Double-sided tangential cutting insert

Abstract

A double-sided tangential cutting insert (21) includes: two identical opposing end surfaces (25); a peripheral side surface (29) extending between the opposing end surfaces (25), the peripheral side surface (29) including two opposing identical primary side surfaces (31), two opposing identical secondary side surfaces (49), and four corner surfaces (61), each corner surface (61) interconnecting the primary side surface (31) and an adjacent secondary side surface (49); and a connection from one of the primary side surfaces (31) to the other of the primary side surfaces (31). A primary side surface extends through a hole (35) in the blade (21); each of the end surfaces (25) includes: two spaced-apart primary cutting edges (33), each primary cutting edge forming at the intersection between the end surface (25) and one of the primary side surfaces (31); two spaced-apart secondary cutting edges (51), each secondary cutting edge forming at the intersection between the end surface (25) and one of the secondary side surfaces (49); and two diagonally opposite raised corners (26), each raised corner... (26) Having corner cutting edges (63c), each corner cutting edge (63c) being formed at the intersection between one of the corner surfaces (61) of the end surface (25), each corner cutting edge (63c) being positioned between a primary cutting edge (33) and a secondary cutting edge (51); two diagonally opposite lowered corners (27), each lowered corner (27) having a corner non-cutting edge (63nc), each corner non-cutting edge (63nc) being formed in one of the end surface (25) and the corner surface (61). At the intersection between the corner surfaces, each corner non-cutting edge (63nc) is positioned between the main cutting edge (33) and the secondary cutting edge (51); a main rake face (37) adjacent to the main cutting edge (31); a secondary rake face (53) adjacent to the secondary cutting edge (51); a cutting corner rake face (65c) adjacent to the corner cutting edge (63c); and a non-cutting corner rake face (65nc) adjacent to the non-cutting edge (63nc), wherein at least one cutting corner rake face (65c) includes a groove (67) extending in a generally inward direction.

Description

Technical Field

[0001] This invention relates to a double-sided cutting insert for a metal cutting milling tool designed for chip removal. The double-sided cutting insert is a type of double-sided cutting insert tangentially mounted in the milling tool. Background Technology

[0002] Metal cutting milling tools using tangentially mounted cutting inserts are well known in the art. Such inserts are used in a wide range of milling applications, such as square shoulder milling, slot milling, slope milling, helical interpolation, and face milling.

[0003] Tangential cutting inserts, also known as end-cutting inserts or drop-cutting inserts, are oriented in the insert holder of a milling cutter such that during cutting of the workpiece, the cutting force is oriented along the major (thicker) dimension of the cutting insert. The technical advantage of this configuration is that the cutting insert can withstand greater cutting forces than when radially oriented, i.e., when the cutting force is oriented along the smaller (thinner) dimension of the cutting insert.

[0004] EP3233341 discloses a double-sided tangentially mounted cutting insert that helps to provide screw holes of the largest size in the cutting insert while still maintaining considerable strength of the insert.

[0005] This type of insert works well in most applications. However, in some applications, chip control may be an issue. This is particularly noticeable when the insert is used in operations utilizing low depths of cut. In such operations, guiding chips away from the workpiece surface can be problematic. The chips may then become stuck between the workpiece and the rotating milling cutter, potentially causing scratches on the machined surface.

[0006] Therefore, improvements are needed to double-sided tangential cutting inserts to alleviate some of the aforementioned chip control problems.

[0007] Therefore, the object of the present invention is to provide an improved double-sided tangential cutting insert that alleviates some of the problems mentioned above. Summary of the Invention

[0008] According to the present invention, the above objective is achieved by a double-sided tangential cutting insert having the features defined in the present invention.

