Polycrystalline diamond hard alloy composite sheet with rotary structure

Abstract

The utility model provides a polycrystalline diamond hard alloy compact of a rotating structure, and relates to the technical field of superhard composites.The polycrystalline diamond hard alloy compact of the rotating structure comprises a diamond compact body, and the diamond compact body comprises a polycrystalline diamond layer and a hard alloy layer; and the hard alloy lantern ring is rotationally arranged on the outer side of the hard alloy layer in a sleeving mode, the hard alloy lantern ring comprises at least two split blocks, and the split blocks are annularly arranged and spliced. Therefore, an elastic check ring is not needed for connection, the defect that the elastic check ring cannot bear high-load and high-strength working occasions is overcome, the connection strength of the hard alloy lantern ring and the hard alloy layer is effectively improved, meanwhile, an annular groove used for installing the elastic check ring does not need to be formed in the hard alloy lantern ring and the hard alloy layer, and the stress concentration phenomenon is avoided. And the structural strength and the service life are effectively improved. By adjusting the structure of the diamond compact, efficient cutting of the rotary cutting edge of the compact and long service life of the compact are realized.

Description

Technical Field

[0001] The present application relates to the technical field of superhard composite materials, and in particular to a rotating structure polycrystalline diamond carbide composite sheet. Background Art

[0002] Polycrystalline Diamond Compacts (PDC, "Compacts") have both the high hardness and high wear resistance of diamond and the high strength, impact toughness and good weldability of cemented carbide. They are widely used in the fields of oil and gas drilling, geological drilling, engineering tunneling, coal mining, etc., and have become the main cutting parts of drilling and tunneling equipment.

[0003] In the prior art, the composite piece is fixed to the drill bit body by high-temperature brazing. During the entire life cycle of the PDC drill bit, the composite piece cuts the rock formation at a fixed angle, and only a single cutting edge plays a cutting role, and the rest of the large area cannot directly participate in cutting and drilling. During operation, the contact area between the composite piece and the rock will increase rapidly as the cutting edge becomes larger, resulting in a sharp increase in surface friction, heat accumulation on the cutting edge, and more prone to crack propagation and diamond layer peeling, which will lead to the overall failure of the composite piece and seriously reduce the service life of the drill bit. At the same time, increased wear on the cutting edge will cause the cutting edge to become blunt, and the cutting edge penetration will decrease rapidly, resulting in a significant reduction in cutting efficiency.

[0004] In response to the above problems, extensive research has been conducted at home and abroad. At present, the focus is mainly on improving the overall wear resistance of the composite sheet to extend the working life of the cutting edge, or improving the three-dimensional structure of the cutting edge of the composite sheet, thereby enhancing the ability of the composite sheet to eat into the rock formation and improve the rock breaking efficiency. These studies and solutions mainly focus on the local performance enhancement of the cutting edge of the composite sheet, which has improved the cutting efficiency and working life of the composite sheet to a certain extent, but has not completely solved the problem of the overall performance of the composite sheet.

[0005] In order to solve the above technical problems, the utility model with announcement number CN212689932U discloses a rotatable diamond composite sheet, which consists of two parts: a polycrystalline diamond layer and a cemented carbide component. The cemented carbide component includes a cemented carbide substrate sintered with the polycrystalline diamond layer under high temperature and high pressure. The cemented carbide substrate is rotatably arranged in a cemented carbide cup. By changing the structure of the diamond composite sheet, the traditional single-edge cutting is changed to 360° rotational cutting, which improves the wear resistance of the product, enables the cutting edge to always maintain a high-efficiency sharp state, and increases the service life of the drill bit.

[0006] The carbide substrate and carbide cup of the rotatable diamond composite sheet are connected in the following manner: the lower part of the carbide substrate is inserted into the hollow interior of the carbide cup, and annular grooves are respectively provided on the carbide substrate and the carbide cup, and the carbide substrate and the carbide cup are connected by clamping the elastic retaining ring in the annular groove for axial limitation. However, since the diamond composite sheet needs to withstand extremely high loads during operation, the elastic retaining ring is subjected to greater pressure and is prone to fatigue deformation, so the connection strength between the carbide substrate and the carbide cup is relatively low. In addition, when installing the elastic retaining ring, an annular groove for accommodating the elastic retaining ring needs to be opened on the carbide substrate and the carbide cup, and after grooving, stress concentration will occur in the grooved area where the cross-section suddenly changes, causing defects such as cracking, notches and fractures, reducing the structural strength and service life of the carbide substrate and the carbide cup. Utility Model Content

[0007] The purpose of the present application is to provide a rotating structure polycrystalline diamond carbide composite sheet, which is used to solve the problem that the rotating diamond composite sheet in the related art is connected by an elastic retaining ring, resulting in low connection strength and structural strength, as well as short service life.

