Cutting insert and cutting edge replaceable cutting tool

Abstract

To provide a cutting insert that is formed in a bent shape, which can stably perform machining even in machining applications other than grooving.SOLUTION: A cutting insert, which is used while being held on an upper jaw part and a lower jaw part of a holder of a cutting edge replaceable cutting tool, comprises a rod-like body part extending in a first direction and a rod-like cutting blade part connected to the body part through a bent part and extended in a second direction different from the first direction. A surface at one side of the cutting insert when viewed from a third direction that is orthogonal to both of the first direction and the second direction is a lower surface supported by the lower jaw part and a surface at the opposite side of the lower surface is an upper surface supported by the upper jaw part. The upper surface is provided with a region to be pressed that is pressed by the upper jaw part. A protrusion part partially protruding upward from the upper surface is formed at a region made adjacent to the region to be pressed from the opposite side of the bent part in the first direction, of the upper surface.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a cutting insert and an indexable cutting tool.

Background Art

[0002] Conventionally, a cutting tool for internal groove machining provided with an L-shaped cutting insert has been known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A cutting tool provided with an L-shaped cutting insert is assumed to be used not only for grooving but also for profiling. The L-shaped cutting insert has a rod-shaped main body portion held by a holder and a cutting portion extending from the tip of the main body portion in a direction orthogonal to the main body portion. When profiling is performed using the L-shaped cutting insert, a force in the direction of pulling out the cutting insert from the holder acts on the cutting insert, so there is a risk that the clamping position of the cutting insert will shift.

[0005] One object of the present invention is to provide a cutting insert having a bent shape that enables stable machining even in machining applications other than grooving, and an indexable cutting tool provided with the same.

Means for Solving the Problems

[0006] According to one aspect of the present invention, there is provided a cutting insert that is held and used in an upper jaw portion and a lower jaw portion of a holder of a cutting tool with replaceable cutting edges, the cutting insert including a rod-shaped main body portion extending in a first direction, and a rod-shaped cutting edge portion connected to the main body portion via a bent portion and extending in a second direction different from the first direction. One surface of the cutting insert viewed from a third direction orthogonal to both the first direction and the second direction is a lower surface supported by the lower jaw portion, and the surface opposite to the lower surface is an upper surface supported by the upper jaw portion. The upper surface has a pressed area pressed by the upper jaw portion. Among the upper surface, a protruding portion that partially protrudes upward from the upper surface is provided in a region adjacent to the pressed area on the side opposite to the bent portion in the first direction.

[0007] According to the above configuration, a protruding portion is provided in a region adjacent to the pressed area of the cutting insert. When a force in the direction of pulling out the cutting insert is applied in profiling or the like, the protruding portion catches on the upper jaw portion, thereby suppressing the displacement of the position of the cutting insert. According to the above cutting insert, stable machining is possible even in machining applications other than grooving.

[0008] The protruding portion may be configured to be disposed at a position adjacent to the pressed area.

[0009] The upper surface may have a concave groove extending along the first direction, and the protruding portion may be located on the bottom surface of the concave groove.

[0010] The upper surface may have a concave groove extending along the first direction, the concave groove having a pair of inclined surfaces arranged in a V shape when viewed from the first direction, and the protruding portion may be arranged on each of the pair of inclined surfaces.

[0011] The protruding portion may be a linear protrusion extending along the first direction.

[0012] According to one aspect of the present invention, there is provided a cutting tool with replaceable cutting edges including the above cutting insert and a holder for holding the cutting insert.

Advantages of the Invention

[0013] According to one aspect of the present invention, there is provided a cutting insert having a bent shape, which enables stable machining even in machining applications other than grooving, and a tip-exchangeable cutting tool including the same.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0015] FIG. 1 is a partial perspective view of an insert-exchangeable cutting tool according to an embodiment. FIG. 2 is a partial side view of the insert-exchangeable cutting tool according to the embodiment. FIG. 3 is a partial plan view of the insert-exchangeable cutting tool according to the embodiment. FIG. 4 is a cross-sectional view of the insert-exchangeable cutting tool taken along line IV-IV of FIG. 3. FIG. 5 is a perspective view of a cutting insert according to the embodiment. FIG. 6 is a side view of the cutting insert according to the embodiment as viewed from a first direction.

