A diamond cutting tool for machining hard, brittle and difficult-to-machine materials

Abstract

The present invention relates to the technical field of precision machining tools, and discloses a diamond cutting tool for machining hard, brittle and difficult-to-machine materials. The material of the cutting edge portion of the cutting tool is polycrystalline diamond, and the cutting edge portion includes an integrally formed cutting body and a plurality of cutting edges. The cutting edges are spiral, and each cutting edge is circumferentially arranged on the outer surface of the cutting body along the central axis of the cutting body, and a first chip removal groove is arranged between two adjacent cutting edges; the first end of the cutting edge is arranged on the front end face of the cutting body, and the second end of the cutting edge is arranged on the side of the cutting body. The beneficial effects of the present invention are: by integrally forming a cutting edge on the cutting body of polycrystalline diamond material, compared with traditional welded sheet PCD cutting tools, a larger number of cutting edges can be arranged on the cutting body of the same outer diameter, and the shape and structure of the cutting edge are more diversified, thereby improving the cutting effect and machining efficiency, and extending the service life.

Description

Technical Field

[0001] The invention relates to the technical field of precision machining tools, in particular to a diamond cutting tool for machining hard, brittle and difficult-to-machine materials. Background Art

[0002] At present, in the processing field of hard and brittle materials such as glass, ceramics or sapphire, it is necessary to process glass, ceramics or sapphire; accordingly, different types of cutting tools are needed.

[0003] Traditional cutting tools are generally made of high-speed steel or cemented carbide. PCD (Polycrystalline diamond) is a kind of artificial diamond, which has the characteristics of high hardness, high compressive strength, good thermal conductivity and wear resistance, and is therefore welcomed by the processing industry; with the popularization of PCD materials, PCD cutting tools have emerged, breaking through the limitations of traditional cutting tools.

[0004] Existing PCD cutting tools are made by cutting PCD into thin slices and then welding them to a cemented carbide cutting body as cutting edges. However, due to the limitations of the outer diameter of the cutting body and the welding process, welded sheet PCD cutting tools can usually only weld a very small number of PCD slices at most, such as making a 3-edge cutting tool or a 4-edge cutting tool, etc., and cannot make a multi-edge cutting tool, which limits the cutting effect of the cutting tool. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and structure, and to provide a cutting tool, its cutting edge portion and an ultrasonic tool assembly including the cutting tool. Compared with a welded PCD cutting tool, a larger number of cutting edges can be arranged on a polycrystalline diamond cutting body with the same outer diameter, and the form and structure of the cutting edge are more diversified, which can improve the cutting effect.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a cutting edge portion for a cutting tool, wherein the material of the cutting edge portion is polycrystalline diamond, and the cutting edge portion includes an integrally formed cutting body and a plurality of cutting edges, wherein the cutting edge is spiral, and each of the cutting edges is circumferentially arranged on the outer surface of the cutting body along the central axis of the cutting body, and a first chip groove is arranged between two adjacent cutting edges; the first end portion of the cutting edge is arranged on the front end face of the cutting body, and the cutting edge extends successively along the front end face of the cutting body and the side face of the cutting body, so that the second end portion of the cutting edge is arranged on the side face of the cutting body.

[0007] As a preferred solution, the cutting edge portion further comprises a wiper edge integrally formed on the cutting body, wherein the wiper edge is arranged at the first end portion of the cutting edge and smoothly transitions with the cutting edge.

[0008] As a preferred embodiment, the cutting body includes a cutting body end and a connecting portion fixedly connected by an end face, the first end of the cutting edge is arranged at the front end face of the cutting body end, and the cutting edge extends successively along the front end face of the cutting body end and the side face of the cutting body end, so that the second end of the cutting edge is arranged on the side face of the cutting body end, and the second end of the cutting edge is located at the connection between the cutting body end and the connecting portion.

