WO2020063006A1

WO2020063006A1 - Diamond cutting tool for hard-brittle difficult-to-machine material

Info

Publication number: WO2020063006A1
Application number: PCT/CN2019/094444
Authority: WO
Inventors: 李伟秋; 颜炳姜
Original assignee: 汇专科技集团股份有限公司
Priority date: 2018-09-25
Filing date: 2019-07-02
Publication date: 2020-04-02
Also published as: KR20210034663A; JP7112584B2; JP2021530372A

Abstract

Disclosed is a diamond cutting tool. Made of polycrystalline diamond, a cutting edge part (1) comprises an integrally-formed cutting body (11) and a plurality of cutting edges (12); the cutting edges (12) are spiral-shaped and circumferentially arranged on the outer surface of the cutting body (11) along the central axis of the cutting body (11); a first shavings outlet groove (13) is formed between every two adjacent cutting edges (12); a first end portion of each cutting edge (12) is arranged at the front end surface of the cutting body (11); and a second end portion of each cutting edge (12) is arranged on the side surface of the cutting body (11).

Description

Diamond cutting tool for processing hard and brittle materials

Technical field

The invention relates to the technical field of precision machining tools, in particular to a diamond cutting tool for processing hard and brittle materials.

Background technique

At present, in the field of processing hard, brittle materials such as glass, ceramics, or sapphire, glass, ceramics, or sapphire need to be processed; accordingly, different types of cutting tools are required.

Traditional cutting tools are generally made of high-speed steel or hard alloy materials. PCD (Polycrystalline diamond) is a kind of artificial diamond with high hardness, high compressive strength, good thermal conductivity and abrasion resistance, so it is welcomed by the processing industry. With the popularity of PCD materials, PCD cutting With the advent of tools, the limitations of traditional cutting tools have been broken.

The existing PCD cutting tool is to cut PCD into thin slices and then weld it to the cutting body of cemented carbide as the cutting edge. However, due to the limitation of the outer diameter of the cutting body and the welding process, the pad type PCD cutting tool is usually limited to at most. PCD wafers with a very small number of welds, such as manufactured as 3-edge cutting tools or 4-edge cutting tools, cannot be used to produce multi-edge cutting tools, which limits the cutting effect of cutting tools.

Summary of the Invention

The object of the present invention is to overcome the shortcomings of the existing technology and structure, and provide a cutting tool, a cutting edge portion thereof, and an ultrasonic tool assembly including the cutting tool. The polycrystalline diamond cutting body is provided with a larger number of cutting edges, the form and structure of the cutting edges are more diversified, and the cutting effect can be improved.

In order to achieve the above object, a first aspect of the present invention provides a cutting edge portion for a cutting tool, 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 helical, and each of the cutting edges is provided on the outer surface of the cutting body along the center axis of the cutting body, and a first chip discharge groove is provided between two adjacent cutting edges. A first end portion of the cutting edge is provided on a front end surface of the cutting body, and the cutting edge extends along the front end surface of the cutting body and a side surface of the cutting body in order, so that the first The two ends are provided on the side of the cutting body.

As a preferred solution, the cutting edge portion further includes a smoothing edge integrally formed on the cutting body, and the smoothing edge is disposed at a first end portion of the cutting edge and smoothly transitions with the cutting edge.

As a preferred solution, the cutting body includes a cutting body end portion and a connecting portion fixedly connected through one end surface, a first end portion of the cutting edge is provided on a front end surface of the cutting body end portion, and the cutting edges are in turn Extending along the front end surface of the cutting body end portion and the side surface of the cutting body end portion, so that the second end portion of the cutting edge is provided on the side surface of the cutting body end portion, and the second edge of the cutting edge An end portion is located at a connection between the end portion of the cutting body and the connection portion.

As a preferred solution, the end of the cutting body includes a first cutting portion and a second cutting portion that are coaxially and fixedly connected to form a step, and an outer diameter of the first cutting portion is smaller than an outer diameter of the second cutting portion. The second cutting portion is fixedly connected to the connecting portion.

