CN212130404U - Rotatable polycrystalline diamond composite tooth and drill bit thereof - Google Patents
Rotatable polycrystalline diamond composite tooth and drill bit thereof Download PDFInfo
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- CN212130404U CN212130404U CN202020182104.XU CN202020182104U CN212130404U CN 212130404 U CN212130404 U CN 212130404U CN 202020182104 U CN202020182104 U CN 202020182104U CN 212130404 U CN212130404 U CN 212130404U
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Abstract
The utility model discloses a rotatable polycrystalline diamond composite tooth and a drill bit thereof, which can realize the radial flexible rotation and the limited rotation in the axial direction of the polycrystalline diamond composite tooth in a mounting hole by arranging a cambered surface concave hole at the bottom of the polycrystalline diamond composite tooth, connecting the bottom of the polycrystalline diamond composite tooth with a drill bit body through a metal ball and fixing the bottom of the polycrystalline diamond composite tooth through a baffle plate in front of the polycrystalline diamond composite tooth; the flexibility of radial rotation enables the edge of the top surface of the polycrystalline diamond layer of the whole polycrystalline diamond composite tooth to participate in cutting work so as to improve the utilization rate of the whole polycrystalline diamond composite tooth, so that the rapid drilling of the polycrystalline diamond composite drill bit can be kept to the maximum extent, and the premature failure of the polycrystalline diamond composite tooth can be avoided; the limited rotation in the axial direction can effectively buffer the impact of external force on the polycrystalline diamond compact, greatly improve the impact resistance of the polycrystalline composite tooth and prolong the service life of the polycrystalline composite tooth.
Description
Technical Field
The utility model relates to a polycrystalline diamond composite drill bit technical field, concretely relates to rotatable formula polycrystalline diamond composite tooth and drill bit thereof.
Background
The polycrystalline diamond composite drill bit is widely applied to the fields of petroleum, coal, various mineral exploitation, geological exploration and the like due to high wear resistance and high impact resistance. Along with the development and progress of the society, people have more and more demands on various petroleum, coal and mineral resources, and the market competition makes enterprises put forward higher requirements on the resource exploitation and drilling cost, and the requirements on the service life and the drilling speed of the polycrystalline diamond composite drill bit are higher and higher.
At present, polycrystalline diamond composite drill bits used for petroleum, coal and various mineral mining and geological exploration mainly comprise a drill bit body and a plurality of disc-shaped polycrystalline diamond composite teeth, and each polycrystalline diamond composite tooth is fixed on the drill bit body in a welding mode. In order to improve the cutting force of the drill bit at different angles, the polycrystalline diamond composite teeth are obliquely fixed on the drill bit body, namely a certain included angle exists between the central axis of the polycrystalline diamond composite teeth and the central axis of the drill bit body. However, the polycrystalline diamond compact bit is installed in an inclined manner, so that when the polycrystalline diamond compact bit drills, the cutting drilling work is performed on the rock by using only the part (namely, the working edge part) of the semicircular arc-shaped edge on the outwards protruding side of the polycrystalline diamond layer at the top of the polycrystalline diamond compact, and the rest semicircular part (namely, the non-working edge part) of the polycrystalline diamond layer at the top of the polycrystalline diamond compact bit does not substantially participate in the cutting of the rock. At the beginning, the working edge part of the polycrystalline diamond composite tooth is relatively sharp, and the drilling speed is very high. However, as the drilling time increases, the working edge portion becomes increasingly dull due to the continuous wear of the rock, so that the drilling speed of the polycrystalline diamond composite tooth decreases in a parabolic manner, and the polycrystalline diamond composite tooth fails prematurely. However, the non-working edge portion of the polycrystalline diamond compact is not substantially worn, which results in a very low utilization of the entire polycrystalline diamond compact. In addition, because the polycrystalline diamond layer of the polycrystalline diamond composite tooth is formed by sintering diamond micro powder in a high-temperature and high-pressure environment under the catalytic action of metal cobalt, the polycrystalline diamond layer contains a metal cobalt component, and the thermal expansion coefficient of the metal cobalt is about 10 times that of diamond. Therefore, in the process that the polycrystalline diamond composite tooth is fixed on the drill bit in a welding mode, due to the fact that the thermal expansion coefficients of cobalt and diamond are different, large thermal stress can be generated on the diamond layer, microcracks can be generated inside the polycrystalline diamond layer under the condition that the stress is too large, and the shock resistance of the polycrystalline diamond composite tooth is reduced. In severe cases, it may even lead to the entire polycrystalline diamond layer falling off.
