DRILL INSERT AND INDEXABLE DRILL
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United States of America Patent
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Issued Date -
Feb 2, 2017
app pub date -
Dec 17, 2014
filing date -
Dec 26, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a drill insert to ensure sufficient chipping resistance with respect to a large cutting load, which is detachably attached to a distal portion of a drill body which is rotated around an axis, in which a polygon face of a polygonal plate-shaped insert body is a rake face, a side face disposed around the rake face is a flank face, a cutting blade is formed on a ridge portion in which the rake face and the flank face intersect each other, the cutting blade includes a honing face, the honing face includes a first convex curved face continuous with the rake face and a second convex curved face continuous with the flank face, and in a cross section orthogonal to the cutting blade, a curvature radius of the first convex curved face is larger than a curvature radius of the second convex curved face.
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