As a preferred solution, a circle is used between the front end surface of the first cutting portion and its side surface, between the first cutting portion and the second cutting portion, and between the front end surface of the second cutting portion and its side surface. Arc transition connection.

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

As a preferred solution, the spiral direction of the cutting edge is left-handed or right-handed, and the spiral angle of the cutting edge is 15 ° -60 °.

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

As a preferred solution, the groove depth of the first chip discharge groove is 0.05 ㎜ to 0.3 ㎜.

As a preferred solution, the blade length of the smoothing blade is 0.01 ㎜ to 3 ㎜.

As a preferred solution, the cutting body is provided with a plurality of spiral second chip evacuation grooves opposite to the cutting edge direction, and the second chip evacuation grooves extend from a front end surface of the cutting body to a side surface thereof, each The second chip evacuation groove is provided along a circumferential direction of the central axis of the cutting body; the second chip evacuation groove separates each of the cutting edges into a plurality of segments.

As a preferred solution, a spiral angle of the second chip discharge groove is 20 ° to 40 °.

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

As a preferred solution, the cutting edge portion further includes a base body, the base body is fixedly connected to the rear end surface of the cutting body, and the material of the base body is a tungsten carbide-based hard alloy.

For the same purpose, a second aspect of the present invention provides a cutting tool, which includes a tool shank and the cutting edge portion as described above mounted on the front end of the tool shank, the tool shank and the cutting body Rear end connection.

As a preferred solution, the material of the tool shank is tungsten carbide-based hard alloy, the cutting edge portion further includes a base body, and the base body is fixedly connected to the rear end face of the cutting body, and the material of the base body is tungsten carbide. Base cemented carbide; the tool shank and the rear end surface of the base body are vacuum welded.

Similarly, the third aspect of the present invention also provides an ultrasonic tool assembly including the cutting tool as described above.

The present invention provides a cutting tool, a cutting edge portion of a cutting tool, and an ultrasonic tool assembly including the cutting tool. Compared with the prior art, it has the following beneficial effects:

The cutting edge part is made of polycrystalline diamond material, which can effectively improve the hardness and strength of the cutting edge, improve the machining accuracy and processing efficiency; and the cutting edge of the cutting edge part is provided on the surface of the cutting body through integral molding, which is opposite to the welding sheet The PCD cutting tool can form a larger number of cutting edges on the polycrystalline diamond cutting body with the same outer diameter, and the form and structure design of the cutting edge are more diversified. Furthermore, several cutting edges are along the central axis of the cutting body. Circumferentially distributed, multiple cutting edges can bear large cutting forces together to ensure strength, and the cutting edges are helical, which can weaken the cutting force on each cutting edge, and can adapt to higher cutting speeds and larger feeds Volume to improve processing efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

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

2 is a partially enlarged view of part A of FIG. 1;

3 is a partially enlarged view of part B of FIG. 1;

4 is a schematic structural view of a cutting body end portion of a cutting edge portion in an embodiment of the present invention;

5 is a schematic diagram of a contour of a cutting edge and a smoothing edge of a cutting edge portion on a side in an embodiment of the present invention;

6 is a schematic structural diagram of a cutting tool according to an embodiment of the present invention;

7 is a schematic structural diagram of a cutting tool in another perspective of the embodiment of the present invention;

FIG. 8 is a plan view of FIG. 7.

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 row Chip flutes; 14, cooling flutes; 15, second chip flutes; 16, base; 17, smoothing blades; 2, tool shanks.

detailed description

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom" and the like are based on the drawings The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various kinds of information, but the information should not be limited to these terms, these terms 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 "second" information, and similarly, the "second" information may also be referred to as "first" information.

In addition, it should be noted that in the description of the present invention, the terms "front end" and "rear end" refer to the end of the cutting tool that is close to the processing workpiece during use, and the end that is away from the processing workpiece is "rear end".

