Chamfering tool

Abstract

The utility model discloses a rose reamer, which comprises a reamer handle, the mounting part is connected to one end of the cutter handle, and a mounting groove is formed in the outer side wall of the mounting part; the PCD composite sheet comprises a substrate and a diamond cutting sheet stacked with the substrate, one surface, far away from the substrate, of the diamond cutting sheet is a first matching surface, the mounting groove is provided with a second matching surface, and the first matching surface is connected with the second matching surface, so that the PCD composite sheet is mounted in the mounting groove; the diamond cutting blade further comprises a first rear tool face which is connected to the side, away from the tool handle, of the first matching face, an included angle is formed between the first rear tool face and the first matching face, and the first rear tool face and the first matching face are arranged in a back-to-back mode and matched to form a chamfering edge. The chamfering cutter is favorable for reducing the size of the cutter head.

Description

Technical Field

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

[0002] After printed circuit boards (PCBs) are cut, milling is often used to chamfer the edges to improve the structural strength of the board edges, facilitate assembly with other components, and enhance the board's aesthetics. Currently, the PCB manufacturing industry generally uses carbide chamfering cutters for this purpose. However, with the widespread use of wear-resistant ceramic-filled boards and the promotion of metal substrates (such as aluminum substrates), traditional carbide chamfering cutters are prone to problems such as rapid tool wear and severe edge burrs when processing these types of boards, failing to meet the demands for stable, high-quality batch processing. Furthermore, as the integration level of PCBs continues to increase and their structures become more compact, the space left for tool clearance after cutting is constantly shrinking, placing higher demands on the miniaturization of tool dimensions.

[0003] Polycrystalline diamond (PCD) is widely used in tool manufacturing due to its extremely high hardness and excellent lifespan. However, due to the current limitations in the thickness of PCD composite sheets and welding processes, the cutting head size of PCD chamfering tools remains relatively large and difficult to reduce. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a chamfering tool that facilitates the reduction of the size of its cutting head.

[0005] A chamfering tool according to a first aspect of the present invention includes: a tool holder; a mounting portion connected to one end of the tool holder, wherein a mounting groove is provided on the outer side wall of the mounting portion; and a PCD composite sheet, wherein the PCD composite sheet includes a substrate and a diamond cutting blade stacked with the substrate, wherein the side of the diamond cutting blade away from the substrate is a first mating surface, and the mounting groove has a second mating surface, wherein the first mating surface is connected to the second mating surface so that the PCD composite sheet is mounted in the mounting groove.

[0006] The diamond cutting disc further includes a first flank face connected to the side of the first mating surface away from the tool holder and set at an angle to the first mating surface. The first flank face is set opposite to the first mating surface, and the first flank face and the first mating surface cooperate to form a chamfering edge.

[0007] The chamfering blade according to the embodiments of this utility model has at least the following beneficial effects:

[0008] In the chamfering blade of this utility model, by setting a mounting groove on the side wall of the mounting part and connecting the first mating surface of the diamond cutting blade away from the substrate to the second mating surface on the mounting groove, there is no need to set a support part on the mounting part. This is beneficial for the miniaturization design of the chamfering blade head and also for setting a multi-blade structure while reducing the size of the chamfering blade head.

[0009] According to some embodiments of the present invention, the second mating surface is arranged parallel to the rotation center axis of the chamfering cutter, and the second mating surface and the rotation center axis of the chamfering cutter are spaced apart in the radial direction of the chamfering cutter.

[0010] According to some embodiments of the present invention, the end of the mounting groove away from the tool holder is formed with a positioning angle, and the PCD composite sheet has a positioning shoulder that positions and cooperates with the positioning angle.

[0011] According to some embodiments of the present invention, the direction from the mounting portion to the tool holder is defined as the first direction, and the direction from the diamond cutting blade to the substrate is defined as the second direction;

[0012] The first flank face extends from the side of the first mating surface away from the tool holder along the first direction and is inclined along the second direction.

