Cylindrical polycrystalline diamond compact

Abstract

The utility model discloses a cylindrical polycrystalline diamond compact. The cylindrical polycrystalline diamond compact comprises an alloy substrate and a diamond layer, the alloy base body comprises a base and a diamond combination column extending in the central axis direction of the base. The diamond layer is of an annular structure arranged on the periphery of the diamond combination column in a sleeving mode, and the diameter of the diamond combination column is the same as that of an inner hole of the diamond layer. The height of the diamond combination column is larger than that of the base, the top face of the diamond layer is flush with the top face of the diamond combination column, and the bottom face of the diamond layer is connected with the base. The whole compact is cylindrical, the base is arranged at the bottom of the compact and connected with the diamond combination column in the central axis direction, the inverted-T-shaped structure has good symmetry and structural stability, and the cylindrical compact facilitates reasonable arrangement of a chip removal space; metal chips in the cutting process of the tool can be smoothly discharged in the axial direction or the radial direction of the tool, the risk of chip resistance and built-up edge formation is remarkably reduced, and therefore the machining efficiency and the smoothness of a cutting face are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a diamond compact technical field especially relates to a cylindrical polycrystalline diamond compact. BACKGROUND

[0002] Diamond cutters are widely used in the processing of metal, non-metal hard and brittle materials due to their high hardness and wear resistance, low friction coefficient, high elastic modulus, high thermal conductivity, low thermal expansion coefficient, and small affinity with non-ferrous metals, such as graphite, high wear-resistant materials, composite materials, hard alloys, non-metals, ceramics and other materials. As a kind of high-performance material, polycrystalline diamond compact (PDC) is widely used in cutting, grinding, drilling and other high-strength operation fields. Polycrystalline diamond has extremely high hardness and can maintain strong wear resistance under extreme working conditions, becoming an important part of many high-end equipment. The existing polycrystalline diamond compact usually adopts a laminated structure, which includes the alternating arrangement of multiple diamond layers and metal matrix layers to form a composite material. However, in actual use, the compact is often affected by external forces, resulting in uneven stress on the structure. For example, in high-load environments such as high-speed cutting and drilling, external forces generate large stress on the surface and inside of the compact, especially in the transition area between the diamond layer and the metal matrix, which can easily cause stress concentration, forming cracks or delamination, thereby affecting the service life of the compact. In extreme working conditions, the compact may encounter sudden temperature changes, high pressure or strong impact, which can weaken the bonding force between the diamond layer and the metal matrix, causing the diamond layer to peel off.

[0003] In addition, the existing polycrystalline diamond compact usually requires a complex manufacturing process. In order to avoid interlayer separation of the compact due to thermal stress or mechanical stress during preparation, not only precise temperature control and pressure control are required, but also a large number of post-processing steps such as surface treatment and finishing are required, increasing production cost and manufacturing difficulty.

[0004] Therefore, further optimization is needed to solve the above problems in the prior art. UTILITY MODEL CONTENT

[0005] Therefore, in order to solve the above problems in the prior art, the purpose of the utility model is to provide a cylindrical polycrystalline diamond compact.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A cylindrical polycrystalline diamond compact, comprising an alloy base and a diamond layer; the alloy base comprises a base and a diamond bonding column extending along the central axis direction of the base; the diamond layer is an annular structure sleeved on the outer periphery of the diamond bonding column, and the diameter of the diamond bonding column is the same as the inner hole diameter of the diamond layer; the height of the diamond bonding column is greater than the height of the base, the top surface of the diamond layer is flush with the top surface of the diamond bonding column, and the bottom surface of the diamond layer is connected with the base.

[0008] Further, the thickness of the diamond layer is less than the diameter of the diamond bonding column, and the outer peripheral wall of the diamond layer is flush with the outer peripheral wall of the base.

[0009] Further, the thickness of the diamond layer is 0.5-3mm.

[0010] Further, the diameter of the diamond bonding column is 4-25mm.

[0011] Further, the diameter of the diamond bonding column gradually decreases away from the base.

[0012] Further, the height ratio of the base to the diamond bonding column is 1: (4-5).

[0013] Further, the base and the diamond bonding column are integrally formed in an inverted "T" shape, and the diamond bonding column is located at the center position of the base.

[0014] Further, the diamond layer is a polycrystalline diamond layer formed by high-temperature and high-pressure treatment of mixed powder of diamond particles and binder in a metal cup; the mixed powder of diamond particles and binder is filled in the space between the hard alloy base and the metal cup.