[0008] The present application provides a rotating structure polycrystalline diamond carbide composite sheet adopts the following technical solution:

[0009] A rotating structure polycrystalline diamond carbide composite sheet, comprising:

[0010] A diamond composite sheet body, the diamond composite sheet body comprising a polycrystalline diamond layer and a cemented carbide layer, the polycrystalline diamond layer being fixedly connected to the cemented carbide layer;

[0011] A cemented carbide sleeve is rotatably sleeved on the outside of the cemented carbide layer. The cemented carbide sleeve comprises at least two split blocks, which are arranged and spliced ​​in a ring shape, and adjacent split blocks are fixedly connected.

[0012] Optionally, the adjacent split blocks are fixedly connected by brazing, and welds for brazing are provided at the connection between the adjacent split blocks.

[0013] Optionally, the side surfaces of adjacent split blocks abut against each other, a slope is provided on the side surface of one of the split blocks, and the weld is formed between the slope and the side surface of another split block.

[0014] Optionally, the cemented carbide layer is divided into a front section, a middle section and a rear section in order of distance from the polycrystalline diamond layer from near to far, and the front section is cylindrical, the middle section and the rear section are truncated cones with narrow ends connected, and the cemented carbide ring is rotatably sleeved on the outside of the middle section and the rear section of the cemented carbide layer.

[0015] Optionally, the bevel angle of the frustoconical middle section of the cemented carbide layer is 0° to 75°, and the bevel angle of the frustoconical rear section of the cemented carbide layer is 45° to 89.5°;

[0016] There is a clearance fit between the inner circumference of the cemented carbide sleeve and the outer circumference of the cemented carbide layer, and the size of the clearance fit is 0.005 mm to 0.5 mm.

[0017] Optionally, a female positioning portion is provided on a side of the split block, and a male positioning portion matching with the female positioning portion is provided on a side of an adjacent split block.

[0018] Optionally, the female positioning portion is a positioning groove provided on the side of the split block, and the male positioning portion is a positioning boss provided on the side of the split block, and the positioning boss is engaged with the positioning groove.

[0019] Optionally, the cemented carbide layer is divided into a first section and a second section in order of distance from the polycrystalline diamond layer from near to far, and the first section is cylindrical in shape and the second section is truncated cone in shape, and the cemented carbide ring is rotatably sleeved on the outside of the second section of the cemented carbide layer.

[0020] Optionally, the outer periphery of the cemented carbide layer is provided with an inwardly concave arc surface, and the inner periphery of the cemented carbide ring is matched with the arc surface of the outer periphery of the cemented carbide layer.

[0021] Optionally, an end surface of the split block away from the cemented carbide layer is provided with an end plate, and the side portions of adjacent end plates are spliced ​​to each other.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: when the carbide ring is connected to the carbide layer, the multiple split blocks are first spliced ​​and sleeved on the outside of the carbide layer, and then the multiple split blocks are fixedly connected to achieve the rotational connection between the carbide ring and the carbide layer. There is no need to use an elastic retaining ring for connection, avoiding the disadvantage that the elastic retaining ring cannot withstand high loads and high-intensity working environments, effectively improving the connection strength between the carbide ring and the carbide layer, and at the same time, there is no need to open a ring groove for installing the elastic retaining ring on the carbide ring and the carbide layer, avoiding stress concentration, and effectively improving the structural strength and service life of the rotating structure polycrystalline diamond carbide composite sheet of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the rotating structure polycrystalline diamond carbide composite sheet in Example 1 of the present application;

[0024] Figure 2 It is a cross-sectional view of the rotating structure polycrystalline diamond carbide composite sheet in Example 1 of the present application;

[0025] Figure 3 This is a schematic diagram of the decomposition of the rotating structure polycrystalline diamond carbide composite sheet in Example 1 of the present application;

[0026] Figure 4 This is a schematic diagram of the structure of the cemented carbide sleeve in Example 1 of the present application;

[0027] Figure 5 A cross-sectional view of a rotating structure polycrystalline diamond carbide composite sheet in Example 2 of the present application;

[0028] Figure 6 This is a schematic diagram of the decomposition of the rotating structure polycrystalline diamond carbide composite sheet in Example 2 of the present application;

[0029] Figure 7 A cross-sectional view of a rotating structure polycrystalline diamond carbide composite sheet in Example 3 of the present application;

[0030] Figure 8 This is a schematic diagram of the decomposition of the rotating structure polycrystalline diamond carbide composite sheet in Example 3 of the present application;

[0031] Fig. 9 This is a cross-sectional view of the rotating structure polycrystalline diamond carbide composite sheet in Example 4 of the present application.

