Polycrystalline diamond compact

Abstract

The utility model relates to the technical field of diamond compacts, in particular to a polycrystalline diamond compact, which comprises a diamond substrate and a polycrystalline cutting layer, the diamond substrate is positioned under the polycrystalline cutting layer, and a round cutting surface is arranged on the surface of the polycrystalline cutting layer and comprises a plurality of cutting sharp teeth. A plurality of cutting sharp teeth are evenly distributed on a round cutting face, the whole cutting sharp teeth are of a conical structure and are integrally formed, each cutting sharp tooth comprises a plurality of plane parts, the tops of the plane parts abut against one another to form a cutting included angle, the cutting sharp teeth can be of a triangular pyramid structure as a whole, and therefore the cutting sharp teeth can be used for cutting a workpiece. Triangular stress is achieved through the triangular pyramid structure, the stress stability is ensured, the abrasion resistance and impact resistance of the diamond compact can be effectively improved, and then the service life is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of diamond composite sheets, in particular to a polycrystalline diamond composite sheet. Background Art

[0002] Polycrystalline diamond composite sheet is a new functional material. It is made of diamond powder and cemented carbide substrate sintered under ultra-high pressure and high temperature conditions. It has the high hardness, high wear resistance and thermal conductivity of diamond, and the strength and impact toughness of cemented carbide. It is an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools.

[0003] In the production process, the composite material of polycrystalline diamond thin layer attached and bonded to the cemented carbide substrate is called diamond composite sheet. Diamond composite sheet has both the extremely high wear resistance of diamond polycrystalline and the high impact resistance of cemented carbide, and the diamond layer can always maintain a sharp cutting edge, so it is used in soft to medium hard formations in petroleum and geological drilling. The existing polycrystalline diamond thin layer is mainly distributed on the top surface of diamond cemented carbide. In order to improve the cutting effect, the existing polycrystalline diamond thin layer mainly adopts the method of increasing the cutting edge length, but it will cause the stability of the polycrystalline diamond thin layer to be poor when used for a long time, and it will also lead to insufficient impact resistance.

[0004] Referring to the patent publication number "CN220645839U", the patent name "A polycrystalline diamond composite sheet and a PDC drill bit", the technical solution discloses "A polycrystalline diamond composite sheet and a PDC drill bit. The polycrystalline diamond composite sheet includes a cemented carbide substrate and a diamond layer, the side of the diamond layer away from the cemented carbide substrate is a cutting surface, the cutting surface is provided with a cutting edge for cutting and breaking rocks, the cutting surface is provided with a chip groove extending from the cutting edge through the diamond layer, and the upper edge of the chip groove is flush with the cutting surface. The PDC drill bit includes the above-mentioned polycrystalline diamond composite sheet." Although this technical solution can increase the length of the cutting edge to improve the effect of cutting rocks, and also provides a chip groove on the cutting surface to discharge debris through the chip groove, this technical solution cannot effectively improve the structural stability of the cutting surface, and cannot guarantee high wear resistance and impact resistance, which will affect the service life of the diamond composite sheet.

[0005] Therefore, how to improve the stress structure stability of the cutting surface of the diamond composite sheet is the main technical problem that technicians need to solve. Utility Model Content

[0006] The purpose of the utility model is to provide a polycrystalline diamond composite sheet to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A polycrystalline diamond composite sheet, comprising:

[0009] A diamond substrate; and a polycrystalline cutting layer;

[0010] The diamond matrix is ​​located directly below the polycrystalline cutting layer, and a circular cutting surface is provided on the surface of the polycrystalline cutting layer, the circular cutting surface includes a plurality of cutting teeth, the plurality of cutting teeth are evenly distributed on the circular cutting surface, and the plurality of cutting teeth are integrally formed in a conical structure as a whole;

[0011] Each of the cutting teeth includes a plurality of plane portions, and the tops of the plurality of plane portions abut against each other to form a cutting angle.

[0012] Preferably, when the cutting tooth is a triangular cone structure as a whole, the cutting tooth includes three planar portions, and the three planar portions are evenly distributed on the outside of the cutting tooth.

