Resin grinding wheel and manufacturing method thereof

Abstract

The invention discloses a resin grinding wheel and a manufacturing method thereof. The invention discloses a resin grinding wheel, which belongs to the technical field of grinding wheels and is prepared from the following raw materials in parts by mass: 55 to 75 parts of grinding material, 5 to 10 parts of phenolic resin powder, 20 to 35 parts of filler, 1 to 8 parts of impregnant, 0 to 0.3 part of enhancer A, 1 to 2 parts of enhancer B and 1 to 5 parts of wetting agent. The impregnant is formed by mixing 0.55 to 4.5 parts of ethylene glycol and 0.45 to 3.5 parts of a silane coupling agent. The impregnant can be completely spread and coated on the surfaces of grinding materials and powder materials or permeate into air holes, gullies and gaps of the materials, the surface state and surface chemical properties of the materials are changed, the impregnant and the phenolic resin powder are good in compatibility, part of the phenolic resin powder is dissolved by the impregnant when the impregnant and the phenolic resin powder are mixed, and the mechanical property of the materials is improved. The impregnant can introduce the resin component into the microscopic surface of the material, so that the coating performance of the resin and the material is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of grinding wheels, and in particular to a resin grinding wheel and a manufacturing method thereof. Background Art

[0002] Resin grinding wheel is a kind of efficient and precise grinding tool, which is widely used in metal processing, machinery manufacturing, automobile manufacturing, aerospace and other fields, providing important technical support for industrial production.

[0003] Resin grinding wheels are mainly composed of resin binder, abrasive particles and possible fillers. The abrasive particles of resin grinding wheels are usually made of high-hardness materials, such as white corundum, brown corundum, silicon carbide, etc. These abrasive particles are evenly distributed on the surface of the grinding wheel to form a sharp cutting edge. As a binder, resin has bonding properties and a certain elasticity, which can combine the abrasive particles together to form a grinding wheel structure with a certain hardness and strength. During the grinding process, the abrasive particles contact and generate friction with the surface of the workpiece, and through continuous cutting and wear, the surface of the workpiece is ground, polished or cut.

[0004] When resin grinding wheels are manufactured, due to the natural characteristics of abrasives and powder fillers such as pores, grooves, cracks on the surface, some materials have poor adhesion to resin. The existence of these characteristics has a negative effect on the overall performance of the grinding wheel, making it difficult for the resin grinding wheel to achieve the desired effect when used. Summary of the invention

[0005] The embodiment of the present application provides a resin grinding wheel to solve the technical problem of poor grinding wheel performance caused by poor adhesion between abrasives, powders and resins.

[0006] The first aspect of the present application provides a resin grinding wheel, characterized in that it is made of raw materials including the following components, by mass: 55-75 parts of abrasive, 5-10 parts of phenolic resin powder, 20-35 parts of filler, 1-8 parts of impregnating agent, 0-0.3 parts of reinforcing agent A, 1-2 parts of reinforcing agent B, and 1-5 parts of wetting agent; The impregnating agent is prepared by mixing 0.55-4.5 parts of ethylene glycol and 0.45-3.5 parts of silane coupling agent.

[0007] Through the above technical solution, the present invention achieves the following beneficial effects: (1) The impregnating agent can be completely spread on the surface of the abrasive and powder material or penetrate into the pores, grooves, and gaps of the material, changing the surface state and surface chemical properties of the material; (2) The impregnating agent has good compatibility with the phenolic resin powder. When the two are mixed, the impregnating agent dissolves part of the phenolic resin powder. The impregnating agent can introduce the resin component into the microscopic surface of the material, enhance the coating performance of the resin and the material, and prevent the material from lacking glue on the surface, so that the material and the resin can be seamlessly connected during hot pressing; (3) The material coated by the new mixed solution is well dispersed in the grinding wheel structure, and there will be no agglomeration or aggregation, which will cause an imbalance in the bonding force between the material and the resin, thus ensuring the uniformity of the grinding wheel structure; (4) The coated material has lubricating properties, making the grinding wheel easier to process during hot pressing; (5) The impregnating agent is non-irritating to the human body and is environmentally friendly.

[0008] Based on the above embodiments, the embodiments of the present application may also be improved as follows: In one of the embodiments of the present application: the abrasive comprises the following component raw materials: 33-45 parts of zirconium corundum, 20-27 parts of brown corundum, and 2-3 parts of white corundum.

