Cutting elements for rotary drill bits
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United States of America Patent
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Apr 21, 1998
Grant Date -
N/A
app pub date -
Apr 19, 1996
filing date -
May 2, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A preform cutting element for a rotary drag-type drill bit includes a facing table of polycrystalline diamond having a rear surface bonded to a tungsten carbide substrate. The cutting element is formed with an angled chamfer to form a straight cutting edge on the facing table. The junction between one end of the cutting edge and the remainder of the peripheral surface of the facing table is chamfered in a part-circular arc to provide a smooth transition between the cutting edge and the rest of the peripheral surface. Such transition may reduce the spalling or other damage which may be caused by steady state and impact loads in this region.
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