[0013] Preferably, when the cutting tooth is in a quadrangular pyramidal structure as a whole, the cutting tooth includes four planar portions, and the four planar portions are symmetrically arranged on the outside of the cutting tooth.

[0014] Preferably, the cutting angles of the plurality of planar portions are acute angles, and chip removal chamfers are provided between two adjacent planar portions.

[0015] Preferably, the plurality of planar portions are all triangular in shape, and the plurality of planar portions are all obliquely arranged outside the cutting tooth.

[0016] Preferably, the bottoms of two adjacent cutting teeth abut against each other.

[0017] Preferably, the central axis of the circular cutting surface and the central axis of the diamond matrix are located on the same central axis.

[0018] Preferably, the diamond matrix is ​​in an overall cylindrical structure, and a chamfer is provided on the top of the diamond matrix.

[0019] Compared with the prior art, the technical scheme provides a polycrystalline diamond composite sheet: a diamond matrix and a polycrystalline cutting layer are provided, the diamond matrix is ​​located directly below the polycrystalline cutting layer, a circular cutting surface is provided on the surface of the polycrystalline cutting layer, the circular cutting surface includes a plurality of cutting teeth, the plurality of cutting teeth are evenly distributed on the circular cutting surface, and the plurality of cutting teeth are integrally formed in a conical structure as a whole, each cutting tooth includes a plurality of planar portions, the tops of the plurality of planar portions are abutted against each other to form a cutting angle, wherein the cutting teeth as a whole can be in a triangular cone structure, the triangular cone structure is used to bear a force in a triangular manner, the force stability is ensured, the wear resistance and impact resistance of the diamond composite sheet can be effectively improved, and the service life can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0022] Figure 2 It is a schematic diagram of the overall structure of the utility model from another viewing angle.

[0023] Figure 3 It is an enlarged schematic diagram of point A in the utility model.

[0024] As shown in the figure: 1. diamond substrate; 2. polycrystalline cutting layer; 3. cutting teeth; 21. circular cutting surface; 31. flat part; 32. chip removal chamfer. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. All other embodiments obtained by ordinary personnel in this field without making creative work belong to the protection scope of the utility model. The preferred implementation of the utility model will be described in more detail below with reference to the drawings. Although the preferred implementation of the utility model is shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the implementation described here. On the contrary, these implementations are provided to make the utility model more thorough and complete, and to fully convey the scope of the utility model to those skilled in the art.

[0026] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] In the description of the present invention, it should be understood that the terms "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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 on the present invention.

[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various components in the present invention, this information should not be limited to these terms. These terms are only used to distinguish components of the same type from each other. For example, without departing from the scope of the present invention, the first component may also be referred to as the second component, and similarly, the second component may also be referred to as the first component. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] The technical solution of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0032] refer to Figures 1 to 3 , a polycrystalline diamond composite sheet, comprising:

[0033] A diamond substrate 1; and a polycrystalline cutting layer 2; the diamond substrate 1 is located directly below the polycrystalline cutting layer 2, and a circular cutting surface 21 is provided on the surface of the polycrystalline cutting layer 2, the circular cutting surface 21 includes a plurality of cutting teeth 3, the plurality of cutting teeth 3 are evenly distributed on the circular cutting surface 21, and the plurality of cutting teeth 3 are integrally formed and arranged in a conical structure as a whole;

[0034] Each of the cutting teeth 3 includes a plurality of planar portions 31 , and the tops of the plurality of planar portions 31 abut against each other to form a cutting angle.

[0035] Specifically, when the cutting tooth 3 is a triangular pyramid structure as a whole, the cutting tooth 3 includes three plane parts 31, and the three plane parts 31 are evenly distributed outside the cutting tooth 3. Specifically, when the cutting tooth 3 is a quadrangular pyramid structure as a whole, the cutting tooth 3 includes four plane parts 31, and the four plane parts 31 are symmetrically arranged outside the cutting tooth 3.