[0009] In one of the embodiments of the present application: the filler includes the following component raw materials: 11-16 parts of iron sulfide, 4-6 parts of black silicon carbide, 1-2 parts of iron oxide, 2-3 parts of calcium oxide, and 2-3 parts of cryolite.

[0010] In one of the embodiments of the present application: the enhancer A is aluminum dihydrogen phosphate.

[0011] In one of the embodiments of the present application: the reinforcing agent B is glass fiber.

[0012] In one of the embodiments of the present application: the wetting agent is dibutyl ester.

[0013] The second aspect of the present application provides a method for manufacturing a resin grinding wheel, comprising the following steps: (1) mixing the reinforcing agent A with the phenolic resin powder; (2) mixing the impregnating agent with the abrasive; (3) mixing the impregnating agent with the filler; (4) mixing the mixture in step (3) with the mixture in step (2); (5) mixing the mixture in step (1) with the mixture in step (4); (6) mixing the wetting agent with the mixed material in step (5); (7) mixing the reinforcing agent B with the mixed material in step (6) to obtain a molding material; (8) adding the molding material into a mold and hot pressing to form a grinding wheel blank; (9) The grinding wheel blank is hardened and then processed into a shape.

[0014] Through the above technical solution, the present invention achieves the following beneficial effects: (1) The present invention uses ethylene glycol as an impregnating agent for abrasives and powder fillers to treat their surfaces. Ethylene glycol has low viscosity and good fluidity, and is easy to penetrate into the tiny pores, grooves, and gaps on the surface of the material, and forms a thin film on the surface of the abrasive and filler. The phenolic resin in contact with it is also partially infiltrated. During hot pressing, the resin easily penetrates into the interior of the abrasive and powder filler, so that they form a seamless connection with each other and become one with each other. These changes in microstructure improve the strength of the grinding wheel and the holding force of the abrasive in the grinding wheel structure; (2) During mixing, a glycol film is formed on the surface of the abrasive and powder filler, which increases the lubricity of the material and enhances the dispersibility of the granular material, making them more evenly dispersed, less likely to agglomerate, and thus improving the stability of the material; (3) During hot pressing, due to the further effect of high temperature, ethylene glycol and phenolic resin melt rapidly, which increases the fluidity of various materials in the grinding wheel structure and facilitates molding, thus ensuring the uniformity and density of the grinding wheel structure; (4) During hardening, ethylene glycol and phenolic resin react to form a cross-linked structure, which improves the strength, hardness and heat resistance of the grinding wheel. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention is described in detail below in conjunction with the examples. It should be understood that the specific implementation described herein is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0016] Example 1 A method for making a resin grinding wheel comprises the following steps: (1) 0.55 parts of ethylene glycol and 3.5 parts of silane coupling agent (KH-792) were mixed evenly to prepare an impregnating agent; (2) 0.6 parts of the impregnating agent is mixed evenly with 33 parts of zirconium corundum, 27 parts of brown corundum, and 2 parts of white corundum to obtain a mixture; (3) 3.45 parts of the impregnating agent are uniformly mixed with 11 parts of iron sulfide, 6 parts of black silicon carbide, 1 part of iron oxide, 2 parts of calcium oxide, and 3 parts of cryolite to obtain a mixture; (4) uniformly mixing the mixture in step (3) and the mixture in step (2) to obtain a mixture; (5) Mixing 5 parts of phenolic resin powder with the mixture in step (4) to obtain a mixture; (6) Evenly mixing 5 parts of dibutyl ester with the mixture in step (5) to obtain a mixture; (7) Mixing 1 part of glass fiber (1-3 mm) with the mixed material in step (6) to obtain a molding material; (8) Adding the molding material into the mold and hot pressing to form a grinding wheel blank; (9) The grinding wheel blank is hardened and then processed and inspected to obtain the finished product.