[0009] The double-sided tangential cutting insert according to the invention comprises: two identical opposing end surfaces and a peripheral side surface extending between the opposing end surfaces. The peripheral side surface includes two opposing identical primary side surfaces, two opposing identical secondary side surfaces, and four corner surfaces. Each corner surface interconnects a primary side surface and an adjacent secondary side surface. A hole extends through the insert from one of the primary side surfaces to the other primary side surface. Each end surface includes: two spaced-apart primary cutting edges, each formed at the intersection between the end surface and one of the primary side surfaces. Each end surface includes two spaced-apart secondary cutting edges, each formed at the intersection between the end surface and one of the secondary side surfaces. Each end surface includes two diagonally opposite raised corners, each raised corner having a corner cutting edge. Each corner cutting edge is formed at the intersection between the end surface and one of the corner surfaces, and is positioned between a primary cutting edge and a secondary cutting edge. Each of the end surfaces includes two diagonally opposite lowered corners, each lowered corner having a corner non-cutting edge. Each corner non-cutting edge is formed at the intersection between one of the end surfaces and the corner surfaces. Each corner non-cutting edge is positioned between a primary cutting edge and a secondary cutting edge. The primary rake face is positioned adjacent to the primary cutting edge. The secondary rake face is positioned adjacent to the secondary cutting edge. The cutting corner rake face is positioned adjacent to the corner cutting edge, and the non-cutting corner rake face is positioned adjacent to the non-cutting edge. At least one cutting corner rake face includes a groove extending in a generally inward direction.

[0010] For the purposes of this application, the rake face and the cutting edge should be considered adjacent; however, a cutting edge band may be provided between them. The presence of a cutting edge band or polished portion between the rake face and the cutting edge is well known in the art, and its primary purpose is to strengthen the cutting edge.

[0011] The general inward direction is from the corner cutting edge toward the center part of the end surface.

[0012] The inventors have recognized that the construction according to the invention alleviates chip control problems when using low depths of cut. A groove extending in a generally inward direction in the at least one corner rake face helps guide the generated chips away from the cutting edge and away from the surface of the workpiece. This reduces the risk of chips being trapped between the insert and the workpiece surface, thereby reducing the risk of scratches on the workpiece surface due to trapped chips. Therefore, the insert according to the invention produces a workpiece surface with improved surface finish. Furthermore, improved chip control results in less insert wear and less heat generation within the insert. These factors lead to an extended cutting insert life.

[0013] According to one embodiment, all cutting corner rake faces include grooves extending in a generally inward direction.

[0014] This construction ensures that all indexing positions of the insert achieve the advantage of having an inwardly pointing groove in the rake face at the cutting corner.

[0015] According to one embodiment, the groove extends from the corner cutting edge.

[0016] This design ensures that the grooves efficiently guide chips away from the cutting edge, because the grooves start as close as possible to where the chips are generated.

[0017] According to one embodiment, the groove extends to a support surface located on the end surface or to a transition surface connecting the support surface and the rake face of the cutting corner.

[0018] This design ensures that chips are guided away from the rake face at the cutting corner. This reduces the risk of chips being trapped between the rake face at the corner and the working surface.

[0019] According to one embodiment, the groove is generally straight when viewed in a view toward the end surface.

[0020] This design ensures that the chips are effectively guided by the grooves and reduces the risk of chips being trapped in the grooves.

[0021] According to one embodiment, in a view toward the end surface, the groove forms an angle α with the plane defined by the main side surface, the angle being greater than 7°, preferably greater than 12°, and most preferably greater than 15°.

[0022] This angle is defined starting from the center of the groove, where the center is the midpoint of the groove in the width direction.

[0023] This design ensures that chips are effectively guided away from the main cutting edge.

[0024] According to one embodiment, in a view toward the end surface, the groove forms an angle α with the plane defined by the main side surface 31, which is less than 27°, preferably less than 22°, and most preferably less than 19°.

[0025] This angle is defined starting from the center of the groove, where the center is the midpoint of the groove in the width direction.

[0026] This design ensures that chips are effectively guided away from the secondary cutting edge.

[0027] According to one embodiment, the groove has a generally concave bottom with a first radius R3, and the cutting corner rake face has a generally concave shape in a cross section perpendicular to the length of the groove with a second radius R4, wherein the first radius R3 is smaller than the second radius R4.

