CN112677059B - Preparation method of low-density large-pore ceramic grinding wheel - Google Patents
Preparation method of low-density large-pore ceramic grinding wheel Download PDFInfo
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Abstract
The invention relates to a low-density big-pore ceramic grinding wheel, which comprises 100 parts of grinding materials; 10-30 parts of ceramic bond; 5-15 parts of pore-forming agent; 2-5 parts of a resin binder; wherein the resin binder is a mixture of resin liquid and diluent, and the ratio of the resin liquid to the diluent is 1:1 to 1: 4. The low-density large-pore ceramic grinding wheel provided by the invention adopts the modulated resin binder to replace a temporary binder and a wetting agent in the prior art, so that when the low-density large-pore grinding wheel is prepared, the strength of a grinding wheel green body is improved, the appearance defect rate generated in the production process is reduced, and the product quality qualified rate is improved; meanwhile, the walnut shells subjected to surface treatment can be used for preventing the defects of cracks and the like of the ceramic grinding wheel caused by inconsistent and nonuniform volatilization in the drying and sintering processes; the grinding wheel blank pressed by the invention can be directly solidified, so that the drying time is shortened, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of grinding wheels, in particular to a preparation method of a low-density large-pore ceramic grinding wheel.
Background
The existing ceramic grinding wheel is mainly prepared from raw materials such as an abrasive, a ceramic bond, a temporary binder, a wetting agent and the like, is the most important grinding tool in the field of grinding processing, and has a very wide application range. Under some special processing requirements, in order to avoid the problems of blockage of the grinding wheel, burning of a workpiece and the like, the ceramic grinding wheel is required to have the characteristics of low density, low hardness, large pores and the like.
At present, the large-pore ceramic grinding wheel mostly adopts dextrin powder and the like as temporary binders, adopts water glass, dextrin liquid and the like as wetting agents, and adopts walnut shells and the like as pore-forming agents. When the low-density large-pore grinding wheel is prepared, the green strength of the grinding wheel is low, and the appearance defect is easily generated in the production process, so that the product quality is influenced. Meanwhile, the ceramic grinding wheel is easy to generate cracks and other defects in the drying and sintering processes.
Therefore, there is a need to provide a new low-density and large-pore vitrified grinding wheel and a preparation method thereof to solve the above problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a low-density large-pore ceramic grinding wheel.
The technical scheme of the invention is summarized as follows:
the invention provides a preparation method of a low-density large-pore ceramic grinding wheel, which comprises the following steps:
s1, designing a formula, carrying out the formula according to the following components,
100 parts of an abrasive material;
10-30 parts of ceramic bond;
5-15 parts of pore-forming agent;
2-5 parts of a resin binder;
wherein the granularity of the abrasive is 36-100 meshes, and the abrasive is a corundum abrasive;
the ceramic bond comprises 45-65 wt% of SiO25 to 15 weight percent of B2O310 to 20 weight percent of Al2O310 to 20 weight percent of alkali metal oxide and/or alkaline earth metal oxide;
the pore-forming agent is treated walnut shells, and the bulk density of the walnut shells is 1.2g/cm3；
The resin binder is a mixture of a resin liquid and a diluent, and the resin liquid comprises at least one of low-viscosity phenolic aldehyde, urea formaldehyde and furfural; the diluent is alcohol or water; the ratio of the resin liquid to the diluent is 1:1 to 1: 4; the viscosity range of the diluted resin solution at 25 ℃ is 100-200 mPa.s;
s2, mixing materials, namely uniformly mixing the resin binder and the abrasive for 5-8min, then adding the pore-forming agent, mixing for 3-5min, and then adding the ceramic bonding agent, and mixing for 10-15 min; after being uniformly mixed, the mixture is sieved according to the granularity of the grinding material;
s3, forming, wherein the speed of a press turntable is controlled at 30-50r/min during spreading;
s4, curing: naturally standing the grinding wheel blank for 12-24h, and directly heating and curing at 80-150 ℃ for 4-12h to form a cured ceramic grinding wheel blank;
s5, sintering: under sufficient oxidizing atmosphere, heating the cured ceramic grinding wheel blank to 400-500 ℃ at the speed of 1-2 ℃/min, and preserving heat for 4-6h to ensure that the resin binder is completely carbonized and decomposed; then raising the temperature to 950-.
