Indexable drill insert and rotary cutting tool employing same
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United States of America Patent
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Nov 13, 2018
Grant Date -
Jan 5, 2017
app pub date -
Jan 21, 2014
filing date -
Jan 23, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An insert includes four identical cutting edges disposed at the intersection of top and side surfaces surface. Each cutting edge includes a first part edge disposed tangent to a first reference circle aligned about the central mounting aperture; a second part edge extending from the first part edge, the second part edge being connected to the first part edge via a convex curved portion; a third part edge disposed tangent to a second reference circle aligned about the central mounting aperture, the second reference circle having a smaller diameter than the first reference circle, the third part edge being connected to the second part edge via a concave curved portion; and a convexly curved corner portion extending from the third part edge of one of the identical cutting edges to the first part edge of another one of the identical cutting edges.
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