CN110170612B - Method for improving fluidity of inorganic resin molding sand and application method thereof - Google Patents
Method for improving fluidity of inorganic resin molding sand and application method thereof Download PDFInfo
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- CN110170612B CN110170612B CN201910449069.5A CN201910449069A CN110170612B CN 110170612 B CN110170612 B CN 110170612B CN 201910449069 A CN201910449069 A CN 201910449069A CN 110170612 B CN110170612 B CN 110170612B
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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
- 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
- B22C1/18—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 inorganic agents
- B22C1/185—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 inorganic agents containing phosphates, phosphoric acids or its derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to the technical field of inorganic resin molding sand casting, in particular to a method for improving the fluidity of inorganic resin molding sand and an application method thereof, wherein the method for improving the fluidity of the inorganic resin molding sand comprises the steps of adding an inorganic binder accounting for 2-5% of the total weight of the inorganic resin molding sand into the inorganic resin molding sand for sand mixing, then adding a silane coupling agent accounting for 0.3-0.8% of the total weight of the inorganic resin molding sand for continuous sand mixing, and finally introducing hot air for drying to remove the water in the inorganic binder to prepare dry-state coated sand. According to the method for improving the fluidity of the inorganic resin type sand, the inorganic binder is attached to the surface of the sand, hot air is introduced to dry the binder, and dry precoated sand is obtained, so that the fluidity of the sand is greatly improved, and convenience is provided for subsequent sand shooting and forming. The application method of the method for improving the fluidity of the inorganic resin molding sand greatly reduces the total liquid amount, thereby greatly improving the fluidity of the sand and facilitating the sand shooting and filling to obtain the compact sand core.
Description
Technical Field
The invention relates to the technical field of inorganic resin molding sand casting, in particular to a method for improving the fluidity of inorganic resin molding sand and an application method thereof.
Background
When the inorganic resin molding sand is used, a binder and an auxiliary material are added, the binder and the auxiliary material are liquid components, and the liquid components are added into the sand to influence the fluidity of the sand, so that the complex corners of the sand core cannot be completely filled during core shooting.
In order to solve the problems, the invention provides a method for improving the fluidity of inorganic resin molding sand and a sand sample preparation method thereof.
Disclosure of Invention
One of the objects of the present invention is to provide a method for improving the fluidity of inorganic resin molding sand, which greatly improves the fluidity of the sand.
The invention also aims to provide an application method of the method for improving the fluidity of the inorganic resin molding sand, which greatly improves the fluidity of the sand and is convenient for shooting and filling the sand to obtain a compact sand core.
The scheme adopted by the invention for realizing one of the purposes is as follows: a method for improving the flowability of inorganic resin type sand includes such steps as mixing inorganic resin with 2-5 wt% of sand, adding silane coupling agent (0.3-0.8 wt%) of sand, and hot air drying to remove water.
More preferably, the silane coupling agent accounts for 0.6% of the total weight of the inorganic resin molding sand.
Preferably, the inorganic binder is a phosphate binder.
Preferably, the phosphate binder comprises the following components in percentage by weight: 60 to 63 percent of industrial phosphoric acid, 13 to 15 percent of aluminum hydroxide, 1.8 to 3 percent of boric acid, 0.5 to 1 percent of citric acid, 0.6 to 0.8 percent of silicic acid, 1.3 to 1.6 percent of magnesium oxide, 0.6 to 0.8 percent of zinc oxide, 0.08 to 0.10 percent of copper oxide, 0.08 to 0.10 percent of yttrium oxide and the balance of water.
Preferably, the phosphate binder comprises the following components in percentage by weight: 61.62% industrial phosphoric acid, 14.14% aluminum hydroxide, 2.19% boric acid, 0.73% citric acid, 0.73% silicic acid, 1.46% magnesium oxide, 0.73% zinc oxide, 0.09% copper oxide, 0.09% yttrium oxide, and the balance of water.
