CN112692226A - Hot core box resin sand and resin sand core comprising same - Google Patents
Hot core box resin sand and resin sand core comprising same Download PDFInfo
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- CN112692226A CN112692226A CN202011428385.3A CN202011428385A CN112692226A CN 112692226 A CN112692226 A CN 112692226A CN 202011428385 A CN202011428385 A CN 202011428385A CN 112692226 A CN112692226 A CN 112692226A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/224—Furan polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
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- Mold Materials And Core Materials (AREA)
Abstract
The invention provides hot core box resin sand and a resin sand core comprising the same, wherein the hot core box resin sand comprises silica sand, mixed resin, a curing agent and a release agent, and the mixed resin comprises resin A and resin B; wherein, the content of the mixed resin is 1 to 2.5 percent based on the total weight of the hot core box resin sand as 100 percent; the content P2 of the resin A meets the formula I, and the content P1 of the curing agent meets the formula II, wherein the total weight of the mixed resin is 100 percent: p2 ═ C1- (Rh × 100-C2) × 40/C2)/100 × 100%, formula i; p1 ═ ((562-3Te)/2000) × 100%, formula ii. The invention also provides a resin sand core containing the hot core box resin sand, the hot core box resin sand is filled into the hot core box, and the resin sand core is obtained after the hot core box is heated. The component content of the hot core box resin sand is determined according to the environmental temperature and humidity, so that the surface quality of the sand core is improved, the problems of moisture absorption and surface shakeout of the sand core are solved, and the casting quality is improved.
Description
Technical Field
The invention belongs to the technical field of casting materials, and particularly relates to hot core box resin sand capable of improving the surface strength of a sand core and a resin sand core containing the same.
Background
At present, the hot core box resin sand is widely applied to low-pressure casting in the bathroom industry. The hot box resin sand generally contains casting silica sand, furan resin, a curing agent and a release agent. In the casting production process, the prepared resin sand mixture is blown and filled into a hot core box, and the resin sand core with complete outline is formed after heating and curing. However, in actual production processes, more than 60% of defects in the resulting casting are related to the quality of the resin sand core.
Due to different production environment temperatures and humidity, although the resin sand with the same formula also needs to continuously adjust the technological parameters for producing the sand core, such as heating temperature, time and the like, so as to ensure the quality of the sand core, such as strength and the like; meanwhile, the fixed resin sand formula is easy to cause moisture absorption and surface shakeout of the resin sand core in a high-temperature and high-humidity environment, so that the defects of air holes or sand holes on the surface of a casting and the like are caused.
Disclosure of Invention
In view of the above, the invention provides hot-box resin sand and a resin sand core containing the same, wherein the contents of a resin A and a curing agent in the hot-box resin sand are determined according to the temperature and the relative humidity of a production environment, so that the surface quality of the obtained sand core is improved, the problems of moisture absorption, surface sand falling and the like of the sand core in a high-temperature and high-humidity environment are solved, and the quality of the sand core and a casting is also improved.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a hot-box resin sand, which comprises silica sand, mixed resin, a curing agent and a release agent, wherein the mixed resin comprises a resin A and a resin B;
wherein the total weight of the hot core box resin sand is 100%, and the percentage content of the mixed resin is 1% -2.5%;
the percentage content P2 of the resin A meets the following formula I, and the percentage content P1 of the curing agent meets the following formula II, wherein the total weight of the mixed resin is 100 percent:
in formula I, C1 is 35; c2 ═ 55; rh is relative humidity of production environment, and is preferably 45-75%;
in formula II, Te is the temperature of the production environment, preferably 10 ℃ to 40 ℃.
In the hot box resin sand of the present invention, the amounts of the resin A, the resin B and the curing agent are determined by the relative humidity (Rh) and the temperature (Te) of the production environment, i.e., the specific proportion of the curing agent in the resin sand is determined by the temperature of the production environment according to formula II, and the specific proportion of the resin A in the mixed resin is determined by the relative humidity of the production environment according to formula I. The hot core box resin sand avoids the problem of surface quality of the resin sand core caused by condition change, saves the adjustment of the process parameters for preparing the sand core, and is convenient for operators to operate; meanwhile, the surface quality of the resin sand core is stabilized, the problem of sand core moisture absorption and sand falling under a high-temperature and high-humidity environment is solved, and the quality of the sand core and a casting is improved.
