CN110561283A - Self-lubricating gear grinding wheel and preparation method thereof - Google Patents
Self-lubricating gear grinding wheel and preparation method thereof Download PDFInfo
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- CN110561283A CN110561283A CN201810574316.XA CN201810574316A CN110561283A CN 110561283 A CN110561283 A CN 110561283A CN 201810574316 A CN201810574316 A CN 201810574316A CN 110561283 A CN110561283 A CN 110561283A
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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
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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
- B24D3/04—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 inorganic
- B24D3/14—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 inorganic ceramic, i.e. vitrified bondings
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- Polishing Bodies And Polishing Tools (AREA)
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Abstract
the invention discloses a self-lubricating gear grinding wheel which is prepared from the following raw materials, by weight, 12 ~ 20 parts of ceramic bond, 70 ~ 100 parts of zirconium corundum, 5 ~ 8 parts of silicon carbide, 3 ~ 5 parts of yellow dextrin and 2 ~ 3 parts of water.
Description
Technical Field
The invention belongs to the technical field of grinding wheel manufacturing, and particularly relates to a self-lubricating gear grinding wheel and a preparation method thereof.
Background
The iron-based gear is a common part in modern industry and is widely applied to the mechanical manufacturing industry, the last processing procedure of the iron-based gear for high-end use at present is to grind the gear by adopting a special gear grinding wheel, so that the processing precision and the surface smoothness of the gear can be improved, but when the gear bottom of the gear is ground by the gear grinding wheel, the contact surface of the gear grinding wheel and a workpiece is large, three sides of the grinding wheel are shielded by the gear, cooling liquid is difficult to enter a grinding area, the grinding force is large, the workpiece is easy to burn, and the processing surface roughness is large.
However, because the lubricant such as graphite or molybdenum disulfide has low strength, the lubricant is ground and broken by the abrasive such as corundum in the grinding wheel during the mixing process of the grinding wheel to form submicron-grade small particles which are adsorbed on the surface of the corundum abrasive. In the sintering process of the grinding wheel, the lubricant particles adsorbed on the surface of the corundum can greatly reduce the bonding strength between the bonding agent and the grinding materials such as corundum and the like, so that the grinding materials such as corundum and the like can fall off in advance in the grinding process by a light person, and the service life of the grinding wheel is reduced; the serious person causes the broken flying piece in the use process of the grinding wheel, and safety accidents are caused. How to avoid the reduction of the bonding strength between the bonding agent and the abrasive caused by adding the lubricant is a problem which needs to be solved urgently.
disclosure of Invention
The invention provides a self-lubricating gear grinding wheel and a preparation method thereof, aiming at the problem that the bonding strength of a bonding agent and an abrasive material is reduced due to the addition of lubricants such as graphite, molybdenum disulfide and the like.
The invention provides a self-lubricating gear grinding wheel which is prepared from the following raw materials in parts by weight:
12 ~ 20 parts of ceramic bond, 70 ~ 100 parts of zirconia alumina, 5 ~ 8 parts of silicon carbide, 3 ~ 5 parts of yellow dextrin and 2 ~ 3 parts of water.
In one embodiment, the ceramic bond is prepared from the following raw materials in parts by weight:
15 ~ 30 parts of boron glass powder, 5 ~ 10 parts of alkali-free glass powder, 20 ~ 30 parts of spodumene powder, 30 ~ 50 parts of kaolin and 5 ~ 10 parts of bauxite.
In one embodiment, the silicon carbide is cubic silicon carbide.
The invention also provides a preparation method of the self-lubricating gear grinding wheel, which comprises the following steps:
preparing materials, namely weighing and uniformly mixing the preparation raw materials of the gear grinding wheel according to the formula ratio to prepare a gear grinding wheel blank;
Molding, namely pressing and molding the grinding wheel blank to obtain a grinding wheel blank;
And sintering, namely sintering the grinding wheel blank to obtain the gear grinding wheel.
