Heat management drilling system and method
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United States of America Patent
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Apr 23, 2002
Grant Date -
N/A
app pub date -
Apr 6, 2000
filing date -
Apr 6, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is embodied in an earth boring tool comprising a bit body having a rotatable working head portion with a cutter element having a wear table of superhard material bonded to a substrate, and wherein the superhard and substrate materials have different coefficient properties creating a stress condition at their interface during bonding and wherein the cutter elements are stress relieved in situ on the bit body by low temperature heat annealing for a preselected time, and in which the cutter elements and bit body head portion are constructed and arranged for heat management in a dry, vacuum drilling operation. The invention further involves the heat management system and method of the stress relief process of heat annealing PCD cutter elements in situ, either alone or with a subsequent cryogenic tempering process.
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