Cutting insert

Abstract

A cutting insert is provided. The cutting insert comprises a front end face, a side face, a surface, a front cutting edge and a side cutting edge which are located at the front end of the cutting insert. The upper surface comprises a first front angle face, a second front angle face, a bottom face and a boss. The first rake face is connected with the side cutting edge, and the first rake face is inclined downwards. The second rake face is connected to the first rake face, and the second rake face is inclined downward relative to the first rake face. And one side of the bottom surface is connected with the other side of the second front angle surface. The boss is arranged on the other side of the bottom face, and the side wall of the side, facing the second front angle face, of the boss is an inclined face. And the second front angle surface, the bottom surface and the inclined surface form a chip breaker groove. The inclined surface is provided with a convex part and a concave part towards the second front angle surface, the convex part is convex towards the outer side of the boss, the concave part is concave towards the inner side of the boss, and the convex part and the concave part are adjacently arranged, so that the inclined surface is wavy. The cutting blade can reduce the cutting resistance of cuttings, and enables the cuttings to be easy to curl and to be discharged smoothly.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a cutting blade. Background Art

[0002] In a conventional cutting insert, a chip breaker groove and a boss are provided on the upper surface of the cutting insert, and the chips are discharged sequentially along the chip breaker groove from the cutting edge of the insert. As described in patent CN104439317B, during processing, the chips will be curled when passing through the bottom surface of the chip breaker groove and the side surface of the boss.

[0003] When semi-finishing or roughing steel, cast iron and other materials, the chips are relatively wide and thick, and when they pass through the chip breaker, they come into contact with the surface of the boss, causing curling. However, due to the large width and thickness of the chips, it is difficult for the chips to curl; therefore, when the chips come into contact with the surface of the boss, they are squeezed and deformed, and during the curling process, a relatively large friction resistance is generated, that is, the cutting resistance of the chips is large, which is not conducive to the discharge of the chips. Summary of the invention

[0004] An object of the present invention is to provide a cutting insert which can reduce the cutting resistance of chips and make the chips easily curled and discharged smoothly.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A cutting blade, comprising a front end face located at the front end of the cutting blade, side faces connected to both sides of the front end face, an upper surface connected to the front end face and the two side faces, a front cutting edge at the intersection of the front end face and the upper surface, and a side cutting edge located at the intersection of the side faces and the upper surface;

[0007] The upper surface comprises:

[0008] A first front angle surface, one side of which is connected to the side cutting edge, and the first front angle surface is inclined downward;

[0009] A second front angle surface, one side of the second front angle surface is connected to the other side of the first front angle surface, and the second front angle surface is inclined downward relative to the first front angle surface;

[0010] a bottom surface, one side of the bottom surface being connected to the other side of the second front angle surface;

[0011] A boss is arranged on the other side of the bottom surface, and the side wall of the boss facing the second front angle surface is a slope. The second front angle surface, the bottom surface and the slope form a chip breaker groove. The slope is provided with a protrusion and a recessed portion toward the second front angle surface. The protrusion protrudes toward the outside of the boss, and the recessed portion is recessed toward the inside of the boss. The protrusion and the recessed portion are adjacent to each other so that the slope is wavy.

[0012] In one embodiment, the boss includes a plurality of protrusions, and the distances between the plurality of protrusions and the side cutting edges gradually increase in a direction away from the front cutting edge.

[0013] In one embodiment, in a direction away from the front cutting edge, the protrusions are sequentially a first protrusion, a second protrusion and a third protrusion, and the first protrusion is located at an end portion of the inclined surface close to the front cutting edge.

[0014] In one embodiment, a distance between the first protrusion and the second protrusion is smaller than a distance between the second protrusion and the third protrusion.

[0015] In one embodiment, the first protrusion and the third protrusion are located on the same reference line, the second protrusion protrudes from the reference line, and the second protrusion is closer to the side cutting edge relative to the reference line.

[0016] In one embodiment, in the thickness direction of the cutting insert, the height of the boss is higher than the height of the side cutting edge.