1 to 5, a first aspect of a preferred embodiment of the present invention provides a cutting edge portion 1 for a cutting tool. The material of the cutting edge portion 1 is polycrystalline diamond, and the cutting edge portion 1 The cutting body 11 includes an integrally formed cutting body 11 and a plurality of cutting edges 12. The cutting edges 12 are spiral. Each of the cutting edges 12 is provided on the outer surface of the cutting body 11 along the center axis of the cutting body 11. A first chip discharge groove 13 is provided between two adjacent cutting edges 12; a first end portion of the cutting edge 12 is provided on a front end surface of the cutting body 11, and the cutting edges 12 are sequentially along A front end surface of the cutting body 11 and a side surface of the cutting body 11 are extended, and a second end portion of the cutting edge 12 is provided on a side surface of the cutting body.

During the machining process, the rotation of the cutting edge portion 1 drives each of the cutting edges 12 to rotate, and the material of the machining workpiece is removed. The waste chips generated during the cutting process are discharged from the first chip discharge groove 13, which can avoid the waste generated by the machining process. Negative Effects.

Based on the above technical solution, the present embodiment provides a cutting edge portion 1 for a cutting tool, which is made of polycrystalline diamond material, and the cutting main body 11 and the cutting edge 12 are integrally formed. Compared with the existing welding sheet, The PCD cutting tool can be provided with a larger number of cutting edges 12 on the cutting body 11 with the same outer diameter, and the form and structure of the cutting edges 12 are more diversified. At the same time, it is possible to avoid welding the PCD sheet to the cutting body. The problem of insufficient strength can make full use of the characteristics of the polycrystalline diamond material to improve the cutting strength of the cutting edge portion 1, thereby effectively improving the cutting accuracy and cutting work efficiency, and extending the service life of the cutting tool. In this embodiment, The cutting edge 12 with a spiral shape is designed to adapt to higher cutting speeds and feeds, further improving machining efficiency.

Exemplarily, in this embodiment, the method of integrally forming the cutting body 11 and the cutting edge 12 mainly includes two categories: the first type is the accumulation of material molding, such as casting, additive manufacturing, etc .; the other is the cutting body After cutting the material on the blank of 11 to form a cutting edge 12, such as milling, electric spark cutting, laser cutting, chemical corrosion, etc.

As an optional implementation manner, the cutting edge portion 1 is a milling cutter, and can be specifically used for milling a processing object to form a contour required. Specifically, the processing object is mainly a glass product, a ceramic product, or a sapphire product. Wait.

Referring specifically to FIG. 3, the cutting edge portion 1 further includes a trimming edge 17 integrally formed on the cutting body 11. The trimming edge 17 is disposed at a first end portion of the cutting edge 12 and is connected to the cutting edge 12. The cutting edge 12 transitions smoothly, and the smoothing edge 17 is disposed on the front end surface of the cutting edge portion 1, which can remove the machining blade pattern on the workpiece and improve the surface smoothness. Preferably, the smoothing edge 17 is tangent to the cutting edge 12 And the trimming blade 17 is close to a horizontal setting; as shown in FIG. 5, one end of the trimming blade 17 is evacuated, and the angle α in the illustration is an obtuse angle, which can prevent stress concentration. The cutting edges 12 are arranged tangentially.

In a specific embodiment, the cutting body 11 includes a cutting body end portion 111 and a connecting portion 112 fixedly connected through one end surface, and a first end portion of the cutting edge 12 is provided on a front end surface of the cutting body end portion 111. And the cutting edge 12 extends along the front end surface of the cutting body end portion 111 and the side surface of the cutting body end portion 111 in order, so that the second end portion of the cutting edge 12 is provided on the cutting body end portion 111. Side of the cutting edge 12, 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 the cutting edge 12 is covered on the outer surface of the cutting body end 111, which can satisfy Cutting requirements and simplify the machining of the cutting edge 12.