In order to solve the problems, manufacturers at home and abroad design rotatable polycrystalline diamond composite tooth structures by fully utilizing the edge sharpness of the whole circumference of a polycrystalline diamond layer of the polycrystalline diamond composite tooth. For example, the chinese utility model patent with the publication number CN203729882U, "a cutting tooth self-rotating type drill bit", its self-rotating type cutting tooth (i.e., polycrystalline diamond composite tooth) is composed of a cutting head, a rotary tooth sleeve and a rotating device, wherein the cutting head is T-shaped, the rotary tooth sleeve is U-shaped, the cutting head is embedded into the rotary tooth sleeve, and the connection is realized through the rotating device. The rotary gear sleeve of the self-rotating cutting tooth is welded and fixed on the drill body. Although the self-rotating cutting tooth with the structure can rotate on the bit body in the radial direction when cutting rocks, the whole edge of the polycrystalline diamond layer can participate in the cutting work, and the whole circle of edge of the polycrystalline diamond layer can be fully utilized. However, because the cutting head and the rotary gear sleeve adopt a nested structure, the axial play phenomenon between the cutting head and the rotary gear sleeve inevitably occurs under the action of external impact force. When the external impact force is too large, the axial play phenomenon is increased, which not only easily causes the hard alloy part of the cutting head to crack, but also easily causes the problem of the rotating device (such as difficult recovery of spring deformation), the integral impact resistance of the self-rotating cutting tooth is poor, and the service life of the self-rotating cutting tooth needs to be prolonged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve is that the whole shock resistance of current rotatable polycrystalline diamond composite tooth is not good, and the not long problem of life provides a rotatable formula polycrystalline diamond composite tooth and drill bit thereof.
In order to solve the above problems, the utility model discloses a realize through following technical scheme:
a rotatable polycrystalline diamond composite tooth comprises a hard alloy substrate and a polycrystalline diamond layer; the polycrystalline diamond layer is compounded on the upper surface of the hard alloy substrate; and a concave hole in the arc surface of the polycrystalline diamond composite tooth is formed in the center of the lower surface of the hard alloy substrate, and the circle center of the concave hole in the arc surface of the polycrystalline diamond composite tooth is positioned on the central axis of the whole polycrystalline diamond composite tooth.
In the above scheme, the concave hole in the arc surface of the polycrystalline diamond composite tooth is arc-shaped, elliptic arc-shaped or conical spherical arc-shaped.
In the scheme, the diameter of the concave hole in the arc surface of the polycrystalline diamond composite tooth accounts for 1/10-9/10 of the diameter of the lower surface of the whole polycrystalline diamond composite tooth, namely the diameter of the lower surface of the hard alloy substrate.
In the scheme, the surface of the concave hole in the arc surface of the polycrystalline diamond composite tooth is coated with the wear-resistant coating.
In the scheme, the outer circumferential surface of the hard alloy matrix is provided with the wear-resistant rings or a plurality of wear-resistant strips arranged at intervals.
In the scheme, the wear-resistant strip is positioned at the lower part of the outer circumferential surface of the hard alloy matrix.
Another rotatable polycrystalline diamond composite tooth comprises a cemented carbide substrate and a polycrystalline diamond layer; the polycrystalline diamond layer is compounded on the upper surface of the hard alloy substrate; the wear-resistant layer is compounded on the lower surface of the hard alloy matrix; the center of the lower surface of the wear-resistant layer is provided with a concave hole in the arc surface of the polycrystalline diamond composite tooth, and the circle center of the concave hole in the arc surface of the polycrystalline diamond composite tooth is positioned on the central axis of the whole polycrystalline diamond composite tooth.
In the above scheme, the concave hole in the arc surface of the polycrystalline diamond composite tooth is arc-shaped, elliptic arc-shaped or conical spherical arc-shaped.
In the scheme, the diameter of the concave hole in the arc surface of the polycrystalline diamond composite tooth accounts for 1/10-9/10 of the diameter of the lower surface of the whole polycrystalline diamond composite tooth, namely the diameter of the lower surface of the wear-resistant layer.
In the scheme, the outer circumferential surface of the hard alloy matrix is provided with the wear-resistant rings or a plurality of wear-resistant strips arranged at intervals.