[0017] In one embodiment, the bottom surface is provided with a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the extension direction of the side cutting edge.

[0018] In one embodiment, the distances between the plurality of protrusions and the side cutting edge are the same.

[0019] In one embodiment, in the thickness direction of the cutting blade, the height of the protrusion is equal to or lower than the height of the side cutting edge, the height of the protrusion is lower than the height of the boss, and the height of the boss is higher than the height of the side cutting edge.

[0020] In one embodiment, the surface of the protrusion is a spherical surface.

[0021] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects: in the cutting tool of the present invention, since the inclined surface of the boss is provided with a protruding portion and a recessed portion, the protruding portion can prevent the chips from contacting the entire inclined surface of the boss, and the chips only need to make point contact with the protruding portion, which can reduce the friction between the chips and the inclined surface, so that the chips can be smoothly curled, broken and discharged.

[0022] In addition, the recessed portion of the inclined surface can increase the space of the chip breaker groove, increase the movement space of the chips, and facilitate the smooth curling and discharge of the chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of a cutting insert according to the present embodiment;

[0024] Figure 2 is a schematic diagram of a workpiece processed by a cutting insert according to the present embodiment;

[0025] Figure 3 yes Figure 1 A top view of the cutting insert is shown;

[0026] Figure 4 yes Figure 3 A cross-sectional view of the cutting insert along AA is shown;

[0027] Figure 5 yes Figure 3 A cross-sectional view of the cutting insert along BB is shown;

[0028] Figure 6 yes Figure 3 A cross-sectional view of the cutting insert along CC is shown;

[0029] Figure 7 yes Figure 3 A partial enlarged view of the cutting blade shown;

[0030] Figure 8 Is the chip in Figure 1 The movement trajectory of the cutting blade is shown.

[0031] The following are the descriptions of the reference numerals:

[0032] 10. Cutting blades;

[0033] 1. Main body; 11. Mounting hole;

[0034] 2. Cutting portion; 21. Front end face; 22. Side face; 23. Upper surface; 231. First front angle face; 232. Second front angle face; 233. Bottom face; 24. Front cutting edge; 241. First front region; 242. Second front region; 25. Side cutting edge; 26. Boss; 261. Inclined surface; 262. Raised portion; 2621. First raised portion; 2622. Second raised portion; 2623. Third raised portion; 263. Recessed portion; 264. Extension portion; 27. Chip breaker groove; 28. Protrusion. DETAILED DESCRIPTION

[0035] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] See also Figure 1 , the present application provides a cutting blade 10. The cutting blade 10 can be used for cutting workpieces. Specifically, the cutting blade 10 of the present embodiment can be applied to semi-finishing and rough machining of materials such as steel and cast iron, especially in rough machining and other applications, where the cutting resistance encountered by the blade will be relatively large. The cutting blade 10 of the present embodiment can better ensure that the blade has sufficient strength to handle the chips generated by the above-mentioned materials with higher hardness, and has sufficient chip removal space to facilitate chip discharge. It can be understood that the cutting blade 10 of the present embodiment can also process materials with higher hardness. The workpiece material of the cutting blade 10 is not limited here. The cutting blade 10 is roughly rhombus-shaped. That is, the long axis direction of the cutting blade 10 is the front-to-back direction. As Figure 1 As shown, the cutting blade 10 of this embodiment extends from the front end side (lower left side in the figure) toward the rear end side (upper right side in the figure) along the central axis. That is, the front-to-back direction is from the lower left to the upper right direction in the figure. In addition, the thickness direction of the cutting blade is the vertical direction, that is, the up-down direction shown in the figure. The left-right direction is from the upper left to the lower right direction in the figure.

[0038] The cutting insert 10 of this embodiment has a main body 1 and two cutting parts 2 along the central axis. The two cutting parts 2 are respectively located on both sides of the main body 1. It can be understood that the cutting insert can also have three, four or other multiple cutting parts, and the cutting insert can also be configured in other shapes, such as triangles, squares, regular polygons, etc.