[0013] According to some embodiments of the present invention, the PCD composite sheet further includes a second rear cutting surface, which is disposed opposite to the first mating surface. The second rear cutting surface is connected to the side of the first rear cutting surface near the handle. The second rear cutting surface extends from the side of the first rear cutting surface near the handle along the first direction and is inclined along the second direction.

[0014] The angle between the first rear cutting face and the rotation center axis of the chamfering cutter is greater than the angle between the second rear cutting face and the rotation center axis of the chamfering cutter.

[0015] According to some embodiments of the present invention, the angle between the first flank face and the cutting plane of the chamfering tool is β, and the angle between the second flank face and the cutting plane of the chamfering tool is γ;

[0016] It satisfies: β < γ, and 3° ≤ β ≤ 20°, 10° ≤ γ ≤ 40°.

[0017] According to some embodiments of the present invention, the direction from the mounting portion to the tool holder is defined as the first direction, and the direction from the diamond cutting blade to the substrate is defined as the second direction;

[0018] The PCD composite sheet also has a first clearance surface disposed opposite to the first mating surface. The first clearance surface extends from the tip of the chamfering edge along the first direction and is inclined along the second direction.

[0019] The mounting part is also provided with a second clearance surface, which is located on the side of the first clearance surface away from the sharp corner of the chamfering edge.

[0020] According to some embodiments of the present invention, the mounting part is further provided with a chip removal groove, which is disposed opposite to the second mating surface.

[0021] According to some embodiments of the present invention, the first mating surface is welded to the second mating surface.

[0022] According to some embodiments of the present invention, the outer wall of the mounting part is provided with a plurality of mounting grooves spaced apart along the circumference of the mounting part, and the number of PCD composite sheets is plurality of, with each of the plurality of PCD composite sheets being disposed in a corresponding manner in the plurality of mounting grooves.

[0023] 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

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a partial structural schematic diagram of a chamfering tool according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the knife handle and mounting part according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of a PCD composite sheet according to an embodiment of the present invention;

[0028] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This is another structural schematic diagram of a PCD composite sheet according to an embodiment of the present invention;

[0030] Icon labels:

[0031] 100. Knife handle;

[0032] 200. Mounting section; 210. Mounting groove; 211. Second mating surface; 212. Positioning angle; 220. Chip removal groove; 230. Second clearance surface;

[0033] 300, PCD composite sheet; 310, substrate; 320, diamond cutting disc; 321, first mating surface; 322, first flank face; 323, chamfering edge; 324, second flank face; 325, positioning shoulder; 330, first clearance surface;

[0034] 400. Transition Section. Detailed Implementation

[0035] 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.

[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] like Figure 1 As shown, a chamfering tool provided in one embodiment of the present invention includes a handle 100, a mounting part 200, and a PCD composite sheet 300.

[0039] The mounting part 200 is connected to one end of the tool holder 100, and the mounting part 200 and the tool holder 100 are coaxially arranged.

[0040] Specifically, both the tool holder 100 and the mounting portion 200 are cylindrical structures, and they are integrally formed. A transition portion 400 can be provided between the tool holder 100 and the mounting portion 200. Specifically, the diameter of the mounting portion 200 is smaller than the diameter of the tool holder 100, and the mounting portion 200 and the tool holder 100 are coaxially arranged. The transition portion 400 is a conical structure, with its large-diameter end connected to the tool holder 100 and its small-diameter end connected to the mounting portion 200. The transition portion 400 allows for a smooth transition between the tool holder 100 and the mounting portion 200, reducing the risk of tool breakage under milling forces. In addition, the smaller diameter of the mounting portion 200 compared to the tool holder 100 allows for greater clamping rigidity while reducing the diameter of the head cutting area, making it suitable for chamfering milling of compact PCB boards or narrow-pitch clearance slots.

[0041] Combination Figure 1 and Figure 2 Furthermore, the outer wall of the mounting part 200 is provided with a mounting groove 210.