In one embodiment, in the material preparing step, the raw materials for preparing the grinding tooth wheel are mixed in a ball mill, the ball grinding stone of the ball mill is corundum balls, the ball-material ratio is 1:1, the diameter of the ball grinding stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 ~ 80 rpm, and the ball milling time is 1 ~ 2 h.
In one embodiment, in the step of batching, the ceramic binder is prepared in advance, and the preparation method of the ceramic binder comprises the following steps:
Weighing ceramic bond raw materials according to the formula ratio, and mixing the raw materials by a ball mill, wherein the ball grinding stones of the ball mill are corundum balls, the ball-material ratio is 1:1, the diameter of the ball grinding stones is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 ~ 80 rpm, and the ball milling time is 1 ~ 2 h.
In one embodiment, in the forming step, the forming pressure of the grinding wheel blank is 50 ~ 70 MPa, and the forming dwell time is 0.5 ~ 2 min.
In one embodiment, after the forming step, the method further comprises the following steps:
And (3) drying, namely, after the gear grinding wheel green body is placed at room temperature for 22 ~ 26 h, drying at 60 ~ 70 ℃ for 10 ~ 14 h.
In one embodiment, in the sintering step, in the sintering process, the temperature is increased to 400 ~ 500 ℃ at a temperature increasing rate of 4 ~ 6 ℃/min, the temperature is maintained for 1 ~ 2h, then the temperature is increased to 900 ~ 1000 ℃ at a temperature increasing rate of 3 ~ 4 ℃/min, the temperature is maintained for 3 ~ 5 h, and then the product is naturally cooled.
in one embodiment, the sintering is sand-burying sintering or vacuum sintering.
the raw materials of the self-lubricating gear grinding wheel contain a certain amount of silicon carbide, and in the preparation process of the gear grinding wheel, the silicon carbide finally forms graphite particles which independently exist in the tissue structure of the grinding wheel in the form of micron-sized particles, and the graphite particles cannot be adsorbed on the surface of corundum abrasive materials, so that the bonding strength of a ceramic bonding agent to the corundum abrasive materials cannot be influenced, the lubricating performance is ensured, and the service life and the rotary strength of the grinding wheel cannot be reduced.
Drawings
FIG. 1 is a photomicrograph of the texture of a gear grinding wheel according to a first embodiment of the present invention;
FIG. 2 is a photograph showing the surface topography of a gear tooth bottom machined by the gear grinding wheel according to the first embodiment of the present invention;
FIG. 3 is a photograph of the surface topography of the tooth bottom of a gear machined by a conventional gear grinding wheel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of a self-lubricating gear grinding wheel, which comprises the following steps:
Preparing materials, namely weighing and uniformly mixing the preparation raw materials of the gear grinding wheel according to the formula ratio to prepare a gear grinding wheel blank;
Molding, namely pressing and molding the grinding wheel blank to obtain a grinding wheel blank;
And sintering, namely sintering the grinding wheel blank to obtain the gear grinding wheel.
The gear grinding wheel comprises the following raw materials in parts by weight:
12 ~ 20 parts of ceramic bond, 70 ~ 100 parts of zirconia alumina, 5 ~ 8 parts of silicon carbide, 3 ~ 5 parts of yellow dextrin and 2 ~ 3 parts of water.
