Preparation method of wear-resistant ceramic-based diamond grinding wheel

Abstract

The invention belongs to the technical field of ceramic grinding wheel preparation, and particularly comprises the following steps: step 1, weighing 25-30 parts by weight of a ceramic grinding material, 45-48 parts by weight of a ceramic bonding agent and 28-30 parts by weight of a low-temperature ceramic bonding agent, and putting into a mixer for mixing for 15-30 minutes; step 2, then putting the mixture into a mold, putting the mold into a hot press, and performing compression molding at the temperature of 180-240 DEG C and the pressure of 5-12 MPa; according to the wear-resistant ceramic grinding wheel and the preparation method thereof, the wear-resistant ceramic grinding wheel is prepared after the ceramic grinding material, the binding agent and the pre-sintered powder are loaded into the mold for hot press molding and curing, the prepared wear-resistant ceramic grinding wheel is good in wear resistance, and in the using process, when tiny crystal grains, which are blunt, on the surface layers of the abrasive particles fall off from the abrasive particles under the action of grinding force, the abrasive particles are not prone to falling off. And new sharp grinding edges are continuously exposed, so that the abrasive particles are always in a sharp state, the abrasive particles have the characteristics of better grinding effect, high strength and high impact resistance, the service life can be prolonged, and the production efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ceramic grinding wheel preparation, and particularly relates to a preparation method of a wear-resistant ceramic-based diamond grinding wheel. Background Art

[0002] A diamond grinding wheel uses diamond abrasive as raw material, and respectively uses metal powder, resin powder, ceramics and electroplated metal as binders. A circular consolidated grinding tool with a through hole in the center made thereof is called a diamond grinding wheel (alloy grinding wheel). Among them, a ceramic-bonded diamond grinding wheel is made by mixing inorganic materials such as ceramics, glass or glass-ceramics as binders with artificial diamond abrasive, and then formed by powder pressing and then sintered at high temperature. The ceramic-bonded diamond grinding wheel has high rigidity and high durability, but poor self-sharpening property, and the surface of the grinding tool is easy to be blocked. In grinding processing, problems such as the surface of the workpiece being burned and the surface quality of the workpiece being affected are likely to occur. Therefore, a preparation method of a wear-resistant ceramic-based diamond grinding wheel is needed. Summary of the Invention

[0003] To solve the problems raised in the above background art, the present invention provides a preparation method of a wear-resistant ceramic-based diamond grinding wheel, which has the characteristics of good grinding effect, high strength and high impact resistance.

[0004] To achieve the above object, the present invention provides the following technical solution: A preparation method of a wear-resistant ceramic-based diamond grinding wheel, comprising the following steps:

[0005] Step 1: Weigh 25-30 parts by weight of ceramic abrasive, 45-48 parts of ceramic binder, and 28-30 parts of the above low-temperature ceramic binder, and load them into a mixer for mixing for 15-30 min;

[0006] Step 2: Then load it into a mold and place it in a hot press. At 180-240 °C, press and form it under a pressure of 5-12 MPa, and demold to obtain a grinding wheel blank;

[0007] Step 3: Put the grinding wheel blank into an oven, cure it at 210-220 °C for 3-5 h, and then cool it to room temperature to obtain a wear-resistant ceramic grinding wheel.

[0008] The weight percentage of the ceramic abrasive is 25%-30%, the weight percentage of the ceramic binder is 28%-30%, and the pre-burned powder is 45%-48%.

