A diamond compact

Abstract

The application relates to a diamond compact, which comprises a tooth sleeve, the cross section of the tooth sleeve is arranged in a circular ring, a blocking disc is coaxially fixed to an opening of one end of the tooth sleeve, a tooth lock body is fixed to the inner side of the blocking disc, a tooth body is provided with a lock groove at one end, a tooth crown is fixed to the other end, the tooth body is installed in the tooth sleeve, the tooth lock body is axially locked with the lock groove, and the tooth body can rotate relative to the tooth lock body. The tooth body can rotate around the tooth sleeve, the position of the tooth crown in contact with the rock is continuously changed, the abrasion of the same position of the tooth crown is reduced, the probability of sudden rupture of the tooth crown is greatly reduced, the cutting edge can be kept sharp for a long time, the service life of the compact is prolonged, and the drilling speed and footage of the PDC drill bit are improved.

Description

Technical Field

[0001] This application relates to the field of drilling tools, specifically to a diamond composite sheet. Background Technology

[0002] Diamond composite sheets are made by sintering diamond micro powder and cemented carbide substrate under ultra-high pressure and high temperature conditions. They have the high hardness, high wear resistance and thermal conductivity of diamond, as well as the strength and impact toughness of cemented carbide. They are ideal materials for manufacturing cutting tools, drilling bits and other wear-resistant tools.

[0003] In related technologies, traditional composite sheets are generally cylindrical and are made of a diamond composite layer with a thickness of 2-3 mm and a cemented carbide matrix through high temperature and high pressure. They are usually fixedly connected to the PDC drill bit body by brazing or other methods.

[0004] When traditional composite sheets cut rocks, only a certain area of ​​the diamond composite layer is in contact with and cuts the rock, causing that area of ​​the diamond composite layer to wear down, thus dulling the diamond composite layer and causing it to lose its cutting function. Summary of the Invention

[0005] This application provides a diamond composite sheet whose tooth body can rotate around the tooth sleeve. The contact area between the tooth crown and the rock is constantly changing, which will reduce wear at the same position of the tooth crown and greatly reduce the probability of sudden fracture of the tooth crown. It can maintain the sharpness of the cutting edge for a long time, extend the service life of the composite sheet, and thus improve the drilling speed and feed of PDC drill bits.

[0006] This application provides a diamond composite sheet, comprising:

[0007] A toothed sleeve, wherein the cross-section of the toothed sleeve is arranged in a circular shape;

[0008] A sealing disc, which is coaxially fixed to one end opening of the toothed sleeve, and a toothed locking body is fixed to the inner side of the sealing disc;

[0009] The tooth body has a locking groove at one end and a tooth crown fixed at the other end. The tooth body is installed in the tooth sleeve. The tooth lock body is axially locked with the locking groove, and the tooth body can rotate relative to the tooth lock body.

[0010] In some embodiments, the locking body includes:

[0011] A cylinder, one end of which is fixed to the inside of the sealing disc;

[0012] A frustum of a cone, one end of which is fixed to the other end of the cylinder;

[0013] Both the cylinder and the truncated cone have through holes on their side walls, and the through holes extend to the truncated cone. The cylinder is inserted into the locking groove, and the truncated cone is axially locked to the locking groove.

[0014] In some embodiments, the lock slot includes:

[0015] A first circular groove and a second circular groove, wherein the axes of the first circular groove and the second circular groove are parallel and the first circular groove and the second circular groove are connected to each other, and the inner diameter of the second circular groove is larger than the inner diameter of the first circular groove.

[0016] The cylinder is inserted into the first circular groove, and the truncated cone is axially locked to the second circular groove.

[0017] In some embodiments, the locking groove has a conical opening at one end near the sealing disc. The conical opening is coaxially arranged with and communicates with the first circular groove. The inner diameter of the conical opening gradually decreases along the interval from the tail end face of the tooth body to the head end face of the tooth body.

[0018] In some embodiments, a third circular groove is provided at one end of the tooth body, and a locking ring is fixed in the third circular groove, so that the inside of the locking ring forms a first circular groove. A second circular groove is provided on the inner bottom wall of the first circular groove, and the inner diameter of the second circular groove is larger than the inner diameter of the first circular groove, so that the first circular groove and the second circular groove form the locking groove.

