V-shaped cutter

Abstract

A V-shaped cutter comprises a cutter bar and a cutter head made of cubic boron nitride materials, the cutter head comprises a conical connecting section, a first cutting edge and a second cutting edge, and the first cutting edge and the second cutting edge are obliquely arranged at one end of the conical connecting section. The other end of the conical connecting section is welded on the cutter bar in a vacuum welding manner; wherein the first cutting edge and the second cutting edge are arranged on the conical connecting section, the intersection area of the first cutting edge and the second cutting edge passes through the center line of the conical connecting section and forms a V-shaped structure protruding outwards in a surrounding mode, and the included angle between the first cutting edge and the second cutting edge is larger than or equal to 90 degrees and smaller than or equal to 120 degrees.

Description

TECHNICAL FIELD

[0001] The utility model relates to milling cutter technical field especially relates to a V-shaped knife. BACKGROUND

[0002] With the requirement of machining efficiency, precision of mechanical manufacturing industry is higher and higher, the requirement of cutting tool is also more and more strict, the strength of cutting tool, service life determines the error size and precision of workpiece.

[0003] However, the traditional die steel is used for carving or V groove processing cutter generally adopts the V-shaped knife of hard alloy, and the V-shaped knife of hard alloy must be added cutting fluid in the whole process in the processing process, and the dirty phenomenon can be caused to the working site, and the cutting fluid is discharged to the nature, and the ecological environment is caused great damage, and even the temperature of cutting edge in the processing process is also very high, makes the hard alloy cutting tool wear too fast, and leads to the service life generally low. SUMMARY

[0004] The utility model provides a V-shaped knife, aims at at least one of the technical problems existing in prior art.

[0005] The utility model provides a V-shaped knife, including the knife rod and the cutter head made of cubic boron nitride material, the cutter head includes the taper connecting section, first cutting edge and second cutting edge, first cutting edge and second cutting edge are obliquely arranged in one end of taper connecting section, and the other end of taper connecting section is welded on the knife rod through the mode of vacuum welding.

[0006] Among them, the intersection area of first cutting edge and second cutting edge passes through the center line of taper connecting section and encloses the V-shaped structure that protrudes outward, the included angle between first cutting edge and second cutting edge is greater than or equal to 90 DEG, and less than or equal to 120 DEG.

[0007] In the V-shaped knife of one embodiment of the utility model, first circular arc angle is formed between first cutting edge and second cutting edge, and the ratio of the radius of first circular arc angle to the maximum size of taper connecting section is greater than or equal to 0.03, and less than or equal to 0.07.

[0008] In the V-shaped knife of one embodiment of the utility model, the ratio of the radius of first circular arc angle to the width of first cutting edge and second cutting edge is greater than or equal to 1.1, and less than or equal to 1.25.

[0009] In the V-shaped knife of one embodiment of the utility model, the radius of first circular arc angle is greater than or equal to 0.1mm, and less than or equal to 0.5mm.

[0010] In the V-shaped cutter of the embodiment of the utility model, the width of the first cutting edge and the second cutting edge is greater than or equal to 0.05mm and less than or equal to 0.3mm.

[0011] In the V-shaped cutter of the embodiment of the utility model, the maximum size of the tapered connecting section is greater than or equal to 1mm and less than or equal to 4mm.

[0012] In the V-shaped cutter of the embodiment of the utility model, the ratio of the length of the first cutting edge or the second cutting edge to the height of the first cutting edge or the second cutting edge is greater than or equal to 1.4 and less than or equal to 1.5.

[0013] In the V-shaped cutter of the embodiment of the utility model, the two sides of the first cutting edge and the second cutting edge are formed with first clearance faces, and the included angle between the first clearance face and the vertical line perpendicular to the cutter head in the axial direction is greater than or equal to 30° and less than or equal to 40°.

[0014] In the V-shaped cutter of the embodiment of the utility model, the first clearance face is formed with a second clearance face on the side away from the first cutting edge, and the included angle between the second clearance face and the vertical line perpendicular to the cutter head in the axial direction is greater than or equal to 40° and less than or equal to 60°.

