CN114536230A - Diamond grinding wheel for TiCN-based metal ceramic machining and preparation method thereof - Google Patents

Diamond grinding wheel for TiCN-based metal ceramic machining and preparation method thereof Download PDF

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Publication number
CN114536230A
CN114536230A CN202210085248.7A CN202210085248A CN114536230A CN 114536230 A CN114536230 A CN 114536230A CN 202210085248 A CN202210085248 A CN 202210085248A CN 114536230 A CN114536230 A CN 114536230A
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grinding wheel
diamond
ticn
particles
diamond grinding
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陈帅鹏
康希越
张乾坤
陈豫章
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Changsha Sharpen Advanced Materials Co ltd
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Changsha Sharpen Advanced Materials Co ltd
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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
    • 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
    • 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
    • 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
    • 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

Abstract

The invention discloses a diamond grinding wheel for TiCN cermet grinding and a preparation method thereof, wherein the diamond grinding wheel consists of a diamond grinding wheel ring and an aluminum substrate, wherein the diamond grinding wheel ring comprises the following raw materials in percentage by mass: diamond particles: 5-15%, copper-tin powder: 70-80%, tin powder: 6-10%, NaCl particles: 3 to 8 percent; the diamond particles are selected from a three-type material or a four-type material, and the particle size of the diamond particles is 30-35 mu m. The diamond grinding wheel provided by the invention has high sharpness and shape retention and high grinding efficiency. The TiCN cermet material has good surface quality after being ground, is not easy to burn, has the surface roughness lower than 0.1 mu m, and the grinding wheel prepared by the method has low cost and good grinding performance, can greatly improve the processing efficiency and reduce the processing cost of the TiCN cermet.

Description

Diamond grinding wheel for TiCN-based metal ceramic machining and preparation method thereof
Technical Field
The invention relates to a diamond grinding wheel for TiCN-based metal ceramic processing and a preparation method thereof, belonging to the field of abrasive tool manufacturing.
Background
TiCN-based cermet is a common hard alloy material, has a series of excellent properties of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, particularly has high hardness and wear resistance, is basically kept unchanged even at the temperature of 500 ℃, and still has high hardness at the temperature of 1000 ℃. TiCN-based cemented carbide is widely used as a tool material, such as turning tools, milling cutters, planing tools, drill bits, boring tools and the like, for cutting cast iron, nonferrous metals, plastics, chemical fibers, graphite, glass, stone and common steel, and can also be used for cutting heat-resistant steel, stainless steel, high manganese steel, tool steel and other materials which are difficult to process. It is the TiCN-based cermet that has high hardness and wear resistance, which makes it very difficult to work with this material. The prior grinding wheel for grinding TiCN-based metal ceramic mainly comprises a ceramic binder diamond grinding wheel and a metal binder diamond grinding wheel, but the effect is not ideal. The ceramic grinding wheel has high sharpness, but the holding force of the binder to the diamond is poor, the diamond falls off quickly, and the grinding wheel has high grinding efficiency, short service life and high cost. The service life of the metal binder diamond grinding wheel for grinding TiCN-based metal ceramic is long, but the holding force of the binder on the diamond is too high, the diamond is not easy to fall off, the sharpness is not enough, the surface quality of a processed material is poor, and burn is easy to occur, so that the grinding wheel is poor in using effect.
Disclosure of Invention
Aiming at the defects of the existing hard alloy grinding technology, the invention aims to provide the diamond grinding wheel for TiCN-based metal ceramic machining and the preparation method thereof. The method for preparing the diamond grinding wheel has the advantages of simple operation, high production efficiency, low cost and large-scale production.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to a diamond grinding wheel for TiCN-based cermet grinding, which consists of a diamond grinding wheel ring and an aluminum substrate, wherein the diamond grinding wheel ring is prepared from the following raw materials in percentage by mass: diamond particles: 5-15%, copper-tin powder: 70-80%, tin powder: 6-10%, NaCl particles: 3 to 8 percent; the diamond particles are selected from a three-type material or a four-type material, and the particle size of the diamond particles is 30-35 mu m.