[0015] Further, the particle size of the diamond particles is greater than the particle size of the binder.

[0016] Further, the alloy base is a hard alloy base prepared from tungsten-cobalt-based hard alloy or tungsten-titanium-cobalt-based hard alloy.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] 1) The compact of the utility model is cylindrical as a whole, the base is provided at the bottom and connected with the diamond bonding column in the central axis direction, the inverted "T" structure has good symmetry and structural stability, so that it can be adapted to various blade structure design schemes in applications such as cutting tools, such as turning tools, drills and milling cutters, and the structural versatility and use flexibility are significantly improved.

[0019] Further, the diamond bonding column extends upward along the central axis of the base to form a column structure higher than the base, providing sufficient axial support length, effectively enhancing the overall strength and rigidity of the composite sheet during clamping, welding or high load cutting, while the diamond layer is a ring structure sleeved around the outer periphery of the diamond bonding column, and the inner hole size is strictly matched with the contour of the bonding column to ensure tight fit, improve the bonding strength and structural integrity between the diamond layer and the alloy matrix, and avoid peeling or cracking under high stress or high frequency impact conditions; at the same time, excellent dynamic balance performance is realized during rotation, effectively inhibiting vibration and jumping problems caused by eccentricity during cutting process, improving machining precision and surface quality.

[0020] 2) The cylindrical composite sheet of the utility model is more suitable for matching and embedding with multiple types of cutting tool heads, has higher assembly compatibility, and is convenient for surrounding the circumference to build multiple blade openings and multiple angle cutting designs, so that the blade form is more diverse. With the excellent hardness and wear resistance of polycrystalline diamond material, the service life of the tool is much higher than that of traditional alloy materials, and excellent use stability and economy are exhibited in high-strength and high-speed cutting applications. The structure of the utility model makes the forming area of the diamond layer clear, and the raw material can be quickly filled and positioned without complex positioning process, which significantly improves the operation convenience and processing efficiency in the production process and reduces the manufacturing difficulty.

[0021] 3) In addition, the cylindrical outer contour structure is beneficial to the reasonable arrangement of the chip space, so that the metal chips generated during the cutting process of the tool can be smoothly discharged along the axial or radial direction of the tool, significantly reducing the risk of chip resistance and built-up edge formation, thereby improving the machining efficiency and the smoothness of the cutting surface. The overall structure not only has strong adaptability, perfect function, but also simplifies the interface design between the composite sheet and the tool body, improves the machining and assembly efficiency and the structural reliability, has good engineering practical value and industrial popularization prospect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an overall structure schematic view of the cylindrical polycrystalline diamond composite sheet of the utility model embodiment 1.

[0023] Figure 2 It is an overall structure exploded view schematic view of the cylindrical polycrystalline diamond composite sheet of the utility model embodiment 1.

[0024] Figure 3 It is a front view schematic view of the overall structure of the cylindrical polycrystalline diamond composite sheet of the utility model embodiment 1.

[0025] Figure 4 It is a schematic view of the overall structure of the cylindrical polycrystalline diamond composite sheet of the utility model embodiment 1. Figure 3 It is a schematic view of the overall structure of the cylindrical polycrystalline diamond composite sheet of the utility model embodiment 1.

[0026] Figure 5 It is the overall structure of the cylindrical polycrystalline diamond compact of the embodiment 1 of the utility model, and reference is made to the physical diagram.

[0027] Figure 6 It is the overall structure of the cylindrical polycrystalline diamond compact of the embodiment 2 of the utility model, and reference is made to the physical diagram.

[0028] Figure 7 It is the exploded view of the overall structure of the cylindrical polycrystalline diamond compact of the embodiment 2 of the utility model.

[0029] Figure 8 It is the front view of the overall structure of the cylindrical polycrystalline diamond compact of the embodiment 2 of the utility model.

[0030] Figure 9 It is the Figure 8 It is the sectional structure of the B-B direction.

[0031] Figure 10 It is the alloy base structure of the cylindrical polycrystalline diamond compact of the embodiment 2 of the utility model.

[0032] In the drawing,

[0033] 1, alloy base; 11, base; 12, diamond bonding column; 2, diamond layer; L1, thickness of the diamond layer; L2, base height; L3, height of the diamond bonding column; R1, diameter of the diamond bonding column. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the utility model, the technical scheme and advantages of the utility model are further described in detail below in combination with the drawings and embodiments. The specific structure and characteristics of the utility model are described below by way of example, which should not constitute any limitation on the utility model. At the same time, any one of the technical features mentioned below (including implied or disclosed), as well as any one of the technical features directly shown or implied in the drawings, can be further combined or deleted between these technical features, so as to form more other embodiments that may not be directly or indirectly mentioned in the utility model. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms, and is not limited to the embodiments described herein.