[0015] In the V-shaped cutter of the embodiment of the utility model, the cutter rod is a cutter rod made of hard alloy.

[0016] The technical scheme provided by the embodiment of the application can have the following beneficial effects: the application designs a V-shaped cutter, which comprises a cutter rod and a cutter head made of cubic boron nitride material, so that the V-shaped cutter has high hardness and wear resistance and is suitable for machining high-hardness materials such as die steel, and compared with a V-shaped cutter made of hard alloy, the service life of the cutter can be greatly improved. The other end of the tapered connecting section of the cutter head is welded on the cutter rod by vacuum welding, so as to ensure firm connection and high-temperature resistance; the first cutting edge and the second cutting edge enclose a V-shaped structure that protrudes outward, which can efficiently cut and form clear V-shaped grooves or characters, and the application limits the included angle between the first cutting edge and the second cutting edge to a range of 90° to 120°, so that the V-shaped cutter can be applied to different depths of character engraving or V-groove machining requirements, and the chip removal performance during cutting can be improved, so as to avoid chip accumulation and improve machining efficiency and surface quality.

[0017] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 is a structural schematic view of a V-shaped cutter in the first angle in the embodiment of the present application;

[0020] Figure 2 is a structural schematic view of a V-shaped cutter in the second angle in the embodiment of the present application; Figure 1

[0021] Figure 3 is a structural schematic view of a V-shaped cutter in the third angle in the embodiment of the present application; Figure 1

[0022] Figure 4 is an exploded schematic view of a V-shaped cutter in the embodiment of the present application; Figure 1

[0023] Figure 5 is a structural schematic view of a cutter head in the first angle in the embodiment of the present application; Figure 4

[0024] Figure 6 is a structural schematic view of a cutter head in the second angle in the embodiment of the present application; Figure 4

[0025] Figure 7 is a structural schematic view of a cutter head in the third angle in the embodiment of the present application. Figure 4 Explanation of reference signs:

[0026] 10, cutter head; 10a, cutting section; 10b, conical connecting section; 11, first cutting edge; 12, second cutting edge; 13, first circular arc angle; 14, first relief surface; 15, second relief surface;

[0027] 20, cutter bar; 21, cutter neck.

[0028] DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029]

[0030] ​​​​​​It should also be understood that the terminology used in this utility model specification is merely for describing specific aspects of the present application. It is important to understand that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] like Figures 1 to 7 As shown, this application provides a V-shaped cutter for engraving or V-groove machining on mold steel. It includes a cutter shank 20 and a cutter head 10. The cutter head 10 is made of cubic boron nitride material and is welded to the cutter shank 20 by vacuum welding. This not only ensures the welding strength between the cutter head 10 and the cutter shank 20 and reduces the impact of welding on the performance of the cutter head 10, but also because cubic boron nitride material has excellent wear resistance and high-temperature stability. Cutting fluid is not required during machining, which helps to keep the environment clean. Compared with carbide round nose end mills, it has excellent thermal conductivity, reduces heat damage to the workpiece, and has a longer service life and higher machining efficiency.

[0033] In an optional embodiment, the cutter head 10 includes a tapered connecting section 10b and a cutting section 10a. The cutting section 10a is connected to the tapered connecting section 10b on the side away from the cutter shank 20 and is V-shaped. The tapered connecting section 10b is welded to the cutter shank 20 by vacuum welding to ensure the welding strength between the tapered connecting section 10b and the cutter shank 20, while reducing the impact of welding on the performance of the cutter head 10. Vacuum welding is a high-precision welding method that can be performed in an oxygen-free environment, avoiding the effects of oxidation and impurities, and ensuring high strength and stability of the welded area.

[0034] In an optional embodiment, the tool bar 20 has a main body and a tool neck 21 serving as a connecting support, the diameter of the tool neck 21 is smaller than that of the main body, and the tapered connecting section 10b is welded on the tool neck 21 by vacuum welding, so as to not only reduce the weight of the V-shaped tool, but also optimize the stress distribution of the tapered connecting section 10b and ensure the reliability of the welded connection. The main body can provide sufficient rigidity and stability for the V-shaped tool to support the stress of the entire V-shaped tool during machining.

