Hard alloy matrix and diamond compact

Abstract

The utility model discloses a hard alloy substrate and a diamond compact, and the hard alloy substrate comprises a base, a hard alloy substrate and a hard alloy substrate, the spherical circular truncated cone is arranged on the top side of the base, a circular plane is arranged at the top of the spherical circular truncated cone, and the spherical circular truncated cone, the circular plane and the base share the same central axis; a plurality of bosses are arranged, the top surface of each boss is a cambered surface, the edge part of each boss is a fillet, each boss is arranged on the side circumferential surface of the spherical circular truncated cone and forms a circle in a surrounding manner to form a boss ring, and the distance between every two adjacent bosses is consistent in the circumferential direction of the spherical circular truncated cone. In the utility model, through the cambered surface at the top of the boss and the round corner at the edge part, the stress structure can be prevented from being damaged by a sharp corner when the hard alloy substrate is combined with the diamond layer, so that the stress of each area is more uniform, and the stress concentration phenomenon at the hard combining surface is greatly reduced; the impact resistance of the diamond compact is effectively improved, and the service life of the diamond compact is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of superhard material manufacturing, in particular to a hard alloy matrix and a diamond composite sheet. Background Art

[0002] Diamond composite sheet is a superhard material synthesized from artificial diamond powder and cemented carbide under high temperature and high pressure. It not only has the high wear resistance and high hardness of diamond, but also has the excellent impact resistance and weldability of cemented carbide. Therefore, it is widely used in oil drilling, natural gas extraction and geological drilling.

[0003] Due to the difference in thermal expansion coefficients between diamond and cemented carbide substrates, diamond composite sheets that have been sintered at high temperature and high pressure and then cooled usually have concentrated residual stress at the interface between the two. This residual stress can cause cracks or even delamination at the junction of the diamond layer and the cemented carbide layer. During drilling, this residual stress can even cause the diamond layer to break and peel off from the substrate, causing the diamond composite sheet to fail, seriously affecting its wear resistance, impact resistance and service life.

[0004] Therefore existing technology still needs to be improved and improved. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a cemented carbide substrate and a diamond composite sheet, aiming to solve the problem in the prior art that the diamond composite sheet after high-temperature and high-pressure sintering and cooling usually has concentrated residual stress at the interface between the diamond layer and the cemented carbide layer. This residual stress can cause cracks or even delamination at the junction of the diamond layer and the cemented carbide layer, which seriously affects the wear resistance, impact resistance and service life of the diamond composite sheet.

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0007] In a first aspect, an embodiment of the present invention provides a cemented carbide substrate, comprising:

[0008] base;

[0009] A spherical cone, the spherical cone is arranged on the top side of the base, the top of the spherical cone is provided with a circular plane, and the spherical cone, the circular plane and the base share a central axis;

[0010] There are multiple bosses, the top surface of each boss is an arc surface, and the edge of each boss is a rounded corner. Each boss is respectively arranged on the side surface of the spherical cone and is circled to form a boss circle. Along the circumference of the spherical cone, the distance between each two adjacent bosses is consistent.

[0011] As a further improved technical solution, the base is cylindrical, and the size of the top surface of the base is consistent with the size of the bottom surface of the spherical cone.

[0012] As a further improved technical solution, the side circumference of the spherical cone is a sphere, and with the central axis of the spherical cone as the center, a plurality of boss rings are provided on the side circumference of the spherical cone. Along the bottom side of the base to the circular plane, the radius of each boss ring gradually decreases, and the spacing between each boss ring is consistent.

[0013] As a further improved technical solution, the number of bosses in each boss ring is consistent, and the distance between each two adjacent bosses in any boss ring is consistent.

[0014] As a further improved technical solution, the boss includes an ellipsoidal shape, a spherical shape, a capsule shape or a crescent shape.

[0015] As a further improved technical solution, the number of bosses in each boss ring is an even number, and the bosses in the same boss ring have the same shape.

[0016] As a further improved technical solution, the spherical radius of the side surface of the spherical cone ranges from 5 mm to 15 mm, and the diameter of the circular plane ranges from 1 mm to 7.5 mm.

[0017] As a further improved technical solution, the height range of each boss is 0.1mm-0.6mm, the arc radius of the arc surface of each boss is 0.3mm-1mm, and the arc radius of the rounded corner of each boss is 0.1mm-0.8mm.

