Bits and cutting structures
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United States of America Patent
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Jun 26, 2007
Grant Date -
Aug 19, 2004
app pub date -
Oct 29, 2003
filing date -
Feb 12, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An insert for a drill bit which includes a diamond impregnated body, and a shearing portion disposed on said body is shown. In addition, a method for forming a drill bit that includes (a) forming a shearing portion on a diamond-impregnated insert body to form a cutting insert, (b) forming a bit body having a plurality of sockets sized to receive a plurality of the cutting inserts, and (c) mounting the plurality of cutting inserts in the bit body and affixing the plurality of cutting inserts to the bit body; wherein steps (a) (c) are carried out such that a total exposure of the diamond-impregnated insert to temperatures above 1000.degree. F. is greater than a total exposure of the shearing portion to temperatures above 1000.degree. F.
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