[0035] In the description of the utility model, unless otherwise stated, the components used are conventional components in the prior art.

[0036] Embodiment 1

[0037] As Figures 1-5The utility model provides a cylindrical polycrystal diamond compact, including alloy base body 1 and diamond layer 2, alloy base body 1 includes base 11 and diamond binding column 12 along the central axis direction of base 11 extension, specifically, base 11 with diamond binding column 12 is inverted " T " shape integral forming, diamond binding column 12 is located the central position of base 11, alloy base body 1 is the hard alloy base body 1 prepared by tungsten cobalt hard alloy or tungsten titanium cobalt hard alloy, has good strength, toughness and thermal conductivity, can effectively bear the cutting load of polycrystal diamond layer 2, and maintains structural stability under high temperature environment, prevents tool fracture or broken edge.

[0038] Diamond layer 2 is annular structure that is sleeved on the periphery of diamond binding column 12, and the contour of diamond binding column 12 is strictly matched with the inner hole size of diamond layer 2, in this way, diamond binding column 12 and base 11 form inverted " T " shape structure along the central axis, have good symmetry and structural stability, can effectively disperse the radial and axial stress generated in the cutting process, prevent fracture or drop caused by local stress concentration, further, diamond layer 2 is annularly sleeved on the periphery of binding column, and the inner hole is accurately matched with the contour of binding column, and it is not easy to produce debonding in high temperature and high pressure sintering or subsequent use process, improve the overall use reliability of the compact, in the embodiment, cylindrical outer contour structure is favorable for the reasonable arrangement of chip removal space, so that the metal chips generated in the tool cutting process can be smoothly discharged along the axial direction or radial direction of the tool, significantly reduce the chip resistance and the risk of forming chip tumor, thereby improving the machining efficiency and the smoothness of the cutting surface, the overall structure not only has strong adaptability, perfect function, but also simplifies the interface design between the compact and the tool body, improves the machining and assembling efficiency and structural reliability.

[0039] The height L3 of diamond binding column 12 is greater than the height L2 of base 11, the top surface of diamond layer 2 is flush with the top surface of diamond binding column 12, and the bottom surface of diamond layer 2 is connected with base 11, in the embodiment, the height of diamond binding column is greater than the height of base, the top surface of diamond layer is flush with the top surface of diamond binding column, and the bottom surface of diamond layer is connected with base, which significantly improves the stability, wear resistance and machining efficiency of the diamond compact, the higher design of diamond binding column increases the contact area of diamond layer and binding column, improves the load capacity of the compact, and avoids damage or drop caused by force concentration, at the same time, the top surface of diamond layer is flush with the top surface of diamond binding column, so that the diamond layer can be uniformly distributed, and the cutting ability and durability thereof are enhanced, the design that the bottom surface is connected with the base simplifies the manufacturing process, reduces the production difficulty, improves the machining efficiency, and meets the needs of batch production.

[0040] Optionally, the thickness L1 of the diamond layer 2 is less than the diameter R1 of the diamond bonding column 12, and the outer peripheral wall of the diamond layer 2 is flush with the outer peripheral wall of the base 11. This arrangement can effectively avoid the problems of stress concentration and structural weakness caused by the protrusion of the diamond layer 2, enhance the impact resistance of the overall structure, and ensure the flatness and assembly compatibility of the overall cylindrical side wall, facilitating the embedding of various tool head structures.

[0041] Optionally, the thickness of the diamond layer 2 is 0.5-3mm; the diameter of the diamond bonding column 12 is 4-25mm. The height ratio of the base 11 to the diamond bonding column 12 is 1:(4-5). In this embodiment, the thickness of the diamond layer 2 is controlled within the range of 0.5-3mm, which can provide a high wear-resistant surface layer while avoiding uneven sintering or stress accumulation caused by excessive layer thickness, thereby ensuring the density and stability of the polycrystalline layer; the diameter of the bonding column is controlled within the range of 4-25mm, which is sufficient to support the diamond layer 2 and provide good mechanical support, thereby enhancing the impact resistance and thermal stability of the overall structure; the combined structure has a reasonable size design, which can effectively enhance the support strength of the bonding column and the impact resistance of the overall structure while ensuring that the diamond layer 2 has good wear resistance, especially under high-speed and high-load cutting conditions, exhibiting excellent mechanical stability and thermal stress coordination ability, further improving the service life and adaptability of the composite sheet, and facilitating size control and product consistency during the manufacturing process.