In some embodiments, the silica sand is present in an amount of 97.5 wt% to 98.5 wt%, such as 97.8 wt%, 98.0 wt%, and 98.2 wt%, based on 100 wt% of the hot box resin sand.
In some embodiments, the weight percentage of the mixed resin is 1 to 2.5%, for example, 1.2%, 1.6%, based on the total weight of the mixed resin being 100%.
In the present invention, resin a is selected from urea-formaldehyde-furfuryl alcohol furan and/or urea-formaldehyde-furfuryl alcohol furan; the resin B is selected from phenolic aldehyde-furfuryl alcohol furan and/or urea aldehyde-furfuryl alcohol furan; as well known to those skilled in the art, the above mentioned resins such as urea-formaldehyde-furfuryl alcohol furan can be classified into liquid urea-formaldehyde-furfuryl alcohol furan, powdered urea-formaldehyde-furfuryl alcohol furan, etc. according to the existence of different physical and chemical properties such as viscosity, molecular weight, functional group, etc. The mixed resin mentioned in the invention is obtained by mixing resins with different physical and chemical properties. In some specific embodiments, resin A of the present invention may be JC689 produced by Seikagai corporation, and resin B may be HB031 produced by Shanghai Europe.
In the invention, the silica sand has a particle size distribution of 40/70 meshes or 50/100 meshes. According to the scheme of the invention, the '40/70 meshes' and the '50/100 meshes' respectively represent that the granularity of the used silica sand is concentrated between 40 meshes and 70 meshes and between 50 meshes and 100 meshes. In some specific embodiments, the 40/70-mesh silica sand is selected from silica sand available from Tongliaodalin sand works under the trade designation "ZGS 96-40/70"; the 50/100-mesh silica sand can be selected from silica sand manufactured by Tongliaodalin sand factory under the brand name of ZGS 90-50/100.
In the present invention, the content of the release agent is 20% to 30%, for example, 25%, 28% of the content of the curing agent.
The hot core box resin sand provided by the invention can be prepared by adopting the following method: (1) mixing the resin A and the resin B to obtain the mixed resin for later use;
(2) and after mixing the silica sand and the curing agent, adding the mixed resin into the silica sand, mixing, and then continuously adding the release agent to obtain the hot core box resin sand.
In some embodiments of the above method, the resin mixture is obtained by mixing and stirring the resin a and the resin B for 4 to 6 hours in step (1); and (3) mixing and stirring the silica sand and the curing agent in the step (2) for 2-4 minutes, adding the mixed resin into the mixture, mixing the mixture for 2-3 minutes, continuously adding the release agent, and mixing the mixture for 1-3 minutes to obtain the hot box resin sand.
The second aspect of the invention provides a hot core box resin sand core, wherein the hot core box resin sand is filled into a hot core box, and then the hot core box is heated to obtain the resin sand core;
in some specific application processes, a hot core box is fixed on a hot core box sand core machine, the machine is adjusted, whether a staggered die or an expanded die exists or not is checked, the hot core box is preheated at about 240 ℃ after sand blowing holes are aligned, and then the obtained hot core box resin sand is added into a sand storage hopper of the sand core machine. After the hot core box sand core machine is started to work, blowing sand into a hot core box by using resin sand under the pressure of 4-6 kg, and heating and curing at the temperature of 210-250 ℃ for 25-35 seconds to form the resin sand core with a complete profile and certain strength.
By adopting the technical scheme, the method has the following technical effects:
in the hot core box resin sand provided by the invention, the dosage of the specific components of the resin A, the resin B and the curing agent is determined by the relative humidity (Rh) and the temperature (Te) of the production environment, so that the problem of moisture absorption and sand falling of the resin sand core in the application process caused by different production environments is solved, the surface quality of the formed casting is improved, and the yield of the casting is further improved.
Detailed Description
In order to better understand the present invention, the following examples are provided to further illustrate the content of the present invention.
