Resin-based grinding wheel and preparation method and application thereof

Abstract

The invention discloses a resin-based grinding wheel and a preparation method and application thereof, and relates to the technical field of composite materials, and the resin-based grinding wheel is prepared from the following components in parts by weight: 80-120 parts of a grinding material, 20-30 parts of a magnetic binding agent and 3-7 parts of a wetting agent. The magnetic binding agent is added into the resin-based grinding wheel and is matched with the external magnetic field in the using process, on one hand, the magnetic binding agent is collected through the external magnetic field, and on the other hand, a combination formed by the abrasive particles, the wetting agent and the magnetic binding agent is also collected through the external magnetic field; and when an object polished by the resin-based grinding wheel is a material with magnetic response, abrasive dust of the polished object is also collected by the external magnetic field along with the magnetic binding agent, under the comprehensive action, the dust concentration in the environment caused by polishing is reduced, and the safety and environmental friendliness of the resin-based grinding wheel during use are improved.

Description

Technical Field

[0001] This application relates to the field of composite materials technology, and in particular to a resin-based grinding wheel, its preparation method, and its application. Background Technology

[0002] Rail transit serves as the "arteries" for efficient commuting and economic linkage in cities and regions, supporting the daily travel of millions of people and the smooth flow of logistics. Rail grinding eliminates fatigue cracks on the track surface and corrects the geometry of the track surface, making it a core means to ensure smooth train operation, extend track life, and reduce safety risks. During rail grinding operations, the high-speed friction between the grinding wheel and the rail generates a large amount of metal dust and grinding wheel debris, creating significant dust pollution. This dust significantly reduces visibility in the work area, interferes with the operator's vision, and increases the safety risks of mechanical collisions or misjudgments. Long-term inhalation of grinding dust (containing heavy metals, silicates, etc.) may cause occupational diseases such as pneumoconiosis and respiratory inflammation, endangering the health of construction workers. Uncollected dust can spread and pollute the surrounding soil and water bodies, affecting the growth of vegetation along the line and disrupting the local ecological balance.

[0003] Currently, to clean up metal dust and grinding wheel debris generated during grinding, a common method is to apply external negative pressure to suck the particles through a dust collection hood, then through pipes to a screen for filtration and collection. However, firstly, this method involves numerous modules, a complex structure, and occupies a large installation space, making it inconvenient to install and carry; secondly, because the grinding debris and dust contain high-speed, high-temperature flakes, the collection process accelerates the aging and damage of the dust collection hood, pipes, screens, and even the fan, resulting in a short service life; thirdly, the accumulation of debris and dust on the pipes and screens causes a decrease in suction power, crosswinds in the environment, and the small area or orientation of the dust collection hood due to device movement or vibration, all of which contribute to low collection efficiency and fail to address the root cause of the problem. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned related technologies, the purpose of this application is to provide a resin-based grinding wheel, its preparation method and application.

[0005] Firstly, the resin-based grinding wheel provided in this application adopts the following technical solution: A resin-based grinding wheel is made of the following components in parts by weight: 80-120 parts abrasive, 20-30 parts magnetic binder, and 3-7 parts wetting agent.

[0006] Preferably, the magnetic binder is made of the following components in parts by weight: 40-60 parts of binder, 20-30 parts of surface-modified magnetic material and / or magnetic material, and 20-30 parts of additive; wherein the surface-modified magnetic material is obtained by surface modification of magnetic material using a silane coupling agent.

[0007] Preferably, the preparation of the surface-modified magnetic material includes the following steps: mixing magnetic material, ethanol and silane coupling agent, adding distilled water, stirring for 5-15 minutes and then drying to obtain the surface-modified magnetic material.

[0008] Preferably, the weight ratio of the silane coupling agent to the magnetic material is 1:20-30.

[0009] Preferably, the magnetic material includes neodymium iron boron magnetic powder and / or iron tetroxide magnetic powder.

[0010] Preferably, the additive includes one or more of cryolite, calcium oxide, pyrite, and zinc sulfide.

[0011] Preferably, the additives include cryolite and calcium oxide.

[0012] Preferably, the adhesive material includes one or more of phenolic resin, polyimide resin, and epoxy resin.

[0013] Preferably, the wetting agent comprises one or more of liquid phenolic resin, furfural, furfuryl alcohol, and cresol.