[0018] As a further improved technical solution, the circular plane and the side surface of the spherical cone are combined to form a bonding surface between the cemented carbide substrate and the diamond layer.

[0019] In the second aspect, an embodiment of the utility model further provides a diamond composite sheet, which includes a diamond layer and a cemented carbide substrate as described above, wherein the bottom of the diamond layer is provided with a complementary structure complementary to the bonding surface, and the diamond layer is arranged on the bonding surface through the complementary structure, and the diamond layer is conical, and its taper range is 35°-55°.

[0020] Compared with the prior art, the embodiment of the present invention has the following advantages:

[0021] An embodiment of the present utility model provides a cemented carbide substrate, comprising: a base; a spherical cone, wherein the spherical cone is arranged on the top side of the base, a circular plane is provided on the top of the spherical cone, and the spherical cone, the circular plane and the base share a common central axis; a boss, wherein a plurality of bosses are provided, the top surface of each boss is an arc surface, and the edge of each boss is a rounded corner, each boss is respectively arranged on the side circumferential surface of the spherical cone and is circled to form a boss circle, and the distance between each two adjacent bosses is consistent along the circumference of the spherical cone. In the present invention, the top surface of each boss is an arc surface and the edge of each boss is rounded to form an arc surface transition at the edge of each boss. The arc surface at the top of the boss and the rounded edge can avoid the occurrence of sharp corners that damage the stress structure of the cemented carbide substrate and the diamond layer when they are combined. The force in each area can be made more uniform, which greatly reduces the stress concentration phenomenon at the hard bonding surface, effectively improves the impact resistance of the diamond composite sheet, avoids the influence of residual stress on the diamond composite sheet, thereby improving the product quality of the diamond composite sheet and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A structural schematic diagram of a first embodiment of a cemented carbide substrate provided by the present invention;

[0023] Figure 2 A top view of a first embodiment of a cemented carbide substrate provided by the present invention;

[0024] Figure 3 A side view of a first embodiment of a cemented carbide substrate provided by the present invention;

[0025] Figure 4 A schematic structural diagram of a second embodiment of a cemented carbide substrate provided by the present invention;

[0026] Figure 5 A top view of a second embodiment of a cemented carbide substrate provided by the present invention;

[0027] Figure 6 A side view of a second embodiment of a cemented carbide substrate provided by the present invention;

[0028] Figure 7 This is a structural schematic diagram of a diamond composite sheet provided by the utility model.

[0029] In the figure: 1, base; 2, spherical cone; 201, circular plane; 3, boss; 301, arc surface; 302, fillet; 4, cemented carbide substrate; 5, diamond layer. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] Example 1:

[0032] like Figures 1-6 The cemented carbide substrate 4 includes: a base 1; a spherical cone 2, which is arranged on the top side of the base 1 and has a circular plane 201 on the top of the spherical cone 2. The spherical cone 2, the circular plane 201 and the base 1 share a common central axis; and a plurality of bosses 3, each having a top surface of an arcuate surface 301 and a rounded edge 302. Each boss 3 is arranged on the side circumference of the spherical cone 2 and surrounds the spherical cone 2 to form a circle of bosses 3. Along the circumference of the spherical cone 2, the spacing between two adjacent bosses 3 is uniform.

[0033] In this embodiment, the cemented carbide substrate 4 includes a base 1, a spherical cone 2 and a boss 3; the spherical cone 2 is arranged on the top end face of the base 1, and the top of the spherical cone 2 is provided with a circular plane 201, and the spherical cone 2, the circular plane 201 and the base 1 have a common central axis; there are multiple bosses 3, and the top surface of each boss 3 is an arc surface 301, and the curvature of the arc surface 301 of each boss 3 can be different, and the edge of each boss 3 is a fillet 302, and the curvature of the fillet 302 of the edge of each boss 3 can also be different. Each boss 3 is respectively arranged on the side circumference of the spherical cone 2 and is surrounded to form a circle of bosses 3. Along the circumference of the spherical cone 2, the distance between each two adjacent bosses 3 is consistent to ensure uniform stress release. In this embodiment, the curvature of the top surface of each boss 3 is consistent and the curvature of the rounded corners 302 on the edge is also consistent, which is convenient for processing and production as well as subsequent interlocking with the diamond layer 5; in the utility model, the top surface of each boss 3 is a curved surface 301 and the edge of each boss 3 is processed with a rounded corner 302, so that the edge of each boss 3 forms a circular arc surface 301 transition. The curved surface 301 on the top of the boss 3 and the rounded corner 302 on the edge can avoid the occurrence of sharp corners that damage the stress structure of the cemented carbide substrate 4 and the diamond layer 5 when they are combined, and can make the force on each area more uniform, greatly reducing the stress concentration phenomenon at the hard bonding surface, effectively improving the impact resistance of the diamond composite sheet, avoiding the influence of residual stress on the diamond composite sheet, thereby improving the product quality of the diamond composite sheet and extending its service life.