The conditions of air holes or sand holes on the surface of the casting obtained in the following examples are detected, and the following method is specifically adopted:
grinding the surface of the obtained casting by adopting abrasive belts of 80#, 240#, 400# and 800#, and then polishing and clearing by using a cloth wheel; then, under the illumination of 150 candlepower feet, an inspector (more than 1.0 of naked eye vision) checks whether small sand holes exist on the surface of the casting within the range of 50 cm-60 cm away from the casting. And (3) obtaining the proportion of the air holes or the sand holes on the surface of the castings of the same batch by taking the detection of 12 ten thousand castings of the same batch as a base number.
Example 1
(1) In this example, Rh (relative humidity of the production environment) was 48.1%, Te (temperature of the production environment) was 14.3 ℃; substituting the resin into a formula I and a formula II to obtain a resin A with the weight percentage of P2 being 40 percent and a curing agent with the weight percentage of P1 being 26 percent;
in this embodiment, the amounts of the components and the raw material information of the hot box resin sand are as follows:
| name of raw materials | Quality (g) | Number plate | Raw materials supplier |
| Resin A | 640 | JC689 | Jiangxi Ganzhou Jingchuang Co Ltd |
| Resin B | 960 | HB031 | Chemical industry of Shanghai Europe |
| Silica sand | 100000 | ZGS96-40/70 | Tongliao Dalin sand plant |
| Curing agent | 416 | AT 7 | Chemical industry of Shanghai Europe |
| Release agent | 104 | KONSVER | Chemical industry of Shanghai Europe |
(2) According to the dosage of each component in the table, the hot box resin sand core is prepared according to the following method: mixing and stirring the resin A and the resin B for 6 hours to obtain mixed resin; and then mixing and stirring the silica sand and a curing agent for 4 minutes, adding the obtained mixed resin into the mixture, mixing the mixture for 2 minutes, continuously adding a release agent into the mixture, and mixing the mixture for 1 minute to obtain hot box resin sand 1 for later use.
Example 2
(1) In this example, Rh (relative humidity of the production environment) was 54.2%, Te (temperature of the production environment) was 25.5 ℃; substituting the resin into a formula I and a formula II to obtain a resin A with the weight percentage of P2 being 35.6 percent and a curing agent with the weight percentage of P1 being 24.3 percent;
in this embodiment, the mass and raw material information of each component of the hot box resin sand are as follows:
| name of raw materials | Quality (g) | Number plate | Raw materials supplier |
| Resin A | 498.4 | JC689 | Jiangxi Ganzhou Jingchuang Co Ltd |
| Resin B | 901.6 | HB031 | Chemical industry of Shanghai Europe |
| Silica sand | 100000 | ZGS96-40/70 | Tongliao Dalin sand plant |
| Curing agent | 340.2 | AT7 | Chemical industry of Shanghai Europe |
| Release agent | 80.05 | KONSVER | Chemical industry of Shanghai Europe |
(2) According to the dosage of each component in the table, the hot box resin sand core is prepared according to the following method: mixing and stirring the resin A and the resin B for 6 hours to obtain mixed resin; and then mixing and stirring the silica sand and a curing agent for 4 minutes, adding the obtained mixed resin into the mixture, mixing the mixture for 2 minutes, continuously adding a release agent, and mixing the mixture for 1 minute to obtain hot box resin sand 2 for later use.
Example 3
(1) In this example, Rh (relative humidity of the production environment) was 60.3%, Te (temperature of the production environment) was 31.2 ℃; substituting the resin into a formula I and a formula II to obtain a resin A with the weight percentage of P2 being 31.1 percent and a curing agent with the weight percentage of P1 being 23.4 percent;
in this embodiment, the mass and raw material information of each component of the hot box resin sand are as follows:
| name of raw materials | Quality (g) | Number plate | Raw materials supplier |
| Resin A | 499.2 | JC689 | Jiangxi Ganzhou Jingchuang Co Ltd |
| Resin B | 1100.8 | HB031 | Chemical industry of Shanghai Europe |
| Silica sand | 100000 | ZGS90-50/100 | Tongliao Dalin sand plant |
| Curing agent | 374.4 | AT7 | Chemical industry of Shanghai Europe |
| Release agent | 93.6 | KONSVER | Chemical industry of Shanghai Europe |
(2) According to the dosage of each component in the table, the hot box resin sand core is prepared according to the following method: mixing and stirring the resin A and the resin B for 6 hours to obtain mixed resin; and then mixing and stirring the silica sand and a curing agent for 4 minutes, adding the obtained mixed resin into the mixture, mixing the mixture for 2 minutes, continuously adding a release agent into the mixture, and mixing the mixture for 1 minute to obtain hot box resin sand 3 for later use.