[0014] Preferably, the abrasive comprises one or more of brown fused alumina, cerium fused alumina, single-crystal fused alumina, silicon carbide, and cubic boron nitride.

[0015] Preferably, the abrasive comprises brown fused alumina and cerulean fused alumina in a weight ratio of 1:1.1-1.3.

[0016] Preferably, the preparation of the magnetic binder includes the following steps: mixing and ball milling the bonding material, surface-modified magnetic material and additives, controlling the ball-to-material ratio to be 1:1-1.5, the rotation speed to be 200-400 r / min, ball milling clockwise for 10-30 min, and ball milling counterclockwise for 10-30 min to obtain the magnetic binder.

[0017] Secondly, this application provides a method for preparing a resin-based grinding wheel, which adopts the following technical solution: A method for preparing a resin-based grinding wheel includes the following steps: mixing abrasive, magnetic binder and wetting agent evenly to obtain a mixed component; sieving the mixed component and molding it to obtain a grinding wheel to be treated; hot-pressing and sintering the grinding wheel to be treated and then hardening it at high temperature, wherein the temperature of the hot-pressing and sintering and the high-temperature hardening do not exceed 200°C; and cooling to obtain the resin-based grinding wheel.

[0018] Thirdly, this application provides a technical solution for the application of a settling binder in the preparation of resin-based grinding wheels, using the following method: An application of a resin-based grinding wheel in grinding steel rails includes applying a magnetic field to both sides of the steel rail, wherein the resin-based grinding wheel grinds the steel rail within the area covered by the magnetic field.

[0019] In summary, this application includes at least one of the following beneficial technical effects: This invention incorporates a magnetic binder into a resin-based grinding wheel. During use, in conjunction with an external magnetic field, the magnetic binder itself is collected by the external magnetic field, and the aggregate formed by the abrasive grains, wetting agent, and magnetic binder is also collected by the external magnetic field. Furthermore, when the resin-based grinding wheel is grinding a material with magnetic response, the grinding debris from the object is also collected by the external magnetic field along with the magnetic binder. Under these combined effects, the dust concentration in the environment caused by grinding is reduced, improving the safety and environmental friendliness of using resin-based grinding wheels. Attached Figure Description

[0020] Figure 1 This is a comparison graph showing the change of the friction coefficient over time for the resin-based grinding wheels of Examples 1-6 and Comparative Examples 1-2; Figure 2 The dust collection rate is the dust collection rate when the resin-based grinding wheels of Examples 1-6 and Comparative Examples 1-2 are used to grind steel rails under an external magnetic field. Figure 3 This is a scanning electron microscope image of the rail surface after the resin-based grinding wheel grinding test in Example 1; Figure 4 This is a scanning electron microscope image of the rail surface after the resin-based grinding wheel grinding test in Example 2; Figure 5 This is a scanning electron microscope image of the rail surface after the resin-based grinding wheel grinding test in Example 5; Figure 6 This is a scanning electron microscope image of the rail surface after the resin-based grinding wheel grinding test in Example 6; Figure 7 This is a scanning electron microscope image of the dust on the electromagnet after the resin-based grinding wheel test in Example 5. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the embodiments. The following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments were performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention.

[0022] The raw materials used in the examples and comparative examples are all commercially available.

[0023] Example 1 Example 1 of this application provides a resin-based grinding wheel, which is prepared by the following steps: Preparation of magnetic binder: Take 50 parts by weight of phenolic resin, 5 parts by weight of calcium oxide, 17 parts by weight of cryolite and 28 parts by weight of neodymium iron boron magnetic powder and add them into a ball mill containing 80 parts by weight of stainless steel balls. After sealing the ball mill, place it in a ball mill, set the speed to 300 r / min, rotate clockwise for 20 min, and then rotate counterclockwise for 20 min. Separate the stainless steel balls to obtain the magnetic binder.