In the scheme, the wear-resistant strip is positioned at the lower part of the outer circumferential surface of the hard alloy matrix, and the lower end of the wear-resistant strip is connected with the wear-resistant layer.
The drill bit comprises a drill bit body and N polycrystalline diamond composite teeth; n mounting holes for embedding the polycrystalline diamond composite teeth are formed in the drill bit body; the metal ball separator further comprises N metal balls and N baffles; wherein N is a set positive integer; the polycrystalline diamond composite tooth is the rotatable polycrystalline diamond composite tooth; the center of the bottom surface of the mounting hole is also provided with a mounting hole cambered surface concave hole, and the circle center of the mounting hole cambered surface concave hole is positioned on the central axis of the mounting hole; the central axis of the mounting hole is superposed with the central axis of the polycrystalline diamond composite tooth, and the concave hole in the cambered surface of the mounting hole is in mirror symmetry with the concave hole in the cambered surface of the rotatable polycrystalline diamond composite tooth; the metal ball is positioned between the concave hole in the cambered surface of the mounting hole of the bit body and the concave hole in the cambered surface of the polycrystalline diamond composite tooth; the baffle is located the edge of mounting hole to restrict polycrystalline diamond composite tooth in the mounting hole.
Compared with the prior art, the utility model has the characteristics of as follows:
1. the utility model discloses a bottom at polycrystalline diamond composite tooth sets up the internal shrinkage pool of polycrystalline diamond composite tooth cambered surface to be in the same place by metal ball and drill bit body link together, then fix through the baffle in front of polycrystalline diamond composite tooth, thereby can realize the radial flexible rotation and the limited rotation of axial direction of polycrystalline diamond composite tooth in the mounting hole; the flexibility of radial rotation enables the edge of the top surface of the polycrystalline diamond layer of the whole polycrystalline diamond composite tooth to participate in cutting work so as to improve the utilization rate of the whole polycrystalline diamond composite tooth, so that not only can the fast drilling of the polycrystalline diamond composite tooth be kept to the maximum extent, but also the premature failure of the polycrystalline diamond composite tooth can be avoided; the limited rotation in the axial direction can effectively buffer the impact of external force on the polycrystalline diamond compact, greatly improve the impact resistance of the polycrystalline composite tooth and prolong the service life of the polycrystalline composite tooth;
2. the utility model adds the wear-resistant ring or strip on the side surface of the polycrystalline diamond composite tooth, which can greatly improve the wear resistance of the side wall of the polycrystalline diamond composite tooth, thus preventing the hard alloy matrix from being seriously worn due to the friction between the polycrystalline diamond composite tooth and the mounting hole in the rotating process;
3. the utility model adds the wear-resistant layer at the bottom under the hard alloy matrix of the existing polycrystalline diamond composite tooth, and sets the concave hole in the arc surface of the polycrystalline diamond composite tooth on the wear-resistant layer, so that the wear resistance of the wear-resistant layer is between that of the polycrystalline diamond layer and the hard alloy, thereby ensuring the wear resistance of the bottom surface and the side surface of the polycrystalline diamond composite tooth, and simultaneously considering the shock resistance of the original hard alloy;
4. the utility model adds the metal ball between the mounting hole of the drill bit body of the drill bit and the polycrystalline diamond composite tooth, so as to lead the polycrystalline diamond composite tooth to freely and flexibly rotate in the mounting hole, thus avoiding the phenomenon of microcrack or even delamination caused by overhigh internal thermal stress of the polycrystalline diamond composite tooth due to welding, and greatly improving the shock resistance and the wear resistance of the polycrystalline diamond composite tooth; in addition, the small-sized metal ball does not influence the strength of the polycrystalline diamond composite tooth, the requirements on the gap precision and the centering precision of the polycrystalline diamond composite tooth and the mounting hole are not strict, and the polycrystalline diamond composite tooth with a little poor precision can also rotate well, so that the process requirements are reduced.
Drawings
Fig. 1 to 4 are schematic side cross-sectional structural views of 4 types of rotatable polycrystalline diamond composite teeth according to example 1.
Fig. 5 to 6 are schematic side cross-sectional structural views of 2 types of rotatable polycrystalline diamond composite teeth according to example 2.
FIG. 7 is a schematic top view of a drill bit.
Fig. 8 is a top-down view of one of the polycrystalline diamond compact teeth of the drill bit.
