INSERT FOR DRILL AND CUTTING BLADE REPLACEMENT-TYPE DRILL
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United States of America Patent
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Issued Date -
Jul 7, 2016
app pub date -
Mar 25, 2014
filing date -
Mar 25, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An insert for a drill is provided which is capable of being detachably attached to an axial line side and an outer circumferential side of a tip portion of a drill main body rotated around an axial line, in which cutting edges are formed on ridge portions of a polygonal face in a drill rotation direction of a polygonal flat plate-shaped insert body such that rotation trajectories around the axial line toward a tip side of the drill main body overlap each other when viewed in an axial line direction, and a land is provided on each of the cutting edges. When the insert is attached to the drill main body, a land angle of the land gradually increases to a negative angle side from one end portion of the cutting edge positioned on an outer circumferential side of the drill main body (11) toward the other end portion side of the cutting edge, and a land width of the land gradually increases from the one end portion of the cutting edge toward the other end portion side.
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