Diamond compact with good impact resistance

Abstract

The utility model discloses a diamond compact with good impact resistance, which is characterized in that a hard alloy matrix and a diamond layer are coaxially attached and connected into a whole, the attaching surface of the hard alloy matrix is a raised arc-shaped surface and is provided with a plurality of convex parts, and the convex parts are arranged on the surface of the hard alloy matrix. The multiple protruding parts are arranged on the binding face in a regular triangle shape, three concave parts are arranged on the edge of the binding face of the hard alloy base body, and the binding face of the diamond layer and the binding face of the hard alloy base body are of a complementary structure. The utility model has the beneficial effects that the hard alloy base body is arranged to be the raised arc-shaped surface so as to increase the area of the binding surface, the plurality of convex parts can increase the bonding strength, the shapes and the staggered arrangement mode of the convex parts can offset the impact force in multiple directions, and the concave-convex structure on the periphery further increases the bonding strength, so that the service life of the hard alloy base body is prolonged. And meanwhile, the impact force in the circumferential direction can be resisted, so that the impact resistance of the diamond compact is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the field of drilling equipment, in particular to a diamond composite sheet with good impact resistance. Background Art

[0002] Diamond composite sheet is a polycrystalline diamond product with a carbide body formed by sintering fine-grained diamond under high temperature and high pressure conditions. It is widely used as a drill bit cutting tooth in oil and gas field mining, mineral exploration and other fields. Diamond and carbide are two completely different materials. The physical and chemical properties of the two are very different. The thermal expansion coefficient of the former is very small, while the thermal expansion coefficient of the latter is very large. When synthesizing diamond composite sheets under high temperature and high pressure, there will be a large stress at the interface of the two materials because of the rapid heating and cooling process. This stress is harmful stress and has a great damage to the comprehensive performance of diamond composite sheets. Especially when used as a drill bit cutting tooth to break rocks, it will be subject to strong abrasive wear and impact, which often causes all or part of the diamond layer to fall off from the carbide matrix, thereby seriously affecting the performance and life of the cutting tooth. Therefore, how to improve the impact resistance of diamond composite sheets is an important issue that is widely concerned and needs to be solved in the industry. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a diamond composite sheet with good impact resistance, wherein the bonding surface structure of the diamond layer and the cemented carbide substrate is special and has good impact resistance.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A diamond composite sheet with good impact resistance, characterized by: a cemented carbide substrate and a diamond layer, the diamond layer and the cemented carbide substrate are coaxially bonded and connected as a whole, the bonding surface of the cemented carbide substrate is a raised arc surface, the bonding surface of the cemented carbide substrate has a plurality of protrusions, the plurality of protrusions are arranged in the form of an equilateral triangle on the bonding surface, and the center of the equilateral triangle is located on the axis of the cemented carbide substrate, the edge of the bonding surface of the cemented carbide substrate has three recessed portions, the recessed portions correspond to the midpoints of the three sides of the triangle, and the bonding surface of the diamond layer and the bonding surface of the cemented carbide substrate are complementary structures.

[0006] Furthermore, the middle of the top surface of the diamond layer is an equilateral triangle plane, and the equilateral triangle plane has a convex ridge along the direction opposite to each corner, and a concave arc surface is formed between any two adjacent ridges.

[0007] Furthermore, the equilateral triangle formed by the equilateral triangle plane and the protrusion is arranged in a 60° rotational offset manner.

[0008] Furthermore, the protrusion is in a shuttle shape, and each side arranged in an equilateral triangle has four protrusions arranged at intervals, and the length direction of each protrusion is the same as the midline direction of the side where it is located.

[0009] Furthermore, the recessed portion is an arc-shaped recessed portion superimposed in the radial direction and the axial direction of the cemented carbide substrate.

[0010] Furthermore, instead of arranging the plurality of protrusions in the form of regular triangles on the fitting surface, the plurality of protrusions are arranged in the form of regular quadrilaterals on the fitting surface, and two protrusions are arranged at each corner of the quadrilateral, and the center of the quadrilateral is located on the axis of the cemented carbide substrate.

[0011] Furthermore, the recessed portion is a superimposed structure of a tooth-shaped recess along the radial direction of the cemented carbide substrate and a step-shaped recess along the axial direction.

[0012] The beneficial effects of the utility model include: setting the cemented carbide substrate as a raised arc surface can increase the area of ​​the fitting surface, multiple protrusions can increase the bonding strength, the shape of the protrusions and the staggered arrangement can offset the impact forces in multiple directions, and the concave-convex structure on the periphery further increases the bonding strength, while being able to resist the impact force in the circumferential direction, thereby significantly increasing the impact resistance of the diamond composite sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of a cemented carbide substrate of Example 1;

[0014] Figure 2 is a schematic structural diagram of Example 1;

[0015] Figure 3 is a schematic structural diagram of a cemented carbide substrate of Example 2;

[0016] Figure 4 It is a structural schematic diagram of Example 2. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with specific embodiments and drawings.

