Mosaic diamond drag bit cutter having a nonuniform wear pattern
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Jan 6, 1992
filing date -
Jan 6, 1992
priority date (Note) -
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Abstract
A cutter for a rotating drag bit which has a cutting face formed from a plurality of polycrystalline diamond compact (PCD) elements. The elements can be of varying thickness and/or varying hardness to provide a cutting edge having a nonuniform wear pattern. Also provided is a cutter which includes two layers of PCD elements. The PCD elements can be of varying thickness and/or hardness to provide a cutter which presents a cutting edge having a wear ratio which varies with cutter wear. Also provided is an impact cutter having a cutting surface formed from one or more layers of PCD elements.
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