[0028] In some embodiments, the second radius R4 can be close to infinity because the cutting corner rake face can be approximately straight in a cross section perpendicular to the length of the groove.

[0029] According to one embodiment, the groove has a depth D, which is at least 0.03 mm, more preferably 0.05 mm.

[0030] This construction ensures that the grooves are deep enough to effectively guide the chips in the desired direction.

[0031] According to one embodiment, the length of the groove is at least 5% of the length of the diagonal between the raised corners of the end surface, more preferably 10%, and most preferably 15%.

[0032] This design ensures that the grooves are long enough to effectively guide the chips in the desired direction.

[0033] According to one embodiment, when the cutting insert is mounted in a milling cutter, two separate support surfaces for supporting the cutting insert are positioned on each side of a central plane CP that divides the end surface into two equal parts and extends along the central axis of the hole and is substantially perpendicular to the plane of the main side surface and the plane of the support surface.

[0034] This design ensures that the cutting inserts can be stably mounted in the milling tool.

[0035] According to one embodiment, the support surface is the end surface closest to the intermediate plane (MP) located, which extends along the central axis of the hole and is substantially perpendicular to the planes of the primary side surface and the secondary side surface.

[0036] According to one embodiment, each support surface is surrounded by a transition surface that extends in a direction away from the intermediate plane and forms an obtuse angle with the support surface.

[0037] This design ensures high-precision positioning of the cutting insert within the milling cutter's insert holder, because if the insert is initially slightly misaligned, the transition surface will guide it to the correct position. Properly positioning the cutting insert within the milling cutter's insert holder is crucial when achieving high surface finishes. Even slight misalignment can cause scratches on the workpiece surface.

[0038] According to an embodiment, in a cross section perpendicular to the main side surface, the transition surface forms a first angle δ with the plane defined by the main side surface, and the main rake face forms a second angle β with the plane defined by the main side surface, wherein the transition surface is adjacent to the main rake face, and the second angle β is greater than the first angle δ.

[0039] This design ensures that chips generated along the main cutting edge will only contact the main rake face, because the small initial angle δ of the transition surface ensures that the transition surface will not act as a rake face. This means that the rake face will be relatively narrow, and the chip will not deform due to the transition from one rake face to another. A narrower rake face means that the chip will contact the rake face over a relatively short distance. This, combined with minimal chip deformation, results in less heat generation, which is especially important when machining difficult-to-machine materials such as stainless steel and heat-resistant superalloys.

[0040] The present invention also relates to a milling tool comprising a tool body and at least one double-sided tangential cutting insert according to any of the above embodiments, wherein each of the at least one double-sided tangential cutting insert is detachably mounted in an insert holder of the tool body. Attached Figure Description

[0041] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: Figure 1 This is a perspective view of a double-sided tangential cutting blade according to an embodiment of the present invention.

[0042] Figure 2 It is facing Figure 1 A view of the main side surface of a double-sided tangential cutting insert.

[0043] Figure 3 It is facing Figure 1 A view of the secondary side surface of a double-sided tangential cutting insert.

[0044] Figure 4 It is facing Figure 1 A view of the end surface of a double-sided tangential cutting insert.

[0045] Figure 4a Is Figure 4 A cross-sectional view of a portion of a double-sided tangential cutting insert taken at section IVa-IVa.

[0046] Figure 4b Is Figure 4 A cross-sectional view of a portion of a double-sided tangential cutting insert taken at section IVb-IVb.

[0047] Figure 4c Is Figure 4A cross-sectional view of a portion of a double-sided tangential cutting insert taken at section IVc-IVc.

[0048] Figure 5 This is a perspective view of a milling tool according to an embodiment of the present invention.

[0049] Figure 6 yes Figure 5 A perspective view of a milling cutter, in which the double-sided tangential cutting insert has been removed. Detailed Implementation

[0050] The double-sided tangential cutting insert 21 according to the present invention is in Figures 1 to 4 As shown in the figure. According to another aspect of the invention, such as Figure 5 and Figure 6 As shown, the insert 21 is suitable for use with the milling cutter 100.

