Hard alloy matrix for diamond compact

Abstract

The hard alloy matrix for the diamond compact comprises a cylindrical base and a plurality of boss ring sets, the boss ring sets are coaxially arranged on the surface of the cylindrical base, each boss ring set comprises a plurality of prismatic tables, first round corners are arranged on the top walls of the prismatic tables and the corners of the side walls of the prismatic tables, and second round corners are arranged on the top walls of the prismatic tables and the corners of the side walls of the prismatic tables. The joint of the prismatic table and the cylindrical base is transited through a first fillet; the top wall and the plurality of side walls of the prismatic table are arranged as the bonding surfaces of the diamond layer, and the plurality of prismatic tables are arranged on the surface of the cylindrical base, so that the contact area between the diamond layer and the hard alloy matrix is increased, the bonding force between the diamond layer and the hard alloy matrix is effectively improved, and the internal stress of the diamond compact is reduced; and meanwhile, the peripheral surfaces of the prismatic tables are subjected to round corner treatment to form cambered surface transition, so that the stress structure is prevented from being damaged by sharp corners when the hard alloy matrix is combined with the diamond layer, and the impact resistance of the diamond compact is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of superhard materials technology, specifically to a cemented carbide matrix for diamond composite sheets. Background Technology

[0002] Diamond composite sheets are a superhard material synthesized from synthetic diamond micropowder and cemented carbide under high temperature and pressure. They not only have the high wear resistance and high hardness of diamond, but also the excellent impact resistance and weldability of cemented carbide. Therefore, they are widely used in fields such as oil drilling, natural gas extraction and geological drilling.

[0003] Due to the difference in thermal expansion coefficients between diamond and cemented carbide matrix, residual stress is usually concentrated at the interface of the composite sheet after high temperature and high pressure calcination and cooling. This residual stress can cause cracks or even delamination at the interface between the diamond layer and the cemented carbide layer. For example, the utility model patent with announcement number CN202380982U discloses a "frustum-shaped diamond-cement composite sheet", in which the interface between the diamond layer and the cemented carbide matrix layer is the outer side of the frustum and the surface of the frustum. This results in a small contact area between the diamond layer and the cemented carbide matrix layer, resulting in a weak bonding force between the two. During operation, this can easily accelerate the wear of the diamond layer and even cause the diamond layer to fall off.

[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a cemented carbide matrix for diamond composite sheets, which aims to solve the problem that sharp corners and stress concentrations exist between the diamond layer and the cemented carbide matrix layer in the prior art, resulting in reduced impact resistance of the composite sheet.

[0006] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0007] A cemented carbide matrix for diamond composite sheets, comprising:

[0008] Cylindrical base;

[0009] Multiple boss ring groups are coaxially disposed on the surface of the base; each boss ring group includes multiple frustums, which are arranged radially, and the top wall and multiple side walls of the frustums are provided with first rounded corners. The connection between the frustums and the cylindrical base is transitioned through the first rounded corners. The top wall and multiple side walls of the frustums are the bonding surfaces with the diamond layer.

[0010] Furthermore, a groove is provided on the top of the frustum, the groove being located at the center of the frustum and extending radially through the frustum along the cylindrical base.

[0011] Furthermore, the corners of the sidewalls of the groove are all provided with a second rounded corner.

[0012] Furthermore, the width of the groove is 1 / 3 to 1 / 2 of the width of the frustum surface, and the height of the groove is 1 / 3 to 1 / 2 of the width of the frustum surface.

[0013] Furthermore, the diameters of the first fillet and the second fillet are 0.1-1.0 mm.

[0014] Furthermore, the sidewalls of the frustum near the center of the cylindrical base and the sidewalls away from the center of the cylindrical base are both arc-shaped, and the frustum has a certain taper along the two sidewalls of the circumference of the cylindrical base, the taper being 5°-20°.

[0015] Furthermore, a mating post is provided at the center of the surface of the cylindrical base, the top of the mating post is provided with a third rounded corner, and the connection between the mating post and the cylindrical base is provided with a fourth rounded corner.

[0016] Furthermore, the height of the frustum located in the same boss ring group gradually increases or decreases along the circumferential direction of the cylindrical base.