[0009] As a preferred solution, the end of the cutting body includes a first cutting portion and a second cutting portion which are coaxial, fixedly connected and step-shaped, the outer diameter of the first cutting portion is smaller than the outer diameter of the second cutting portion, and the second cutting portion is fixedly connected to the connecting portion.

[0010] As a preferred solution, arc transition connections are adopted between the front end face of the first cutting portion and its side face, between the first cutting portion and the second cutting portion, and between the front end face of the second cutting portion and its side face.

[0011] As a preferred solution, a cooling groove is provided at the center of the front end surface of the cutting body, and the first end of the cutting edge is provided at the outer edge of the cooling groove.

[0012] As a preferred solution, the helical direction of the cutting edge is left-handed or right-handed, and the helical angle of the cutting edge is 15° to 60°.

[0013] As a preferred solution, the outer diameter of the cutting body is 0.5 mm to 135 mm, the number of the cutting edges is determined by the width of the cutting edges, the width of the cutting edges is 0.01 mm to 0.2 mm, and the length of the cutting edges is 0.1 mm to 15 mm.

[0014] As a preferred solution, the groove depth of the first chip removal groove is 0.05 mm to 0.3 mm.

[0015] As a preferred solution, the blade length of the wiper blade is 0.01 mm to 3 mm.

[0016] As a preferred embodiment, the cutting body is provided with a plurality of second spiral chip grooves in the opposite direction to the cutting edge, the second chip grooves extend from the front end face of the cutting body to its side face, and each of the second chip grooves is arranged circumferentially along the center axis of the cutting body; the second chip grooves divide each of the cutting edges into a plurality of sections.

[0017] As a preferred solution, the helix angle of the second chip removal groove is 20° to 40°.

[0018] As a preferred solution, the interval between two adjacent second chip removal grooves is 0.25 mm to 0.75 mm, and the groove depth of the second chip removal groove is 0.05 mm to 0.15 mm.

[0019] As a preferred solution, the cutting edge portion further comprises a matrix, the matrix is ​​fixedly connected to the rear end face of the cutting body, and the material of the matrix is ​​tungsten carbide-based cemented carbide.

[0020] For the same purpose, the second aspect of the present invention provides a cutting tool, which includes a tool shank and a cutting edge portion as described above installed at the front end of the tool shank, and the tool shank is connected to the rear end face of the cutting body.

[0021] As a preferred embodiment, the tool shank is made of tungsten carbide-based cemented carbide, the cutting edge portion also includes a substrate, the substrate is fixedly connected to the rear end face of the cutting body, and the substrate is made of tungsten carbide-based cemented carbide; the tool shank and the rear end face of the substrate are vacuum welded.

[0022] Similarly, the third aspect of the present invention also provides an ultrasonic tool assembly, which includes the cutting tool as described above.

[0023] The present invention provides a cutting tool, a cutting edge portion of the cutting tool, and an ultrasonic tool assembly including the cutting tool, which have the following beneficial effects compared to the prior art:

[0024] The cutting edge portion is made of polycrystalline diamond material, which can effectively improve the hardness and strength of the cutting edge, improve processing accuracy and processing efficiency; and the cutting edge of the cutting edge portion is arranged on the surface of the cutting body through integral molding. Compared with the welded sheet PCD cutting tool, more cutting edges can be formed on the polycrystalline diamond cutting body with the same outer diameter, and the form and structure of the cutting edge are more diversified; furthermore, several cutting edges are distributed circumferentially along the central axis of the cutting body, and multiple cutting edges can jointly withstand a large cutting force to ensure strength, and the cutting edge is spiral, which can weaken the cutting force on each cutting edge, and can adapt to higher cutting speeds and larger feed rates to improve processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a cutting edge portion in an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0027] Figure 3 yes Figure 1 A partial enlarged view of part B;

[0028] Figure 4 is a schematic structural diagram of the end portion of the cutting body of the cutting edge portion in an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the side profile of the cutting edge and the wiper edge of the cutting edge portion in an embodiment of the present invention;

[0030] Figure 6 is a schematic structural diagram of a cutting tool in an embodiment of the present invention;

[0031] Figure 7 is a schematic structural diagram of a cutting tool in another viewing angle in an embodiment of the present invention;

[0032] Figure 8 yes Figure 7 Top view of the .