Compared with the prior art, the invention has the beneficial effects that:
the low-density large-pore ceramic grinding wheel provided by the invention adopts the modulated resin binder to replace a temporary binder and a wetting agent in the prior art, so that when the low-density large-pore grinding wheel is prepared, the strength of a grinding wheel green body is improved, the appearance defect rate generated in the production process is reduced, and the product quality qualified rate is improved; meanwhile, the walnut shells subjected to surface treatment do not need to be soaked in water in advance, so that the material mixing process is simplified, the using amount of the walnut shells is reduced, and the defects that the ceramic grinding wheel cracks and the like due to inconsistent and uneven volatilization in the drying and sintering processes are prevented; the grinding wheel blank pressed by the invention can be directly solidified, so that the defects of cracks and the like of the ceramic grinding wheel caused by inconsistent and nonuniform volatilization during heating and drying are avoided, the drying time is shortened, and the production efficiency is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a method for preparing a low-density and large-pore ceramic grinding wheel according to the present invention.
Detailed Description
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, wherein like reference characters designate like parts throughout the several views. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict. It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The invention provides a low-density large-pore ceramic grinding wheel, which comprises:
100 parts of an abrasive;
10-30 parts of ceramic bond;
5-15 parts of a pore-forming agent;
2-5 parts of a resin binder;
wherein the resin binder is a mixture of resin liquid and diluent, and the ratio of the resin liquid to the diluent is 1:1 to 1: 4.
Specifically, the granularity of the abrasive is 36-100 meshes, and the abrasive is a corundum abrasive. Can be at least one of white corundum, brown corundum, chromium corundum, monocrystalline corundum and ceramic microcrystalline corundum.
Preferably, the ceramic binder comprises 45wt% to 65wt% SiO25 to 15 weight percent of B2O310 to 20 weight percent of Al2O310-20 wt% of alkali metal oxide and/or alkaline earth metal oxide. The ceramic bond is composed of a plurality of metal oxides, after various components are mixed, the ceramic bond is oxidized to a certain degree, the strength of the grinding wheel blank can be improved, and the ceramic bond is easy to be combined with a pore-forming agent, so that the requirements of the grinding wheel on the size and the amount of pores are met. In addition, the ceramic bond composed of the metal oxides presents low-temperature high-strength characteristics, can meet the rotation strength of the low-density large-pore ceramic grinding wheel, has the sintering temperature range of about 950-1050 ℃, has the temperature range of about 650-750 ℃ when the liquid phase starts to generate, does not influence the carbonization and decomposition of organic matters such as resin, walnut shells and the like, and avoids the existence of residual carbon.
Preferably, the pore-forming agent is treated walnut shell, and the bulk density of the walnut shell is 1.2g/cm3. The processing method comprises the following steps: the modified walnut shell is synthesized by performing esterification dehydrogenation and suspension polymerization on walnut shell, and the bulk density of the modified walnut shell is about 1.2g/cm3. In order to ensure the strength, the component proportion of the resin binder is in positive correlation with the component proportion of the walnut shells. It is composed ofThe bulk density of the treated modified walnut shells is relatively high, the bulk density of the traditional pore-forming agent walnut shells is about 0.8g/cm3, the high bulk density is favorable for mixing materials, the uniformity of the distribution of abrasive materials and the uniform distribution of air holes during molding and pressing, the air holes can remove chips and heat during grinding, and the burn and the blockage are well prevented.
