Percussion rock bit

Details Percussion rock bit Percussion rock bit

E - Fixed Constructions

21

B

255/84

E21B 10/52 (2006.01) B22F 7/06 (2006.01) B32B 15/01 (2006.01) E21B 10/56 (2006.01)

Patent

CA 1261317

PERCUSSION ROCK BIT Abstract of the Disclosure A percussion rock bit comprises a steel body having means for connection to a drill string at one end and having a plurality of inserts at the other end for crushing rock at the bottom of a hole being drilled. The inserts have a cemented tungsten carbide body partially embedded in the steel bit and at least two layers at the protruding drilling portion of the insert. The outermost layer contains polycrystalline diamond. The remaining layers adjacent the polycrystalline diamond layer are transition layers containing a composite of diamond crystals and precemented tungsten carbide, the composite having a higher diamond crystal content adjacent the polycrystalline diamond layer and a higher precemented tungsten carbide content adjacent the tungsten carbide layer.

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