Reference numbers in the figures: 1. polycrystalline diamond composite teeth; 1-1, a hard alloy matrix; 1-2, a polycrystalline diamond layer; 1-3, wear-resistant layer; 1-4, concave holes are formed in the arc surface of the polycrystalline diamond composite tooth; 1-5, wear-resistant coating; 1-6, wear resistant strips; 2. a bit body; 2-1, mounting holes, 2-2, concave holes in the cambered surfaces of the mounting holes; 3. metal spheres; 4. and a baffle plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that directional terms such as "upper", "lower", "middle", "left", "right", "front", "rear", and the like, referred to in the examples, refer only to the direction of the drawings. Accordingly, the directions used are for illustration only and are not intended to limit the scope of the present invention.
Example 1:
a rotatable polycrystalline diamond composite tooth 1 mainly comprises a hard alloy matrix 1-1 and a polycrystalline diamond layer 1-2. The polycrystalline diamond layer 1-2 is compounded on the upper surface of the hard alloy substrate 1-1, and the polycrystalline diamond layer and the hard alloy substrate are sintered together in a high-temperature and high-pressure mode. The shape of the upper surface of the polycrystalline diamond layer 1-2 may be designed as desired, such as a flat, curved, or helmet-shaped surface. The lower surface of the cemented carbide substrate 1-1 can be designed according to the needs, such as a plane or an arc surface. In a preferred embodiment of the present invention, for convenience of description, the upper surface of the polycrystalline diamond layer 1-2 and the lower surface of the cemented carbide substrate 1-1 are both flat surfaces.
In order to realize the rotation of the polycrystalline diamond composite tooth 1, a concave hole 1-4 in an arc surface of the polycrystalline diamond composite tooth is formed in the center of the lower surface of the hard alloy substrate 1-1, and the circle center of the concave hole in the arc surface is located on the central axis of the whole polycrystalline diamond composite tooth 1. The effect of the concave holes 1-4 in the arc surface of the polycrystalline diamond composite tooth arranged under the hard alloy matrix 1-1 is that when the polycrystalline diamond composite tooth 1 is embedded into the mounting hole 2-1 of the bit body 2, the polycrystalline diamond composite tooth 1 can rotate in the mounting hole 2-1 of the bit body 2 by additionally arranging the metal ball 3 on the polycrystalline diamond composite tooth 1 and the metal ball 3, so that the top edge of the whole polycrystalline diamond composite tooth 1 can participate in cutting work. The surfaces of the concave holes 1-4 in the arc surfaces of the polycrystalline diamond composite teeth need to be smooth, and the shapes of the concave holes are preferably regular arcs, for example, the concave holes 1-4 in the arc surfaces of the polycrystalline diamond composite teeth are arc-shaped, elliptic arc-shaped or conical spherical arc-shaped. In the preferred embodiment of the present invention, the concave holes 1-4 in the arc surface of the polycrystalline diamond composite tooth are circular arc. At the lower surface of the polycrystalline diamond composite tooth 1, the diameter of a concave hole 1-4 in an arc surface of the polycrystalline diamond composite tooth accounts for 1/10-9/10 of the diameter of the lower surface of the whole polycrystalline diamond composite tooth 1. See fig. 1.
On the basis, in order to improve the wear resistance of the concave holes 1-4 in the arc surface of the polycrystalline diamond composite tooth in the rotation process of the polycrystalline diamond composite tooth 1, the surfaces of the concave holes 1-4 in the arc surface of the polycrystalline diamond composite tooth are also coated with wear-resistant coatings 1-5, and the hardness of the wear-resistant coatings 1-5 is greater than that of the hard alloy matrix 1-1, as shown in fig. 2. In the preferred embodiment of the present invention, the wear-resistant coatings 1-5 are made of polycrystalline diamond material made of diamond micro powder and binder. The diamond micro powder and the adhesive are mixed according to a certain proportion, wherein the adhesive is one or a mixture of a plurality of metal nickel, titanium, cobalt, tungsten carbide, titanium carbide, aluminum oxide, titanium nitride and the like. In the utility model discloses in, wear-resisting coating 1-5 can only cover in shrinkage pool 1-4 in above-mentioned polycrystalline diamond composite tooth cambered surface, can also cover in whole carbide base member 1-1 lower surface to further improve the wearability of whole polycrystalline diamond composite tooth 1, see fig. 3.
