CN107414688B - Rail grinding wheel - Google Patents
Rail grinding wheel Download PDFInfo
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- CN107414688B CN107414688B CN201710728443.6A CN201710728443A CN107414688B CN 107414688 B CN107414688 B CN 107414688B CN 201710728443 A CN201710728443 A CN 201710728443A CN 107414688 B CN107414688 B CN 107414688B
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- grinding wheel
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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
- B24D3/20—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 organic
- B24D3/28—Resins or natural or synthetic macromolecular compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/02—Wheels in one piece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/02—Wheels in one piece
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention relates to a grinding wheel and a preparation method thereof, in particular to a rail grinding wheel and a preparation method thereof, and belongs to the technical field of grinding wheels. The grinding body comprises a base body and a grinding body, wherein the grinding body comprises the following components in parts by weight: grinding materials: 100-110 parts of modified phenolic resin liquid: 5-10 parts of modified phenolic resin powder: 10-15 parts of filler: 25-35 parts. The rail grinding wheel is modified by adopting the nano palygorskite, so that the heat resistance of phenolic resin can be improved, and meanwhile, the nano material is mixed with the high polymer, so that the performances of toughness, strength, high temperature resistance and the like of the polymer material can be improved, and the defect that common rigid particles cannot simultaneously enhance and toughen the rail can be overcome.
Description
Technical Field
The invention relates to a grinding wheel and a preparation method thereof, in particular to a rail grinding wheel and a preparation method thereof, and belongs to the technical field of grinding wheels.
Background
At present, 245 cities with more than 50 million population are provided in China, the medium and long distance passenger flow is large, and 80% of the passenger flow needs to be borne by railways. With the steady and rapid development of national economy and regional economy, people and materials in the whole society are inevitably driven to flow quickly, the passenger and cargo transportation requirement potential is huge, and the quality requirement is increasingly improved. The method has the advantages of accelerating the construction of high-speed railways, improving the railway transportation service capacity and level, and playing an important role in promoting the rapid development of economic society and meeting the increasing passenger transportation requirements. In order to increase the running speed of the rail, a rail grinding locomotive is often adopted for rail grinding, and a grinding wheel used by the rail grinding locomotive is a rail grinding wheel. The rail grinding wheel is a special grinding tool with very high performance requirements, the end face of the grinding wheel is used for vibration grinding during grinding, and the pressure in the vertical direction is regulated and pressurized by hydraulic pressure, so that the load borne by the grinding wheel is very large, and the rail grinding wheel is operated in the open air, so that the grinding wheel is required to have the characteristics of high strength, good wear resistance, high grinding ratio, good weather resistance and the like, particularly, the grinding material used by the grinding wheel has to be compact in structure, good thermal and physical properties, and a bonding agent with high strength and good wear resistance is selected, so that the grinding wheel can bear heavy load and can carry out powerful vibration grinding, and the rail grinding requirements are met.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a rail grinding wheel which has good comprehensive performance and can bear heavy load and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme: the rail grinding wheel comprises a base body and a grinding body, wherein the grinding body comprises the following components in parts by weight: grinding materials: 100-110 parts of modified phenolic resin liquid: 5-10 parts of modified phenolic resin powder: 10-15 parts of filler: 25-35 parts.
The grinding wheel grinding body has the advantages that the components and the parts by weight of the grinding wheel grinding body are reasonably compatible, the manufactured grinding wheel is high in strength, high in hardness, good in elasticity, good in heat resistance and good in self-sharpening performance, can bear heavy-load powerful vibration grinding, is good in efficiency and surface smoothness, a reinforcing mesh sheet for reinforcing the strength of the grinding body does not need to be added in the grinding body, and the requirements of rail grinding are completely met.
In the rail grinding wheel, the grinding material comprises the following components in percentage by weight: semi-brittle corundum: 50-60%, single crystal corundum: 10-15%, silicon carbide: 5-10% and the balance white corundum.
