CN114290251B - Fe-based cBN grinding wheel and preparation method thereof - Google Patents
Fe-based cBN grinding wheel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a Fe-based cBN grinding wheel and a preparation method thereof, wherein the preparation method comprises the following steps: mixing the cBN abrasive with an iron-based bonding agent to obtain mixed powder A, mixing the mixed powder A with an auxiliary binder and a pore-forming agent to obtain mixed powder B, carrying out hot press molding on the mixed powder B to obtain a grinding wheel compact, sintering the grinding wheel compact to obtain a grinding wheel blank, and sequentially carrying out quenching treatment and tempering treatment on the grinding wheel blank to obtain the Fe-based cBN grinding wheel. According to the invention, by preferably selecting the iron-based binder and combining the synergistic effect of the processes, the obtained cBN grinding wheel has good high-temperature resistance, the strength is greatly improved, and the grinding wheel also has the advantages of high grinding precision, wide processing range, long service life, low power loss, good economic benefit and the like.
Description
Technical Field
The invention belongs to the field of superhard abrasives, and particularly relates to a Fe-based cBN grinding wheel and a preparation method thereof.
Background
At present, with the increasing requirements of the times on precision machining technology, the grinding machining process adopting the superhard abrasive grinding wheels such as cubic boron nitride (cBN) grinding wheels and the like is widely applied to the rough grinding and the accurate grinding machining of various materials. Meanwhile, the machining process also becomes an indispensable part in realizing precision and ultra-precision machining in the field of modern mechanical manufacturing, and is one of the most basic technologies. The traditional abrasive grinding tools such as silicon carbide, corundum and the like can not meet the current requirements on high-speed, high-efficiency and high-precision grinding. With the development of modern grinding machines, the performance indexes of grinding tools such as grinding wheels used by grinding machines with good performance and higher automation degree become more and more strict.
The superhard grinding materials currently existing and commonly used in the market are mainly based on two major types of abrasives, cubic boron nitride (cBN) and diamond. Cubic boron nitride (cBN) abrasives have a hardness intermediate between that of diamond and silicon carbide. And compared with other abrasives, the cubic boron nitride (cBN) abrasive has good thermal stability, wear resistance, corrosion resistance and the like. cBN grinding wheels also have the following advantages: the grinding tool has the advantages of high chemical stability, wide grinding application range, high grinding precision, good self-sharpening property, capability of being hand-held for grinding, capability of being recycled after being trimmed, long service life and the like. However, the existing superhard grinding wheel on the market has some disadvantages, such as a CN110238766A diamond grinding wheel, which meets the requirement of grinding material on hardness, but has high production cost, and also has poor performance such as fracture, falling off, even material collapse and the like caused by insufficient bonding force between the diamond grinding material and the bonding agent, so that the superhard grinding wheel cannot be widely applied in the market. For example, CN109877719A and CN108818331 metal-based cBN grinding wheel, although the sintering process is improved, so that the material has excellent thermal conductivity, and the temperature of the surface of the ground workpiece can be rapidly reduced, the requirement of processing the material in high-speed grinding cannot be met, and the material does not have high-temperature resistance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the Fe-based cBN grinding wheel and the preparation method thereof, and the prepared Fe-based cBN grinding wheel has excellent strong hardness and high temperature resistance, thereby meeting the requirements of people on the strong hardness and the high temperature resistance of grinding materials in the development of modern machinery and further expanding the application of the Fe-based cBN grinding wheel on high-speed grinding and automatic machinery.
The invention relates to a preparation method of a Fe-based cBN grinding wheel, which comprises the following steps: mixing the cBN abrasive with an iron-based bonding agent to obtain mixed powder A, mixing the mixed powder A with an auxiliary binder and a pore-forming agent to obtain mixed powder B, carrying out hot press molding on the mixed powder B to obtain a grinding wheel compact, sintering the grinding wheel compact to obtain a grinding wheel blank, and sequentially carrying out quenching treatment and tempering treatment on the grinding wheel blank to obtain the Fe-based cBN grinding wheel.
In a preferred scheme, the grain size of the cBN grinding material is less than 200 mu m, and the purity is more than or equal to 99 percent.