On the basis, considering that the side wall of the hard alloy matrix 1-1 of the polycrystalline diamond composite tooth 1 can rub against the side wall of the mounting hole 2-1 of the bit body 2 to cause abrasion of the hard alloy matrix 1-1 in the rotation process, in order to improve the hardness and the abrasion resistance of the hard alloy matrix 1-1 part of the polycrystalline diamond composite tooth 1, a plurality of abrasion-resistant strips 1-6 are arranged on the outer circumferential surface of the hard alloy matrix 1-1. The wear-resistant strips 1-6 are long strips, extend along the axial direction of the polycrystalline diamond composite tooth 1 body, and are distributed at intervals on the outer circumferential surface of the hard alloy matrix 1-1, and refer to fig. 4. In particular, when the plurality of wear strips 1-6 are arranged closely on the outer circumferential surface of the cemented carbide substrate 1-1, it is possible to form a wear ring even around the entire outer circumferential surface of the cemented carbide substrate 1-1. The wear-resistant strips 1-6 or wear-resistant rings are used as wear-resistant coatings 1-5 and only wrap the middle and/or lower part of the hard alloy matrix 1-1. The hardness of the wear-resistant strips 1-6 or the wear-resistant rings is greater than that of the hard alloy matrix 1-1. In the preferred embodiment of the present invention, the wear-resistant strips 1 to 6 or the wear-resistant ring is made of polycrystalline diamond material made of diamond micro powder and a binder, and the hardness thereof may be equal to or slightly less than the hardness of the polycrystalline diamond layer 1 to 2. The diamond micro powder and the adhesive are mixed according to a certain proportion, wherein the adhesive is one or a mixture of a plurality of metal nickel, titanium, cobalt, tungsten carbide, titanium carbide, aluminum oxide, titanium nitride and the like.
Example 2:
a rotatable polycrystalline diamond composite tooth 1 mainly comprises a hard alloy matrix 1-1, a polycrystalline diamond layer 1-2 and a wear-resistant layer 1-3. The polycrystalline diamond layer 1-2 is compounded on the upper surface of the hard alloy matrix 1-1, the wear-resistant layer 1-3 is compounded on the lower surface of the hard alloy matrix 1-1, and the polycrystalline diamond layer 1-2, the hard alloy matrix 1-1, the wear-resistant layer and the wear-resistant layer are sintered together in a high-temperature and high-pressure mode. The shape of the upper surface of the polycrystalline diamond layer 1-2 may be designed as desired, such as a flat, curved, or helmet-shaped surface. The lower surface of the wear-resistant layer 1-3 can be designed according to the needs, such as a plane or a cambered surface. In a preferred embodiment of the present invention, for convenience of description, the upper surface of the polycrystalline diamond layer 1-2 and the lower surface of the wear-resistant layer 1-3 are both flat surfaces.
In order to realize the rotation of the polycrystalline diamond composite tooth 1, concave holes 1-4 in the arc surface of the polycrystalline diamond composite tooth are formed in the center of the lower surface of the wear-resistant layer 1-3, and the circle centers of the concave holes 1-4 in the arc surface of the polycrystalline diamond composite tooth are located on the central axis of the whole polycrystalline diamond composite tooth 1. In order to enable the polycrystalline diamond composite tooth 1 to rotate in the mounting hole 2-1 of the drill bit body 2 and simultaneously improve the wear resistance of the whole polycrystalline diamond composite tooth 1 in the rotating process, the utility model discloses an add wearing layer 1-3 to set up the concave hole 1-4 in the arc surface of the polycrystalline diamond composite tooth on the wearing layer 1-3, can enable the top edge of the whole polycrystalline diamond composite tooth 1 to participate in the cutting work and guarantee the strength of the polycrystalline diamond composite tooth 1. The surfaces of the concave holes 1-4 in the arc surfaces of the polycrystalline diamond composite teeth need to be smooth, and the shapes of the concave holes are preferably regular arcs, for example, the concave holes 1-4 in the arc surfaces of the polycrystalline diamond composite teeth are arc-shaped, elliptic arc-shaped or conical spherical arc-shaped. In the preferred embodiment of the present invention, the concave holes 1-4 in the arc surface of the polycrystalline diamond composite tooth are circular arc. And at the lower surface of the polycrystalline diamond composite tooth 1, the diameter of a concave hole 1-4 in an arc surface of the polycrystalline diamond composite tooth accounts for 1/10-9/10 of the diameter of the lower surface of the whole polycrystalline diamond composite tooth 1. See fig. 5.