In order to meet the high-strength grinding requirement, the grinding material used by the rail grinding wheel needs to have the requirements of compact structure, high strength, good thermophysical properties, high Mohs hardness and the like. The invention selects a plurality of abrasive materials of semi-brittle corundum, monocrystalline corundum, silicon carbide and white corundum to be mixed for use, combines the respective advantages thereof, and enables the performance of the grinding wheel to reach the optimal state so as to meet the cutting requirement of high strength.
Preferably, the abrasive has a particle size of 14 to 20 mesh. The rail is polished to ensure that the rail is smoother and has better precision, so the granularity of the grinding material is very important. The grinding wheel is preferably provided with the grinding materials with the granularity of 14-20 meshes, and is further preferably provided with the four mixed grinding materials with different granularity values, so that the obtained grinding wheel is high in compactness and high in strength, and the grinding wheel is very good in grinding strength effect.
The modified phenolic resin liquid and the modified phenolic resin powder are used as the binding agent, so that the defect that the traditional resin is limited in the practical application process due to poor high-temperature resistance and low carbonization temperature can be overcome, the modified phenolic resin can eliminate high-risk substances in the resin processing process, the high-temperature resistance of the modified phenolic resin is greatly improved, the central temperature of a grinding area is met, the early carbonization is avoided, the service life of the prepared grinding wheel can be prolonged, and meanwhile, the resin is good in self-extinguishing performance, free of pungent smell and higher in bonding strength than the traditional resin.
In the rail grinding wheel, the particle size of the modified phenolic resin powder is 200-320 meshes.
Preferably, the preparation method of the modified phenolic resin powder comprises the following steps: placing phenolic resin and nano palygorskite with the mass of 1-2% of the phenolic resin on a magnetic force device strong stirrer, and simultaneously performing ultrasonic dispersion at the stirring speed of 1000-1400r/min for 5-6 h. The nano palygorskite particles are uniformly distributed on the polar nodes of the long carbon chain of the matrix resin, and can play roles in filling and reinforcing, increasing bond energy, strengthening interface bonding and reducing free volume in the resin, thereby comprehensively improving the friction performance of the material.
Preferably, the nano palygorskite is pretreated by a silane coupling agent, wherein the silane coupling agent is KH-550. The silane coupling agent is adopted to pretreat the nano palygorskite, so that the interface binding force between the nano particles and the polymer can be increased, the dispersing capacity of the nano particles can be improved, the surface energy state of the particles can be reduced, the surface charge of the particles can be eliminated, the affinity between the particles and an organic phase can be improved, and the surface polarity of the particles can be weakened. Meanwhile, one end of the KH-550 silane coupling agent forms molecular combination with the nano hydroxyl of the solid-phase palygorskite, and the other end is combined with the phenolic resin molecules, so that the organic resin and the inorganic nano palygorskite are fused into a mutually staggered net system, and the performance of the resin is enhanced.
In the rail grinding wheel, the preparation method of the modified phenolic resin liquid comprises the following steps: and (2) fusing the modified phenolic resin powder with ethanol with the mass of 1-3% of the modified phenolic resin powder, and stirring to obtain modified phenolic resin liquid, wherein the stirring speed is 500-600r/min, and the stirring time is 2-3 h.
In the rail grinding wheel, the filler comprises the following components in percentage by weight: thermotropic liquid crystal: 20-30%, graphene oxide: 40-50 percent of nano SiO2。
In the rail grinding wheel, thermotropic liquid crystal is added on the basis of the modified phenolic resin. Thermotropic liquid crystals can form microfibers having a fiber-reinforcing effect. The liquid crystal polymer has excellent performances of liquid crystal and polymer, and has excellent performances of thermal stability, high strength, high modulus, low expansion rate and the like due to the existence of a large number of tightly stacked rigid mesomorphic units. The liquid crystal rigid molecular chains can be aligned under the conditions of flowing, shearing and the like, so that the micro-fibers with high aspect ratio are formed in the polymer. The micro-fibers with the size reaching micron level and high length-diameter ratio form a structure similar to a skeleton reinforcing structure in the composite material, so that the micro-fibers can bear and disperse stress and further play a role in reinforcing. In addition, due to the small size, the bonding area of these microfibers to the matrix resin is much larger than that of the macroscopic fibers, which greatly enhances the force between the two phases.