[0033] In the figure, 1, cutting edge portion; 11, cutting body; 111, cutting body end portion; 1111, first cutting portion; 1112, second cutting portion; 112, connecting portion; 12, cutting edge; 13, first chip groove; 14, cooling groove; 15, second chip groove; 16, base; 17, wiper edge; 2, tool shank portion. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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 of the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0036] In addition, it should be noted that in the description of the present invention, the terms "front end" and "rear end" mean that when the cutting tool is in use, the end close to the workpiece is the "front end" and the end away from the workpiece is the "rear end".

[0037] See attached Figure 1-Figure 5As shown, a first aspect of a preferred embodiment of the present invention proposes a cutting edge portion 1 for a cutting tool, wherein the material of the cutting edge portion 1 is polycrystalline diamond, and the cutting edge portion 1 includes an integrally formed cutting body 11 and a plurality of cutting edges 12, wherein the cutting edges 12 are spiral, and each of the cutting edges 12 is circumferentially arranged on the outer surface of the cutting body 11 along the central axis of the cutting body 11, and a first chip groove 13 is arranged between two adjacent cutting edges 12; the first end portion of the cutting edge 12 is arranged on the front end face of the cutting body 11, and the cutting edge 12 extends along the front end face of the cutting body 11 and the side face of the cutting body 11 in sequence, so that the second end portion of the cutting edge 12 is arranged on the side face of the cutting body.

[0038] During the machining process, the cutting edge portion 1 rotates to drive the cutting edges 12 to rotate, thereby removing material from the workpiece. Waste chips generated during the cutting process are discharged from the first chip removal groove 13, thereby avoiding the adverse effects of the waste chips on the machining process.

[0039] Based on the above technical scheme, a cutting edge portion 1 for a cutting tool is provided in the present embodiment, which is made of polycrystalline diamond material, and the cutting body 11 and the cutting edge 12 are integrally formed. Compared with the existing welded sheet PCD cutting tool, a larger number of cutting edges 12 can be arranged on the cutting body 11 with the same outer diameter, and the form and structure of the cutting edge 12 are more diversified; at the same time, the problem of insufficient strength caused by welding the PCD sheet to the cutting body can be avoided, and the characteristics of the polycrystalline diamond material can be fully utilized to improve the cutting strength of the cutting edge portion 1, thereby effectively improving the cutting accuracy and cutting work efficiency, and can extend the service life of the cutting tool; in the present embodiment, the cutting edge 12 with a spiral contour shape is designed to adapt to higher cutting speeds and feed rates, thereby further improving the processing efficiency.

[0040] Exemplarily, in this embodiment, the method of integrally forming the cutting body 11 and the cutting edge 12 mainly includes two categories: the first category is cumulative material forming, such as casting, additive manufacturing, etc.; the other category is to form the cutting edge 12 on the blank of the cutting body 11 after removing material, such as milling, electric spark cutting, laser cutting, chemical corrosion, etc.

[0041] As an optional embodiment, the cutting edge portion 1 is a milling cutter, which can be used to mill a processing object to form a desired contour. Specifically, the processing object is mainly a glass product, a ceramic product or a sapphire product.