[0016] The insert-exchangeable cutting tool 100 shown in FIG. 1 includes a holder 1 and a cutting insert 10. The holder 1 has a square prism-shaped shank portion 2 and a head portion 3 connected to the tip end portion of the shank portion 2 in the longitudinal direction. The holder 1 is made of, for example, steel. In the present embodiment, in the insert-exchangeable cutting tool 100, the direction from the shank portion 2 toward the head portion 3 is referred to as the tip side, and the direction from the head portion 3 toward the shank portion 2 is referred to as the rear end side. Further, the vertical direction in the following description refers to the vertical direction in FIGS. 1 and 2.

[0017] The head portion 3 has a slit 3a extending from the tip of the head portion 3 toward the shank portion 2 side. Among the head portion 3, the portion above the slit 3a is the upper jaw portion 3b, and the portion below the slit 3a is the lower jaw portion 3c. As shown in FIG. 2, the shank portion 2 is connected to the rear of the lower jaw portion 3c of the head portion 3. The height position of the slit 3a generally coincides with the height position of the upper surface 2b of the shank portion 2. The connecting portion 3d between the upper jaw portion 3b and the lower jaw portion 3c is thin, and the upper jaw portion 3b is deformable so as to bend toward the lower jaw portion 3c side with the connecting portion 3d as a fulcrum.

[0018] As shown in FIG. 2, the lower jaw portion 3c has a pedestal portion 4 having a substantially rectangular plate shape at the tip end portion of the lower jaw portion 3c. A pedestal surface 5 formed of a flat surface having a rectangular shape in plan view is formed on the upper surface of the pedestal portion 4. The pedestal surface 5 extends from the tip of the lower jaw portion 3c to the middle of the slit 3a in the longitudinal direction of the holder 1.

[0019] As shown in Fig. 4, the base surface 5 has a support protrusion 5a that protrudes toward the upper jaw portion 3b. The support protrusion 5a is a linear protrusion that extends along the extension direction of the base surface 5 (left-right direction in Fig. 4). The support protrusion 5a is a protrusion with a convex V-shaped cross section, with the central portion in the width direction of the base surface 5 swelling upward in the figure.

[0020] As shown in FIG. 2, the upper jaw 3b has a pressing portion 6 at its tip. The pressing portion 6 is a triangular plate in a side view that tapers toward the tip. The tip of the pressing portion 6 is located rearward of the tip of the lower jaw 3c. A pressing surface 7 is formed on the surface of the pressing portion 6 facing the base 4. The pressing surface 7 extends from the tip of the upper jaw 3b to the middle of the slit 3a. The rear end of the pressing surface 7 is located forward of the rear end of the base surface 5.

[0021] As shown in Fig. 4, the pressing surface 7 has a pressing protrusion 7a that protrudes toward the lower jaw 3c. The pressing protrusion 7a is a linear protrusion that extends along the direction in which the pressing surface 7 extends (left-right direction in Fig. 4). The pressing protrusion 7a is a protrusion with a convex V-shaped cross section, with the central part in the width direction of the pressing surface 7 swelling downward in the figure. In this embodiment, the surface facing the rear end side of the pressing protrusion 7a (rear end surface) is an inclined surface that slopes upward toward the rear end side.

[0022] In the holder 1, the seat surface 5 of the seat portion 4 and the pressing surface 7 of the pressing portion 6 are disposed opposite to each other in the vertical direction.

[0023] The holder 1 is provided with a clamp screw 22 that is inserted from above into the head portion 3 at the tip of the holder 1 as a clamping means for the insert mounting seat 8. The clamp screw 22 passes through the slit 3a from the upper jaw portion 3b side and is tightened into a screw hole in the lower jaw portion 3c. By tightening the clamp screw 22, the cutting insert 10 that is inserted between the upper jaw portion 3b and the lower jaw portion 3c can be fixed.

