Cutting insert and cutting tool

Abstract

The utility model discloses a cutting blade and cutting tool relates to tool technical field, and cutting blade includes: body part, cutting part and spacing structure, body part and cutting part are connected along the first direction arrangement, and cutting part includes rake face and first relief surface, along second direction, the side surface of cutting part is rake face, along the first direction, the surface of cutting part away from body part is first relief surface, and rake face and first relief surface are connected to form the main cutting edge extending along third direction, first direction, second direction and third direction are perpendicular to each other, and spacing structure is fixed in rake face, and spacing structure and main cutting edge are spaced along the first direction, and the surface structure of spacing structure facing main cutting edge is recessed to the surface of body part. According to the cutting blade of the application, it is favorable to realize the effect that the chip is curled along the curved surface, is favorable to improve the chip breaking and the effect of chip removal of cutting blade, is favorable to improve the surface quality and machining precision of workpiece.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a cutting insert and a cutting tool having the cutting insert. Background Technology

[0002] In related technologies, when existing cutting inserts are used for grooving and cutting, the cutting inserts penetrate deep into the workpiece, making chip breaking and removal difficult. This can easily affect the surface quality and machining accuracy of the workpiece, as well as the lifespan of the cutting inserts. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a cutting insert that facilitates guiding chips to curl along curved surfaces, reduces the probability of long, thin chips entangled in the workpiece or cutting tool, improves the chip breaking and removal effect of the cutting insert, reduces the cutting resistance of the cutting insert, and improves the surface quality and machining accuracy of the workpiece.

[0004] This utility model also proposes a cutting tool using the above-mentioned cutting insert.

[0005] A cutting insert according to a first aspect of the present invention includes: a body portion, a cutting portion, and a limiting structure. The body portion and the cutting portion are arranged and connected along a first direction. The cutting portion includes a rake face and a first flank face. Along a second direction, one side surface of the cutting portion is the rake face. Along the first direction, the surface of the cutting portion facing away from the body portion is the first flank face. The rake face and the first flank face are connected to form a main cutting edge extending along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The limiting structure is fixed to the rake face. The limiting structure and the main cutting edge are spaced apart along the first direction. Along the first direction, the surface of the limiting structure facing the main cutting edge is constructed as a curved surface concave towards the body portion.

[0006] According to the embodiments of this application, the cutting insert, by providing a limiting structure fixed on the rake face, facilitates the effect of guiding the chips to curl along the curved surface. The chips can naturally form regular short curls or spirals, which are easier to discharge from the cutting area. This helps reduce the probability of long, strip-shaped chips entangled in the workpiece or cutting tool, reduces the probability of chip deviation and jamming, improves the reliability and stability of chip removal by the cutting insert, enhances the chip breaking and removal effect of the cutting insert, reduces the cutting resistance of the cutting insert, improves the surface quality and machining accuracy of the workpiece, and extends the service life of the cutting insert.

[0007] According to some embodiments of the present invention, the curved surface includes a first surface and a second surface, and the first surface and the second surface are arranged along the third direction.

[0008] According to some embodiments of the present invention, the cutting portion has a midline extending along the first direction, and the first surface and the second surface are symmetrical about the midline.

[0009] According to some embodiments of the present invention, the curved surface further includes a recessed area that is recessed into the limiting structure to form a heat dissipation space, and the recessed area is connected between the first surface and the second surface.

[0010] According to some embodiments of the present invention, from one end of the limiting structure facing the rake face to the other end of the limiting structure away from the rake face, the curved surface is inclined in a direction away from the main cutting edge.

[0011] According to some embodiments of the present invention, along the third direction, both sides of the curved surface have curved side edges, and the end of the curved side edge facing the rake face has a first protrusion connected to the rake face.

[0012] According to some embodiments of the present invention, along the second direction, the main cutting edge is located on the side of the first protrusion opposite to the rake face.

[0013] According to some embodiments of the present invention, along the second direction, the curved surface has a curved end edge that is opposite to the rake face, the curved end edge is connected between two curved side edges, and the main cutting edge is located between the first protrusion and the curved end edge.

