CN111570785A

CN111570785A - Method for processing diamond drill bit

Info

Publication number: CN111570785A
Application number: CN202010396719.7A
Authority: CN
Inventors: 李晓磊; 徐清; 蔡纪雄; 赵俊彩; 吴乔
Original assignee: Zhongdizhuang Wuxi Drilling Tools Co ltd
Current assignee: Zhongdizhuang Wuxi Drilling Tools Co ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2020-08-25

Abstract

The invention relates to a processing method of a diamond drill bit, which comprises the following steps: (1) mixing the powder, the diamond and the binder to obtain a mixed material; (2) and (2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond bit. According to the invention, the cold pressing preforming process is added and coupled with the assembling and sintering processes, so that the uniformity of the prepared diamond bit matrix is ensured, the wear resistance and impact resistance of the bit matrix are improved, and the diamond bit matrix has a good effect on a stratum with strong abrasiveness. Furthermore, because the preformed tire body block is compact, the height of a graphite mold used for subsequent assembly can be reduced, so that the consumption of the graphite mold is saved, and the energy is also saved.

Description

Method for processing diamond drill bit

Technical Field

The invention relates to the field of drill bits, in particular to a method for processing a diamond drill bit.

Background

Currently, drill bits are rock breaking tools used in drilling operations to break rock and form wellbores. The diamond-impregnated bit is generally applied to drilling production at present, has the characteristics of high pressure resistance, high abrasion resistance and good impact resistance, is suitable for drilling compact conglomerates of strata which are difficult to drill for PDC bits and roller bits, and have high hardness and high abrasiveness.

The diamond-impregnated bit is characterized in that the thin diamonds are uniformly distributed in a bit matrix, the bit is provided with the matrix with different hardness, and can drill rocks with various hardness, particularly rocks with hardness higher than medium hardness, the drilling efficiency is high, the cost is low, the core sampling rate is high, the drilling flexibility is small, and the drill holes with any inclination angle can be drilled.

For example, CN109694977A discloses a method for preparing impregnated diamond, comprising the following steps: preparing raw materials into the impregnated diamond by adopting an electron beam selective melting technology, wherein the raw materials comprise the following components in volume fraction which are uniformly mixed: 15% -38.5% of cast WC powder; 12.5% -31.25% of nickel-plated diamond powder; 15% -38.5% of NiBSi solid solution alloy powder. According to the preparation method of the impregnated diamond, the hardness of the cast WC powder is high. The melting point of the NiBSi solid solution alloy powder is relatively low and lower than that of a nickel simple substance, the nickel-plated diamond powder is adopted in the raw material, and the nickel layer is arranged on the surface of the nickel-plated diamond for protection, and the low melting point of the NiBSi solid solution alloy powder can effectively prevent the diamond inside the nickel-plated diamond from being carbonized. Therefore, the preparation method of the impregnated diamond can improve the compactness, the bending strength and the wear resistance of the prepared impregnated diamond. CN105779850A discloses a strong diamond-impregnated bit matrix and a preparation method of a bit, wherein the matrix comprises the following raw materials in parts by weight: 45-55 parts of pure Fe powder, 30-40 parts of pure Cu powder, 12-18 parts of mixed powder of pure Sn and pure Zn, 3-5 parts of mixed powder of pure Co and pure Ni and 1 part of mixed powder of pure La and pure Ce; wherein, the two metals in each mixed powder are in any proportion. The provided tire body has higher hardness and stronger plasticity, strong wear resistance, strong embedding capacity to diamond abrasive particles, and the abrasion speed of the tire body is slower and far lower than that of the diamond abrasive particles. The preparation method of the strong diamond-impregnated bit comprising the matrix comprises the steps of preparing the matrix, mixing the matrix with diamond, hot-pressing and sintering, preserving heat, cooling and brazing, and the prepared diamond-impregnated bit has better wear resistance, can improve the processing efficiency and the processing quality and can prolong the service life of the diamond bit when being used for processing marble.