On the basis, considering that the side wall of the hard alloy matrix 1-1 of the polycrystalline diamond composite tooth 1 can rub against the side wall of the mounting hole 2-1 of the bit body 2 to cause abrasion of the hard alloy matrix 1-1 in the rotation process, in order to improve the hardness and the abrasion resistance of the hard alloy matrix 1-1 part of the polycrystalline diamond composite tooth 1, a plurality of abrasion-resistant strips 1-6 are arranged on the outer circumferential surface of the hard alloy matrix 1-1. The wear-resistant strips 1-6 are long strips, extend along the axial direction of the polycrystalline diamond composite tooth 1 body, and are distributed at intervals on the outer circumferential surface of the hard alloy matrix 1-1. In particular, when the plurality of wear strips 1-6 are arranged closely on the outer circumferential surface of the cemented carbide substrate 1-1, it is possible to form a wear ring even around the entire outer circumferential surface of the cemented carbide substrate 1-1. The wear-resistant strips 1-6 or wear-resistant rings are used as wear-resistant coatings 1-5 and only wrap the middle and/or lower part of the hard alloy matrix 1-1. In the preferred embodiment of the invention, the wear strips 1-6 or wear rings are located at the lower part of the outer circumferential surface of the cemented carbide substrate 1-1 and their lower ends are connected to the wear layer 1-3. The hardness of the wear-resistant strips 1-6 or the wear-resistant rings is greater than that of the hard alloy matrix 1-1. In the preferred embodiment of the present invention, the wear-resistant strips 1 to 6 or the wear-resistant ring is made of polycrystalline diamond material made of diamond micro powder and a binder, and the hardness thereof may be equal to or slightly less than the hardness of the polycrystalline diamond layer 1 to 2. The diamond micro powder and the adhesive are mixed according to a certain proportion, wherein the adhesive is one or a mixture of a plurality of metal nickel, titanium, cobalt, tungsten carbide, titanium carbide, aluminum oxide, titanium nitride and the like. See fig. 6.
Example 3:
referring to fig. 7-8, a drill bit includes a bit body 2, N polycrystalline diamond compact teeth 1, and N metal spheres 3.
The drill bit body 2 is substantially the same as the existing structure, namely N mounting holes 2-1 for mounting the polycrystalline diamond composite tooth 1 are formed in the drill bit body 2, and the number and the size of the mounting holes 2-1 are matched with the size of the polycrystalline diamond composite tooth 1. The bottom surface shape of the mounting hole 2-1 is matched with the bottom surface shape of the polycrystalline diamond composite tooth 1, and if the bottom surface of the polycrystalline diamond composite tooth 1 is in a convex arc shape, the bottom surface of the mounting hole 2-1 is also in a concave arc shape; if the bottom surface of the polycrystalline diamond composite tooth 1 is concave arc-shaped, the bottom surface of the mounting hole 2-1 is convex arc-shaped; if the bottom surface of the polycrystalline diamond composite tooth 1 is a plane, the bottom surface of the mounting hole 2-1 is also a plane, and the like. In order to enable the polycrystalline diamond composite tooth 1 to rotate in the mounting hole 2-1 of the bit body 2, a mounting hole cambered surface concave hole 2-2 is also formed in the center of the bottom surface of the mounting hole 2-1 of the bit body 2, and the circle center of the mounting hole cambered surface concave hole 2-2 is located on the central axis of the mounting hole 2-1. The structure of the concave hole 2-2 in the arc surface of the mounting hole 2-1 at the bottom surface is matched with the structure of the concave hole 1-4 in the arc surface of the polycrystalline diamond composite tooth at the lower surface of the polycrystalline diamond composite tooth 1, for example, the concave hole 2-2 in the arc surface of the mounting hole at the bottom surface of the mounting hole 2-1 can be arc-shaped, elliptic arc-shaped or conical spherical arc-shaped. In the preferred embodiment of the present invention, the concave holes 2-2 in the arc surface of the mounting hole on the bottom surface of the mounting hole 2-1 are circular arcs. The edge of the mounting hole 2-1 is provided with a baffle 4, which is used for fixing the polycrystalline diamond composite tooth 1 in the mounting hole 2-1 of the drill body 2 without leading the polycrystalline diamond composite tooth 1 to be separated from the mounting hole 2-1, and enabling the polycrystalline diamond composite tooth 1 to normally rotate in the mounting hole 2-1.