Preferably, the preparation method of the phosphate binder comprises the following steps: (1) heating industrial phosphoric acid to boiling, adding powdery aluminum hydroxide under a stirring state, and continuously heating until uniform and transparent reactants are obtained;
(2) adding boric acid into the transparent reactant obtained in the step (1), heating and stirring to obtain a transparent solution;
(3) adding silicic acid into the transparent solution obtained in the step (2), heating and stirring to obtain a transparent solution;
(4) adding magnesium oxide into the transparent solution obtained in the step (3) while stirring to obtain a transparent solution;
(5) adding zinc oxide into the transparent solution obtained in the step (4), and stirring while adding until a transparent solution is obtained;
(6) adding citric acid into the transparent solution obtained in the step (5) while stirring to obtain a transparent solution;
(7) adding yttrium oxide into the transparent solution obtained in the step (6) while stirring to obtain a transparent solution;
(8) and (3) adding copper oxide into the transparent solution obtained in the step (7), and stirring while adding until a transparent solution is obtained, namely the phosphate inorganic binder.
Preferably, the silane coupling agent is KH 550.
Preferably, the temperature of the hot air is 80-100 ℃.
The second scheme adopted by the invention for achieving the purpose is as follows: the method for improving the fluidity of the inorganic resin type sand is used for preparing a sand sample, and comprises the following steps: (1) adding inorganic binder sand accounting for 2-5% of the total weight of the inorganic resin molding sand into the inorganic resin molding sand;
(2) adding silane coupling agent according to 0.3-0.8% of the total weight of the inorganic resin molding sand after mixing for continuously mixing for 60-120 s;
(3) drying the molding sand mixed in the step (2) by using hot air at the temperature of 80-100 ℃, wherein the dried molding sand is in a loose sand shape;
(4) dispersing the molding sand in the step (3) by screening, adding citric acid aqueous solution accounting for 0.6-1.2% of the total weight of the inorganic resin molding sand, uniformly mixing, and performing sand shooting molding;
(5) and after sand shooting, introducing dried air to solidify and form the sand sample to obtain the sand sample.
Preferably, in the step (4), the mass concentration of the citric acid aqueous solution is 50 wt%.
Preferably, in the step (4), the sand shooting and forming are carried out through a core shooting machine, and the temperature of a core shooting machine mold is 50-80 ℃.
According to the method for improving the fluidity of the inorganic resin type sand, the inorganic binder is attached to the surface of the sand, hot air is introduced to dry the binder, and dry precoated sand is obtained, so that the fluidity of the sand is greatly improved, and convenience is provided for subsequent sand shooting and forming.
The application method of the method for improving the fluidity of the inorganic resin molding sand comprises the steps of sieving the obtained dry precoated sand to obtain loose sand, adding a liquid auxiliary material citric acid aqueous solution when the method is used, and removing the water in the inorganic binder in the dry precoated sand before extraction, wherein the amount of the adopted liquid auxiliary material is small, so that the total liquid amount is greatly reduced, the fluidity of the sand is greatly improved, and the sand shooting and filling are facilitated to obtain a compact sand core; in addition, the water in the liquid auxiliary material enables the solid binder on the surface of the sand grains to be liquefied again, so that the sand grains are connected with each other, and due to the catalytic action of the auxiliary material, the sand core is solidified through sand shooting and forming and dehydration, and the sand sample is prepared.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
Example 1
A preparation method of a sand sample comprises the following steps:
1. weighing 2000g of raw sand and 50g of inorganic phosphate binder for later use;
2. adding raw sand and an inorganic phosphate binder into a stirrer, stirring for 120S, adding KH550 into the raw sand according to 0.6 percent of the mass of the raw sand after mixing, and continuously mixing for 90S;
3. after the sand mixing is finished, introducing hot air at 90 ℃ while stirring, and drying for 25 min;
4. obtaining dry precoated sand after drying, and screening, sealing and storing for later use;
5. adding 12g of citric acid aqueous solution with the mass concentration of 50 wt% into the dry precoated sand, mixing the sand for 90 seconds, and shooting the sand by using a core shooter at the mold temperature of 70 ℃;
6. introducing compressed air for 1 minute, and curing and molding;
7. and opening the mold and taking out the sand core to obtain the product.