[0009] Preferably, in the method for preparing the ceramic abrasive, 32-35 g of pseudo-boehmite is added to 64-70 mL of a 0.3% ammonium citrate solution by mass, and stirred and mixed at 400-500 r / min for 20-30 min. Then, 12-15 mL of a 10% nitric acid solution by mass is added, and the mixture is left standing for 10-15 min in a constant temperature water bath at 70-80 °C. Next, 3-5 g of alumina whiskers is added, and stirring is continued for 1-2 h to obtain alumina sol. Then, the alumina sol is loaded into a spray dryer for spray granulation, controlling the spray gas pressure to be 0.3-0.4 MPa and the dryer temperature to be 180-200 °C to obtain spherical alumina gel particles. Subsequently, the spherical alumina gel particles are placed in an electric resistance furnace and calcined at 1000-1200 °C for 2-3 h, and after cooling to room temperature, the product is discharged to obtain the ceramic abrasive.

[0010] Preferably, in the method for preparing the ceramic binder, 20-30 parts of SiO2, 15-25 parts of Al2O3, 30-35 parts of CaCO3, 15-20 parts of ZrO2, 10-12 parts of Na2CO3, 10-15 parts of K2CO3, 8-10 parts of Al2CO3, and 40-50 parts of H3BO3 are sieved and then mixed. The mixed material is added to a crusher for crushing, passed through a 60-mesh sieve, and then the sieved mixed material powder is loaded into a ball mill for ball milling for 40-50 min to obtain the ceramic binder.

[0011] Preferably, in the method for preparing the pre-calcined powder, 10-15 parts of magnesite powder, 15-20 parts of white fused alumina, 40-50 parts of absolute ethanol, and 20-30 parts of walnut shell powder are put into a mortar for grinding and left standing to obtain the pre-calcined powder.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. In the present invention, by loading the ceramic abrasive, binder, and pre-calcined powder into a mold for hot pressing and forming, a wear-resistant ceramic grinding wheel is obtained after curing. The prepared wear-resistant ceramic grinding wheel has good wear resistance. During use, when the tiny grains on the surface layer of the abrasive grains are worn dull and fall off from the abrasive grains under the action of the grinding force, new sharp grinding edges are continuously exposed, making the abrasive grains always in a sharp state, having the characteristics of good grinding effect, high strength, and high impact resistance, which can extend the service life and effectively improve production efficiency. Description of the Drawings

[0014] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0015] Figure 1 is a schematic diagram of the grinding wheel preparation process in the present invention;

[0016] Figure 2 Schematic structural diagram of the ceramic grinding wheel prepared in the present invention;

[0017] Figure 3 Schematic structural diagram of the microstructure of the ceramic binder in the present invention. Specific embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Example 1

[0020] Please refer to Figures 1-3 , the present invention provides the following technical solutions: A preparation method of a wear-resistant ceramic-based diamond grinding wheel, comprising the following steps:

[0021] Step 1: Weigh 25-30 parts of ceramic abrasive, 45-48 parts of ceramic binder, and 28-30 parts of the above low-temperature ceramic binder by weight, and load them into a mixer for mixing for 15-30 min;

[0022] Step 2: Then load it into a mold and place it in a hot press. At 180-240 °C, press and mold it under a pressure of 5-12 MPa, and demold to obtain a grinding wheel blank;

[0023] Step 3: Put the grinding wheel blank into an oven, cure it at 210-220 °C for 3-5 h, and then cool it to room temperature to obtain a wear-resistant ceramic grinding wheel.

[0024] The weight percentage of the ceramic abrasive is 25% - 30%, the weight percentage of the ceramic binder is 28% - 30%, and the pre-burned powder is 45% - 48%.

[0025] Specifically, for the preparation method of the ceramic abrasive, 32 g of pseudoboehmite is added to 64 mL of a 0.3% ammonium citrate solution by mass fraction, stirred and mixed at 400 r / min for 20 min, then 15 mL of a 10% nitric acid solution by mass fraction is added, and it is left standing for 15 min in a constant temperature water bath at 80 °C. Then 5 g of alumina whiskers are added and stirring is continued for 2 h to obtain alumina sol. Then the alumina sol is loaded into a spray dryer for spray granulation, controlling the spray gas pressure to be 0.4 MPa and the dryer temperature to be 200 °C to obtain spherical alumina gel particles. Subsequently, the spherical alumina gel particles are placed in an electric resistance furnace and calcined at 1200 °C for 2 h, and then discharged after cooling to room temperature to obtain the ceramic abrasive.