[0014] According to some embodiments of this utility model, the distance between the connection point of the curved end edge and the curved side edge and the main cutting edge along the first direction is L1, which satisfies the relationship: 0.5mm≤L1≤2mm.

[0015] According to some embodiments of this utility model, the distance between the connection point of the curved end edge and the two curved side edges along the third direction is L2, which satisfies the relationship: 1.5mm≤L2≤3mm.

[0016] The cutting tool according to a second aspect of the present invention includes the cutting insert described in the above embodiments.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a cutting blade according to an embodiment of this application; Figure 2 This is a top view of a cutting blade according to an embodiment of this application; Figure 3 This is a side view of a cutting blade according to an embodiment of this application.

[0019] Figure label: Cutting blade 1, Cutting section 10, rake face 11, first flank face 12, main cutting edge 13, second flank face 14, secondary cutting edge 15, tool tip 16, first edge 17. Body part 20, The limiting structure 30 includes a first surface 31, a second surface 32, a recessed area 33, a curved side edge 34, a first protrusion 341, and a curved end edge 35. Chip space 40. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] The following is for reference. Figures 1-3 The cutting insert 1 according to an embodiment of the present invention can be mounted on a cutting tool.

[0022] According to the first aspect of the present invention, the cutting blade 1, such as Figures 1-3 As shown, the cutting insert 1 may include: a body portion 20, a cutting portion 10, and a limiting structure 30. The body portion 20 and the cutting portion 10 are arranged and connected along a first direction. The cutting portion 10 includes a rake face 11 and a first flank face 12. Along a second direction, one side surface of the cutting portion 10 is the rake face 11. Along the first direction, the surface of the cutting portion 10 facing away from the body portion 20 is the first flank face 12. The rake face 11 and the first flank face 12 are connected to form a main cutting edge 13 extending along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The limiting structure 30 is fixed to the rake face 11. The limiting structure 30 and the main cutting edge 13 are spaced apart along the first direction. Along the first direction, the surface of the limiting structure 30 facing the main cutting edge 13 is constructed as a curved surface recessed towards the body portion 20.

[0023] It should be noted that when existing cutting inserts are used for grooving and cutting, the cutting inserts penetrate deep into the workpiece, making chip breaking and removal difficult. This can easily affect the surface quality and machining accuracy of the workpiece, as well as the lifespan of the cutting inserts.

[0024] Based on this, this application provides a cutting blade 1, wherein the body portion 20 and the cutting portion 10 can be arranged along a first direction, the body portion 20 and the cutting portion 10 can be connected, and the body portion 20 and the cutting portion 10 can be integrally formed. When the cutting blade 1 is as Figure 1 When setting the direction, the first direction is Figure 1 In the X direction. The cutting part 10 may include a rake face 11 and a first flank face 12. Along the second direction, one side surface of the cutting part 10 is the rake face 11. When the cutting insert 1 is as follows... Figure 1 When setting the direction, the second direction is Figure 1 In the Z-direction, the first direction and the second direction are perpendicular. When the cutting insert 1 is placed in the vertical direction, the rake face 11 can be located on the upper side of the cutting insert 1. The rake face 11 can be connected to the first flank face 12 to form the main cutting edge 13, which can extend along the third direction. Figure 1 When setting the direction, the third direction is... Figure 1 In the Y direction, the first direction, the second direction, and the third direction are perpendicular to each other.

[0025] From the cutting section 10 to the body section 20, the rake face 11 is inclined, and the rake face 11 can guide the chips to flow along the inclined direction of the rake face 11. The limiting structure 30 can be fixed to the rake face 11, and the limiting structure 30 can be integrally formed with the cutting section 10. The limiting structure 30 and the main cutting edge 13 can be spaced apart along the first direction, and along the first direction, the surface of the limiting structure 30 facing the main cutting edge 13 can be constructed as a curved surface, and the curved surface can be recessed towards the body section 20. When the cutting insert 1 is used to cut the workpiece, the chips can flow along the rake face 11, and the chips can flow to the limiting structure 30. The curved surface of the limiting structure 30 facing the main cutting edge 13 can guide the chips, which is beneficial to achieving the effect of guiding the chips to curl naturally along the curved surface, which is beneficial to achieving the effect of curling long strip chips, which is beneficial to reducing the probability of long strip chips wrapping around the workpiece or cutting tool, and which is beneficial to improving the chip removal effect of the cutting insert 1.

