CN112439869A - Preparation method of molding sand for casting - Google Patents
Preparation method of molding sand for casting Download PDFInfo
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- CN112439869A CN112439869A CN202011304356.6A CN202011304356A CN112439869A CN 112439869 A CN112439869 A CN 112439869A CN 202011304356 A CN202011304356 A CN 202011304356A CN 112439869 A CN112439869 A CN 112439869A
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- Prior art keywords
- molding sand
- sand
- drying
- casting
- constant weight
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Classifications
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a preparation method of molding sand for casting; relates to the technical field of casting, and comprises the following steps: (1) quartz sand treatment: calcining for 1.5-2 hours in an inert atmosphere, then performing water quenching for 30min, drying to constant weight, calcining for 1 hour in an air atmosphere, then performing water quenching for 35min, and then drying to constant weight to obtain treated quartz sand; (2) placing bentonite in a potassium permanganate solution for immersion treatment for 30min, then adopting a sulfuric acid solution with the mass fraction of 5% to adjust the pH value to 3, continuing to preserve heat and stir for 2 hours, then carrying out suction filtration, washing with clear water to be neutral, and drying to constant weight to obtain modified bentonite; (3) sequentially adding the modified bentonite, the quartz sand and the water into a stirrer, and uniformly stirring; the molding sand for casting prepared by the method has excellent strength performance, and the bending strength of the molding sand prepared by the method is excellent after the molding sand is dried.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a preparation method of molding sand for casting.
Background
The foundry sand is sand or core sand coated with a layer of solid resin film on the surface of sand before molding. There are two film-coating processes of cold method and hot method: dissolving the resin with ethanol by a cold method, adding urotropine in the sand mixing process to coat the urotropine and the sand on the surface of sand grains, and volatilizing the ethanol to obtain foundry molding sand; preheating sand to a certain temperature by a thermal method, adding resin to melt the sand, stirring the sand to coat the resin on the surface of the sand, adding urotropine aqueous solution and a lubricant, cooling, crushing and screening to obtain the foundry sand. The casting sand has the advantages of high strength, low gas generation, high dimensional precision of produced castings, smooth surface, convenient preservation and the like, and is widely applied to steel castings and iron castings.
The interface bonding strength between the foundry sand and the binder prepared by the existing method is low, so that the strength of a cavity is poor easily, and the quality of a casting is reduced.
Disclosure of Invention
The invention aims to provide a preparation method of molding sand for casting, which aims to solve the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a preparation method of molding sand for casting comprises the following steps:
(1) quartz sand treatment:
calcining for 1.5-2 hours in an inert atmosphere, then performing water quenching for 30min, drying to constant weight, calcining for 1 hour in an air atmosphere, then performing water quenching for 35min, and then drying to constant weight to obtain treated quartz sand;
(2) placing bentonite in a potassium permanganate solution for immersion treatment for 30min, then adopting a sulfuric acid solution with the mass fraction of 5% to adjust the pH value to 3, continuing to preserve heat and stir for 2 hours, then carrying out suction filtration, washing with clear water to be neutral, and drying to constant weight to obtain modified bentonite;
(3) and adding the modified bentonite, the quartz sand and the water into a stirrer in sequence, and stirring uniformly.
As a further technical scheme: the inert atmosphere is a nitrogen atmosphere.
As a further technical scheme: the temperature of the water quenching is 20 ℃.
As a further technical scheme: the calcination temperature under the inert atmosphere is 800 ℃.
As a further technical scheme: the calcination temperature in the air atmosphere is 650-659 ℃.
As a further technical scheme: the mass ratio of the bentonite to the potassium permanganate solution is 1: 10.
As a further technical scheme: the mass fraction of the potassium permanganate solution is 0.5%.
As a further technical scheme: the mass ratio of the modified bentonite to the quartz sand to the water is 12-15:80: 10.
Has the advantages that:
the method has the advantages that the molding sand for casting prepared by the method has excellent strength performance, and the bending strength of the molding die prepared by the molding sand prepared by the method is excellent after drying, so that the method can greatly improve the mechanical property of the prepared molding die by treating the quartz sand, and bear stronger impact force during casting by greatly enhancing the mechanical property of the molding die, thereby better ensuring the quality of castings and reducing the rejection rate.