[0024] Preparation of resin-based grinding wheels: 45 parts by weight of 20-mesh brown fused alumina and 55 parts by weight of 16-mesh zirconium fused alumina were placed in a mixer and thoroughly mixed for 5 minutes to obtain a mixed abrasive. The mixed abrasive and 25 parts by weight of magnetic binder were placed separately in an oven and dried at 60℃ for 24 hours, then stored in a constant temperature and humidity environment for later use. 5 parts by weight of furfural were weighed and added to the mixed abrasive, mixed for 3 minutes, then the magnetic binder was added and mixed for 5 minutes until the overall color was uniform, obtaining a mixed component. The mixed component was passed through a 10-mesh sieve to obtain a loose grinding wheel component. A release agent was applied around the mold, and the mold was placed on the lower mold base. The grinding wheel component was added in three portions according to the required proportion of the grinding wheel, and the abrasive was adjusted after each addition. The wheel components were stirred until the surface was flat, then covered with the upper mold for molding at a pressure of 10 MPa for 30 seconds to obtain the grinding wheel to be treated. The grinding wheel to be treated was hot-pressed and sintered at a pressure of 10 MPa and a temperature of 130°C for 10 minutes, and then placed in a muffle furnace for high-temperature hardening. The system settings were as follows: hold at 50°C for 2 hours, raise the temperature to 100°C at a rate of 50°C / h, hold at 100°C for 1 hour, raise the temperature to 130°C at a rate of 30°C / h, hold at 130°C for 2 hours, raise the temperature to 185°C at a rate of 27.5°C / h, hold at 185°C for 3 hours, and then cool with the furnace to 30°C to obtain the resin-based grinding wheel.

[0025] Example 2 Example 2 of this application provides a resin-based grinding wheel. The difference between Example 2 and Example 1 is that in Example 2, when preparing the magnetic binder, an equal weight of ferric oxide magnetic powder is used to replace neodymium iron boron magnetic powder.

[0026] Example 3 Example 3 of this application provides a resin-based grinding wheel. The difference between Example 3 and Example 1 is that in Example 3, when preparing the magnetic binder, the amount of neodymium iron boron magnetic powder is 22 parts by weight, the amount of calcium oxide is 8 parts by weight, and the amount of cryolite is 20 parts by weight.

[0027] Example 4 Example 4 of this application provides a resin-based grinding wheel. The difference between Example 4 and Example 3 is that in Example 4, when preparing the magnetic binder, an equal weight of ferric oxide magnetic powder is used to replace neodymium iron boron magnetic powder.

[0028] Example 5 Example 5 of this application provides a resin-based grinding wheel. The difference between Example 5 and Example 1 is that in Example 5, an equal weight of surface-modified NdFeB magnetic powder is used to replace the NdFeB magnetic powder when preparing the magnetic binder. The preparation steps of the surface-modified NdFeB magnetic powder are as follows: 50g of NdFeB magnetic powder is added to a beaker, 600mL of ethanol is poured in and stirred evenly for 5min, 2g of silane coupling agent (KH-550) is added dropwise, and then 200mL of distilled water is added. The mixture is stirred thoroughly for 10min, and the beaker is placed in an oven and dried at 80℃ for 1h to obtain surface-modified NdFeB magnetic powder.

[0029] Example 6 Example 6 of this application provides a resin-based grinding wheel. The difference between Example 6 and Example 1 is that in Example 6, an equal weight of surface-modified ferric oxide magnetic powder is used to replace neodymium iron boron magnetic powder when preparing the magnetic binder. The preparation steps of the surface-modified ferric oxide magnetic powder are as follows: 50g of ferric oxide magnetic powder is added to a beaker, 600mL of ethanol is poured in and stirred evenly for 5min, 2g of silane coupling agent (KH-550) is added dropwise, and then 200mL of distilled water is added. The mixture is stirred thoroughly for 10min, and the beaker is placed in an oven and dried at 80℃ for 1h to obtain surface-modified neodymium iron boron magnetic powder.

[0030] Comparative Example 1 Comparative Example 1 of this application provides a resin-based grinding wheel, the preparation steps of which are as follows: Binder preparation: 50 parts by weight of phenolic resin, 5 parts by weight of calcium oxide and 17 parts by weight of cryolite are added to a ball mill containing 80 parts by weight of stainless steel balls. After sealing the ball mill, it is placed in a ball mill, the rotation speed is set to 300 r / min, and it is rotated clockwise for 20 min, followed by counterclockwise rotation for 20 min. The stainless steel balls are then separated to obtain the binder.