[0042] Specifically, the mounting groove 210 is formed on the outer side wall of the mounting portion 200 and extends through the end of the mounting portion 200 away from the tool holder 100, and the mounting groove 210 extends from the end of the mounting portion 200 away from the tool holder 100 toward the tool holder 100.

[0043] like Figure 1 As shown, the PCD composite sheet 300 includes a substrate 310 and a diamond cutting sheet 320 stacked with the substrate 310.

[0044] Specifically, the substrate 310 and the diamond cutting blade 320 are stacked and laminated together. The substrate 310 can be made of an alloy material. The substrate 310 serves as a support for the diamond cutting blade 320, protecting the diamond from cracking. In addition, due to the high hardness and excellent lifespan of PCD, the chamfering tool of this invention uses a PCD composite sheet 300 as the cutting part of the chamfering tool, which can improve the hardness and lifespan of the chamfering tool.

[0045] Combination Figure 1 and Figure 5 It should be noted that the side of the diamond cutting blade 320 away from the substrate 310 is the first mating surface 321, and the mounting groove 210 has a second mating surface 211. The first mating surface 321 is connected to the second mating surface 211 so that the PCD composite sheet 300 is mounted in the mounting groove 210.

[0046] Understandably, the side of the diamond cutting disc 320 away from the substrate 310 (the first mating surface) is polished, and the first mating surface 321 is welded together with the second mating surface 211, thereby achieving the purpose of mounting the PCD composite disc 300 in the mounting groove 210. It should be noted that after the PCD composite disc 300 is mounted in the mounting groove 210, the chamfering edge 323 of the PCD composite disc 300 protrudes from the end of the mounting portion 200 away from the tool holder 100. The chamfering edge 323 of the PCD composite disc 300 is used to cut the workpiece to form a chamfer on the workpiece.

[0047] Combination Figure 1 and Figure 3 Specifically, the diamond cutting disc 320 also includes a first flank face 322 connected to the side of the first mating surface 321 away from the tool holder 100 and set at an angle to the first mating surface 321. The first flank face 322 is set opposite to the first mating surface 321, and the first flank face 322 and the first mating surface 321 cooperate to form a chamfering edge 323.

[0048] More specifically, the direction from the mounting portion 200 to the tool holder 100 is defined as the first direction, and the direction from the diamond cutting blade 320 to the substrate 310 is defined as the second direction; the first flank face 322 extends from the side of the first mating surface 321 away from the tool holder 100 along the first direction and is inclined along the second direction.

[0049] Furthermore, the angle between the chamfering edge 323 and the rotation center axis of the chamfering tool is α, which satisfies: 10°≤α≤70°.

[0050] It is understood that the angle α between the chamfering blade 323 and the rotation center axis of the chamfering tool corresponds to the chamfering angle of the workpiece being machined. The value of angle α can be set to 10°, 15°, 20°, 25°, 30°, 45°, 60°, or 70°, but is not limited to the listed values.

[0051] It should be noted that in traditional chamfering tools, to mount the PCD composite sheet 300, a support portion is typically provided on the mounting part 200, and then the side of the substrate 310 away from the diamond cutting blade 320 is welded to the support portion. The support portion, located on the side of the substrate 310 away from the diamond cutting blade 320, occupies space, resulting in a relatively large overall chamfering tool head. However, in this application, by providing a mounting groove 210 on the side wall of the mounting part 200 and connecting the first mating surface 321 of the diamond cutting blade 320 away from the substrate 310 to the second mating surface 211 on the mounting groove 210, the aforementioned support portion is unnecessary, which facilitates a miniaturized chamfering tool head design.

[0052] like Figure 1 , Figure 2As shown, in some embodiments, the second mating surface 211 is spaced apart from the rotation center axis of the chamfering tool in the radial direction of the chamfering tool.