[0032] Description of reference numerals:

[0033] 10. polycrystalline diamond layer; 11. first chamfer;

[0034] 20. Cemented carbide layer; 21. front section; 22. middle section; 23. rear section; 24. first section; 25. second section; 26. cambered surface; 27. second chamfer;

[0035] 30. Carbide sleeve ring; 31. Split block; 311. Inclined surface; 312. Positioning groove; 313. Positioning boss; 32. Welding seam; 33. Third chamfer; 34. End plate. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 To Attachment Fig. 9 , further details of this application are given.

[0037] Example 1

[0038] This embodiment discloses a rotating structure polycrystalline diamond carbide composite sheet.

[0039] Reference Figures 1 to 4A rotating structure polycrystalline diamond carbide composite sheet includes a diamond composite sheet body and a carbide ring 30. The diamond composite sheet body includes a polycrystalline diamond layer 10 and a carbide layer 20. The polycrystalline diamond layer 10 is fixedly connected to the carbide layer 20. The polycrystalline diamond layer 10 and the carbide layer 20 are sintered together at high temperature and high pressure. The end of the polycrystalline diamond layer 10 away from the carbide layer 20 is provided with a first chamfer 11, and the end of the carbide layer 20 away from the polycrystalline diamond layer 10 is provided with a second chamfer 27.

[0040] The cemented carbide ring 30 is rotatably mounted on the outside of the cemented carbide layer 20 around an axis, and a third chamfer 33 is provided at one end of the cemented carbide ring 30 away from the polycrystalline diamond layer 10. There is a clearance fit between the inner circumference of the cemented carbide ring 30 and the outer circumference of the cemented carbide layer 20, and the clearance size is 0.005 mm to 0.5 mm, preferably 0.1 mm.

[0041] The cemented carbide layer 20 is divided into a front section 21, a middle section 22 and a rear section 23 in order of distance from the polycrystalline diamond layer 10 from near to far, and the front section 21 is cylindrical, and the middle section 22 and the rear section 23 are truncated cones with narrow ends connected. The cemented carbide ring 30 is rotatably sleeved on the outside of the middle section 22 and the rear section 23 of the cemented carbide layer 20, and the inner circumferential wall of the cemented carbide ring 30 is matched with the outer circumferential wall of the middle section 22 and the rear section 23 of the cemented carbide layer 20, thereby axially limiting the cemented carbide ring 30 and the cemented carbide layer 20 to prevent the cemented carbide ring 30 from separating from the cemented carbide layer 20.

[0042] The bevel angle β of the frustoconical middle section 22 of the cemented carbide layer 20 is 0° to 75°, preferably 45°; the bevel angle α of the frustoconical rear section 23 of the cemented carbide layer 20 is 45° to 89.5°, preferably 85°.

[0043] The cemented carbide collar 30 includes at least two split blocks 31, preferably two split blocks 31, which are arranged and spliced ​​in a ring shape, and adjacent split blocks 31 are spliced ​​and positioned by the following structure:

[0044] The side of the split block 31 is provided with a female positioning part, and the side of the adjacent split block 31 is provided with a male positioning part that matches the female positioning part. More specifically, the female positioning part can be a positioning groove 312 provided on the side of the split block 31, and the male positioning part can be a positioning boss 313 provided on the side of the split block 31, and the positioning boss 313 is engaged with the positioning groove 312.

[0045] The adjacent split blocks 31 are fixedly connected, and the adjacent split blocks 31 can be fixedly connected by brazing, and preferably by high-temperature welding with a copper-based brazing material, and a weld 32 for brazing is provided at the connection between the adjacent split blocks 31. In this embodiment, the weld 32 can adopt the following structure: the side surfaces of the adjacent split blocks 31 abut against each other, and a slope 311 is provided on the side surface of one of the split blocks 31, and the weld 32 is formed between the slope 311 and the side surface of another split block 31.