However, in the prior art, the powder is loose after being directly manually assembled after being mixed, and the reassembling process of a carcass layer is easy to delaminate and is not uniform.

Disclosure of Invention

In view of the problems in the prior art, the invention aims to provide a method for processing a diamond bit, which can ensure the uniformity of a prepared diamond bit matrix, improve the wear resistance and impact resistance of the bit matrix and have good effect on a stratum with strong abrasiveness.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a processing method of a diamond drill bit, which comprises the following steps:

(1) mixing the powder, the diamond and the binder to obtain a mixed material;

(2) and (2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond bit.

According to the invention, the cold pressing preforming process is added and coupled with the assembling and sintering processes, so that the uniformity of the prepared diamond bit matrix is ensured, the wear resistance and impact resistance of the bit matrix are improved, and the diamond bit matrix has a good effect on a stratum with strong abrasiveness. Furthermore, because the preformed tire body block is compact, the height of a graphite mold used for subsequent assembly can be reduced, so that the consumption of the graphite mold is saved, and the energy is also saved.

As a preferable technical scheme of the invention, the powder material in the step (1) comprises, by mass, 28-32% of tungsten carbide powder, 3-7% of cobalt powder, 9-12% of nickel powder, 3-6% of manganese powder and the balance of copper powder.

In the present invention, the content of the tungsten carbide powder in the powder is 28 to 32%, and may be, for example, 28%, 29%, 30%, 31%, or 32%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In the present invention, the content of cobalt powder in the powder material is 3 to 7%, and may be, for example, 3%, 4%, 5%, 6%, or 7%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In the present invention, the nickel powder content in the powder is 9 to 12%, for example, 9%, 10%, 11%, or 12%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In the present invention, the content of manganese powder in the powder is 3 to 6%, and may be, for example, 3%, 4%, 5%, or 6%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

As a preferred technical scheme of the invention, the granularity of the powder material in the step (1) is 250-350 meshes, for example, 250 meshes, 260 meshes, 270 meshes, 280 meshes, 290 meshes, 300 meshes, 310 meshes, 320 meshes, 330 meshes, 340 meshes or 350 meshes, etc., but is not limited to the values listed, and other values not listed in the range are also applicable.

Preferably, the amount of the powder material added in the step (1) is 80-100% by mass of the diamond, for example, 80%, 85%, 90%, 95%, or 100%, but not limited to the recited values, and other values not recited in the range are also applicable.

In a preferred embodiment of the present invention, the diamond in step (1) has a particle size of 40 to 60 mesh, for example, 40 mesh, 45 mesh, 50 mesh, 55 mesh or 60 mesh, but the present invention is not limited to the above-mentioned values, and other values not listed in the above range are also applicable.

As a preferable technical scheme of the invention, the binder in the step (1) comprises paraffin.

Preferably, the amount of the binder added in step (1) is 1-5% of the mass of the diamond, and may be, for example, 1%, 2%, 3%, 4%, or 5%, but is not limited to the recited values, and other values not recited in the range are also applicable.

According to a preferable technical scheme of the invention, the cold pressing preforming in the step (2) is to press the mixed material obtained in the step (1) into a tire body block.

Preferably, the pressure in the cold preforming in step (2) is 0.5 to 1.5MPa, and may be, for example, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1MPa, 1.1MPa, 1.2MPa, 1.3MPa, 1.4MPa or 1.5MPa, but is not limited to the values listed, and other values not listed in this range are also applicable.

As a preferred technical solution of the present invention, in the assembling in step (2), the carcass block is placed in a mold, and after a polycrystalline is obtained by adding the substitute block, a transition layer is added.

Preferably, the mould comprises a graphite mould.

Preferably, the substitute block comprises a graphite substitute block.

Preferably, the transition layer comprises, by mass, 28-32% of tungsten carbide powder, 3-7% of cobalt powder, 9-12% of nickel powder, 3-6% of manganese powder, and the balance copper powder.

