Hard alloy matrix applied to polycrystalline diamond compact

Abstract

The utility model belongs to the technical field of diamonds, and particularly relates to a hard alloy matrix applied to a polycrystalline diamond compact, which comprises a matrix body, a first boss is arranged at one end of the matrix body, a plurality of second bosses are arranged on the circumference of the side of the first boss, and a wedge-shaped structure is formed between every two adjacent second bosses. The trend of the wedge-shaped structure is that the middle part of each second boss is taken as the highest point and the wedge-shaped structure is lowered between the two second bosses; the inner end of the second boss is fixedly connected with the first boss, a convex-concave structure is formed through the bosses, a wedge-shaped structure is further formed based on the bosses, and stress concentration of the combination portion of diamond particles and alloy is dispersed. The bosses are connected to form an integral structure, so that the integrity is improved, the service life is prolonged, and the product performance is comprehensively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of diamonds, and in particular relates to a hard alloy matrix used for polycrystalline diamond composite sheets. Background Art

[0002] Diamond composite (PDC) is a high-performance superhard material made by sintering natural or artificial diamond powder with a cemented carbide matrix under high temperature and high pressure conditions. It is widely used in oil drilling, geological exploration, mining, road construction and other fields due to its excellent wear resistance and ability to maintain sharpness.

[0003] The effective design of the alloy matrix helps to improve the stress distribution at the junction of diamond particles and alloy, enhance the fracture resistance and fatigue resistance of the composite sheet, and play a positive role in improving the overall mechanical properties and service life of the diamond composite sheet.

[0004] For diamond composite sheets that bear cutting loads, the prior art often designs a bump structure on the end face of the alloy substrate. For example, CN201721757964.6, CN201721427772.9, US6962218B2, and US7287610B2 ​​have a bump structure arranged in a circular array on the cross section, and the multi-layer annular step structure of CN201822206758.7 is used to improve the stress distribution of diamond particles in the shear direction and reduce the tangential stress concentration at the diamond / alloy interface. However, there is a problem that the bumps are arranged at intervals to form a convex-concave structure, the integrity is poor, and the service life is short. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a cemented carbide substrate applied to polycrystalline diamond composite sheets.

[0006] The purpose of the utility model is achieved in the following way: a cemented carbide substrate used for polycrystalline diamond composite sheets, including a substrate body 1, a first boss 6 is arranged at one end of the substrate body 1, a plurality of second bosses 21 are arranged on the lateral circumference of the first boss 6, a wedge-shaped structure is formed between two adjacent second bosses 21, and the trend of the wedge-shaped structure is from the middle of each second boss 21 as the highest point to the lower part between the two second bosses 21; the inner end of the second boss 21 is fixedly connected to the first boss 6.

[0007] Furthermore, a descending step structure is formed from the middle of the second boss 21 to both sides and / or a sunken groove 3 is formed between two adjacent second bosses 21. The step structure with high sides and low middle is formed in the sunken groove 3, and a wedge-shaped structure is formed by the step structure.

[0008] Furthermore, the upper portion of the second boss 21 is fixedly connected to the convex strip 22 , one end of the convex strip 22 is fixedly connected to the first boss 6 , and the other end of the convex strip 22 extends toward the outer end of the second boss 21 .

[0009] Furthermore, the circumference where the outer end of the second boss 21 is located protrudes in a direction away from the base body 1 to form a sunken step 5 , and the convex strip 22 extends to the sunken step 5 .

[0010] Furthermore, a slope surface 4 is formed at the bottom of the sinking step 5 toward the side of the base body 1 , and the angle of the slope surface 4 is 0°-55°.

[0011] Compared with the prior art, the utility model forms a convex-concave structure through bosses, and further forms a wedge-shaped structure based on the bosses, which helps to disperse the stress concentration at the bonding point between the diamond particles and the alloy; the bosses are connected to form an integral structure, the integrity is improved, the service life is extended, and the overall product performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a stereoscopic image of a cemented carbide substrate;

[0013] Figure 2 is a top view of the cemented carbide substrate;

[0014] Figure 3 It is the front view of the cemented carbide substrate.

[0015] Among them, the base body 1, the second boss 21, the convex strip 22, the sunken groove 3, the slope surface 4, the sunken step 5, and the first boss 6. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the present utility model, unless otherwise expressly specified and limited, 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 the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0018] As attached Figure 1-3 As shown, a cemented carbide substrate used for polycrystalline diamond composite sheets includes a substrate body 1, a first boss 6 is arranged at one end of the substrate body 1, a plurality of second bosses 21 are arranged on the lateral circumference of the first boss 6, a wedge-shaped structure is formed between two adjacent second bosses 21, and the trend of the wedge-shaped structure is from the middle of each second boss 21 as the highest point to descending between the two second bosses 21; the inner end of the second boss 21 is fixedly connected to the first boss 6.

[0019] The first boss 6 is preferably located in the middle or near the middle of the end face of the base body 1, and is a columnar structure and preferably a cylindrical structure, with a diameter of 0.5~10mm and preferably 3~8mm, and a height of 0.1~5mm and preferably 2~4mm; the second boss 21 is a columnar structure and preferably a columnar structure with a fan-shaped cross-section, the fan-shaped angle is 10°~75°, and the number of the distributed bosses is 2-18 and preferably 6~10.