[0019] The cylinder is inserted into the first circular groove, and the truncated cone is axially locked to the second circular groove.

[0020] In some embodiments, the locking ring has a conical opening at one end near the sealing disc. The conical opening is coaxial with and communicates with the first circular groove. The inner diameter of the conical opening gradually decreases along the interval from the tail end face of the locking ring to the head end face of the locking ring.

[0021] In some embodiments, the through hole includes:

[0022] Hole 1, wherein hole 1 is formed in the side wall of the truncated cone, and one end of hole 1 penetrates the narrow end of the truncated cone;

[0023] Hole 2 is formed on the side wall of the cylinder. Hole 1 and Hole 2 are connected, and the width of Hole 2 is smaller than the width of Hole 1.

[0024] In some embodiments, a through hole is provided on the tail end face of the toothed sleeve, the through hole is coaxially arranged with the toothed sleeve, and the inner diameter of the through hole is larger than the inner diameter of the toothed sleeve.

[0025] The sealing disc is embedded in the through hole and fixed to the toothed sleeve.

[0026] In some embodiments, the head end face of the toothed sleeve is provided with a conical opening three, and the inner diameter of the conical opening three gradually increases along the interval direction from the tail end face of the toothed sleeve to the head end face of the toothed sleeve.

[0027] The outer wall of the tooth body is provided with an integrally formed conical ring, which is adapted to the conical opening in three phases.

[0028] In some embodiments, the tooth sleeve and the tooth body are both made of cemented carbide, the tooth lock body is made of spring steel, and the tooth crown is made of polycrystalline diamond.

[0029] The beneficial effects of the technical solutions provided in this application include:

[0030] During the process of the tooth body extending into the tooth sleeve, the tooth locking body is axially locked with the locking groove of the tooth body, which prevents the tooth body from disengaging from the tooth locking body and thus prevents the tooth body from being pulled out of the tooth sleeve. However, the tooth body can rotate around the tooth locking body (that is, it can rotate inside the tooth sleeve). When the cutting tooth of the PDC drill bit cuts rock, the cylindrical surface of the tooth crown is subjected to the frictional force of the rock along the circumference of the cylindrical surface of the tooth crown. This frictional force can drive the tooth body to rotate around the tooth sleeve. The contact area between the tooth crown and the rock is constantly changing, which will reduce the wear of the same position of the tooth crown and greatly reduce the probability of sudden fracture of the tooth crown. It can maintain the sharpness of the cutting edge for a long time, extend the service life of the composite plate, and thus improve the drilling speed and footage of the PDC drill bit. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the front cross-sectional structure of the first type of diamond composite sheet;

[0033] Figure 2 A three-dimensional structural diagram showing the connection between the sealing disc and the toothed lock body of the first and second types of diamond composite sheets;

[0034] Figure 3 This is a schematic diagram of the front cross-sectional structure of the tooth body of the first type of diamond composite sheet;

[0035] Figure 4 This is a schematic diagram of the front cross-sectional structure of the second type of diamond composite sheet;

[0036] Figure 5 This is a frontal cross-sectional view of the tooth structure of the second type of diamond composite sheet;

[0037] Figure 6 A front view cross-sectional diagram of the locking ring assembly structure for the tooth body of the second type of diamond composite sheet;

[0038] Figure 7 This is a frontal cross-sectional view of the tooth sleeve of the first and second types of diamond composite sheets.

[0039] In the diagram: 1. Gear sleeve; 11. Through hole; 12. Conical opening three; 2. Sealing plate; 3. Gear lock body; 31. Through hole; 311. Hole one; 312. Hole two; 32. Cylinder; 33. Conical frustum; 4. Gear body; 41. Lock groove; 411. First circular groove; 412. Second circular groove; 42. Conical opening one; 43. Third circular groove; 44. Conical ring; 5. Locking ring; 51. Conical opening two; 6. Gear crown. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0041] This application provides a diamond composite sheet whose tooth body can rotate around the tooth sleeve. The contact area between the tooth crown and the rock is constantly changing, which reduces wear at the same position of the tooth crown and greatly reduces the probability of sudden breakage of the tooth crown. It can maintain the sharpness of the cutting edge for a long time, extend the service life of the composite sheet, and thus improve the drilling speed and feed of PDC drill bits.