According to the invention, the mixed powder is pressed into a compact and dense tire body block by using a cold pressing die manufactured according to the type of a drill bit, and the pressed tire body block is not layered and scattered due to the addition of a binder, so that the tire body is not scattered, the edges are not broken and the corners are not dropped when the tire body block is taken up by hands. The process can be realized mechanically, and manual participation is reduced. In the subsequent assembly process, the pressed carcass block is directly placed into a graphite mold to complete the assembly process, and the process is simple and rapid. Because the preformed tire body block is compact, the height of the graphite mold used for subsequent assembly can be reduced, so that the consumption of the graphite mold is saved, and the energy is also saved.

In the present invention, the content of the tungsten carbide powder in the transition layer is 28 to 32%, and may be, for example, 28%, 29%, 30%, 31%, or 32%, but is not limited to the values listed, and other values not listed in the range are also applicable.

In the present invention, the content of the cobalt powder in the transition layer is 3 to 7%, and may be, for example, 3%, 4%, 5%, 6%, or 7%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In the present invention, the content of the nickel powder in the transition layer is 9 to 12%, for example, 9%, 10%, 11%, or 12%, but is not limited to the above-mentioned values, and other values not shown in the above range are also applicable.

In the present invention, the content of manganese powder in the transition layer is 3 to 6%, and may be, for example, 3%, 4%, 5%, or 6%, but is not limited to the above-mentioned values, and other values not shown in the above range are also applicable.

As a preferred embodiment of the present invention, the sintering temperature in step (2) is 960-1000 ℃, for example 960 ℃, 970 ℃, 980 ℃, 990 ℃ or 1000 ℃, but not limited to the values listed, and other values not listed in the range are also applicable.

In a preferred embodiment of the present invention, the sintering time in the step (2) is 4 to 6min, for example, 4min, 4.5min, 5min, 5.5min, or 6min, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

As a preferred technical scheme of the invention, the method comprises the following steps:

(1) mixing the powder, the diamond and the binder to obtain a mixed material; the powder comprises, by mass, 28-32% of tungsten carbide powder, 3-7% of cobalt powder, 9-12% of nickel powder, 3-6% of manganese powder, and the balance of copper powder; the granularity of the powder is 250-350 meshes; the addition amount of the powder is 80-100% of the mass of the diamond; the granularity of the diamond is 40-60 meshes; the binder comprises paraffin wax; the addition amount of the binder is 1-5% of the mass of the diamond; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block;

(2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond drill bit; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block; the pressure in the cold-pressing preforming is 0.5-1.5 MPa; the assembling is that the carcass block is placed in a mould, and a transition layer is added after the substitution block is added and polycrystalline; the mold comprises a graphite mold; the replacement block comprises a graphite replacement block; the transition layer comprises, by mass, 28-32% of tungsten carbide powder, 3-7% of cobalt powder, 9-12% of nickel powder, 3-6% of manganese powder, and the balance of copper powder; the sintering temperature is 960-1000 ℃; the sintering time is 4-6 min.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, the cold pressing preforming process is added and coupled with the assembling and sintering processes, so that the uniformity of the prepared diamond bit matrix is ensured, the wear resistance and impact resistance of the bit matrix are improved, and the diamond bit matrix has a good effect on a stratum with strong abrasiveness.

(2) Because the preformed tire body block is compact, the height of the graphite mold used for subsequent assembly can be reduced, so that the consumption of the graphite mold is saved, and the energy is also saved.

The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.

Detailed Description

To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:

example 1

The embodiment provides a method for processing a diamond drill bit, which comprises the following steps:

(1) mixing the powder, the diamond and the binder to obtain a mixed material; the powder comprises 30% of tungsten carbide powder, 5% of cobalt powder, 9% of nickel powder, 6% of manganese powder and the balance of copper powder in percentage by mass; the granularity of the powder is 300 meshes; the addition amount of the powder is 85% of the mass of the diamond; the granularity of the diamond is 45 meshes; the binder comprises paraffin wax; the addition amount of the binder is 2% of the mass of the diamond; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block;

(2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond drill bit; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block; the pressure in the cold pressing preforming is 0.5 MPa; the assembling is that the carcass block is placed in a mould, and a transition layer is added after the substitution block is added and polycrystalline; the mold comprises a graphite mold; the replacement block comprises a graphite replacement block; the transition layer comprises 28% of tungsten carbide powder, 3% of cobalt powder, 12% of nickel powder, 3% of manganese powder and the balance of copper powder in percentage by mass; the sintering temperature is 980 ℃; the sintering time is 4.5 min.