In the raw materials of the diamond grinding wheel ring, diamond particles are selected from a three-type material or a four-type material, and the grinding wheel prepared from the three-type material or the four-type material with higher strength has good wear resistance and high grinding efficiency. In the invention, the Cu-Sn intermetallic compound is selected as a binder component in the raw material ratio, and the Cu-Sn intermetallic compound has both a metal bond and a covalent bond, so that the prepared grinding wheel has both the high shape retention of a metal grinding wheel and the high sharpness of a ceramic grinding wheel. Better sharpness makes the surface of the processed material more uniform, low roughness and shallower damage layer when processing TiCN-based cermet. A certain amount of NaCl particles are added in the formula as a pore-forming agent, the NaCl particles can be dissolved in grinding fluid to leave holes in the use process of the grinding wheel, on one hand, the holes can play a role in containing chips and removing chips, grinding chips generated in the machining process can be stored in the air holes, the grinding process of the grinding wheel can be smoother, and falling diamonds are stored in the holes, so that the phenomenon that the falling diamonds remain between a sand wheel body and a machined workpiece is avoided, and the abrasive particles roll to cause deeper scratches on the surface of the workpiece. On the other hand, the grinding fluid can enter the holes, so that a better heat dissipation effect can be achieved, and the phenomenon that the TiCN-based metal ceramic surface is burnt due to local overheating in the grinding process is avoided. In addition, the tin powder in the formula can effectively reduce the densification temperature of the grinding wheel, reduce the damage to diamond caused by overhigh pressing temperature, improve the brittleness of the tire body of the grinding wheel and ensure the sharpness of the grinding wheel.
In a preferred scheme, the diamond grinding wheel ring comprises the following raw materials in percentage by mass: diamond particles: 7-9%, copper-tin powder: 74-79%, tin powder: 8-10%, NaCl particles: 5 to 8 percent;
in a preferred embodiment, in the copper-tin powder, by atomic ratio: cu: sn is 1-3: 1.
controlling the atomic ratio of copper to tin in the copper-tin powder within the range, so that the diamond grinding wheel has very good strength, and if the ratio of copper to tin is too high, the liquid phase generation temperature is too high, and the grinding wheel is difficult to compact, so that the strength of the grinding wheel is too low; if the ratio is too low, the ratio of Sn is too high, and the resulting grinding wheel may have insufficient strength.
Preferably, the particle size of the NaCl particle is 100-150 μm.
The NaCl used in the invention has uniform particles and regular shape.
The inventor finds that the particle size of NaCl particles has a certain influence on the performance of the diamond grinding wheel, if the size of the NaCl particles is too large, the mechanical property of the diamond grinding wheel ring is rapidly reduced, and the stability of the diamond grinding wheel ring is reduced due to uneven particle size or irregular shape; if the particle size of NaCl granule is undersize, the abrasive dust and the diamond that drops can't remain in the gas pocket and can't play the effect of holding bits chip removal.
The invention relates to a preparation method of a diamond grinding wheel for TiCN-based cermet grinding processing, which comprises the following steps:
the diamond grinding wheel is prepared by mixing diamond particles, copper tin powder, tin powder and NaCl particles uniformly according to a designed proportion to obtain mixed powder, then adding a forming agent into the mixed powder, granulating to obtain granules, placing the granules into a mould, sintering to obtain the diamond grinding wheel ring, embedding and bonding the diamond grinding wheel ring on an aluminum substrate by using glue, and solidifying to obtain the diamond grinding wheel.
According to the preferable scheme, diamond particles, copper-tin powder, tin powder and NaCl particles are mixed and then sieved by a 80-mesh sieve to obtain undersize materials, and then the undersize materials are placed in a V-shaped mixer for mixing, wherein during mixing, the ball-material ratio is controlled to be 1: 3-5, the rotating speed is 20-25rpm, and the time is 24-36 h.
The inventor finds that after the raw material powder is preliminarily mixed, the undersize is sieved once and then mixed, so that the mixture can be more uniform, and the density of the final material is higher.