The phosphate binder comprises the following components in percentage by weight: 61.62% industrial phosphoric acid, 14.14% aluminum hydroxide, 2.19% boric acid, 0.73% citric acid, 0.73% silicic acid, 1.46% magnesium oxide, 0.73% zinc oxide, 0.09% copper oxide, 0.09% yttrium oxide, and the balance of water.
Example 2
A preparation method of a sand sample comprises the following steps:
1. weighing 2000g of raw sand and 40g of inorganic phosphate binder for later use;
2. adding raw sand and an inorganic phosphate binder into a stirrer, stirring for 120S, adding KH550 into the raw sand according to 0.3 percent of the mass of the raw sand after mixing, and continuously mixing for 90S;
3. after the sand mixing is finished, introducing hot air at 80 ℃ while stirring, and drying for 30 min;
4. obtaining dry precoated sand after drying, and screening, sealing and storing for later use;
5. adding 16g of citric acid aqueous solution with the mass concentration of 50 wt% into the dry precoated sand, mixing the sand for 90 seconds, and shooting the sand by using a core shooting machine, wherein the temperature of a mold is 50 ℃;
6. introducing compressed air for 1 minute, and curing and molding;
7. and opening the mold and taking out the sand core to obtain the product.
The phosphate binder comprises the following components in percentage by weight: 61.62% industrial phosphoric acid, 14.14% aluminum hydroxide, 2.19% boric acid, 0.73% citric acid, 0.73% silicic acid, 1.46% magnesium oxide, 0.73% zinc oxide, 0.09% copper oxide, 0.09% yttrium oxide, and the balance of water.
Example 3
A preparation method of a sand sample comprises the following steps:
1. weighing 2000g of raw sand and 60g of inorganic phosphate binder for later use;
2. adding raw sand and an inorganic phosphate binder into a stirrer, stirring for 120S, adding KH550 into the raw sand according to 0.8 percent of the mass of the raw sand after mixing, and continuously mixing for 90S;
3. after the sand mixing is finished, introducing hot air at 100 ℃ while stirring, and drying for 20 min;
4. obtaining dry precoated sand after drying, and screening, sealing and storing for later use;
5. adding 18g of citric acid aqueous solution with the mass concentration of 50 wt% into the dry precoated sand, mixing the sand for 90 seconds, and shooting the sand by using a core shooter at the mold temperature of 70 ℃;
6. introducing compressed air for 2 minutes, and curing and forming;
7. and opening the mold and taking out the sand core to obtain the product.
The phosphate binder comprises the following components in percentage by weight: 61.62% industrial phosphoric acid, 14.14% aluminum hydroxide, 2.19% boric acid, 0.73% citric acid, 0.73% silicic acid, 1.46% magnesium oxide, 0.73% zinc oxide, 0.09% copper oxide, 0.09% yttrium oxide, and the balance of water.
Example 4
A preparation method of a sand sample comprises the following steps:
1. weighing 2000g of raw sand and 100g of inorganic phosphate binder for later use;
2. adding raw sand and an inorganic phosphate binder into a stirrer, stirring for 120S, adding KH550 into the raw sand according to 0.6 percent of the mass of the raw sand after mixing, and continuously mixing for 90S;
3. after the sand mixing is finished, introducing hot air with the temperature of 85 ℃ while stirring, and drying for 30 min;
4. obtaining dry precoated sand after drying, and screening, sealing and storing for later use;
5. adding 24g of citric acid aqueous solution with the mass concentration of 50 wt% into the dry precoated sand, mixing the sand for 90 seconds, and shooting the sand by using a core shooter at the mold temperature of 80 ℃;
6. introducing compressed air for 2 minutes, and curing and forming;
7. and opening the mold and taking out the sand core to obtain the product.