[0026] In this embodiment, by providing a limiting structure 30 fixed on the rake face 11, it is beneficial to guide the chips to curl along the curved surface. The chips can naturally form regular short curls or spirals, which are easier to discharge from the cutting area. This helps reduce the probability of long, strip-shaped chips wrapping around the workpiece or cutting tool, reduces the probability of chip deviation and jamming, improves the reliability and stability of chip removal by the cutting insert 1, enhances the chip breaking and removal effect of the cutting insert 1, reduces the cutting resistance of the cutting insert 1, improves the surface quality and machining accuracy of the workpiece, and extends the service life of the cutting insert 1.

[0027] As an example, there can be two cutting parts 10, which can be arranged opposite each other along a first direction, and the body part 20 can be connected between the two cutting parts 10. When one of the cutting parts 10 is damaged, the setting direction of the cutting insert 1 can be changed, that is, the other cutting part 10 can be used instead, which helps to further extend the service life of the cutting insert 1 and reduce the cost of the cutting tool.

[0028] As an example, the cutting section 10 may further include a second flank face 14, which is connected to the rake face 11 to form a secondary cutting edge 15. The secondary cutting edge 15 may extend along the edge extension direction of the rake face 11. There may be two second flank faces 14, which may be opposite each other in a third direction, and a first flank face 12 may be connected between the two second flank faces 14. There may be two secondary cutting edges 15, both of which may be connected to the main cutting edge 13. When the cutting insert 1 is used for grooving, the secondary cutting edges 15 may be used to machine the sidewalls of the groove.

[0029] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the curved surface includes a first surface 31 and a second surface 32, which are arranged along a third direction.

[0030] The curved surface includes a first surface 31 and a second surface 32. The first surface 31 can be constructed as a plane or a curved surface, and the second surface 32 can also be constructed as a plane or a curved surface. In this embodiment, the first surface 31 and the second surface 32 are constructed as a plane for illustration. The first surface 31 and the second surface 32 can be arranged along a third direction. The first surface 31 and the second surface 32 can be spaced apart, or the first surface 31 and the second surface 32 can be connected. An included angle can be formed between the first surface 31 and the second surface 32, and the included angle can be an obtuse angle or a right angle. When the chips flow to the limiting structure 30, the chips can abut against both the first surface 31 and the second surface 32. The first surface 31 and the second surface 32 can provide constraints on the chips along the third direction. Both the first surface 31 and the second surface 32 can apply force to the chips, which is beneficial to curling the chips along the two sides of the third direction. This is beneficial to further achieve the effect of curling the chips, further reducing the probability of chip deviation and jamming, further improving the chip breaking and chip removal effect of the cutting insert 1, and the flat surface is easier to process, which is beneficial to reduce the processing difficulty and cost of the cutting insert 1.

[0031] In some embodiments of the present invention, the cutting portion 10 has a midline extending along a first direction, and the first surface 31 and the second surface 32 are symmetrical about the midline.

[0032] The cutting section 10 has a center line extending along a first direction. The center line and the two ends of the cutting section 10 along a third direction are equally spaced. The first surface 31 and the second surface 32 can be symmetrical about the center line. By setting the first surface 31 and the second surface 32 to be symmetrical about the center line, it is beneficial to make the forces exerted by the first surface 31 and the second surface 32 on the chips equal, which is beneficial to further reduce the probability of chip deviation and jamming, to make the cutting force uniformly distributed, and to further extend the service life of the cutting insert 1 and the cutting tool.

[0033] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the curved surface also includes a recessed area 33 recessed into the limiting structure 30 to form a heat dissipation space, and the recessed area 33 is connected between the first surface 31 and the second surface 32.