[0042] For details, please refer to the attached Figure 3As shown, the cutting edge portion 1 further includes a wiper edge 17 integrally formed on the cutting body 11, the wiper edge 17 is arranged at the first end portion of the cutting edge 12 and smoothly transitions with the cutting edge 12, the wiper edge 17 is arranged on the front end surface of the cutting edge portion 1, and can remove the machining marks on the workpiece to improve the surface smoothness, preferably, the wiper edge 17 is tangent to the cutting edge 12, and the wiper edge 17 is nearly horizontally arranged; refer to the attached Figure 5 As shown, one end of the wiper edge 17 is free, and the angle α in the figure is an obtuse angle, which can prevent stress concentration, and the other end of the wiper edge 17 is tangent to the cutting edge 12 .

[0043] In a specific embodiment, the cutting body 11 includes a cutting body end 111 and a connecting portion 112 fixedly connected by an end face, the first end of the cutting edge 12 is arranged at the front end face of the cutting body end 111, and the cutting edge 12 extends along the front end face of the cutting body end 111 and the side face of the cutting body end 111 in sequence, so that the second end of the cutting edge 12 is arranged on the side face of the cutting body end 111, and the second end of the cutting edge 12 is located at the connection between the cutting body end 111 and the connecting portion 112; only covering the cutting edge 12 on the outer surface of the cutting body end 111 can meet the cutting requirements and simplify the processing of the cutting edge 12.

[0044] Further, see Figure 1 and Figure 4 It can be seen that the cutting body end 111 includes a first cutting portion 1111 and a second cutting portion 1112 which are coaxial, fixedly connected and step-shaped. The outer diameter of the first cutting portion 1111 is smaller than the outer diameter of the second cutting portion 1112. The second cutting portion 1112 is fixedly connected to the connecting portion 112. The first end of the cutting edge 12 is arranged at the front end face of the first cutting portion 1111, and the cutting edge 12 extends along the front end face of the first cutting portion 1111, the side face of the first cutting portion 1111, the protruding part of the front end face of the second cutting portion 1112, and the side face of the second cutting portion 1112 in sequence, so that the second end of the cutting edge 12 is arranged on the side face of the second cutting portion 1112. Since the contour line of the cutting edge 12 is more complex, it can meet the situation with more stringent requirements on processing accuracy and improve the cutting ability.

[0045] In order to avoid chipping of the workpiece during machining, arc transition connections are used between the front end face and the side face of the first cutting portion 1111, between the first cutting portion 1111 and the second cutting portion 1112, and between the front end face and the side face of the second cutting portion 1112. Figure 3It can be seen that in the longitudinal cross-section of the cutting body 11, the contour line of its side is a curve including multiple arcs and straight lines, so that the cutting edge 12 formed on the surface of the cutting body 11 is a spline curve composed of multiple arcs and straight lines. The shape of the cutting edge 12 is more complex and is suitable for processing workpieces with brittle materials.

[0046] Preferably, in this embodiment, a cooling groove 14 is opened at the center of the front end face of the cutting body 11, and the first end of the cutting edge 12 is arranged at the outer edge of the cooling groove 14; the cooling groove 14 can cool the cutting edge 12, effectively reducing the thermal damage of the cutting edge 12, and the cooling groove 14 is arranged at the center of the front end face of the cutting body 11, which can make the cooling of the cooling groove 14 more uniform and the cooling effect ideal.

[0047] Furthermore, the spiral direction of the cutting edge 12 in this embodiment can be left-handed or right-handed.

[0048] Preferably, in this embodiment, the helix angle of the cutting edge 12 is 15° to 60°. Properly increasing the helix angle can reduce the cutting force of the tool during the processing, increase the impact resistance of the tool, prevent tool vibration, ensure better surface processing quality, and increase the service life of the cutting tool. Based on the above-mentioned helix angle, the strength, sharpness, cutting force and waste chip discharge speed of the cutting edge 12 are all ideal.

