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Sand core surface treatment method

A technology of surface treatment and sand core, applied in the direction of core, coating, casting molding equipment, etc., can solve the problems affecting the efficiency and quality of casting, and achieve the effect of preventing interaction

Pending Publication Date: 2021-06-11
ZHEJIANG WANGSHENG POWER MECHANICAL & ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the actual production process, the molten metal is easy to interact with the sand mold, which affects the efficiency and quality of casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A sand core surface treatment method, comprising the steps of:

[0030] S1. First, evenly paint a layer of casting paint on the surface of the mold, and the thickness of the casting paint is 0.6mm;

[0031] S2. After the paint dries naturally, use sandpaper to grind the profile paint until it is even and smooth, there is no accumulation on the surface of the mold, and the carbon content mass fraction of acetylene is 92.3%;

[0032] S3. Smoke a layer of carbon black evenly on the surface of the mold with a burning acetylene nozzle, the thickness of which is 0.25 mm.

[0033] The raw materials of the casting coating include by weight: 100 parts of refractory aggregate, 50 parts of sintering aid, 35 parts of suspending agent, 20 parts of binder, 20 parts of thickener, 6 parts of defoamer, 6 parts of polypropylene fiber 6 parts, 6 parts of inorganic whiskers, 6 parts of dispersant.

[0034] The refractory aggregate is formed by mixing magnesium oxysulfide cement, expanded...

Embodiment 2

[0038] A sand core surface treatment method, comprising the steps of:

[0039] S1. First, evenly paint a layer of casting paint on the surface of the mold, and the thickness of the casting paint is 0.4mm;

[0040] S2. After the coating is naturally dried, use sandpaper to grind the profile coating until it is even and smooth, and there is no accumulation on the surface of the mold, and the carbon content mass fraction of acetylene is 91%;

[0041] S3. Smoke a layer of carbon black evenly on the surface of the mold with a burning acetylene nozzle, the thickness of which is 0.2 mm.

[0042] The raw materials of the casting coating include by weight: 80 parts of refractory aggregate, 40 parts of sintering aid, 20 parts of suspending agent, 10 parts of binder, 15 parts of thickener, 4 parts of defoamer, 2 parts of polypropylene fiber 4 parts, 4 parts of inorganic whiskers, 4 parts of dispersant.

[0043] The refractory aggregate is formed by mixing magnesium oxysulfide cement, e...

Embodiment 3

[0047] A sand core surface treatment method, comprising the steps of:

[0048] S1. First, evenly paint a layer of casting paint on the surface of the mold, and the thickness of the casting paint is 0.8mm;

[0049] S2, after the coating is naturally dried, use sandpaper to grind the profile coating until it is even and smooth, and there is no accumulation on the surface of the mold, and the carbon content mass fraction of acetylene is 94%;

[0050] S3. Smoke a layer of carbon black uniformly on the surface of the mold with a burning acetylene nozzle, the thickness of which is 0.3mm.

[0051] The raw materials of the casting coating include by weight: 120 parts of refractory aggregate, 60 parts of sintering aid, 50 parts of suspending agent, 30 parts of binder, 25 parts of thickener, 8 parts of defoamer, 8 parts of polypropylene fiber 8 parts, 8 parts of inorganic whiskers, 8 parts of dispersant.

[0052] The refractory aggregate is formed by mixing magnesium oxysulfide cement...

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Abstract

The invention discloses a sand core surface treatment method. The sand core surface treatment method comprises the following steps that S1, firstly, the surface of a casting mold is evenly coated with a layer of casting coating; S2, the coating is naturally dried, then the molded surface coating is ground to be uniform and smooth through abrasive paper, and the surface of the casting mold is not accumulated; and S3, a layer of carbon black is evenly fumed on the surface of the casting mold through a burning acetylene spray head. According to the sand core surface treatment method, the coating and a carbon black layer generate a strong reducing atmosphere during molten metal pouring, an air film and a carbon film can be formed on the interface of a casting and the coating, molten metal and a sand mold are preventing from interacting, the air-proof effect is generated, combustion is incomplete when the acetylene spray head is used for burning and combustion is carried out in air, elemental carbon can be separated out, the elemental carbon is attached to the surface of the casting mold to form the layer of carbon black so that the air film and the carbon film can be formed on the interface of the casting and the coating, the molten metal and the sand mold are prevented from interacting, and the air-proof effect is generated.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a sand core surface treatment method. Background technique [0002] Sand mold is a casting cavity made of raw sand, binder and other auxiliary materials in the casting production process. Sand casting refers to the method of producing castings in sand molds. Molding sand and core sand are usually made by mixing silica sand, clay or bonding material and water in a certain proportion. Molding sand and core sand must have "one strong and three properties", that is, certain strength, air permeability, fire resistance and concession. Sand casting is the most widely used casting method in actual production. [0003] Sand core is the material used to make core in foundry production, which is composed of foundry sand, sand binder and so on. The material used to make the core in foundry production is generally made of molding materials such as foundry sand, sand binder and...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/10
CPCB22C3/00B22C9/10
Inventor 潘贤顺李祥文
Owner ZHEJIANG WANGSHENG POWER MECHANICAL & ELECTRICAL
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