[0042] Optionally, the diamond layer 2 is a polycrystalline diamond layer 2 formed by high-temperature and high-pressure treatment of a mixture of diamond particles and binder powder in a metal cup; the mixture of diamond particles and binder powder is filled in the space between the cemented carbide substrate 1 and the metal cup. In this embodiment, the inverted T-shaped cemented carbide substrate 1 and the annular diamond layer 2 make the forming area of the diamond layer 2 clear and enable the rapid filling and alignment of raw materials with a complex positioning process, significantly improving the operation convenience and processing efficiency during the production process, and reducing the manufacturing difficulty.

[0043] Further refinement, the particle size of the diamond particles is greater than the particle size of the binder. Large-diameter diamond particles provide stronger cutting edge retention and wear resistance, and small-diameter binders can better fill the gaps between the particles, achieve a dense structure and enhance the overall bonding strength, thereby improving the stability and service life of the composite sheet under heavy load cutting.

[0044] Example 2

[0045] As shown in Figures 6-10 the difference between this embodiment 2 and embodiment 1 is that the diameter of the diamond bonding column gradually decreases away from the base, and the minimum diameter is still greater than the thickness of the diamond layer.

[0046] That is, the diamond bond post adopts a conical design, which can effectively improve the stress distribution. Specifically, the conical structure effectively avoids stress concentration by gradually reducing the diameter, thereby greatly improving the breaking resistance of the composite sheet, especially in high cutting force and high speed rotation applications, showing more excellent durability and reliability.

[0047] In addition, the conical structure also brings better machining stability. Because the conical design helps to balance the mechanical cooperation between the diamond layer and the substrate, the overall structure is more stable. During production, the shape of the conical structure makes the diamond bond post more closely combined with the substrate, reduces the machining error, and improves the production precision.

[0048] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. For those skilled in the art, it can be understood that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A cylindrical polycrystalline diamond composite sheet, characterized in that, The system includes an alloy matrix and a diamond layer; the alloy matrix includes a base and a diamond bonding post extending along the central axis of the base; the diamond layer is an annular structure sleeved on the outer periphery of the diamond bonding post, and the outline of the diamond bonding post matches the inner hole of the diamond layer; the height of the diamond bonding post is greater than the height of the base, the top surface of the diamond layer is flush with the top surface of the diamond bonding post, and the bottom surface of the diamond layer is in contact with the base.

2. The cylindrical polycrystalline diamond composite sheet as described in claim 1, characterized in that, The thickness of the diamond layer is less than the diameter of the diamond bonding post, and the outer peripheral wall of the diamond layer is flush with the outer peripheral wall of the base.

3. The cylindrical polycrystalline diamond composite sheet as described in claim 2, characterized in that, The thickness of the diamond layer is 0.5-3 mm.

4. The cylindrical polycrystalline diamond composite sheet as described in claim 3, characterized in that, The diameter of the diamond-bonded post is 4-25 mm.

5. The cylindrical polycrystalline diamond composite sheet as described in claim 4, characterized in that, The diameter of the diamond bonding post gradually decreases in the direction away from the base.

6. The cylindrical polycrystalline diamond composite sheet as described in claim 4, characterized in that, The ratio of the height of the base to the height of the diamond bonding post is 1:(4-5).

7. The cylindrical polycrystalline diamond composite sheet as described in claim 1, characterized in that, The base and the diamond bonding post are integrally formed in an inverted "T" shape, with the diamond bonding post located at the center of the base.

8. The cylindrical polycrystalline diamond composite sheet as described in claim 7, characterized in that, The diamond layer is a polycrystalline diamond layer formed by high temperature and high pressure treatment of a mixture of diamond particles and binder powder inside a metal cup; the mixture of diamond particles and binder powder fills the space between the cemented carbide substrate and the metal cup.

9. The cylindrical polycrystalline diamond composite sheet as described in claim 8, characterized in that, The diamond particles have a larger particle size than the binder.

10. The cylindrical polycrystalline diamond composite sheet as described in claim 9, characterized in that, The alloy matrix is ​​a hard alloy matrix prepared from tungsten-cobalt hard alloys or tungsten-titanium-cobalt hard alloys.

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