Polycrystalline diamond composite tooth 1 does rotary polycrystalline diamond composite tooth 1, polycrystalline diamond composite tooth 1 as mentioned in above-mentioned embodiment 1 and 2, shrinkage pool 1-4 in the polycrystalline diamond composite tooth cambered surface has been seted up to whole polycrystalline diamond composite tooth 1's lower surface promptly, the centre of a circle of shrinkage pool 1-4 in this polycrystalline diamond composite tooth cambered surface is located whole polycrystalline diamond composite tooth 1's axis.
The metal round ball 3 is a round ball with a smooth surface, and the metal round ball 3 is made of hard metal or metal composite material, such as copper, iron, steel or hard alloy. In the preferred embodiment of the present invention, the metal ball 3 is made of hard alloy material considering that the hard alloy has toughness and wear resistance.
In order to improve the overall wear resistance, the metal ball 3 and the mounting hole 2-1 comprise the whole bottom surface and the inner side surface of the concave hole 2-2 in the cambered surface of the mounting hole, and wear-resistant coatings 1-5 are coated on the whole bottom surface and the inner side surface of the concave hole. The wear-resistant coatings 1-5 are made of polycrystalline diamond materials made of diamond micro powder and a binder, and the hardness of the wear-resistant coatings is greater than that of the bit body 2. The diamond micro powder and the adhesive are mixed according to a certain proportion, wherein the adhesive is one or a mixture of a plurality of metal nickel, titanium, cobalt, tungsten carbide, titanium carbide, aluminum oxide, titanium nitride and the like.
When the drill bit is installed, firstly, the metal ball 3 is placed in the concave hole 2-2 in the cambered surface of the installation hole 2-1 of the drill bit body 2. And then, the rotatable polycrystalline diamond composite tooth 1 is placed into the mounting hole 2-1 of the bit body 2, and the metal ball 3 is positioned between the concave hole 2-2 in the cambered surface of the mounting hole of the bit body 2 and the concave hole 1-4 in the cambered surface of the rotatable polycrystalline diamond composite tooth 1. In the process, the central axis of the mounting hole 2-1 is enabled to coincide with the central axis of the polycrystalline diamond composite tooth 1, and the concave hole 2-2 in the mounting hole arc surface of the mounting hole 2-1 is enabled to be in mirror symmetry with the concave hole 1-4 in the polycrystalline diamond composite tooth arc surface of the rotatable polycrystalline diamond composite tooth 1. When the tool is designed, the sizes of the metal ball 3, the rotatable polycrystalline diamond composite tooth 1 and the mounting hole 2-1 of the drill bit body 2 are matched, a certain gap is reserved between the lower surface of the rotatable polycrystalline diamond composite tooth 1 and the bottom surface of the mounting hole 2-1, and a certain gap is reserved between the outer side surface of the rotatable polycrystalline diamond composite tooth 1 and the outer side surface of the mounting hole 2-1. Finally, the polycrystalline diamond composite tooth 1 is limited in the mounting hole 2-1 through the baffle 4.
It should be noted that, although the above embodiments of the present invention are illustrative, this is not a limitation of the present invention, and therefore the present invention is not limited to the above embodiments, for example, the various features of the rotatable polycrystalline diamond composite tooth 1 of the present invention can be combined arbitrarily, for example, the rotatable polycrystalline diamond composite tooth 1 of the present invention can also be applied to the similar fields of chain arm saws and the like. Other embodiments, which can be made by those skilled in the art in light of the teachings of the present invention, are considered to be within the scope of the present invention without departing from the principles thereof.
Claims (10)
1. The rotatable polycrystalline diamond composite tooth comprises a hard alloy substrate (1-1) and a polycrystalline diamond layer (1-2); the polycrystalline diamond layer (1-2) is compounded on the upper surface of the hard alloy matrix (1-1); the polycrystalline diamond composite tooth is characterized in that a concave hole (1-4) in an arc surface of the polycrystalline diamond composite tooth is formed in the center of the lower surface of the hard alloy substrate (1-1), and the circle center of the concave hole (1-4) in the arc surface of the polycrystalline diamond composite tooth is located on the central axis of the whole polycrystalline diamond composite tooth (1).
2. The rotatable polycrystalline diamond composite tooth according to claim 1, wherein the concave hole (1-4) in the arc surface of the polycrystalline diamond composite tooth is arc-shaped, elliptic arc-shaped or conical spherical arc-shaped.