[0034] The curved surface may also include a recessed area 33, which can be recessed into the limiting structure 30. The recessed area 33 can form a heat dissipation space and can be connected between the first surface 31 and the second surface 32. The first surface 31 and the second surface 32 can be symmetrically arranged about the recessed area 33. By setting the recessed area 33, it is beneficial to increase the contact area between the cutting part 10 and the air, which is beneficial to accelerate the heat dissipation efficiency of the cutting tool 1. Furthermore, the recessed area 33 is located on the curved surface, which is beneficial to reduce the contact area between the chip and the curved surface, which is beneficial to reduce the cutting heat of the cutting tool 1. It is also beneficial to reduce the friction between the chip and the limiting structure 30, which is beneficial to make the chip curl more smoothly along the curved surface, which is beneficial to reduce the impact force when the chip curls, thereby reducing the pressure of the chip on the limiting structure 30, and further extending the service life of the cutting tool 1.

[0035] In some embodiments of this utility model, such as Figure 1 As shown, from one end of the limiting structure 30 facing the rake face 11 to the other end of the limiting structure 30 away from the rake face 11, the curved surface is inclined in the direction away from the main cutting edge 13.

[0036] From one end of the limiting structure 30 facing the rake face 11 to the other end of the limiting structure 30 away from the rake face 11, the curved surface can be inclined away from the main cutting edge 13. The inclination direction of the curved surface can be adapted to the flow trajectory of the chips, which is beneficial to the smooth removal of chips from the cutting area, reducing the probability of chips being stuck or scraping back onto the workpiece surface, further improving the machining accuracy of the workpiece, further reducing cutting resistance, improving the stability of the cutting insert 1 when machining the workpiece, and reducing the probability of chips hitting other parts of the tool when being discharged, thus further extending the service life of the cutting insert 1.

[0037] In some embodiments of this utility model, such as Figure 2 As shown, along the third direction, both sides of the curved surface have curved side edges 34, and the end of the curved side edge 34 facing the front cutting surface 11 has a first protrusion 341 connected to the front cutting surface 11.

[0038] Along the third direction, both sides of the curved surface may have curved side edges 34, and the two curved side edges 34 may be arranged opposite each other along the third direction, extending to the rake face 11. The end of the curved side edge 34 facing the rake face 11 may have a first protrusion 341, which may be connected to the rake face 11. Along the second direction, the first protrusion 341 may protrude from the rake face 11. When the chip flows along the rake face 11 to the limiting structure 30, the chip will flow through the first protrusion 341, which can compress the chip, causing local stress concentration. This can disrupt the continuity of the internal fibers of the chip, making it easier to break by creating microcracks, improving the chip's brittleness, shortening the time for the chip to curl and break into short chips, further reducing the probability of the chip wrapping around the workpiece or cutting tool, and further improving the chip breaking and chip removal effect of the cutting insert 1.

[0039] In some embodiments of this utility model, such as Figures 1-3 As shown, along the second direction, the main cutting edge 13 is located on the side of the first protrusion 341 that is away from the rake face 11.

[0040] Along the second direction, the main cutting edge 13 can be located on the side of the first protrusion 341 opposite to the rake face 11. This helps reduce the impact of the first protrusion 341 on the cutting effect of the main cutting edge 13 on the workpiece, reduces the probability of affecting chip formation, and improves the reliability of the cutting insert 1. When the cutting insert 1 is used to machine a workpiece, the main cutting edge 13 can contact the workpiece for cutting, while the first protrusion 341 will not touch the workpiece surface. The first protrusion 341 only contacts the chip after chip formation and increases its brittleness. This helps reduce the probability of the first protrusion 341 scratching the workpiece or affecting the cutting depth, further improves the machining accuracy of the workpiece, reduces wear and impact damage to the first protrusion 341, and further extends the service life of the cutting insert 1. Furthermore, it can also form a reasonable chip channel between the main cutting edge 13 and the first protrusion 341, allowing the chips to flow naturally to the first protrusion 341. This helps to increase the chip brittleness of the first protrusion 341 while reducing the probability of chips getting stuck between the main cutting edge 13 and the first protrusion 341, which is beneficial to further improve the chip breaking and chip removal effect of the cutting insert 1.

