Indexable cutting insert with chip breaker

1. A cutting insert for chip removing machining, comprising a substantially circular cutting edge formed at a transition between an upper side and an edge surface of the cutting insert, the cutting edge comprising at least one cutting edge portion, the at least one cutting edge portion extending along substantially an entire length of the cutting edge, the upper side comprising a chip surface including at least one chip breaker portion associated with a corresponding cutting edge portion and the edge surface comprising a clearance surface, the edge surface connecting to a lower side of the cutting insert, the lower side comprising means for indexing of the cutting insert, wherein the at least one chip breaker portion is provided at a varying distance from the associated cutting edge portion over substantially an entire length of the associated cutting edge portion, the indexing means is provided at a position relative to a reference line or axis of the tool in order to orient the chip breaker portion in the chip surface to a desired position.

2. The cutting insert as set forth in claim 1 , wherein the indexing means includes a plurality of structures, and a quantity of chip breaker portions is a multiple of a quantity of indexing means structures.

3. The cutting insert according to claim 2 , wherein the cutting insert is single-sided, a plurality of chip breaker portions are evenly radially spaced on the chip surface, and the indexing means structures are evenly radially spaced on the lower side of the cutting insert.

4. The cutting insert according to claim 3 , wherein each chip breaker portion comprises a ridge which follows a curved path substantially in a direction toward a center of the cutting insert and the cutting insert has a same quantity of indexing means structures on the lower side of the cutting insert as a quantity of chip breaker portions on the upper side.

5. The cutting insert according to claim 2 , wherein each chip breaker portion comprises a ridge which follows a curved path substantially in a direction toward a center of the cutting insert and the cutting insert has a same quantity of the indexing means structures on the lower side of the cutting insert as a number of chip breaker portions on the upper side.

6. The cutting insert according to claim 2 , wherein each of the indexing means structures is provided substantially midway between two adjacent chip breaker portions when the cutting insert is seen in a top view.

7. The cutting insert according to claim 2 , wherein each of the indexing means structures forms an acute angle with a centerline of the cutting insert.

8. The cutting insert according to claim 2 , wherein each of the indexing means structures has a width in a plane of the lower side that is no larger than a distance between two adjacent radially external ends of the chip breaker portions.

9. The cutting insert according to claim 2 , wherein a distance between each chip breaker portion and the associated cutting edge portion increases in a direction toward an adjacent chip breaker portion.

10. The cutting insert according to claim 1 , wherein the indexing means includes a plurality of structures and each chip breaker portion comprises a ridge which follows a curved path substantially in a direction toward a center of the cutting insert and the cutting insert has a same quantity of indexing means structures on the lower side of the cutting insert as a quantity of chip breaker portions on the upper side.

11. The cutting insert according to claim 4 , wherein each of the indexing means structures is provided substantially midway between two adjacent chip breaker portions when the cutting insert is seen in a top view.

12. The cutting insert according to claim 11 , wherein each of the indexing means structures forms an acute angle with a centerline of the cutting insert.

13. The cutting insert according to claim 12 , wherein each of the indexing means structures has a width in a plane of the lower side that is no larger than a distance between two adjacent radially external ends of the chip breaker portions.

14. The cutting insert according to claim 13 , wherein a distance between each chip breaker portion and the associated cutting edge portion increases in a direction toward an adjacent chip breaker portion.

15. The cutting insert according to claim 1 , wherein the indexing means includes a plurality of structures and the cutting insert is single-sided, a plurality of chip breaker portions are evenly radially spaced on the chip surface, and the indexing means structures are evenly radially spaced on the lower side of the cutting insert.

16. The cutting insert according to claim 1 , wherein the indexing means includes a plurality of structures and each chip breaker portion comprises a ridge which follows a curved path substantially in a direction toward a center of the cutting insert and the cutting insert has a same quantity of the indexing means structures on the lower side of the cutting insert as a number of chip breaker portions on the upper side.

17. The cutting insert according to claim 1 , wherein the indexing means includes a plurality of structures and each of the indexing means structures is provided substantially midway between two adjacent chip breaker portions when the cutting insert is seen in a top view.

18. The cutting insert according to claim 1 , wherein the indexing means includes a plurality of structures and each of the indexing means structures forms an acute angle with a centerline of the cutting insert.

19. The cutting insert according to claim 1 , wherein the indexing means includes a plurality of structures and each of the indexing means structures has a width in a plane of the lower side that is no larger than a distance between two adjacent radially external ends of the chip breaker portions.

20. The cutting insert according to claim 1 , wherein a distance between each chip breaker portion and the associated cutting edge portion increases in a direction toward an adjacent chip breaker portion.