[0017] Furthermore, the heights of the frustums in the multiple boss ring assemblies are not the same.

[0018] Furthermore, the diamond composite sheet has a cemented carbide substrate with 2-8 boss ring groups, and each boss ring group has 4-16 truncated pyramids.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] In this invention, multiple boss rings are coaxially arranged on the surface of the cylindrical base. Each boss ring includes multiple frustums, which are arranged radially with a certain distance between adjacent frustums. The top wall and multiple side walls of the frustums are provided with first rounded corners to avoid sharp angles on the frustums. The connection between the frustums and the cylindrical base is transitioned through the first rounded corners. By setting the top wall and multiple side walls of the frustums as the bonding surface of the diamond layer, and providing multiple frustums on the surface of the cylindrical base, the contact area between the diamond layer and the cemented carbide matrix is ​​increased, effectively improving the bonding force between the diamond layer and the cemented carbide matrix and reducing the internal stress of the diamond composite sheet. At the same time, the outer circumference of the frustums is rounded to form an arc transition to avoid sharp corners that would damage the stress structure when the cemented carbide matrix and the diamond layer are bonded. This effectively improves the impact resistance of the diamond composite sheet, avoids the influence of residual stress on the composite sheet, thereby improving the product quality of the diamond composite sheet and extending its service life. Attached Figure Description

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

[0022] Figure 2 for Figure 1 Enlarged diagram of point A in the diagram.

[0023] Figure 3 This is a schematic diagram of the first arrangement of the grooves in the boss ring assembly of this utility model.

[0024] Figure 4 This is a schematic diagram of the second arrangement of the grooves in the boss ring assembly of this utility model.

[0025] The numbers in the diagram represent: 1. Cylindrical base; 2. Boss ring assembly; 21. Frustum; 22. Groove; 3. Mating column. Detailed Implementation

[0026] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In the existing technology, only a frustum is set on the surface of the cemented carbide substrate, and the diamond layer covers the surface of the frustum. The contact surface between the two is only the arc-shaped outer surface of the frustum and the top wall of the frustum, resulting in a small contact area between the diamond layer and the cemented carbide substrate.

[0030] In view of the shortcomings of the prior art, this embodiment provides a cemented carbide substrate for diamond composite sheets, as detailed below:

[0031] As attached Figure 1 As shown, a cemented carbide substrate for diamond composite sheets includes a cylindrical base 1 and multiple boss ring groups 2. Multiple boss ring groups 2 are coaxially arranged on the surface of the cylindrical base 1. Each boss ring group 2 includes multiple frustums 21, which are arranged radially. Adjacent frustums 21 maintain a certain distance from each other. The top wall and multiple side walls of each frustum 21 are provided with first rounded corners to avoid sharp angles on the frustum 21. The connection between the frustum 21 and the cylindrical base 1 is transitioned through the first rounded corners. The top wall and multiple side walls of the frustum 21 are the bonding surfaces with the diamond layer. By adjusting the top wall of the frustum 21... The cylindrical base 1 has multiple sidewalls that form the bonding surfaces of the diamond layer, and multiple frustums 21 on its surface. This increases the contact area between the diamond layer and the cemented carbide matrix, effectively improving the bonding force between the diamond layer and the cemented carbide matrix and reducing the internal stress of the diamond composite sheet. At the same time, the outer circumference of the frustums 21 is rounded to form an arc transition, so as to avoid sharp corners that would damage the stress structure when the cemented carbide matrix and the diamond layer are bonded. This effectively improves the impact resistance of the diamond composite sheet, avoids the influence of residual stress on the composite sheet, thereby improving the product quality of the diamond composite sheet and extending its service life.

[0032] In this embodiment, multiple boss ring groups 2 surround the surface of the cylindrical base 1 and are arranged coaxially with the cylindrical base 1. Each boss ring group 2 includes multiple frustums 21, which are arranged radially. Each frustum 21 has six faces, with its bottom face connected to the cylindrical base 1 and the two being arranged as a single unit. The other five faces of the frustum 21 are bonding faces. The cross-section of the frustum 21 gradually increases from top to bottom, thereby increasing the bonding area between the cemented carbide matrix and the diamond layer.