Preferably, the iron-based binder is one selected from iron-based binder A, iron-based binder B and iron-based binder C, wherein the iron-based binder A comprises the following components in percentage by mass: 30-60% of Fe powder, 8-35% of Co powder and 15-18% of Mo powder; the iron-based binder B comprises the following components in percentage by mass: 30-60% of Fe powder, 5-28% of W powder and 18-25% of Ni powder; the iron-based binder C comprises the following components in percentage by mass: 30-60% of Fe powder, 8-25% of Ni powder, 8-25% of Co powder, 5-18% of Mo powder and 5-18% of W powder.
Further preferably, the iron-based binder comprises the following components in percentage by mass: 30-60% of Fe powder, 8-25% of Ni powder, 8-25% of Co powder, 5-18% of Mo powder and 5-18% of W powder.
The inventors have found that when an iron-based binder of the above composition is used, the performance of the resulting Fe-based cBN grinding wheel is optimized.
Further preferably, the grain diameters of Fe powder, ni powder, co powder, mo powder and W powder are all less than 200 mu m, and the purity is more than or equal to 99 percent.
Preferably, the cBN abrasive is mixed with the iron-based binder for 0.5 to 1.5 hours to obtain the mixed powder A.
In a preferred embodiment, the auxiliary binder is an acrylic emulsion.
Preferably, the mixed powder A and the auxiliary binder are mixed for 0.5 to 1.5 hours to obtain the mixed powder B.
Preferably, the pore-forming agent is graphite, and the particle size of the graphite is 50-100 μm.
In the invention, graphite is used as a pore-forming agent, and the porosity of the Fe-based cBN grinding wheel is controlled to be between 20 and 30 percent by adding the addition amount of the pore-forming agent and the particle size of the pore-forming agent in cooperation with the particle size of other materials, so that the Fe-based cBN grinding wheel not only has excellent mechanical property, but also can be cooled well and is easy to discharge abrasive dust, if the particle size of the graphite is too large and the porosity of the Fe-based cBN grinding wheel is too large, the mechanical property of the Fe-based cBN grinding wheel is reduced, the porosity of the Fe-based cBN grinding wheel is small, the effect of cooling cannot be achieved, and the abrasive dust cannot be discharged in time.
In a preferred scheme, the mixed powder B comprises the following components in percentage by mass: cBN abrasive: 5-20%, iron-based binder: 40-70%, auxiliary binder: 5-15% of pore-forming agent and 8-15% of pore-forming agent.
Preferably, the mixed powder B is dried at 40-60 ℃ until the mass is 90-95% of that before drying, and then sieved by a 100-mesh sieve for 1-2 times to obtain undersize products, and then the undersize products are subjected to hot press molding.
In a preferred scheme, the pressure of the hot-press molding is 15-30 MPa, the pressure maintaining time is 30-60 min, and the temperature is 1000-1200 ℃.
In actual operation, hot press forming is performed in a circular graphite mold. Further preferably, the hot press molding is performed under the protection of a nitrogen atmosphere.
The inventor finds that the mechanical property of the Fe-based cBN grinding wheel finally obtained is the most excellent by adopting the hot-pressing forming in a short time and then carrying out the vacuum sintering for a period of time.
In a preferred scheme, the sintering is carried out in a vacuum environment, the sintering temperature is 1000-1100 ℃, the sintering time is 4-8h, and the heating rate is 5-15 ℃/min.
Preferably, the quenching process comprises the following steps: preheating the furnace to 700-900 ℃, then putting the grinding wheel into the furnace, heating to 1050-1100 ℃, preserving heat for 0.5-1 h, and then cooling oil to room temperature.
Further preferably, the furnace temperature is preheated to 700-900 ℃ at the speed of 20-30 ℃/min, and then is heated to 1050-1100 ℃ at the speed of 5-10 ℃/min.
In the actual operation process, after the quenching treatment and heat preservation are finished, the oil is rapidly cooled to room temperature, and the oil cooling medium is industrial quenching oil.
In a preferable scheme, the temperature of the tempering treatment is 560-600 ℃, and the heat preservation time is 3-4 h. And after the tempering treatment is finished, air cooling for 3-4 h.
