Engineered enhanced inserts for rock drilling bits
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United States of America Patent
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Mar 13, 2001
Grant Date -
N/A
app pub date -
Feb 13, 1998
filing date -
Feb 13, 1998
priority date (Note) -
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Abstract
Enhanced inserts are formed having a cylindrical grip and a protrusion extending from the grip. An ultra hard material layer is bonded on top of the protrusion. The inserts are mounted on a rock bit and contact the earth formations off center. The ultra hard material layer is thickest at a critical zone which encompasses a major portion of the region of contact between the insert and the earth formation. Transition layers may also be formed between the ultra hard material layer and the protrusion so as to reduce the residual stresses formed on the interface between the ultra hard material and the protrusion.
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