent
CA 2135154
MATRIX DIAMOND DRAG BIT WITH PCD CYLINDRICAL CUTTERS Abstract of the Disclosure 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 the multiple cutter pockets in the mold is formed by two ball mill cuts. The first 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. The second end mill is only slightly larger than the first end mill to minimize the size of the insert securing fillet subsequently formed, thus assuring that the fillet will not interfere with the depth of penetration of each of the PCD cutters.
Oyen Wiggs Green & Mutala Llp
Smith International Inc.
LandOfFree
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