[0039] See also Figure 2 The main body 1 is used for fixing and mounting with a tool handle (not shown). The main body 1 is provided with a mounting hole 11, and the mounting hole 11 is used for connecting with the tool handle to drive the cutting blade 10 to perform cutting processing.

[0040] The two cutting parts 2 are respectively located on both sides of the main body 1. The two cutting parts 2 are roughly triangular. When the cutting part 2 on one side is worn out during the cutting process, the cutting part 2 on the other side can be replaced for cutting. The two cutting parts 2 can be the same embodiment or two different embodiments. Specifically in the present embodiment, the two cutting parts 2 are symmetrically arranged about the short axis of the cutting blade 10.

[0041] In other embodiments, the rhombus-shaped cutting blade may also have four cutting parts. Then the front and rear cutting parts are symmetrically arranged about the short axis of the cutting blade 10 , and the left and right cutting parts are symmetrically arranged about the long axis of the cutting blade 10 .

[0042] See also Figure 1 Each cutting portion 2 can also be symmetrically arranged about the long axis of the cutting blade 10 to ensure that the strength of both sides of the cutting portion 2 is consistent and the force is evenly applied. Specifically, the cutting portion 2 includes a front end face 21, a side face 22, an upper surface 23, a front cutting edge 24 and a side cutting edge 25.

[0043] The front end surface 21 is located at the front end of the cutting portion 2. The front end surface 21 may be a partial cylindrical surface.

[0044] The side surfaces 22 are connected to both sides of the front end surface 21. The side surfaces 22 may be planes. The extending directions of the two side surfaces 22 are arranged at a certain angle. Specifically, the angle between the two side surfaces 22 is less than 90 degrees. The front end surface 21 is located at the connection between the two side surfaces 22, and forms a smooth transition to maintain continuity.

[0045] The upper surface 23 is connected to the front end face 21 and the two side faces 22. The intersection of the front end face 21 and the upper surface 23 forms a front cutting edge 24, and the intersection of the side faces 22 and the upper surface 23 forms a side cutting edge 25. The front cutting edge 24 is a rounded cutting edge. The rounded cutting edge can make the front cutting edge 24 and the side cutting edge 25 transition smoothly and maintain continuity. The front cutting edge 24 can be used for longitudinal processing of the cylindrical end face and axial processing in the direction of the cylindrical axis. The side cutting edge 25 can be a straight cutting edge.

[0046] Specifically in the present embodiment, the upper surface 23 includes a first rake face 231 and a second rake face 232. The first rake face 231 is located at the outermost side of the upper surface 23. One side of the first rake face 231 is connected to the side cutting edge 25, and the first rake face 231 is inclined downward. Specifically, in the cross section along the vertical direction, the width of the first rake face 231 is 0.15mm to 0.25mm. And the width of the first rake face 231 is about 0.2mm. And the angle between the first rake face 231 and the horizontal plane can be 2° to 8°. Specifically in the present embodiment, the angle between the first rake face 231 and the horizontal plane is 5°. The first rake face 231 is inclined relative to the horizontal plane, which can ensure the overall strength of the side cutting edge 25, especially when performing rough processing with large feed and large cutting depth, it can ensure that the side cutting edge 25 is not prone to breakage.

[0047] One side of the second rake face 232 is connected to the side of the first rake face 231 away from the side cutting edge 25. The second rake face 232 is inclined downward relative to the first rake face 231. The second rake face 232 can be connected to the first rake face 231 through a smooth transition surface. Therefore, when the chips move from the first rake face 231 to the second rake face 232, since the second rake face 232 is more inclined downward, the space corresponding to the second rake face 232 is larger, which is more conducive to the curling of the chips, so that the chips can be discharged smoothly.

[0048] Furthermore, the angle between the second rake face 232 and the horizontal plane can be 10° to 30°. Specifically, in the present embodiment, the angle between the second rake face 232 and the horizontal plane is 20°. Furthermore, the second rake face 232 is more inclined downward relative to the first rake face 231. Furthermore, the arrangement of the first rake face 231 and the second rake face 232 can ensure the strength of the side cutting edge 25 and the overall rigidity of the cutting insert 10.