[0036] Specifically, the cutting angles of the plurality of plane portions 31 are acute angles, and chip removal chamfers 32 are provided between any two adjacent plane portions 31 .

[0037] Specifically, the plurality of plane portions 31 are all triangular in shape, and the plurality of plane portions 31 are all obliquely arranged outside the cutting teeth 3 .

[0038] Specifically, the bottoms of two adjacent cutting teeth 3 abut against each other.

[0039] Specifically, the central axis of the circular cutting surface 21 and the central axis of the diamond substrate 1 are located on the same central axis.

[0040] Specifically, the diamond substrate 1 is in a cylindrical structure as a whole, and a rounded corner is arranged on the top of the diamond substrate 1 .

[0041] Embodiment 1

[0042] In order to improve the force stability of the cutting surface of the diamond composite sheet and ensure that the cutting surface has higher wear resistance during use, in this embodiment: a diamond matrix 1 and a polycrystalline cutting layer 2 are provided; the diamond matrix 1 is located directly below the polycrystalline cutting layer 2, and a circular cutting surface 21 is provided on the surface of the polycrystalline cutting layer 2, the circular cutting surface 21 includes a plurality of cutting teeth 3, so that the plurality of cutting teeth 3 are evenly distributed on the circular cutting surface 21, and the plurality of cutting teeth 3 are integrally formed in a conical structure as a whole, each cutting tooth 3 includes a plurality of flat portions 31, and the tops of the plurality of flat portions 31 abut against each other to form a cutting angle, through the cutting teeth 3, the force stability of the cutting surface of the diamond composite sheet can be ensured, and the wear resistance of the diamond composite sheet can be effectively improved, and the service life of the diamond composite sheet can be extended.

[0043] It should be noted that when the cutting tooth 3 is a quadrangular pyramid structure as a whole, the cutting tooth 3 includes four planar portions 31. The four planar portions 31 are symmetrically arranged on the outside of the cutting tooth 3 to ensure symmetry, improve uniform force, and ensure durability.

[0044] It should be noted that the cutting angles of the plurality of planar portions 31 are made acute angles, and chip chamfers 32 are provided between the planar portions 31 adjacent to each other, so that when the cutting angle contacts the rock to be cut, the debris can slide off through the chip chamfers 32 between the adjacent planar portions 31 .

[0045] It should also be noted that by making several planar portions 31 triangular in shape and obliquely setting several planar portions 31 on the outside of the cutting tooth 3, it is possible to ensure that when the top of the cutting tooth 3 is subjected to force, the force is transmitted to the bottom of the cutting tooth 3, and the force is dispersed from the top of the cutting tooth 3 to the bottom of the cutting tooth 3, thereby preventing the force points from being too concentrated, resulting in a decrease in durability.

[0046] In particular, to ensure the verticality of the installation, the central axis of the circular cutting surface 21 and the central axis of the diamond substrate 1 are located on the same central axis, thereby ensuring that the circular cutting surface 21 is located at the top center of the diamond substrate 1.

[0047] In this embodiment, it is further supplemented that, in order to facilitate the installation of the diamond composite sheet in the hole of the drill bit, the diamond substrate 1 can be made into a cylindrical structure as a whole. In order to prevent the top part of the diamond substrate 1 from contacting the rock to be cut when the drill bit is tilted and cut, the top of the diamond substrate 1 can also be provided with a rounded corner.