3. The rotatable polycrystalline diamond composite tooth according to claim 1, wherein the diameter of the concave hole (1-4) in the arc surface of the polycrystalline diamond composite tooth accounts for 1/10-9/10 of the diameter of the lower surface of the whole polycrystalline diamond composite tooth (1), namely the diameter of the lower surface of the hard alloy substrate (1-1).
4. The rotatable polycrystalline diamond composite tooth according to claim 1, wherein the surface of the concave hole (1-4) in the arc surface of the polycrystalline diamond composite tooth is coated with the wear-resistant coating (1-5).
5. The rotatable polycrystalline diamond composite tooth according to claim 1, wherein a wear-resistant ring or a plurality of wear-resistant strips (1-6) arranged at intervals are arranged on the outer circumferential surface of the hard alloy matrix (1-1).
6. The rotatable polycrystalline diamond composite tooth comprises a hard alloy substrate (1-1) and a polycrystalline diamond layer (1-2); the polycrystalline diamond layer (1-2) is compounded on the upper surface of the hard alloy matrix (1-1); the wear-resistant alloy is characterized by further comprising a wear-resistant layer (1-3), wherein the wear-resistant layer (1-3) is compounded on the lower surface of the hard alloy matrix (1-1); the center of the lower surface of the wear-resistant layer (1-3) is provided with a concave hole (1-4) in the arc surface of the polycrystalline diamond composite tooth, and the circle center of the concave hole (1-4) in the arc surface of the polycrystalline diamond composite tooth is positioned on the central axis of the whole polycrystalline diamond composite tooth (1).
7. The rotatable polycrystalline diamond composite tooth according to claim 6, wherein the concave holes (1-4) in the arc surface of the polycrystalline diamond composite tooth are arc-shaped, elliptic arc-shaped or conical spherical arc-shaped.
8. The rotatable polycrystalline diamond composite tooth according to claim 6, wherein a wear-resistant ring or a plurality of wear-resistant strips (1-6) arranged at intervals are arranged on the outer circumferential surface of the hard alloy matrix (1-1).
9. The rotatable polycrystalline diamond composite tooth according to claim 6, wherein the wear resistant strip (1-6) is located at the lower part of the outer circumferential surface of the cemented carbide substrate (1-1), and the lower end thereof is connected with the wear resistant layer (1-3).
10. The drill bit comprises a drill bit body (2) and N polycrystalline diamond composite teeth (1); n mounting holes (2-1) for embedding the polycrystalline diamond composite teeth (1) are formed in the drill bit body (2); the method is characterized in that: the metal ball separator further comprises N metal balls (3) and N baffles (4); wherein N is a set positive integer;
the polycrystalline diamond composite tooth (1) is the rotatable polycrystalline diamond composite tooth as claimed in claims 1-8;
a mounting hole cambered surface concave hole (2-2) is also formed in the center of the bottom surface of the mounting hole (2-1), and the circle center of the mounting hole cambered surface concave hole (2-2) is located on the central axis of the mounting hole (2-1);
the central axis of the mounting hole (2-1) is superposed with the central axis of the polycrystalline diamond composite tooth (1), and the concave hole (2-2) in the cambered surface of the mounting hole is in mirror symmetry with the concave hole (1-4) in the cambered surface of the polycrystalline diamond composite tooth; the metal ball (3) is positioned between the concave hole (2-2) in the cambered surface of the mounting hole of the bit body (2) and the concave hole (1-4) in the cambered surface of the polycrystalline diamond composite tooth;
the baffle (4) is positioned at the edge of the mounting hole (2-1) and limits the polycrystalline diamond composite tooth (1) in the mounting hole (2-1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020182104.XU CN212130404U (en) | 2020-02-18 | 2020-02-18 | Rotatable polycrystalline diamond composite tooth and drill bit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020182104.XU CN212130404U (en) | 2020-02-18 | 2020-02-18 | Rotatable polycrystalline diamond composite tooth and drill bit thereof |
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| CN212130404U true CN212130404U (en) | 2020-12-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155937A (en) * | 2020-02-18 | 2020-05-15 | 桂林星钻超硬材料有限公司 | Rotatable polycrystalline diamond composite tooth and drill bit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155937A (en) * | 2020-02-18 | 2020-05-15 | 桂林星钻超硬材料有限公司 | Rotatable polycrystalline diamond composite tooth and drill bit thereof |
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