CN112191797A - Molding sand formula for casting automobile cylinder body - Google Patents
Molding sand formula for casting automobile cylinder body Download PDFInfo
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- CN112191797A CN112191797A CN202010907773.3A CN202010907773A CN112191797A CN 112191797 A CN112191797 A CN 112191797A CN 202010907773 A CN202010907773 A CN 202010907773A CN 112191797 A CN112191797 A CN 112191797A
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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
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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
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- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a molding sand formula for casting an automobile cylinder body, which belongs to the technical field of casting and comprises the following raw materials in percentage by mass: 85.0-87.0% of used sand, 5.7-6.0% of binder, 4.5-5.5% of additive, 0.37-0.46% of recycled ash and 2.5-2.9% of water. The used sand is silica sand, the binder is sodium bentonite, and the additive is MSC powder. By reasonably matching the component proportion of the molding sand, the variety of auxiliary materials is reduced compared with the conventional molding sand formula, the molding sand has proper strength, toughness and air permeability, the compaction rate of the molding sand can reach 35.0-39.0%, the mud content is 10.0-12.0%, the air permeability is 100-130%, the wet tensile strength is more than or equal to 0.003MPa, the rejection rate of the casting is less than 1.0%, and the defects of sand inclusion, sand holes, surface sand sticking and the like of the casting are obviously reduced; and reasonably utilizes part of waste dust; the comprehensive rejection rate of the produced castings is obviously reduced, the stability and the production efficiency of the molding sand are improved, and the normal cycle production can be realized.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a molding sand formula for casting an automobile cylinder body.
Background
Sand casting refers to a casting method for producing castings in sand, steel, iron and most nonferrous alloy castings can be obtained by the sand casting method, and because the molding materials used for sand casting are cheap and easy to obtain, the casting mold is simple and convenient to manufacture, and can adapt to single-piece production, batch production and mass production of the castings, the sand casting is a basic process in casting production for a long time.
In the casting production of green sand, the quality of the molding sand is crucial to the quality of a casting, the effective control of the molding sand is one of the most important methods for reducing the defects of the casting, the main performance indexes of the molding sand comprise the compactness, the strength, the toughness, the air permeability and the sand adhesion resistance, and the indexes directly influence the defects of the casting such as sand adhesion, sand inclusion, sand holes and the like; in the production process of the cylinder body, a large amount of core sand enters the reclaimed sand, and the strength, the air permeability and other properties of the molding sand are influenced. The performance of the foundry sand is closely related to the quality of casting products, the performance of the foundry sand is often greatly fluctuated, the high rejection rate of many foundries is caused by the unstable performance of the foundry sand, and the performance of the foundry sand mainly depends on whether the component proportion of the foundry sand is reasonable or not.
The molding sand used in the industry at present has different types, and more types of auxiliary materials are added into the recycled sand, for example: coal powder, calcium bentonite, starch or dextrin, olivine sand and the like, and the uncertainty of molding sand control is increased.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a molding sand formula for casting the automobile cylinder body, the compaction rate of the molding sand can reach 35.0-39.0%, the mud content is 10.0-12.0%, the air permeability is 100-130%, the wet tensile strength is more than or equal to 0.003MPa, the rejection rate of the casting is less than 1.0%, the casting is at the leading level in the industry, the comprehensive rejection rate of the produced casting can be obviously reduced, the stability and the production efficiency of the molding sand are improved, and the molding sand can be produced in a normal cycle.
The invention is realized by the following technical scheme:
the molding sand formula for casting the automobile cylinder body comprises the following raw materials in percentage by mass: 85.0-87.0% of used sand, 5.7-6.0% of binder, 4.5-5.5% of additive, 0.37-0.46% of recycled ash and 2.5-2.9% of water.
Preferably, the used sand is silica sand, the binder is sodium bentonite, and the additive is MSC powder.
Preferably, the feed additive comprises the following raw materials in percentage by mass: 85.0 percent of used sand, 5.7 percent of binder, 4.5 percent of additive, 0.37 percent of recycled ash and 2.5 percent of water.
Preferably, the feed additive comprises the following raw materials in percentage by mass: 87.0 percent of used sand, 6.0 percent of binder, 5.5 percent of additive, 0.46 percent of recycled ash and 2.9 percent of water.
Preferably, the used sand has the granularity of 50/100 meshes and AFS of 49-56; the 200-mesh sieving rate of the recycled ash is more than 75 percent.