In addition, a small amount of graphene oxide is added. The graphene carbon material with the laminated structure has excellent self-lubricating property, and as one member of the graphene carbon material, graphene oxide not only has self-lubricating effect, but also has nano-reinforcing effect, but because a large number of hydrophilic functional groups on the surface of the graphene carbon material cause the graphene oxide to have strong hydrophilicity and weak lipophilicity, the dispersibility of the graphene oxide in phenolic resin is reduced; the liquid crystal polymer is a high-performance material with high strength and high modulus, low expansibility and self-enhancement performance, and the liquid crystal polymer is used for modifying graphene oxide, so that the hydrophilicity of the graphene oxide can be reduced, the compatibility of the graphene oxide with phenolic resin is improved, the interface interaction between the graphene oxide and the phenolic resin is enhanced, and the aim of synergistically improving the mechanical property and the friction property of the phenolic resin composite material is fulfilled by utilizing various excellent properties of liquid crystal and the graphene oxide.
Furthermore, nano SiO2The additive can form a chemical bond with a phenolic resin matrix,the interface effect is improved, cracks are not easy to generate during abrasion, the generated fine fragments can be filled into the cracks of the material, and under the rolling action of the grinding wheel, a lamellar structure is gradually formed on the surface, so that the further abrasion of the material can be protected.
Preferably, the particle size of the filler is 200-320 meshes.
The invention also aims to provide a preparation method of the rail grinding wheel, which comprises the following steps:
mixing materials: firstly putting semi-brittle corundum, monocrystalline corundum, silicon carbide and white corundum into modified phenolic resin liquid for soaking, and then putting modified phenolic resin powder, thermotropic liquid crystal, graphene oxide and nano SiO2Uniformly mixing the infiltrated semi-brittle corundum, the infiltrated single crystal corundum, the infiltrated silicon carbide and the white corundum;
sieving: screening raw material particles obtained by mixing through a screen, wherein the particles with the particle size of 14-16 meshes are used as a molding material for molding;
molding: assembling a mould, putting the matrix, weighing a forming material with proper weight, then putting the forming material into the forming mould, flattening the forming material, and performing compression forming to obtain a grinding wheel blank;
hardening: and drying the formed grinding wheel blank in an oven, carrying out gradient temperature rise from room temperature to 190 ℃, then carrying out heat preservation for 4-6 hours, naturally cooling to 50-60 ℃, and discharging to obtain a finished product of the rail grinding wheel.
In the preparation method of the rail grinding wheel, in the forming process, the pressing temperature is 80-90 ℃, the pressing pressure is 20-30N/mm2, and the pressing time is 30-40S. And the pressing temperature is too low or the pressing time is too short, the pressing is insufficient, the performance of the grinding wheel cannot meet the use requirement, and the defective grinding wheel is obtained. Therefore, the invention limits the pressing temperature, pressure and time within the range, and can obtain the rail grinding wheel with optimal performance such as density, strength, hardness and the like after hardening.
In the preparation method of the rail grinding wheel, in the hardening process, the gradient temperature rise is firstly from room temperature to 80 ℃, then the temperature is kept for 1-2h when the temperature is raised from 80 ℃ to 100 ℃ and is increased by 10 ℃ per liter, the temperature is kept for 2-3h when the temperature is raised from 100 ℃ to 120 ℃ and is increased by 10 ℃ per liter, and the temperature is kept for 1-2h when the temperature is raised from 120 ℃ to 175-. Because physical and chemical changes can occur in the hardening process, when the temperature is raised to about 80 ℃, the resin begins to melt, moisture is evaporated, and the hardening reaction begins; when the temperature is increased from 100 ℃ to 120 ℃, the molten resin is crosslinked, and simultaneously releases a large amount of gases such as ammonia gas, water and the like, when the temperature is increased from 130 ℃ to the final temperature of 175-.
Compared with the prior art, the invention has the following advantages:
1. the grinding body of the rail grinding wheel has reasonable particle size compatibility of the grinding material, the phenolic resin powder and the filler, more uniform mixing and better comprehensive performance of the prepared grinding wheel, and rails ground by the grinding wheel are smoother and have better precision.