the raw materials of the self-lubricating gear grinding wheel contain a certain amount of silicon carbide, the silicon carbide can stably exist at a lower temperature, when a gear grinding wheel blank is sintered, the silicon carbide has great chemical reaction activity at the sintering temperature, the ceramic bonding agent often contains alkali metal oxide, the alkali metal oxide can react with the silicon carbide to generate alkali metal silicate and graphite particles, and the graphite particles in the gear grinding wheel tissue provide a lubricating effect in the grinding process of the wheel, so that the self-lubricating gear grinding wheel is obtained. According to the invention, silicon carbide is used as a precursor of a graphite lubricant, low-strength lubricant components such as graphite or molybdenum disulfide and the like do not exist in the processes of proportioning and forming of the gear grinding wheel, and the compressive strength and hardness of the silicon carbide are higher than those of a zirconium corundum abrasive, so that the silicon carbide keeps the granularity of the silicon carbide in the processes of proportioning, mixing and forming, and cannot be crushed into submicron-sized small particles to be adsorbed on the zirconium corundum to reduce the bonding strength of the abrasive and a ceramic bond, thereby reducing the strength of the grinding wheel. At the sintering temperature, the ceramic bond is changed into a liquid phase, alkali metal oxide in the ceramic bond reacts with silicon carbide to generate alkali metal silicate and graphite simple substance, the alkali metal silicate enters the ceramic bond through thermal diffusion, the graphite simple substance is generated in situ at the original position of the silicon carbide, exists in the texture structure of the grinding wheel in the form of large particles, does not exist on the surface of the corundum abrasive material in the form of submicron-sized particles, and has no adverse effect on the strength, service life and strength of the grinding wheel. Meanwhile, in the grinding process of the gear grinding wheel, graphite particles in the grinding wheel can generate a lubricating effect, and the surface smoothness of a part processing surface is obviously improved.
Furthermore, the yellow dextrin contained in the raw materials of the self-lubricating gear grinding wheel has an excellent effect on the initial qualitative of the grinding wheel, and can ensure that the silicon carbide is uniformly and stably distributed in the grinding wheel, so that the distribution uniformity of graphite particles generated by the reaction of the silicon carbide in the grinding wheel is improved, and the self-lubricating effect of the gear grinding wheel is further improved.
As an optional embodiment, the ceramic binder comprises the following raw materials:
15 ~ 30 parts of boron glass powder, 5 ~ 10 parts of alkali-free glass powder, 20 ~ 30 parts of spodumene powder, 30 ~ 50 parts of kaolin and 5 ~ 10 parts of bauxite.
the raw material proportion of the ceramic bond can form the special ceramic bond for the gear grinding wheel to improve the bonding capacity of the ceramic bond and the grinding material, and the boron glass powder and the spodumene powder both contain a large amount of alkali metal oxide to provide sufficient alkali metal oxide for the reaction of the ceramic bond and silicon carbide in the sintering process, so that the full reaction of the silicon carbide is promoted, the proportion of the silicon carbide reacting to generate graphite is improved, and the self-lubricating effect of the gear grinding wheel is improved.
As an alternative embodiment, the silicon carbide in the grinding wheel is cubic silicon carbide. The cubic silicon carbide is a low-temperature stable crystal form of silicon carbide, namely a diamond crystal form, the strength and hardness of the cubic silicon carbide are higher than those of a zirconia corundum abrasive, and when the ingredients are mixed with the zirconia corundum abrasive, the cubic silicon carbide can keep the original granularity and cannot be crushed by the zirconia corundum abrasive and adsorbed on the surface of the abrasive.
In an alternative embodiment, the boron glass powder, the alkali-free glass powder, the spodumene powder, the kaolin and the bauxite have a particle size of 5 μm or less. As the raw material of the ceramic bond, the smaller the particle size, the better the function of the bond is, and the bonding strength between the ceramic bond and the abrasive is enhanced.
in the embodiment, the zirconia alumina in the raw material of the gear grinding wheel comprises 60# zirconia alumina and 80# zirconia alumina, the proportion of the 60# zirconia alumina is 60 ~ 70 parts, and the proportion of the 80# zirconia alumina is 10 ~ 30 parts.
further, as an alternative embodiment, the mesh number of the silicon carbide is 80 ~ 320 #. the grain diameter of the silicon carbide is in the range, and graphite particles formed during sintering of the grinding wheel are generated in situ in the silicon carbide, and the grain diameter of the graphite particles is in the range, so that the grain diameter of the graphite particles is 80 ~ 320#, the self-lubricating effect of the graphite on the grinding process of the gear grinding wheel can be improved.