Preferably, the forming agent is paraffin, and the addition amount of the paraffin is 5-8w t% of the mass of the mixed powder.
Further preferably, the paraffin is heated to 70-80 ℃ to obtain paraffin liquid, then the paraffin liquid is added into the mixed powder and is uniformly stirred, extruded, sieved and dried to obtain granules.
The drying temperature is 40-50 ℃, and the drying time is more than 2 h.
Preferably, the particle size of the granules is 300-500 μm. The granules are controlled within the range, so that the materials can be well charged, the flowability is good, and the uniformity can be ensured.
Preferably, the sintering is performed in a protective atmosphere, and the sintering process is as follows: the temperature is raised to 350 ℃ for 300 and 90min, and then the temperature is raised to 700 ℃ for 600 and 90 min.
In the actual operation process, the granules are loaded into a graphite mold, protective atmosphere is introduced 1h before opening the furnace, the furnace is washed for three times, and the loaded mold is placed into the furnace.
Preferably, the sintering pressure is 20-30 MPa.
In the invention, the sintering pressure needs to be effectively controlled, the density of the grinding wheel ring is too high due to too high sintering pressure, the grip force of the tire body on the diamond is too large to fall off easily, the sharpness of the grinding wheel is insufficient, and the shape retention of the grinding wheel is affected and the strength is affected due to insufficient pressure due to insufficient density of the grinding wheel ring.
In the preparation method, after the raw materials are granulated and sintered under pressure in a protective atmosphere, the inventor finds that the low-density diamond is not easy to separate from the high-density metal powder after granulation, so that the component segregation is avoided, meanwhile, the granulated particles have better fluidity and more uniform die filling, and finally, the compact diamond grinding wheel is obtained after pressure sintering.
The sintering temperature of the invention is lower, because in the invention, a small amount of tin powder is also added into the raw material of the diamond grinding wheel ring, and the tin powder has the characteristic of low melting point, so that the sintering temperature of the grinding wheel can be reduced, the sintering time can be shortened, the damage of the temperature to diamond can be reduced, the sharpness of the grinding wheel can be improved, and the service life of the grinding wheel can be prolonged.
In the invention, the glue used for inlaying and bonding the diamond grinding wheel ring on the aluminum substrate is AB mixed type epoxy resin glue, and AB mixed type epoxy resin glue produced by 3M company is adopted in the actual operation process.
Principles and advantages
1. In the diamond grinding wheel ring, diamond particles in the raw materials of the diamond grinding wheel ring are selected from a three-type material or a four-type material, and the grinding wheel prepared from the three-type material or the four-type material has high strength and is good in wear resistance and high in grinding efficiency. In the invention, the Cu-Sn intermetallic compound is selected as a binder component in the raw material ratio, and the Cu-Sn intermetallic compound has both a metal bond and a covalent bond, so that the prepared grinding wheel has both the high shape retention of a metal grinding wheel and the high sharpness of a ceramic grinding wheel. Better sharpness makes the surface of the processed material more uniform, low roughness and shallower damage layer when processing TiCN-based cermet.
2. In the preparation process of the diamond grinding wheel, a certain amount of NaCl particles are selected as pore-forming agents, and the NaCl particles are dissolved in grinding fluid to leave holes in the use process of the grinding wheel, so that the holes can play a role in containing chips and removing chips, the grinding process of the grinding wheel is smoother, the fallen diamonds are stored in the holes, and the phenomenon that the fallen diamonds remain between a sand wheel body and a workpiece to be processed and the abrasive particles roll to cause deep scratches on the surface of the workpiece is avoided. On the other hand, the grinding fluid can enter the holes, so that a better heat dissipation effect can be achieved, and the phenomenon that the TiCN-based metal ceramic surface is burnt due to local overheating in the grinding process is avoided.
3. In the preparation process of the novel diamond grinding wheel ring, the inert atmosphere low-pressure sintering condition is adopted, the sintering temperature of the grinding wheel is reduced, the sintering time is shortened, the damage of the temperature to diamond is reduced, the sharpness of the diamond grinding wheel is improved, and the service life of the diamond grinding wheel is prolonged.
