CN113414716B - Wear-resistant diamond grinding wheel and preparation method thereof - Google Patents
Wear-resistant diamond grinding wheel and preparation method thereof Download PDFInfo
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- CN113414716B CN113414716B CN202110562604.5A CN202110562604A CN113414716B CN 113414716 B CN113414716 B CN 113414716B CN 202110562604 A CN202110562604 A CN 202110562604A CN 113414716 B CN113414716 B CN 113414716B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
- B24D3/10—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for porous or cellular structure, e.g. for use with diamonds as abrasives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention discloses a wear-resistant diamond-impregnated wheel, in particular to the technical field of diamond-impregnated wheels, which comprises a matrix and a cutter head, wherein the cutter head comprises the following raw materials in parts by weight: copper, iron, modified diamond, nickel, chromium, vanadium, rare earth elements and a composite bonding agent, wherein the composite bonding agent comprises cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micropowder. The titanium hydride is better attached to the surface of the diamond particles, the consolidation force of the diamond particles attached with titanium is improved, the falling off of the particles in the use process is reduced, nickel, chromium, vanadium and rare earth elements are added into the diamond tool bit, the vanadium and the rare earth elements can refine the crystal grains in the tool bit, the strength and the wear resistance of the diamond tool bit are improved, the rare earth elements can further promote the alloying of a matrix, and the hardness and the anti-deformation strength of the diamond tool bit are improved.
Description
Technical Field
The invention relates to the technical field of diamond-impregnated wheels, in particular to a wear-resistant diamond-impregnated wheel and a preparation method thereof.
Background
Diamond is one of the materials with highest hardness known in the world at present, and has the characteristics of high hardness, good wear resistance, high thermal conductivity and the like, and is incomparable with common abrasive materials. The diamond micropowder is an ideal raw material for grinding and polishing high-hardness nonmetallic materials such as stone, ceramics, precious stone, optical glass and the like. Meanwhile, the diamond micro powder can be synthesized artificially, so that the problem of environmental pollution is solved, and the national energy-saving and environment-friendly development strategy implemented in the manufacturing industry is met. The diamond grinding wheel is formed by welding or cold pressing a diamond tool bit on a metal matrix, wherein the diamond tool bit is formed by cold pressing and hot pressing sintering of artificial industrial diamond and other metal powder, and then is welded on the bowl-shaped metal matrix. Diamond-impregnated grinding wheels are typically mounted on concrete sanders to sand concrete, stone or other material wall/floor surfaces, and the like.
The diamond grinding wheel has the advantages that the bonding strength is poor and abrasive particles fall off easily when the diamond tool bit is used for polishing a workpiece in the using process, so that the abrasion resistance of the diamond tool bit is insufficient, and the service life of the diamond grinding wheel is short.
Disclosure of Invention
In order to overcome the defects in the prior art, the embodiment of the invention provides a wear-resistant diamond grinding wheel and a preparation method thereof, and the problems to be solved by the invention are as follows: how to improve the wear resistance of the diamond tool bit and the service life of the diamond grinding wheel.
In order to achieve the above purpose, the present invention provides the following technical solutions: the abrasion-resistant diamond-impregnated wheel comprises a substrate and a tool bit, wherein the tool bit comprises the following raw materials in parts by weight: 25-32 parts of copper, 30-36 parts of iron, 15-24 parts of modified diamond, 2-8 parts of nickel, 5-10 parts of chromium, 1-5 parts of vanadium, 0.5-2 parts of rare earth element and 1-3 parts of composite bonding agent.
In a preferred embodiment, the cutter head comprises the following raw materials in parts by weight: 28-30 parts of copper, 32-34 parts of iron, 18-22 parts of modified diamond, 4-6 parts of nickel, 7-9 parts of chromium, 2-4 parts of vanadium, 1-1.5 parts of rare earth elements and 1.5-2.5 parts of composite bonding agent.
In a preferred embodiment, the cutter head comprises the following raw materials in parts by weight: 30 parts of copper, 32 parts of iron, 20 parts of modified diamond, 5 parts of nickel, 8 parts of chromium, 2 parts of vanadium, 1 part of rare earth element and 2 parts of composite bonding agent.
In a preferred embodiment, the rare earth element is cerium or cerium oxide, the composite binder comprises cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micropowder, and the weight ratio of the cobalt powder to the molybdenum powder to the tungsten powder to the polytetrafluoroethylene micropowder is 1: (0.2-0.6): (0.1-0.5): (0.8-1.2).
In a preferred embodiment, the modified diamond has a particle size of 120-180 mesh and the composite binder has a particle size of 45-55um.
The invention also provides a preparation method of the wear-resistant diamond-impregnated wheel, which comprises the following specific preparation steps:
step one: preparing modified diamond, namely degreasing and coarsening the surfaces of weighed diamond particles, then placing the treated diamond particles into a ceramic crucible, adding titanium hydride powder into the ceramic crucible, fixedly placing the ceramic crucible into a microwave cavity, stirring the diamond particles and the titanium hydride powder by using stirring equipment, processing the interior of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the interior of the microwave cavity to a vacuum degree of 0.1-2Pa, then introducing 2500-3000ml/min of protective gas, continuously for 10-12min, heating the temperature to 600-780 ℃ when introducing the protective gas, preserving heat for 1-2h to obtain sintered mixed powder, cooling the sintered mixed powder with a furnace, grinding and sieving the sintered mixed powder, and washing and drying the sintered mixed powder by using alcohol to obtain the modified diamond;
step two: preparing a composite binding agent, namely weighing raw materials according to the raw material proportion of the composite binding agent, stirring and mixing the weighed raw materials uniformly, then putting the raw materials into an intermediate frequency induction furnace for smelting, smelting each raw material into alloy liquid by using the intermediate frequency induction furnace, and preparing the alloy liquid into composite binding agent powder with the diameter of 45-55 mu m by adopting a conventional high-pressure water atomization method;
step three: preparing a cutter head, namely putting the modified diamond obtained in the first step into a container, adding cresol into the container, wetting the modified diamond by using the cresol, sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and a composite binding agent into the container, stirring and mixing all the raw materials uniformly in the container, slowly putting the uniformly mixed materials into an assembled mold, scraping and pressing the uniformly mixed materials, unloading the mold to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, grinding and trimming the diamond grinding wheel blank after sintering and discharging to obtain the diamond cutter head;
step four: and (3) combining the machine body and the cutter head, namely placing the diamond cutter head obtained in the step (III) on the corresponding position on the substrate, placing a silver-based brazing filler metal sheet between the diamond cutter head and the substrate, and heating and melting the silver-based brazing filler metal sheet at a welding position which is adjusted, so that the diamond cutter head and the abrasive cutting substrate are combined together to form the diamond grinding wheel.
In a preferred embodiment, the step one is to put the diamond particles into a 10wt% NaOH solution to be boiled for 25min under magnetic stirring, then wash the diamond particles with distilled water for 2-3 times, and the roughening treatment is to put the diamond particles after oil removal into a 30wt% nitric acid solution to be boiled for 25min under magnetic stirring, then wash the diamond particles with distilled water for 2-3 times, wherein gamma rays are radiation rays in a space radiation environment with a height of 15-25Km from the ground when using gamma rays to a microwave cavity treatment chamber.
In a preferred embodiment, the temperature of the medium frequency induction furnace in the second step is 1200-1350 ℃.
In a preferred embodiment, the high temperature sintering in the third step is performed by heating to 300-350 ℃ for 20-30min, and then heating to 400-450 ℃ for 10-18min.
In a preferred embodiment, the brazing temperature is 800-825 ℃ and the brazing time is 12-18s in the step four.
The invention has the technical effects and advantages that:
1. the wear-resistant diamond grinding wheel prepared by adopting the raw material formula disclosed by the invention adopts modified diamond as a raw material, the modified diamond is mixed with titanium hydride after degreasing and roughening treatment, then the titanium hydride can be attached to the surface of diamond particles under a vacuum heating condition, the diamond particles are combined with the titanium hydride and are subjected to radiation treatment by utilizing gamma rays, the gamma rays enable the internal defects/color centers of the treated diamond to be distributed more uniformly, the gamma rays have better penetrability, more defects and color centers which are distributed uniformly are formed in the diamond, the titanium hydride can be attached to the surface of the diamond particles better, the consolidation force of the diamond particles attached with titanium is improved, the falling off in the use process of the particles is reduced, nickel, chromium, vanadium and rare earth elements are added into the diamond tool bit, the vanadium and the rare earth elements can refine the grains in the tool bit, the strength and wear resistance of the diamond tool bit are increased, and the rare earth elements can further promote the alloying of a matrix, and the hardness and the anti-changing strength of the diamond tool bit are increased;
2. according to the composite bonding agent, the cobalt powder, the molybdenum powder, the tungsten powder and the polytetrafluoroethylene micro powder are adopted as main bonding agents of diamond, so that the service life of a tool bit is prolonged, the tungsten powder, the molybdenum, the vanadium, the chromium and the nickel are used simultaneously, the wear resistance and the cutting property of the diamond tool bit can be remarkably improved, and the polytetrafluoroethylene micro powder can reduce the friction coefficient of diamond, so that the wear resistance of the diamond tool bit is improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the invention provides a wear-resistant diamond-impregnated wheel, which comprises a substrate and a cutter head, wherein the cutter head comprises the following raw materials in parts by weight: 28 parts of copper, 30 parts of iron, 20 parts of modified diamond, 7 parts of nickel, 8 parts of chromium, 3 parts of vanadium, 1.5 parts of rare earth elements and 2.5 parts of composite bonding agent.
In a preferred embodiment, the rare earth element is cerium or cerium oxide, the composite binder comprises cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micropowder, and the weight ratio of the cobalt powder to the molybdenum powder to the tungsten powder to the polytetrafluoroethylene micropowder is 1:0.4:0.5:1.
in a preferred embodiment, the modified diamond has a particle size of 120-180 mesh and the composite binder has a particle size of 45-55um.
The invention also provides a preparation method of the wear-resistant diamond-impregnated wheel, which comprises the following specific preparation steps:
step one: preparing modified diamond, namely degreasing and coarsening the surfaces of weighed diamond particles, then placing the treated diamond particles into a ceramic crucible, adding titanium hydride powder into the ceramic crucible, fixedly placing the ceramic crucible into a microwave cavity, stirring the diamond particles and the titanium hydride powder by using stirring equipment, processing the interior of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the interior of the microwave cavity to a vacuum degree of 1.5Pa, then introducing 2800ml/min of protective gas, continuously for 12min, heating the temperature to 700 ℃ when the protective gas is introduced, preserving heat for 1.5h to obtain sintered mixed powder, cooling the sintered mixed powder along with a furnace, grinding and sieving the cooled sintered mixed powder, and washing and drying the sintered mixed powder by using alcohol to obtain the modified diamond;
step two: preparing a composite binding agent, namely weighing raw materials according to the raw material proportion of the composite binding agent, stirring and mixing the weighed raw materials uniformly, then putting the raw materials into an intermediate frequency induction furnace for smelting, smelting each raw material into alloy liquid by using the intermediate frequency induction furnace, and preparing the alloy liquid into composite binding agent powder with the diameter of 45-55 mu m by adopting a conventional high-pressure water atomization method;
step three: preparing a cutter head, namely putting the modified diamond obtained in the first step into a container, adding cresol into the container, wetting the modified diamond by using the cresol, sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and a composite binding agent into the container, stirring and mixing all the raw materials uniformly in the container, slowly putting the uniformly mixed materials into an assembled mold, scraping and pressing the uniformly mixed materials, unloading the mold to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, grinding and trimming the diamond grinding wheel blank after sintering and discharging to obtain the diamond cutter head;
step four: and (3) combining the machine body and the cutter head, namely placing the diamond cutter head obtained in the step (III) on the corresponding position on the substrate, placing a silver-based brazing filler metal sheet between the diamond cutter head and the substrate, and heating and melting the silver-based brazing filler metal sheet at a welding position which is adjusted, so that the diamond cutter head and the abrasive cutting substrate are combined together to form the diamond grinding wheel.
In a preferred embodiment, the step one is to put the diamond particles into a 10wt% naoh solution to be boiled for 25min under magnetic stirring, then wash the diamond particles with distilled water for 3 times, and the roughening treatment is to put the diamond particles after oil removal into a 30wt% nitric acid solution to be boiled for 25min under magnetic stirring, then wash the diamond particles with distilled water for 3 times, wherein in the step one, gamma rays are radiation rays in space radiation environment with a height of 20Km from the ground when using gamma rays to treat a microwave cavity.
In a preferred embodiment, the temperature during smelting in the intermediate frequency induction furnace in the second step is 1300 ℃.
In a preferred embodiment, the high temperature sintering in the third step is performed by heating to 330 ℃ for 25min, and then heating to 430 ℃ for 14min.
In a preferred embodiment, the brazing temperature is 820 ℃ and the brazing time is 15s in the step four.
Example 2:
unlike example 1, the cutter head comprises the following raw materials in parts by weight: 30 parts of copper, 32 parts of iron, 20 parts of modified diamond, 5 parts of nickel, 8 parts of chromium, 2 parts of vanadium, 1 part of rare earth element and 2 parts of composite bonding agent.
Example 3:
unlike in examples 1-2, the tool bit comprises the following raw materials in parts by weight: 30 parts of copper, 31 parts of iron, 22 parts of modified diamond, 6 parts of nickel, 6 parts of chromium, 3 parts of vanadium, 1 part of rare earth element and 1 part of composite bonding agent.
Example 4:
the abrasion-resistant diamond-impregnated wheel comprises a substrate and a tool bit, wherein the tool bit comprises the following raw materials in parts by weight: 28 parts of copper, 30 parts of iron, 20 parts of modified diamond, 7 parts of nickel, 8 parts of chromium, 3 parts of vanadium, 1.5 parts of rare earth elements and 2.5 parts of composite bonding agent.
In a preferred embodiment, the rare earth element is cerium or cerium oxide, the composite binder comprises cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micropowder, and the weight ratio of the cobalt powder to the molybdenum powder to the tungsten powder to the polytetrafluoroethylene micropowder is 1:0.3:0.3:0.8.
in a preferred embodiment, the modified diamond has a particle size of 120-180 mesh and the composite binder has a particle size of 45-55um.
The invention also provides a preparation method of the wear-resistant diamond-impregnated wheel, which comprises the following specific preparation steps:
step one: preparing modified diamond, namely degreasing and coarsening the surfaces of weighed diamond particles, then placing the treated diamond particles into a ceramic crucible, adding titanium hydride powder into the ceramic crucible, fixedly placing the ceramic crucible into a microwave cavity, stirring the diamond particles and the titanium hydride powder by using stirring equipment, processing the interior of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the interior of the microwave cavity to a vacuum degree of 1.5Pa, then introducing 2800ml/min of protective gas, continuously for 12min, heating the temperature to 700 ℃ when the protective gas is introduced, preserving heat for 1.5h to obtain sintered mixed powder, cooling the sintered mixed powder along with a furnace, grinding and sieving the cooled sintered mixed powder, and washing and drying the sintered mixed powder by using alcohol to obtain the modified diamond;
step two: preparing a composite binding agent, namely weighing raw materials according to the raw material proportion of the composite binding agent, stirring and mixing the weighed raw materials uniformly, then putting the raw materials into an intermediate frequency induction furnace for smelting, smelting each raw material into alloy liquid by using the intermediate frequency induction furnace, and preparing the alloy liquid into composite binding agent powder with the diameter of 45-55 mu m by adopting a conventional high-pressure water atomization method;
step three: preparing a cutter head, namely putting the modified diamond obtained in the first step into a container, adding cresol into the container, wetting the modified diamond by using the cresol, sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and a composite binding agent into the container, stirring and mixing all the raw materials uniformly in the container, slowly putting the uniformly mixed materials into an assembled mold, scraping and pressing the uniformly mixed materials, unloading the mold to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, grinding and trimming the diamond grinding wheel blank after sintering and discharging to obtain the diamond cutter head;
step four: and (3) combining the machine body and the cutter head, namely placing the diamond cutter head obtained in the step (III) on the corresponding position on the substrate, placing a silver-based brazing filler metal sheet between the diamond cutter head and the substrate, and heating and melting the silver-based brazing filler metal sheet at a welding position which is adjusted, so that the diamond cutter head and the abrasive cutting substrate are combined together to form the diamond grinding wheel.
In a preferred embodiment, the step one is to put the diamond particles into a 10wt% naoh solution to be boiled for 25min under magnetic stirring, then wash the diamond particles with distilled water for 3 times, and the roughening treatment is to put the diamond particles after oil removal into a 30wt% nitric acid solution to be boiled for 25min under magnetic stirring, then wash the diamond particles with distilled water for 3 times, wherein in the step one, gamma rays are radiation rays in space radiation environment with a height of 20Km from the ground when using gamma rays to treat a microwave cavity.
In a preferred embodiment, the temperature during smelting in the intermediate frequency induction furnace in the second step is 1300 ℃.
In a preferred embodiment, the high temperature sintering in the third step is performed by heating to 330 ℃ for 25min, and then heating to 430 ℃ for 14min.
In a preferred embodiment, the brazing temperature is 820 ℃ and the brazing time is 15s in the step four.
Example 5:
unlike example 4, the weight ratio of the cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micropowder is 1:0.6:0.5:1.2.
the abrasion-resistant diamond tips prepared in examples 1 to 5 were used as test groups 1, 2, 3, 4 and 5, respectively, and commercially available diamond tips were selected as control groups for testing, and the selected diamond tips were tested for tensile strength, yield strength, wear rate and abrasive grain removal rate, respectively. The test results are shown in Table I:
list one
As can be seen from the first table, compared with the traditional diamond grinding wheel, the wear-resistant diamond grinding wheel produced by the invention has better wear resistance, tensile strength and yield strength, and the dropping rate of abrasive particles on the diamond grinding wheel cutter head produced by the invention is obviously reduced in the same working time, and the service life of the diamond grinding wheel can be effectively prolonged.
Finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A wear resistant diamond-impregnated wheel comprising a substrate and a cutting head, characterized in that: the cutter head comprises the following raw materials in parts by weight: 25-32 parts of copper, 30-36 parts of iron, 15-24 parts of modified diamond, 2-8 parts of nickel, 5-10 parts of chromium, 1-5 parts of vanadium, 0.5-2 parts of rare earth element and 1-3 parts of composite bonding agent;
the preparation method of the wear-resistant diamond-impregnated wheel comprises the following specific preparation steps:
step one: preparing modified diamond, namely degreasing and coarsening the surfaces of weighed diamond particles, then placing the treated diamond particles into a ceramic crucible, adding titanium hydride powder into the ceramic crucible, fixedly placing the ceramic crucible into a microwave cavity, stirring the diamond particles and the titanium hydride powder by using stirring equipment, processing the interior of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the interior of the microwave cavity to a vacuum degree of 0.1-2Pa, then introducing 2500-3000ml/min of protective gas, continuously for 10-12min, heating the temperature to 600-780 ℃ when introducing the protective gas, preserving heat for 1-2h to obtain sintered mixed powder, cooling the sintered mixed powder with a furnace, grinding and sieving the sintered mixed powder, and washing and drying the sintered mixed powder by using alcohol to obtain the modified diamond;
step two: preparing a composite binding agent, namely weighing raw materials according to the raw material proportion of the composite binding agent, stirring and mixing the weighed raw materials uniformly, then putting the raw materials into an intermediate frequency induction furnace for smelting, smelting each raw material into alloy liquid by using the intermediate frequency induction furnace, and preparing the alloy liquid into composite binding agent powder with the diameter of 45-55 mu m by adopting a conventional high-pressure water atomization method;
step three: preparing a cutter head, namely putting the modified diamond obtained in the first step into a container, adding cresol into the container, wetting the modified diamond by using the cresol, sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and a composite binding agent into the container, stirring and mixing all the raw materials uniformly in the container, slowly putting the uniformly mixed materials into an assembled mold, scraping and pressing the uniformly mixed materials, unloading the mold to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, grinding and trimming the diamond grinding wheel blank after sintering and discharging to obtain the diamond cutter head;
step four: and (3) combining the machine body and the cutter head, namely placing the diamond cutter head obtained in the step (III) on the corresponding position on the substrate, placing a silver-based brazing filler metal sheet between the diamond cutter head and the substrate, and heating and melting the silver-based brazing filler metal sheet at a welding position which is adjusted, so that the diamond cutter head and the abrasive cutting substrate are combined together to form the diamond grinding wheel.
2. A wear resistant diamond grinding wheel according to claim 1, wherein: the cutter head comprises the following raw materials in parts by weight: 28-30 parts of copper, 32-34 parts of iron, 18-22 parts of modified diamond, 4-6 parts of nickel, 7-9 parts of chromium, 2-4 parts of vanadium, 1-1.5 parts of rare earth elements and 1.5-2.5 parts of composite bonding agent.
3. A wear resistant diamond grinding wheel according to claim 1, wherein: the cutter head comprises the following raw materials in parts by weight: 30 parts of copper, 32 parts of iron, 20 parts of modified diamond, 5 parts of nickel, 8 parts of chromium, 2 parts of vanadium, 1 part of rare earth element and 2 parts of composite bonding agent.
4. A wear resistant diamond grinding wheel according to claim 1, wherein: the rare earth element is cerium or cerium oxide, the composite bonding agent comprises cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micro powder, and the weight ratio of the cobalt powder to the molybdenum powder is 1: (0.2-0.6): (0.1-0.5): (0.8-1.2).
5. A wear resistant diamond grinding wheel according to claim 1, wherein: the granularity of the modified diamond is 120-180 meshes, and the granularity of the composite bonding agent is 45-55um.
6. A wear resistant diamond grinding wheel according to claim 1, wherein: the first step is to put diamond particles into a 10wt% NaOH solution to be boiled for 25min under magnetic stirring, then to wash the diamond particles with distilled water for 2-3 times, and the roughening treatment is to put the deoiled diamond particles into a 30wt% nitric acid solution to be boiled for 25min under magnetic stirring, then to wash the diamond particles with distilled water for 2-3 times, wherein gamma rays are radiation rays in a space radiation environment with a height of 15-25Km from the ground when the gamma rays are used for a microwave cavity treatment chamber.
7. A wear resistant diamond grinding wheel according to claim 1, wherein: the temperature in the medium frequency induction furnace in the second step is 1200-1350 ℃.
8. A wear resistant diamond grinding wheel according to claim 1, wherein: and in the third step, the high-temperature sintering is performed by heating to 300-350 ℃ for 20-30min, and then heating to 400-450 ℃ for 10-18min.
9. A wear resistant diamond grinding wheel according to claim 1, wherein: the brazing temperature in the fourth step is 800-825 ℃ and the brazing time is 12-18s.
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