CN212689932U

CN212689932U - Rotatable diamond compact

Info

Publication number: CN212689932U
Application number: CN202021026430.8U
Authority: CN
Inventors: 陈功武; 花波波; 张钲; 陈强
Original assignee: Zhengzhou Haocheng Superhard Tool Co ltd; Henan Yalong Diamond Tools Co ltd
Current assignee: Zhengzhou Haocheng Superhard Tool Co ltd; Henan Yalong Diamond Tools Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-03-12
Anticipated expiration: 2030-06-08

Abstract

A rotatable diamond compact comprises a polycrystalline diamond layer and a hard alloy assembly, wherein the hard alloy assembly comprises a hard alloy substrate sintered with the polycrystalline diamond layer at high temperature and high pressure, and the hard alloy substrate is rotatably arranged in a hard alloy cup. The utility model discloses a change the structure of the compound piece of diamond, make it become 360 rotatory cutting by traditional single-edge cutting, greatly improved the wear resistance of product, still guaranteed simultaneously that the blade can keep efficient sharp state constantly, furthest's improvement the life of drill bit, still the cost is reduced.

Description

Rotatable diamond compact

Technical Field

The utility model relates to a superhard composite material field, concretely relates to compound piece of rotatable diamond, the preparation of mainly used drill bit can be applied to fields such as all kinds of geological drilling, oil field exploration, mine probing mining.

Background

The diamond composite sheet widely applied at present comprises a polycrystalline diamond layer and a hard alloy substrate, wherein the diamond is combined with the polycrystalline diamond layer by a high-temperature and high-pressure method to form the polycrystalline diamond, and the polycrystalline diamond is firmly combined with the hard alloy substrate, so that a composite material simultaneously comprising the diamond and the hard alloy is formed. At present, most of the diamond compacts which are widely applied are of an integral structure, only a certain single cutting edge of the diamond compacts is used in the actual drilling and production process, and the rest parts cannot participate in drilling and production due to being fixed. When the cutting edge is worn out or broken during use, the diamond compact is ineffective. Thus, the product utilization rate is too low, and unnecessary resource waste is caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to above-mentioned problem, a rotatable diamond compact piece is provided to solve traditional diamond compact piece life-span weak point, drilling inefficiency scheduling defect.

The utility model discloses a rotatable diamond compact piece adopts following technical scheme:

a rotatable diamond compact comprises a polycrystalline diamond layer 1 and a hard alloy assembly, wherein the hard alloy assembly comprises a hard alloy substrate 2 sintered with the polycrystalline diamond layer 1 at high temperature and high pressure, and the hard alloy substrate 2 is rotatably arranged in a hard alloy cup 3.

Preferably, the hard alloy cup 3 is coaxial with the hard alloy matrix 2 from the outside.

Preferably, the longitudinal section of the hard alloy matrix 2 is T-shaped; the upper surface of the T-shaped hard alloy substrate 2 and the polycrystalline diamond layer 1 are sintered together, the lower part of the T-shaped hard alloy substrate 2 is inserted into the hard alloy cup 3, and the outer surface of the lower part of the T-shaped hard alloy substrate 2 is in clearance fit with the inner surface of the hard alloy cup 3.

Preferably, the hard alloy cup 3 is internally of a special-shaped structure and consists of three sections of structures, namely an upper section, a middle section and a lower section; wherein, the upper section is conical, and the middle section and the lower section of the hard alloy cup 3 are both cylindrical structures; the axial length ratio of the three sections is as follows: 1 (0.1-0.2) and (0.2-4).

Preferably, the conical interior of the upper section of the hard alloy cup 3 is of a conical structure with a small opening at the upper end and a large opening at the lower end, and the conical angle is 1-10 degrees.

Preferably, the T-shaped lower part of the cemented carbide substrate 2 is provided with an annular groove A21, the cemented carbide cup 3 is internally provided with an annular groove B31, and the annular groove A21 is connected with the annular groove B31 through a circlip 4.

Preferably, the annular groove A21 and the annular groove B31 are coaxially arranged with the cemented carbide substrate 2, and the diameter of the inner circle where the annular groove A21 is located is smaller than that of the cemented carbide substrate 2; the annular groove B31 is formed in an outer circle having a diameter larger than that of the cemented carbide substrate 2.

Preferably, the position of the elastic collar 4 is located at the middle position of the hard alloy cup 3.