[0034] As a further solution, the base 1 is cylindrical, and the size of the top surface of the base 1 is consistent with the size of the bottom surface of the spherical cone 2;

[0035] Specifically, the bottom surface of the spherical cone 2 is arranged opposite to the top surface of the base 1, and the two can be connected by welding, clamping, etc. or integrally formed.

[0036] As a further solution, the side surface of the spherical cone 2 is a spherical surface. With the central axis of the spherical cone 2 as the center, the side surface of the spherical cone 2 is provided with a plurality of bosses 3 circles. Along the bottom side of the base 1 to the circular plane 201, the radius of each of the bosses 3 circles gradually decreases, and the spacing between each of the bosses 3 circles is consistent.

[0037] Specifically, a plurality of the bosses 3 are scattered on the side surface of the spherical cone 2 in this embodiment, and each of the bosses 3 is evenly distributed on the side surface of the spherical cone 2, which can avoid local uneven force after the side surface of the spherical cone 2 is combined with the diamond layer 5, thereby enhancing the stability of the cemented carbide substrate 4 after the combination with the diamond layer 5.

[0038] In this embodiment, the number of bosses 3 in each of the three circles of bosses is the same, and the distance between each two adjacent bosses 3 in any of the three circles of bosses is the same, so that each local force of the spherical cone 2 is uniform, avoiding stress concentration, thereby improving the product quality of the diamond composite sheet and extending its service life.

[0039] As a further solution, the boss 3 includes an ellipsoidal shape, a spherical shape, a capsule shape or a crescent shape.

[0040] As a further improved technical solution, the number of the bosses 3 in each of the three boss circles is an even number, and the bosses 3 in the same three boss circles have the same shape;

[0041] Specifically, the number of the bosses 3 in each of the 3 circles of bosses in this embodiment is 8-16. Figure 1 As shown, all the bosses 3 on the inner layer of bosses 3 on the side surface of the spherical cone 2 are spherical, and all the bosses 3 on the outermost layer of bosses 3 are crescent-shaped. Because the force conditions at different heights of the side surface of the spherical cone 2 are different, bosses 3 of different shapes can be set at different heights of the side surface of the spherical cone 2 for adjustment, so as to better avoid stress concentration.

[0042] As a further solution, the spherical radius of the side surface of the spherical cone 2 is in the range of 5 mm to 15 mm, and the diameter of the circular plane 201 is in the range of 1 mm to 7.5 mm.

[0043] As a further improved technical solution, the height range of each boss 3 is 0.1mm-0.6mm, the arc radius of the arc surface 301 of each boss 3 is 0.3mm-1mm, and the arc radius of the rounded corner 302 of each boss 3 is 0.1mm-0.8mm.

[0044] As a further improved technical solution, the circular plane 201 and the side surface of the spherical cone 2 are combined to form the bonding surface between the cemented carbide substrate 4 and the diamond layer 5 .

[0045] Example 2:

[0046] The present utility model embodiment also provides a diamond composite sheet, which includes a diamond layer 5 and a cemented carbide substrate 4 as described in Example 1, wherein the bottom of the diamond layer 5 is provided with a complementary structure (not shown) complementary to the bonding surface, and the diamond layer 5 is arranged on the bonding surface through the complementary structure. The diamond layer 5 is conical, and its taper range is 35°-55°. Specifically, a complementary structure similar in shape to the spherical cone 2 is provided at the bottom of the diamond layer 5, and a slot corresponding to each boss 3 is provided in the complementary structure (not shown) to prevent the diamond layer 5 and the cemented carbide substrate 4 from moving relative to each other when the diamond composite sheet is in use.