[0033] The annular arrangement of the frustums 21 ensures a continuous, ring-shaped distribution of the diamond layer at the interface with the cemented carbide substrate, resulting in a more uniform and stable bond compared to a dispersed or irregular arrangement. This continuous annular structure helps improve the adhesion strength of the diamond layer to the substrate, reduces stress concentration points at the interface, lowers the risk of localized diamond layer detachment, and thus extends the tool's service life.

[0034] When the tool is working, the annularly arranged frustums 21 can evenly distribute the external force across the entire mating surface. Because the multiple frustums 21 are annular, no matter which direction the tool is subjected to force, the force can be transmitted relatively evenly to the diamond layer and the cemented carbide matrix through the annular frustum structure 21, avoiding problems such as diamond layer cracking or matrix deformation caused by stress concentration, and improving the overall strength and reliability of the tool.

[0035] During implementation, the diamond layer can be cylindrical or irregularly shaped, with the irregular shape being a structure designed according to the application scenario. The diamond layer cooperates with the top surface and four sides of multiple frustums 21 to form a diamond composite sheet. The top of the frustum 21 is a planar structure, and the frustums 21 of multiple boss ring groups 2 form a circular plane. This purely planar structure can enhance the bonding strength between the cemented carbide matrix and the diamond layer to a certain extent and reduce the internal stress of the diamond composite sheet.

[0036] In this embodiment, the height of the frustum 21 ranges from 0.1 to 1.0 mm, and the width ranges from 0.5 to 6 mm; the side of the frustum 21 forms a certain angle with the surface of the frustum 21, with the angle ranging from 30° to 80°.

[0037] One embodiment of this application is shown in the appendix. Figure 1 and attached Figure 2 As shown, a groove 22 is provided on the top of the frustum 21, and the groove 22 is located at the center of the frustum 21 and extends through the frustum 21 radially along the cylindrical base 1.

[0038] The groove 22 can increase the bonding area between the cemented carbide matrix and the diamond layer, and can also alleviate the concentration of thermal stress, thereby further improving the impact resistance and lifespan of the diamond composite sheet.

[0039] In this embodiment, as shown in the appendix Figure 1 Appendix Figure 3 and attached Figure 4 As shown, the prism 21 in each boss ring group 2 may or may not have a groove 22, or may be set alternately or at intervals of multiple boss ring groups 2.

[0040] In this embodiment, the shape of the groove 22 can be one or more combinations of trapezoidal, rectangular or semi-circular to adapt to different stress distributions and bonding requirements.

[0041] In this embodiment, as shown in the appendix Figure 2 As shown, the corners of the sidewalls of the groove 22 are all provided with a second rounded corner.

[0042] By setting a second fillet, the stress at the groove 22 can be further dispersed to prevent cracks from forming due to stress concentration; and the machining accuracy of the second fillet can be controlled within a set range to ensure the consistency of stress dispersion effect.

[0043] In this embodiment, the width of the groove 22 is 1 / 3 to 1 / 2 of the surface width of the frustum 21, and the height of the groove 22 is 1 / 3 to 1 / 2 of the surface width of the frustum 21.

[0044] The width of the surface of the frustum 21 is the length of the frustum 21 along the circumference of the cylindrical base 1, and the height of the frustum 21 is the distance between the surface of the frustum 21 and the surface of the cylindrical base 1. By optimizing the size ratio of the groove 22, the bonding area with the diamond layer and the stress buffer space are maximized while ensuring the structural strength of the frustum 21.

[0045] In this embodiment, the diameters of the first fillet and the second fillet are 0.1-1.0 mm.

[0046] Furthermore, by controlling the precision of the first and second fillets, the stability and consistency of the stress dispersion effect can be ensured; at the same time, by controlling the surface roughness of the first and second fillets, the surface quality can be improved, further reducing the possibility of stress concentration.

[0047] In one embodiment of this application, the side wall of the frustum 21 near the center of the cylindrical base 1 and the side wall away from the center of the cylindrical base 1 are both arc surfaces, and the frustum 21 has a certain taper along the two side walls of the circumference of the cylindrical base 1, with a taper of 5°-20°.

[0048] The curved surface not only increases the contact area between the diamond layer and the cemented carbide layer, but also helps to improve stress distribution and make stress more evenly transmitted; while the two side walls of the frustum 21 along the circumference of the cylindrical base 1 are tapered, which can optimize the bonding angle between the frustum 21 and the diamond layer and reduce stress concentration at the bonding point.