[0017] Example 2 A method for making a resin grinding wheel comprises the following steps: (1) 4.5 parts of ethylene glycol and 0.45 parts of silane coupling agent (KH-792) were mixed evenly to prepare an impregnating agent; (2) 0.3 parts of aluminum dihydrogen phosphate and 10 parts of phenolic resin powder are uniformly mixed to obtain a mixture; (3) Evenly mix 0.9 parts of the impregnating agent with 45 parts of zirconium corundum, 20 parts of brown corundum, and 3 parts of white corundum to obtain a mixture; (4) 4.05 parts of the impregnating agent are uniformly mixed with 16 parts of iron sulfide, 4 parts of black silicon carbide, 2 parts of iron oxide, 3 parts of calcium oxide, and 2 parts of cryolite to obtain a mixture; (5) uniformly mixing the mixture in step (4) and the mixture in step (3) to obtain a mixture; (6) mixing the mixture in step (2) with the mixture in step (5) to obtain a mixture; (7) uniformly mixing 1 part of dibutyl ester with the mixture in step (6) to obtain a mixture; (8) Mixing 2 parts of glass fiber (1-3 mm) with the mixed material in step (7) to obtain a molding material; (9) Adding the molding material into the mold and hot pressing to form a grinding wheel blank; (10) The grinding wheel blank is hardened and then processed and inspected to obtain the finished product.

[0018] Example 3 A method for making a resin grinding wheel comprises the following steps: (1) 2.5 parts of ethylene glycol and 2 parts of silane coupling agent (KH-792) were mixed evenly to prepare an impregnating agent; (2) 0.15 parts of aluminum dihydrogen phosphate and 7.5 parts of phenolic resin powder are uniformly mixed to obtain a mixture; (3) 0.7 parts of the impregnating agent, 39 parts of zirconium corundum, 24 parts of brown corundum, and 2.5 parts of white corundum are uniformly mixed to obtain a mixture; (4) 3.8 parts of the impregnating agent, 14 parts of iron sulfide, 5 parts of black silicon carbide, 1.5 parts of iron oxide, 2.5 parts of calcium oxide, and 2.5 parts of cryolite are uniformly mixed to obtain a mixture; (5) uniformly mixing the mixture in step (4) and the mixture in step (3) to obtain a mixture; (6) mixing the mixture in step (2) with the mixture in step (5) to obtain a mixture; (7) Mixing 3 parts of dibutyl ester and the mixture in step (6) to obtain a mixture; (8) 1.5 parts of glass fiber (1-3 mm) is mixed evenly with the mixed material in step (7) to obtain a molding material; (9) Adding the molding material into the mold and hot pressing to form a grinding wheel blank; (10) The grinding wheel blank is hardened and then processed and inspected to obtain the finished product.

[0019] Comparative Example 1 Other conditions were the same as in Example 1, except that ethylene glycol was replaced with furfural.

[0020] Comparative Example 2 Other conditions were the same as those in Example 2, except that ethylene glycol was replaced with furfural.

[0021] Comparative Example 3 Other conditions were the same as those in Example 3, except that ethylene glycol was replaced with furfural.

[0022] Comparative Example 4 Other conditions are the same as those in Example 1, except that no impregnating agent is used.

[0023] Comparative Example 5 Other conditions are the same as those in Example 2, except that no impregnating agent is used.

[0024] Comparative Example 6 Other conditions are the same as those in Example 3, except that no impregnating agent is used.

[0025] A grinding wheel with a size of φ350X50Xφ75 was used for performance testing.

[0026] 1. Strength test According to the national standard GB / T2493-2013 <Grinding wheel rotation test method>, the series of grinding wheels in the embodiment and the comparative example were tested for strength rotation at two test speeds. The linear speed was 80m / s, that is, V test = 4367*1.3 = 5670r / min and V break = 4367*1.73 = 7550r / min. The test results are as follows:

[0027] According to the test results, Examples 1, 2, 3 and Comparative Examples 1, 2, 3 all passed the V-breaking speed test, while Comparative Examples 4, 5, 6 failed the V-breaking speed test. The linear speeds of Examples 1, 2, 3 and Comparative Examples 1, 2, 3 with the same formula of the grinding wheel and the addition of impregnating agent were significantly higher than those of Comparative Examples 4, 5, 6 without the addition of impregnating agent.

[0028] 2. Heat resistance test The grinding wheels of Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, 5, 6 were placed in a hardening furnace and heat treated at 200°C for 5 hours, and then subjected to strength rotation test (grinding wheel speed was tested at V = 7550r / min) to observe the change in the attenuation of the grinding wheel structure after heating. The test results are as follows:

[0029] According to the test results, Examples 1, 2, and 3 all passed the V-fracture speed test, while Comparative Examples 1, 2, 3, 4, 5, and 6 all failed the V-fracture speed test.