[0024] As shown in FIGS. 5 and 6, the cutting insert 10 is a cutting insert having an L-shaped bent configuration in plan view. The cutting insert 10 has a bent portion 13, a rod-shaped main body portion 12 extending along a first direction d1 with the bent portion 13 as a base point, and a rod-shaped cutting edge portion 16 extending along a second direction d2 orthogonal to the first direction d1 with the bent portion 13 as a base point. A third direction d3 is a direction orthogonal to both the first direction d1 and the second direction d2, that is, the vertical direction. In the present embodiment, the main body portion 12, the bent portion 13, and the cutting edge portion 16 are parts of the cutting insert 10 of a single member. In the present embodiment, the direction from the bent portion 13 toward the main body portion 12 is defined as the positive side of the first direction d1, and the direction from the bent portion 13 toward the cutting edge portion 16 is defined as the positive side of the second direction d2.

[0025] The cutting insert 10 has an L-shaped bend at 90° at the bent portion 13. The bending angle of the cutting insert 10 is not limited to 90°, and can be any angle of 1° or more and 90° or less.

[0026] The cutting insert 10 has, on its upper surface, a pressed area 14 that faces the pressing surface 7 of the pressing portion 6 and is pressed by the pressing surface 7. In the case of the present embodiment, the pressed area 14 is provided on the upper surface of the main body portion 12. The cutting insert 10 has, on a part of its lower surface, a seating surface 15 that faces the pedestal surface 5 of the pedestal portion 4. In the case of the present embodiment, the lower surface of the main body portion 12 and a part of the lower surface of the bent portion 13 constitute the seating surface 15.

[0027] The cutting edge portion 16 extends along a second direction d2 orthogonal to the main body portion 12. Cutting edges 17 are formed on three sides at the upper surface end of the cutting edge portion 16. The cutting edges 17 are formed on a side that extends substantially parallel to the longitudinal direction (first direction d1) of the main body portion 12 and on two sides that are adjacent to this side and extend along the extending direction (second direction d2) of the cutting edge portion 16 at the tip portion of the upper surface of the cutting edge portion 16. The side surface of the cutting edge portion 16 continuous with the cutting edge 17 is defined as a relief surface 18 of the cutting edge 17. The upper surface portion of the cutting edge portion 16 continuous with the cutting edge 17 is defined as a rake surface 19.

[0028] On the upper surface of the main body portion 12, a concave groove 11 having a substantially V-shaped cross-section extends. The concave groove 11 extends linearly along the first direction d1. The concave groove 11 is formed in a V-shape by a pair of inclined surfaces 11a, 11b that are separated from each other as they go upward, and a bottom surface 11c located between the inclined surfaces 11a, 11b. The bottom surface 11c is located at the central portion in the width direction of the concave groove 11 and extends linearly along the concave groove 11.

[0029] In the cutting insert 10 of the present embodiment, the upper surface of the main body portion 12 protrudes above the upper surfaces of the cutting edge portion 16 and the bent portion 13. As shown in FIG. 6, the concave groove 11 is formed so as to notch the central portion in the width direction of the protruding portion 12a on the main body portion 12 along the first direction d1. Therefore, the upper end portion of the concave groove 11 is located above the upper surfaces of the cutting edge portion 16 and the bent portion 13. The height position of the bottom surface 11c of the concave groove 11 generally coincides with the height positions of the upper surfaces of the cutting edge portion 16 and the bent portion 13.

[0030] As shown in FIG. 5, in the cutting insert 10 of the present embodiment, a pressed region 14 pressed by the pressing surface 7 of the pressing portion 6 is disposed at the central portion of the concave groove 11. And a protrusion 20 that partially protrudes upward from the bottom surface 11c of the concave groove 11 is provided at a position adjacent to the pressed region 14 on the concave groove 11. The protrusion 20 is located on the side opposite to the bent portion 13 with respect to the pressed region 14. The protrusion 20 is hemispherical. The protrusion 20 is a part of the cutting insert 10 made of a single member. The protrusion 20 is located closer to the tip side (the positive side of the first direction d1) of the main body portion 12 than the central portion in the length direction of the concave groove 11.

[0031] As shown in FIG. 6, a concave groove 21 that extends linearly from the end portion on the negative side of the first direction d1 of the bent portion 13 to the end portion on the positive side of the first direction d1 of the main body portion 12 is provided on the seating surface 15 provided on the lower surface of the cutting insert 10. The concave groove 21 is formed in substantially the same shape as the concave groove 11 formed on the upper surface of the main body portion 12. The concave groove 21 has an inclined surface 21a, an inclined surface 21b, and a bottom surface 21c.