[0031] Preparation of resin-based grinding wheels: 45 parts by weight of 20-mesh brown fused alumina and 55 parts by weight of 16-mesh zirconium fused alumina were placed in a mixer and mixed thoroughly for 5 minutes to obtain a mixed abrasive. The mixed abrasive and 18 parts by weight of binder were placed in an oven and dried at 60°C for 24 hours, then stored in a constant temperature and humidity environment for later use. 5 parts by weight of furfural were weighed and added to the mixed abrasive. The mixture was mixed for 3 minutes, then the binder and 7 parts by weight of the surface-modified NdFeB magnetic powder prepared in Example 5 were added and mixed for 5 minutes until the overall color was uniform, obtaining a mixed component. The mixed component was passed through a 10-mesh sieve to obtain a loose grinding wheel component. A release agent was applied around the mold, and the mold was placed on the lower mold base. The grinding wheel was added in 3 portions according to the required ratio. Each time the components are added, the grinding wheel components are stirred until the surface is flat. Then, the upper mold is placed on top for molding at a pressure of 10 MPa for 30 seconds to obtain the grinding wheel to be treated. The grinding wheel to be treated is then hot-pressed and sintered at a pressure of 10 MPa and a temperature of 130°C for 10 minutes. Then, it is placed in a muffle furnace for high-temperature hardening. The system settings are as follows: hold at 50°C for 2 hours, raise the temperature to 100°C at a rate of 50°C / h, hold at 100°C for 1 hour, raise the temperature to 130°C at a rate of 30°C / h, hold at 130°C for 2 hours, raise the temperature to 185°C at a rate of 27.5°C / h, hold at 185°C for 3 hours, and then cool with the furnace to 30°C to obtain the resin-based grinding wheel.

[0032] Comparative Example 2 Comparative Example 2 of this application provides a resin-based grinding wheel. The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, pyrite of equal weight is used to replace neodymium iron boron magnetic powder when preparing the magnetic binder.

[0033] Testing and Inspection (1) The grinding performance of the resin-based grinding wheels of Examples 1-6 and Comparative Examples 1-2 was tested using a small grinding machine, and grinding tests were conducted on U75V steel. A comparison graph showing the change of the friction coefficient of the resin-based grinding wheels of Examples 1-6 and Comparative Examples 1-2 over time was obtained, as shown below. Figure 1 As shown; during the grinding test, two electromagnets were placed 5cm away from the grinding area, energized at 24V for 30s, and then disconnected. Dust was collected from the electromagnets and weighed. The dust collection rate was obtained by dividing the collected dust weight by the total weight loss from the resin-based grinding wheel and the steel rail. The results are shown below. Figure 2 As shown.

[0034] (2) After grinding tests using the resin-based grinding wheels of Examples 1, 2, 5, and 6, samples of the rail surfaces were taken and imaged using scanning electron microscopy. The results are as follows: Figure 3-6 As shown; during the grinding test of the resin-based grinding wheel in Example 5, the dust adsorbed on the electromagnet was imaged using scanning electron microscopy, and the results are as follows. Figure 7 As shown.

[0035] Results Analysis The following detailed description of this application is based on the experimental results provided in the testing and inspection section.