Example 4
(1) In this example, Rh (relative humidity of the production environment) was 43.4%, Te (temperature of the production environment) was 30.4 ℃; substituting the resin into a formula I and a formula II to obtain a resin A with the weight percentage of P2-43.4 percent and a curing agent with the weight percentage of P1-23.5 percent;
in this embodiment, the mass and raw material information of each component of the hot box resin sand are as follows:
| name of raw materials | Quality (g) | Number plate | Raw materials supplier |
| Resin A | 694.4 | JC689 | Jiangxi Ganzhou Jingchuang Co Ltd |
| Resin B | 905.6 | HB031 | Chemical industry of Shanghai Europe |
| Silica sand | 100000 | ZGS96-40/70 | Tongliao Dalin sand plant |
| Curing agent | 376 | AT7 | Chemical industry of Shanghai Europe |
| Release agent | 94 | KONSVER | Chemical industry of Shanghai Europe |
(2) According to the dosage of each component in the table, the hot box resin sand core is prepared according to the following method: mixing and stirring the resin A and the resin B for 6 hours to obtain mixed resin; and then mixing and stirring the silica sand and a curing agent for 4 minutes, adding the obtained mixed resin into the mixture, mixing the mixture for 2 minutes, continuously adding a release agent, and mixing the mixture for 1 minute to obtain hot box resin sand 4 for later use.
Example 5
(1) In this example, Rh (relative humidity of the production environment) was 53.3%, Te (temperature of the production environment) was 21.4 ℃; substituting the resin into a formula I and a formula II to obtain a resin A with the weight percentage of P2 being 36.2 percent and a curing agent with the weight percentage of P1 being 24.9 percent;
in this embodiment, the mass and raw material information of each component of the hot box resin sand are as follows:
| name of raw materials | Quality (g) | Number plate | Raw materials supplier |
| Resin A | 579.2 | JC689 | Jiangxi Ganzhou Jingchuang Co Ltd |
| Resin B | 1020.8 | HB031 | Chemical industry of Shanghai Europe |
| Silica sand | 100000 | ZGS96-40/70 | Tongliao Dalin sand plant |
| Curing agent | 398.4 | AT7 | Chemical industry of Shanghai Europe |
| Release agent | 99.6 | KONSVER | Chemical industry of Shanghai Europe |
(2) According to the dosage of each component in the table, the hot box resin sand core is prepared according to the following method: mixing and stirring the resin A and the resin B for 6 hours to obtain mixed resin; and then mixing and stirring the silica sand and a curing agent for 4 minutes, adding the obtained mixed resin into the mixture, mixing the mixture for 2 minutes, continuously adding a release agent, and mixing the mixture for 1 minute to obtain hot box resin sand 5 for later use.
Comparative example 1
This comparative example differs from example 1 in that: the weight percentage content of the resin A is P2-44%, the weight percentage content of the curing agent is P1-23%, and the hot box resin sand 1-1 is prepared for standby.
Comparative example 2
This comparative example differs from example 2 in that: the weight percentage content of the resin A is P2-44%, the weight percentage content of the curing agent is P1-23%, and the hot box resin sand 2-1 is prepared for standby.
Comparative example 3
This comparative example differs from example 3 in that: the weight percentage content of the resin A is P2-44%, the weight percentage content of the curing agent is P1-23%, and the hot box resin sand 3-1 is prepared for standby.
Comparative example 4
This comparative example differs from example 4 in that: the weight percentage content of the resin A is P2-44%, the weight percentage content of the curing agent is P1-23%, and the hot box resin sand 4-1 is prepared for standby.