Preferably, the preparation method of the used sand comprises the following steps: during the transportation of the poured shakeout sand to a sand silo, firstly, separating metal in the returned sand through magnetic separation, then removing sand blocks through a hexagonal sieve to ensure that the used returned sand does not contain metal impurities and has proper granularity (50/100 meshes; AFS:49-56), and feeding the screened molding sand into the sand silo through a hoister; in the process of conveying the shakeout sand to a sand silo, the redundant dust in the sand needs to be pumped out; and the falling sand can properly spray moisture in the transportation process so as to reduce the temperature of the sand and ensure that the returned sand contains a certain amount of moisture.
Compared with the prior art, the invention has the following advantages:
by reasonably matching the component proportion of the molding sand, the variety of auxiliary materials is reduced compared with the conventional molding sand formula, the corresponding molding sand has proper strength, toughness and air permeability, and the defects of sand inclusion, sand holes, surface sand adhesion and the like of a casting are obviously reduced; and reasonably utilizes part of waste dust; the comprehensive rejection rate of the produced castings is obviously reduced, the stability and the production efficiency of the molding sand are improved, and the normal cycle production can be realized.
Detailed Description
The following embodiments are merely examples for illustrating the technical solutions of the present invention more clearly, and therefore, the following embodiments are only examples, and the protection scope of the present invention is not limited thereby.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction;
in order to clearly and completely describe the technical scheme and the specific working process thereof, the specific implementation manner of the invention is as follows:
example 1
The molding sand formula for casting the automobile cylinder body comprises the following raw materials in percentage by mass: 85.0-87.0% of used sand, 5.7-6.0% of binder, 4.5-5.5% of additive, 0.37-0.46% of recycled ash and 2.5-2.9% of water.
The used sand is silica sand, the binder is sodium bentonite, and the additive is MSC powder.
The granularity of the used sand is 50/100 meshes, and the AFS is 49-56; the 200-mesh sieving rate of the recycled ash is more than 75 percent.
Example 2
The molding sand formula for casting the automobile cylinder body comprises the following raw materials in percentage by mass: 85.0 percent of used sand, 5.7 percent of binder, 4.5 percent of additive, 0.37 percent of recycled ash and 2.5 percent of water.
The used sand is silica sand, the binder is sodium bentonite, and the additive is MSC powder.
The granularity of the used sand is 50/100 meshes, and the AFS is 49-56; the 200-mesh sieving rate of the recycled ash is more than 75 percent.
Example 3
The molding sand formula for casting the automobile cylinder body comprises the following raw materials in percentage by mass: 87.0 percent of used sand, 6.0 percent of binder, 5.5 percent of additive, 0.46 percent of recycled ash and 2.9 percent of water.
The used sand is silica sand, the binder is sodium bentonite, and the additive is MSC powder.
The granularity of the used sand is 50/100 meshes, and the AFS is 49-56; the 200-mesh sieving rate of the recycled ash is more than 75 percent.
Example 4
Recycling used sand: in the process of transporting the shakeout sand to a sand silo after casting, firstly, separating metal in the returned sand through magnetic separation, then removing sand blocks through a hexagonal sieve to ensure that the used returned sand does not contain metal impurities and has proper granularity, and feeding the screened molding sand into the sand silo through a hoister; in the process of conveying the shakeout sand to a sand silo, the redundant dust in the sand needs to be pumped out; and the falling sand can properly spray moisture in the transportation process so as to reduce the temperature of the sand and ensure that the returned sand contains proper moisture.
Sand preparation: calculating the addition of the auxiliary materials according to the sand return state, and controlling the content of each raw material to be as follows: 85.0-87.0% of used sand (silica sand), 5.7-6.0% of binder (sodium bentonite), 4.5-5.5% of additive (MSC powder) and 0.37-0.46% of recycled ash, wherein the raw materials are added into a sand mixer and then are mixed for 3 seconds, the temperature and moisture value of the sand are detected, the vacuumizing and the moisture replenishing are carried out according to the temperature and the moisture of the sand, the moisture content is controlled to be 2.5-2.9%, the temperature of the molding sand is controlled to be below 45 ℃, and after the mixed grinding is carried out for 70 seconds, the uniformly stirred molding sand can be used for molding.
The compact rate of the molding sand can reach 35.0-39.0%, the mud content is 10.0-12.0%, the air permeability is 100-.