[0049] Furthermore, the upper surface 23 further includes a first front region 241 connected to the front cutting edge 24 and a second front region 242 connected to the first front region 241. Furthermore, the first front region 241 is inclined downward, and the degree of inclination of the first front region 241 may be the same as the degree of inclination of the first front angle surface 231. The second front region 242 extends rearward, and the second front region 242 is more inclined downward relative to the first front region 241. The degree of inclination of the second front region 242 may be the same as the degree of inclination of the second front angle surface 232.

[0050] The first front angle surfaces 231 on the left and right sides are connected by the first front area 241, so that the two first front angle surfaces 231 on the left and right sides are smoothly transitioned and connected. In addition, the second front angle surfaces 232 on the left and right sides are connected by the second front area 242, so that the two second front angle surfaces 232 on the left and right sides are smoothly and smoothly connected.

[0051] Therefore, the edge of the upper surface 23 is designed to include two sections of rake faces or a combination of multiple sections of rake faces, which can ensure that the side cutting edge 25 of the cutting blade 10 has a strong strength and is conducive to chip curling.

[0052] The upper surface 23 also includes a bottom surface 233. One side of the bottom surface 233 is connected to the side of the second front angle surface 232 away from the first front angle surface 231. The bottom surface 233 may be a plane. Moreover, the bottom surface 233 and the second front angle surface 232 may be smoothly connected via a transition surface. The upper surface 23 of the cutting portion 2 is also provided with a boss 26. The boss 26 may be roughly triangular in shape, which matches the shape of the cutting portion 2. The boss 26 is provided on the side of the bottom surface 233 away from the second front angle surface 232. The side wall of the boss 26 facing the second front angle surface 232 is a slope 261. The second front angle surface 232, the bottom surface 233 and the slope 261 form a chip breaker groove 27. Moreover, a transition surface may be provided between the bottom surface 233 and the slope 261, so that the bottom surface 233 and the slope 261 can be transitionally connected. Therefore, the second front angle surface 232 and the bottom surface 233 , as well as the bottom surface 233 and the inclined surface 261 can maintain smooth connection, so that the chips can be smoothly curled and discharged through the chip breaker groove 27 .

[0053] The height of the boss 26 is higher than the height of the side cutting edge 25. The boss 26 is mainly used to curl the chips to a greater extent, thereby making the chips bend and break, and be discharged smoothly. The height setting of the boss 26 is relatively important. If the height of the boss 26 is too low, it will not be conducive to the curling of the chips; if the height of the boss 26 is too high, although it can easily make the chips curl and break, it will hinder the discharge of the chips. Specifically in this embodiment, the height range of the boss 26 is 0.2mm to 0.4mm, and the height of the boss 26 in this embodiment can be 0.3mm. Therefore, the design height of the boss 26 in this embodiment can make the chips curl to a greater extent, and can also make the chips bend and break, and be discharged smoothly.

[0054] See also Figure 1 The chip breaker groove 27 extends along the extension direction of the side cutting edge 25. The bottom surface 233 is provided with a plurality of convex points 28. The surface of the convex point 28 can be a spherical surface. The spherical arc surface of the convex point 28 can maintain point contact with the chips as much as possible, reduce the contact area, and reduce the friction resistance of the chips during the discharge process.

[0055] The plurality of convex points 28 are arranged in sequence along a straight line at intervals. Specifically, the plurality of convex points 28 are arranged at intervals along the extending direction of the side cutting edge 25. The convex points 28 can be distributed at equal intervals.

[0056] It is understood that in other embodiments, the spacing between the convex points 28 can also be distributed at unequal spacings. When the convex points 28 are arranged unevenly, the spacing difference between the convex points 28 needs to be controlled to be less than 0.2 mm.