[0032] The cutting insert 10 is attached to the insert mounting seat 8 by inserting the main body portion 12. In a state where the cutting insert 10 is sandwiched between the upper jaw portion 3b and the lower jaw portion 3c, the support protrusion 5a on the pedestal surface 5 fits into the concave groove 21 on the lower surface of the cutting insert 10. Also, the pressing protrusion 7a on the pressing surface 7 fits into the concave groove 11 on the upper surface of the cutting insert 10. With the seating surface 15 of the cutting insert 10 supported from below by the pedestal surface 5 of the insert mounting seat 8, when the clamp screw is tightened, the pressing surface 7 of the pressing portion 6 is pressed against the pressed area 14 of the cutting insert 10. As a result, the cutting insert 10 is fixed in a state of being sandwiched by the upper jaw portion 3b and the lower jaw portion 3c.

[0033] FIG. 7 is a diagram for explaining the action of the protrusion 20 provided on the upper surface of the cutting insert. FIG. 7 is a side view showing an enlarged view near the rear end portion of the pressing protrusion 7a. In the present embodiment, as shown in FIG. 5, a protrusion 20 is provided adjacent to the pressed area 14 where the concave groove 11 and the pressing protrusion 7a are in contact. As shown in the left diagram of FIG. 7, the pressing protrusion 7a is arranged to face the pressed area 14 on the upper surface of the cutting insert 10 in the vertical direction. The protrusion 20 on the upper surface of the cutting insert 10 is arranged to face the lower end portion of the rear end surface 7b of the pressing protrusion 7a in the vertical direction. When the clamp screw 22 is tightened in this state, the pressing protrusion 7a moves downward, and eventually the rear end surface 7b of the pressing protrusion 7a comes into contact with the protrusion 20. When the clamp screw 22 is further tightened from here, as shown in the right diagram of FIG. 7, the rear end surface 7b, which is an inclined surface, pushes the protrusion 20 downward. As a result, a force that pulls the cutting insert 10 toward the rear end side acts on the cutting insert 10. Also, as shown in FIG. 6, the rear end surface of the cutting insert 10 abuts against the rear end support surface 3e facing the front end side within the slit 3a. Therefore, the cutting insert 10 is firmly fixed in the horizontal direction by the pressing protrusion 7a and the rear end support surface 3e.

[0034] According to the cutting edge exchangeable cutting tool 100 of the present embodiment having the above configuration, not only is the cutting insert 10 sandwiched in the vertical direction by the upper jaw portion 3b and the lower jaw portion 3c, but also the pressing projection portion 7a presses the projection portion 20 toward the rear end side, so that the cutting insert 10 is firmly fixed in the horizontal direction as well. Therefore, according to the cutting edge exchangeable cutting tool 100 of the present embodiment, since the cutting insert 10 is firmly fixed to the holder 1, cutting can be stably performed.

[0035] Also, in the profiling process using the cutting edge exchangeable cutting tool 100 of the present embodiment, a groove with a complex shape is formed on the outer peripheral surface or the inner peripheral surface of the workpiece while moving the cutting insert 10 in the front-rear direction F-B shown in FIG. 3. In particular, when the holder 1 is moved toward the rear end side (B direction), a force in the direction of axially pulling out the cutting insert 10 from the holder 1 is applied to the cutting insert 10.

[0036] In the conventional clamp structure of the L-shaped insert, since only the upper and lower surfaces were pressed and fixed, when a force in the direction of pulling out the cutting insert from the insert mounting seat 8 was applied, the cutting insert might deviate from the normal clamping position. On the other hand, in the present embodiment, since the projection portion 20 is provided in the concave groove 11 of the cutting insert 10, even if a pulling force acts on the cutting insert 10 during profiling, the projection portion 20 is caught by the rear end surface 7b of the pressing projection portion 7a, and the position of the cutting insert 10 can be prevented from moving. Therefore, according to the present embodiment, displacement of the cutting insert 10 during machining can be suppressed, and profiling and other complex forms of machining can be stably performed using the L-shaped cutting insert 10.