Preferably, the resin liquid includes at least one of a low viscosity phenol aldehyde, urea aldehyde, furfural. The diluent is alcohol or water. The ratio of the resin liquid to the diluent is 1:1 to 1:4, and the diluted resin liquid has a viscosity range of 100-200mPa.s at 25 ℃ by adopting suspension density measurement. The walnut shells in the conventional process need to be dried after being soaked in water in advance and kept wet on the surface for use, and generally have no problems, but the conditions of low strength of a blank, nonuniform shrinkage, crack generation and the like can occur when the low-density large air holes are formed; in the invention, the resin binder formed by mixing the resin liquid and the diluent can improve the viscosity and has good wettability, and the walnut shells do not need to be soaked and can be well mixed, so that the existence of moisture can be avoided and the curing can be directly carried out. Because the diluted resin liquid naturally stands for a short time, the resin liquid can start to naturally and slowly solidify, and the green strength of the grinding wheel is higher. In addition, through a large number of experiments, when the resin liquid adopts urea formaldehyde with low viscosity, the residual substance is less, and the green strength of the grinding wheel is better.
The curing temperature during the molding of the resin binder was set to 80-150 ℃ and the carbonization temperature was set to 400-500 ℃. When the traditional ceramic grinding wheel is formed, the grinding wheel is required to have certain formability and green strength, so that a series of process flows such as normal mould unloading, drying, sintering and the like can be realized, and the defects such as damage, cracks and the like can not be generated. The existing ceramic grinding wheel generally uses the dextrin liquid and the water glass as wetting agents, uses the dextrin powder as a temporary binder, and increases the formability of a green body, but for the low-density big-pore grinding wheel, if the process is used, cracks are easy to generate during drying, the strength of the green body is low, and the problems of mold unloading during carrying and pressing are easy to occur. The resin binder is formed by diluting the resin liquid consisting of at least one of the phenolic aldehyde, the urea-formaldehyde and the furfural with low viscosity, has higher viscosity and good wettability, can directly cure walnut shells without soaking treatment and avoiding the existence of water, and can start to naturally and slowly cure because the diluted resin liquid naturally stands for a short time, and the green strength of the grinding wheel is higher, so that the low-density large-pore grinding wheel can ensure the low density and simultaneously improve the green strength.
In the low-density large-pore ceramic grinding wheel provided by the invention, corundum abrasive is adopted as the abrasive, 45-65 wt% of SiO2, 5-15 wt% of B2O3, 10-20 wt% of Al2O3 and 10-20 wt% of alkali metal oxide and/or alkaline earth metal oxide are adopted as ceramic binder, the walnut shell is degreased as pore-forming agent, the mixture of resin liquid and diluent is adopted as the resin binder, and the resin liquid is at least one of low-viscosity phenolic aldehyde, urea-formaldehyde and furfural, so that the dryness and humidity of the blank are easy to control, and the problems of uneven distribution of the walnut shell during pressing and the like caused by the fact that the blank is dry or wet can be avoided; the pressed grinding wheel blank can be directly cured, so that the defects of cracks and the like of the ceramic grinding wheel caused by inconsistent and uneven volatilization during heating and drying are avoided, the drying time is shortened, and the production efficiency is improved; after multiple times of forming, tests prove that the pressed green compact of the grinding wheel has higher strength, and the rejection rate of morphological defects and the like is reduced.
In addition, the present invention also provides a method for manufacturing a low-density large-pore vitrified grinding wheel according to the first embodiment, comprising:
s1, designing a formula, carrying out the formula according to the following components,
100 parts of an abrasive;
10-30 parts of ceramic bond;
5-15 parts of pore-forming agent;
2-5 parts of a resin binder;
wherein the resin binder is a mixture of a resin solution and a diluent, and the ratio of the resin solution to the diluent is 1:1 to 1: 4;
s2, mixing materials, namely uniformly mixing the resin binder and the abrasive for 5-8min, then adding the pore-forming agent for mixing for about 3-5min, and then adding the ceramic bond for mixing for 10-15 min; after being uniformly mixed, the mixture is sieved according to the granularity of the grinding material;
s3, forming, wherein the speed of a press turntable is controlled to be 30-50r/min during spreading;
s4, curing: naturally standing the grinding wheel blank for 12-24h, and directly heating and curing at 80-150 ℃ for 4-12h to form a cured ceramic grinding wheel blank;
s5, sintering: and sintering the cured ceramic grinding wheel blank at 950-1050 ℃ in a sufficient oxidizing atmosphere.