in an optional embodiment, in the step of batching, the raw materials for preparing the grinding wheel with teeth are mixed in a ball mill, the ball grinding stones of the ball mill are corundum balls, the ball-material ratio is 1:1, the diameter of the ball grinding stones is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 ~ 80 rpm, and the ball milling time is 1 ~ 2 h.
as an alternative embodiment, in the step of batching, the ceramic binder is prepared in advance, and the preparation method of the ceramic binder comprises the following steps:
Weighing ceramic bond raw materials according to the formula ratio, mixing by a ball mill, wherein the ball grinding stones of the ball mill are corundum balls, the ball-material ratio is 1:1, the diameter of the ball grinding stones is 2 cm, the diameter of a ball grinding jar is 500mm, the rotating speed is 50 ~ 80 rpm, and the ball grinding time is 1 ~ 2 h.
In an optional embodiment, in the forming step, the forming pressure of the grinding wheel blank is 50 ~ 70 MPa, and the forming dwell time is 0.5 ~ 2 min.
As an alternative embodiment, after the forming step, the method further comprises the following steps:
Drying, namely placing the gear grinding wheel blank at room temperature for 22 ~ 26 h, and drying at 60 ~ 70 ℃ for 10 ~ 14 h, wherein the gear grinding wheel blank contains water, and the forming of the wheel blank can be improved by adding a proper amount of water, however, if the blank contains more water, the sintering effect is influenced, the invention can avoid the generation of cracks in the drying process and improve the drying efficiency by drying at room temperature and 60 ~ 70 ℃ in sequence, and is also beneficial to improving the sintering effect.
In an optional embodiment, in the sintering step, in the sintering process, the temperature is increased to 400 ~ 500 ℃ at a temperature increasing rate of 4 ~ 6 ℃/min, the temperature is maintained for 1 ~ 2h, then the temperature is increased to 900 ~ 1000 ℃ at a temperature increasing rate of 3 ~ 4 ℃/min, the temperature is maintained for 3 ~ 5 h, and then the silicon carbide is naturally cooled.
As an alternative embodiment, the sintering is sand-burying sintering or vacuum sintering. Through sand burying sintering or vacuum sintering, can make the isolated oxygen of emery wheel among the sintering process, avoid graphite particle oxidation to cause the inefficacy of self-lubricating effect.
Example 1
Step 1, respectively weighing 20 kg of boron glass powder, 10 kg of alkali-free glass powder, 30kg of spodumene powder, 30kg of kaolin and 10 kg of bauxite, and performing ball milling dry mixing, wherein the ball stone is corundum balls, the ball material ratio is 1:1, the diameter of the ball mill stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 60 rpm, and the ball milling time is 1 h, so that the ceramic bond for the gear grinding wheel, which is uniformly mixed, is prepared.
and Step 2, respectively weighing 15kg of the ceramic bond, 60 kg of 60# zirconium corundum, 15kg of 80# zirconium corundum, 5kg of 100# cubic silicon carbide, 3 kg of yellow dextrin and 2 kg of water, and uniformly mixing under a ball milling condition, wherein the ball stone is corundum balls, the ball-material ratio is 1:1, the diameter of the ball stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 60 rpm, and the ball milling time is 2 hours, so that the uniformly mixed self-lubricating gear grinding wheel blank is obtained.
Step 3, selecting a corresponding die according to the specification of the gear grinding wheel to be formed, weighing a gear grinding wheel blank with corresponding mass, putting the gear grinding wheel blank into the die, carrying out pressure forming under the forming pressure of 70 MPa for 1 min, carrying out pressure relief and demoulding, horizontally placing the formed grinding wheel blank on a SiC shed board, placing the SiC shed board at room temperature for 24 h, and then placing the SiC shed board in an oven at 70 ℃ for drying for 12 h to obtain the dried grinding wheel blank.