[0037] (First Modification Example) Hereinafter, with reference to FIGS. 8 and 9, the cutting edge exchangeable cutting tool 100 of the first modification example will be described. FIG. 8 is a perspective view showing the cutting insert 10A of the first modification. FIG. 9 is a partial cross-sectional view of the tip-exchangeable cutting tool 100 including the cutting insert 10A of the first modification. The cutting position of the cross-sectional view in FIG. 9 is the position along the line IV-IV in FIG. 3. In FIGS. 8 and 9, the same reference numerals are assigned to the components common to FIGS. 1 to 7. In the following description, the description of the components similar to those in the previous embodiment will be omitted as appropriate.

[0038] As shown in FIG. 8, the cutting insert 10A of the first modification includes an elongated protrusion 20A on the bottom surface 11c of the concave groove 11. The protrusion 20A is disposed adjacent to the pressed area 14. The protrusion 20A has the largest protrusion height and width on the side of the pressed area 14 (the negative side in the first direction d1), and the protrusion height and width gradually decrease as it moves away from the pressed area 14.

[0039] As shown in FIG. 9, the cutting insert 10A is attached to the insert mounting seat 8 of the holder 1. The pedestal surface 5 of the holder 1 supports the seating surface 15 of the cutting insert 10A from below. The pressing protrusion 7a on the pressing surface 7 of the holder 1 presses the pressed area 14 of the cutting insert 10A from above. The cutting insert 10A is sandwiched and fixed in the vertical direction by the pressing portion 6 and the pedestal portion 4. The rear end surface 7b of the pressing protrusion 7a, which is an inclined surface, presses the protrusion 20A of the cutting insert 10A from above, thereby pushing the cutting insert 10A toward the rear end side. The cutting insert 10A is firmly fixed in the horizontal direction by the pressing protrusion 7a and the rear end support surface 3e of the holder 1. Thus, the cutting insert 10A is fixed to the insert mounting seat 8 of the holder 1.

[0040] In the cutting insert 10A of the first modification example, the protrusion 20A provided on the bottom surface 11c of the concave groove 11 is a linear protrusion extending along the first direction d1. According to this configuration, since the volume of the protrusion 20A is larger than the volume of the protrusion 20 in the previous embodiment and the bottom area of the protrusion 20A is also larger, the protrusion 20A itself has high strength. The rear end surface 7b of the pressing protrusion 7a can push the protrusion 20A with a larger force, and the fixing strength of the cutting insert 10A can be increased. Also, even when a force in the direction of pulling out the cutting insert 10A from the holder 1 is applied during profiling or the like, it is possible to effectively suppress the displacement of the position of the cutting insert 10A.

[0041] Therefore, also in the first modification example, displacement of the position of the cutting insert 10A during machining can be suppressed, and profiling and other complex forms of machining can be stably performed using the L-shaped cutting insert 10A.

[0042] (Second Modification Example) Hereinafter, with reference to FIGS. 10 and 11, the second modification example will be described. FIG. 10 is a perspective view of the cutting insert 10B of the second modification example. FIG. 11 is a partial cross-sectional view of the tool tip exchangeable cutting tool 100 showing the clamped state of the cutting insert 10B of the second modification example. The cutting position of the cross-sectional view in FIG. 11 is the position along the line XI-XI in FIG. 3. In FIGS. 10 and 11, the same reference numerals are given to the components common to FIGS. 1 to 9. In the following description, the description of the components similar to those in the previous embodiment and the first modification example will be omitted as appropriate.

[0043] As shown in FIG. 10, the cutting insert 10B has one protrusion 20B each on the inclined surfaces 11a and 11b of the concave groove 11. The two protrusions 20B are arranged adjacent to the pressed area 14. The two protrusions 20B are hemispherical. The two protrusions 20B can also be linear protrusions similar to the protrusion 20A of the first modification example.

[0044] The cutting insert 10B is attached to the insert mounting seat 8 of the holder 1. The pedestal surface 5 of the holder 1 supports the seating surface 15 of the cutting insert 10B from below. The pressing projection 7a on the pressing surface 7 of the holder 1 presses the pressed area 14 of the cutting insert 10B from above. The cutting insert 10B is clamped and fixed in the vertical direction by the pressing portion 6 and the pedestal portion 4. The rear end surface 7b of the pressing projection 7a, which is an inclined surface, presses the two projections 20B of the cutting insert 10B from above, thereby pushing the cutting insert 10A toward the rear end side. The cutting insert 10B is firmly fixed in the horizontal direction by the pressing projection 7a and the rear end support surface 3e of the holder 1.

