Grinding wheel and preparation method thereof

Abstract

The present application relates to a grinding wheel and a preparation method thereof, the preparation method comprising the following steps: dispersing an additive in an organic solvent to form an additive slurry, wherein the additive is at least one of a polyethylene resin powder and a modified polyethylene resin powder; heating the additive slurry to 110-130°C, mixing it evenly with an abrasive and a binder to obtain a mixture; loading the mixture into a mold and pressing it into a grinding wheel green body; firing the grinding wheel green body at 500-1200°C to obtain a finished grinding wheel. The grinding wheel prepared by the present invention has uniform pore distribution and extremely small pore diameter difference, so that the density difference at each position of the grinding wheel is extremely small.

Description

Technical Field

[0001] The present application belongs to the technical field of mold manufacturing, and in particular relates to a grinding wheel and a preparation method thereof. Background Art

[0002] The distribution of pores in the grinding wheel determines whether the density of the grinding wheel is uniform. If the pores in the grinding wheel are evenly distributed, the product density will be more evenly distributed, which can not only extend the service life of the abrasive tool, but also improve the use effect. Now we have successfully developed a variety of preparation processes to control the pore distribution of the grinding wheel, such as the addition of pore-forming agents, foaming methods, organic foam impregnation processes, sol-gel processes, etc.

[0003] The pore-forming agent method is the most commonly used method for preparing grinding wheels. The pore size and pore size distribution can be controlled by adjusting the formula according to the grinding purpose. This method selects a pore-forming agent to occupy a certain space in the green body. After sintering, the pore-forming agent leaves the matrix to form pores, or selects a pore-forming agent that cannot be eliminated during the sintering of the matrix. After sintering, the pore-forming agent is leached out with water, acid or alkaline solution to form pores. However, the current grinding wheel preparation process is complicated, and the pore distribution of the prepared grinding wheel is uneven. The difference between the density at the force-bearing end and the middle density is about 2%, resulting in unstable product quality. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to solve the shortcomings of the prior art that the grinding wheel preparation process is complicated, the pore distribution of the prepared grinding wheel is uneven, the pore diameter difference is large, and the density difference at each position of the grinding wheel is large, thereby providing a grinding wheel and a preparation method thereof.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A method for preparing a grinding wheel comprises the following steps:

[0007] S1: dispersing an additive in an organic solvent to form an additive slurry, wherein the additive is at least one of a polyethylene resin powder and a modified polyethylene resin powder;

[0008] S2: After heating the additive slurry to 110-130° C., mix it evenly with the abrasive and the binder to obtain a mixture;

[0009] S3: putting the mixture into a mold and pressing it into a grinding wheel green body;

[0010] S4: firing the grinding wheel green body at 500-1200° C. to obtain a finished grinding wheel.

[0011] Preferably, the mass fractions of the components for manufacturing the grinding wheel are: 70-90 parts of abrasive grains, 5-15 parts of binder, and 0.5-1 part of additives.

[0012] Preferably, the modified polyethylene resin is at least one of chlorinated polyethylene resin, chlorosulfonated polyethylene resin, maleic anhydride grafted modified polyethylene resin, and acrylic acid grafted modified polyethylene resin.

[0013] Preferably, the binder is prepared by the following method: mixing and smelting boric acid, silicon oxide, aluminum oxide, carbonate and silicate, drying, smelting again, drying, grinding and sieving.

[0014] Preferably, the smelting temperature is 1200-1600°C, and the smelting time is 3-6 hours; the drying temperature is preferably 150-250°C.

[0015] Preferably, the mass ratio of the boric acid, silicon oxide, aluminum oxide, carbonate and silicate is 35-50:40-55:5-12:18-25:8-15.

[0016] Preferably, the organic solvent is a mixture of isopropanol and acetone, and the volume ratio of isopropanol to acetone is preferably 3-5:1.

[0017] Preferably, the abrasive is at least one of boron nitride, silicon carbide, aluminum oxide and silicon dioxide.

[0018] Preferably, the environment temperature for mixing the additive solution with the abrasive and the binder is 19-25° C. and the humidity is 65%-85%.

[0019] The invention also provides a grinding wheel made by the method.

[0020] The beneficial effects of the present invention are:

[0021] The grinding wheel of the present invention only needs to use additives, abrasives and binders. Through a simple preparation process, the pore distribution of the prepared grinding wheel can be uniform, the difference in pore diameter is extremely small, and the density difference can be controlled within 1%, wherein: the additive used can reduce the friction between abrasives, increase the fluidity of abrasives, and make it easier to form. After the additive is fully mixed with the abrasive and the binder and pressed into shape, new pores are formed by high-temperature firing to achieve the expected pore diameter and uniform pore diameter distribution; further, by using a binder prepared by using specific components and specific processes, the abrasive and the additive can be uniformly and firmly combined together, the pore diameter is further controlled, the uniform pore diameter distribution is guaranteed, and the density difference at each position of the grinding wheel is extremely small. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0023] The technical solution of the present application is described in detail below in conjunction with embodiments.