2. The rail grinding wheel is modified by adopting the nano palygorskite, so that the heat resistance of phenolic resin can be improved, and meanwhile, the nano material is mixed with the high polymer, so that the performances of toughness, strength, high temperature resistance and the like of the polymer material can be improved, and the defect that common rigid particles cannot simultaneously enhance and toughen the rail can be overcome.
3. The preparation process of the rail grinding wheel is simple, convenient and reasonable, has short period, reasonably sets the condition parameters in the forming and hardening process which can meet the performance requirements of the grinding wheel, and prepares the rail grinding wheel with better comprehensive performances such as density, strength, hardness, toughness and the like.
Detailed Description
The invention relates to a rail grinding wheel, which comprises a base body and a grinding body, wherein a through hole is formed in the middle of the base body, a plurality of mounting columns uniformly surrounding the periphery of the through hole are arranged on one end face of the base body, a plurality of connecting columns uniformly surrounding the periphery of the through hole are arranged at the other end of the base body, the base body is fixedly connected with the grinding body through the connecting columns, and glass fiber yarns are wound on the outer side wall of the grinding body.
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Table 1: compositions of grinding bodies of rail grinding wheels in examples 1 to 5
Example 1
Weighing the raw materials according to the components and the parts by weight of the iron rail grinding wheel in the example 1 in the table 1, wherein the particle size of the grinding material in the raw materials is controlled to be 60-80 meshes, the particle size of the modified phenolic resin powder is 200-320 meshes, and the particle size of the filler is 200-320 meshes; then putting the abrasive into the modified phenolic resin liquid for soaking, and then uniformly mixing the modified phenolic resin powder, the filler and the soaked abrasive; screening raw material particles obtained by mixing through a screen, wherein the particles with the particle size of 14-16 meshes are used as a molding material for molding; assembling a mould, putting a substrate, weighing a forming material with proper weight, then putting the forming material into the forming mould, flattening, and performing compression forming to obtain a grinding wheel blank, wherein the compression temperature is 80 ℃, the compression pressure is 20N/mm2, and the compression time is 30S; and drying the formed grinding wheel blank in an oven, raising the temperature in the oven from room temperature to 80 ℃ from room temperature gradient, then keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 80 ℃ to 100 ℃, keeping the temperature for 2h at 10 ℃ per liter when the temperature is raised from 100 ℃ to 120 ℃, keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 120 ℃ to 175 ℃, keeping the temperature for 4 h at 175 ℃, naturally cooling to 50 ℃ and discharging to obtain the finished product of the rail cutting grinding wheel.
Example 2
Weighing the raw materials according to the components and the parts by weight of the iron rail grinding wheel in the example 1 in the table 1, wherein the particle size of the grinding material in the raw materials is controlled to be 60-80 meshes, the particle size of the modified phenolic resin powder is 200-320 meshes, and the particle size of the filler is 200-320 meshes; then putting the abrasive into the modified phenolic resin liquid for soaking, and then uniformly mixing the modified phenolic resin powder, the filler and the soaked abrasive; screening raw material particles obtained by mixing through a screen, wherein the particles with the particle size of 14-16 meshes are used as a molding material for molding; assembling a mould, putting a substrate, weighing a forming material with proper weight, then putting the forming material into the forming mould, flattening, and performing compression forming to obtain a grinding wheel blank, wherein the compression temperature is 82 ℃, the compression pressure is 22N/mm2, and the compression time is 32S; and drying the formed grinding wheel blank in an oven, raising the temperature in the oven from room temperature to 80 ℃ from room temperature gradient, then keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 80 ℃ to 100 ℃, keeping the temperature for 2h at 10 ℃ per liter when the temperature is raised from 100 ℃ to 120 ℃, keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 120 ℃ to 175 ℃, keeping the temperature for 4 h at 175 ℃, naturally cooling to 50 ℃ and discharging to obtain the finished product of the rail cutting grinding wheel.
