Impact-resistant diamond compact

Abstract

The utility model discloses an impact-resistant diamond compact which is characterized in that the impact-resistant diamond compact comprises a diamond layer and a hard alloy matrix, the diamond layer and the hard alloy matrix are coaxially arranged in an attached mode, the attached face of the hard alloy matrix is a protruding arc-shaped face, a plurality of protruding parts are arranged on the attached face of the hard alloy matrix, and the protruding parts are matched with the diamond layer. The top surface of each lug boss comprises an outer ridge, a middle groove, an inner ridge, a diamond layer and a hard alloy matrix which are sequentially arranged, and the peripheral edge of the binding surface is provided with a concave-convex 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 petroleum drilling, in particular to an impact-resistant diamond composite sheet. 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 an impact-resistant diamond composite sheet, which has a special structure of the bonding surface between the diamond layer and the cemented carbide substrate and has good impact resistance.

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

[0005] An impact-resistant diamond composite sheet, characterized in that it includes a diamond layer and a cemented carbide substrate, the diamond layer and the cemented carbide substrate are coaxially bonded, the bonding surface of the cemented carbide substrate is a raised arc-shaped surface, the bonding surface of the cemented carbide substrate has a plurality of protrusions, the plurality of protrusions are arranged in a concentric ring shape on the bonding surface, the top surface of the protrusions includes an outer ridge, a middle groove, and an inner ridge arranged in sequence, and the outer peripheral edge of the bonding surface of the diamond layer and the cemented carbide substrate has a concave-convex structure.

[0006] Furthermore, the protrusions form three concentric circular rings centered on the axis of the cemented carbide substrate, and the protrusions of the three concentric circular rings are staggered along the radial direction of the cemented carbide substrate.

[0007] Furthermore, the protrusion height of the protrusion decreases from the outer circle to the inner circle.

[0008] Furthermore, the outer ridge and the inner ridge on the innermost circular ring are connected at the beginning and the end as a whole.

[0009] Furthermore, the concave-convex structure is one, two arranged axially symmetrically, or three arranged centrosymmetrically.

[0010] Furthermore, the concave-convex structure includes a concave portion on the cemented carbide substrate and a convex portion on the diamond layer, and the concave portion and the convex portion correspond to each other.

[0011] Furthermore, the recessed portion is recessed in a stepped shape along the axial direction of the cemented carbide substrate, and is recessed in a toothed shape along the circumferential direction of the cemented carbide substrate.

[0012] Furthermore, the recessed portion is recessed in an arc shape along the axial direction of the cemented carbide substrate, and the recessed portion is recessed in an arc shape along the radial direction of the cemented carbide substrate.

[0013] Furthermore, the top surface of the diamond layer is a plane or a roof top surface or a triangular flat top + three ridge top surface.

[0014] 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

[0015] Figure 1 is a schematic structural diagram of a cemented carbide substrate of Example 1;

[0016] Figure 2 is a schematic structural diagram of Example 1;

[0017] Figure 3 is a schematic structural diagram of Example 2;

[0018] Figure 4 is a schematic structural diagram of Example 3;

[0019] Figure 5 It is a structural schematic diagram of Example 4. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0021] Example 1

[0022] A kind of Figure 1-2The impact-resistant diamond composite sheet shown includes a diamond layer 1 and a cemented carbide substrate 2. The diamond layer 1 and the cemented carbide substrate 2 are coaxially bonded. The bonding surface of the cemented carbide substrate 2 is a raised arc surface. The bonding surface of the cemented carbide substrate 2 has multiple protrusions 3. The multiple protrusions 3 are arranged in three concentric rings on the bonding surface. The protrusions 3 of the three concentric rings are staggered along the radial direction of the cemented carbide substrate. This avoids the protrusions 3 being arranged along a radial straight line, and the impact resistance is better. The characteristics of this design: 1. After finite element mechanics analysis, the stress of the bonding surface is improved, and 2. When the external impact force acts, the force can be effectively dispersed.

[0023] Furthermore, as the thickness behind the edge of the diamond layer 1 is greater than the thickness at the center, the protrusion height of the protrusion 3 in this embodiment decreases from the outer ring to the inner ring. The top surface of the protrusion 3 includes an outer ridge 31, a middle groove 32, and an inner ridge 33 arranged in sequence, further increasing the bonding area between the protrusion 3 and the diamond layer and increasing the bonding strength. Thus, the impact resistance is also increased. The outer ridge 31 and the inner ridge 33 on the innermost ring are connected at the head and tail. The middle groove 32 is changed from a through groove to a closed groove, and the corresponding diamond layer has a toothed structure inserted into the middle groove 32, which can resist impact forces in multiple directions.