[0053] It is understandable that the second mating surface 211 of the mounting groove 210 plays a positioning role for the PCD composite sheet 300. When the first mating surface 321 of the PCD composite sheet 300 is connected to the second mating surface 211 of the mounting groove 210, there will be a certain distance between the chamfering blade 323 and the rotation center axis of the chamfering tool in the radial direction of the chamfering tool.

[0054] In some embodiments, the second mating surface 211 is arranged parallel to the rotation center axis of the chamfering tool and spaced apart from the rotation center axis of the chamfering tool in the radial direction of the chamfering tool. In other embodiments, the second mating surface 211 and the rotation center axis of the chamfering tool may also be arranged at a certain angle. The angle can be set to any value between 0 and 30°, such as 5°, 10°, 15°, 20°, 25°, and 30°, but is not limited to the listed values.

[0055] Combination Figure 1 and Figure 3 In some embodiments, the PCD composite sheet 300 further includes a second flank face 324, which is disposed opposite to the first mating surface 321. The second flank face 324 is connected to the side of the first flank face 322 near the shank 100. The second flank face 324 extends from the side of the first flank face 322 near the shank 100 along a first direction and is inclined along a second direction. The angle between the first flank face 322 and the rotation center axis of the chamfering tool is greater than the angle between the second flank face 324 and the rotation center axis of the chamfering tool.

[0056] Understandably, the setting of the second flank face 324 can serve to avoid interference between the non-beveling edge and the workpiece when the chamfering tool is machining it, thus preventing the machining process from being affected.

[0057] Combination Figure 3 and Figure 4 From another perspective, the angle between the first flank face 322 and the cutting plane of the chamfering tool is β, and the angle between the second flank face 324 and the cutting plane of the chamfering tool is γ; where β < γ.

[0058] It is understandable that a line located in the cutting plane of the chamfering tool and perpendicular to the chamfering edge 323 is defined as the reference line, the angle between the first flank face 322 and the reference line is β, and the angle between the second flank face 324 and the reference line is γ.

[0059] Where 3°≤β≤20°, β can be set to 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 12°, 13°, 15°, 17°, 18°, or 20°, but is not limited to the listed values. 10°≤γ≤40°, γ can be set to 10°, 12°, 16°, 18°, 20°, 25°, 30°, 35°, or 40°, but is not limited to the listed values. However, β < γ must be guaranteed.

[0060] Combination Figure 1 and Figure 3 In some embodiments, the PCD composite sheet 300 also has a first clearance surface 330 disposed opposite to the first mating surface 321. The first clearance surface 330 extends from the tip of the chamfering edge 323 along a first direction and is inclined along a second direction.

[0061] It should be noted that the first clearance surface 330 extends not only on the diamond cutting blade 320, but also on the substrate 310. The first clearance surface 330 can play a clearance role, preventing the non-beveling edge part of the chamfering tool from interfering with the workpiece and affecting the processing when the chamfering tool is processing the workpiece.

[0062] Furthermore, the angle between the first clearance surface 330 and the rotation center axis of the chamfering cutter is smaller than the angle between the second rear cutting surface 324 and the rotation center axis of the chamfering cutter.

[0063] like Figure 1 As shown, the mounting part 200 is also provided with a second clearance surface 230. The second clearance surface 230 is located on the side of the first clearance surface 330 away from the sharp corner of the chamfering blade 323. The angle between the second clearance surface 230 and the rotation center axis of the chamfering blade is smaller than the angle between the second back blade surface 324 and the rotation center axis of the chamfering blade.

[0064] In this embodiment, the second clearance surface 230 and the first clearance surface 330 are on the same plane. Of course, in other embodiments, the second clearance surface 230 and the first clearance surface 330 can also be set at a certain angle. Preferably, the angle between the second clearance surface 230 and the rotation center axis of the chamfering tool is less than or equal to the angle between the second rear cutting surface 324 and the rotation center axis of the chamfering tool.

[0065] like Figure 3 As shown, in this specific embodiment, the second clearance surface 230 and the first clearance surface 330 are on the same plane, and the angle between the first clearance surface 330 and the rotation center axis of the chamfering tool is ε; satisfying: 10°≤ε≤45°, ε can be set to 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, but is not limited to the listed values.