[0049] Further, as a preferred embodiment, the outer diameter of the cutting body 11 of the cutting edge portion 1 is 0.5㎜~135㎜, and the number of the cutting edges 12 is determined by the blade width of the cutting edge 12. When the outer diameter of the cutting body 11 is determined, the smaller the blade width of the cutting edge 12, the greater the number of cutting edges 12; the blade width of the cutting edge 12 is 0.01㎜~0.2㎜, and the blade length of the cutting edge 12 is 0.1㎜~15㎜. Based on the above definition of the outer diameter of the cutting body 11 and the blade width of the cutting edge 12, 3 to 150 or even more cutting edges 12 can be set on the cutting edge portion 1. Specifically, in this embodiment, the blade width of the cutting edge 12 refers to the distance between the two side surfaces of the cutting edge 12, as shown in the attached Figure 2 The a indicated in the figure is the width of the cutting edge, and the length of the cutting edge 12 refers to the distance between one end of the cutting edge 12 located on the side of the cutting body 11 and the front end of the cutting body 11. Figure 4 and Figure 5The L marked in the figure is the length of the cutting edge 12. Properly increasing the number of cutting edges 12 can evenly distribute the cutting force to each cutting edge 12, so that the cutting tool can withstand greater cutting force and adapt to higher cutting speeds and feed rates. Reducing the blade width will improve the processing accuracy. The blade length determines the effective range of the cutting edge 12. By using the above-mentioned matching number of cutting edges 12, blade width and blade length, the cutting tool can have ideal processing accuracy while ensuring processing efficiency.

[0050] Furthermore, the surface roughness of the cutting edge 12 is in the range of 0.2 to 0.4 μm, and the smaller the value, the smoother it is. Under the aforementioned surface roughness, the cutting edge of the cutting edge 12 is smooth and sharp, so that the surface accuracy of the object being cut can be guaranteed.

[0051] Specifically, the depth of the first chip groove 13 should match the width and length of the corresponding cutting edge 12. Based on the width and length of the above-mentioned cutting edge 12, the depth of the first chip groove 13 is preferably 0.05 mm to 0.3 mm, so that the processing accuracy and processing effect are better, and the service life of the cutting tool can be extended while improving the processing efficiency.

[0052] In a specific embodiment, the blade length of the above-mentioned polishing blade 17 is 0.01 mm to 3 mm. Figure 3 and Figure 5 As shown, the edge length of the wiper edge 17 refers to a projected length b of the wiper edge 17 along the radial direction of the cutting body 11 .

[0053] In order to improve the chip removal efficiency and thus improve the processing efficiency of the cutting tool, the cutting body 11 is provided with a plurality of spiral second chip removal grooves 15 in the opposite direction to the cutting edge 12. The second chip removal grooves 15 extend from the front end surface of the cutting body 11 to its side surface. Each of the second chip removal grooves 15 is arranged circumferentially along the central axis of the cutting body 11. The second chip removal grooves 15 divide each of the cutting edges 12 into a plurality of sections. For details, see the attached Figure 2 It is knowable.

[0054] Specifically, the relevant parameters of the second chip groove 15 match the parameters of the above-mentioned cutting edge 12. The specific parameters of the second chip groove 15 in this embodiment are preferably: the helix angle of the second chip groove 15 is 20°~40°, the interval between two adjacent second chip grooves 15 is 0.25㎜~0.75㎜, and the groove depth of the second chip groove 15 is less than or equal to the blade width of the cutting edge, specifically 0.05㎜~0.15㎜.

[0055] In order to facilitate molding, the cutting edge portion 1 also includes a matrix 16, which is fixedly connected to the rear end face of the cutting body 11, and the material of the matrix 16 is tungsten carbide-based cemented carbide. Exemplarily, the specific molding process of the cutting edge portion 1 is: first, the matrix 16 of tungsten carbide-based cemented carbide is used as a substrate, and natural or diamond powder and a binder are sintered on the matrix 16 at high temperature (1000℃~2000℃) and high pressure (50,000~100,000 atmospheres) to form the cutting body 11, and then the cutting edge 12 is formed on the outer surface of the cutting body 11 after material removal processing.