[0024] The outer peripheral edge of the bonding surface of the diamond layer 1 and the cemented carbide substrate 2 has three concave-convex structures 4. The three concave-convex structures are evenly distributed on the circumferential surface. The concave-convex structure 4 includes a concave portion 41 on the cemented carbide substrate 2 and a convex portion 42 on the diamond layer 1, and the concave portion 41 corresponds to the convex portion 42. The concave portion 41 is stepped along the axial direction of the cemented carbide substrate 2, and the concave portion 41 is toothed along the circumferential direction of the cemented carbide substrate 2.

[0025] The top surface of the diamond layer 1 is a triangular flat top + three-ridge top surface, wherein the three raised ridges extend along the corner tips of the triangle.

[0026] Example 2

[0027] A kind of Figure 3 The impact-resistant diamond composite sheet shown includes a diamond layer 1 and a cemented carbide substrate 2. The diamond layer 1 and the cemented carbide substrate 2 are coaxially bonded. The bonding surface of the cemented carbide substrate 2 is a raised arc surface. The bonding surface of the cemented carbide substrate 2 has multiple protrusions 3. The multiple protrusions 3 are arranged in three concentric rings on the bonding surface. The protrusions 3 of the three concentric rings are staggered along the radial direction of the cemented carbide substrate. This avoids the protrusions 3 being arranged along a radial straight line, and the impact resistance is better. The characteristics of this design: 1. After finite element mechanics analysis, the stress of the bonding surface is improved, and 2. When the external impact force acts, the force can be effectively dispersed.

[0028] Furthermore, as the thickness behind the edge of the diamond layer 1 is greater than the thickness at the center, the protrusion height of the protrusion 3 in this embodiment decreases from the outer ring to the inner ring. The top surface of the protrusion 3 includes an outer ridge 31, a middle groove 32, and an inner ridge 33 arranged in sequence, further increasing the bonding area between the protrusion 3 and the diamond layer and increasing the bonding strength. Thus, the impact resistance is also increased. The outer ridge 31 and the inner ridge 33 on the innermost ring are connected at the head and tail. The middle groove 32 is changed from a through groove to a closed groove, and the corresponding diamond layer has a toothed structure inserted into the middle groove 32, which can resist impact forces in multiple directions.

[0029] The outer peripheral edge of the bonding surface of the diamond layer 1 and the cemented carbide substrate 2 has two concave-convex structures 4. The two concave-convex structures are symmetrically arranged on the circumferential surface. The concave-convex structure 4 includes a concave portion 41 on the cemented carbide substrate 2 and a convex portion 42 on the diamond layer 1, and the concave portion 41 corresponds to the convex portion 42. The concave portion 41 is stepped along the axial direction of the cemented carbide substrate 2, and the concave portion 41 is toothed along the circumferential direction of the cemented carbide substrate 2.

[0030] The top surface of the diamond layer 1 is a plane.

[0031] Example 3

[0032] A kind of Figure 3 The impact-resistant diamond composite sheet shown includes a diamond layer 1 and a cemented carbide substrate 2. The diamond layer 1 and the cemented carbide substrate 2 are coaxially bonded. The bonding surface of the cemented carbide substrate 2 is a raised arc surface. The bonding surface of the cemented carbide substrate 2 has multiple protrusions 3. The multiple protrusions 3 are arranged in three concentric rings on the bonding surface. The protrusions 3 of the three concentric rings are staggered along the radial direction of the cemented carbide substrate. This avoids the protrusions 3 being arranged along a radial straight line, and the impact resistance is better. The characteristics of this design: 1. After finite element mechanics analysis, the stress of the bonding surface is improved, and 2. When the external impact force acts, the force can be effectively dispersed.

[0033] Furthermore, as the thickness behind the edge of the diamond layer 1 is greater than the thickness at the center, the protrusion height of the protrusion 3 in this embodiment decreases from the outer ring to the inner ring. The top surface of the protrusion 3 includes an outer ridge 31, a middle groove 32, and an inner ridge 33 arranged in sequence, further increasing the bonding area between the protrusion 3 and the diamond layer and increasing the bonding strength. Thus, the impact resistance is also increased. The outer ridge 31 and the inner ridge 33 on the innermost ring are connected at the head and tail. The middle groove 32 is changed from a through groove to a closed groove, and the corresponding diamond layer has a toothed structure inserted into the middle groove 32, which can resist impact forces in multiple directions.

[0034] The outer peripheral edge of the bonding surface of the diamond layer 1 and the cemented carbide substrate 2 has two concave-convex structures 4. The two concave-convex structures are symmetrically arranged on the circumferential surface. The concave-convex structure 4 includes a concave portion 41 on the cemented carbide substrate 2 and a convex portion 42 on the diamond layer 1, and the concave portion 41 corresponds to the convex portion 42. The concave portion 41 is stepped along the axial direction of the cemented carbide substrate 2, and the concave portion 41 is toothed along the circumferential direction of the cemented carbide substrate 2.

[0035] The top surface of the diamond layer 1 is a ridge surface, that is, there is a raised ridge in the middle.