The sintering comprises the following steps: firstly, heating to 400-500 ℃ at the speed of 1-2 ℃/min and preserving heat for 4-6h to ensure that the resin binder is completely carbonized and decomposed; then the temperature is increased to the target temperature at the speed of 0.5-1 ℃/min and the temperature is kept for 4-8 h. In the temperature rise and heat preservation stage of 400-500 ℃ in the sintering process, a certain negative pressure state needs to be kept, so that the gas generated by carbonization and decomposition of organic matters is conveniently discharged, meanwhile, more external combustion-supporting air enters the sintering process to form sufficient oxidizing atmosphere, the complete decomposition of organic matters such as resin, walnut shells and the like is ensured, and the existence of residual carbon is avoided.
The curing temperature of the resin binder after the resin liquid and the diluent are mixed according to the proportion is 80-150 ℃, and the carbonization temperature is 400-500 ℃.
See in particular the examples below.
Example 1:
20kg of abrasive, 1kg of ceramic bonding agent, 3kg of pore-forming agent and 1kg of resin bonding agent; specifically, the abrasive is white corundum, and the ceramic bond comprises 45wt% of SiO25wt% of B2O310wt% of Al2O310wt% of alkali metal oxide, a pore-forming agent is treated walnut shells, a resin liquid adopts furfural, and a diluent is alcohol.
Firstly, uniformly mixing a resin binder and abrasive particles for about 5min, then adding a pore-forming agent for mixing for about 3min, and finally adding a ceramic binder for mixing for 10 min; after being uniformly mixed, the mixture is sieved according to the granularity of the grinding material and the pore-forming agent; the material does not need to be sealed after the material mixing, and the material can be directly pressed and formed in order to prevent the blank from solidifying and hardening; when spreading materials, the speed of a press turntable is controlled at 30r/min, so that the uniformity of spreading materials is improved; naturally standing the grinding wheel blank for 12h, and directly heating and curing at 80 ℃ for 4 h; sintering the cured ceramic grinding wheel blank at 950 ℃ in sufficient oxidizing atmosphere, heating to 400 ℃ at the speed of 1 ℃/min, and preserving heat for 4 hours to ensure that the resin binder is completely carbonized and decomposed; heating to the target temperature at the speed of 0.5 ℃/min and preserving the heat for 4 hours; and then, carrying out later-stage processing and inspection of the grinding wheel according to national standard requirements, such as green strength detection, static balance detection of the grinding wheel, drying time of the grinding wheel, crack occurrence probability, qualification rate of the low-density large-pore ceramic grinding wheel and the like. And the balance gram number in the static balance detection of the grinding wheel is used for representing the tissue uniformity of the grinding wheel.
Example 2:
20kg of abrasive, 2kg of ceramic bond, 1kg of pore-forming agent and 0.4kg of resin binder. Wherein the abrasive is white corundum, and the ceramic bond comprises 50wt% of 0 SiO210wt% of B2O315wt% of Al2O315wt% of alkali metal oxide, a pore-forming agent is treated walnut shells, the resin liquid adopts phenolic aldehyde, and the diluent is alcohol.
Firstly, uniformly mixing a resin binder and abrasive particles for about 6min, then adding a pore-forming agent for mixing for about 4min, and finally adding a ceramic bonding agent for mixing for 12 min; after being uniformly mixed, the mixture is sieved according to the granularity of the grinding material and the pore-forming agent; the material does not need to be sealed after the material mixing, and the material can be directly pressed and formed in order to prevent the blank from solidifying and hardening; when spreading materials, the speed of a press turntable is controlled at 40r/min, so that the uniformity of spreading materials is improved; naturally standing the grinding wheel blank for 18h, and directly heating and curing at 100 ℃ for 8 h; sintering the cured ceramic grinding wheel blank at 1000 ℃ in sufficient oxidizing atmosphere, firstly heating to 450 ℃ at the speed of 1.5 ℃/min and preserving heat for 5 hours to ensure that the resin binder is completely carbonized and decomposed; then heating to the target temperature at the speed of 0.75 ℃/min and preserving the heat for 5 hours; and then, carrying out later-stage processing and inspection of the grinding wheel according to national standard requirements, such as green strength detection, static balance detection of the grinding wheel, drying time of the grinding wheel, crack occurrence probability, qualification rate of the low-density large-pore ceramic grinding wheel and the like. And the balance gram number in the static balance detection of the grinding wheel is used for representing the tissue uniformity of the grinding wheel.