[0041] In some embodiments of this utility model, such as Figures 1-3 As shown, along the second direction, the curved surface has a curved end edge 35 that is away from the front face 11. The curved end edge 35 is connected between two curved side edges 34, and the main cutting edge 13 is located between the first protrusion 341 and the curved end edge 35.

[0042] Along the second direction, the curved surface has a curved end edge 35 facing away from the rake face 11. The curved end edge 35 can be connected between two curved side edges 34. The main cutting edge 13 can be located between the first protrusion 341 and the curved end edge 35. That is, along the second direction, the first protrusion 341 can be located on the side of the main cutting edge 13 facing away from the curved end edge 35. This facilitates the formation of a curved chip removal channel in the cutting insert 1, and helps guide the chips to be smoothly discharged along the curved end edge 35. By setting the main cutting edge 13 between the first protrusion 341 and the curved end edge 35, it is beneficial for the chips to be smoothly curled during the flow from the main cutting edge 13 to the curved end edge 35, and discharged from the cutting area from the curved end edge 35. This further improves the smoothness of chip flow and further improves the chip breaking and chip removal effect of the cutting insert 1.

[0043] As an example, the connection between the main cutting edge 13 and the secondary cutting edge 15 can be constructed as a tool tip 16, and a first edge 17 can be connected between the tool tip 16 and the corresponding first protrusion 341. The two first edges 17, the main cutting edge 13, the rake face 11 and the surface of the limiting structure 30 facing the main cutting edge 13 can jointly define a chip space 40, in which the chips can curl.

[0044] In some embodiments of this utility model, such as Figure 2 As shown, the distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 along the first direction is L1, which satisfies the relationship: 0.5mm≤L1≤2mm.

[0045] For example, the distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 along the first direction can be 0.5mm, 0.9mm, 1.2mm, 1.7mm, 2mm, etc. The distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 along the first direction can be within 0.5mm to 2mm. Any value, including the endpoint value, is an optional distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 along the first direction. If the distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 along the first direction is less than 0.5mm, the distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 is too small, affecting chip formation and preventing the chips from curling smoothly, thus affecting the chip removal effect of the cutting insert 1. If the distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 along the first direction is greater than 2mm, then the distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 is too large. After the chip is formed, it needs to flow a long distance to contact the surface of the limiting structure 30 facing the main cutting edge 13, making it difficult for the chip to curl and affecting the chip removal and chip breaking effect of the cutting insert 1. Therefore, the distance between the connection point of the curved end edge 35 and the curved side edge 34 and the main cutting edge 13 along the first direction is within 0.5mm to 2mm, which is conducive to the smooth formation of the chip, the smooth curling of the chip, and further improves the chip breaking and chip removal effect of the cutting insert 1.

[0046] In some embodiments of this utility model, such as Figure 2 As shown, the distance between the connection point of the curved end edge 35 and the two curved side edges 34 along the third direction is L2, which satisfies the relationship: 1.5mm≤L2≤3mm.

[0047] For example, the distance between the connection points of the curved end edge 35 and the two curved side edges 34 along the third direction can be 1.5mm, 1.9mm, 2.3mm, 2.8mm, 3mm, etc. The distance between the connection points of the curved end edge 35 and the two curved side edges 34 along the third direction can be within the range of 1.5mm to 3mm. Any value, including the endpoint value, is an optional distance between the connection points of the curved end edge 35 and the two curved side edges 34 along the third direction in this utility model. If the distance between the connection points of the curved end edge 35 and the two curved side edges 34 along the third direction is less than 1.5mm, then the distance between the connection points of the curved end edge 35 and the two curved side edges 34 along the third direction is small, and the width of the chip space 40 along the third direction is too small, affecting the heat dissipation effect of the cutting blade 1 during chip removal and affecting the efficiency of chip formation and curling. If the distance between the connection points of the curved end edge 35 and the two curved side edges 34 along the third direction is greater than 3mm, then the excessive distance will affect the chip curling effect and the chip breaking and removal effect of the cutting insert 1. Therefore, the distance between the connection points of the curved end edge 35 and the two curved side edges 34 along the third direction should be within 1.5mm to 3mm. This will help the cutting insert 1 to dissipate heat better during cutting, improve the efficiency of chip formation and curling, and further improve the chip breaking and removal effect of the cutting insert 1.