[0051] The blade 21 includes two identical end surfaces 25, each of which is generally rectangular in shape. The blade 21 further includes a peripheral side surface 29 extending between the opposing end surfaces 25.

[0052] The outer side surface 29 includes two opposing, identical main side surfaces 31. The main side surfaces 31 are planar and parallel to each other. According to... Figures 1 to 4 In the illustrated embodiment, each primary side surface 31 includes a primary clearance surface 69 adjacent to each primary cutting edge 33. Alternative embodiments include inserts with fewer or no such primary clearance surfaces. Each end surface 25 includes two spaced-apart primary cutting edges 33 formed at the intersection between the end surface 25 and one of the primary side surfaces 31. Thus, the insert 21 includes four primary cutting edges 33. A primary rake face 37 is formed adjacent to the primary cutting edges 33 in the end surface 25. For the purposes of this application, the rake face and the primary cutting edges should be considered adjacent; however, a cutting edge band 34 may be disposed between them.

[0053] The peripheral side surface 29 further includes two opposing, identical secondary side surfaces 49. The secondary side surfaces 49 are generally planar and parallel to each other. Each end surface 25 includes two spaced-apart secondary cutting edges 51 formed at the intersection of one of the secondary side surfaces 49 and the end surface 25. Therefore, the insert 21 includes four secondary cutting edges 51. A secondary rake face 53 is formed adjacent to the secondary cutting edges 51 in the end surface 25.

[0054] The peripheral side surface 29 further includes four corner surfaces 61. Each corner surface 61 is interconnected with a main side surface 31 and a secondary side surface 49.

[0055] Hole 35 extends through insert 21 from one of the main side surfaces 31 to the other of the main side surfaces 31. Hole 35 is used to mount insert 21 in insert holder 106 of milling cutter 100 by fastening element in the form of screw 200.

[0056] Each end surface 25 includes two diagonally opposite raised corners 26 and two diagonally opposite lowered corners 27. The raised corners 26 are raised because they are the corners furthest from the intermediate plane (MP), which extends along the central axis of the hole 35 and is substantially perpendicular to the planes of the primary side surface 31 and the secondary side surface 49. As the travel proceeds from the raised corners 26 to the lowered corners 27, both the primary cutting edge 33 and the secondary cutting edge 51 descend toward the intermediate plane (MP).

[0057] Each reduced corner 27 has a corner non-cutting edge 63nc. The corner non-cutting edge 63nc is formed at the intersection between one of the corner surfaces, the end surface 25 and the corner surface 61. The non-cutting corner rake face 65nc is located near the non-cutting edge 63nc. When the double-sided tangential cutting insert 21 is mounted and used in the milling tool 100, the non-cutting edge 63nc does not function in the actual cutting process.

[0058] Each raised corner 26 has a corner cutting edge 63c. The corner cutting edge 63c is formed at the intersection between one of the corner surfaces, the end surface 25 and the corner surface 61. The corner rake face 65c is located near the cutting edge 63c.

[0059] like Figure 4 As shown, the cutting corner rake face includes a groove 67. The groove 67 is generally straight and extends inward from the corner cutting edge 63c toward a central region of the end surface 25. This central region is located approximately near the geometric center of the end surface 25. Preferably, the groove extends inward toward the geometric center of the end surface 25. In the illustrated embodiment, the groove 67 extends to a transition surface 41. The transition surface 41 transitions to a support surface 39, as will be described in more detail later.

[0060] The grooves help guide chips generated during the cutting operation away from the cutting edge. This reduces the risk of chips being trapped between the insert 21 and the working surface. The working surface is the surface machined during the cutting operation. This improves the surface finish of the working surface because trapped chips risk scratching it. Another advantage of this embodiment is that chips are effectively removed from the cutting edge of the insert 21, which improves the thermal control of the insert, and the insert will generally be cooler during use than when the insert 21 does not have the grooves 67. A cooler insert 21 results in increased insert life.

[0061] In a view toward end surface 25, groove 67 forms an angle α with the plane defined by main side surface 31. Angle α is greater than 7°, preferably greater than 12°, and most preferably greater than 15°. Angle α is less than 27°, preferably less than 22°, and most preferably less than 19°.