[0042] like Figure 1 As shown in the embodiment of this application, a diamond composite sheet is provided, which may include: a toothed sleeve 1, the cross-section of the toothed sleeve 1 being annular; a sealing disc 2, the sealing disc 2 being coaxially fixed to one end opening of the toothed sleeve 1, and a toothed locking body 3 being fixed inside the sealing disc 2; and a toothed body 4, one end of the toothed body 4 having a locking groove 41, and the other end of the toothed body 4 having a toothed crown 6 fixed thereon. The toothed body 4 is installed inside the toothed sleeve 1, the toothed locking body 3 is axially locked with the locking groove 41, and the toothed body 4 can rotate relative to the toothed locking body 3.

[0043] During the assembly process where the tooth body extends into the tooth sleeve, the tooth locking body 3 will axially lock with the locking groove 41 of the tooth body 4, preventing the tooth body 4 from disengaging from the tooth locking body 3 and thus preventing the tooth body 4 from being pulled out of the tooth sleeve 1. However, the tooth body 4 can rotate around the tooth locking body 3 (that is, it can rotate inside the tooth sleeve 1). When the PDC drill bit is cutting the tooth, since the tooth body 4 can rotate around the tooth sleeve 1, the contact point between the tooth crown 6 and the rock is constantly changing. Wear at the same position of the tooth crown 6 will be reduced, and the probability of the tooth crown 6 undergoing sudden fracture will be greatly reduced. This can maintain the sharpness of the cutting edge for a long time, extend the service life of the composite piece, and thus improve the drilling speed and footage of the PDC drill bit.

[0044] In one implementation, such as Figure 1 , Figure 2 As shown or as Figure 2 and Figure 4 As shown, the toothed lock body 3 includes: a cylinder 32, one end of which is fixed to the inner side of the sealing disc 2; a truncated cone 33, one end of which is fixed to the other end of the cylinder 32; both the cylinder 32 and the truncated cone 33 have through holes 31 on their side walls, and the through holes 31 extend to the truncated cone 33. The cylinder 32 is inserted into the locking groove 41, and the truncated cone 33 is axially locked to the locking groove 41. Specifically, as shown... Figure 2 As shown, the through hole 31 facilitates the tooth lock body 3 to deform under pressure and insert into the lock groove 41, and to be axially locked with the lock groove 41.

[0045] In one implementation, such as Figure 3 As shown, this is a diamond composite sheet with a first structural form. The locking groove 41 may include a first circular groove 411 and a second circular groove 412. The axes of the first circular groove 411 and the second circular groove 412 are parallel and interconnected. The inner diameter of the second circular groove 412 is larger than the inner diameter of the first circular groove 411. A cylinder 32 is inserted into the first circular groove 411, and a frustum 33 is axially locked to the second circular groove 412. During the insertion of the frustum 33 into the first circular groove 411, the frustum 33 undergoes a certain amount of compression deformation until it moves into the second circular groove 412 and returns to its original shape. Meanwhile, the cylinder 32 is located in the first circular groove 411. At this time, the toothed locking body 3 and the locking groove 41 are axially locked, preventing axial movement but allowing rotation around the axis.

[0046] Furthermore, such as Figure 1 and Figure 3As shown, the locking groove 41 has a conical opening 42 at one end near the sealing disc 2. The inner diameter of the conical opening 42 gradually decreases along the interval from the tail end face of the tooth body 4 to the head end face of the tooth body 4. The end face of the tooth body 4 that is inserted into the tooth sleeve 1 is the tail end face, and the end face that is exposed outside the tooth sleeve 1 is the head end face. The design of the conical opening 42 facilitates the smooth insertion of the tooth lock body 3 into the locking groove 41.