Further, referring to FIG. 1 and FIG. 4, it can be known that the cutting body end portion 111 includes a first cutting portion 1111 and a second cutting portion 1112 which are coaxially and fixedly connected and formed in a step shape. The outer diameter 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 portion of the cutting edge 12 is provided on the first cutting portion 1111. A front end surface, and the cutting edge 12 along the front end surface of the first cutting portion 1111, the side surface of the first cutting portion 1111, the protruding portion of the front end surface of the second cutting portion 1112, and the The side of the second cutting portion 1112 extends so that the second end portion of the cutting edge 12 is provided on the side of the second cutting portion 1112. Since the contour line of the cutting edge 12 is more complicated, it can meet the processing accuracy requirements More demanding situations to improve cutting capacity.

In order to avoid chipping of the workpiece during processing, between the front end surface of the first cutting portion 1111 and its side surface, between the first cutting portion 1111 and the second cutting portion 1112, and the second cutting portion The front end surface of 1112 and its side are connected by circular arcs, which can be seen by referring to FIG. 3 in detail. In the longitudinal cross-sectional view of the cutting body 11, the outline of the side of the cutting body 11 is a curved shape including multiple arcs and straight lines. The cutting edge 12 formed on the surface of the cutting body 11 is a spline curve connected by a plurality of arcs and straight lines. The shape of the cutting edge 12 is more complicated, which is suitable for processing brittle workpieces.

Preferably, in this embodiment, a cooling groove 14 is provided at a center of a front end surface of the cutting body 11, and a first end portion of the cutting edge 12 is provided at an outer edge of the cooling groove 14; the cooling groove 14 can Cooling the cutting edge 12 effectively reduces the thermal damage of the cutting edge 12, and the cooling groove 14 is provided at the center of the front end surface of the cutting body 11, which can make the cooling of the cooling groove 14 more uniform and the cooling effect is ideal.

Further, the spiral direction of the cutting edge 12 in this embodiment may be left-handed or right-handed.

Preferably, in this embodiment, the helix angle of the cutting edge 12 is 15 ° to 60 °. Increasing the helix angle appropriately can reduce the cutting force of the tool during processing, has strong impact resistance of the tool, and prevents vibration. It can also ensure better surface processing quality and increase the service life of the cutting tool. Based on the above-mentioned spiral angle, the strength of the cutting edge 12, the degree of sharpness, the size of the cutting force, and the discharge speed of waste chips are all ideal.

Further, as a preferred embodiment, the outer diameter of the cutting body 11 of the cutting edge portion 1 is 0.5 to 135 mm, and the number of the cutting edges 12 is determined by the width of the cutting edge 12. After the outer diameter of 11 is determined, the smaller the width of the cutting edge 12 is, the more the number of the cutting edges 12 is; the width of the cutting edge 12 is 0.01 ㎜ to 0.2 ㎜, and the length of the cutting edge 12 is 0.1 ㎜ to 15 ㎜, based on the above restrictions on the outer diameter of the cutting body 11 and the cutting edge width of the cutting edge 12, 3 to 150 or more cutting edges 12 may be provided on the cutting edge portion 1. Specifically, in this embodiment, the cutting edge width of the cutting edge 12 refers to the distance between the two sides of the cutting edge 12. As indicated in FIG. 2, a is the cutting edge width of the cutting edge 12. The edge length 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 surface of the cutting body 11. As indicated in FIGS. 4 and 5, L is the cutting edge 12. The blade is long. 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 forces and can adapt to higher cutting speeds and feeds, while reducing the edge width will improve processing Precision and cutting length determine the effective range of the cutting edge 12. Using the above-mentioned matching number of cutting edges 12, the width of the cutting edge and the length of the cutting edge, the cutting tool can have ideal processing accuracy while ensuring processing efficiency.

Further, the surface roughness of the cutting edge 12 ranges from 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, making the cutting process The surface accuracy of the object is guaranteed.