[0066] Combination Figure 1 and Figure 2It should be noted that the mounting part 200 is also provided with a chip removal groove 220, which is set opposite to the second mating surface 211. The chip removal groove 220 realizes the collection and discharge of chips during the cutting process of the chamfering edge 323.

[0067] Furthermore, the second clearance surface 230 is located on the side of the chip removal groove 220 away from the tool holder 100.

[0068] It should be noted that the chip removal groove 220 is a planar chip removal groove. The chip removal groove 220 forms an angle with the rotation center axis of the chamfering tool. The angle of this angle is 20° to 50°, such as 20°, 25°, 30°, 35°, 40°, 45°, and 50°, but is not limited to the listed values.

[0069] Combination Figure 2 and Figure 5 In some embodiments, the end of the mounting groove 210 away from the tool holder 100 has a positioning angle 212, and the PCD composite sheet 300 has a positioning shoulder 325 that engages with the positioning angle 212. Thus, when positioning the PCD composite sheet 300 with the mounting groove 210, aligning the positioning shoulder 325 with the positioning angle 212 improves the positioning accuracy of the PCD composite, reducing the subsequent grinding allowance caused by positioning errors and increasing production efficiency.

[0070] like Figure 3 As shown, in some embodiments, the thickness of the PCD composite sheet 300 can be 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 2.0 mm, etc., but is not limited to the listed values. As the diameter of the mounting portion 200 decreases, a correspondingly thinner PCD composite sheet 300 should be used. It should be noted that the thickness direction of the PCD composite sheet 300 is the stacking direction of the substrate 310 and the diamond cutting blade 320.

[0071] like Figure 1 As shown, in some embodiments, the diameter of the mounting portion 200 is set in the range of 1.0mm to 3.175mm, for example 1.0mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.5mm, 3.175mm, but is not limited to the listed values.

[0072] Furthermore, the diameter of the tool holder 100 can be set to 3.175mm, 4.0mm, 6.0mm, or 8.0mm, but is not limited to the values ​​listed.

[0073] It should be noted that the chamfering edge 323 can reserve a certain grinding allowance in the direction away from the tool holder 100. After a certain period of milling, when the tool edge wears, it can be re-grinded to improve the overall service life of the tool and reduce the cost of using the tool.

[0074] In some embodiments, the diamond cutting disc 320 may be a polycrystalline diamond composite disc or a single diamond crystal.

[0075] Furthermore, the tool holder 100 and the mounting part 200 can be made of cemented carbide or cast iron. If cemented carbide is used, the mounting groove 210 is formed by grinding with a five-axis CNC grinding wheel. If cast iron is used, the mounting groove 210 is formed by milling with a CNC machining center.

[0076] It should be noted that during the process of fixing the diamond cutting disc 320 to the mounting part 200, solder paste can be applied to the first mating surface 321 and / or the second mating surface 211 first, and then the first mating surface 321 and the second mating surface 211 are mated together. After that, the diamond cutting disc 320 and the mounting part 200 are welded and fixed by a high-temperature vacuum welding process. High-temperature vacuum welding can effectively remove excess solder paste and avoid the tool tip tilting due to uneven application of solder paste, which would affect the tool structure parameters and grinding allowance.

[0077] It should be noted that the PCD composite sheet 300 can be ground and sharpened using a regular manual three-axis diamond grinding machine, a four-axis semi-automatic grinding machine, or a five-axis CNC grinding machine. The processing threshold is low and the efficiency is high. Of course, laser processing equipment can also be used, which has high processing precision and low consumable costs.

[0078] In some embodiments, the outer wall of the mounting portion 200 is provided with a plurality of mounting grooves 210 spaced apart circumferentially along the mounting portion 200. Figure 1 The image shows two mounting slots, and the number of PCD composite sheets 300 is multiple. Figure 1 The diagram shows two PCD composite sheets 300, and multiple PCD composite sheets 300 are respectively disposed in multiple mounting slots 210. In this way, the chamfering tool of this invention can achieve the purpose of multiple blades.

