| 摘要 |
The present invention provides a cutting tool insert capable of realizing a sufficiently large axial rake angle, exhibiting improved cutting ability, and conducting stable processing with little cutting vibrations, and also provides a cutting tool on which this insert is mounted. Specifically, an insert 1 and a cutting tool 100 on which the insert 1 is mounted are provided. The insert 1 is in a substantially plate form and of polygonal shape and is provided with a major cutting edge 16A (or 16B) extending from one corner 14A (or 14B) toward the other corner 15A (or 15B) as viewed from above. The major cutting edge 16A (or 16B) comprises a first edge line and a second edge line that meet to form an obtuse angle, which causes the area where the first and second edge lines meet to protrude slightly outwards, as viewed from above. The first edge line slopes down towards the second edge line so as to make the distance with a seat face 11 decrease gradually as viewed from the side, and the first edge line forms an obtuse angle with the second edge line causing the top face area to dip down towards the seat face, and, further, the first edge line is shorter than the second edge line.
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