[0035] In an optional embodiment, the cutting section 10a includes a first cutting edge 11 and a second cutting edge 12, which are obliquely arranged at one end of the tapered connecting section 10b, and the other end of the tapered connecting section 10b is welded on the tool bar 20 by vacuum welding. The intersection area of the first cutting edge 11 and the second cutting edge 12 passes through the center line of the tapered connecting section 10b and forms a V-shaped structure protruding outward, so as to be able to efficiently cut and form clear V-shaped grooves or characters. The included angle θ between the first cutting edge 11 and the second cutting edge 12 is greater than or equal to 90° and less than or equal to 120°, so as to be suitable for different depth of character carving or V-groove machining requirements, and also to improve the chip removal performance during cutting, avoid chip accumulation, and thus improve the machining efficiency and surface quality.

[0036] In an optional embodiment, a first circular arc angle 13 is formed between the first cutting edge 11 and the second cutting edge 12, which not only can effectively reduce the stress concentration during cutting, improve the strength and durability of the tool, but also can improve the chip removal performance during cutting, avoid chip accumulation, and thus improve the machining efficiency and surface quality. The ratio of the radius R of the first circular arc angle 13 to the maximum size D of the tapered connecting section 10b is greater than or equal to 0.03 and less than or equal to 0.07, which can not only ensure the strength of the circular arc angle, but also ensure the sharpness of the cutting edge.

[0037] For example, when the ratio of the radius R of the first circular arc angle 13 to the maximum size D of the tapered connecting section 10b is <0.03, the circular arc angle may be too sharp, which is easy to cause stress concentration and reduce the tool life. When the ratio of the radius R of the first circular arc angle 13 to the maximum size D of the tapered connecting section 10b is >0.07, the circular arc angle may be too flat, which affects the sharpness of the cutting edge and reduces the machining precision. Therefore, the ratio of the radius R of the first circular arc angle 13 to the maximum size D of the tapered connecting section 10b is limited to 0.03 to 0.07, which can make the tool more stable during machining, reduce vibration, and thus improve the smoothness of the machined surface. Meanwhile, the circular arc angle can also reduce the wear of the tool and prolong the service life for machining of high-hardness materials such as die steel.

[0038] In an optional embodiment, the ratio of the radius R of the first arc angle 13 to the width W of the first cutting edge 11 and the second cutting edge 12 is greater than or equal to 1.1 and less than or equal to 1.25, so that the radius of the arc angle can be slightly larger than the width of the cutting edge, so as to ensure the strength of the cutting edge while also taking into account the sharpness of the cutting and the chip removal performance.

[0039] For example, when the ratio of the radius R of the first arc angle 13 to the width W of the first cutting edge 11 and the second cutting edge 12 is greater than or equal to 1.1, it can be ensured that the radius of the arc angle is large enough to avoid the arc angle being too sharp, thereby reducing stress concentration and improving the impact resistance and durability of the tool. When the ratio of the radius R of the first arc angle 13 to the width W of the first cutting edge 11 and the second cutting edge 12 is less than or equal to 1.25, the radius R of the first arc angle 13 will not be too large, avoiding the cutting edge being too flat and affecting the sharpness of the cutting and the machining precision; that is, the ratio of the arc angle to the width of the cutting edge directly affects the strength, cutting performance and machining effect of the tool. Therefore, the present application limits the ratio of the radius R of the first arc angle 13 to the width W of the first cutting edge 11 and the second cutting edge 12 to be within the range of 1.1 to 1.25, which not only makes the tool more stable during cutting, reduces vibration, and thus improves the smoothness of the machined surface, but also effectively disperses the cutting force, improves the chip removal performance, avoids chip accumulation, reduces tool wear, prolongs the service life, and improves the machining efficiency.

[0040] In an optional embodiment, the radius R of the first arc angle 13 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm, which not only effectively disperses the cutting force, reduces tool wear, and prolongs the service life, but also makes the cutting process smoother, reduces vibration and burrs, and improves the smoothness of the machined surface. The radius of the first arc angle 13 directly affects the strength, cutting performance and quality of the machined surface of the tool, and a too small radius can cause stress concentration and reduce tool life, while a too large radius can affect the sharpness of the cutting edge and reduce machining precision.