[0036] Example 4

[0037] A kind of Figure 1-2 The impact-resistant diamond composite sheet shown includes a diamond layer 1 and a cemented carbide substrate 2. The diamond layer 1 and the cemented carbide substrate 2 are coaxially bonded. The bonding surface of the cemented carbide substrate 2 is a raised arc surface. The bonding surface of the cemented carbide substrate 2 has multiple protrusions 3. The multiple protrusions 3 are arranged in three concentric rings on the bonding surface. The protrusions 3 of the three concentric rings are staggered along the radial direction of the cemented carbide substrate. This avoids the protrusions 3 being arranged along a radial straight line, and the impact resistance is better. The characteristics of this design: 1. After finite element mechanics analysis, the stress of the bonding surface is improved, and 2. When an external impact force acts, the force can be effectively dispersed.

[0038] Furthermore, as the thickness behind the edge of the diamond layer 1 is greater than the thickness at the center, the protrusion height of the protrusion 3 in this embodiment decreases from the outer ring to the inner ring. The top surface of the protrusion 3 includes an outer ridge 31, a middle groove 32, and an inner ridge 33 arranged in sequence, which further increases the bonding area between the protrusion 3 and the diamond layer and increases the bonding strength. Thus, the impact resistance is also increased. The outer ridge 31 and the inner ridge 33 on the innermost ring are connected at the head and tail. The middle groove 32 is changed from a through groove to a closed groove, and the corresponding diamond layer has a toothed structure inserted into the middle groove 32, which can resist impact forces in multiple directions.

[0039] The outer peripheral edge of the bonding surface of the diamond layer 1 and the cemented carbide substrate 2 has three concave-convex structures 4. The three concave-convex structures are evenly distributed on the circumferential surface. The concave-convex structure 4 includes a concave portion 41 on the cemented carbide substrate 2 and a convex portion 42 on the diamond layer 1, and the concave portion 41 corresponds to the convex portion 42. The concave portion 41 is concave in an arc shape along the axial direction of the cemented carbide substrate 2, and the concave portion 41 is concave in an arc shape along the radial direction of the cemented carbide substrate 2.

[0040] The top surface of the diamond layer 1 is a triangular flat top + three-ridge top surface, wherein the three raised ridges extend along the corner tips of the triangle.

[0041] 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. An impact-resistant diamond composite sheet, characterized in that: The invention comprises a diamond layer (1) and a cemented carbide substrate (2), wherein the diamond layer (1) and the cemented carbide substrate (2) are coaxially bonded, the bonding surface of the cemented carbide substrate (2) is a raised arc-shaped surface, the bonding surface of the cemented carbide substrate (2) is provided with a plurality of raised portions (3), the plurality of raised portions (3) are arranged in a concentric circular shape on the bonding surface, the top surface of the raised portion (3) comprises an outer ridge (31), a middle groove (32), and an inner ridge (33) arranged in sequence, and the outer peripheral edge of the bonding surface of the diamond layer (1) and the cemented carbide substrate (2) has a concave-convex structure (4).

2. The impact-resistant diamond composite sheet according to claim 1, characterized in that: The raised portions (3) form three concentric circular rings with the axis of the cemented carbide substrate (2) as the center, and the raised portions (3) of the three concentric circular rings are staggered in the radial direction of the cemented carbide substrate.

3. The impact-resistant diamond composite sheet according to claim 2, characterized in that: The protrusion height of the protrusion (3) decreases from the outer circle to the inner circle.

4. The impact-resistant diamond composite sheet according to claim 3, characterized in that: The outer ridge (31) and the inner ridge (33) on the innermost circular ring are connected at both ends.

5. The impact-resistant diamond composite sheet according to claim 1, characterized in that: The concave-convex structure (4) is one or two arranged axially symmetrically or three arranged centrosymmetrically.

6. The impact-resistant diamond composite sheet according to claim 5, characterized in that: The concave-convex structure (4) comprises a concave portion (41) on the cemented carbide substrate (2) and a convex portion (42) on the diamond layer (1), and the concave portion (41) and the convex portion (42) correspond to each other.

7. The impact-resistant diamond composite sheet according to claim 6, characterized in that: The recessed portion (41) is recessed in a stepped shape along the axial direction of the cemented carbide substrate (2), and the recessed portion (41) is recessed in a toothed shape along the circumferential direction of the cemented carbide substrate (2).

8. The impact-resistant diamond composite sheet according to claim 6, characterized in that: The recessed portion (41) is recessed in an arc shape along the axial direction of the cemented carbide substrate (2), and the recessed portion (41) is recessed in an arc shape along the radial direction of the cemented carbide substrate (2).

9. The impact-resistant diamond composite sheet according to claim 1, characterized in that: The top surface of the diamond layer (1) is a flat surface or a ridge top surface or a triangular flat top + three ridge top surface.

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