[0056] The second aspect of this embodiment further provides a cutting tool, Figure 5-Figure 7 As shown, it includes a tool shank 2 and the cutting edge portion 1 as mentioned above installed on the front end of the tool shank 2, and the tool shank 2 is connected to the rear end face of the cutting body 11; since it includes the cutting edge portion 1 mentioned above, it is an integral PCD cutting tool and has all the beneficial effects of the cutting edge portion 1 mentioned above, which are not stated one by one here.

[0057] Preferably, the tool shank 2 is made of tungsten carbide-based cemented carbide, the cutting edge portion 1 further comprises a matrix 16, the matrix 16 is made of tungsten carbide-based cemented carbide, the matrix 16 is fixedly connected to the rear end face of the cutting body 11; the tool shank 2 is vacuum welded to the rear end face of the matrix 16. In view of this, since the matrix 16 of the cutting edge portion 1 and the tool shank 2 are made of the same tungsten carbide-based cemented carbide material, they have the same material properties, and the deformation of the matrix 16 and the tool shank 2 during butt welding is close, making the welding structure stability more ideal to ensure welding strength.

[0058] Exemplarily, the tool handle 2 and the base 16 are welded by a silver soldering layer; wherein the silver soldering layer is formed by solidifying a silver solder, which melts during the welding process to connect the base 16 and the tool handle 2, and fixes the latter two after solidification; specifically, the silver soldering material is formed by combining silver as a base material with other alloys. In this embodiment, due to the provision of the silver soldering layer, the tool handle 2 and the base 16 can have a better welding and fixing effect.

[0059] Exemplarily, the tungsten carbide-based cemented carbide used in the above-mentioned substrate 16 and the tool handle 2 are sintered materials composed of tungsten carbide as a hard phase and a metal bonding phase; further, the mass percentage of cobalt in the sintered material does not exceed 12%.

[0060] In a specific embodiment, the contour of the cutting tool is less than 0.01 mm; wherein the contour refers to the change of the actual contour measured relative to the ideal contour, which may be with or without a benchmark; the limitation of the contour of the cutting tool can further enable the cutting tool to have better processing accuracy and processing effect.

[0061] The third aspect of the preferred embodiment of the present invention further proposes an ultrasonic tool assembly, which includes the cutting tool mentioned above. Since it includes the cutting tool mentioned above, it has all the beneficial effects of the cutting tool mentioned above, which are not listed one by one here.

[0062] Embodiment 1

[0063] Specific embodiment 1 provides a cutting tool, wherein the chip edge portion 1 includes 60 cutting edges 12 .

[0064] Under the limitation of the number of the above-mentioned cutting edges 12, the above-mentioned cutting tool is used to process glass, and the comparison of its use parameters and service life with the existing welded PCD cutting tool (including 3 cutting edges) and diamond grinding head (600#) is shown in the following table.

[0065]

[0066]

[0067] Under the limitation of the number of the above-mentioned cutting edges 12, the above-mentioned cutting tool is used to process the ceramic workpiece. The comparison of the use parameters and service life of the above-mentioned cutting tool with the existing welded PCD cutting tool (including 3 cutting edges) and diamond grinding head (600#) is shown in the following table.

[0068]

[0069] Under the limitation of the number of the above-mentioned cutting edges 12, the above-mentioned cutting tool is used to perform end face finishing on sapphire. The comparison of its use parameters and service life with the existing welded PCD cutting tool (including 3 cutting edges) and diamond grinding head (600#) is shown in the following table.

[0070]

[0071]

[0072] It can be seen from the above three tables that, under the limited conditions based on the above-mentioned cutting edge 12, the cutting tool in this embodiment has a more superior processing effect, higher processing efficiency and longer service life when processing glass, ceramic and sapphire workpieces than the existing welded PCD cutting tools and commonly used diamond grinding heads.

