CUTTING INSERT

Abstract

A cutting insert for a cutting tool includes a body having a cutting edge, a rake face, and micro channels provided on the rake face adjacent the cutting edge. The micro channels define a grid pattern of micro channels that intersect each other in a region of the rake face where contact between a chip and the rake face is assumed to occur during cutting with the cutting insert.

Claims

1. A cutting insert for a cutting tool, comprising a body having: a cutting edge, a rake face, and micro channels provided on said rake face adjacent the cutting edge, wherein the micro channels define a grid pattern of micro channels that intersect each other in a region of the rake face, wherein contact between a chip and the rake face occurs during cutting with the cutting insert.

2. The cutting insert according to claim 1, wherein the micro channels comprises at least two micro channels extending in a first direction and at least two micro channels extending in a second direction and intersecting the micro channels extending in the first direction.

3. The cutting insert according to claim 2, wherein the first direction is perpendicular to the second direction.

4. The cutting insert according to claim 2, wherein that the first direction is parallel with the adjacent cutting edge.

5. The cutting insert according to claim 1, wherein each micro channel has a width in the range of 20-1000 μm.

6. The cutting insert according to claim 1, wherein each micro channel has a width of at least 50 μm.

7. The cutting insert according to claim 1, wherein each micro channel has a width of 200 μm or less.

8. The cutting insert according to claim 1, wherein each micro channel has a depth in the range of 20-1000 μm.

9. The cutting insert according to claim 1, wherein each micro channel has a depth of at least 50 μm.

10. The cutting insert according to claim 1, wherein each micro channel has a depth of 200 μm or less.

11. The cutting insert according to claim 1, wherein a distance between neighboring micro channels that do not intersect each other is at least 1.5 times the width of the respective micro channel.

12. The cutting insert according to claim 1, wherein the micro channels are at a distance k1 from the cutting edge, wherein 200 μm≤k1≤3 mm.

13. The cutting insert according to claim 12, wherein an intersection of the micro channels is at a distance k2 from the cutting edge, wherein k1≤k2≤k1+0.5 mm.

14. The cutting insert according to claim 1, further comprising cooling channels provided inside said body, said cooling channels being configured to be connected to a cooling medium source, and that wherein the cooling channels have outlets in a region of the grid pattern defined by the micro channels.

15. The cutting insert according to claim 14, wherein the outlets of the cooling channels have a diameter which is at least 3 times the width of the micro channels.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0023] Embodiments of the invention will now be described in detail with regard to the annexed drawing, on which:

[0024] FIG. 1 is a perspective view of a cutting insert according to the invention, and a tool holder,

[0025] FIG. 2 is a planar view from above of a part of the cutting insert shown in FIG. 1,

[0026] FIG. 3 is a cross section according to II-II in FIG. 2,

[0027] FIG. 4 is a perspective view of an alternative embodiment of a cutting insert according to the invention, and

[0028] FIG. 5 is a planar view from above of a part of the cutting insert shown in FIG. 4.

DETAILED DESCRIPTION OF EMBODIMENTS

[0029] Reference is made to FIGS. 1 and 2, showing a cutting insert for a cutting tool, said cutting insert comprising a body 1 having a cutting edge 2, a rake face 3, and micro channels 4, 5 provided on said rake face 3 adjacent the cutting edge 2. The micro channels 4, 5 define a grid pattern, indicated with reference number 6 in FIG. 1. The micro channels 4, 5 intersect each other and form the grid pattern 6 in a region of the rake face 3 where contact between a chip and the rake face 3 is assumed to occur during cutting with the cutting insert. The cutting insert is particularly configured for the cutting of metals. FIG. 1 also shows tool holder 7 configured to hold the cutting insert during operation.

[0030] The grid pattern 6 formed by the micro channels 4, 5 is located between the cutting edge 2 and a chip breaker 8 provided on the rake face 3.

[0031] The micro channels 4, 5 comprise at least two micro channels 4 extending in a first direction x and at least two micro channels 5 extending in a second direction y, intersecting the micro channels 4 extending in the first direction x. In the shown embodiment, the first direction x is perpendicular to the second direction y. However, the first direction x is not limited to this orientation. In the shown embodiment, the first direction x is parallel with the adjacent cutting edge 2.

[0032] With reference to FIG. 3, each channel 4, 5 has a width W of approximately 100 μm, and a depth D of approximately 100 μm. The distance L between neighboring micro channels 4, 5 that do not intersect each other, i.e. parallel channels extending in the same direction, is approximately 150 μm.

[0033] The micro channels 5 closest to the cutting edge 2 are at a distance k1 from the cutting edge 2 of approximately 300 μm. In the shown embodiment, these micro channels 5 extend in the second direction y, which is perpendicular to the cutting edge 2. However, the invention does not exclude that it is a micro channel 4 extending in parallel with the cutting edge 2 which is closest to the cutting edge 2. In the shown embodiment, the intersection closest to the cutting edge is located at a distance k2 from the adjacent cutting edge of approximately 400 μm. In the shown embodiment, the remote opposite end of the grid pattern is located at a distance of approximately 2 mm from the cutting edge. However, the remote opposite end of the grid pattern can be located at a distance of the total length of the rake face 3. In other words, there is no limitation in the distance between the cutting edge 2 and the remote opposite end of the grid pattern.

[0034] Reference is made to FIGS. 4 and 5, which show an alternative embodiment. In this embodiment, the cutting insert further comprises cooling channels 9 provided inside said body 1. The cooling channels 9 are configured to be connected to a cooling medium source, such as a water distribution conduit arranged in the tool holder 7. The cooling channels 9 have outlets 10 in the region of the grid pattern 6 defined by the micro channels 4, 5.

[0035] Each of the outlets 10 of the cooling channels 9 has a diameter d which is at least 3 times the width W of the micro channels 4, 5.

[0036] The cooling channels 9 also have branches 11, which have outlets 12 in a clearance face 13 of the cutting insert, adjacent the cutting edge 2.

[0037] The cooling channels 9 and their branches 11 have been drilled by electro discharge machining, EDM, while the micro channels 4, 5 have been generated by a picosecond pulse laser. Other suitable methods are, of course, also conceivable.

[0038] The micro channels 4, 5 could be generated either prior or after coating of the cutting insert.

[0039] The project leading to this application has received funding from the Clean Sky 2 Joint Undertaking under the European Union's Horizon 2020 research and innovation programme under grant agreement No 754807.