Specifically, the depth of the first chip evacuation slot 13 should match the cutting edge width and edge length of the corresponding cutting edge 12. Based on the above-mentioned cutting edge 12 and edge length, the groove depth of the first chip evacuation slot 13 is preferably It is 0.05㎜～ 0.3㎜, which makes the machining accuracy and machining effect better, and can also improve the machining efficiency and prolong the service life of the cutting tool.

In a specific embodiment, the length of the smoothing blade 17 is 0.01 ㎜ to 3 ㎜. Referring to FIG. 3 and FIG. 5, the length of the smoothing blade 17 refers to the diameter of the smoothing blade 17 along the cutting body 11. Projection length b in the direction.

In order to improve the chip evacuation efficiency and the machining efficiency of the cutting tool, the cutting body 11 is provided with a plurality of spiral second chip evacuation grooves 15 opposite to the cutting edge 12 direction. The second chip evacuation grooves 15 extends from the front end surface to the side surface of the cutting body 11, and each of the second chip discharge grooves 15 is provided along a circumferential direction of the central axis of the cutting body 11; The blade 12 is divided into several sections, which can be seen in detail with reference to FIG. 2.

Specifically, the related parameters of the second chip discharge slot 15 are matched with the above-mentioned parameters of the cutting edge 12. The specific parameters of the second chip discharge slot 15 in this embodiment are preferably: the helix angle of the second chip discharge slot 15 is 20 ° ～ 40 °, the interval between two adjacent second chip removing grooves 15 is 0.25㎜ to 0.75㎜, and the groove depth of the second chip removing grooves 15 is less than or equal to the cutting edge width, specifically It is 0.05 to 0.15.

In order to facilitate forming, the cutting edge portion 1 further includes a base body 16 which is fixedly connected to the rear end surface of the cutting body 11. The material of the base body 16 is a tungsten carbide-based hard alloy. Exemplarily, the specific forming process of the cutting edge portion 1 is as follows: first, the tungsten carbide-based hard alloy base 16 is used as a base, and natural or diamond powder and a binder are used at a high temperature (1000 ° C to 2000 ° C) and a high pressure (5 The cutting body 11 is sintered on the base 16 under a pressure of 100,000 atmospheres), and then the material is removed to form a cutting edge 12 on the outer surface of the cutting body 11.

The second aspect of this embodiment also proposes a cutting tool, as shown in FIG. 5 to FIG. 7, which includes a tool shank 2 and a cutting edge 1 as described above mounted on the front end of the tool shank 2. The tool shank portion 2 is connected to the rear end surface of the cutting body 11; since it includes the cutting edge portion 1 described above, it is an integral PCD cutting tool and has all the beneficial effects of the cutting edge portion 1, here No one by one statement.

Preferably, the material of the tool shank portion 2 is a tungsten carbide-based hard alloy, and the cutting edge portion 1 further includes a base body 16. The material of the base body 16 is a tungsten carbide based hard alloy, and the base body 16 is fixedly connected. On the rear end surface of the cutting body 11; the tool shank 2 and the rear end surface of the base body 16 are vacuum welded. In view of this, since the base 16 of the cutting edge 1 and the tool shank 2 are made of the same tungsten carbide-based hard alloy material, they have the same material characteristics. , Making the welding structure stability more ideal to ensure welding strength.

Exemplarily, the tool shank 2 and the base body 16 are welded by a silver brazing layer; wherein the silver brazing layer is solidified by the silver brazing material, and the silver brazing material is melted during the welding process to make the base body 16 and the tool The handle 2 is connected, and the latter two are fixed after being cured; specifically, the silver brazing material is made of silver as a base material and combined with other alloys. In this embodiment, due to the arrangement of the silver brazing layer, the tool shank 2 and the base body 16 can have a better welding and fixing effect.

Exemplarily, the tungsten carbide-based hard alloys used in the above-mentioned base 16 and tool shank 2 are sintered materials composed of tungsten carbide as a hard phase and a metal bonding phase; further, cobalt in the sintered material The mass percentage does not exceed 12%.