[0026] Specifically, for the preparation method of the ceramic bond, 30 parts of SiO2, 25 parts of Al2O3, 30 parts of CaCO3, 15 parts of ZrO2, 10 parts of Na2CO3, 15 parts of K2CO3, 10 parts of Al2CO3, and 50 parts of H3BO3 are sieved and then mixed. The mixed materials are added to a crusher for crushing, passed through a 60-mesh sieve, and then the sieved mixed material powder is loaded into a ball mill for ball milling for 40 minutes to obtain the ceramic bond.

[0027] Specifically, for the preparation method of the pre-fired powder, 15 parts of magnesite powder, 15 parts of white fused alumina, 50 parts of absolute ethanol, and 30 parts of walnut shell powder are put into a mortar for grinding and then left standing to obtain the pre-fired powder.

[0028] In this embodiment, by weight, 30 parts of ceramic abrasive, 48 parts of phenolic resin, and 30 parts of the above-mentioned low-temperature ceramic bond are weighed, loaded into a mixer for mixing for 30 minutes, then loaded into a mold and placed in a hot press. At 240 °C, it is pressed and formed under a pressure of 12 MPa, and after demolding, the grinding wheel blank is obtained. The grinding wheel blank is placed in an oven and cured at 220 °C for 5 hours and then cooled to room temperature to obtain the wear-resistant ceramic grinding wheel.

[0029] Example 2

[0030] Please refer to Figures 1-3 , the present invention provides the following technical solutions: A preparation method of a wear-resistant ceramic-based diamond grinding wheel, including:

[0031] Step 1: By weight, 25 - 30 parts of ceramic abrasive, 45 - 48 parts of ceramic bond, and 28 - 30 parts of the above-mentioned low-temperature ceramic bond are weighed, loaded into a mixer for mixing for 15 - 30 minutes;

[0032] Step 2: Then it is loaded into a mold and placed in a hot press. At 180 - 240 °C, it is pressed and formed under a pressure of 5 - 12 MPa, and after demolding, the grinding wheel blank is obtained;

[0033] Step 3: The grinding wheel blank is placed in an oven and cured at 210 - 220 °C for 3 - 5 hours and then cooled to room temperature to obtain the wear-resistant ceramic grinding wheel.

[0034] The weight percentage of the ceramic abrasive is 25% - 30%, the weight percentage of the ceramic bond is 28% - 30%, and the pre-fired powder is 45% - 48%.

[0035] Specifically, for the preparation method of ceramic abrasive, 35 g of pseudo-boehmite is added to 70 mL of ammonium citrate tribasic solution with a mass fraction of 0.3%, stirred and mixed at 500 r / min for 30 min, then 15 mL of nitric acid solution with a mass fraction of 10% is added, and left standing for 15 min under a constant temperature water bath at 80 °C. Then 5 g of alumina whiskers is added and stirring continues for 1.5 h to obtain alumina sol. Then the alumina sol is loaded into a spray dryer for spray granulation, controlling the spray gas pressure at 0.4 MPa and the dryer temperature at 200 °C to obtain spherical alumina gel particles. Subsequently, the spherical alumina gel particles are placed in an electric resistance furnace and calcined at 1200 °C for 3 h, and after cooling to room temperature, the product is discharged to obtain the ceramic abrasive.

[0036] Specifically, for the preparation method of ceramic binder, 30 parts of SiO2, 25 parts of Al2O3, 35 parts of CaCO3, 0 parts of ZrO2, 12 parts of Na2CO3, 15 parts of K2CO3, 10 parts of Al2CO3, and 50 parts of H3BO3 are sieved and then mixed. The mixed material is added to a crusher for crushing, passed through a 60-mesh sieve, and then the sieved mixed material powder is loaded into a ball mill for ball milling for 50 min to obtain the ceramic binder.