[0024] Example 1

[0025] This embodiment provides a method for preparing a grinding wheel, using the following components in mass fractions: 80 parts of abrasive grains, 10 parts of a binder, and 0.8 parts of an additive. The preparation method comprises the following steps:

[0026] S1: dispersing an additive in a mixture of isopropanol and acetone in a volume ratio of 4:1 to form an additive slurry, wherein the additive is polyethylene resin powder;

[0027] S2: After heating the additive slurry to 120°C, uniformly mix it with the abrasive and the binder at a temperature of 19-25°C and a humidity of 65%-85% to obtain a mixture; the abrasive is hexagonal boron nitride, and the binder is prepared by the following method: mixing boric acid, silicon oxide, aluminum oxide, carbonate, and silicate, smelting at 1400°C for 4 hours, drying at 200°C, smelting at 1400°C for 4 hours, drying at 200°C, grinding, and sieving; the mass ratio of boric acid, silicon oxide, aluminum oxide, carbonate, and silicate is 40:50:8:20:10;

[0028] S3: putting the mixture into a mold and pressing it into a grinding wheel green body;

[0029] S4: The green grinding wheel was fired at 800° C. for 18 hours to obtain a finished grinding wheel, which was a cylinder with a height of 15 mm.

[0030] In this embodiment, the cylindrical finished grinding wheel is firstly separated from the middle. Under the metallographic microscope, it can be seen that the pore distribution of the finished grinding wheel is extremely uniform, and the difference in pore size is extremely small. Secondly, the 15 mm high cylindrical finished grinding wheel is evenly divided into 5 sections. The density of each section is measured to be 2.125, 2.124, 2.126, 2.125, and 2.124 respectively. It can be seen that the density distribution of the finished grinding wheel is extremely uniform.

[0031] Example 2

[0032] The only difference between this embodiment and embodiment 1 is that an A12O3-SiO2-B2O3-LiO2 ceramic binder is used. Similarly, the cylindrical finished grinding wheel prepared in this embodiment is split in the middle. Under a metallographic microscope, it can be seen that the pore distribution uniformity of the finished grinding wheel is significantly worse than that of embodiment 1, and the difference in pore size is also significantly greater than that of embodiment 1. Secondly, the 15 mm high cylindrical finished grinding wheel is evenly divided into 5 sections, and the density of each section is measured to be 1.932, 2.105, 2.123, 1.996, and 2.151, respectively. It can be seen that the density distribution uniformity of the finished grinding wheel is significantly worse than that of embodiment 1.

[0033] Example 3

[0034] This embodiment provides a method for preparing a grinding wheel, using the following components in mass fractions: 70 parts of abrasive grains, 5 parts of a binder, and 0.5 parts of an additive. The preparation method comprises the following steps:

[0035] S1: dispersing an additive in a mixture of isopropyl alcohol and acetone in a volume ratio of 3:1 to form an additive slurry, wherein the additive is chlorinated polyethylene resin powder;

[0036] S2: After the additive slurry is heated to 110° C., it is uniformly mixed with an abrasive and a binder at a temperature of 19-25° C. and a humidity of 65%-85% to obtain a mixture; the abrasive is silicon carbide, and the binder is prepared by the following method: boric acid, silicon oxide, aluminum oxide, carbonate, and silicate are mixed, smelted at 1200° C. for 6 hours, dried at 150° C., smelted at 1200° C. for 6 hours, dried at 150° C., ground, and sieved; the mass ratio of boric acid, silicon oxide, aluminum oxide, carbonate, and silicate is 35:40:5:18:8;

[0037] S3: putting the mixture into a mold and pressing it into a grinding wheel green body;

[0038] S4: The grinding wheel green body is fired at 500° C. for 24 hours to obtain a finished grinding wheel, which is a cylinder with a height of 15 mm.

[0039] In this embodiment, the cylindrical finished grinding wheel is firstly separated from the middle. Under the metallographic microscope, it can be seen that the pore distribution of the finished grinding wheel is extremely uniform, and the difference in pore size is extremely small. Secondly, the 15 mm high cylindrical finished grinding wheel is evenly divided into 5 sections. The density of each section is measured to be 2.118, 2.117, 2.116, 2.118, and 2.117 respectively. It can be seen that the density distribution of the finished grinding wheel is extremely uniform.