[0036] Reference Figure 1 In Examples 1-4, the resin-based grinding wheel of Example 2 exhibited the highest coefficient of friction and stability when grinding rails. This indicates that neodymium iron boron (NdFeB) magnetic powder, as a magnetic material, is beneficial for improving the friction coefficient and stability of the grinding wheel. The reason for this is that NdFeB magnetic powder has stronger magnetization and remanence than iron oxide (Fe3O4) magnetic powder. During the grinding process, powder containing NdFeB magnetic powder is more easily adsorbed between the rail and the grinding wheel to form a stable adhesive layer, thus improving the friction coefficient and stability. This not only improves grinding efficiency but also reduces wheel wear and extends wheel life. Although Example 1 also uses NdFeB magnetic powder as a magnetic material, the poor compatibility between the surface inertness of NdFeB magnetic powder and the matrix leads to a decrease in the mechanical properties of the grinding wheel when the NdFeB magnetic powder content is too high, resulting in a decrease in the friction coefficient and stability of the resin-based grinding wheel in Example 1. As the resin-based grinding wheels of Examples 5-6 were obtained by surface modification of magnetic powder, the friction coefficient and stability of the resin-based grinding wheel of Example 5 when grinding steel rails were higher than those of the resin-based grinding wheel of Example 6. This indicates that the effect of silane coupling agent on the modification of NdFeB magnetic powder on improving the friction coefficient and friction stability of resin-based grinding wheels is greater than that of silane coupling agent on the modification of Fe3O4 magnetic powder on improving the friction coefficient and friction stability of resin-based grinding wheels, and overcomes the limitation of the amount of NdFeB magnetic powder added in resin-based grinding wheels. The friction coefficient and stability of the resin-based grinding wheel in Example 2 when grinding steel rails were significantly higher than those in Comparative Example 1, indicating that NdFeB magnetic powder significantly improves the friction coefficient and stability of the resin-based grinding wheel compared to pyrite. Similarly, the friction coefficient and stability of the resin-based grinding wheel in Example 5 were higher than those in Comparative Example 2, suggesting that adding surface-modified NdFeB magnetic powder as a magnetic binder to the resin-based grinding wheel is more beneficial than direct addition in improving the friction coefficient and stability of the resin-based grinding wheel when grinding steel rails. This is because ball milling NdFeB magnetic powder, cryolite, phenolic resin, and calcium oxide together to prepare the magnetic binder improves the agglomeration of the NdFeB magnetic powder, increases its uniform distribution in the resin-based grinding wheel, reduces structural defects, and improves mechanical properties.

[0037] Reference Figure 2It can be seen that when the resin-based grinding wheels of Examples 1-4 are used to grind rails in a magnetic field region, the powder collection rate on the electromagnet is highest when using the resin-based grinding wheel of Example 2. However, after modifying the magnetic material, the powder collection rate on the electromagnet is unexpectedly higher when using the resin-based grinding wheel of Example 5 with surface-modified NdFeB magnetic powder than when using the resin-based grinding wheel of Example 6 with surface-modified ferromagnetic powder. This indicates that the effect of silane coupling agent on modifying NdFeB magnetic powder on improving the dust collection rate of the external magnetic field-resin-based grinding wheel-rail system is greater than the effect of silane coupling agent on modifying ferromagnetic powder on improving the dust collection rate of the external magnetic field-resin-based grinding wheel-rail system. Figure 3-6 Analysis: Because neodymium iron boron (NdFeB) magnetic powder has poorer compatibility with the matrix compared to magnetite (Fe3O4) magnetic powder, when grinding steel rails using the resin-based grinding wheels of Examples 1-2, a large amount of NdFeB magnetic powder, which is not combined with other components, falls off. Furthermore, due to the high remanence of NdFeB magnetic powder, [further issues arise]. Figure 3 As shown, it is adsorbed on the surface of the rail, and the remanence of iron(III) oxide is weak, so... Figure 4 The steel rail surface shown in the diagram has almost no adsorption, resulting in a lower collection rate of NdFeB magnetic powder compared to Fe3O4. This further leads to a decrease in the collection rate of other components as the NdFeB magnetic powder is attracted by the electromagnet. However, with the resin-based grinding wheel in Example 5 using surface-modified NdFeB magnetic powder, such as... Figure 5 The amount of adsorbed material on the rail shown is significantly reduced. The bonding effect between the surface-modified NdFeB magnetic powder and other components is improved. The coating of the surface-modified NdFeB magnetic powder by other components not only prevents direct contact between the NdFeB magnetic powder and the rail, reducing the magnetic force between the NdFeB magnetic powder and the rail, but also increases the difficulty of adsorbing dust containing NdFeB magnetic powder and other components onto the rail. Furthermore, under the action of a magnetic field, other components in the resin-based grinding wheel are collected by the electromagnet along with the surface-modified NdFeB magnetic powder, increasing the dust collection rate to a level higher than that when using the resin-based grinding wheel of Example 6. When using the resin-based grinding wheel of Example 6, the rail surface is as... Figure 6 The result shows that there is still virtually no adsorption.