[0057] The distances between the plurality of convex points 28 and the side cutting edge 25 are the same, and the distance between the convex points 28 and the side cutting edge 25 is kept wide enough so that the chips move a sufficient distance through the second rake face 232, and the chips have enough space to curl. The vertical distance between the center of the convex point 28 and the side cutting edge 25 can be between 0.8 and 1.2 mm. Specifically in the present embodiment, the distance between the convex point 28 and the side cutting edge 25 is about 0.9 mm.

[0058] In the thickness direction of the cutting insert 10 , that is, in the vertical direction, the height of the protrusion 28 is equal to or lower than the height of the side cutting edge 25 , the height of the protrusion 28 is lower than the height of the boss 26 , and the height of the boss 26 is higher than the height of the side cutting edge 25 .

[0059] Specifically in this embodiment, the height of the protrusion 28 is equal to the height of the side cutting edge 25. When the cutting insert 10 processes a workpiece, chips are generated from the side cutting edge 25, discharged along the first rake face 231, and enter the chip breaker groove 27 along the second rake face 232.

[0060] In a conventional cutting blade, the chips will be in full contact with the bottom surface of the chip breaker groove. When the feed and cutting depth conditions are relatively large, the width and thickness of the chips are relatively large. When the chips are curled, the chips and the bottom surface of the chip breaker groove will produce a large friction resistance, that is, the cutting resistance is large. However, in this embodiment, when the chips encounter the convex point 28 on the bottom surface 233, the chips will be supported by the convex point 28. In addition, since the chips and the convex point 28 are in point contact and the contact area is small, the friction resistance between the chips and the chip breaker groove 27 will be reduced, that is, the cutting resistance is small, which is convenient for smooth discharge.

[0061] The inclined surface 261 is provided with a protrusion 262 and a recess 263 toward the second front angle surface 232. The protrusion 262 and the recess 263 are arranged adjacent to each other, so that the inclined surface 261 is wavy. The protrusion 262 protrudes toward the outside of the boss 26, and the recess 263 is recessed toward the inside of the boss 26.

[0062] The surface of the raised portion 262 is an arc surface. The raised portion 262 has a vertex, which can be the vertex of the arc surface. The vertex of the raised portion 262 is closer to the side cutting edge 25 relative to the recessed portion 263. Regarding the position description of the raised portion 262, for the convenience of description, the vertex of the raised portion 262 is used as the position standard for description. When the chips move to the inclined surface 261, due to the setting of the raised portion 262, the chips only need to make point contact with the raised portion 262, and the chips will not form surface contact with the inclined surface 261 of the boss 26, which can reduce the friction resistance between the chips and the inclined surface 261, and facilitate the curling and discharge of the chips.

[0063] The surface of the recessed portion 263 may be an arc surface. The arc surface of the recessed portion 263 is recessed toward the inner side of the boss 26. The recessed portion 263 can increase the area of ​​the bottom surface 233 at the position of the recessed portion 263. In addition, the recessed portion 263 can increase the space of the chip breaker groove 27, increase the movement space of the chips, and facilitate the smooth curling and discharge of the chips.

[0064] Moreover, the curvature radius corresponding to the arc surface of the concave portion 263 is greater than the curvature radius corresponding to the arc surface of the convex portion 262. The connection between the concave portion 263 and the bottom surface 233 is smoother and more fluent than the connection between the convex portion 262 and the bottom surface 233, which facilitates the chips to pass through the concave portion 263 smoothly and finally be discharged.

[0065] See also Figure 3 The convex part 262 and the concave part 263 can be multiple, respectively, and the convex part 262 and the concave part 263 are alternately arranged in the direction away from the front cutting edge 24. Specifically, in the direction away from the front cutting edge 24, the convex part 262 is sequentially a first convex part 2621, a second convex part 2622 and a third convex part 2623. Regarding the setting position of the convex part 262, for the convenience of description, the apex position of the convex part 262 is used as the standard for description.