[0047] In summary, an embodiment of the present utility model provides a cemented carbide substrate 4, comprising: a base 1; a spherical cone 2, wherein the spherical cone 2 is arranged on the top side of the base 1, and a circular plane 201 is provided on the top of the spherical cone 2, and the spherical cone 2, the circular plane 201 and the base 1 have a common central axis; a boss 3, wherein a plurality of bosses 3 are provided, and the top surface of each boss 3 is an arc surface 301, and the edge portion of each boss 3 is a rounded corner 302, and each boss 3 is respectively arranged on the side circumferential surface of the spherical cone 2 and is circled to form a circle of bosses 3, and along the circumference of the spherical cone 2, the distance between each two adjacent bosses 3 is consistent. In the present invention, the top surface of each boss 3 is an arc surface 301 and the edge of each boss 3 is processed with a rounded corner 302, so that the edge of each boss 3 forms an arc surface 301 transition. The arc surface 301 on the top of the boss 3 and the rounded corner 302 on the edge can avoid the occurrence of sharp corners that damage the stress structure of the cemented carbide substrate 4 and the diamond layer 5 when they are combined. The force in each area can be made more uniform, and the stress concentration phenomenon at the hard bonding surface is greatly reduced. The impact resistance of the diamond composite sheet is effectively improved, and the influence of residual stress on the diamond composite sheet is avoided, thereby improving the product quality of the diamond composite sheet and extending its service life.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0053] Of course, the description of the above embodiments of the present invention is relatively detailed, but it cannot be understood as limiting the scope of protection of the present invention. The present invention can also have many other implementation methods. Based on this implementation method, other implementation methods obtained by ordinary technicians in this field without making any creative work are all within the scope of protection of the present invention. The scope of protection of the present invention shall be based on the attached claims.

Claims

1. A cemented carbide substrate, characterized in that: include: base; A spherical cone, the spherical cone is arranged on the top side of the base, the top of the spherical cone is provided with a circular plane, and the spherical cone, the circular plane and the base share a central axis; There are multiple bosses, the top surface of each boss is an arc surface, and the edge of each boss is a rounded corner. Each boss is respectively arranged on the side surface of the spherical cone and is circled to form a boss circle. Along the circumference of the spherical cone, the distance between each two adjacent bosses is consistent.

2. The cemented carbide substrate according to claim 1, characterized in that The base is cylindrical, and the size of the top surface of the base is consistent with the size of the bottom surface of the spherical cone.

3. The cemented carbide substrate according to claim 1, characterized in that The side surface of the spherical cone is a sphere. With the central axis of the spherical cone as the center, the side surface of the spherical cone is provided with a plurality of boss rings. Along the bottom side of the base to the circular plane, the radius of each boss ring gradually decreases, and the spacing between each boss ring is consistent.

4. The cemented carbide substrate according to claim 3, characterized in that The number of bosses in each boss circle is the same, and the distance between each two adjacent bosses in any boss circle is the same.

5. The cemented carbide substrate according to claim 3, characterized in that The boss includes an ellipsoidal shape, a spherical shape, a capsule shape or a crescent shape.

6. The cemented carbide substrate according to claim 5, characterized in that The number of the bosses in each boss circle is an even number, and the bosses in the same boss circle have the same shape.

7. The cemented carbide substrate according to claim 3, characterized in that The spherical radius of the side surface of the spherical cone ranges from 5 mm to 15 mm, and the diameter of the circular plane ranges from 1 mm to 7.5 mm.

8. The cemented carbide substrate according to claim 1, characterized in that The height of each boss is in the range of 0.1mm-0.6mm, the arc radius of the arc surface of each boss is in the range of 0.3mm-1mm, and the arc radius of the rounded corner of each boss is in the range of 0.1mm-0.8mm.

9. The cemented carbide substrate according to any one of claims 1 to 8, characterized in that The circular plane and the side surface of the spherical cone are combined to form a bonding surface between the cemented carbide substrate and the diamond layer.

10. A diamond composite sheet, characterized in that: It comprises a diamond layer and a cemented carbide substrate as claimed in claim 9, wherein the bottom of the diamond layer is provided with a complementary structure complementary to the bonding surface, the diamond layer is arranged on the bonding surface through the complementary structure, and the diamond layer is conical with a taper range of 35°-55°.

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