[0073] Embodiment 2

[0074] Specific embodiment 2 provides a cutting tool, wherein the cutting edge portion 1 includes 70 cutting edges 12, the helix angle of the cutting edge 12 is 58°, the edge width of the cutting edge 12 is 0.10 mm, the edge length of the cutting edge 12 is 2 mm, and the surface roughness of the cutting edge 12 is 0.3 μm; the groove depth of the first chip groove 13 is 0.10 mm; the helix angle of the second chip groove 15 is 26°, the groove depth of the second chip groove 15 is 0.10 mm, and the interval between two adjacent second chip grooves 15 is 0.55 mm.

[0075] Under the limited conditions based on the above parameters, the cutting tool in the embodiment of the present invention can achieve better processing accuracy and processing effect, higher processing efficiency, and longer service life than traditional carbide cutting tools and existing welded PCD cutting tools.

[0076] Embodiment 3

[0077] This specific embodiment provides a cutting tool, which includes 80 cutting edges 12, the helix angle of the cutting edge 12 is 52°, the edge width of the cutting edge 12 is 0.06mm, the edge length of the cutting edge 12 is 1.6mm, and the surface roughness of the cutting edge 12 is 0.2μm; the groove depth of the first chip groove 13 is 0.08mm; the helix angle of the second chip groove 15 is 22°, the groove depth of the second chip groove 15 is 0.08mm, and the interval between two adjacent second chip grooves 15 is 0.40mm.

[0078] Under the limited conditions based on the above parameters, the cutting tool in the embodiment of the present invention has a superior processing effect, higher processing accuracy, higher processing efficiency, and a longer service life than traditional cemented carbide cutting tools and existing welded PCD cutting tools.

[0079] Embodiment 4

[0080] The present embodiment provides a cutting tool, which includes 64 cutting edges 12, the helix angle of the cutting edge 12 is 66°, the edge width of the cutting edge 12 is 0.14 mm, the edge length of the cutting edge 12 is 2.8 mm, and the surface roughness of the cutting edge 12 is 0.36 μm; the groove depth of the first chip groove 13 is 0.12 mm; the helix angle of the second chip groove 15 is 38°, the groove depth of the second chip groove 15 is 0.12 mm, and the interval between two adjacent second chip grooves 15 is 0.65 mm.

[0081] Under the limited conditions based on the above parameters, the cutting tool in the embodiment of the present invention has a more superior processing effect, higher processing accuracy, higher processing efficiency, and a longer service life than traditional carbide cutting tools and existing welded PCD cutting tools.