4. Compared with the traditional diamond grinding wheel, the grinding wheel provided by the invention has higher porosity, good heat conductivity and moderate holding force of the binder to the diamond, the TiCN cermet material has good surface quality after being ground by the diamond grinding wheel, is not easy to burn, has the surface roughness lower than 0.1 mu m,
5. the grinding wheel prepared by the method has low cost and good grinding performance, and can greatly improve the processing efficiency and reduce the processing cost of TiCN metal ceramic.
Drawings
FIG. 1 microstructure of a diamond wheel according to example 1 of the present invention.
Detailed Description
Example 1
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 80-mesh sieve, undersize materials are taken, and then the undersize materials are mixed in a V-shaped mixer for 24 hours at the speed of 20rpm and the ball material ratio of 1:5, so as to prepare a uniform powder mixture.
Components Diamond particles NaCl particles Copper tin powder Tin powder
Mass percent 8ωt.％ 5ωt.％ 79ωt.％ 8ωt.％
The diamond particles are three-type materials, the average particle size is 30-35 mu m, and the particle size of the NaCl particles is 100-150 mu m;
in the copper-tin powder, the ratio of copper: tin 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. Placing the loaded mould into argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 650 ℃, keeping the temperature for 90min, and reacting, synthesizing and sintering at the sintering pressure of 25 MPa. And cooling to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
The performance of the superhard diamond grinding wheel prepared by the method is tested, and the test result is shown in table 1.
Example 2
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 80-mesh sieve, undersize materials are taken, and then the undersize materials are mixed in a V-shaped mixer for 24 hours at the speed of 20rpm and the ball material ratio of 1:5, so as to prepare a uniform powder mixture.
Components Diamond particles NaCl particles Copper tin powder Tin powder
Mass percent 8ωt.％ 8ωt.％ 76ωt.％ 8ωt.％
The diamond particles are three-type materials, the average particle size is 30-35 mu m, and the particle size of the NaCl particles is 100-150 mu m;
in the copper-tin powder, the ratio of copper: tin is 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. And placing the loaded mould in an argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 650 ℃, keeping the temperature for 90min, and reacting, synthesizing, sintering and cooling under the sintering pressure of 25MPa to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
The performance of the superhard diamond grinding wheel prepared by the method is tested, and the test result is shown in table 1.
Example 3
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 80-mesh sieve, undersize materials are taken, and then the undersize materials are mixed in a V-shaped mixer for 24 hours at the speed of 20rpm and the ball material ratio of 1:5, so as to prepare a uniform powder mixture.
Components Diamond particles NaCl particles Copper tin powder Tin powder
Mass percent 8ωt.％ 8ωt.％ 74ωt.％ 10ωt.％
The diamond particles are three-type materials, the average particle size is 30-35 mu m, and the particle size of the NaCl particles is 100-150 mu m;
in the copper-tin powder, the ratio of copper: tin is 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. Placing the loaded mould into argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 650 ℃, keeping the temperature for 90min, and reacting, synthesizing and sintering at the sintering pressure of 25 MPa. And cooling to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
The performance of the superhard diamond grinding wheel prepared by the method is tested, and the test result is shown in table 1.
Example 4
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 80-mesh sieve, undersize materials are taken, and then the undersize materials are mixed in a V-shaped mixer for 24 hours at the speed of 20rpm and the ball material ratio of 1:5, so as to prepare a uniform powder mixture.
Components Diamond particles NaCl particles Copper tin powder Tin powder
Mass percent 8ωt.％ 8ωt.％ 76ωt.％ 8ωt.％
The diamond particles are three-type materials, the average particle size is 30-35 mu m, and the particle size of the NaCl particles is 100-150 mu m;
in the copper-tin powder, the ratio of copper: tin is 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. Placing the loaded mould into argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 600 ℃ and keeping the temperature for 90min, and reacting, synthesizing and sintering at the sintering pressure of 25 MPa. And cooling to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
The performance of the superhard diamond grinding wheel prepared by the method is tested, and the test result is shown in table 1.