[0045] In the cutting insert 10B of the second modification, two projections 20B are provided in the concave groove 11, and as shown in FIG. 11, the rear end surface 7b of the pressing projection 7a contacts the two projections 20B evenly. The rear end surface 7b of the pressing projection 7a can push the projection 20B with a greater force, thereby increasing the fixing strength of the cutting insert 10B. Also, even when a force in the direction of pulling out the cutting insert 10B from the holder 1 is applied during profiling or the like, it is possible to effectively suppress the displacement of the position of the cutting insert 10B. When a force in the pulling-out direction acts on the cutting insert 10B, the two projections 20B are caught by the rear end surface 7b, so that the cutting insert 10B is less likely to tilt.

[0046] Therefore, also in the second modification, it is possible to suppress the displacement of the position of the cutting insert 10B during machining, and using the L-shaped cutting insert 10B, it is possible to stably perform various forms of machining including profiling.

[0047] In the above embodiments and modifications, the protruding portions 20, 20A, and 20B are arranged adjacent to the pressed area 14, but the configuration is not limited to this. In plan view, the protruding portions 20, 20A, and 20B may be arranged at a position slightly separated from the pressed area 14. If the protruding portions 20, 20A, and 20B have a sufficiently large height, the protruding portions 20, 20A, and 20B can be pushed in by the rear end surface 7b of the pressing protrusion 7a, and the cutting inserts 10, 10A, and 10B can be firmly fixed. Also, even when a pulling force in the pulling direction is applied to the cutting inserts 10, 10A, and 10B, displacement of the cutting inserts 10, 10A, and 10B can be suppressed.

Explanation of Reference Numerals

[0048] 1... Holder 2... Shank portion 2b... Upper surface 3... Head portion 3a... Slit 3b... Upper jaw portion 3c... Lower jaw portion 3d... Connection portion 3e... Rear end support surface 4... Base portion 5... Base surface 5a... Support protrusion 6... Pressing portion 7... Pressing surface 7a... Pressing protrusion 7b... Rear end surface 8... Insert mounting seat 10, 10A, 10B... Cutting insert 11, 21... Groove 11a, 21a, 21b... Inclined surface 11c, 21c... Bottom surface 12... Main body portion 12a... Protruding portion 13... Bending portion 14... Pressed area 15... Seating surface 16... Cutting edge portion 17... Cutting edge 18... Relief surface 19... Rake surface 20, 20A, 20B... Protruding portion 22... Clamping screw 100... Tip-exchangeable cutting tool d1... First direction d2... Second direction d3... Third direction

Claims

1. A cutting insert that is held and used in the upper jaw and lower jaw of a holder of a tip-exchangeable cutting tool, comprising: a rod-shaped main body portion extending in a first direction, and a rod-shaped cutting edge portion connected to the main body portion via a bent portion and extending in a second direction different from the first direction; a lower surface on one side of the cutting insert as viewed from a third direction orthogonal to both the first direction and the second direction, which is supported by the lower jaw, and an upper surface on the side opposite to the lower surface, which is supported by the upper jaw; the upper surface has a pressed area pressed by the upper jaw; among the upper surface, in a region adjacent to the pressed area from the side opposite to the bent portion in the first direction, there is a protrusion that partially protrudes upward from the upper surface; Cutting insert.

2. The protrusion is arranged at a position adjacent to the pressed area. The cutting insert according to Claim 1.

3. The upper surface has a concave groove extending along the first direction; The protrusion is located at the bottom surface of the concave groove. The cutting insert according to Claim 1 or 2.

4. The upper surface has a concave groove extending along the first direction; The concave groove has a pair of inclined surfaces arranged in a V shape as viewed from the first direction; The protrusions are respectively arranged on the pair of inclined surfaces. The cutting insert according to Claim 1 or 2.

5. The protrusion is a linear protrusion extending along the first direction. The cutting insert according to Claim 1 or 2.

6. A tip-exchangeable cutting tool comprising the cutting insert according to Claim 1 or 2 and a holder for holding the cutting insert. Tip-exchangeable cutting tool.

Images