Cutting tool
A cutting tool includes a cutting insert having an anti-rotation stopping indent formed in a transition between a bottom surface and a side surface thereof and includes a first stop surface. The insert seat has at least one anti-rotation stop, which protrudes with respect to a side wall of the insert seat and includes a second stop surface. The anti-rotation stop is arranged to inhibit rotation of the cutting insert in the insert seat by contact between the first and second stop surfaces. The second stop surface is completely located within the anti-rotation stopping indent when the cutting insert is mounted. As seen in a section perpendicular to a common central axis, an angle of less than 180 ° is formed between a tangent to the second stop surface and a tangent to the first duct at a transition between the two.
1. A cutting tool for chip removing machining of workpieces, the cutting tool comprising:
a body; and
at least one cutting insert arranged to be mounted in an insert seat of the body, the cutting insert and the insert seat sharing a common central axis when the cutting insert is mounted in the insert seat, wherein the cutting insert has a circular basic shape and comprises:
a rake surface,
a bottom surface opposite to the rake surface,
a side surface extending between the rake surface and the bottom surface,
a cutting edge formed in a transition between the side surface and the rake surface, and
at least one anti-rotation stopping indent formed in a transition between the bottom surface and the side surface and including a first stop surface, wherein the insert seat of the body comprises:
a bottom support surface configured to abut and support the bottom surface of the cutting insert,
a side wall including at least one side support surface configured to abut and support the side surface of the cutting insert,
at least one anti-rotation stop protruding with respect to the side wall and comprising a second stop surface, and
a concavely curved first duct separating the second stop surface from the side wall, wherein the at least one anti-rotation stop is arranged to inhibit rotation of the cutting insert in the insert seat about the common central axis by contact between the first stop surface and the second stop surface, wherein the second stop surface is completely located within the anti-rotation stopping indent when the cutting insert is mounted in the insert seat, and, when seen in a section taken perpendicularly to the common central axis, an angle of less than 180° is formed between a tangent to the second stop surface and a tangent to the first duct at a transition between the second stop surface and the first duct, and
a concavely curved second duct extending between the second stop surface and the bottom support surface.
2. The cutting tool according to claim 1 , wherein the second stop surface and the first stop surface are symmetric with respect to an axial plane containing the common central axis and intersecting the anti-rotation stopping indent.
3. The cutting tool according to claim 1 , wherein the first duct is indented with respect to the side wall.
4. The cutting tool according to claim 1 , wherein the second stop surface is convexly curved when seen in a section taken perpendicularly to the common central axis.
5. The cutting tool according to claim 1 , wherein the first stop surface is concavely curved when seen in a section taken perpendicularly to the common central axis.
6. The cutting tool according to claim 1 , wherein the second stop surface intersects an axial plane containing the common central axis along a first line, the first line being obliquely inclined with respect to the bottom support surface.
7. The cutting tool according to claim 1 , wherein the at least one anti-rotation stopping indent has a cross sectional area that decreases in an upward axial direction from the bottom surface.
8. The cutting tool according to claim 1 , wherein the first stop surface and the second stop surface are configured so that the contact occurring between the first stop surface and the second stop surface upon rotation of the cutting insert about the common central axis is a line contact.
9. The cutting tool according to claim 1 , wherein the at least one anti-rotation stopping indent has an axial extension along the common central axis, which axial extension is between 30-60% of a total axial extension of the at least one cutting insert.
10. The cutting tool according to claim 1 , wherein the second stop surface includes a pair of planar surface portions adjacent to the first duct.
11. The cutting tool according to claim 1 , wherein the at least one side support surface of the insert seat includes two side support surfaces provided on opposite sides of the anti-rotation stop.
12. The cutting tool according to claim 1 , wherein the anti-rotation stop and the anti-rotation stopping indent are configured so that the contact between the first stop surface and the second stop surface occurs at least partially on the transition between the second stop surface and the first duct.
13. The cutting tool according to claim 1 , wherein the body is a tool body having a front end arranged for cutting engagement with a workpiece and a rear end arranged for mounting the cutting tool to a tool holder, wherein the insert seat is provided in the front end of the body.
14. The cutting tool according to claim 1 , wherein the cutting tool is a milling tool.