The invention also provides the Fe-based cBN grinding wheel prepared by the preparation method.
The porosity of the Fe-based cBN grinding wheel is 20-30%.
Advantageous effects
The preparation method of the Fe-based cBN grinding wheel adopts the iron-based bonding agent, and the components of the iron-based bonding agent are optimized, so that the prepared grinding wheel not only has better bonding performance, but also has better high temperature resistance, and in addition, the porosity of the Fe-based cBN grinding wheel is controlled to be between 20 and 30 percent by controlling the addition amount of the pore-forming agent and the particle size of the pore-forming agent to be cooperated with the particle size of other materials, at the moment, the Fe-based cBN grinding wheel not only has excellent mechanical property, but also can be cooled well, and is easy to discharge abrasive dust; in the forming process, short-time hot press forming is adopted to cooperate with long-time vacuum sintering, so that elements are fully diffused and sintered compactly, after the final sintering is finished, quenching and tempering heat treatment are added, the quenching treatment is firstly carried out to ensure that the cBN grinding wheel has finer grain size, the tempering treatment can also disperse and distribute precipitated phases in a microstructure of the Fe-based cBN grinding wheel in a matrix, and the strength and hardness of the grinding wheel are obviously improved under the synergistic action of the heat treatment and process parameters. The grinding speed of the grinding wheel can be effectively improved, the energy consumption is reduced, and the application in an automatic grinding machine under high-speed grinding is realized.
In summary, in order to achieve further optimization of the performance of the cBN grinding wheel, the iron-based binder and the auxiliary material binder are preferably selected, and then the further heat treatment strengthening after sintering is combined, so that on one hand, the metal binder can generate solid solution strengthening and grain refinement, and the strength is obviously improved. The holding force of the binding agent on the CBN grinding material is enhanced, so that the service life of the grinding wheel is prolonged, and the processing efficiency of the grinding wheel is improved. On the other hand, the components of the metal bond after heat treatment are more uniform, CBN is uniformly peeled off in the grinding process, the grinding wheel has good self-sharpening property, and the surface quality of the processed material can be effectively improved.
Drawings
Fig. 1 a micrograph of a cBN grinding wheel prepared in example 1.
Detailed Description
The preparation process and performance of the present invention will be further described with reference to specific examples and figures in the examples, and the scope of the present invention is not limited to the following examples
Example 1
The embodiment adopts the following technical scheme:
the Fe-based cBN grinding wheel is prepared by combining the following parts in percentage by mass: cBN abrasive: 15%, metal binder: 67%, auxiliary binder: 10%, pore-forming agent: 8 percent, wherein the total mass percentage sum of the cBN abrasive, the metal bond, the auxiliary binder and the pore-forming agent is 100 percent; the metal bonding agent comprises the following components in percentage by mass: 60% of Fe powder, 25% of Co powder and 15% of Mo powder; the sum of the mass percentages of the Fe powder, the Co powder and the Mo powder is 100 percent; the porosity of the grinding wheel is 20%; the grain sizes of the cBN abrasive, the Fe powder, the Co powder and the Mo powder are all 200 mu m, and the purity is more than or equal to 99 percent; the auxiliary binder is acrylic emulsion. The pore-forming agent is graphite with the particle size of 80 mu m
The basic size of the grinding wheel is 100mm in outer diameter, 80mm in inner diameter and 8mm in thickness.