Detailed Description
A preparation method of molding sand for casting comprises the following steps:
(1) quartz sand treatment:
calcining for 1.5-2 hours in an inert atmosphere, then performing water quenching for 30min, drying to constant weight, calcining for 1 hour in an air atmosphere, then performing water quenching for 35min, and then drying to constant weight to obtain treated quartz sand;
(2) placing bentonite in a potassium permanganate solution for immersion treatment for 30min, then adopting a sulfuric acid solution with the mass fraction of 5% to adjust the pH value to 3, continuing to preserve heat and stir for 2 hours, then carrying out suction filtration, washing with clear water to be neutral, and drying to constant weight to obtain modified bentonite;
(3) and adding the modified bentonite, the quartz sand and the water into a stirrer in sequence, and stirring uniformly.
As a further technical scheme: the inert atmosphere is a nitrogen atmosphere.
As a further technical scheme: the temperature of the water quenching is 20 ℃.
As a further technical scheme: the calcination temperature under the inert atmosphere is 800 ℃.
As a further technical scheme: the calcination temperature in the air atmosphere is 650-659 ℃.
As a further technical scheme: the mass ratio of the bentonite to the potassium permanganate solution is 1: 10.
As a further technical scheme: the mass fraction of the potassium permanganate solution is 0.5%.
As a further technical scheme: the mass ratio of the modified bentonite to the quartz sand to the water is 12-15:80: 10.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of molding sand for casting comprises the following steps:
(1) quartz sand treatment:
calcining for 1.5 hours in an inert atmosphere, then performing water quenching for 30min, drying to constant weight, calcining for 1 hour in an air atmosphere, then performing water quenching for 35min, and then drying to constant weight to obtain treated quartz sand;
(2) placing bentonite in a potassium permanganate solution for immersion treatment for 30min, then adopting a sulfuric acid solution with the mass fraction of 5% to adjust the pH value to 3, continuing to preserve heat and stir for 2 hours, then carrying out suction filtration, washing with clear water to be neutral, and drying to constant weight to obtain modified bentonite;
(3) and adding the modified bentonite, the quartz sand and the water into a stirrer in sequence, and stirring uniformly.
As a further technical scheme: the inert atmosphere is a nitrogen atmosphere.
As a further technical scheme: the temperature of the water quenching is 20 ℃.
As a further technical scheme: the calcination temperature under the inert atmosphere is 800 ℃.
As a further technical scheme: the calcination temperature under the air atmosphere was 650 ℃.
As a further technical scheme: the mass ratio of the bentonite to the potassium permanganate solution is 1: 10.
As a further technical scheme: the mass fraction of the potassium permanganate solution is 0.5%.
As a further technical scheme: the mass ratio of the modified bentonite to the quartz sand to the water is 12:80: 10.
Example 2
A preparation method of molding sand for casting comprises the following steps:
(1) quartz sand treatment:
calcining for 2 hours in an inert atmosphere, then performing water quenching for 30min, drying to constant weight, calcining for 1 hour in an air atmosphere, then performing water quenching for 35min, and then drying to constant weight to obtain treated quartz sand;
(2) placing bentonite in a potassium permanganate solution for immersion treatment for 30min, then adopting a sulfuric acid solution with the mass fraction of 5% to adjust the pH value to 3, continuing to preserve heat and stir for 2 hours, then carrying out suction filtration, washing with clear water to be neutral, and drying to constant weight to obtain modified bentonite;
(3) and adding the modified bentonite, the quartz sand and the water into a stirrer in sequence, and stirring uniformly.
As a further technical scheme: the inert atmosphere is a nitrogen atmosphere.
As a further technical scheme: the temperature of the water quenching is 20 ℃.
As a further technical scheme: the calcination temperature under the inert atmosphere is 800 ℃.
As a further technical scheme: the calcination temperature under the air atmosphere was 659 ℃.
As a further technical scheme: the mass ratio of the bentonite to the potassium permanganate solution is 1: 10.
As a further technical scheme: the mass fraction of the potassium permanganate solution is 0.5%.
As a further technical scheme: the mass ratio of the modified bentonite to the quartz sand to the water is 15:80: 10.