And Step 4, loading the tooth grinding wheel blank into a bowl made of refractory clay, and completely burying the self-lubricating precision grinding wheel by using No. 150 white corundum powder, wherein the height of the white corundum powder is 1.5 cm higher than the upper surface of the grinding wheel. Placing the box bowl embedded with the corundum into a well type furnace, heating to 500 ℃ at a heating rate of 5 ℃/min, preserving heat for 1 h, heating to 1000 ℃ at a heating rate of 4 ℃/min, preserving heat for 3 h, naturally cooling the gear grinding wheel in an electric furnace after closing the furnace, opening a furnace door for cooling when the furnace temperature is lower than 150 ℃, and taking the gear grinding wheel out of the box bowl when the temperature is lower than 70 ℃ to obtain a finished product of the gear grinding wheel.
As shown in fig. 1, it can be seen that the graphite particles are uniformly distributed in the texture of the tooth grinding wheel in the form of large particles, and do not exist on the surface of the corundum-zirconia abrasive material in the form of submicron-sized small particles, and the texture of the tooth grinding wheel prepared in this embodiment has an adverse effect on the service life and strength of the wheel. Further, the surface topography of the gear bottom processed by the gear grinding wheel is shown in fig. 2, and compared with the surface topography of the gear bottom processed by the gear grinding wheel which is not added with graphite conventionally shown in fig. 3, the graphite particles in the gear grinding wheel of the embodiment can generate a lubricating effect in the gear grinding process, so that the surface smoothness of the processed surface of the gear is obviously improved.
Example 2
step 1, weighing 15kg of boron glass powder, 5kg of alkali-free glass powder, 20 kg of spodumene powder, 30kg of kaolin and 5kg of bauxite respectively, and performing ball milling dry mixing, wherein the ball stone is corundum balls, the ball material ratio is 1:1, the diameter of the ball mill stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 rpm, and the ball milling time is 1 h, so that the ceramic bond for the gear grinding wheel, which is uniformly mixed, is prepared.
and Step 2, respectively weighing 12 kg of the ceramic bond, 60 kg of 60# zirconium corundum, 10 kg of 80# zirconium corundum, 5kg of 80# cubic silicon carbide, 3 kg of yellow dextrin and 2 kg of water, and uniformly mixing under a ball milling condition, wherein the ball stone is corundum balls, the ball-material ratio is 1:1, the diameter of the ball stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 rpm, and the ball milling time is 1 h to obtain the uniformly mixed self-lubricating gear grinding wheel blank.
step 3, selecting a corresponding die according to the specification of the gear grinding wheel to be formed, weighing a gear grinding wheel blank with corresponding mass, putting the gear grinding wheel blank into the die, carrying out pressure forming under the forming pressure of 50 MPa for 0.5 min, carrying out pressure relief and demoulding, horizontally placing the formed grinding wheel blank on a SiC shed plate, placing the SiC shed plate for 22 h at room temperature, and then placing the SiC shed plate in a 60 ℃ oven for drying for 10 h to obtain the dried grinding wheel blank.
And Step 4, loading the tooth grinding wheel blank into a bowl made of refractory clay, and completely burying the self-lubricating precision grinding wheel by using No. 150 white corundum powder, wherein the height of the white corundum powder is 1.5 cm higher than the upper surface of the grinding wheel. And (3) putting the box bowl embedded with the corundum into a well type furnace, heating to 400 ℃ at a heating rate of 4 ℃/min, preserving heat for 1 h, heating to 900 ℃ at a heating rate of 3 ℃/min, preserving heat for 3 h, naturally cooling the gear grinding wheel in an electric furnace after the furnace is closed, opening a furnace door for cooling when the furnace temperature is lower than 150 ℃, and taking the gear grinding wheel out of the box bowl when the temperature is lower than 70 ℃ to obtain a finished product of the gear grinding wheel.