[0038] Reference Figure 2When grinding rails with resin-based grinding wheels from Examples 1, 2, and 2 under an applied magnetic field, the dust collection rate on the electromagnet was significantly higher with the resin-based grinding wheels from Examples 1 and 2 than with the resin-based grinding wheel from Comparative Example 2. This indicates that the addition of neodymium iron boron (NdFeB) magnetic powder and magnetite (Fe3O4) magnetic powder to the resin-based grinding wheel, combined with the external magnetic field, is beneficial for improving the dust collection rate. However, when grinding rails with resin-based grinding wheels from Examples 5 and 1 under an applied magnetic field, the dust collection rate on the electromagnet was nearly 14% higher with the resin-based grinding wheel from Example 5 than with the resin-based grinding wheel from Comparative Example 1. This is attributed to two factors: firstly, the improved mechanical properties of the resin-based grinding wheel help suppress the individual shedding of NdFeB magnetic powder, thus increasing the collection rate. On the other hand, improving the uniformity of the distribution of NdFeB magnetic powder, cryolite, and calcium oxide is beneficial to the heat absorption and cooling characteristics of cryolite and calcium oxide, delaying the temperature rise of NdFeB magnetic powder during polishing, suppressing the weakening of magnetism caused by temperature rise, and improving the collection rate of the electromagnet for the surface-modified NdFeB magnetic powder-other component complex. For example... Figure 7 The image shows the morphology of dust collected on the electromagnet when using the resin-based grinding wheel of Example 5. It indicates that the dust appears in agglomerated form, without individual phenolic resin blocks, cryolite blocks, or calcium oxide blocks. Furthermore, a black mixed material is clearly observed covering the surface of the abrasive grains in the aggregate, and metallic steel chips are also adsorbed on it. This indicates the presence of magnetic material between the steel chips and the abrasive grains, which corroborates that the surface-modified NdFeB magnetic powder, abrasive grains, phenolic resin, cryolite, and calcium oxide adsorb steel chips in a complex aggregate form and are collected by the electromagnet.

[0039] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A resin-based grinding wheel, characterized in that: It is made from the following components in parts by weight: 80-120 parts abrasive, 20-30 parts magnetic binder, and 3-7 parts wetting agent.

2. The resin-based grinding wheel according to claim 1, characterized in that: The magnetic binder is made of the following components in parts by weight: 40-60 parts of binder material, 20-30 parts of surface-modified magnetic material and / or magnetic material, and 20-30 parts of additive; the surface-modified magnetic material is obtained by surface modification of magnetic material using a silane coupling agent.

3. The resin-based grinding wheel according to claim 2, characterized in that: The preparation of the surface-modified magnetic material includes the following steps: The magnetic material, ethanol, and silane coupling agent are mixed and then distilled water is added. After stirring for 5-15 minutes, the mixture is dried to obtain the surface-modified magnetic material.

4. The resin-based grinding wheel according to claim 2, characterized in that: The weight ratio of the silane coupling agent to the magnetic material is 1:20-30.

5. A resin-based grinding wheel according to claim 2, characterized in that: The magnetic material includes neodymium iron boron magnetic powder and / or iron tetroxide magnetic powder.

6. A resin-based grinding wheel according to claim 2, characterized in that: The additives include one or more of cryolite, calcium oxide, pyrite, and zinc sulfide.

7. A resin-based grinding wheel according to claim 2, characterized in that: The bonding material includes one or more of phenolic resin, polyimide resin, and epoxy resin.

8. A resin-based grinding wheel according to claim 2, characterized in that: The preparation of the magnetic binder includes the following steps: The binder, surface-modified magnetic material, and additives are mixed and ball-milled, with the ball-to-material ratio controlled at 1:1-1.5 and the rotation speed at 200-400 r / min. The mixture is ball-milled clockwise for 10-30 min and counterclockwise for 10-30 min to obtain the magnetic binder.

9. A method for preparing a resin-based grinding wheel as described in any one of claims 1-8, characterized in that: Includes the following steps: Abrasive, magnetic binder and wetting agent are mixed evenly to obtain a mixed component. The mixed component is then sieved and molded to obtain a grinding wheel to be treated. The grinding wheel to be treated is subjected to hot pressing and sintering, followed by high-temperature hardening. The temperature of the hot pressing and sintering and the high-temperature hardening do not exceed 200°C. After cooling, the resin-based grinding wheel is obtained.

10. The application of a resin-based grinding wheel as described in any one of claims 1-8 in grinding steel rails, characterized in that: The method includes applying a magnetic field to both sides of the rail, and the resin-based grinding wheel grinding the rail within the area covered by the magnetic field.

Images