[0040] Example 4

[0041] This embodiment provides a method for preparing a grinding wheel, using the following components in mass fractions: 90 parts of abrasive grains, 15 parts of a binder, and 1 part of an additive. The preparation method comprises the following steps:

[0042] S1: dispersing an additive in a mixture of isopropanol and acetone in a volume ratio of 5:1 to form an additive slurry, wherein the additive is maleic anhydride grafted modified polyethylene resin powder;

[0043] S2: After heating the additive slurry to 130° C., uniformly mix it with an abrasive and a binder at a temperature of 19-25° C. and a humidity of 65%-85% to obtain a mixture; the abrasive is aluminum oxide, and the binder is prepared by the following method: mixing boric acid, silicon oxide, aluminum oxide, carbonate, and silicate, smelting at 1600° C. for 3 hours, drying at 250° C., smelting at 1600° C. for 3 hours, drying at 250° C., grinding, and sieving; the mass ratio of boric acid, silicon oxide, aluminum oxide, carbonate, and silicate is 50:55:12:25:15;

[0044] S3: putting the mixture into a mold and pressing it into a grinding wheel green body;

[0045] S4: firing the grinding wheel green body at 1200° C. to obtain a finished grinding wheel, wherein the finished grinding wheel is a cylinder with a height of 15 mm.

[0046] In this embodiment, the cylindrical finished grinding wheel is firstly separated from the middle. Under the metallographic microscope, it can be seen that the pore distribution of the finished grinding wheel is extremely uniform, and the difference in pore size is extremely small. Secondly, the 15 mm high cylindrical finished grinding wheel is evenly divided into 5 sections. The density of each section is measured to be 2.123, 2.122, 2.121, 2.122, and 2.121 respectively. It can be seen that the density distribution of the finished grinding wheel is extremely uniform.

[0047] Example 5

[0048] This embodiment provides a method for preparing a grinding wheel, using the following components in mass fractions: 85 parts of abrasive grains, 10 parts of a binder, and 0.6 parts of an additive. The preparation method comprises the following steps:

[0049] S1: dispersing an additive in a mixture of isopropanol and acetone in a volume ratio of 4:1 to form an additive slurry, wherein the additive is chlorosulfonated polyethylene resin powder;

[0050] S2: After heating the additive slurry to 120°C, uniformly mix it with the abrasive and the binder at a temperature of 19-25°C and a humidity of 65%-85% to obtain a mixture; the abrasive is silicon dioxide, and the binder is prepared by the following method: mixing boric acid, silicon oxide, aluminum oxide, carbonate, and silicate, smelting at 1500°C for 4 hours, drying at 200°C, smelting at 1500°C for 4 hours, drying at 200°C, grinding, and sieving; the mass ratio of boric acid, silicon oxide, aluminum oxide, carbonate, and silicate is 40:55:6:21:10;

[0051] S3: putting the mixture into a mold and pressing it into a grinding wheel green body;

[0052] S4: firing the grinding wheel green body at 1000° C. to obtain a finished grinding wheel, wherein the finished grinding wheel is a cylinder with a height of 15 mm.

[0053] In this embodiment, the cylindrical finished grinding wheel is firstly separated from the middle. Under the metallographic microscope, it can be seen that the pore distribution of the finished grinding wheel is extremely uniform, and the difference in pore size is extremely small. Secondly, the 15 mm high cylindrical finished grinding wheel is evenly divided into 5 sections. The density of each section is measured to be 2.127, 2.128, 2.129, 2.127, and 2.128 respectively. It can be seen that the density distribution of the finished grinding wheel is extremely uniform.

[0054] Based on the above ideal embodiments of this application, the relevant staff can make various changes and modifications without departing from the technical concept of this application through the above description. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing a grinding wheel, characterized in that: The steps include: S1: dispersing an additive in an organic solvent to form an additive slurry, wherein the additive is at least one of a polyethylene resin powder and a modified polyethylene resin powder; S2: After heating the additive slurry to 110-130° C., mix it evenly with the abrasive and the binder to obtain a mixture; S3: putting the mixture into a mold and pressing it into a grinding wheel green body; S4: firing the grinding wheel green body at 500-1200° C. to obtain a finished grinding wheel; The mass fractions of the components used to make the grinding wheel are: 70-90 parts of abrasive grains, 5-15 parts of binders, and 0.5-1 parts of additives; The binder is prepared by the following method: mixing and melting boric acid, silicon oxide, aluminum oxide, carbonate and silicate, drying, melting again, drying, grinding and sieving; The smelting temperature is 1200-1600°C, and the smelting time is 3-6 hours; the drying temperature is 150-250°C; The mass ratio of boric acid, silicon oxide, aluminum oxide, carbonate and silicate is 35-50:40-55:5-12:18-25:8-15; The organic solvent is a mixture of isopropanol and acetone, and the volume ratio of isopropanol to acetone is 3-5:1; The environment temperature for mixing the additive solution with the abrasive and the binder is 19-25°C and the humidity is 65%-85%.

2. The method for preparing a grinding wheel according to claim 1, characterized in that: The modified polyethylene resin is at least one of chlorinated polyethylene resin, chlorosulfonated polyethylene resin, maleic anhydride grafted modified polyethylene resin, and acrylic acid grafted modified polyethylene resin.

3. The method for preparing a grinding wheel according to any one of claims 1 to 2, characterized in that: The abrasive is at least one of boron nitride, silicon carbide, aluminum oxide and silicon dioxide.

4. A grinding wheel prepared by the method according to any one of claims 1 to 3.