[0047] In one implementation, such as Figure 4 , Figure 5 and Figure 6 As shown, this is a diamond composite sheet with a second structural form. One end of the tooth body 4 has a third circular groove 43. A locking ring 5 is fixed inside the third circular groove 43, forming a first circular groove 411 inside the locking ring 5. A second circular groove 412 is formed on the inner bottom wall of the first circular groove 411, and the inner diameter of the second circular groove 412 is larger than the inner diameter of the first circular groove 411, thus forming a locking groove 41 between the first and second circular grooves 411. A cylinder 32 is inserted into the first circular groove 411, and a truncated cone 33 is axially locked to the second circular groove 412. In this second structural form of the diamond composite sheet, the structure of the tooth locking body 3 remains unchanged. Through the cooperation of the third circular groove 43 and the locking ring 5, the T-shaped locking groove 41 (i.e., the first circular groove 411 and the second circular groove 412) found in the first structural form of the diamond composite sheet can be formed. The locking ring 5 can be first assembled with the tooth lock body 3 with a clearance fit, and then the locking ring 5 can be brazed and fixed to the third circular groove 43 of the tooth body 4. Alternatively, the locking ring 5 can be assembled with the tooth body 4 with an interference fit to form a fixed connecting piece of the tooth body 4-locking ring 5, which facilitates the assembly of the fixed connecting piece of the tooth body 4-locking ring 5 with the tooth sleeve 1 and the tooth lock body 3.

[0048] Furthermore, such as Figure 6 As shown, the tail end face of the locking ring 5 has a conical opening 51. Along the interval from the tail end face to the head end face of the locking ring 5, the inner diameter of the conical opening 51 gradually decreases. The end face of the locking ring 5 furthest from the third circular groove 43 is the tail end face, and the end face into the third circular groove 43 is the head end face. The gradually decreasing inner diameter of the conical opening 51 facilitates the smooth insertion of the toothed lock body 3 into the first circular groove 411 formed inside the locking ring 5, improving assembly efficiency and convenience.

[0049] In one implementation, such as Figure 7As shown, a through hole 11 is provided on the tail end face of the tooth sleeve 1. The through hole 11 is coaxially arranged with the tooth sleeve 1, and the inner diameter of the through hole 11 is larger than the inner diameter of the tooth sleeve 1. The sealing disc 2 is embedded in the through hole 11 and fixed to the tooth sleeve 1. The end face of the tooth sleeve 11 away from the tooth crown 6 is the tail end face, and the end face close to the tooth crown 6 is the head end face. In the diamond composite sheet of the first or second structural form, the sealing disc 2 and the tooth sleeve 1 can be installed by interference fit or by clearance fit plus brazing.

[0050] In one implementation, such as Figure 7 As shown, the head end face of the tooth sleeve 1 has a conical opening 312. Along the interval from the tail end face to the head end face of the tooth sleeve 1, the inner diameter of the conical opening 312 gradually increases. An integrally formed conical ring 44 is provided on the outer wall between the head and tail end faces of the tooth body 4, and the conical ring 44 is adapted to the conical opening 312. In either the first or second structural form of the diamond composite sheet, the conical opening 312 facilitates the insertion of the tooth body 4 into the interior of the tooth sleeve 1, facilitating subsequent positioning and connection with the tooth lock body 3. The conical ring 44 can contact the conical opening 312 of the tooth sleeve 1, increasing the load-bearing capacity of the diamond composite sheet.

[0051] In one embodiment, within the diamond composite sheet of the first or second structural form, the material of the tooth lock body 3 may include spring steel, and the material of the tooth crown 6 may include polycrystalline diamond.

[0052] In one embodiment, in the diamond composite sheet of either the first or second structural form, the materials of the sleeve 1 and the tooth body 4 can both include cemented carbide.

[0053] In one implementation, such as Figure 1 As shown, the tooth body 4 can be a stepped cylinder with a large outer diameter at the right end and a small outer diameter at the left end. The tail end face of the tooth body 4 (that is, the left end of the tooth body 4) is provided with a locking groove, and the head end face (that is, the right end of the tooth body 4) is fixed with a tooth crown 6.

[0054] In the above embodiments, in the diamond composite sheet of the first structural form, the difference between the diameter of one end of the wide frustum 33 and the diameter of the first circular groove 411 can be in the range of 0.1mm to 3.0mm; the difference between the diameter of one end of the wide frustum 33 and the diameter of the second circular groove 412 can be in the range of -0.1mm to -2.0mm.

