Cutting tool insert and drill bit so equipped

Details Cutting tool insert and drill bit so equipped Cutting tool insert and drill bit so equipped

2005-05-11

2010-06-08

Bagnell, David J (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

C175S428000

Reexamination Certificate

active

07730977

ABSTRACT:
A polycrystalline diamond abrasive cutting element consists generally of a layer of high grade polycrystalline diamond bonded to a cemented carbide substrate. The polycrystalline diamond layer has a working surface and an outer peripheral surface and is characterized by having an annular region or a portion thereof adjacent the peripheral surface that is lean in catalyzing material. A region adjacent the working surface is also lean in catalyzing material such that in use, as a wear scar develops, both the leading edge and the trailing edge thereof are located in a region lean in catalyzing material.

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