[0048] As an example, along the second direction, the distance between the connection point of the curved end edge 35 and the two curved side edges 34 and the main cutting edge 13 is H1, and the distance between the first protrusion 341 and the main cutting edge 13 is H2, satisfying the relationship: H1 > H2. The distance between the connection point of the curved end edge 35 and the two curved side edges 34 and the main cutting edge 13 can be greater than the distance between the first protrusion 341 and the main cutting edge 13, which is beneficial for better chip curling and further improves the chip breaking and chip removal effect of the cutting insert 1.

[0049] The cutting tool according to the second aspect of the present invention includes the cutting insert 1 in the above embodiment.

[0050] According to the embodiments of this application, using the cutting insert 1 in the above embodiments is beneficial to extending the service life of the cutting tool and improving the surface quality and machining accuracy of the workpiece.

[0051] Other components and operations of the cutting insert 1 and cutting tool according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cutting blade, characterized in that, include: The body (20) and the cutting part (10) are arranged and connected along a first direction. The cutting part (10) includes a rake face (11) and a first flank face (12). Along a second direction, one side surface of the cutting part (10) is the rake face (11). Along the first direction, the surface of the cutting part (10) facing away from the body (20) is the first flank face (12). The rake face (11) and the first flank face (12) are connected to form a main cutting edge (13) extending along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. A limiting structure (30) is fixed to the rake face (11). The limiting structure (30) and the main cutting edge (13) are spaced apart along the first direction. Along the first direction, the surface of the limiting structure (30) facing the main cutting edge (13) is constructed as a curved surface that is recessed toward the body portion (20).

2. The cutting blade according to claim 1, characterized in that, The curved surface includes a first surface (31) and a second surface (32), which are arranged along the third direction.

3. The cutting blade according to claim 2, characterized in that, Along the third direction, the cutting portion (10) has a median line extending along the first direction, and the first surface (31) and the second surface (32) are symmetrical about the median line.

4. The cutting blade according to claim 2, characterized in that, The curved surface also includes a recessed area (33) recessed into the limiting structure (30) to form a heat dissipation space, the recessed area (33) being connected between the first surface (31) and the second surface (32).

5. The cutting blade according to claim 1, characterized in that, From one end of the limiting structure (30) facing the rake face (11) to the other end of the limiting structure (30) away from the rake face (11), the curved surface is inclined away from the main cutting edge (13).

6. The cutting insert according to any one of claims 1-5, characterized in that, Along the third direction, both sides of the curved surface have curved side edges (34), and the end of the curved side edge (34) facing the rake face (11) has a first protrusion (341) connected to the rake face (11).

7. The cutting blade according to claim 6, characterized in that, Along the second direction, the main cutting edge (13) is located on the side of the first protrusion (341) away from the rake face (11).

8. The cutting blade according to claim 6, characterized in that, Along the second direction, the curved surface has a curved end edge (35) opposite to the rake face (11), the curved end edge (35) is connected between the two curved side edges (34), and the main cutting edge (13) is located between the first protrusion (341) and the curved end edge (35).

9. The cutting blade according to claim 8, characterized in that, The distance between the connection point of the curved end edge (35) and the curved side edge (34) and the main cutting edge (13) along the first direction is L1, which satisfies the relationship: 0.5mm≤L1≤2mm.

10. The cutting blade according to claim 8, characterized in that, The distance between the connection points of the curved end edge (35) and the two curved side edges (34) along the third direction is L2, which satisfies the relationship: 1.5mm≤L2≤3mm.

11. A cutting tool, characterized in that, Includes the cutting blade (1) according to any one of claims 1-10.

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