[0049] One embodiment of this application is shown in the appendix. Figure 1 As shown, a mating post 3 is provided at the center of the surface of the cylindrical base 1, the top of the mating post 3 is provided with a third rounded corner, and the connection between the mating post 3 and the cylindrical base 1 is provided with a fourth rounded corner.

[0050] The column 3 and multiple frustums 21 are used to connect with the diamond layer. By setting a third rounded corner on its top and a fourth rounded corner at the connection with the cylindrical base 1, stress concentration can be better reduced.

[0051] In one embodiment of this application, the height of the frustum 21 located in the same boss ring group 2 gradually increases or decreases along the circumferential direction of the cylindrical base 1 to form a height gradient change. This height gradient change helps to balance the distribution of thermal stress during sintering and reduce the accumulation of residual stress.

[0052] In one embodiment of this application, the heights of the truncated pyramids 21 of the plurality of boss ring groups 2 are not the same.

[0053] The height of the multiple frustums 21 in each boss ring group 2 is the same, while the height of the frustums 21 in adjacent boss ring groups 2 may be the same or different, depending on the manufacturing process or usage requirements.

[0054] In one embodiment of this application, the cemented carbide substrate of the diamond composite sheet is provided with 2-8 boss ring groups 2, and each boss ring group 2 is provided with 4-16 truncated pyramids 21.

[0055] By rationally selecting the number of boss ring group 2 and truncated pyramid 21, the bonding structure and stress distribution between the matrix and the diamond layer are optimized; the boss ring group 2 and truncated pyramid 21 are arranged in an equal or variable spacing manner to meet different mechanical properties and bonding strength requirements.

[0056] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

Claims

1. A cemented carbide matrix for diamond composite sheets, characterized in that, include: Cylindrical base; Multiple boss ring groups are coaxially disposed on the surface of the base; each boss ring group includes multiple frustums, which are arranged radially, and the top wall and multiple side walls of the frustums are provided with first rounded corners. The connection between the frustums and the cylindrical base is transitioned through the first rounded corners. The top wall and multiple side walls of the frustums are the bonding surfaces with the diamond layer.

2. The cemented carbide matrix for diamond composite sheets according to claim 1, characterized in that, The top of the frustum is provided with a groove, which is located at the center of the frustum and extends radially through the frustum along the cylindrical base.

3. The cemented carbide matrix for diamond composite sheets according to claim 2, characterized in that, The corners of the sidewalls of the groove are all provided with a second rounded corner.

4. The cemented carbide matrix for diamond composite sheets according to claim 2, characterized in that, The width of the groove is 1 / 3 to 1 / 2 of the width of the frustum surface, and the height of the groove is 1 / 3 to 1 / 2 of the height of the frustum surface.

5. The cemented carbide matrix for diamond composite sheets according to claim 3, characterized in that, The diameters of the first fillet and the second fillet are 0.1-1.0 mm.

6. The cemented carbide matrix for diamond composite sheets according to claim 1, characterized in that, The sidewalls of the frustum near the center of the cylindrical base and the sidewalls away from the center of the cylindrical base are both arc-shaped. The frustum has a certain taper along the two sidewalls of the circumference of the cylindrical base, and the taper is 5°-20°.

7. The cemented carbide matrix for diamond composite sheets according to claim 1, characterized in that, A mating post is provided at the center of the surface of the cylindrical base, the top of the mating post is provided with a third rounded corner, and the connection between the mating post and the cylindrical base is provided with a fourth rounded corner.

8. The cemented carbide matrix for diamond composite sheets according to claim 1, characterized in that, The height of the frustum located in the same boss ring group gradually increases or decreases along the circumferential direction of the cylindrical base.

9. The cemented carbide matrix for diamond composite sheets according to claim 1, characterized in that, The heights of the frustums in the multiple boss ring assemblies are not the same.

10. The cemented carbide matrix for diamond composite sheets according to claim 1, characterized in that, The diamond composite sheet has a cemented carbide substrate with 2-8 boss ring groups, and each boss ring group has 4-16 truncated pyramids.

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