The utility model has the advantages that: through changing the structure of the diamond compact piece, the cutting of traditional single-edge is changed into 360-degree rotary cutting, the wear resistance of the product is greatly improved, the cutting edge is guaranteed to be capable of keeping a high-efficiency sharp state all the time, the service life of the drill bit is prolonged to the maximum extent, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a cross-sectional view of a diamond compact according to the present invention;

FIG. 2 is a sectional view of the cemented carbide cup of the present invention;

FIG. 3 is a sectional view of the integrated structure of the polycrystalline diamond layer and the hard alloy substrate

Reference numerals:

1: a polycrystalline diamond layer; 2: a cemented carbide substrate; 21: an annular groove A; 3: a hard alloy cup; 31: an annular groove B; 4: a circlip; θ: the angle of the taper.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.

In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and may be fixedly connected, or may be integrally connected or detachably connected; may be directly connected or indirectly connected through an intermediate. The meaning of the above terms in the present invention can be determined according to specific situations by persons skilled in the art, and should not be construed as limiting the present invention.

Polycrystalline Diamond Compact (PDC) belongs to a functional material, and is formed by sintering diamond micropowder and a hard alloy substrate under the condition of ultrahigh pressure and high temperature, so that the polycrystalline diamond compact has the high hardness, high wear resistance and thermal conductivity of diamond, and the strength and impact toughness of hard alloy, and is an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools. The composite material formed by adhering the polycrystalline diamond thin layer on the hard alloy substrate is called a diamond compact. The diamond compact has the extremely high wear resistance of polycrystalline diamond and the high impact resistance of hard alloy, and the diamond layer can always keep a sharp cutting edge, so that the diamond compact has a very good effect when used in soft to medium hard strata in petroleum and geological drilling. The diamond content in the composite sheet is up to 99%, so that the diamond layer has extremely high hardness and excellent wear resistance, and the Knoop hardness of the diamond layer is (6.5-7). times.104 MPa or even higher. The thickness of the film is very thin, and is generally controlled to be about 0.5-1 mm. The cutting edge of the vertical insert welding drill bit is sharp and always keeps self-sharpening, and the vertical insert welding drill bit is also called a micro cutter drill bit.

Cemented carbide is an alloy material made from a hard compound of refractory metals and a binder metal by a powder metallurgy process. The hard alloy has a series of excellent performances of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, particularly high hardness and wear resistance, basically keeps unchanged even at the temperature of 500 ℃, and still has high hardness at the temperature of 1000 ℃.

The embodiment of the diamond compact of the utility model, as shown in fig. 1 and 2, the rotatable diamond compact includes polycrystalline diamond layer 1, carbide base member 2, carbide cup 3, circlip 4. The utility model discloses rotatable structure does: the rotatable diamond compact comprises a polycrystalline diamond layer 1 and a hard alloy assembly, wherein the hard alloy assembly comprises a hard alloy substrate 2 sintered with the polycrystalline diamond layer 1 at high temperature and high pressure, the hard alloy substrate 2 is rotatably arranged in a hard alloy cup 3, and the outside of the hard alloy cup 3 is coaxial with the hard alloy substrate 2.

The polycrystalline diamond layer 1 and the hard alloy substrate 2 are integrally formed by sintering together at high temperature and high pressure, and the longitudinal section of the hard alloy substrate 2 is T-shaped. The upper surface of the T-shaped hard alloy substrate 2 and the polycrystalline diamond layer 1 are sintered together, the lower part of the T-shaped hard alloy substrate 2 is inserted into the hard alloy cup 3, and the outer surface of the lower part of the T-shaped hard alloy substrate 2 is in clearance fit with the inner surface of the hard alloy cup 3.

The entire cemented carbide cup 3 may have any shape, and the embodiment will be described with the entire cemented carbide cup 3 being cylindrical. The cylindrical hard alloy cup 3 is hollow, the lower part of the T-shaped hard alloy matrix 2 is inserted into the hollow interior of the hard alloy cup 3, the transverse section of the upper surface of the T-shaped hard alloy matrix 2 is circular, and the diameter of the T-shaped hard alloy matrix is the same as that of the cylindrical hard alloy cup 3.