Example 3
A preparation method of molding sand for casting comprises the following steps:
(1) quartz sand treatment:
calcining for 1.8 hours in an inert atmosphere, then performing water quenching for 30min, drying to constant weight, calcining for 1 hour in an air atmosphere, then performing water quenching for 35min, and then drying to constant weight to obtain treated quartz sand;
(2) placing bentonite in a potassium permanganate solution for immersion treatment for 30min, then adopting a sulfuric acid solution with the mass fraction of 5% to adjust the pH value to 3, continuing to preserve heat and stir for 2 hours, then carrying out suction filtration, washing with clear water to be neutral, and drying to constant weight to obtain modified bentonite;
(3) and adding the modified bentonite, the quartz sand and the water into a stirrer in sequence, and stirring uniformly.
As a further technical scheme: the inert atmosphere is a nitrogen atmosphere.
As a further technical scheme: the temperature of the water quenching is 20 ℃.
As a further technical scheme: the calcination temperature under the inert atmosphere is 800 ℃.
As a further technical scheme: the calcination temperature under the air atmosphere was 653 ℃.
As a further technical scheme: the mass ratio of the bentonite to the potassium permanganate solution is 1: 10.
As a further technical scheme: the mass fraction of the potassium permanganate solution is 0.5%.
As a further technical scheme: the mass ratio of the modified bentonite to the quartz sand to the water is 14:80: 10.
The mold prepared from the molding sand of example 1 had a breaking strength of 0.35MPa after drying;
the mold prepared from the molding sand of example 2 had a breaking strength of 0.38MPa after drying;
example 3 a pattern mold made of the molding sand was dried to have a breaking strength of 0.30 MPa.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (8)
1. The preparation method of the molding sand for casting is characterized by comprising the following steps of:
(1) quartz sand treatment:
calcining for 1.5-2 hours in an inert atmosphere, then performing water quenching for 30min, drying to constant weight, calcining for 1 hour in an air atmosphere, then performing water quenching for 35min, and then drying to constant weight to obtain treated quartz sand;
(2) placing bentonite in a potassium permanganate solution for immersion treatment for 30min, then adopting a sulfuric acid solution with the mass fraction of 5% to adjust the pH value to 3, continuing to preserve heat and stir for 2 hours, then carrying out suction filtration, washing with clear water to be neutral, and drying to constant weight to obtain modified bentonite;
(3) and adding the modified bentonite, the quartz sand and the water into a stirrer in sequence, and stirring uniformly.
2. The method of manufacturing molding sand for casting according to claim 1, wherein: the inert atmosphere is a nitrogen atmosphere.
3. The method of manufacturing molding sand for casting according to claim 1, wherein: the temperature of the water quenching is 20 ℃.
4. The method of manufacturing molding sand for casting according to claim 1, wherein: the calcination temperature under the inert atmosphere is 800 ℃.
5. The method of manufacturing molding sand for casting according to claim 1, wherein: the calcination temperature in the air atmosphere is 650-659 ℃.
6. The method of manufacturing molding sand for casting according to claim 1, wherein: the mass ratio of the bentonite to the potassium permanganate solution is 1: 10.
7. The method of manufacturing molding sand for casting according to claim 1, wherein: the mass fraction of the potassium permanganate solution is 0.5%.
8. The method of manufacturing molding sand for casting according to claim 1, wherein: the mass ratio of the modified bentonite to the quartz sand to the water is 12-15:80: 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011304356.6A CN112439869A (en) | 2020-11-19 | 2020-11-19 | Preparation method of molding sand for casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011304356.6A CN112439869A (en) | 2020-11-19 | 2020-11-19 | Preparation method of molding sand for casting |
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| Publication Number | Publication Date |
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| CN112439869A true CN112439869A (en) | 2021-03-05 |
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| CN202011304356.6A Withdrawn CN112439869A (en) | 2020-11-19 | 2020-11-19 | Preparation method of molding sand for casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114392836A (en) * | 2021-12-16 | 2022-04-26 | 江苏中腾石英材料科技股份有限公司 | Processing technology of high-purity quartz sand |
-
2020
- 2020-11-19 CN CN202011304356.6A patent/CN112439869A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114392836A (en) * | 2021-12-16 | 2022-04-26 | 江苏中腾石英材料科技股份有限公司 | Processing technology of high-purity quartz sand |
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Application publication date: 20210305 |
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