[0062] The groove angle α is made greater than a specified value to guide the chip away from the main cutting edge 33, and the groove angle α is made less than a specified value to guide the chip away from the secondary cutting edge 51. This reduces the risk of chips being trapped between the working surface and the main cutting edge 33 or between the working surface and the secondary cutting edge 51.

[0063] The length of the groove is at least 5% of the length of the diagonal between the raised corners 26 of the end surface 25, more preferably 10%, and most preferably 15%.

[0064] This ensures that the groove is long enough to effectively guide the chips in the desired direction.

[0065] Figure 4c The cross-sectional view reveals a section perpendicular to the length of the groove 67. The groove 67 has a concave shape with a radius of R3. The standard solution without the groove follows the tangent of the rake face 65c at the cutting corner. The standard solution is as follows... Figure 4c As shown by the dotted line at the top center, the cutting corner rake face 65c has a concave shape with a radius of R4 in a cross-section perpendicular to the length of the groove 67. The radius R4 is greater than the radius R3. If the cutting corner rake face 65c were straight in a cross-section perpendicular to the length of the groove 67, then the radius R4 could be infinite. The outer portion of the groove 67 is furthest from its center in the width direction of the groove. This outer portion includes a convex connecting radius that connects the groove 67 to the cutting corner rake face 65c to achieve a smooth transition between the two surfaces.

[0066] The groove 67 has a depth D. The depth D of the groove should preferably be at least 0.03 mm, more preferably 0.05 mm, to effectively guide the chip away from the cutting edge. The depth D of the groove should preferably be less than 0.15 mm. If the depth D is large, the contact area between the chip and the groove 67 will increase. A larger contact area leads to increased temperature, which in turn leads to increased tool wear.

[0067] Below are some specific values ​​for the embodiment disclosed in the figure. The radius R3 is 3 mm, and the depth D is 0.05 mm. The radius R5 of the corner cutting edge 63c is 0.8 mm in this embodiment. Generally, if the radius R3 is greater than the radius R5 of the corner cutting edge 63c, the chip removal efficiency is improved. Therefore, the optimal ratio between the depth D and the radius R5 of the corner cutting edge 63c is 0.05 / 0.8 = 0.0625. The groove 67 works effectively when the ratio between the depth D and the radius R5 of the corner cutting edge 63c is in the range of 0.04 to 0.2.

[0068] Figure 4b The cross-sectional view shows the entire length of the groove 67. Approximately one-third of the groove 67 closest to the corner cutting edge 63c has a constant depth D. The depth of the groove 67 decreases with distance from the corner cutting edge 63c, reaching zero depth at the end of the groove 67. This configuration results in the most efficient chip removal.

[0069] Each end surface 25 further includes two separate support surfaces 39 located on each side of a central plane (CP). The central plane (CP) divides the end surface 25 into two equal portions and extends along the central axis of the bore 35, and is substantially perpendicular to the plane of the main side surface 31 and the plane of the support surfaces 39. The two support surfaces 39 extend within a single common plane, which is parallel to the intermediate plane (MP). The support surfaces 39 are the areas of the end surface 25 closest to the intermediate plane (MP).

[0070] Each support surface 39 is surrounded by a transition surface 41. The transition surface 41 extends in a direction away from the intermediate plane (MP) and forms an obtuse angle with the support surface 39.

[0071] This configuration helps to precisely position the insert 21 in the insert holder 106 of the milling cutter 100. The obtuse angle of the transition surface 41 guides the insert to its correct position on the radial contact surface 108 of the milling cutter 100.

[0072] Figure 4a The cross-sectional view shows how the transition surface 41 connects the support surface 39 and the main rake face 37. The transition surface 41 forms a first angle (δ) with the plane defined by the main side surface 31, and the main rake face 37 forms a second angle (β) with the plane defined by the main side surface 31. The second angle (β) is greater than the first angle (δ).