[0055] In the above embodiments, the first circular groove 411, the second circular groove 412 and the third circular groove 43 can be cylindrical grooves or conical grooves.

[0056] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0057] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A diamond composite sheet, characterized in that, It includes: A toothed sleeve (1) has a circular cross-section; The sealing disc (2) is coaxially fixed to one end opening of the toothed sleeve (1), and a toothed lock body (3) is fixed on the inner side of the sealing disc (2). The tooth body (4) has a locking groove (41) at one end and a tooth crown (6) fixed at the other end. The tooth body (4) is installed in the tooth sleeve (1). The tooth lock body (3) is axially locked with the locking groove (41), and the tooth body (4) can rotate relative to the tooth lock body (3). The tooth lock body (3) includes: A cylinder (32), one end of which is fixed to the inner side of the sealing disc (2); A frustum of a cone (33), one end of which is fixed to the other end of the cylinder (32); Both the cylinder (32) and the truncated cone (33) have through holes (31) on their side walls, and the through holes (31) extend to the truncated cone (33). The cylinder (32) is inserted into the locking groove (41), and the truncated cone (33) is axially locked to the locking groove (41). A third circular groove (43) is provided at one end of the tooth body (4), and a locking ring (5) is fixed in the third circular groove (43), so that the inside of the locking ring (5) forms a first circular groove (411). A second circular groove (412) is provided on the inner bottom wall of the first circular groove (411), and the inner diameter of the second circular groove (412) is greater than the inner diameter of the first circular groove (411), so that the first circular groove (411) and the second circular groove (412) form the locking groove (41). The outer diameter of the large outer diameter end of the tooth lock body cone (33) is greater than the inner diameter of the first circular groove (411) and smaller than the inner diameter of the second circular groove (412). The cylinder (32) is inserted into the first circular groove (411), and the truncated cone (33) is axially locked to the second circular groove (412); The locking ring (5) has a conical opening (51) at one end near the sealing disc (2). The conical opening (51) is coaxially arranged with the first circular groove (411) and is interconnected. The inner diameter of the conical opening (51) gradually decreases along the interval from the tail end face of the locking ring (5) to the head end face of the locking ring (5).

2. The diamond composite sheet as described in claim 1, characterized in that, The lock slot (41) includes: A first circular groove (411) and a second circular groove (412), wherein the first circular groove (411) and the second circular groove (412) are parallel to each other and are connected to each other, and the inner diameter of the second circular groove (412) is larger than the inner diameter of the first circular groove (411). The cylinder (32) is inserted into the first circular groove (411), and the truncated cone (33) is axially locked to the second circular groove (412).

3. The diamond composite sheet as described in claim 1, characterized in that, The through hole (31) includes: Hole 1 (311), said hole 1 (311) is opened on the side wall of said cone (33), and one end of said hole 1 (311) passes through the narrow end of said cone (33); Hole 2 (312) is formed on the side wall of the cylinder (32). Hole 1 (311) is connected to Hole 2 (312), and the width of Hole 2 (312) is smaller than the width of Hole 1 (311).

4. The diamond composite sheet as described in claim 1, characterized in that, The tail end face of the toothed sleeve (1) is provided with a through hole (11), the through hole (11) is coaxially arranged with the toothed sleeve (1), and the inner diameter of the through hole (11) is larger than the inner diameter of the toothed sleeve (1). The sealing disc (2) is embedded in the through hole (11) and fixed to the toothed sleeve (1).

5. The diamond composite sheet as described in claim 1, characterized in that, The head end face of the toothed sleeve (1) is provided with a conical opening three (12), and the inner diameter of the conical opening three (12) gradually increases along the interval direction from the tail end face of the toothed sleeve (1) to the head end face of the toothed sleeve (1). The outer wall of the tooth body (4) is provided with an integrally formed conical ring (44), which is adapted to the conical mouth (12).

6. The diamond composite sheet as described in claim 1, characterized in that, The tooth sleeve (1) and the tooth body (4) are both made of cemented carbide, the tooth lock body (3) is made of spring steel, and the tooth crown (6) is made of polycrystalline diamond.

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