In a specific embodiment, the contour of the cutting tool is less than 0.01%; wherein, the contour refers to the change of the measured actual contour relative to the ideal contour, with or without a reference; the limitation of the contour of the cutting tool can be further This makes the cutting tool have better machining accuracy and machining effect.

According to a third aspect of the preferred embodiment of the present invention, an ultrasonic tool assembly is also provided, which includes the cutting tool described above. Since the cutting tool is included, it has all the beneficial effects of the cutting tool, and will not be described here one by one.

Example one

Specific embodiment 1 provides a cutting tool. The chip edge portion 1 includes 60 cutting edges 12.

Under the limitation of the number of the above-mentioned cutting edges 12, the above-mentioned cutting tools are used to process the glass, and the use parameters of the existing pad-type PCD cutting tools (including 3 cutting edges) and the diamond grinding head (600 #) and The comparison of service life is shown in the table below.

Under the limitation of the number of the above-mentioned cutting edges 12, the above-mentioned cutting tools are used to process ceramic workpieces, and the parameters of use with the existing pad-type PCD cutting tools (including 3 cutting edges) and diamond grinding heads (600 #) And the comparison of service life is shown in the table below.

Under the limitation of the number of the cutting edges 12, the above-mentioned cutting tools are used to finish the end face of sapphire. It is similar to the existing pad-type PCD cutting tools (including 3 cutting edges) and the diamond grinding head (600 #). The comparison of operating parameters and service life is shown in the table below.

As can be seen from the above three tables, the cutting tool in this embodiment is under the limited conditions based on the cutting edge 12 described above. When the cutting tool in this embodiment is used to process glass, ceramic and sapphire workpieces, compared with the existing Welded PCD cutting tools and commonly used diamond grinding heads have superior machining results, higher machining efficiency and longer service life.

Example two

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

Under the limited conditions based on the above parameters, the cutting tools in the embodiment of the present invention can achieve better results in machining accuracy and processing effect, higher processing efficiency, and a longer service life than traditional hard tools. Carbide cutting tools and existing pad-type PCD cutting tools are longer.

Example three

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

Under the limited conditions based on the above parameters, the cutting tools in the embodiments of the present invention have superior cutting tool processing effects, higher processing accuracy, higher processing efficiency, and a longer service life than traditional carbide cutting tools and existing The solder pad PCD cutting tool is longer.

Embodiment 4

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

Under the limited conditions based on the above parameters, the cutting tool in the embodiment of the present invention has a superior cutting tool processing effect, higher processing accuracy, higher processing efficiency, and a longer service life than traditional carbide cutting tools and existing cutting tools. Some pad-type PCD cutting tools are longer.

In summary, the embodiment of the present invention provides a cutting tool, a cutting edge portion 1 thereof, and an ultrasonic tool assembly including the cutting tool. The material of the cutting edge portion 1 of the cutting tool is polycrystalline diamond, and a plurality of cutting edges 12 are provided by integral molding. A cutting edge portion 1 is formed on the outer surface of the cutting body 11. Compared with the conventional pad-type PCD cutting tool, a larger number of cutting edges 12 can be provided on the cutting body 11 with the same outer diameter. The structure and design of the structure are more diversified. By providing 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 the service life; A plurality of helical cutting edges 12 are provided in the circumferential direction of the central axis, which can adapt to higher rotation speeds and knife consumption, thereby improving processing efficiency.