[0066] The first protrusion 2621 is located at one end of the inclined surface 261 close to the front cutting edge 24. In addition, the distance from the vertex of the first protrusion 2621 to the center of the front cutting edge 24 is greater than the vertical distance from the first protrusion 2621 to the side cutting edge 25. The arrangement position of the first protrusion 2621 can increase the area of ​​the front end of the chip breaker groove 27 to prevent chips from being blocked there and affecting the normal discharge of chips.

[0067] The chips are lifted up by the first protrusion 2621 at a position close to the front cutting edge 24 , so that the chips can be prevented from accumulating at the front cutting edge 24 .

[0068] In the direction away from the front cutting edge 24, the distances between the plurality of protrusions 262 and the side cutting edge 25 gradually increase. That is, the distance L1 between the vertex S1 of the first protrusion 2621 and the side cutting edge 25 is the shortest; the distance L2 between the vertex S2 of the second protrusion 2622 and the side cutting edge 25 is the second shortest; the distance L3 between the vertex S3 of the third protrusion 2623 and the side cutting edge 25 is the farthest. That is, the distances between the vertices of the first protrusion 2621, the second protrusion 2622, and the third protrusion 2623 and the side cutting edge 25 become larger in sequence. Please refer to Figure 4 , Figure 5 and Figure 6 .

[0069] Therefore, when the chips are discharged toward the wavy boss 26, the chips will first contact the first protrusion 2621, and under the action of the arc-shaped surface at the first protrusion 2621, the chips at this position will first curl. When the chips continue to be discharged along the direction of the chip breaker groove 27, the chips will sequentially contact the second protrusion 2622 and the third protrusion 2623, and correspondingly contact the arc-shaped surface at the vertex, and curl. The chips are constrained by the inclined surface 261, and are sequentially discharged to the vertex S1 of the first protrusion 2621, the vertex S2 of the second protrusion 2622, and the vertex S3 of the third protrusion 2623, and curl, which can effectively control the discharge direction of the chips.

[0070] See also Figure 7 , the distance L4 between the first protrusion 2621 and the second protrusion 2622 is smaller than the distance L5 between the second protrusion 2622 and the third protrusion 2623. That is, the distance L4 from the vertex S1 of the first protrusion 2621 to the vertex S2 of the second protrusion 2622 is smaller than the distance L5 from the vertex S2 of the second protrusion 2622 to the vertex S3 of the third protrusion 2623, that is, L4<L5. In the direction away from the side cutting edge 25, after the chips pass through the convex point 28 at the bottom of the chip breaker groove 27, they will be discharged toward the boss 26. The chips will first contact the protrusion 262 of the boss 26, move upward along the inclined surface 261, and then be effectively curled. Especially under the rough machining conditions with relatively large feed and cutting depth, under the combined effect of the impact force of the chips and the friction resistance of the inclined surface 261 of the boss 26, the chips can be effectively curled and broken.

[0071] The first protrusion 2621 and the third protrusion 2623 are located on the same reference line MM. The reference line MM is set at an angle A with the side cutting edge 25. Moreover, the angle A has a range of 5°≤A≤10°. Therefore, the extension direction of most of the protrusions 262 is at an angle with the extension direction of the side cutting edge 25. Therefore, in the direction away from the front cutting edge 24, the movement space of the chips is getting larger and larger, which is conducive to the smooth discharge of the chips.

[0072] The second protrusion 2622 protrudes from the reference line MM, and the second protrusion 2622 is closer to the side cutting edge 25 relative to the reference line MM. That is, the vertex S1 of the first protrusion 2621 and the vertex S3 of the third protrusion 2623 are located on the same reference line MM, and the vertex S2 of the second protrusion 2622 protrudes from the reference line MM, and the vertex S2 of the second protrusion 2622 is closer to the side cutting edge 25 relative to the reference line MM.

[0073] Due to the effect of the raised portion 262 , the chips will not contact the entire inclined surface 261 of the boss 26 at the same time, thereby achieving the effect of reducing the friction between the chips and the inclined surface 261 .

