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Environment-friendly molding sand additive and using method thereof

A technology of additives and molding sand, which is applied in the direction of casting molds, cores, casting molding equipment, etc., can solve the problems of heavy pollution, achieve smooth surfaces, reduce casting production costs, and have good recycling effects

Inactive Publication Date: 2018-08-03
云南衡纬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a molding sand additive that is pollution-free and has excellent anti-sand sticking performance to improve the surface quality of castings in view of the defect that the existing coal powder additives are highly polluted

Method used

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  • Environment-friendly molding sand additive and using method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] Take SiO by mass ratio through metering device 2 70%, Al 2 o 3 25%, MgO 0.5%, Fe 2 o 3 2%, CaO 2%, Fe 3 o 4 0.5% mixed evenly, the total amount of preparation is 1000 kg, and packed into packaging bags.

[0018] In a foundry, 80% of foundry sand, 8% of bentonite, 7% of molding sand additive, and 5% of water are taken by mass ratio through a metering device, and mixed for 3 minutes. The molten metal is cast, cooled and separated to obtain finished castings. There is no sticky sand on the surface of the castings, and the castings have no other defects. Been using it for 3 months.

Embodiment 2

[0020] Take SiO by mass ratio through metering device 2 55%, Al 2 o 3 35%, MgO 3%, Fe 2 o 3 4%, CaO 2%, Fe 3 o 4 1% is mixed evenly, and the total amount of preparation is 10,000 kg, and packed into packaging bags.

[0021] In a foundry, 85% of foundry sand, 6% of bentonite, 5% of molding sand additive, and 4% of water are taken by mass ratio through a metering device, and mixed for 2 minutes. Molding line, casting molten metal, cooling for 2 hours, separated to obtain finished castings, the surface of the castings is smooth, and the quality of the castings is qualified. Been using it for 2 months.

Embodiment 3

[0023] Take SiO by mass ratio through metering device 2 65%, Al 2 o 3 25%, MgO 1.2%, Fe 2 o 3 1.3%, CaO 7%, Fe 3 o 4 0.5% is mixed evenly, and the total amount of preparation is 10,000 kg, and packed into packaging bags.

[0024] In a foundry, 83.5% of foundry sand, 7% of bentonite, 6% of molding sand additive, and 3.5% of water are taken by mass ratio through a metering device, and mixed for 90 seconds. Tankless molding line, casting molten metal, cooling for 1 hour, separated to obtain finished castings, the surface of the castings is smooth, and the quality of the castings is qualified. Been using it for 4 months.

[0025] Such as figure 1 As shown, from the scanning electron microscope picture of the green molding sand additive of the present invention, it can be seen that the microscopic appearance of the additive is formed by agglomeration of a large number of fine particles, showing a porous structure. Such a morphological structure is conducive to the disch...

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Abstract

The invention relates to the field of casting industry, in particular to an environment-friendly molding sand additive and a using method thereof. The environment-friendly molding sand additive is formed by mixing the following raw materials of, by mass, 50-85% of SiO2, 9-45% of Al2O3, 0.2-3% of MgO, 1-8% of Fe2O3, 1-7% of CaO and 0.5-8% of Fe3O4. The additive does not generate combustion reaction, and no toxic and harmful gas is generated in the casting process, so that the additive belongs to a pollution-free and environment-friendly material which is beneficial to energy conservation and emission reduction; the additive is mainly used for replacing organic matter additives such as coal powder used in traditional wet casting; and the additive has excellent sand-sticking resistance, wettability of a casting mold and a metal liquid is reduced, and the surface quality of a casting is improved.

Description

technical field [0001] The invention relates to the field of foundry industry, in particular to a green molding sand additive and its application method. Background technique [0002] In the foundry industry, molding sand is the material used for molding in foundry. Molding sand is generally made by mixing molding materials such as foundry sand, molding sand binder and auxiliary additives in a certain proportion, and natural silica sand containing clay can also be used. [0003] Molding sand plays an extremely important role in foundry production, and the casting reject rate will increase due to unstable quality of molding sand. Usually, the performance index requirements for molding sand include: air permeability, strength, yield, collapse, fluidity, etc. In order to improve the surface quality of castings and reduce casting defects, additives are often added to the molding sand during the casting process. In the casting process, after the molten metal is poured into the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 牛文峰李祖来
Owner 云南衡纬科技有限公司
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