[0018] Example 1

[0019] A kind of Figure 1-2The diamond composite sheet with good impact resistance shown in the figure has a cemented carbide substrate 1 and a diamond layer 2, and the diamond layer 2 and the cemented carbide substrate 1 are coaxially bonded and connected as a whole. The bonding surface of the cemented carbide substrate 1 is a raised arc surface, thereby increasing the area of ​​the bonding surface. There are multiple protrusions 3 on the bonding surface of the cemented carbide substrate 1, which are used to increase the bonding strength of the bonding surface. The multiple protrusions 3 are arranged in an equilateral triangle on the bonding surface, and the center of the equilateral triangle is located on the axis of the cemented carbide substrate 1, thereby ensuring that the impact resistance in each direction is the same. In order to increase the impact resistance in the circumferential direction, three recessed portions 4 are provided on the edge of the bonding surface of the cemented carbide substrate 1. The recessed portions 4 correspond to the midpoints of the three sides of the triangle, forming a complementary structure, which further increases the impact resistance in the radial, axial and circumferential directions. The bonding surface of the diamond layer 2 and the bonding surface of the cemented carbide substrate 1 are complementary structures.

[0020] The middle of the top surface of the diamond layer 2 is an equilateral triangular plane 5, and the equilateral triangular plane 5 has a raised ridge 6 along each angle, and between any two adjacent ridges 6 is a concave arc surface 7. The equilateral triangle formed by the equilateral triangular plane 5 and the raised portion 3 is rotated 60° and staggered, and this structure further increases the impact resistance of the diamond composite sheet.

[0021] The protrusion 3 is in the shape of a shuttle, and each side of the regular triangle arrangement has four protrusions 3 arranged at intervals, and the length direction of each protrusion 3 is the same as the midline direction of the side where it is located. Since the diamond composite sheet is rotary cut, it receives a greater impact in the rotation direction, so the protrusion 3 of this structure has a stronger ability to resist impact in the circumferential direction.

[0022] like Figure 1 The recessed portion 4 shown is an arc-shaped recessed portion superimposed in the radial direction and the axial direction of the cemented carbide substrate 1 in three directions.

[0023] Example 2

[0024] A diamond composite sheet with good impact resistance, a cemented carbide substrate 1 and a diamond layer 2, the diamond layer 2 and the cemented carbide substrate 1 are coaxially bonded and connected as a whole, the bonding surface of the cemented carbide substrate 1 is a raised arc surface, and the bonding surface of the cemented carbide substrate 1 has a plurality of protrusions 3, and the plurality of protrusions 3 are arranged on the bonding surface in the form of a regular quadrilateral, and two protrusions 3 are arranged at each corner of the quadrilateral, and the protrusions 3 are shuttle-shaped. This structure can withstand large impact forces in radial, axial and circumferential directions. The center of the quadrilateral is located on the axis of the cemented carbide substrate 1, and the impact resistance of all parties is balanced. The edge of the bonding surface of the cemented carbide substrate 1 has two recessed portions 4, and the recessed portions 4 are symmetrically arranged on the circumference of the cemented carbide substrate 1, and the bonding surface of the diamond layer 2 and the bonding surface of the cemented carbide substrate 1 are complementary structures. In this embodiment, the top surface of the diamond layer is a plane.

[0025] The recessed portion 4 is a superimposed structure of a tooth-shaped recess in the radial direction of the cemented carbide substrate 1 and a stepped recess in the axial direction. This structure can further improve the bonding strength between the cemented carbide substrate 1 and the diamond layer, and can further increase the impact resistance.

[0026] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A diamond composite sheet with good impact resistance, characterized in that: A cemented carbide substrate (1) and a diamond layer (2), wherein the diamond layer (2) and the cemented carbide substrate (1) are coaxially bonded and connected as a whole, the bonding surface of the cemented carbide substrate (1) is a raised arc-shaped surface, the bonding surface of the cemented carbide substrate (1) has a plurality of raised portions (3), the plurality of raised portions (3) are arranged on the bonding surface in the form of an equilateral triangle, and the center of the equilateral triangle is located on the axis of the cemented carbide substrate (1), the edge of the bonding surface of the cemented carbide substrate (1) has three recessed portions (4), the recessed portions (4) correspond to the midpoints of the three sides of the triangle, and the bonding surface of the diamond layer (2) and the bonding surface of the cemented carbide substrate (1) are complementary structures.

2. The diamond composite sheet with good impact resistance according to claim 1, characterized in that: The middle of the top surface of the diamond layer (2) is an equilateral triangle plane (5), and the equilateral triangle plane (5) has a convex ridge (6) along the direction directly opposite each corner, and a concave arc surface (7) is formed between any two adjacent ridges (6).

3. The diamond composite sheet with good impact resistance according to claim 2, characterized in that: The equilateral triangle formed by the equilateral triangle plane (5) and the protruding portion (3) is arranged in an offset manner with a rotation of 60 degrees.

4. The diamond composite sheet with good impact resistance according to claim 1, characterized in that: The protrusion (3) is in the shape of a shuttle, and each side arranged in an equilateral triangle has four protrusions (3) arranged at intervals, and the length direction of each protrusion (3) is the same as the midline direction of the side where it is located.

5. The diamond composite sheet with good impact resistance according to claim 1, characterized in that: The recessed portion (4) is an arc-shaped recessed portion superimposed in the radial direction and the axial direction of the cemented carbide substrate (1).

6. The diamond composite sheet with good impact resistance according to claim 1, characterized in that: Instead of arranging the plurality of protrusions (3) in the form of regular triangles on the fitting surface, the plurality of protrusions (3) are arranged in the form of regular quadrilaterals on the fitting surface, and two protrusions (3) are arranged at each corner of the quadrilateral, and the center of the quadrilateral is located on the axis of the cemented carbide substrate (1).

7. The diamond composite sheet with good impact resistance according to claim 6, characterized in that: The recessed portion (4) is a superimposed structure of a tooth-shaped recess along the radial direction of the cemented carbide substrate (1) and a step-shaped recess along the axial direction.

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