The preparation method of the Fe-based cBN grinding wheel comprises the following steps:
step 1: preparing a mixed material:
and fully and uniformly mixing the cBN grinding material and the metal bonding agent according to the component proportion of the Fe-based cBN grinding wheel to prepare mixed powder A, and fully and uniformly mixing the mixed powder A, the auxiliary binder and the pore-forming agent to prepare mixed powder B. Then, heating the mixed powder B to 50 ℃, wherein the drying time is 6 hours, and the dried mixed powder B is 95% of the original mixed powder B according to the mass ratio;
step 2: sieving and shaping
Uniformly sieving the dried mixed powder B by a 100-mesh sieve, uniformly stirring and sieving for 2 times; performing graphite hot press molding on the sieved mixed powder B at 1100 ℃, wherein the pressure is 20MPa, and the pressure maintaining time is 60min, so as to prepare a grinding wheel green compact;
and 3, step 3: vacuum sintering
1. Placing the obtained grinding wheel compact in a vacuum sintering furnace, heating to the required sintering temperature of 1100 ℃ at the heating rate of 10 ℃/min, and preserving heat for 6 hours;
2. cooling to room temperature after sintering, and discharging to obtain a grinding wheel green body;
and 4, step 4: quenching and tempering
1. Placing the obtained grinding wheel blank in a muffle furnace for quenching treatment, preheating the furnace temperature to 800 ℃, then heating to 1050 ℃, keeping the temperature for about 1h, and rapidly cooling oil to room temperature, wherein the used quenching oil is industrial quenching oil;
2. then carrying out high-temperature tempering on the quenched grinding wheel blank at the heating temperature of 600 ℃ for 3h, and air-cooling to room temperature;
the superhard material CBN grinding wheel prepared by the method has the porosity of 25 percent,
the performance test was performed, and the test results are shown in table 1.
Example 2
The Fe-based cBN grinding wheel is prepared by combining the following parts in percentage by mass: cBN abrasive: 15%, metal binder: 67%, auxiliary binder: 10%, pore-forming agent: 8 percent, and the total mass percentage sum of the cBN abrasive, the metal bonding agent, the auxiliary binder and the pore-forming agent is 100 percent; the metal bonding agent comprises the following components in percentage by mass: 60% of Fe powder, 15% of W powder and 25% of Ni powder; the sum of the weight percentages of the Fe powder, the W powder and the Ni powder is 100 percent; the porosity of the grinding wheel is 25%; the grain sizes of the cBN abrasive, the Fe powder, the Co powder and the Mo powder are all 200 mu m, and the purity is more than or equal to 99 percent; the auxiliary binder is acrylic emulsion. The pore-forming agent is graphite with the particle size of 80 mu m,
the basic size of the grinding wheel is 100mm in outer diameter, 80mm in inner diameter and 8mm in thickness.
The preparation method of the Fe-based cBN grinding wheel comprises the following steps of:
step 1: preparing a mixed material:
and fully and uniformly mixing the cBN grinding material and the metal bonding agent according to the component proportion of the Fe-based cBN grinding wheel to prepare mixed powder A, and fully and uniformly mixing the mixed powder A, the auxiliary binder and the pore-forming agent to prepare mixed powder B. Then, heating the mixed powder B to 50 ℃, wherein the drying time is 7 hours, and the dried mixed powder B is 93% of the original mixed powder B according to the mass ratio;
step 2: sieving and shaping
Uniformly sieving the dried mixed powder B by a 100-mesh sieve, uniformly stirring and sieving for 2 times; performing graphite hot-press molding on the sieved mixed powder B at 1100 ℃, wherein the pressure is 30MPa, and the pressure maintaining time is 45min, so as to prepare a grinding wheel pressed compact;
and 3, step 3: vacuum sintering
1. Placing the obtained grinding wheel pressed compact in a vacuum sintering furnace, heating to the required sintering temperature of 1100 ℃ at the heating rate of 10 ℃/min, and preserving heat for 5 hours;
2. cooling to room temperature after sintering, and discharging to obtain a grinding wheel blank;
and 4, step 4: quenching and tempering
1. Placing the obtained grinding wheel blank in a muffle furnace for quenching treatment, preheating the furnace temperature to 800 ℃, then heating to 1100 ℃, keeping the temperature for about 0.5h, and rapidly cooling oil to room temperature, wherein the used quenching oil is industrial quenching oil;
2. then carrying out high-temperature tempering on the quenched grinding wheel blank at the heating temperature of 550 ℃ for 4h, and air-cooling to room temperature;
the porosity of the superhard material CBN grinding wheel prepared by the method is 25 percent.
The performance test was performed, and the test results are shown in table 1.