Comparative example 5
This comparative example differs from example 5 in that: the weight percentage content of the resin A is P2-44%, the weight percentage content of the curing agent is P1-23%, and the hot box resin sand 5-1 is prepared for standby.
Filling the prepared hot core box resin sand 1 into a hot core box under the pressure of 4kg, heating the hot core box at 220 ℃, and curing for 30 seconds to form a complete resin sand core 1; and (3) processing other hot core box resin sand 2-5-1 to obtain a resin sand core 2-5-1 correspondingly.
And (3) forming a low-pressure copper casting by using the obtained hot core box resin sand core, and carrying out the detection on the surface performance of the casting, wherein the specific result is shown in the following table 1.
TABLE 1
In the hot core box resin sand 1-5, the dosage of the resin A, the resin B and the curing agent is calculated by the formulas I and II, namely, the components of the hot core box resin sand are determined by the relative humidity (Rh) and the temperature (Te) of the production environment, so that the problem of the surface quality of the resin sand core caused by the change of the production environment condition is avoided. From the data in the table, compared with a comparative example without considering the influence of production environment factors, the proportion of air holes or sand holes on the surface of the casting prepared from the hot core box resin sand 1-5 is reduced by 0.5-2.9%, the problems of sand falling and the like caused by moisture absorption of the sand core in a high-temperature and high-humidity environment are solved, and the surface performance of the casting is improved.
Finally, it should be noted that the above-mentioned embodiments only illustrate the preferred embodiments of the present invention, and do not limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications can be made by modifying the technical solution of the present invention or equivalent substitutions within the scope of the present invention defined by the claims.
Claims (9)
1. The hot box resin sand is characterized by comprising silica sand, mixed resin, a curing agent and a release agent, wherein the mixed resin comprises a resin A and a resin B;
wherein the percentage content of the mixed resin is 1-2.5% by taking the total weight of the hot core box resin sand as 100%;
the percentage content P2 of the resin A meets the following formula I, and the percentage content P1 of the curing agent meets the following formula II, wherein the total weight of the mixed resin is 100 percent:
in the formula I, C1 is 35, C2 is 55; rh is relative humidity of production environment, and is preferably 45-75%;
in formula II, Te is the temperature of the production environment, preferably 10 ℃ to 40 ℃.
2. The hot-box resin sand as claimed in claim 1, wherein the silica sand accounts for 97.5-98.5 wt% of the total weight of the hot-box resin sand being 100%.
3. The hot box resin sand according to claim 1 or 2, characterized in that the resin a is selected from urea-formaldehyde-furfuryl alcohol furan and/or urea-phenol-formaldehyde-furfuryl alcohol furan;
the resin B is selected from phenolic aldehyde-furfuryl alcohol furan and/or urea aldehyde-furfuryl alcohol furan.
4. The hot box resin sand of claim 3, wherein the silica sand has a particle size distribution of 40/70 mesh or 50/100 mesh.
5. The hot box resin sand as claimed in claim 4, wherein the content of the release agent is 20-30% of the content of the curing agent.
6. The hot-box resin sand as claimed in any one of claims 1 to 5, wherein the hot-box resin sand is prepared by the following method:
(1) mixing the resin A and the resin B to obtain the mixed resin for later use;
(2) and after mixing the silica sand and the curing agent, adding the mixed resin into the silica sand, mixing, and then continuously adding the release agent to obtain the hot core box resin sand.
7. The hot box resin sand as claimed in claim 6, wherein in the step (1), the resin A and the resin B are mixed and stirred for 4-6 hours to obtain the mixed resin;
in the step (2), after the silica sand and the curing agent are mixed and stirred for 2-4 minutes, adding the mixed resin into the silica sand and mixing the mixture for 2-3 minutes, and continuously adding the release agent and mixing the mixture for 1-3 minutes to obtain the hot box resin sand.
8. A hot-box resin sand core, which is characterized in that the hot-box resin sand as claimed in any one of claims 1 to 7 is filled into a hot box, and then the hot box is heated to obtain the resin sand core.
9. The hot-box resin sand core as claimed in claim 8, wherein the hot-box resin sand is charged into the hot-box under a pressure of 4 to 6kg and heated at 210 to 250 ℃ for 25 to 35 seconds.
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