By reasonably matching the component proportion of the molding sand, the variety of auxiliary materials is reduced compared with the conventional molding sand formula, the corresponding molding sand has proper strength, toughness and air permeability, and the defects of sand inclusion, sand holes, surface sand adhesion and the like of a casting are obviously reduced; and reasonably utilizes part of waste dust; the comprehensive rejection rate of the produced castings is obviously reduced, the stability and the production efficiency of the molding sand are improved, and the normal cycle production can be realized.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. The molding sand formula for casting the automobile cylinder body is characterized by comprising the following raw materials in percentage by mass: 85.0-87.0% of used sand, 5.7-6.0% of binder, 4.5-5.5% of additive, 0.37-0.46% of recycled ash and 2.5-2.9% of water.
2. The molding sand formulation for casting of automobile cylinders as claimed in claim 1, wherein the used sand is silica sand, the binder is sodium bentonite, and the additive is MSC powder.
3. The molding sand formula for casting the automobile cylinder body as claimed in claim 1, which is characterized by comprising the following raw materials in percentage by mass: 85.0 percent of used sand, 5.7 percent of binder, 4.5 percent of additive, 0.37 percent of recycled ash and 2.5 percent of water.
4. The molding sand formula for casting the automobile cylinder body as claimed in claim 1, which is characterized by comprising the following raw materials in percentage by mass: 87.0 percent of used sand, 6.0 percent of binder, 5.5 percent of additive, 0.46 percent of recycled ash and 2.9 percent of water.
5. The molding sand formulation for casting of automobile cylinders as claimed in claim 1, wherein the used sand has a particle size of 50/100 meshes, and the 200 mesh sieve fraction of the recycled ash is more than 75%.
6. The molding sand formulation for casting automobile cylinders as claimed in claim 1, wherein the used sand is prepared by the following method: in the process of transporting the shakeout sand to a sand silo after casting, firstly, separating metal in the returned sand through magnetic separation, then removing sand blocks through a hexagonal sieve to ensure that the used returned sand does not contain metal impurities and has proper granularity, and feeding the screened molding sand into the sand silo through a hoister; in the process of conveying the shakeout sand to a sand silo, the redundant dust in the sand needs to be pumped out; and the falling sand can properly spray moisture in the transportation process so as to reduce the temperature of the sand and ensure that the returned sand contains a certain amount of moisture.
7. The molding sand formulation for casting of automobile cylinders as claimed in claim 1, wherein the suitable particle size is 50/100 mesh, AFS 49-56.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010907773.3A CN112191797A (en) | 2020-09-02 | 2020-09-02 | Molding sand formula for casting automobile cylinder body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010907773.3A CN112191797A (en) | 2020-09-02 | 2020-09-02 | Molding sand formula for casting automobile cylinder body |
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| CN112191797A true CN112191797A (en) | 2021-01-08 |
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| CN202010907773.3A Pending CN112191797A (en) | 2020-09-02 | 2020-09-02 | Molding sand formula for casting automobile cylinder body |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351825A (en) * | 2021-05-17 | 2021-09-07 | 中国第一汽车股份有限公司 | Control method for preventing surface sand-sticking defect of thin-wall gray iron cylinder body |
| CN113369438A (en) * | 2021-05-17 | 2021-09-10 | 中国第一汽车股份有限公司 | Method for controlling content of molding sand water-absorbing fine powder for gray iron engine cylinder |
| CN115608918A (en) * | 2022-11-01 | 2023-01-17 | 安徽省含山县威建铸造厂(普通合伙) | Casting method for improving sand inclusion of outer cavity of cylinder body |
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| CN104226889A (en) * | 2014-09-24 | 2014-12-24 | 河南省西峡汽车水泵股份有限公司 | Casting molding sand with regenerated dedusting ash and preparation technology of casting molding sand |
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| 李育洛等: "MSC铸铁型砂添加剂的工艺试验和生产实践", 《第十五届中国铸造协会年会论文集》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351825A (en) * | 2021-05-17 | 2021-09-07 | 中国第一汽车股份有限公司 | Control method for preventing surface sand-sticking defect of thin-wall gray iron cylinder body |
| CN113369438A (en) * | 2021-05-17 | 2021-09-10 | 中国第一汽车股份有限公司 | Method for controlling content of molding sand water-absorbing fine powder for gray iron engine cylinder |
| CN115608918A (en) * | 2022-11-01 | 2023-01-17 | 安徽省含山县威建铸造厂(普通合伙) | Casting method for improving sand inclusion of outer cavity of cylinder body |
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Application publication date: 20210108 |