Example 3
The Fe-based cBN grinding wheel is prepared by combining the following parts in percentage by mass: cBN abrasive: 15%, metal binder: 67%, auxiliary binder: 10%, pore-forming agent: 8 percent, and the total mass percentage sum of the cBN abrasive, the metal bonding agent, the auxiliary binder and the pore-forming agent is 100 percent; the metal bonding agent comprises the following components in percentage by mass: fe powder: 50%, co powder: 15%, W powder: 10%, ni powder: 15%, mo powder: 10 percent; the sum of the mass percentages of Fe powder, co powder, W powder, ni powder and Mo powder is 100%; the porosity of the grinding wheel is 25%; the grain diameters of the cBN abrasive, the Fe powder, the Co powder, the W powder, the Ni powder and the Mo powder are all 200 mu m, and the purity is more than or equal to 99 percent; the auxiliary binder is acrylic emulsion. The pore-forming agent is graphite. The particle size of the graphite is 80 μm,
the basic size of the grinding wheel is 100mm in outer diameter, 80mm in inner diameter and 8mm in thickness.
The preparation method of the Fe-based cBN grinding wheel comprises the following steps:
step 1: preparing a mixed material:
fully and uniformly mixing the cBN grinding material and the metal bonding agent according to the component proportion of the Fe-based cBN grinding wheel to prepare mixed powder A, and fully and uniformly mixing the mixed powder A, the auxiliary binder and the pore-forming agent to prepare mixed powder B which is dried and is 92 percent of the original mixed powder B;
and 2, step: sieving and shaping
Uniformly sieving the dried mixed powder B by a 100-mesh sieve, uniformly stirring and sieving for 2 times; carrying out graphite hot-press molding on the sieved mixed powder B at 1100 ℃, wherein the pressure is 30MPa, and the pressure maintaining time is 60min, so as to prepare a grinding wheel pressed compact;
and step 3: vacuum sintering
1. Placing the obtained grinding wheel pressed compact in a vacuum sintering furnace, increasing the temperature to 1050 ℃ of the required sintering temperature at the heating rate of 10 ℃/min, and preserving the temperature for 6h;
2. cooling to room temperature after sintering, and discharging to obtain a grinding wheel blank;
and 4, step 4: quenching and tempering
1. Placing the obtained grinding wheel blank in a muffle furnace for quenching treatment, preheating the furnace temperature to 800 ℃, then heating to 1100 ℃, keeping the temperature for about 0.5h, and rapidly cooling oil to room temperature, wherein the used quenching oil is industrial quenching oil;
2. then carrying out high-temperature tempering on the quenched grinding wheel blank at the heating temperature of 600 ℃ for 4h, and air-cooling to room temperature;
the porosity of the superhard material CBN grinding wheel prepared by the method is as follows: 25 percent.
The performance test was performed, and the test results are shown in table 1.
Comparative example 1
The bronze bonding agent cBN grinding wheel is prepared by combining the following parts in percentage by mass: cBN abrasive: 15%, bronze binding agent: 67%, auxiliary binder: 10%, pore-forming agent: 8 percent, and the total mass percentage sum of the cBN abrasive, the bronze bonding agent, the auxiliary binder and the pore-forming agent is 100 percent; the bronze bonding agent comprises the following components in percentage by mass: 70% of Cu powder, 20% of Sn powder and 10% of other metal powder. The porosity of the grinding wheel is 15%; the grain diameters of the cBN abrasive, the Cu powder and the Sn powder are all 200 mu m, and the purity is more than or equal to 99 percent;
the basic size of the grinding wheel is 100mm in outer diameter, 80mm in inner diameter and 8mm in thickness.
The preparation method of the bronze bonding agent cBN grinding wheel comprises the following steps:
step 1: preparing a mixed material:
the cBN abrasive, the bronze bonding agent, the auxiliary binder and the pore-forming agent are fully and uniformly mixed to prepare mixed powder A,
and 2, step: shaping of
Carrying out graphite hot-press molding on the mixed powder at 800 ℃, wherein the pressure is 20MPa, and the pressure maintaining time is 60min, so as to prepare a grinding wheel pressed compact; and cooling to room temperature after sintering, and discharging to obtain a grinding wheel green body. The superhard material CBN grinding wheel prepared by the method is subjected to performance test, and the test result is shown in Table 1.