Example 3:
20kg of grinding materials, 3kg of ceramic bonding agents, 2kg of pore-forming agents and 0.8kg of resin bonding agents. Wherein the abrasive is white corundum, and the ceramic bond comprises 50wt% of 0% of SiO210wt% of B2O315wt% of Al2O315wt% of alkaline earth metal oxide, a pore-forming agent is treated walnut shells, a resin liquid adopts urea formaldehyde, and a diluent is alcohol.
Firstly, uniformly mixing a resin binder and abrasive particles for about 8min, then adding a pore-forming agent for mixing for about 5min, and finally adding a ceramic bonding agent for mixing for 15 min; after being uniformly mixed, the mixture is sieved according to the granularity of the grinding material and the pore-forming agent; the material does not need to be sealed after the material mixing, and the material can be directly pressed and formed in order to prevent the blank from solidifying and hardening; when spreading materials, the speed of a press turntable is controlled at 50r/min, so that the uniformity of spreading materials is improved; naturally standing the grinding wheel blank for 18h, and directly heating and curing at 150 ℃ for 12 h; sintering the cured ceramic grinding wheel blank at 1050 ℃ in sufficient oxidizing atmosphere, heating to 500 ℃ at the speed of 2 ℃/min, and preserving heat for 6 hours to ensure that the resin binder is completely carbonized and decomposed; then heating to the target temperature at the speed of 1 ℃/min and preserving the heat for 8 hours; and then, carrying out later-stage processing and inspection on the grinding wheel according to national standard requirements, such as strength detection of a green body of the vitrified grinding wheel, static balance detection of the grinding wheel, drying time of the grinding wheel, crack occurrence probability, qualification rate of the vitrified grinding wheel with low density and large pores and the like. And the balance gram number in the static balance detection of the grinding wheel is used for representing the tissue uniformity of the grinding wheel.
Example 4:
20kg of grinding materials, 6kg of ceramic bonding agents, 3kg of pore-forming agents and 1kg of resin bonding agents. Wherein the abrasive is white corundum, and the ceramic bond comprises 65wt% of SiO215wt% of B2O320wt% of Al2O320wt% of alkaline earth metal oxide, a pore-forming agent is treated walnut shells, a resin liquid adopts urea formaldehyde, and a diluent is alcohol.
Uniformly mixing a resin binder and abrasive particles for about 8min, adding a pore-forming agent, mixing for about 5min, and finally adding a ceramic binder, and mixing for 15 min; after being uniformly mixed, the mixture is sieved according to the granularity of the grinding material and the pore-forming agent; the material does not need to be sealed after the material mixing, and the material can be directly pressed and formed in order to prevent the blank from solidifying and hardening; when spreading materials, the speed of a press turntable is controlled at 50r/min, so that the uniformity of spreading materials is improved; naturally standing the grinding wheel blank for 18h, and directly heating and curing at 150 ℃ for 12 h; sintering the cured ceramic grinding wheel blank at 1050 ℃ in sufficient oxidizing atmosphere, heating to 500 ℃ at the speed of 2 ℃/min, and preserving heat for 6 hours to ensure that the resin binder is completely carbonized and decomposed; then heating to the target temperature at the speed of 1 ℃/min and preserving the heat for 8 hours; and then, carrying out later-stage processing and inspection of the grinding wheel according to national standard requirements, such as green strength detection, static balance detection of the grinding wheel, drying time of the grinding wheel, crack occurrence probability, qualification rate of the low-density large-pore ceramic grinding wheel and the like. And the balance gram number in the static balance detection of the grinding wheel is used for representing the tissue uniformity of the grinding wheel.