[0046] When adjacent split blocks 31 are spliced, they may not be positioned by the positioning bosses 313 and the positioning grooves 312 , but the adjacent split blocks 31 may be directly fitted together by their side surfaces.

[0047] The implementation principle of the rotating structure polycrystalline diamond carbide composite sheet of the present embodiment is as follows: when the carbide collar 30 is connected to the carbide layer 20, the two split blocks 31 are first spliced ​​and sleeved on the outside of the middle section 22 and the rear section 23 of the carbide layer 20, and then the two split blocks 31 are fixedly connected by brazing to realize the rotation connection between the carbide collar 30 and the carbide layer 20. Therefore, there is no need to use an elastic retaining ring for connection, avoiding the disadvantage that the elastic retaining ring cannot withstand high load and high strength working conditions, effectively improving the connection strength between the carbide collar 30 and the carbide layer 20, and at the same time, there is no need to open a ring groove for installing the elastic retaining ring on the carbide collar 30 and the carbide layer 20, avoiding stress concentration phenomenon, and effectively improving the structural strength and service life of the rotating structure polycrystalline diamond carbide composite sheet of the present application.

[0048] Example 2

[0049] This embodiment discloses a rotating structure polycrystalline diamond carbide composite sheet.

[0050] Reference Figure 5 and Figure 6 The difference between the rotating structure polycrystalline diamond carbide composite sheet of this embodiment and that of embodiment 1 is that the carbide layer 20 is divided into a first section 24 and a second section 25 in order of distance from the polycrystalline diamond layer 10 from near to far, and the shape of the first section 24 is cylindrical, and the shape of the second section 25 is truncated cone, the truncated cone narrow end of the second section 25 is connected to the end face of the cylindrical first section 24, and the carbide ring 30 is rotatably sleeved on the outer side of the second section 25 of the carbide layer 20, and one end face of the carbide ring 30 is in contact with the end face of the cylindrical first section 24.

[0051] The implementation principle of a rotating structure polycrystalline diamond carbide composite sheet in the present embodiment is: the shape of the first section 24 of the carbide layer 20 is set to be cylindrical, and the shape of the second section 25 is set to be truncated cone, so that when the rotating structure polycrystalline diamond carbide composite sheet of the present application is working, when the polycrystalline diamond layer 10 is subjected to axial pressure, since the end face of the carbide ring 30 is in contact with the end face of the cylindrical first section 24, the force transmitted to the carbide ring 30 through the carbide layer 20 is also toward the axial direction of the carbide ring 30, thereby reducing the radial distribution force on the multiple split blocks 31 and improving the structural strength of the carbide ring 30.

[0052] Example 3

[0053] This embodiment discloses a rotating structure polycrystalline diamond carbide composite sheet.

[0054] Reference Figure 7 and Figure 8 The difference between the rotating structure polycrystalline diamond carbide composite sheet of this embodiment and the embodiment 1 is that the outer periphery of the carbide layer 20 is provided with an inwardly concave arc surface 26, and the inner periphery of the carbide ring 30 is matched with the arc surface 26 of the outer periphery of the carbide layer 20.

[0055] The implementation principle of a rotating structure polycrystalline diamond carbide composite sheet in this embodiment is: the outer periphery of the carbide layer 20 is set to an inwardly concave arc surface 26, and the inner periphery of the carbide ring 30 is matched with the arc surface 26 of the outer periphery of the carbide layer 20, so that the outer periphery of the carbide layer 20 and the inner periphery of the carbide ring 30 have a smooth transition, reducing the location of stress concentration, and improving the structural strength and service life of the rotating structure polycrystalline diamond carbide composite sheet of this application.

[0056] Example 4

[0057] This embodiment discloses a rotating structure polycrystalline diamond carbide composite sheet.