[0030] The results show that the strength of Examples 1, 2, and 3 does not change after heat treatment, while the strength of Comparative Examples 1, 2, 3, 4, 5, and 6 is insufficient, and the grinding wheel structure has attenuated changes. The heat resistance of Examples 1, 2, and 3 is better than that of Comparative Examples 1, 2, 3, 4, 5, and 6.

[0031] 3. Shape retention, wear resistance, quality, efficiency The grinding wheels of Examples 1, 2, 3 and Comparative Examples 1, 2, 3 and the cold pressed resin grinding wheels were taken to the production site for grinding and other related tests. Comparative Examples 4, 5, and 6 failed the V-breaking speed inspection and were no longer subjected to grinding tests according to safety requirements.

[0032] The cold pressed resin grinding wheel adopts the model 1-350X50X75ZA / A16BQ 40m / S produced by Jiangsu Nairuite Abrasives Co., Ltd. The cold pressed resin grinding wheel uses part of the resin liquid as the grinding wheel binder, and its molding density is only 2.6g / cm 3 About (hot pressing grinding wheel forming density reaches 3.3g / Cm 3 The above mentioned constraints of cold pressed ordinary resin grinding wheel result in that under high strength working conditions, its detection line speed cannot exceed 40m / s and the grinding pressure cannot exceed 500N.

[0033] Grinding object: Petroleum high-pressure cast steel pipe, the characteristics of this kind of pipe: high hardness, high pressure resistance, strong corrosion resistance. Steel pipe size: 73 / 62 / 9000 (mm), grinding wheel grinding speed 80m / s, grinding pressure 800N. Quality standard of the steel pipe after grinding: no deformation, no burns, no obvious deep scratches on the surface, no pores, no cracks.

[0034] The test results are as follows:

[0035] According to the test results, from the perspective of shape retention, wear resistance and quality, the grinding time of Examples 1, 2 and 3 all exceeded 9 hours, while the grinding time of Comparative Examples 1, 2 and 3 could not reach 9 hours. However, there were scratches on the surface of the ground steel pipes and there was also particle loss, so they did not meet the requirements.

[0036] According to the test results, from the perspective of grinding efficiency, Examples 1, 2, and 3 can all complete grinding in one time, and the use time is significantly longer than that of the cold-pressed resin grinding wheel, so they have a long service life, high grinding efficiency, and high cost performance.

[0037] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0038] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0039] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A resin grinding wheel, characterized in that: The invention is prepared from the following raw materials by weight: 55-75 parts of abrasive, 5-10 parts of phenolic resin powder, 20-35 parts of filler, 1-8 parts of impregnating agent, 0-0.3 parts of reinforcing agent A, 1-2 parts of reinforcing agent B, and 1-5 parts of wetting agent; The impregnating agent is prepared by mixing 0.55-4.5 parts of ethylene glycol and 0.45-3.5 parts of silane coupling agent.

2. The resin grinding wheel according to claim 1, characterized in that: The abrasive comprises the following raw materials by weight: 33-45 parts of zirconium corundum, 20-27 parts of brown corundum, and 2-3 parts of white corundum.

3. The resin grinding wheel according to claim 1, characterized in that: The filler includes the following raw materials by weight: 11-16 parts of iron sulfide, 4-6 parts of black silicon carbide, 1-2 parts of iron oxide, 2-3 parts of calcium oxide, and 2-3 parts of cryolite.

4. The resin grinding wheel according to claim 1, characterized in that: In parts by mass, the enhancer A is aluminum dihydrogen phosphate.

5. The resin grinding wheel according to claim 1, characterized in that: In parts by mass, the reinforcing agent B is glass fiber.

6. The resin grinding wheel according to claim 1, characterized in that: In parts by mass, the wetting agent is dibutyl ester.

7. The method for manufacturing the resin grinding wheel according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) mixing the reinforcing agent A with the phenolic resin powder; (2) mixing the impregnating agent with the abrasive; (3) mixing the impregnating agent with the filler; (4) mixing the mixture in step (3) with the mixture in step (2); (5) mixing the mixture in step (1) with the mixture in step (4); (6) mixing the wetting agent with the mixed material in step (5); (7) mixing the reinforcing agent B with the mixed material in step (6) to obtain a molding material; (8) adding the molding material into a mold and hot pressing to form a grinding wheel blank; (9) The grinding wheel blank is hardened and then processed into a shape.

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