The above is only a preferred embodiment of the present invention. It should be noted that, for those of ordinary skill in the art, without departing from the technical principles of the present invention, several improvements and replacements can be made. These improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims

A cutting edge portion for a cutting tool is characterized in that the material of the cutting edge portion is polycrystalline diamond, the cutting edge portion includes a cutting body integrally formed and a plurality of cutting edges, and the cutting edges are spiral. Each of the cutting edges is disposed on the outer surface of the cutting body along the central axis of the cutting body, and a first chip discharge groove is provided between two adjacent cutting edges;

A first end portion of the cutting edge is provided on a front end surface of the cutting body, and the cutting edge extends along the front end surface of the cutting body and a side surface of the cutting body in order, so that the second end of the cutting edge An end portion is provided on a side surface of the cutting body.
The cutting edge portion according to claim 1, further comprising a smoothing edge integrally formed on the cutting body, the smoothing edge being disposed at a first end portion of the cutting edge and connected to the cutting edge. Smooth cutting edge transition.
The cutting edge portion according to claim 1, wherein the cutting body includes a cutting body end portion and a connecting portion fixedly connected through one end surface, and a first end portion of the cutting edge is provided at the cutting body end. And the cutting edge extends in this order along the front end surface of the cutting body end portion and the side surface of the cutting body end portion, so that the second end portion of the cutting edge is provided on the cutting body end portion. And the second end of the cutting edge is located at the connection between the end of the cutting body and the connecting portion.
The cutting edge portion according to claim 3, wherein the cutting main body end portion includes a first cutting portion and a second cutting portion that are coaxially and fixedly connected to form a step shape, and an outer portion of the first cutting portion The diameter is smaller than the outer diameter of the second cutting portion, and the second cutting portion is fixedly connected to the connecting portion.
The cutting edge portion according to claim 4, wherein the front end surface of the first cutting portion and its side surface, the first cutting portion and the second cutting portion, and the second cutting The front end surface of the part and its side are connected by arc transition.
The cutting edge portion according to claim 1, wherein a cooling groove is provided at a center of a front end surface of the cutting body, and a first end portion of the cutting edge is provided at an outer edge of the cooling groove.
The cutting edge portion according to claim 1, wherein a spiral direction of the cutting edge is left-handed or right-handed, and a spiral angle of the cutting edge is 15 ° to 60 °.
The cutting edge portion according to claim 1, wherein an outer diameter of the cutting body is 0.5㎜ to 135㎜, and the number of the cutting edges is determined by a width of the cutting edge, and the cutting edge The cutting edge has a width of 0.01 ㎜ to 0.2 ㎜, and the cutting edge has a cutting length of 0.1 ㎜ to 15 ㎜.
The cutting edge portion according to claim 8, wherein a groove depth of the first chip discharge groove is 0.05 ㎜ to 0.3 ㎜.
The cutting portion according to claim 2, wherein a length of the smoothing edge is 0.01 to 3 mm.
The cutting edge portion according to claim 1, wherein the cutting body is provided with a plurality of spiral second chip ejection grooves opposite to the direction of the cutting edge, and the second chip ejection grooves extend from the cutting chip. A front end surface of the cutting body extends to a side surface thereof, and each of the second chip evacuation grooves is circumferentially disposed along a central axis of the cutting body; the second chip evacuation grooves divide the cutting edges into a plurality of sections.
The cutting edge portion according to claim 11, wherein a helix angle of the second chip discharge groove is 20 ° to 40 °.
The cutting edge portion according to claim 11, wherein an interval between two adjacent second chip discharge grooves is 0.25 ㎜ to 0.75 ㎜; and a groove depth of the second chip discharge grooves is 0.05. ㎜～ 0.15㎜.
The cutting edge portion according to any one of claims 1 to 13, further comprising a base body, which is fixedly connected to a rear end surface of the cutting body, and the material of the base body is tungsten carbide-based hard material. alloy.
A cutting tool, comprising a tool shank and the cutting edge according to any one of claims 1 to 14 mounted on the front end of the tool shank, the tool shank and the cutting body The rear end of the connection.
The cutting tool according to claim 15, wherein the material of the tool shank portion is tungsten carbide-based hard alloy, the cutting edge portion further comprises a base body, and the base body is fixedly connected to the rear of the cutting body. On the end face, the material of the base body is tungsten carbide-based hard alloy; the tool shank and the rear end face of the base body are vacuum welded.
An ultrasonic tool assembly, comprising the cutting tool according to claim 15 or 16.