Example 5
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 80-mesh sieve, undersize materials are taken, and then the undersize materials are mixed for 24 hours in a V-shaped mixer at the ball-material ratio of 1:5 and the speed of 20rpm, so as to prepare a uniform powder mixture.
Figure BDA0003487481150000101
Figure BDA0003487481150000111
The diamond particles are three-type materials, the average particle size is 30-35 mu m, and the particle size of the NaCl particles is 100-150 mu m;
in the copper-tin powder, the ratio of copper: tin is 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. And placing the loaded mould in an argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 700 ℃ and keeping the temperature for 90min, and reacting, synthesizing, sintering and cooling under the sintering pressure of 25MPa to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
The performance test of the superhard material diamond grinding wheel prepared by the method is carried out, and the test result is shown in table 1.
Comparative example 1
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 80-mesh sieve, undersize materials are taken, and then the undersize materials are mixed for 24 hours in a V-shaped mixer at the ball-material ratio of 1:5 and the speed of 20rpm, so as to prepare a uniform powder mixture.
Components Diamond particles NaCl particles Copper tin powder Tin powder
Mass percent 8ωt.％ 5ωt.％ 79ωt.％ 8ωt.％
The diamond particles are a type material, the average particle size is 30-35 μm, and the particle size of the NaCl particles is 100-150 μm;
in the copper-tin powder, the ratio of copper: tin is 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. And placing the loaded mould in an argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 550 ℃, keeping the temperature for 90min, and reacting, synthesizing, sintering and cooling under the sintering pressure of 25MPa to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
Comparative example 2
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 80-mesh sieve, undersize materials are taken, and then the undersize materials are mixed for 24 hours in a V-shaped mixer at the ball-material ratio of 1:5 and the speed of 20rpm, so as to prepare a uniform powder mixture.
Components Diamond particles NaCl particles Copper tin powder Tin powder
Mass percent 8ωt.％ 5ωt.％ 79ωt.％ 8ωt.％
The diamond particles are three-type materials, the average particle size is 20-30 μm, and the particle size of the NaCl particles is 100-150 μm;
in the copper-tin powder, the ratio of copper: tin is 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. And placing the loaded mould in an argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 650 ℃, keeping the temperature for 90min, and reacting, synthesizing, sintering and cooling under the sintering pressure of 25MPa to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
Comparative example 3
The implementation process comprises the following steps:
1. the raw materials are proportioned according to the following components, mixed and sieved by a 40-mesh sieve, undersize materials are taken, and then the undersize materials are mixed for 24 hours in a V-shaped mixer at the ball-material ratio of 1:5 and the speed of 20rpm, so as to prepare a uniform powder mixture.
Components Diamond particles NaCl particles Copper tin powder Tin powder
Mass percent 8ωt.％ 5ωt.％ 79ωt.％ 8ωt.％
The diamond particles are three-type materials, the average particle size is 30-35 mu m, and the particle size of the NaCl particles is 200-250 mu m;
in the copper-tin powder, the ratio of copper: tin is 2: 1.
2. adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. And placing the loaded mould in an argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 650 ℃, keeping the temperature for 90min, and reacting, synthesizing, sintering and cooling under the sintering pressure of 25MPa to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
Comparative example 4
The implementation process comprises the following steps:
1. powder mixtures were prepared according to the ratio of the ingredients in the table below and mixed in a V-blender at a ball to feed ratio of 1:5 and 20rpm for 24h to prepare a homogeneous powder mixture.
Components Diamond particles Copper tin powder Tin powder
Mass percent 8ωt.％ 84ωt.％ 8ωt.％
The diamond particles are three types of materials, and the average particle size is 30-35 mu m. In the copper-tin powder, the ratio of copper: tin is 2: 1
2. Adding 6 omega t.% paraffin forming agent into the powder mixture, uniformly stirring, sieving, granulating, and filling into a graphite mold.
3. And placing the loaded mould in an argon atmosphere, keeping the temperature at 300 ℃ for 40min, degassing, degreasing, raising the temperature to 650 ℃, keeping the temperature for 90min, and reacting, synthesizing, sintering and cooling under the sintering pressure of 25MPa to obtain the diamond grinding wheel ring.