Comparative example 2
The technical scheme adopted in the comparative example is as follows:
the Fe-based cBN grinding wheel is prepared by combining the following parts in percentage by mass: cBN abrasive: 15%, metal binder: 67%, auxiliary binder: 10%, pore-forming agent: 8 percent, and the total mass percentage sum of the cBN abrasive, the metal bonding agent, the auxiliary binder and the pore-forming agent is 100 percent; the metal bonding agent comprises the following components in percentage by mass: 60% of Fe powder, 25% of Co powder and 15% of Mo powder; the sum of the mass percentages of Fe powder, co powder and Mo powder is 100%; the porosity of the grinding wheel is 20%; the grain sizes of the cBN abrasive, the Fe powder, the Co powder and the Mo powder are all 200 mu m, and the purity is more than or equal to 99 percent; the auxiliary binder is acrylic emulsion. The pore-forming agent is graphite, the particle size of the graphite is 30 mu m, the basic size of the grinding wheel is 100mm in outer diameter, 80mm in inner diameter and 8mm in thickness.
The preparation method of the Fe-based cBN grinding wheel comprises the following steps:
step 1: preparing a mixed material:
and fully and uniformly mixing the cBN grinding material and the metal bonding agent according to the component proportion of the Fe-based cBN grinding wheel to prepare mixed powder A, and fully and uniformly mixing the mixed powder A, the auxiliary bonding agent and the pore-forming agent to prepare mixed powder B. Then, heating the mixed powder B to 50 ℃, wherein the drying time is 6 hours, and the dried mixed powder B is 95% of the original mixed powder B according to the mass ratio;
and 2, step: sieving and shaping
Uniformly sieving the dried mixed powder B by a 100-mesh sieve, uniformly stirring and sieving for 2 times; carrying out graphite hot-press molding on the sieved mixed powder B at 1100 ℃, wherein the pressure is 20MPa, and the pressure maintaining time is 60min, so as to prepare a grinding wheel pressed compact;
and 3, step 3: vacuum sintering
3. Placing the obtained grinding wheel compact in a vacuum sintering furnace, heating to the required sintering temperature of 1100 ℃ at the heating rate of 10 ℃/min, and preserving heat for 6 hours;
4. cooling to room temperature after sintering, and discharging to obtain a grinding wheel blank;
and 4, step 4: quenching and tempering
3. Placing the obtained grinding wheel blank in a muffle furnace for quenching treatment, preheating the furnace temperature to 800 ℃, then heating to 1050 ℃, keeping the temperature for about 1h, and rapidly cooling oil to room temperature, wherein the used quenching oil is industrial quenching oil;
4. then carrying out high-temperature tempering on the quenched grinding wheel blank at the heating temperature of 600 ℃ for 3h, and air-cooling to room temperature;
the porosity of the superhard material CBN grinding wheel prepared by the method is 17%, and performance test results are shown in Table 1.
TABLE 1 grinding wheel Performance prepared by different Processes and compositions
The principle and the beneficial effects of the invention are as follows:
1. the strength of the grinding wheel prepared by the method exceeds 280MPa, the hardness reaches up to 60HRC, and the bonding agent has higher holding force on the diamond, so the service life of the grinding wheel is long.
2. The grinding wheel prepared by the invention has uniform density, better ground surface quality and improved stability.
3. The CBN superhard grinding wheel can regulate the processing performance through the component proportion and the process parameters, is favorable for reducing the processing and grinding cost of a cutter and improves the production efficiency.
Claims (7)
1. A preparation method of a Fe-based cBN grinding wheel is characterized in that: the method comprises the following steps: mixing the cBN abrasive with an iron-based bonding agent to obtain mixed powder A, mixing the mixed powder A with an auxiliary binder and a pore-forming agent to obtain mixed powder B, carrying out hot press molding on the mixed powder B to obtain a grinding wheel compact, sintering the grinding wheel compact to obtain a grinding wheel blank, and sequentially carrying out quenching treatment and tempering treatment on the grinding wheel blank to obtain the Fe-based cBN grinding wheel;
the quenching treatment process comprises the following steps: preheating the furnace to 700-900 ℃, then putting the grinding wheel into the furnace, heating to 1050-1100 ℃, keeping the temperature for 0.5-1h, and then cooling the oil to the room temperature;
the temperature of tempering treatment is 560 to 600 ℃, the heat preservation time is 3 to 4 hours, and after the tempering treatment is finished, air cooling is carried out for 3 to 4 hours.