[0073] The fact that the second angle (β) is greater than the first angle (δ) means that the chip will only contact the main rake face 37 and will lose contact with the cutting tool when it approaches the transition surface 41, because the transition surface 41 descends from the main rake face 37 due to the second angle (β) being greater than the first angle (δ). Therefore, the transition surface 41 will not function as a rake face. This means that the rake face will be relatively narrow, and the chip will not deform due to the transition from one rake face to another. A narrower rake face means that the chip will contact the rake face over a relatively short distance. This, combined with minimal chip deformation, results in less heat generation, which is especially important when machining difficult-to-machine materials such as stainless steel and heat-resistant superalloys.

[0074] Now for reference Figure 5 and Figure 6 , Figure 5 and Figure 6 A milling cutter 100 according to an aspect of the invention is shown. The milling cutter 100 includes a cutter body 101 having a cylindrical base shape. The cutter body includes a front end 102 and a rear end 103, with a central axis of rotation C extending between the front end 102 and the rear end 103. The milling cutter 100 is rotatable about the central axis of rotation C in a rotational direction R. A insert holder 106 is formed at the front end 102 in the peripheral surface of the cutter body 101. A chip space 105 is formed in the peripheral surface of the cutter body 101 for effectively removing chips from the working surface.

[0075] The double-sided tangential cutting insert 21 is mounted in the insert holder 106 by a fastening element in the form of a screw 200. When mounted in the insert holder 106, one of the primary side surfaces 31 of the double-sided tangential cutting insert will contact the insert holder 106. One of the secondary side surfaces 49 will contact the axial contact surface 107 of the milling cutter 100. When the insert 21 is mounted in the milling cutter 100, the support surface 39 of the double-sided tangential cutting insert 21 will contact the two radial contact surfaces 108.

[0076] This construction ensures that the insert 21 is stably and precisely mounted to the insert holder 106. This construction further ensures that one of the primary cutting edges 33 extends approximately in the axial direction of the milling cutter 100, and one of the secondary cutting edges 51 extends approximately in the radial direction of the milling cutter 100. This makes the milling cutter 100 particularly suitable for milling square shoulders.

[0077] Although the invention has been described and illustrated with reference to preferred embodiments, it should be understood that variations and modifications may be made to the invention without departing from the invention as set forth in the claims.

Claims

1. A double-sided tangential cutting insert (21), comprising: Two identical opposite end surfaces (25); The peripheral side surface (29) extending between the opposing end surfaces (25) includes two opposing identical main side surfaces (31), two opposing identical secondary side surfaces (49) and four corner surfaces (61), each corner surface (61) interconnecting a main side surface (31) and an adjacent secondary side surface (49); A hole (35) extends through the blade (21) from one of the main side surfaces (31) to the other of the main side surfaces (31). Each of the end surfaces (25) includes: Two spaced-apart main cutting edges (33), each main cutting edge being formed at the intersection between the end surface (25) and one of the main side surfaces (31); Two spaced-apart secondary cutting edges (51), each secondary cutting edge being formed at the intersection between the end surface (25) and one of the secondary side surfaces (49); Two diagonally opposite raised corners (26), each raised corner (26) having a corner cutting edge (63c), each corner cutting edge (63c) being formed at the intersection between one of the corner surfaces of the end surface (25) and the corner surface (61), each corner cutting edge (63c) being positioned between a main cutting edge (33) and a secondary cutting edge (51); Two diagonally opposite lowered corners (27), each lowered corner (27) having a corner non-cutting edge (63nc), each corner non-cutting edge (63nc) being formed at the intersection between one of the corner surfaces in the end surface (25) and the corner surface (61), each corner non-cutting edge (63nc) being positioned between a primary cutting edge (33) and a secondary cutting edge (51); The main rake face (37) adjacent to the main cutting edge (31); The secondary rake face (53) adjacent to the secondary cutting edge (51); The cutting corner rake face (65c) adjacent to the corner cutting edge (63c); and The non-cutting corner rake face (65nc) adjacent to the non-cutting edge (63nc). The feature is that at least one cutting corner rake face (65c) includes a groove (67) extending in an inward direction. The groove (67) has a concave bottom with a first radius (R3), and the cutting angle rake face (65c) has a concave shape in a cross section perpendicular to the length of the groove (67) with a second radius (R4), wherein the first radius (R3) is smaller than the second radius (R4).