[0020] Compared with the prior art, the utility model forms a convex-concave structure through bosses, and further forms a wedge-shaped structure based on the bosses, which helps to disperse the stress concentration at the bonding point between the diamond particles and the alloy; the bosses are connected to form an integral structure, the integrity is improved, the service life is extended, and the overall product performance is improved.

[0021] Furthermore, a descending step structure is formed from the middle of the second boss 21 to both sides and / or a sunken groove 3 is formed between two adjacent second bosses 21. The depth of the sunken groove 3 is 0.1~5.0mm and preferably 2~4mm. The step structure with high sides and low middle is formed in the sunken groove 3. The level of the step structure can be determined according to processing conditions and requirements, which helps to further reduce the local stress level. At least one of these two step structures forms a circularly surrounding wedge-shaped structure.

[0022] As a further development of the scheme of "forming a descending stepped structure on both sides in the middle of the second boss", the upper part of the second boss 21 is fixedly connected to the convex strip 22, one end of the convex strip 22 is fixedly connected to the first boss 6, and the other end of the convex strip 22 extends to the outer end of the second boss 21; the shape of the convex strip 22 can be cylindrical, that is, a round rod, a triangle or fan extending outward from the first boss 6, or a long strip as shown in the figure, and the three-level stepped structure shown in the figure is formed by the convex strip 22, the second boss 21, and the sunken groove 3, or the number of levels of the stepped structure can be further increased on this basis.

[0023] Furthermore, the circumference where the outer end of the second boss 21 is located protrudes in a direction away from the base body 1 to form a sunken step 5. The sunken step 5 can be arc-shaped or columnar with edges and corners, and the number of layers can be 1 to 5. The convex strip 22 extends to the sunken step 5, and preferably extends to the bottom of the sunken step 5, so that the integrity above the bottom of the sunken step is further improved, and the convex strip 22 acts as a rib.

[0024] Furthermore, a slope surface 4 is formed at the bottom of the sinking step 5 toward the side of the base body 1 , and the angle of the slope surface 4 is 0° to 55°, preferably 10° to 30°.

[0025] Other benefits include:

[0026] 1. For a diamond composite sheet that bears cutting load, the design of the second boss 21 and the convex strip 22 can improve the stress distribution of the diamond particles in the shear direction, reduce the tangential stress concentration at the diamond / alloy interface, and improve the stability of the composite sheet under cutting conditions.

[0027] 2. The difference in thermal expansion coefficients between diamond and alloy substrate will cause thermal stress during sintering cooling. The concave-convex groove structure can provide additional space, allowing a certain degree of relative displacement, and relieve the stress caused by the mismatch of thermal expansion coefficients.

[0028] 3. The structure of the second boss 21 and the convex strip 22 helps to disperse the stress concentration at the junction of the diamond particles and the alloy. The geometric shape of the convex groove can guide the stress to be distributed along the groove wall and the groove bottom instead of concentrating it on a single plane, thereby reducing the local stress level and reducing the risk of micro cracks or diamond shedding caused by excessive stress.

[0029] 4. The second boss 21 and the convex strip 22 increase the effective bonding area between the alloy substrate and the diamond layer, which helps to improve the mechanical bite and metallurgical bonding effect between the two and enhance the overall stability of the composite sheet.

[0030] 5. The height difference between the second boss 21 and the convex strip 22 further enhances the interface bonding strength and improves stress transfer.

[0031] 6. By effectively designing the depth and width of the convex groove, more cobalt flow and enrichment can be guided in specific areas, thereby forming a stronger bonding interface in these areas, which is especially important for cutting edges subjected to high stress.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A cemented carbide substrate for use in a polycrystalline diamond compact, comprising a substrate body (1), a first boss (6) being arranged at one end of the substrate body (1), and a plurality of second bosses (21) being arranged on the lateral circumference of the first boss (6), characterized in that: A wedge-shaped structure is formed between two adjacent second bosses (21), and the wedge-shaped structure tends to descend from the middle of each second boss (21) as the highest point toward between the two second bosses (21); the inner end of the second boss (21) is fixedly connected to the first boss (6).

2. A cemented carbide substrate for polycrystalline diamond compact according to claim 1, characterized in that: A stepped structure descending from the middle of the second boss (21) to both sides is formed and / or a sunken groove (3) is formed between two adjacent second bosses (21). A stepped structure with high sides and low middle is formed in the sunken groove (3), and a wedge-shaped structure is formed by the stepped structure.

3. A cemented carbide substrate for polycrystalline diamond compact according to claim 2, characterized in that: The upper portion of the second boss (21) is fixedly connected to a convex strip (22), one end of the convex strip (22) is fixedly connected to the first boss (6), and the other end of the convex strip (22) extends toward the outer end of the second boss (21).

4. A cemented carbide substrate for polycrystalline diamond compact according to claim 3, characterized in that: The circumference of the outer end of the second boss (21) protrudes in a direction away from the base body (1) to form a sunken step (5), and the convex strip (22) extends to the sunken step (5).

5. A cemented carbide substrate for polycrystalline diamond compact according to claim 4, characterized in that: The bottom of the sunken step (5) forms a slope surface (4) toward the side of the base body (1), and the angle of the slope surface (4) is 0°-55°.

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