[0079] In the chamfering blade 323 of this utility model, by providing a mounting groove 210 on the side wall of the mounting part 200 and connecting the first mating surface 321 of the diamond cutting blade 320 away from the substrate 310 to the second mating surface 211 on the mounting groove 210, there is no need to provide a support part on the mounting part 200. This is beneficial for the miniaturization design of the chamfering blade head and also for setting a multi-blade structure while reducing the size of the chamfering blade head.

[0080] 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.

[0081] 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 chamfering tool, characterized in that, include: Handle; The mounting part is connected to one end of the tool holder, and the outer side wall of the mounting part is provided with a mounting groove; PCD composite sheet, the PCD composite sheet includes a substrate and a diamond cutting blade stacked with the substrate, the side of the diamond cutting blade away from the substrate is a first mating surface, the mounting groove has a second mating surface, the first mating surface is connected to the second mating surface, so that the PCD composite sheet is mounted in the mounting groove; The diamond cutting disc further includes a first flank face connected to the side of the first mating surface away from the tool holder and set at an angle to the first mating surface. The first flank face is set opposite to the first mating surface, and the first flank face and the first mating surface cooperate to form a chamfering edge.

2. The chamfering tool according to claim 1, characterized in that, The second mating surface is arranged parallel to the rotation center axis of the chamfering cutter, and the second mating surface and the rotation center axis of the chamfering cutter are spaced apart in the radial direction of the chamfering cutter.

3. The chamfering tool according to claim 1, characterized in that, The mounting groove has a positioning angle at the end away from the tool holder, and the PCD composite sheet has a positioning shoulder that positions and engages with the positioning angle.

4. The chamfering tool according to claim 1, characterized in that, The direction from the mounting portion to the tool holder is defined as the first direction, and the direction from the diamond cutting blade to the substrate is defined as the second direction. The first flank face extends from the side of the first mating surface away from the tool holder along the first direction and is inclined along the second direction.

5. The chamfering tool according to claim 4, characterized in that, The PCD composite sheet also includes a second rear cutting surface, which is disposed opposite to the first mating surface. The second rear cutting surface is connected to the side of the first rear cutting surface near the handle. The second rear cutting surface extends from the side of the first rear cutting surface near the handle along the first direction and is inclined along the second direction. The angle between the first rear cutting face and the rotation center axis of the chamfering cutter is greater than the angle between the second rear cutting face and the rotation center axis of the chamfering cutter.

6. The chamfering tool according to claim 5, characterized in that, The angle between the first flank face and the cutting plane of the chamfering tool is β, and the angle between the second flank face and the cutting plane of the chamfering tool is γ; It satisfies: β < γ, and 3° ≤ β ≤ 20°, 10° ≤ γ ≤ 40°.

7. The chamfering tool according to claim 1, characterized in that, The direction from the mounting portion to the tool holder is defined as the first direction, and the direction from the diamond cutting blade to the substrate is defined as the second direction. The PCD composite sheet also has a first clearance surface disposed opposite to the first mating surface. The first clearance surface extends from the tip of the chamfering edge along the first direction and is inclined along the second direction. The mounting part is also provided with a second clearance surface, which is located on the side of the first clearance surface away from the sharp corner of the chamfering edge.

8. The chamfering tool according to claim 1, characterized in that, The mounting part is also provided with a chip removal groove, which is disposed opposite to the second mating surface.

9. The chamfering tool according to claim 1, characterized in that, The first mating surface is welded to the second mating surface.

10. The chamfering tool according to claim 1, characterized in that, The outer wall of the mounting part is provided with a plurality of mounting grooves spaced apart along the circumference of the mounting part, and the number of PCD composite sheets is a plurality of them, with each of the plurality of PCD composite sheets being disposed in a corresponding manner in the plurality of mounting grooves.

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