The uniformity of the obtained diamond bit matrix is obviously improved.

Example 2

(1) mixing the powder, the diamond and the binder to obtain a mixed material; the powder comprises 32 mass percent of tungsten carbide powder, 6 mass percent of cobalt powder, 11.2 mass percent of nickel powder, 4 mass percent of manganese powder and the balance of copper powder; the granularity of the powder is 260 meshes; the addition amount of the powder is 97 percent of the mass of the diamond; the granularity of the diamond is 44 meshes; the binder comprises paraffin wax; the addition amount of the binder is 5% of the mass of the diamond; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block;

(2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond drill bit; the pressure in the cold pressing preforming is 1.2 MPa; the assembling is that the carcass block is placed in a mould, and a transition layer is added after the substitution block is added and polycrystalline; the mold comprises a graphite mold; the replacement block comprises a graphite replacement block; the transition layer comprises 31% of tungsten carbide powder, 6% of cobalt powder, 10% of nickel powder, 5% of manganese powder and the balance of copper powder in percentage by mass; the sintering temperature is 1000 ℃; the sintering time is 6 min.

The uniformity of the obtained diamond bit matrix is obviously improved.

Example 3

(1) mixing the powder, the diamond and the binder to obtain a mixed material; the powder comprises 28% of tungsten carbide powder, 3% of cobalt powder, 11% of nickel powder, 3% of manganese powder and the balance of copper powder by mass percentage; the granularity of the powder is 265 meshes; the addition amount of the powder is 82% of the mass of the diamond; the granularity of the diamond is 42 meshes; the binder comprises paraffin wax; the addition amount of the binder is 3.7% of the mass of the diamond; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block;

(2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond drill bit; the pressure in the cold pressing preforming is 0.87 MPa; the assembling is that the carcass block is placed in a mould, and a transition layer is added after the substitution block is added and polycrystalline; the mold comprises a graphite mold; the replacement block comprises a graphite replacement block; the transition layer comprises, by mass, 31% of tungsten carbide powder, 4.8% of cobalt powder, 9.7% of nickel powder, 4.7% of manganese powder, and the balance of copper powder; the sintering temperature is 1000 ℃; the sintering time is 5 min.

The uniformity of the obtained diamond bit matrix is obviously improved.

Example 4

(1) mixing the powder, the diamond and the binder to obtain a mixed material; the powder comprises 29 percent of tungsten carbide powder, 5 percent of cobalt powder, 12 percent of nickel powder, 5.5 percent of manganese powder and the balance of copper powder by mass percentage; the granularity of the powder is 345 meshes; the addition amount of the powder is 87 percent of the mass of the diamond; the granularity of the diamond is 57 meshes; the binder comprises paraffin wax; the addition amount of the binder is 1% of the mass of the diamond; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block;

(2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond drill bit; the pressure in the cold-pressing preforming is 0.57 MPa; the assembling is that the carcass block is placed in a mould, and a transition layer is added after the substitution block is added and polycrystalline; the mold comprises a graphite mold; the replacement block comprises a graphite replacement block; the transition layer comprises, by mass, 28.7% of tungsten carbide powder, 6.7% of cobalt powder, 11.6% of nickel powder, 5.8% of manganese powder, and the balance of copper powder; the sintering temperature is 987 ℃; the sintering time was 4.7 min.

The uniformity of the obtained diamond bit matrix is obviously improved.