[0074] In other embodiments, the number of the protrusion 262 and the number of the recess 263 may be one. The protrusion 262 and the recess 263 are arranged adjacent to each other. The protrusion 262 and the recess 263 can simultaneously reduce the friction resistance of the chips, so that the chips can be smoothly curled and discharged.

[0075] In the direction away from the front cutting edge 24, the rear end of the boss 26 is provided with an extension portion 264. The extension portion 264 is bent toward the side cutting edge 25. The extension portion 264 can increase the coverage area of ​​the boss 26 without affecting the chip discharge, and can enhance the overall strength of the cutting part 2.

[0076] See also Figure 8 Now, the working scene of the cutting blade 10 and the chip movement trajectory L are combined to explain the curling process of the chips generated by the cutting blade 10:

[0077] When the chips pass through the first rake face 231 and the second rake face 232 and move to the bottom face 233 in the direction away from the side cutting edge, the chips are supported by the convex point 28, causing the chips to curl. Furthermore, the chips contact the top of the protrusion 262, causing the chips to curl further, break, and finally be discharged smoothly along the chip breaker groove 27.

[0078] In the direction away from the front cutting edge 24 , the chips pass through the first protrusion 2621 , the second protrusion 2622 and the third protrusion 2623 in sequence, and are supported and curled by the first protrusion 2621 , the second protrusion 2622 and the third protrusion 2623 , and are discharged along the extension direction of the chip breaker groove 27 .

[0079] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A cutting insert, characterized in that: The cutting blade comprises a front end face at the front end of the cutting blade, side faces respectively connected to both sides of the front end face, an upper surface connected to the front end face and the two side faces, a front cutting edge at the intersection of the front end face and the upper surface, and a side cutting edge at the intersection of the side faces and the upper surface; The upper surface comprises: A first front angle surface, one side of which is connected to the side cutting edge, and the first front angle surface is inclined downward; A second front angle surface, one side of the second front angle surface is connected to the other side of the first front angle surface, and the second front angle surface is inclined downward relative to the first front angle surface; a bottom surface, one side of the bottom surface being connected to the other side of the second front angle surface; A boss is arranged on the other side of the bottom surface, and the side wall of the boss facing the second front angle surface is a slope. The second front angle surface, the bottom surface and the slope form a chip breaker groove. The slope is provided with a protrusion and a recessed portion toward the second front angle surface. The protrusion protrudes toward the outside of the boss, and the recessed portion is recessed toward the inside of the boss. The protrusion and the recessed portion are adjacent to each other so that the slope is wavy.

2. The cutting insert according to claim 1, characterized in that The boss includes a plurality of protrusions, and the distances between the plurality of protrusions and the side cutting edges gradually increase in a direction away from the front cutting edge.

3. The cutting insert according to claim 1, characterized in that In the direction away from the front cutting edge, the protrusions are sequentially a first protrusion, a second protrusion and a third protrusion, and the first protrusion is located at an end portion of the inclined surface close to the front cutting edge.

4. The cutting insert according to claim 3, characterized in that A distance between the first protrusion and the second protrusion is smaller than a distance between the second protrusion and the third protrusion.

5. The cutting insert according to claim 3, characterized in that The first protrusion and the third protrusion are located on the same reference line, the second protrusion protrudes from the reference line, and the second protrusion is closer to the side cutting edge relative to the reference line.

6. The cutting insert according to claim 1, characterized in that In the thickness direction of the cutting insert, the height of the boss is higher than the height of the side cutting edge.

7. The cutting insert according to claim 1, characterized in that The bottom surface is provided with a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the extending direction of the side cutting edge.

8. The cutting insert according to claim 7, characterized in that The distances between the plurality of protrusions and the side cutting edge are the same.

9. The cutting insert according to claim 7, characterized in that In the thickness direction of the cutting insert, the height of the convex point is equal to or lower than the height of the side cutting edge, the height of the convex point is lower than the height of the boss, and the height of the boss is higher than the height of the side cutting edge.

10. The cutting insert according to claim 7, characterized in that The surface of the convex point is a spherical surface.

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