Cutter assemblies and cutting elements for rotary drill bits
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United States of America Patent
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-
Sep 20, 1994
Grant Date -
N/A
app pub date -
Oct 5, 1993
filing date -
Oct 7, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cutter assembly for a rotary drill bit comprises a preform cutting element mounted on a carrier. The cutting element includes a thin cutting table of polycrystalline diamond, defining a front cutting face and a cutting edge bonded to a less hard substrate which is in turn bonded to the carrier. The substrate and/or the carrier comprises a first portion of high erosion resistance, formed for example from tungsten carbide, and a second portion of lower erosion resistance, formed for example from tungsten metal, which is located in the vicinity of the cutting edge of the cutting element so that, in use, the wear flat is mostly formed in the material of lower erosion resistance.
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