The hollow interior of the hard alloy cup 3 is of a special-shaped structure and consists of three sections of structures, namely an upper section, a middle section and a lower section. The upper section is a conical cylinder, the interior of the conical cylinder is of a conical structure with a small upper end opening and a large lower end opening, and the conical angle theta is 1-10 degrees and can be set to be 2 degrees, 3 degrees, 5 degrees, 7 degrees, 9 degrees and the like according to actual requirements; the middle section and the lower section of the hard alloy cup 3 are both cylindrical structures, and the three sections are in smooth transition. The axial length ratio of the three sections is as follows: 1 (0.1-0.2): (0.2-4), which may be 1:0.1:0.2, or 1:0.1:4, or 1:0.2:0.2, or 1:0.2:4, or 1:0.15:1, or 1:0.13:1.5, or 1:0.18:2, or 1:0.15:3, etc.

As shown in fig. 3, an annular groove a21 is provided in the T-shaped lower portion of the cemented carbide substrate 2, the annular groove a21 is provided coaxially with the cemented carbide substrate 2, and the diameter of the inner circle in which the annular groove a21 is located is smaller than the diameter of the cemented carbide substrate 2. As shown in fig. 2, an annular groove B31 is arranged inside the cemented carbide cup 3, the annular groove B31 is coaxially arranged with the cemented carbide base 2, the diameter of the outer circle where the annular groove B31 is located is larger than that of the cemented carbide base 2, the annular groove a21 is connected with the annular groove B31 through a circlip 4, that is, the cemented carbide base 2 is connected with the cemented carbide cup 3 through the circlip 4, and the position of the circlip 4 is just located at the middle position of the cemented carbide cup 3. By adopting the structural design, the hard alloy base body 2 and the hard alloy cup 3 can freely rotate for 360 degrees.

It should be noted that the heights of the annular groove a21 and the annular groove B31 may be equal or different, and are preferably equal to each other, as long as the elastic collar 4 can be placed between the two grooves to rotate, but the heights are smaller than the height of the middle section of the hard alloy cup 3.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims

1. A rotatable diamond compact comprises a polycrystalline diamond layer (1) and a hard alloy component, and is characterized in that: the hard alloy component comprises a hard alloy substrate (2) which is sintered with the polycrystalline diamond layer (1) at high temperature and high pressure, and the hard alloy substrate (2) is rotatably arranged in a hard alloy cup (3).

2. The rotatable diamond compact of claim 1, wherein: the outer part of the hard alloy cup (3) is coaxial with the hard alloy matrix (2).

3. The rotatable diamond compact of claim 1, wherein: the longitudinal section of the hard alloy matrix (2) is T-shaped; the upper surface of the T-shaped hard alloy matrix (2) and the polycrystalline diamond layer (1) are sintered together, the lower part of the T-shaped hard alloy matrix (2) is inserted into the hard alloy cup (3), and the outer surface of the lower part of the T-shaped hard alloy matrix (2) is in clearance fit with the inner surface of the hard alloy cup (3).

4. The rotatable diamond compact of claim 2 or 3, wherein: the hard alloy cup (3) is internally of a special-shaped structure and consists of an upper section, a middle section and a lower section which are all three sections of structures; wherein, the upper section is conical, and the middle section and the lower section of the hard alloy cup (3) are both cylindrical structures; the axial length ratio of the three sections is as follows: 1 (0.1-0.2) and (0.2-4).

5. The rotatable diamond compact of claim 4, wherein: the conical inner part of the upper section of the hard alloy cup (3) is of a conical structure with a small opening at the upper end and a large opening at the lower end, and the conical angle is 1-10 degrees.

6. The rotatable diamond compact of claim 4, wherein: an annular groove A (21) is formed in the T-shaped lower portion of the hard alloy base body (2), an annular groove B (31) is formed in the hard alloy cup (3), and the annular groove A (21) and the annular groove B (31) are connected through an elastic retainer ring (4).

7. The rotatable diamond compact of claim 6, wherein: the annular groove A (21) and the annular groove B (31) are coaxially arranged with the hard alloy substrate (2), and the diameter of the inner circle where the annular groove A (21) is located is smaller than that of the hard alloy substrate (2); the diameter of the outer circle where the annular groove B (31) is located is larger than that of the hard alloy substrate (2).

8. The rotatable diamond compact of claim 7, wherein: the position of the elastic retainer ring (4) is positioned at the middle section of the hard alloy cup (3).