Example 5

(1) mixing the powder, the diamond and the binder to obtain a mixed material; the powder comprises, by mass, 31.7% of tungsten carbide powder, 5.6% of cobalt powder, 9.8% of nickel powder, 5.8% of manganese powder, and the balance of copper powder; the granularity of the powder is 347 meshes; the addition amount of the powder is 84% of the mass of the diamond; the granularity of the diamond is 44 meshes; the binder comprises paraffin wax; the addition amount of the binder is 1.2% of the mass of the diamond; the cold pressing preforming step is to press the mixed material obtained in the step (1) into a tire body block;

(2) sequentially carrying out cold pressing preforming, assembling and sintering on the mixed material obtained in the step (1) to obtain the diamond drill bit; the pressure in the cold-pressing preforming is 1.27 MPa; the assembling is that the carcass block is placed in a mould, and a transition layer is added after the substitution block is added and polycrystalline; the mold comprises a graphite mold; the replacement block comprises a graphite replacement block; the transition layer comprises 30.7% of tungsten carbide powder, 5.5% of cobalt powder, 10.6% of nickel powder, 5.5% of manganese powder and the balance of copper powder in percentage by mass; the sintering temperature is 976 ℃; the sintering time is 4.8 min.

The uniformity of the obtained diamond bit matrix is obviously improved.

Comparative example 1

The only difference from example 1 is that the cold press pre-forming was not performed and the uniformity of the resulting diamond bit matrix was not improved.

Comparative example 2

The difference from example 1 is only that the addition amount of the binder is 0.1% of the diamond mass, and the uniformity of the obtained diamond bit matrix is not improved.

Comparative example 3

The difference from example 1 is only that the binder is added in an amount of 10% by mass of diamond, and the uniformity of the resulting diamond bit matrix is not improved.

Comparative example 4

Only differs from example 1 in that the pressure in the cold press preform is 0.1 MPa; and the uniformity of the obtained diamond bit matrix is not improved.

Comparative example 5

Only differs from example 1 in that the pressure in the cold press preform is 5 MPa; the uniformity of the resulting diamond bit matrix is not improved.

According to the results of the embodiment and the comparative example, the cold pressing preforming process is added and coupled with the assembling and sintering, so that the uniformity of the prepared diamond bit matrix is ensured, the wear resistance and impact resistance of the bit matrix are improved, and the diamond bit matrix has a good effect on a stratum with strong abrasiveness. Furthermore, because the preformed tire body block is compact, the height of a graphite mold used for subsequent assembly can be reduced, so that the consumption of the graphite mold is saved, and the energy is also saved.

The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. A method of machining a diamond drill bit, the method comprising the steps of:

(1) mixing the powder, the diamond and the binder to obtain a mixed material;

2. The method of claim 1, wherein the powder of step (1) comprises, by mass, 28-32% of tungsten carbide powder, 3-7% of cobalt powder, 9-12% of nickel powder, 3-6% of manganese powder, and the balance copper powder.

3. The method according to claim 1 or 2, wherein the powder in step (1) has a particle size of 250-350 mesh;

preferably, the addition amount of the powder material in the step (1) is 80-100% of the mass of the diamond.

4. The method of any one of claims 1-3, wherein the diamond of step (1) has a particle size of 40-60 mesh.

5. The method of any one of claims 1-4, wherein the binder of step (1) comprises paraffin wax;

preferably, the addition amount of the binder in the step (1) is 1-5% of the mass of the diamond.

6. The method according to any one of claims 1 to 5, wherein the cold press preforming of step (2) is to press the mixture obtained in step (1) into a carcass block;

preferably, the pressure in the cold press preform of step (2) is 0.5 to 1.5 MPa.

7. The method of claim 6, wherein the assembling of step (2) is that the carcass block is placed in a mold, and a transition layer is added after polycrystalline is obtained by adding the substitute block;

preferably, the mold comprises a graphite mold;

preferably, the substitute block comprises a graphite substitute block;

8. The method as claimed in any one of claims 1 to 7, wherein the sintering temperature in step (2) is 960-1000 ℃.

9. The method of any one of claims 1-8, wherein the sintering time of step (2) is 4-6 min.

10. A method according to any one of claims 1-9, characterized in that the method comprises the steps of: