CN113414716A - 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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- CN113414716A CN113414716A CN202110562604.5A CN202110562604A CN113414716A CN 113414716 A CN113414716 A CN 113414716A CN 202110562604 A CN202110562604 A CN 202110562604A CN 113414716 A CN113414716 A CN 113414716A
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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
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- 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
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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
- 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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- 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, and particularly relates to the technical field of diamond-impregnated wheels, wherein the diamond-impregnated wheel comprises a matrix and a tool bit, and the tool bit comprises the following raw materials in parts by weight: copper, iron, modified diamond, nickel, chromium, vanadium, rare earth elements and a composite binder, wherein the composite binder comprises cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micro powder. According to the invention, titanium hydride is better attached to the surface of diamond particles, the consolidation force of the diamond abrasive particles attached with titanium is improved, the falling of the abrasive particles in the using 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 grains inside the tool bit, the strength and the wear resistance of the diamond tool bit are increased, the rare earth elements can further promote the alloying of a matrix, and the hardness and the deformation resistance of the diamond tool bit are increased.
Description
Technical Field
The invention relates to the technical field of diamond grinding wheels, in particular to a wear-resistant diamond grinding wheel and a preparation method thereof.
Background
Diamond is one of the materials with the highest hardness known in the world at present, has the characteristics of high hardness, good wear resistance, high thermal conductivity and the like, and is incomparable with common abrasives. The diamond micropowder is an ideal raw material for grinding and polishing high-hardness non-metallic materials such as stone, ceramics, gems, optical glass and the like. Meanwhile, the diamond micropowder can be artificially synthesized, so that the problem of environmental pollution is solved, and the development strategy of energy conservation and environmental protection promoted in the manufacturing industry of China 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 metal matrix in a bowl shape. Diamond grinding wheels are commonly mounted on concrete grinders to grind concrete, stone or other materials walls/floors, and the like.
The diamond-impregnated wheel use utilizes diamond tool bit poor, the grit drops easily when polishing the work piece bonding strength for diamond tool bit's wear resistance is not enough, and diamond-impregnated wheel's life is lower.
Disclosure of Invention
In order to overcome the above defects in the prior art, embodiments of the present invention provide a wear-resistant diamond-impregnated wheel and a method for manufacturing the same, and the problems to be solved by the present invention are: how to improve the wear resistance of the diamond tool bit and improve the service life of the diamond grinding wheel.
In order to achieve the purpose, the invention provides the following technical scheme: the wear-resistant diamond grinding wheel comprises a base body 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 elements and 1-3 parts of composite binder.
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 binder.
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 binder.
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 micro powder, and the weight ratio of the cobalt powder, the molybdenum powder, the tungsten powder and the polytetrafluoroethylene micro powder is 1: (0.2-0.6): (0.1-0.5): (0.8-1.2).
In a preferred embodiment, the particle size of the modified diamond is 120-180 meshes, and the particle size of the composite binder is 45-55 um.
The invention also provides a preparation method of the wear-resistant diamond-impregnated wheel, which comprises the following specific preparation steps:
the method comprises the following steps: preparing modified diamond, degreasing and roughening the surface of the weighed diamond particles, then putting the diamond particles into a ceramic crucible, adding titanium hydride powder into a ceramic crucible, fixedly placing the ceramic crucible in a microwave cavity, stirring diamond particles and the titanium hydride powder by using stirring equipment, treating the interior of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the interior of the microwave cavity to the vacuum degree of 0.1-2Pa, then 2500-;
step two: preparing a composite binder, namely weighing raw materials according to the raw material proportion of the composite binder, stirring and uniformly mixing the weighed raw materials, putting the raw materials into a medium-frequency induction furnace for smelting, smelting the raw materials into alloy liquid by using the medium-frequency induction furnace, and preparing the alloy liquid into composite binder powder of 45-55 mu m by using a conventional high-pressure water atomization method;
step three: preparing a tool bit, namely putting the modified diamond obtained in the step one into a container, adding cresol into the container, wetting the modified diamond by using the cresol, then sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and composite bonding agent into the container, stirring and uniformly mixing the raw materials in the container, slowly putting the uniformly mixed materials into an assembled die, leveling, pressing and then unloading the die to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, and grinding and finishing after sintering and discharging to obtain the diamond tool bit;
step four: and combining the machine body and the tool bit, namely placing the diamond tool bit obtained in the third step on a corresponding position on the matrix, placing a silver-based brazing filler metal sheet between the diamond tool bit and the matrix, adjusting a welding position, heating and melting the silver-based brazing filler metal sheet, and combining the diamond tool bit and the grinding and cutting matrix together to form the diamond grinding wheel.
In a preferred embodiment, in the step one, the diamond particles are degreased by placing the diamond particles into a 10 wt% NaOH solution and boiling for 25min under magnetic stirring, then the diamond particles are taken out and washed with distilled water for 2-3 times, the coarsening treatment process is that the diamond particles after being degreased are placed into a 30 wt% nitric acid solution and boiling for 25min under magnetic stirring, then the diamond particles are taken out and washed with distilled water for 2-3 times, and the gamma rays in the space radiation environment with the ground clearance of 15-25Km are used for carrying out gamma ray treatment on the microwave cavity treatment chamber in the step one.
In a preferred embodiment, the temperature of the medium frequency induction furnace in the second step is 1200-1350 ℃.
In a preferred embodiment, during the high-temperature sintering in the third step, the mixture is heated to 350 ℃ for 20-30min, and then heated to 450 ℃ for 10-18 min.
In a preferred embodiment, the brazing temperature in the fourth step is 800-825 ℃ and the brazing time is 12-18 s.
The invention has the technical effects and advantages that:
1. the wear-resistant diamond grinding wheel prepared by adopting the raw material formula adopts the modified diamond as the raw material, the modified diamond is subjected to deoiling and coarsening treatment and then is mixed with the titanium hydride, then the titanium hydride can be attached to the surface of the diamond particle under the vacuum heating condition, the radiation treatment is carried out by utilizing the gamma ray when the diamond particle is combined with the titanium hydride, the gamma ray ensures that the internal defects/color centers of the diamond to be treated are more uniformly distributed, and the gamma ray has better penetrating power, so that more uniformly distributed defects and color centers are formed inside the diamond, the titanium hydride can be better attached to the surface of the diamond particle, the consolidation force of the diamond abrasive particles attached with the titanium is improved, the falling of the abrasive particles in the use process is reduced, the nickel, the chromium, the vanadium and the rare earth elements are added into the diamond tool bit, and the vanadium and the rare earth elements can refine grains inside 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 the matrix, and the hardness and the deformation resistance of the diamond tool bit are improved;
2. according to the composite bonding agent, the cobalt powder, the molybdenum powder, the tungsten powder and the polytetrafluoroethylene micro powder are used, the cobalt powder can serve as a main bonding agent of diamond to prolong the service life of the tool bit, the tungsten powder, the molybdenum, the vanadium, the chromium and the nickel are used simultaneously to obviously improve the wear resistance and the machinability of the diamond tool bit, and the polytetrafluoroethylene micro powder can reduce the friction coefficient of the diamond, so that the wear resistance of the diamond tool bit is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a wear-resistant diamond-impregnated wheel which comprises a matrix 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 binder.
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 micro powder, and the weight ratio of the cobalt powder, the molybdenum powder, the tungsten powder and the polytetrafluoroethylene micro powder is 1: 0.4: 0.5: 1.
in a preferred embodiment, the particle size of the modified diamond is 120-180 meshes, and the particle size of the composite binder is 45-55 um.
The invention also provides a preparation method of the wear-resistant diamond-impregnated wheel, which comprises the following specific preparation steps:
the method comprises the following steps: preparing modified diamond, namely degreasing and roughening the surface of weighed diamond particles, then putting the 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, treating the inside of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the inside of the microwave cavity to the vacuum degree of 1.5Pa, introducing 2800ml/min protective gas for 12min, heating the inside of the microwave cavity to 700 ℃ while introducing the protective gas, preserving the temperature for 1.5h to obtain sintered mixed powder, cooling the sintered mixed powder along with a furnace, grinding and sieving the cooled mixed powder, and cleaning and drying the mixed powder by using alcohol to obtain the modified diamond;
step two: preparing a composite binder, namely weighing raw materials according to the raw material proportion of the composite binder, stirring and uniformly mixing the weighed raw materials, putting the raw materials into a medium-frequency induction furnace for smelting, smelting the raw materials into alloy liquid by using the medium-frequency induction furnace, and preparing the alloy liquid into composite binder powder of 45-55 mu m by using a conventional high-pressure water atomization method;
step three: preparing a tool bit, namely putting the modified diamond obtained in the step one into a container, adding cresol into the container, wetting the modified diamond by using the cresol, then sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and composite bonding agent into the container, stirring and uniformly mixing the raw materials in the container, slowly putting the uniformly mixed materials into an assembled die, leveling, pressing and then unloading the die to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, and grinding and finishing after sintering and discharging to obtain the diamond tool bit;
step four: and combining the machine body and the tool bit, namely placing the diamond tool bit obtained in the third step on a corresponding position on the matrix, placing a silver-based brazing filler metal sheet between the diamond tool bit and the matrix, adjusting a welding position, heating and melting the silver-based brazing filler metal sheet, and combining the diamond tool bit and the grinding and cutting matrix together to form the diamond grinding wheel.
In a preferred embodiment, in the step one, the diamond particles are degreased by placing the diamond particles into a 10 wt% NaOH solution and boiling for 25min under magnetic stirring, then the diamond particles are taken out and washed with distilled water for 3 times, and the roughening treatment process comprises placing the degreased diamond particles into a 30 wt% nitric acid solution and boiling for 25min under magnetic stirring, then the diamond particles are taken out and washed with distilled water for 3 times, wherein gamma rays are radiated in a space radiation environment with the ground clearance of 20Km when gamma rays are used for treating the microwave cavity treatment chamber in the step one.
In a preferred embodiment, the temperature of the medium frequency induction furnace in the second step is 1300 ℃.
In a preferred embodiment, the high temperature sintering in the third step is firstly carried out by heating to 330 ℃ and keeping the temperature for 25min, and then heating to 430 ℃ and keeping the temperature for 14 min.
In a preferred embodiment, the brazing temperature in the fourth step is 820 ℃ and the brazing time is 15 s.
Example 2:
different from the embodiment 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 binder.
Example 3:
different from the embodiments 1-2, the cutter head 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 binder.
Example 4:
the wear-resistant diamond grinding wheel comprises a base body 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 binder.
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 micro powder, and the weight ratio of the cobalt powder, the molybdenum powder, the tungsten powder and the polytetrafluoroethylene micro powder is 1: 0.3: 0.3: 0.8.
in a preferred embodiment, the particle size of the modified diamond is 120-180 meshes, and the particle size of the composite binder is 45-55 um.
The invention also provides a preparation method of the wear-resistant diamond-impregnated wheel, which comprises the following specific preparation steps:
the method comprises the following steps: preparing modified diamond, namely degreasing and roughening the surface of weighed diamond particles, then putting the 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, treating the inside of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the inside of the microwave cavity to the vacuum degree of 1.5Pa, introducing 2800ml/min protective gas for 12min, heating the inside of the microwave cavity to 700 ℃ while introducing the protective gas, preserving the temperature for 1.5h to obtain sintered mixed powder, cooling the sintered mixed powder along with a furnace, grinding and sieving the cooled mixed powder, and cleaning and drying the mixed powder by using alcohol to obtain the modified diamond;
step two: preparing a composite binder, namely weighing raw materials according to the raw material proportion of the composite binder, stirring and uniformly mixing the weighed raw materials, putting the raw materials into a medium-frequency induction furnace for smelting, smelting the raw materials into alloy liquid by using the medium-frequency induction furnace, and preparing the alloy liquid into composite binder powder of 45-55 mu m by using a conventional high-pressure water atomization method;
step three: preparing a tool bit, namely putting the modified diamond obtained in the step one into a container, adding cresol into the container, wetting the modified diamond by using the cresol, then sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and composite bonding agent into the container, stirring and uniformly mixing the raw materials in the container, slowly putting the uniformly mixed materials into an assembled die, leveling, pressing and then unloading the die to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, and grinding and finishing after sintering and discharging to obtain the diamond tool bit;
step four: and combining the machine body and the tool bit, namely placing the diamond tool bit obtained in the third step on a corresponding position on the matrix, placing a silver-based brazing filler metal sheet between the diamond tool bit and the matrix, adjusting a welding position, heating and melting the silver-based brazing filler metal sheet, and combining the diamond tool bit and the grinding and cutting matrix together to form the diamond grinding wheel.
In a preferred embodiment, in the step one, the diamond particles are degreased by placing the diamond particles into a 10 wt% NaOH solution and boiling for 25min under magnetic stirring, then the diamond particles are taken out and washed with distilled water for 3 times, and the roughening treatment process comprises placing the degreased diamond particles into a 30 wt% nitric acid solution and boiling for 25min under magnetic stirring, then the diamond particles are taken out and washed with distilled water for 3 times, wherein gamma rays are radiated in a space radiation environment with the ground clearance of 20Km when gamma rays are used for treating the microwave cavity treatment chamber in the step one.
In a preferred embodiment, the temperature of the medium frequency induction furnace in the second step is 1300 ℃.
In a preferred embodiment, the high temperature sintering in the third step is firstly carried out by heating to 330 ℃ and keeping the temperature for 25min, and then heating to 430 ℃ and keeping the temperature for 14 min.
In a preferred embodiment, the brazing temperature in the fourth step is 820 ℃ and the brazing time is 15 s.
Example 5:
different from the embodiment 4, the weight ratio of the cobalt powder, the molybdenum powder, the tungsten powder and the polytetrafluoroethylene micro powder is 1: 0.6: 0.5: 1.2.
the wear-resistant diamond segments obtained in the above examples 1 to 5 were respectively used as an experimental group 1, an experimental group 2, an experimental group 3, an experimental group 4, and an experimental group 5, and commercially available diamond segments were selected as a control group to be tested, and the tensile strength, yield strength, wear rate, and abrasive grain shedding rate of the selected diamond segments were respectively tested. The test results are shown in table one:
watch 1
As can be seen from the table I, 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, the falling rate of the abrasive particles on the diamond grinding wheel tool bit 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, so that the invention adopts the modified diamond as the raw material, the modified diamond is mixed with the titanium hydride after being deoiled and coarsened, then the titanium hydride can be attached to the surface of the diamond particles under the vacuum heating condition, the gamma-ray is utilized for radiation treatment when the diamond particles are combined with the titanium hydride, the gamma-ray ensures that the internal defects/color centers of the treated diamond are more uniformly distributed, and the gamma-ray has better penetrating power, so that more uniformly distributed defects and color centers are formed inside the diamond, and the titanium hydride can be better attached to the surface of the, the consolidation force of the diamond abrasive particles adhered with titanium is improved, the falling of the abrasive particles in the using 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 crystal grains inside 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 deformation resistance of the diamond tool bit are improved.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. A wear-resisting diamond-impregnated wheel, diamond-impregnated wheel including base member and tool bit, its 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 elements and 1-3 parts of composite binder.
2. A wear resistant diamond-impregnated 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 binder.
3. A wear resistant diamond-impregnated 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 binder.
4. A wear resistant diamond-impregnated wheel according to claim 1, wherein: the rare earth element is cerium or cerium oxide, the composite binder comprises cobalt powder, molybdenum powder, tungsten powder and polytetrafluoroethylene micro powder, and the weight ratio of the cobalt powder to the molybdenum powder to the tungsten powder to the polytetrafluoroethylene micro powder is 1: (0.2-0.6): (0.1-0.5): (0.8-1.2).
5. A wear resistant diamond-impregnated wheel according to claim 4, wherein: the particle size of the modified diamond is 120-180 meshes, and the particle size of the composite bonding agent is 45-55 um.
6. The method of making a wear resistant diamond-impregnated wheel according to any one of claims 1 to 5, wherein: the preparation method comprises the following specific steps:
the method comprises the following steps: preparing modified diamond, degreasing and roughening the surface of the weighed diamond particles, then putting the diamond particles into a ceramic crucible, adding titanium hydride powder into a ceramic crucible, fixedly placing the ceramic crucible in a microwave cavity, stirring diamond particles and the titanium hydride powder by using stirring equipment, treating the interior of the microwave cavity by using gamma rays containing protons in the stirring process, vacuumizing the interior of the microwave cavity to the vacuum degree of 0.1-2Pa, then 2500-;
step two: preparing a composite binder, namely weighing raw materials according to the raw material proportion of the composite binder, stirring and uniformly mixing the weighed raw materials, putting the raw materials into a medium-frequency induction furnace for smelting, smelting the raw materials into alloy liquid by using the medium-frequency induction furnace, and preparing the alloy liquid into composite binder powder of 45-55 mu m by using a conventional high-pressure water atomization method;
step three: preparing a tool bit, namely putting the modified diamond obtained in the step one into a container, adding cresol into the container, wetting the modified diamond by using the cresol, then sequentially putting the weighed copper, iron, nickel, chromium vanadium, rare earth elements and composite bonding agent into the container, stirring and uniformly mixing the raw materials in the container, slowly putting the uniformly mixed materials into an assembled die, leveling, pressing and then unloading the die to obtain a diamond grinding wheel blank, putting the diamond grinding wheel blank into a high-temperature sintering furnace for sintering treatment, and grinding and finishing after sintering and discharging to obtain the diamond tool bit;
step four: and combining the machine body and the tool bit, namely placing the diamond tool bit obtained in the third step on a corresponding position on the matrix, placing a silver-based brazing filler metal sheet between the diamond tool bit and the matrix, adjusting a welding position, heating and melting the silver-based brazing filler metal sheet, and combining the diamond tool bit and the grinding and cutting matrix together to form the diamond grinding wheel.
7. The method of making a wear resistant diamond-impregnated wheel according to claim 6, wherein: the method comprises the following steps that in the first step, the diamond particles are placed into a 10 wt% NaOH solution to be magnetically stirred and boiled for 25min, then the diamonds are taken out to be washed with distilled water for 2-3 times, in the coarsening treatment process, the diamond particles after being degreased are placed into a 30 wt% nitric acid solution to be magnetically stirred and boiled for 25min, then the diamonds are taken out to be washed with distilled water for 2-3 times, and in the first step, when the gamma rays are used for the microwave cavity treatment chamber, the gamma rays are the radiation rays in the space radiation environment with the ground clearance of 15-25 Km.
8. The method of making a wear resistant diamond-impregnated wheel according to claim 6, wherein: and the temperature is 1200-1350 ℃ when the medium frequency induction furnace is smelted in the step two.
9. The method of making a wear resistant diamond-impregnated wheel according to claim 6, wherein: during the high-temperature sintering in the third step, the mixture is heated to 350 ℃ for heat preservation for 20-30min, and then heated to 450 ℃ for heat preservation for 10-18 min.
10. The method of making a wear resistant diamond-impregnated wheel according to claim 6, wherein: the brazing temperature in the fourth step is 800-825 ℃ and the brazing time is 12-18 s.
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