The pore-forming agents in the above examples 1 to 4 all used walnut shells after surface treatment,
in order to characterize the performance of the present invention, comparative examples were prepared in conventional amounts using dextrin powder and the like in the prior art as a temporary binder, water glass, dextrin solution and the like as a wetting agent, walnut shells and the like as a pore-forming agent, and the test results were obtained, and the comparative parameters with the above examples are shown in the following table.
As can be seen from the above table, the strength of the low-density large-pore ceramic grinding wheel provided by the invention can be improved by 3-5 times compared with that of the existing low-density large-pore ceramic grinding wheel; when the ceramic grinding wheel is used for mixing and compression molding, the walnut shells are distributed more uniformly, so that the pores of the finished product of the grinding wheel are distributed uniformly, and the stability and balance performance of the grinding wheel are better; the conventional grinding wheel needs to be naturally dried for 1-3 days and then heated and dried for 7-15 days, so that the time is long and cracks are easy to generate.
Therefore, the low-density large-pore ceramic grinding wheel provided by the invention adopts the modulated resin binder to replace a temporary binder and a wetting agent in the prior art, so that when the low-density large-pore grinding wheel is prepared, the strength of a grinding wheel green body is improved, the appearance defect rate generated in the production process is reduced, and the product quality qualification rate is improved; meanwhile, the walnut shells subjected to surface treatment do not need to be soaked in water in advance, so that the material mixing process is simplified, the using amount of the walnut shells is reduced, and the defects that the ceramic grinding wheel cracks and the like due to inconsistent and uneven volatilization in the drying and sintering processes are prevented; the grinding wheel blank pressed by the invention can be directly solidified, so that the defects of cracks and the like of the ceramic grinding wheel caused by inconsistent and uneven volatilization of different components during heating and drying are avoided, the drying time is shortened, and the production efficiency is improved.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (1)
1. The preparation method of the low-density big-air-hole ceramic grinding wheel is characterized by comprising the following steps of:
s1, designing a formula, carrying out the formula according to the following components,
100 parts of an abrasive;
10-30 parts of ceramic bond;
5-15 parts of pore-forming agent;
2-5 parts of a resin binder;
wherein the granularity of the abrasive is 36-100 meshes, and the abrasive is a corundum abrasive;
the ceramic bond comprises 45-65 wt% of SiO25 to 15 weight percent of B2O310 to 20 weight percent of Al2O310wt% -20wt% of alkali metal oxideAnd/or alkaline earth metal oxides;
the pore-forming agent is treated walnut shells, and the bulk density of the walnut shells is 1.2g/cm3；
The resin binder is a mixture of a resin liquid and a diluent, and the resin liquid comprises at least one of low-viscosity phenolic aldehyde, urea formaldehyde and furfural; the diluent is alcohol or water; the ratio of the resin liquid to the diluent is 1:1 to 1: 4; the viscosity range of the diluted resin solution at 25 ℃ is 100-200 mPa.s;
s2, mixing materials, namely uniformly mixing the resin binder and the abrasive for 5-8min, then adding the pore-forming agent, mixing for 3-5min, and then adding the ceramic bonding agent, and mixing for 10-15 min; after being uniformly mixed, the mixture is sieved according to the granularity of the grinding material;
s3, forming, wherein the speed of a press turntable is controlled to be 30-50r/min during spreading;
s4, curing: naturally standing the grinding wheel blank for 12-24h, and directly heating and curing at 80-150 ℃ for 4-12h to form a cured ceramic grinding wheel blank;
s5, sintering: under sufficient oxidizing atmosphere, heating the cured ceramic grinding wheel blank to 400-500 ℃ at the speed of 1-2 ℃/min, and preserving heat for 4-6h to ensure that the resin binder is completely carbonized and decomposed; then raising the temperature to 950-.
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| CN112677059A (en) | 2021-04-20 |
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