The phosphate binder comprises the following components in percentage by weight: 61.62% industrial phosphoric acid, 14.14% aluminum hydroxide, 2.19% boric acid, 0.73% citric acid, 0.73% silicic acid, 1.46% magnesium oxide, 0.73% zinc oxide, 0.09% copper oxide, 0.09% yttrium oxide, and the balance of water.
Comparative example
A preparation method of a sand sample comprises the following steps:
1. weighing 2000g of raw sand and 50g of inorganic phosphate binder for later use;
2. adding raw sand and an inorganic phosphate binder into a stirrer, stirring for 120S, adding KH550 into the raw sand according to 0.6 percent of the mass of the raw sand after mixing, and continuously mixing for 90S;
3. adding 12g of citric acid aqueous solution with the mass concentration of 50 wt% while stirring, sand mulling for 90S, and then shooting sand by using a core shooting machine, wherein the temperature of a mold is 70 ℃;
6. introducing compressed air for 5 minutes, and curing and forming;
7. and opening the mold and taking out the sand core to obtain the product.
The phosphate binder comprises the following components in percentage by weight: 61.62% industrial phosphoric acid, 14.14% aluminum hydroxide, 2.19% boric acid, 0.73% citric acid, 0.73% silicic acid, 1.46% magnesium oxide, 0.73% zinc oxide, 0.09% copper oxide, 0.09% yttrium oxide, and the balance of water.
The experimental test results are as follows:
the molding sand prepared in the embodiments 1 to 4 and the comparative example is prepared into a standard 8-shaped sample by a core shooter, compressed air is respectively introduced for 1min, 2min and 5min, and after the sample is completely hardened, the tensile strength is measured according to a GB/T2684-2009 casting sand and mixture test method. The results are shown in the following table:
from the data in the above table, it can be seen that the average tensile strength of the samples prepared in examples 1 to 4 of the present invention is greatly improved, and the average volume of the sand sample is high, which indirectly indicates that the sand has good fluidity, and the sand core with high density can be made by injection, and because the total amount of liquid in the raw sand is greatly reduced, the sand sample is fast in hardening and drying speed, and the demolding time is shortened. Examples 1 and 2 compared with examples 3 and 4, the strength was lower than the latter because the hardening time was 1min, the complete hardening blow time was 2min according to the invention, and the comparative example required 5 min.
In conclusion, the application method of the method for improving the fluidity of the inorganic resin molding sand, disclosed by the invention, is characterized in that the obtained dry precoated sand is sieved to obtain loose sand, and a liquid auxiliary material citric acid aqueous solution is added in the loose sand during use; in addition, the water in the liquid auxiliary material enables the solid binder on the surface of the sand grains to be liquefied again, so that the sand grains are connected with each other, and due to the catalytic action of the auxiliary material, the sand core is solidified through sand shooting and forming and dehydration, and the sand sample is prepared.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (6)
1. A method for improving the fluidity of inorganic resin molding sand is characterized in that: adding inorganic binder accounting for 2-5% of the total weight of the inorganic resin molding sand into the inorganic resin molding sand for sand mixing, then adding silane coupling agent accounting for 0.3-0.8% of the total weight of the inorganic resin molding sand for continuous sand mixing, and finally introducing hot air for drying and removing water in the inorganic binder to prepare dry precoated sand; the inorganic binder is a phosphate binder; the phosphate binder comprises the following components in percentage by weight: 60 to 63 percent of industrial phosphoric acid, 13 to 15 percent of aluminum hydroxide, 1.8 to 3 percent of boric acid, 0.5 to 1 percent of citric acid, 0.6 to 0.8 percent of silicic acid, 1.3 to 1.6 percent of magnesium oxide, 0.6 to 0.8 percent of zinc oxide, 0.08 to 0.10 percent of copper oxide, 0.08 to 0.10 percent of yttrium oxide and the balance of water; the silane coupling agent is KH 550.