[0048] Embodiment 2

[0049] In order to prevent the cutting teeth 3 from being in a four-sided pyramid structure, the bottom of the four-sided pyramid is a square, and the force has a certain symmetry, which leads to insufficient impact resistance, and to ensure that the force is stable while improving the impact resistance, so as to increase the service life of the diamond composite sheet, in this embodiment: a diamond matrix 1 and a polycrystalline cutting layer 2 are provided; the diamond matrix 1 is located directly below the polycrystalline cutting layer 2, and a circular cutting surface 21 is provided on the surface of the polycrystalline cutting layer 2, and the circular cutting surface 21 includes a plurality of cutting teeth 3, so that the plurality of cutting teeth 3 are evenly distributed on the circular cutting surface 21, and the cutting teeth 3 are integrally formed into a three-sided structure. The conical structure can achieve a stable triangular force effect by virtue of the triangular bottom surface of the triangular cone. The cutting tooth 3 includes three plane portions 31, and the three plane portions 31 are evenly distributed on the outside of the cutting tooth 3, so as to effectively contact the position to be cut through the circular cutting surface 21 of the polycrystalline cutting layer 2. In this process, the ends of several cutting teeth 3 on the circular cutting surface 21 are all in contact with the rock to be cut, and the top of the cutting tooth 3 is subjected to force and transmitted to the top of the cutting tooth 3. Since the bottom surface of the triangular cone is a triangle, it can be kept stable by triangular force, thereby improving impact resistance, so as to increase the service life of the diamond composite sheet.

[0050] It should be noted that the plurality of plane portions 31 are all triangular in shape, and the plurality of plane portions 31 are all tiltedly arranged outside the cutting teeth 3, so as to ensure that the force is stable and that the chips can slide down through the plane portions 31, so as to prevent the top of the cutting teeth 3 from being blocked by chips and affecting the cutting condition. It should be noted that the cutting angles of the plurality of plane portions 31 are acute, and chip removal chamfers 32 are arranged between two adjacent plane portions 31, so as to ensure that the chips can slide down through the chip removal chamfers 32 during the cutting process.

[0051] It should also be noted that when the bottoms of two adjacent cutting teeth 3 are abutted against each other, when the cutting angle at the top of the cutting teeth 3 is subjected to force, the force is transmitted to the bottom of the cutting teeth 3, which can ensure that the force is stable.

[0052] The scheme of the utility model has been described in detail above with reference to the accompanying drawings. In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for the utility model.

[0053] In addition, it can be understood that the steps in the method of the embodiment of the utility model can be adjusted in order, combined and deleted according to actual needs, and the structure in the device of the embodiment of the utility model can be combined, divided and deleted according to actual needs.

[0054] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A polycrystalline diamond composite sheet, characterized in that: include: Diamond substrate; and polycrystalline cutting layer; The diamond matrix is ​​located directly below the polycrystalline cutting layer, and a circular cutting surface is provided on the surface of the polycrystalline cutting layer, wherein the circular cutting surface includes a plurality of cutting teeth, the plurality of cutting teeth are evenly distributed on the circular cutting surface, and the plurality of cutting teeth are integrally formed in a conical structure as a whole; Each of the cutting teeth includes a plurality of plane portions, and the tops of the plurality of plane portions abut against each other to form a cutting angle.

2. The polycrystalline diamond composite sheet according to claim 1, characterized in that: When the cutting tooth is a triangular cone structure as a whole, the cutting tooth includes three plane parts, and the three plane parts are evenly distributed on the outside of the cutting tooth.

3. The polycrystalline diamond composite sheet according to claim 1, characterized in that: When the cutting tooth is in a quadrangular pyramidal structure as a whole, the cutting tooth includes four planar portions, and the four planar portions are symmetrically arranged outside the cutting tooth.

4. The polycrystalline diamond composite sheet according to claim 1, characterized in that: The cutting angles of the plurality of plane portions are acute angles, and chip removal chamfers are arranged between two adjacent plane portions.

5. The polycrystalline diamond compact according to claim 1, characterized in that: The plurality of plane portions are all triangular in shape, and the plurality of plane portions are all obliquely arranged outside the cutting teeth.

6. The polycrystalline diamond compact according to claim 1, characterized in that: The bottoms of two adjacent cutting teeth are in contact with each other.

7. The polycrystalline diamond compact according to claim 1, characterized in that: The central axis of the circular cutting surface and the central axis of the diamond matrix are both located on the same central axis.

8. The polycrystalline diamond compact according to claim 1, characterized in that: The diamond matrix is ​​in a cylindrical structure as a whole, and a rounded corner is arranged on the top of the diamond matrix.

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