[0082] In summary, an embodiment of the present invention provides a cutting tool, its cutting edge portion 1 and an ultrasonic tool assembly including the cutting tool. The cutting edge portion 1 of the cutting tool is made of polycrystalline diamond, and a plurality of cutting edges 12 are integrally formed and arranged on the outer surface of a cutting body 11 to form the cutting edge portion 1. Compared with the existing welded sheet PCD cutting tool, a larger number of cutting edges 12 can be arranged on a cutting body 11 with the same outer diameter, and the form and structure of the cutting edge 12 are more diversified. By arranging a plurality of polycrystalline diamond cutting edges 12, the cutting strength and hardness of the cutting tool can be improved, thereby improving the machining accuracy of the cutting tool and extending its service life. The surface of the cutting edge portion 1 is provided with a plurality of spiral cutting edges 12 circumferentially along its central axis, which can adapt to a higher rotation speed and cutting amount, thereby improving machining efficiency.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A cutting edge portion for a cutting tool, characterized in that: The material of the cutting edge portion is polycrystalline diamond, and the cutting edge portion includes an integrally formed cutting body and a plurality of cutting edges, the cutting edges are spiral, and each of the cutting edges is circumferentially arranged on the outer surface of the cutting body along the central axis of the cutting body, and a first chip removal groove is arranged between two adjacent cutting edges; The first end of the cutting edge is disposed on the front end face of the cutting body, and the cutting edge extends along the front end face of the cutting body and the side face of the cutting body in sequence, so that the second end of the cutting edge is disposed on the side face of the cutting body; The cutting body is provided with a plurality of second spiral chip removal grooves in the opposite direction to the cutting edge, the second chip removal grooves extending from the front end surface of the cutting body to the side surface thereof, and each of the second chip removal grooves is arranged circumferentially along the central axis of the cutting body; the second chip removal grooves divide each of the cutting edges into a plurality of sections; In the longitudinal section of the cutting body, the contour line of the side surface of the cutting body includes a curve connected by multiple arcs and straight lines; The cutting body comprises a cutting body end portion and a connecting portion fixedly connected by an end face; the cutting body end portion comprises a first cutting portion and a second cutting portion which are coaxial and fixedly connected and form a step shape, the outer diameter of the first cutting portion is smaller than the outer diameter of the second cutting portion, and the second cutting portion is fixedly connected to the connecting portion; The outer diameter of the cutting body is 0.5 mm to 135 mm, the number of the cutting edges is determined by the width of the cutting edges, the width of the cutting edges is 0.01 mm to 0.2 mm, the length of the cutting edges is 0.1 mm to 15 mm, and the number of the cutting edges is 60 to 150; It also includes a wiper edge integrally formed on the cutting body, the wiper edge is arranged at the first end of the cutting edge and smoothly transitions with the cutting edge, and the outer side surface of the wiper edge is tangent to the outer side surface of the cutting edge; The blade length of the wiper blade is 0.01 mm to 3 mm.

2. The cutting edge portion according to claim 1, wherein: The first end of the cutting edge is arranged at the front end face of the cutting body end, and the cutting edge extends along the front end face of the cutting body end and the side face of the cutting body end in sequence, so that the second end of the cutting edge is arranged on the side face of the cutting body end, and the second end of the cutting edge is located at the connection between the cutting body end and the connecting portion.

3. The cutting edge portion according to claim 2, wherein: Arc transition connections are adopted between the front end face of the first cutting portion and its side face, between the first cutting portion and the second cutting portion, and between the front end face of the second cutting portion and its side face.

4. The cutting edge portion according to claim 1, wherein: A cooling groove is provided at the center of the front end surface of the cutting body, and the first end of the cutting edge is arranged at the outer edge of the cooling groove.

5. The cutting edge portion according to claim 1, wherein: The helical direction of the cutting edge is left-handed or right-handed, and the helical angle of the cutting edge is 15° to 60°.

6. The cutting edge portion according to claim 1, wherein: The groove depth of the first chip removal groove is 0.05mm~0.3mm.

7. The cutting edge portion according to claim 1, wherein: The helix angle of the second chip removal groove is 20°~40°.

8. The cutting edge portion according to claim 1, wherein: The interval between two adjacent second chip removal grooves is 0.25 mm to 0.75 mm; the groove depth of the second chip removal groove is 0.05 mm to 0.15 mm.

9. The cutting edge portion according to any one of claims 1 to 8, characterized in that: It also includes a matrix, which is fixedly connected to the rear end face of the cutting body, and the material of the matrix is ​​tungsten carbide-based cemented carbide.

10. A cutting tool, characterized in that: It comprises a tool shank and a cutting edge portion as described in any one of claims 1 to 9 installed at the front end of the tool shank, and the tool shank is connected to the rear end face of the cutting body.

11. The cutting tool according to claim 10, characterized in that The tool shank is made of tungsten carbide-based cemented carbide, and the cutting edge also includes a substrate, which is fixedly connected to the rear end face of the cutting body. The substrate is made of tungsten carbide-based cemented carbide; the tool shank is vacuum welded to the rear end face of the substrate.

12. An ultrasonic tool assembly, characterized in that: Comprising a cutting tool as claimed in claim 10 or 11.

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