Example 3
Step 1, respectively weighing 30kg of boron glass powder, 10 kg of alkali-free glass powder, 30kg of spodumene powder, 50 kg of kaolin and 10 kg of bauxite, and performing ball milling dry mixing, wherein the ball stone is corundum balls, the ball material ratio is 1:1, the diameter of the ball mill stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 80 rpm, and the ball milling time is 2 hours, so as to prepare the ceramic bond for the gear grinding wheel, which is uniformly mixed.
And Step 2, respectively weighing 20 kg of the ceramic bond, 70 kg of No. 60 zirconium corundum, 30kg of No. 80 zirconium corundum, 8 kg of No. 320 cubic silicon carbide, 5kg of yellow dextrin and 3 kg of water, and uniformly mixing under a ball milling condition, wherein the ball stone is corundum balls, the ball-material ratio is 1:1, the diameter of the ball stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 80 rpm, and the ball milling time is 2 hours, so that the uniformly mixed self-lubricating gear-grinding wheel blank is obtained.
And Step 3, selecting a corresponding die according to the specification of the gear grinding wheel to be formed, weighing a gear grinding wheel blank with corresponding mass, putting the gear grinding wheel blank into the die, carrying out pressure forming under the forming pressure of 70 MPa for 2 min, carrying out pressure relief and demoulding, horizontally placing the formed grinding wheel blank on a SiC shed board, placing the SiC shed board at room temperature for 26 h, and then placing the SiC shed board in a 70 ℃ oven for drying for 14 h to obtain the dried grinding wheel blank.
And Step 4, loading the tooth grinding wheel blank into a bowl made of refractory clay, and completely burying the self-lubricating precision grinding wheel by using No. 150 white corundum powder, wherein the height of the white corundum powder is 1.5 cm higher than the upper surface of the grinding wheel. And (3) putting the box bowl embedded with the corundum into a well type furnace, heating to 500 ℃ at a heating rate of 6 ℃/min, preserving heat for 2 hours, heating to 1000 ℃ at a heating rate of 4 ℃/min, preserving heat for 5 hours, naturally cooling the gear grinding wheel in an electric furnace after closing the furnace, opening a furnace door for cooling when the furnace temperature is lower than 150 ℃, and taking the gear grinding wheel out of the box bowl when the temperature is lower than 70 ℃ to obtain a finished product of the gear grinding wheel.
Example 4
step 1, respectively weighing 25 kg of boron glass powder, 7 kg of alkali-free glass powder, 25 kg of spodumene powder, 40 kg of kaolin and 7 kg of bauxite, and performing ball milling dry mixing, wherein the ball stone is corundum balls, the ball material ratio is 1:1, the diameter of the ball mill stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 rpm, and the ball milling time is 1.5 h, so as to prepare the ceramic bond for the gear grinding wheel, which is uniformly mixed.
and Step 2, respectively weighing 17 kg of the ceramic bond, 65 kg of No. 60 zirconium corundum, 20 kg of No. 80 zirconium corundum, 7 kg of No. 250 cubic silicon carbide, 4 kg of yellow dextrin and 2.5 kg of water, and uniformly mixing under a ball milling condition, wherein the ball stone is corundum balls, the ball-material ratio is 1:1, the diameter of the ball stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 70 rpm, and the ball milling time is 1.5 h, so as to obtain the uniformly mixed self-lubricating grinding tooth grinding wheel blank.
Step 3, selecting a corresponding die according to the specification of the gear grinding wheel to be formed, weighing a gear grinding wheel blank with corresponding mass, putting the gear grinding wheel blank into the die, carrying out pressure forming under the forming pressure of 65 MPa, keeping the pressure for 1 min, releasing pressure, demolding, horizontally placing the formed grinding wheel blank on a SiC shed board, placing the SiC shed board at room temperature for 24 hours, and then placing the SiC shed board in a 65 ℃ oven for drying for 12 hours to obtain the dried grinding wheel blank.
