| 摘要 |
A drill bit including at least one rolling cutter body with rows of relatively hard substantially outwardly projecting and circumferentially spaced cutting inserts projecting from the cutter body and having effective erosion reducing features by application of hardfacing materials placed in oriented regular patterns and shapes on designated critical and vulnerable cutter body areas. The cutter body is produced by a method wherein the body is marked in specific locations of desired patterns, shapes, or boundaries, and, then, hardfacing is applied in these specific boundaries to avoid the insert hole locations. After the hardfacing is permanently bonded to the specified areas, the holes are drilled and the hard cutting inserts are pressed into the holes.
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