2. The method for improving fluidity of inorganic resin molding sand as claimed in claim 1, wherein: the phosphate binder comprises the following components in percentage by weight: 61.62% industrial phosphoric acid, 14.14% aluminum hydroxide, 2.19% boric acid, 0.73% citric acid, 0.73% silicic acid, 1.46% magnesium oxide, 0.73% zinc oxide, 0.09% copper oxide, 0.09% yttrium oxide, and the balance of water.
3. The method for improving fluidity of inorganic resin molding sand as claimed in claim 1, wherein: the temperature of the hot air is 80-100 ℃.
4. A method of using the method for improving fluidity of inorganic resin molding sand according to any one of claims 1 to 3, for preparing a sand sample by the method for improving fluidity of inorganic resin molding sand, comprising the steps of: (1) adding inorganic binder sand accounting for 2-5% of the total weight of the inorganic resin molding sand into the inorganic resin molding sand;
(2) adding silane coupling agent according to 0.3-0.8% of the total weight of the inorganic resin molding sand after mixing for continuously mixing for 60-120 s;
(3) drying the molding sand mixed in the step (2) by using hot air at the temperature of 80-100 ℃, wherein the dried molding sand is in a loose sand shape;
(4) dispersing the molding sand in the step (3) by screening, adding citric acid aqueous solution accounting for 0.6-1.2% of the total weight of the inorganic resin molding sand, uniformly mixing, and performing sand shooting molding;
(5) and after sand shooting, introducing dried air to solidify and form the sand sample to obtain the sand sample.
5. The method of applying the method for improving fluidity of inorganic resin molding sand according to claim 4, wherein: in the step (4), the mass concentration of the citric acid aqueous solution is 50 wt%.
6. The method of applying the method for improving fluidity of inorganic resin molding sand according to claim 4, wherein: in the step (4), sand shooting and forming are carried out through a core shooting machine, and the temperature of a core shooting machine mold is 50-80 ℃.
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| CN110625059B (en) * | 2019-09-24 | 2021-04-16 | 湖北工业大学 | Sorbitol modified phosphate binder, and preparation method and application method thereof |
| CN113510217B (en) * | 2021-09-15 | 2021-12-24 | 中车戚墅堰机车车辆工艺研究所有限公司 | Inorganic dry precoated sand for warm core box molding and core making method thereof |
| CN113787165B (en) * | 2021-09-29 | 2023-05-26 | 江西特欣实业有限公司 | High-melting-point precoated sand with good fluidity |
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| CN104903023B (en) * | 2012-12-19 | 2017-06-16 | 旭有机材工业株式会社 | The manufacture method of precoated sand and its manufacture method and casting mold |
| CN103111581B (en) * | 2013-02-27 | 2015-07-22 | 湖北工业大学 | Preparation method for inorganic binder and application thereof |
| CN103468154B (en) * | 2013-08-27 | 2014-11-19 | 黑龙江省科学院石油化学研究院 | High-temperature-resistant room temperature curing phosphate adhesive and preparation method thereof |
| CN106660109B (en) * | 2014-06-20 | 2019-11-19 | 旭有机材株式会社 | The manufacturing method and casting mold of casting mold |
| CN104289661B (en) * | 2014-09-10 | 2016-08-24 | 湖北工业大学 | The preparation of phosphate inorganic adhesive precoated sand and forming method thereof |
| CN105964891B (en) * | 2016-05-20 | 2017-11-14 | 重庆长江造型材料（集团）股份有限公司 | A kind of phosphate inorganic adhesive sand with high fluidity and preparation method thereof |
| MX2019002260A (en) * | 2016-08-31 | 2019-07-04 | Asahi Yukizai Corp | Casting mold manufacturing method. |
| CN107584069B (en) * | 2017-10-31 | 2020-03-10 | 湖北工业大学 | Thermosetting phosphate casting binder and preparation method and use method thereof |
| CN108405794B (en) * | 2018-03-12 | 2019-10-25 | 湖北工业大学 | A kind of hot core sand inorganic binder and preparation method thereof |
| CN109454200B (en) * | 2018-12-14 | 2020-04-24 | 湖北工业大学 | Liquid curing agent for phosphate binder and application thereof |
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