Example 3
Weighing the raw materials according to the components and the parts by weight of the iron rail grinding wheel in the embodiment 3 shown in the table 1, wherein the particle size of the grinding material in the raw materials is controlled to be 60-80 meshes, the particle size of the modified phenolic resin powder is 200-320 meshes, and the particle size of the filler is 200-320 meshes; then putting the abrasive into the modified phenolic resin liquid for soaking, and then uniformly mixing the modified phenolic resin powder, the filler and the soaked abrasive; screening raw material particles obtained by mixing through a screen, wherein the particles with the particle size of 14-16 meshes are used as a molding material for molding; assembling a mould, putting a substrate, weighing a forming material with proper weight, then putting the forming material into the forming mould, flattening, and performing compression forming to obtain a grinding wheel blank, wherein the compression temperature is 85 ℃, the compression pressure is 25N/mm2, and the compression time is 35S; and drying the formed grinding wheel blank in an oven, raising the temperature in the oven from room temperature to 80 ℃ from room temperature gradient, then keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 80 ℃ to 100 ℃, keeping the temperature for 2h at 10 ℃ per liter when the temperature is raised from 100 ℃ to 120 ℃, keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 120 ℃ to 175 ℃, keeping the temperature for 4 h at 175 ℃, naturally cooling to 50 ℃ and discharging to obtain the finished product of the rail cutting grinding wheel.
Example 4
Weighing the raw materials according to the components and the parts by weight of the iron rail grinding wheel in the embodiment 4 in the table 1, wherein the particle size of the grinding material in the raw materials is controlled to be 60-80 meshes, the particle size of the modified phenolic resin powder is 200-320 meshes, and the particle size of the filler is 200-320 meshes; then putting the abrasive into the modified phenolic resin liquid for soaking, and then uniformly mixing the modified phenolic resin powder, the filler and the soaked abrasive; screening raw material particles obtained by mixing through a screen, wherein the particles with the particle size of 14-16 meshes are used as a molding material for molding; assembling a mould, putting a substrate, weighing a forming material with proper weight, then putting the forming material into the forming mould, flattening, and performing compression forming to obtain a grinding wheel blank, wherein the compression temperature is 87 ℃, the compression pressure is 27N/mm2, and the compression time is 38S; and drying the formed grinding wheel blank in an oven, raising the temperature in the oven from room temperature to 80 ℃ from room temperature gradient, then keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 80 ℃ to 100 ℃, keeping the temperature for 2h at 10 ℃ per liter when the temperature is raised from 100 ℃ to 120 ℃, keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 120 ℃ to 175 ℃, keeping the temperature for 4 h at 175 ℃, naturally cooling to 50 ℃ and discharging to obtain the finished product of the rail cutting grinding wheel.
Example 5
Weighing the raw materials according to the components and the parts by weight of the iron rail grinding wheel in the example 5 in the table 1, wherein the particle size of the grinding material in the raw materials is controlled to be 60-80 meshes, the particle size of the modified phenolic resin powder is 200-320 meshes, and the particle size of the filler is 200-320 meshes; then putting the abrasive into the modified phenolic resin liquid for soaking, and then uniformly mixing the modified phenolic resin powder, the filler and the soaked abrasive; screening raw material particles obtained by mixing through a screen, wherein the particles with the particle size of 14-16 meshes are used as a molding material for molding; assembling a mould, putting a substrate, weighing a forming material with proper weight, then putting the forming material into the forming mould, flattening, and performing compression forming to obtain a grinding wheel blank, wherein the compression temperature is 90 ℃, the compression pressure is 30N/mm2, and the compression time is 40S; and drying the formed grinding wheel blank in an oven, raising the temperature in the oven from room temperature to 80 ℃ from room temperature gradient, then keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 80 ℃ to 100 ℃, keeping the temperature for 2h at 10 ℃ per liter when the temperature is raised from 100 ℃ to 120 ℃, keeping the temperature for 1h at 10 ℃ per liter when the temperature is raised from 120 ℃ to 175 ℃, keeping the temperature for 4 h at 175 ℃, naturally cooling to 50 ℃ and discharging to obtain the finished product of the rail cutting grinding wheel.
Comparative example 1
The difference from the example 1 is that the phenolic resin in the rail grinding wheel of the comparative example is not modified, and the rest is the same as the example 1, and the description is omitted.