4. And flatly grinding the grinding wheel ring to a certain size, inlaying and adhering the grinding wheel ring to an aluminum substrate by using AB type epoxy resin glue, and curing for 24 hours to obtain the diamond grinding wheel.
The obtained diamond grinding wheel was subjected to a performance test, and the test results are shown in table 1.
The mechanical property comparison and the actual processing condition comparison of the embodiment and the comparative example show that the diamond grinding wheel prepared by using the Cu-Sn intermetallic compound as the binder and the NaCl particles as the pore-forming agent has excellent mechanical property, and the processing quality is higher, so that the processing requirement of TiCN-based cermet can be met.
TABLE 1 Properties of diamond grinding wheels prepared in examples and comparative examples
Figure BDA0003487481150000151

Claims (10)

1. A diamond grinding wheel for TiCN-based cermet abrasive machining is characterized in that: the diamond grinding wheel consists of a diamond grinding wheel ring and an aluminum substrate, wherein the diamond grinding wheel ring is prepared from the following raw materials in percentage by mass: diamond particles: 5-15%, copper-tin powder: 70-80%, tin powder: 6-10%, NaCl particles: 3 to 8 percent; the diamond particles are selected from a three-type material or a four-type material, and the particle size of the diamond particles is 30-35 mu m.
2. A diamond wheel for TiCN-based cermet grinding process according to claim 1, wherein: in the copper-tin powder, the atomic ratio is as follows: cu: sn is 1-3: 1.
3. a diamond wheel for TiCN-based cermet grinding process according to claim 1, wherein: the particle size of the NaCl particles is 100-150 mu m.
4. A method of manufacturing a diamond wheel for TiCN-based cermet grinding according to any one of claims 1-3, characterized in that: the method comprises the following steps: the diamond grinding wheel is prepared by mixing diamond particles, copper tin powder, tin powder and NaCl particles uniformly according to a designed proportion to obtain mixed powder, then adding a forming agent into the mixed powder, granulating to obtain granules, placing the granules into a mould, sintering to obtain the diamond grinding wheel ring, embedding and bonding the diamond grinding wheel ring on an aluminum substrate by using glue, and solidifying to obtain the diamond grinding wheel.
5. The method for preparing a diamond grinding wheel for TiCN-based cermet grinding as recited in claim 4, wherein: mixing diamond particles, copper-tin powder, tin powder and NaCl particles, sieving by a 80-mesh sieve, taking undersize, then placing the undersize in a V-shaped mixer for mixing, wherein during mixing, the ball-material ratio is controlled to be 1: 3-5, the rotating speed is 20-25rpm, and the time is 24-36 h.
6. The method for preparing a diamond grinding wheel for TiCN-based cermet grinding as recited in claim 4, wherein: the forming agent is paraffin, and the addition amount of the paraffin is 5-8 wt% of the mass of the mixed powder.
7. The method for preparing a diamond grinding wheel for TiCN-based cermet grinding as recited in claim 6, wherein: heating paraffin to 70-80 deg.C to obtain paraffin solution, adding paraffin solution into the mixed powder, stirring, extruding, sieving, and drying to obtain granule.
8. The method for preparing a diamond grinding wheel for TiCN-based cermet grinding as recited in claim 4, wherein: the particle size of the pellets was 300-500. mu.m.
9. The method for preparing a diamond grinding wheel for TiCN-based cermet grinding as recited in claim 4, wherein: the sintering is carried out under the protective atmosphere, and the sintering process comprises the following steps: the temperature is raised to 350 ℃ for 300 and 90min, and then the temperature is raised to 700 ℃ for 600 and 90 min.
10. The method for preparing a diamond grinding wheel for TiCN-based cermet grinding as recited in claim 4, wherein: the sintering pressure is 20-30 MPa.
CN202210085248.7A 2022-01-25 2022-01-25 Diamond grinding wheel for TiCN-based metal ceramic machining and preparation method thereof Pending CN114536230A (en)

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Application publication date: 20220527