[0058] Reference Fig. 9The difference between the rotating structure polycrystalline diamond carbide composite sheet of this embodiment and that of embodiment 1 is that an end face of the split block 31 away from the carbide layer 20 is provided with an end plate 34, and the sides of adjacent end plates 34 are spliced ​​with each other. When the rotating structure polycrystalline diamond carbide composite sheet of the present application is fixed on the drill bit or the pick body as a whole, it is achieved by high-temperature brazing of a carbide sleeve ring, preferably high-temperature welding with a silver-based brazing material. Since the split block 31 in embodiments 1 to 3 of the present application is not provided with an end plate 34, when the rotating structure polycrystalline diamond carbide composite sheet is fixed on the drill bit or the pick body as a whole, in order to avoid contact between the carbide layer 20 and the solder and affect the rotation of the carbide layer 20, brazing can only be performed on the outer peripheral surface of the carbide sleeve ring 30, resulting in a low connection strength between the rotating structure polycrystalline diamond carbide composite sheet and the drill bit or the pick body. Since the split block 31 of this embodiment is provided with an end plate 34, the solder can be prevented from contacting the cemented carbide layer 20. Therefore, when the rotating structure polycrystalline diamond cemented carbide composite sheet is brazed with a drill bit or a pick body, brazing can be performed on the outer peripheral surface and end surface of the cemented carbide ring 30, thereby improving the connection strength.

[0059] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotating structure polycrystalline diamond carbide composite sheet, characterized in that: include: A diamond composite sheet body, the diamond composite sheet body comprising a polycrystalline diamond layer (10) and a cemented carbide layer (20), the polycrystalline diamond layer (10) being fixedly connected to the cemented carbide layer (20); A hard alloy sleeve (30) is rotatably sleeved on the outside of the hard alloy layer (20), and the hard alloy sleeve (30) comprises at least two split blocks (31), the split blocks (31) are arranged and spliced ​​in a ring shape, and adjacent split blocks (31) are fixedly connected.

2. The rotating structure polycrystalline diamond carbide composite sheet according to claim 1, characterized in that: The adjacent split blocks (31) are fixedly connected by brazing, and the connection between the adjacent split blocks (31) is provided with a weld (32) for brazing.

3. The rotating structure polycrystalline diamond carbide composite sheet according to claim 2, characterized in that: The side surfaces of adjacent split blocks (31) abut against each other, a slope (311) is provided on the side surface of one of the split blocks (31), and the welding seam (32) is formed between the slope (311) and the side surface of another split block (31).

4. The rotating structure polycrystalline diamond carbide composite sheet according to claim 1, characterized in that: The hard alloy layer (20) is divided into a front section (21), a middle section (22) and a rear section (23) in order of distance from the polycrystalline diamond layer (10) from near to far, and the front section (21) is cylindrical in shape, and the middle section (22) and the rear section (23) are truncated cones with narrow ends connected, and the hard alloy sleeve (30) is rotatably sleeved on the outer sides of the middle section (22) and the rear section (23) of the hard alloy layer (20).

5. The rotating structure polycrystalline diamond carbide composite sheet according to claim 4, characterized in that: The oblique angle of the frustoconical middle section (22) of the cemented carbide layer (20) is 0° to 75°, and the oblique angle of the frustoconical rear section (23) of the cemented carbide layer (20) is 45° to 89.5°; There is a clearance fit between the inner circumference of the hard alloy sleeve ring (30) and the outer circumference of the hard alloy layer (20), and the clearance size is 0.005 mm to 0.5 mm.

6. The rotating structure polycrystalline diamond carbide composite sheet according to claim 1, characterized in that: The side of the split block (31) is provided with a female positioning portion, and the side adjacent to the split block (31) is provided with a male positioning portion that matches the female positioning portion.

7. The rotating structure polycrystalline diamond carbide composite sheet according to claim 6, characterized in that: The female positioning portion is a positioning groove (312) provided on the side of the split block (31), and the male positioning portion is a positioning boss (313) provided on the side of the split block (31), and the positioning boss (313) is snap-fitted with the positioning groove (312).

8. The rotating structure polycrystalline diamond carbide composite sheet according to claim 1, characterized in that: The cemented carbide layer (20) is divided into a first section (24) and a second section (25) in order of distance from the polycrystalline diamond layer (10) from near to far, and the first section (24) is cylindrical in shape, and the second section (25) is truncated cone in shape, and the cemented carbide ring (30) is rotatably sleeved on the outer side of the second section (25) of the cemented carbide layer (20).

9. The rotating structure polycrystalline diamond carbide composite sheet according to claim 1, characterized in that: The outer periphery of the hard alloy layer (20) is provided with an inwardly concave arc surface (26), and the inner periphery of the hard alloy sleeve (30) is matched with the arc surface (26) of the outer periphery of the hard alloy layer (20).

10. The rotating structure polycrystalline diamond carbide composite sheet according to claim 1, characterized in that: An end surface of the split block (31) away from the hard alloy layer (20) is provided with an end plate (34), and the side portions of adjacent end plates (34) are spliced ​​with each other.

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