2. The method for manufacturing an Fe-based cBN grinding wheel as claimed in claim 1, wherein: the grain size of the cBN abrasive is less than 200 mu m, and the purity is more than or equal to 99%.
3. The method of manufacturing a Fe-based cBN grinding wheel as claimed in claim 1, characterized in that: the iron-based binder is selected from one of an iron-based binder A, an iron-based binder B and an iron-based binder C, wherein the iron-based binder A comprises the following components in percentage by mass: 30 to 60 percent of Fe powder, 8 to 35 percent of Co powder and 15 to 18 percent of Mo powder; the iron-based binder B comprises the following components in percentage by mass: 30 to 60 percent of Fe powder, 5 to 28 percent of W powder and 18 to 25 percent of Ni powder; the iron-based binder C comprises the following components in percentage by mass: 30-60% of Fe powder, 8-25% of Ni powder, 8-25% of Co powder, 5-18% of Mo powder and 5-18% of W powder;
and (3) mixing the cBN abrasive with the iron-based bonding agent for 0.5 to 1.5 hours to obtain mixed powder A.
4. The method of manufacturing a Fe-based cBN grinding wheel as claimed in claim 1, characterized in that: the auxiliary binder is acrylic emulsion;
and mixing the mixed powder A with an auxiliary binder for 0.5 to 1.5 hours to obtain a mixed powder B.
5. The method for manufacturing an Fe-based cBN grinding wheel as claimed in claim 1, wherein: the pore-forming agent is graphite, and the particle size of the graphite is 50 to 100 micrometers;
the mixed powder B comprises the following components in percentage by mass: cBN abrasive: 5 to 20%, iron-based binder: 40 to 70 percent, auxiliary binder: 5 to 15 percent of pore-forming agent and 8 to 15 percent of pore-forming agent.
6. The method of manufacturing a Fe-based cBN grinding wheel as claimed in claim 1, characterized in that: and drying the mixed powder B at 40-60 ℃ until the mass is 90-95% of that before drying, sieving the dried mixed powder B by a 100-mesh sieve for 1-2 times to obtain undersize, and carrying out hot press molding on the undersize.
7. The method of manufacturing a Fe-based cBN grinding wheel as claimed in claim 1, characterized in that: the pressure of the hot-press molding is 15 to 30MPa, the pressure maintaining time is 30 to 60min, and the temperature is 1000 to 1200 ℃;
the sintering is carried out in a vacuum environment, the sintering temperature is 1000-1100 ℃, the sintering time is 4-8h, and the heating rate is 5-15 ℃/min.
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| JP3051486B2 (en) * | 1991-04-02 | 2000-06-12 | 三菱重工業株式会社 | Metal Bond Super Abrasive Whetstone |
| JPH07148729A (en) * | 1993-11-26 | 1995-06-13 | Hitachi Koki Co Ltd | Diamond core bit |
| JP2001030175A (en) * | 1999-07-21 | 2001-02-06 | Asahi Diamond Industrial Co Ltd | Super grinding particle cutter |
| JP2002283244A (en) * | 2001-03-27 | 2002-10-03 | Ando Michihiro | Finishing grinding wheel and method of manufacture |
| JP2014131819A (en) * | 2011-04-18 | 2014-07-17 | Tungaloy Corp | Composite body |
| US11453589B2 (en) * | 2016-10-06 | 2022-09-27 | Sumitomo Electric Industries, Ltd. | Method of producing boron nitride polycrystal, boron nitride polycrystal, cutting tool, wear-resisting tool, and grinding tool |
| CN109877719A (en) * | 2019-04-02 | 2019-06-14 | 东北大学 | A kind of Metal Substrate CBN grinding wheel and its manufacturing method |
| CN111604820A (en) * | 2020-05-27 | 2020-09-01 | 中铁隆昌铁路器材有限公司 | Porous steel rail grinding CBN grinding wheel and preparation method thereof |
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