And Step 4, loading the tooth grinding wheel blank into a bowl made of refractory clay, and completely burying the self-lubricating precision grinding wheel by using No. 150 white corundum powder, wherein the height of the white corundum powder is 1.5 cm higher than the upper surface of the grinding wheel. Placing the box bowl embedded with the corundum into a well-type furnace, heating to 450 ℃ at a heating rate of 5 ℃/min, preserving heat for 1.5 h, heating to 950 ℃ at a heating rate of 3.5 ℃/min, preserving heat for 4 h, naturally cooling the gear grinding wheel in an electric furnace after closing the furnace, opening a furnace door for cooling when the furnace temperature is lower than 150 ℃, and taking the gear grinding wheel out of the box bowl when the temperature is lower than 70 ℃ to obtain a finished product of the gear grinding wheel.
By further using the ground gear tooth bottoms prepared in examples 2 to 4, high surface smoothness was obtained, and no workpiece burn occurred.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The self-lubricating gear grinding wheel is characterized by being prepared from the following raw materials in parts by weight:
12 ~ 20 parts of ceramic bond, 70 ~ 100 parts of zirconia alumina, 5 ~ 8 parts of silicon carbide, 3 ~ 5 parts of yellow dextrin and 2 ~ 3 parts of water.
2. The self-lubricating gear grinding wheel according to claim 1, wherein the ceramic bond is prepared from the following raw materials in parts by weight:
15 ~ 30 parts of boron glass powder, 5 ~ 10 parts of alkali-free glass powder, 20 ~ 30 parts of spodumene powder, 30 ~ 50 parts of kaolin and 5 ~ 10 parts of bauxite.
3. The self-lubricating gear grinding wheel of claim 1, wherein the silicon carbide is cubic silicon carbide.
4. A method for preparing a self-lubricating gear grinding wheel according to any one of claims 1 to 3, characterized in that it comprises the following steps:
Preparing materials, namely weighing and uniformly mixing the preparation raw materials of the gear grinding wheel according to the formula ratio to prepare a gear grinding wheel blank;
Molding, namely pressing and molding the grinding wheel blank to obtain a grinding wheel blank;
And sintering, namely sintering the grinding wheel blank to obtain the gear grinding wheel.
5. the preparation method of claim 4, wherein in the step of compounding, raw materials for preparing the grinding wheel are mixed in a ball mill, wherein a ball grinding stone of the ball mill is corundum balls, the ball-material ratio is 1:1, the diameter of the ball grinding stone is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 ~ 80 rpm, and the ball milling time is 1 ~ 2 h.
6. The method of claim 4, wherein the ceramic binder is prepared in advance in the step of compounding, and the method of preparing the ceramic binder comprises the steps of:
Weighing ceramic bond raw materials according to the formula ratio, and mixing the raw materials by a ball mill, wherein the ball grinding stones of the ball mill are corundum balls, the ball-material ratio is 1:1, the diameter of the ball grinding stones is 2 cm, the diameter of a ball milling jar is 500mm, the rotating speed is 50 ~ 80 rpm, and the ball milling time is 1 ~ 2 h.
7. The manufacturing method according to claim 4, characterized in that in the molding step, the molding pressure of the grinding wheel blank is 50 ~ 70 MPa, and the molding dwell time is 0.5 ~ 2 min.
8. The method for producing according to claim 7, characterized by further comprising, after the molding step, the steps of:
And (3) drying, namely, after the gear grinding wheel green body is placed at room temperature for 22 ~ 26 h, drying at 60 ~ 70 ℃ for 10 ~ 14 h.
9. The preparation method according to any one of claims 4 to 8, wherein in the sintering step, during the sintering process, the temperature is raised to 400 ~ 500 ℃ at a rate of 4 ~ 6 ℃/min, the temperature is kept for 1 ~ 2h, then the temperature is raised to 900 ~ 1000 ℃ at a rate of 3 ~ 4 ℃/min, the temperature is kept for 3 ~ 5 h, and then the mixture is naturally cooled.
10. The method according to claim 9, wherein the sintering is sand-burying sintering or vacuum sintering.
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