[0041] For example, when the radius R of the first arc angle 13 is greater than or equal to 0.1 mm, it can be ensured that the arc angle has sufficient strength to avoid stress concentration and tool damage due to a too small radius. When the radius R of the first arc angle 13 is less than or equal to 0.5 mm, the arc angle can be limited to be not too large to ensure the sharpness of the cutting edge, thereby ensuring the machining precision and surface quality. Therefore, the present application limits the radius R of the first arc angle 13 to be within the range of 0.1 mm to 0.5 mm, which can ensure that the cutting edge is more stable when cutting into the material during the lettering or V-groove machining of die steel, effectively disperses the cutting force, reduces machining defects and tool wear, and prolongs the service life.

[0042] In an optional embodiment, the width W of the first cutting edge 11 and the second cutting edge 12 is greater than or equal to 0.05 mm and less than or equal to 0.3 mm, which not only ensures more accurate cutting and reduces processing errors, but also makes the cutting process smoother, reduces vibration and burrs, and improves the smoothness of the machined surface. The width W of the first cutting edge 11 and the second cutting edge 12 directly affects the sharpness, cutting force and machining accuracy of the tool. If the width W of the first cutting edge 11 and the second cutting edge 12 is too small, the cutting edge strength may be insufficient and easily damaged. If the width W of the first cutting edge 11 and the second cutting edge 12 is too large, the cutting force may increase, affecting the machining accuracy and surface quality.

[0043] For example, when the width W of the first cutting edge 11 and the second cutting edge 12 is greater than or equal to 0.05 mm, the cutting edge has sufficient strength to avoid damage due to too small width. When the width W of the first cutting edge 11 and the second cutting edge 12 is less than or equal to 0.3 mm, the cutting edge is not too wide to ensure the sharpness of the cutting edge, thereby ensuring the machining accuracy and surface quality. Therefore, by limiting the width W of the first cutting edge 11 and the second cutting edge 12 to be within the range of 0.05 mm to 0.3 mm, the optimized design of the cutting edge width in the lettering or V-groove machining of die steel can ensure that the cutting edge is more stable when cutting into the material, reducing processing defects. Not only improves the strength and durability of the tool, but also optimizes the cutting performance and machining surface quality, especially suitable for precise machining of high-hardness materials.

[0044] In an optional embodiment, the maximum dimension D of the conical connecting section 10b is greater than or equal to 1 mm and less than or equal to 4 mm, which can effectively reduce the stress concentration at the connection between the tool bit 10 and the tool rod 20, and improve the overall strength and durability of the tool. The conical connecting section 10b is a transition part between the tool bit 10 and the tool rod 20, which mainly functions to enhance structural stability and disperse stress.

[0045] Exemplarily, when the maximum size D of the tapered connecting section 10b is ≥1 mm, it can be ensured that the tapered connecting section 10b has a sufficient size to withstand the force and vibration generated in the cutting process, avoiding breakage or deformation due to the size being too small. When the maximum size D of the tapered connecting section 10b is ≤4 mm, it can limit the tapered connecting section 10b from being too large, avoiding increasing the overall weight and inertia of the tool, thereby maintaining the flexibility and machining accuracy of the tool. Therefore, the present application limits the maximum size D of the tapered connecting section 10b to be within the range of 1 mm to 4 mm, which not only can enhance the overall rigidity of the tool, reduce vibration in the cutting process, and enable the tool to maintain stable performance in high-precision machining, ensuring the consistency and repeatability of machining, thereby improving the smoothness of the machined surface. Moreover, it can effectively disperse the cutting force, reduce wear at the connection between the tool bit 10 and the tool rod 20, and prolong the service life of the tool.

[0046] In an optional embodiment, the ratio of the length of the first cutting edge 11 or the second cutting edge 12 to the height of the first cutting edge 11 or the second cutting edge 12 is greater than or equal to 1.4 and less than or equal to 1.5, which can make the cutting edge more efficient in the machining process, reduce the number of cutting times, and improve the machining efficiency. The ratio of the length of the first cutting edge 11 or the second cutting edge 12 to the height of the first cutting edge 11 or the second cutting edge 12 directly affects the cutting efficiency, strength, and machining accuracy of the tool. For high-precision machining, a reasonable ratio can improve the repeat positioning accuracy of the tool and ensure the consistency of machining.