Comparative example 1
The difference from the embodiment 1 is that the rail grinding wheel of the comparative example adopts common filler, and the rest is the same as the embodiment 1, and the description is omitted.
Comparative example 2
The difference from the example 1 is that the phenolic resin in the rail grinding wheel of the comparative example is not modified, and the rest is the same as the example 1, and the description is omitted.
Comparative example 3
The difference from example 1 is that the comparative rail grinding wheel filler does not contain thermotropic liquid crystal, and the rest is the same as example 1, and thus the description is omitted.
Comparative example 4
The difference from the example 1 is that the rail grinding wheel filler of the comparative example does not contain graphene oxide, and the rest is the same as the example 1, and the description is omitted.
The performance of the grinding wheel for cutting rails prepared in examples 1 to 5 and comparative examples 1 to 3 was measured, and the results are shown in Table 2.
Table 2: results of testing the performance of the grinding wheel for cutting rails manufactured in examples 1 to 5 and comparative examples 1 to 3
The results of the embodiment and the comparative example show that the grinding body of the grinding wheel for grinding the rail has reasonable particle size compatibility of the grinding material, the phenolic resin powder and the filler, the mixing is more uniform, the comprehensive performance of the prepared grinding wheel is better, and the rail ground by the grinding wheel is smoother and has better precision.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (3)
1. The rail grinding wheel is characterized by comprising a base body and a grinding body, wherein the grinding body comprises the following components in parts by weight: semi-brittle corundum: 58 parts of monocrystalline corundum: 14 parts of silicon carbide: 8 parts, white corundum: 25 parts of modified phenolic resin liquid: 8 parts of modified phenolic resin powder: 12 parts, thermotropic liquid crystal: 9 parts, graphene oxide: 10 parts of nano SiO2: 13 parts;
the preparation method of the modified phenolic resin powder comprises the following steps: placing phenolic resin and nano palygorskite with the mass of 1-2% of the phenolic resin on a magnetic force device strong stirrer, and simultaneously performing ultrasonic dispersion at the stirring speed of 1000-1400r/min for 5-6 h;
the nano palygorskite is pretreated by a silane coupling agent, wherein the silane coupling agent is KH-550.
2. The rail grinding wheel as claimed in claim 1, wherein the modified phenolic resin powder has a particle size of 200-320 mesh.
3. A rail grinding wheel according to claim 1, wherein the method of manufacturing the rail grinding wheel comprises the steps of:
mixing materials: firstly putting semi-brittle corundum, monocrystalline corundum, silicon carbide and white corundum into modified phenolic resin liquid for soaking, and then putting the modified phenolic resin powder and thermotropic liquid crystal,Graphene oxide and nano SiO2Uniformly mixing the infiltrated semi-brittle corundum, the infiltrated single crystal corundum, the infiltrated silicon carbide and the white corundum;
sieving: screening raw material particles obtained by mixing through a screen, wherein the particles with the particle size of 14-16 meshes are used as a molding material for molding;
molding: assembling a mould, putting the matrix, weighing a forming material with proper weight, then putting the forming material into the forming mould, flattening the forming material, and performing compression forming to obtain a grinding wheel blank;
hardening: and drying the formed grinding wheel blank in an oven, carrying out gradient temperature rise from room temperature to 190 ℃ after the temperature in the oven is increased to 180 ℃ and kept for 4-6 hours, and then naturally cooling to 50-60 ℃ for discharging to obtain a finished product of the rail grinding wheel.
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| CN109968221B (en) * | 2017-12-27 | 2021-04-06 | 山东圣泉新材料股份有限公司 | High-strength heavy-load grinding wheel and preparation method thereof |
| CN110666711A (en) * | 2019-08-28 | 2020-01-10 | 鄂州市兴方磨具有限公司 | Integrated sand roller and manufacturing method thereof |
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| 酚醛环氧树脂的改性研究进展;赵蕾，李林洪，李巧玲;《应用化工》;20161031;第45卷(第10期);第1950-1953页 * |
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| CN107414688A (en) | 2017-12-01 |
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