[0037] Specifically, for the preparation method of pre-fired powder, 15 parts of magnesite powder, 20 parts of white fused alumina, 50 parts of absolute ethanol, and 30 parts of walnut shell powder are put into a mortar for grinding and left standing to obtain the pre-fired powder.

[0038] In this embodiment, by weight, 30 parts of ceramic abrasive, 48 parts of phenolic resin, and 30 parts of the above-mentioned low-temperature ceramic binder are weighed, loaded into a mixer for mixing for 20 min, then loaded into a mold and placed in a hot press, and pressed into shape at 180 °C under a pressure of 5 MPa. After demolding, a grinding wheel blank is obtained. The grinding wheel blank is put into an oven and cured at 220 °C for 4 h, and then cooled to room temperature to obtain the wear-resistant ceramic grinding wheel.

[0039] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a wear-resistant ceramic-based diamond grinding wheel, comprising the following steps: Step 1: weigh 25-30 parts of ceramic abrasive, 45-48 parts of ceramic binder, and 28-30 parts of the above-mentioned low-temperature ceramic binder by weight, put them into a mixer and mix them for 15-30 minutes; Step 2: Then put it into a mold and place it in a hot press, press it at 180-240°C and 5-12MPa pressure, and demold it to obtain a grinding wheel blank; Step 3: Place the grinding wheel blank in an oven, cure it at 210-220° C. for 3-5 hours, and then cool it to room temperature to obtain a wear-resistant ceramic grinding wheel. The invention is characterized in that the weight percentage of the ceramic abrasive is 25% to 30%, the weight percentage of the ceramic binder is 28% to 30% and the weight percentage of the pre-burned powder is 45% to 48%.

2. The method for preparing a wear-resistant ceramic-based diamond grinding wheel according to claim 1, characterized in that: The ceramic abrasive preparation method comprises the following steps: adding 32-35 g of pseudo-boehmite to 64-70 mL of 0.3% triammonium citrate solution, stirring and mixing at 400-500 r / min for 20-30 min, adding 12-15 mL of 10% nitric acid solution, standing in a constant temperature water bath at 70-80° C. for 10-15 min, adding 3-5 g of alumina whiskers, and continuing stirring for 1-2 h to obtain alumina sol, then placing the alumina sol in a spray dryer for spray granulation, controlling the spray gas pressure to be 0.3-0.4 MPa, and the dryer temperature to be 180-200° C. to obtain spherical alumina gel particles, then placing the spherical alumina gel particles in a resistance furnace, calcining at 1000-1200° C. for 2-3 h, and discharging the particles after cooling to room temperature to obtain the ceramic abrasive.

3. The method for preparing a wear-resistant ceramic-based diamond grinding wheel according to claim 1, characterized in that: The ceramic binder preparation method comprises the following steps: sieve 20 to 30 parts of SiO2, 15 to 25 parts of Al2O3, 30 to 35 parts of CaCO3, 15 to 20 parts of ZrO2, 10 to 12 parts of Na2CO3, 10 to 15 parts of K2CO3, 8 to 10 parts of Al2CO3 and 40 to 50 parts of H3BO3, mix the mixture, add the mixture into a pulverizer, grind the mixture, pass through a 60-mesh sieve, and then put the sieved mixture powder into a ball mill and ball-mill for 40 to 50 minutes to obtain the ceramic binder.

4. The method for preparing a wear-resistant ceramic-based diamond grinding wheel according to claim 1, characterized in that: The method for preparing the pre-burned powder comprises the following steps: putting 10 to 15 parts of magnesium ore powder, 15 to 20 parts of white corundum, 40 to 50 parts of anhydrous ethanol and 20 to 30 parts of walnut shell powder into a mortar, grinding the mortar, and letting the mortar stand to obtain the pre-burned powder.

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