[0047] It should be noted that the length of the first cutting edge 11 or the second cutting edge 12 refers to the extension distance of the first cutting edge 11 or the second cutting edge 12, and the height of the second cutting edge 12 refers to the vertical distance of the first cutting edge 11 or the second cutting edge 12.

[0048] Exemplarily, when the ratio of the length of the first cutting edge 11 or the second cutting edge 12 to the height of the first cutting edge 11 or the second cutting edge 12 is ≥1.4, it can be ensured that the cutting edge has a sufficient length to effectively cover the machining area and improve the cutting efficiency. When the ratio of the length of the first cutting edge 11 or the second cutting edge 12 to the height of the first cutting edge 11 or the second cutting edge 12 is ≤1.5, it can limit the cutting edge from being too long, avoiding the problem of insufficient strength or vibration due to the length being too large. Therefore, a reasonable length-to-height ratio can not only make the cutting edge more efficient in the machining process, reduce the number of cutting times, and improve the machining efficiency, but also balance the length and height of the cutting edge, reduce vibration in the cutting process, ensure that the cutting edge has sufficient strength in the machining process, avoid breakage or deformation, and improve the smoothness and dimensional accuracy of the machined surface.

[0049] In an optional embodiment, two sides of the first cutting edge 11 and the second cutting edge 12 are formed with a first clearance face 14, and an angle a between the first clearance face 14 and a vertical line perpendicular to the axis direction of the tool head 10 is greater than or equal to 30° and less than or equal to 40°, so that the cutting process is more stable, vibration and burr are reduced, and the smoothness of the machined surface is improved. Not only can the friction between the cutting edge and the workpiece be reduced, thereby reducing the cutting force and cutting heat and improving the machining efficiency, but also the wear of the cutting edge can be reduced, thereby prolonging the service life of the tool.

[0050] For example, when the angle a between the first clearance face 14 and the vertical line perpendicular to the axis direction of the tool head 10 is greater than or equal to 30°, it can be ensured that the first clearance face 14 has a sufficient inclination angle, which can effectively reduce the contact area between the cutting edge and the workpiece, thereby reducing the friction and the cutting force. When the angle a between the first clearance face 14 and the vertical line perpendicular to the axis direction of the tool head 10 is less than or equal to 40°, the first clearance face 14 can be limited to be not too large, so as to avoid the problems of insufficient strength of the cutting edge or chipping caused by too large angle. Therefore, the angle a between the first clearance face 14 and the vertical line perpendicular to the axis direction of the tool head 10 is limited to be within the range of 30° to 40° in the present application, and the optimized design of the first clearance face 14 can ensure that the tool is more stable when cutting into the material, reduce machining defects, reduce the cutting force and cutting heat, and improve the service life of the tool and the quality of the machined surface.

[0051] In an optional embodiment, the first clearance face 14 is formed with a second clearance face 15 on the side away from the first cutting edge 11, and an angle β between the second clearance face 15 and the vertical line perpendicular to the axis direction of the tool head 10 is greater than or equal to 40° and less than or equal to 60°. Not only can the friction between the cutting edge and the workpiece be further reduced, thereby reducing the cutting force and cutting heat and improving the machining efficiency, but also the chip can be more smoothly discharged, thereby avoiding chip accumulation and improving the machining efficiency. At the same time, the wear of the cutting edge can be reduced, thereby prolonging the service life of the tool. The second clearance face 15 is an extension of the first clearance face 14, and its main function is to further reduce the friction between the cutting edge and the workpiece and improve the chip removal performance. Through the reasonable design of the second clearance face 15, the cutting force can be reduced, the cutting heat can be reduced, and the machined surface quality can be improved.