2. The double-sided tangential cutting insert according to claim 1, wherein, All cutting angle rake faces (65c) include inwardly extending grooves (67).

3. The double-sided tangential cutting insert according to claim 1 or 2, wherein, The groove (67) extends from the corner cutting edge (63c).

4. The double-sided tangential cutting insert according to any one of claims 1-2, wherein, The groove extends to the support surface (39) located on the end surface (25) or to the transition surface (41) connecting the support surface (39) and the cutting angle rake face (65c).

5. The double-sided tangential cutting insert according to any one of claims 1-2, wherein, In a view toward the end surface (25), the groove (67) is straight.

6. The double-sided tangential cutting insert according to claim 5, wherein, In a view toward the end surface (25), the groove (67) forms an angle (α) with the plane defined by the main side surface (31), the angle (α) being greater than 7°.

7. The double-sided tangential cutting insert according to claim 5, wherein, In a view toward the end surface (25), the groove (67) forms an angle (α) with the plane defined by the main side surface (31), which is less than 27°.

8. The double-sided tangential cutting insert according to any one of claims 1-2, wherein, The depth (D) of the groove (67) is at least 0.03 mm.

9. The double-sided tangential cutting insert according to any one of claims 1-2, wherein, The length of the groove (67) is at least 5% of the length of the diagonal between the raised corners (26) of the end surface (25).

10. The double-sided tangential cutting insert according to any one of claims 1-2, wherein, Two separate support surfaces (39) for supporting the cutting insert when it is mounted in a milling cutter (100) are positioned on each side of a central plane (CP) that divides the end surface (25) into two equal parts and extends along the central axis of the hole (35) and is perpendicular to the plane of the main side surface (31) and the plane of the support surface (39).

11. The double-sided tangential cutting insert according to claim 10, wherein, Each support surface (39) is the surface of the end surface (25) closest to the intermediate plane (MP), which extends along the central axis of the hole (35) and is perpendicular to the plane of the main side surface (31) and the plane of the secondary side surface (49).

12. The double-sided tangential cutting insert according to claim 11, wherein, Each support surface (39) is surrounded by a transition surface (41) that extends in a direction away from the intermediate plane (MP) and forms an obtuse angle with the support surface (39).

13. The double-sided tangential cutting insert according to claim 12, wherein, In a cross section perpendicular to the main side surface (31), the transition surface (41) forms a first angle (δ) with the plane defined by the main side surface (31), and the main rake face (37) forms a second angle (β) with the plane defined by the main side surface (31), wherein the transition surface is adjacent to the main rake face, and the second angle (β) is greater than the first angle (δ).

14. The double-sided tangential cutting insert according to claim 6, wherein, The angle (α) is greater than 12°.

15. The double-sided tangential cutting insert according to claim 6, wherein, The angle (α) is greater than 15°.

16. The double-sided tangential cutting insert according to claim 7, wherein, The angle (α) is less than 22°.

17. The double-sided tangential cutting insert according to claim 7, wherein, The angle (α) is less than 19°.

18. The double-sided tangential cutting insert according to claim 8, wherein, The depth (D) of the groove (67) is at least 0.05 mm.

19. The double-sided tangential cutting insert according to claim 9, wherein, The length of the groove (67) is at least 10% of the length of the diagonal between the raised corners (26) of the end surface (25).

20. The double-sided tangential cutting insert according to claim 9, wherein, The length of the groove (67) is at least 15% of the length of the diagonal between the raised corners (26) of the end surface (25).

21. A milling cutter (100) comprising a cutter body (101) and at least one double-sided tangential insert (21) according to any one of claims 1-20, wherein each of the at least one double-sided tangential insert (21) is detachably mounted in an insert holder (106) of the cutter body (101).

Images