[0052] For example, when the included angle β between the second clearance face 15 and the vertical line perpendicular to the axis of the tool head 10 is greater than or equal to 40°, it can be ensured that the second clearance face 15 has a sufficient inclination angle, which can effectively reduce the contact area between the cutting edge and the workpiece, thereby further reducing the friction and cutting force. When the included angle β between the second clearance face 15 and the vertical line perpendicular to the axis of the tool head 10 is less than or equal to 60°, it can be limited that the second clearance face 15 is not too large to avoid the problem of insufficient strength of the cutting edge or chipping due to too large angle. Therefore, the present application limits the included angle β between the second clearance face 15 and the vertical line perpendicular to the axis of the tool head 10 to be within the range of 40° to 60°, which can make the cutting process more stable, reduce vibration and burr, and improve the smoothness of the machined surface.

[0053] In an optional embodiment, the tool bar 20 is made of hard alloy, which can effectively reduce the deformation of the tool during cutting, especially in high-speed cutting and high-load machining, to ensure the machining precision and surface quality and prolong the service life of the V-shaped tool.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection. It can be mechanical connection, or electrical connection. It can be direct connection, or indirect connection through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0056] The foregoing disclosure provides many different embodiments or examples for implementing different structures of the present application. For simplicity of disclosure, the foregoing description has focused on a particular example of a component or a particular example of a process flow. In the interest of simplifying the present disclosure, the foregoing description has not provided variations of the components or the process flow that can be used in different examples. It is to be understood that the disclosure is intended to encompass all such variations, modifications and other implementations of the present application as well as many others not particularly recited herein. Additionally, it is to be understood that the description of a particular example or implementation should not necessarily be taken as an implicit indication that such a particular example or implementation is not an embodiment of the present application.

[0057] In the description of the present application, the terms "one embodiment", "some embodiments", "an exemplary embodiment", "an example", "a specific example" or "some examples" are intended to mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. The appearances of the above terms in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A V-shaped knife characterized in that, The tool bit includes a taper connecting section, a first cutting edge and a second cutting edge, the first cutting edge and the second cutting edge are obliquely arranged at one end of the taper connecting section, and the other end of the taper connecting section is welded on the tool bar by vacuum welding. The intersection area of the first cutting edge and the second cutting edge passes through the center line of the taper connecting section and forms an outwardly convex V-shaped structure, the included angle between the first cutting edge and the second cutting edge is greater than or equal to 90° and less than or equal to 120°.

2. The V-shaped knife according to claim 1, wherein A first circular arc angle is formed between the first cutting edge and the second cutting edge, the ratio of the radius of the first circular arc angle to the maximum size of the taper connecting section is greater than or equal to 0.03 and less than or equal to 0.

07.

3. The V-shaped knife of claim 2, wherein, The ratio of the radius of the first circular arc angle to the width of the first cutting edge and the second cutting edge is greater than or equal to 1.1 and less than or equal to 1.

25.

4. The V-shaped knife according to claim 2 or 3, characterized in that The radius of the first circular arc angle is greater than or equal to 0.1mm and less than or equal to 0.5mm.

5. The V-shaped knife according to claim 2 or 3, characterized in that The width of the first cutting edge and the second cutting edge is greater than or equal to 0.05mm and less than or equal to 0.3mm.

6. The V-shaped knife according to claim 2 or 3, characterized in that The maximum size of the taper connecting section is greater than or equal to 1mm and less than or equal to 4mm.

7. The V-shaped knife of claim 1, wherein The ratio of the length of the first cutting edge or the second cutting edge to the height of the first cutting edge or the second cutting edge is greater than or equal to 1.4 and less than or equal to 1.

5.

8. The V-shaped knife of claim 1, wherein, Two sides of the first cutting edge and the second cutting edge form a first clearance face, the included angle between the first clearance face and the vertical line perpendicular to the axis direction of the tool bit is greater than or equal to 30° and less than or equal to 40°.

9. The V-shaped knife of claim 8, wherein, The first clearance face forms a second clearance face on the side away from the first cutting edge, the included angle between the second clearance face and the vertical line perpendicular to the axis direction of the tool bit is greater than or equal to 40° and less than or equal to 60°.

10. The V-shaped knife of claim 1, wherein, The tool bar is a cemented carbide tool bar.

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