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 i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] A surface treatment method of a sand core, including the following steps:

[0030] S1, first, the cast coating is applied, and the thickness of the cast coating is 0.6 mm;

[0031] After S2, the coating is naturally dried, the surface of the surface coating is grounded uniform and smooth with sandpaper, and the surface of the mold is not replenished, and the carbon content mass fraction of acetylene is 92.3%;

[0032] S3, with a combustion of acetylene head uniformly smoked a carbon black in the mold surface, the thickness of carbon black is 0.25 mm.

[0033] The material of the cast coating comprises 100 parts by weight, 50 parts of the fire, 50 parts of the burner, 35 parts of the suspension, 20 binder, 20 thickeners, 6 defoamer, Polypropylene fiber 6 Add 6 parts of the inorganic cleaner and 6 dispersants.

[0034] The fire-resistant aggregate is mixed by a thiosphine cement, expanded pearl rock, firefiber and vermiculite, is mixed by weight than 35: 6:...

Example Embodiment

[0037] Example 2

[0038] A surface treatment method of a sand core, including the following steps:

[0039] S1, first coating a coating coating on the mold surface, the thickness of the cast coating is 0.4 mm;

[0040] After S2, the coating is naturally dried, the surface coating is ground to uniform and smooth with sandpaper, and the molded surface of the mold is not replenished, and the carbon content mass fraction of acetylene is 91%;

[0041] S3, using the combustion of acetylene head uniform smoked carbon black in the mold surface, carbon black thickness is 0.2 mm.

[0042] The material of the cast coating comprises 80 parts by weight, 40 parts of a burner, 20 suspension, 10 binder, 15 thickeners, 4 defoamers, Polypropylene 2 4 parts of the inorganic cleaner, 4 dispersants.

[0043] The fire-resistant aggregate is formed by mixing of thio-oxide cement, expanded pearl rock, firefiber and vermiculite, and is mixed by weight than 20: 4: 2: 1.

[0044] The adhesive is mixed with...

Example Embodiment

[0046] Example 3

[0047] A surface treatment method of a sand core, including the following steps:

[0048] S1, first coating a coating coating on the mold surface, the thickness of the cast coating is 0.8 mm;

[0049] S2, after the coating is naturally dried, the type surface coating is ground to uniform and smooth with sandpaper, and the molded surface of the mold is 94%;

[0050] S3, using the combustion of acetylene nozzle in the molded layer of carbon black, carbon black thickness is 0.3 mm.

[0051] The material of the cast coating comprises 120 parts by weight, 60 parts of a blender, 50 suspension, 30 binder, 25 thickeners, 8 defoamer, polypropylene fiber 8 Series, 8 parts of the inorganic, 8 dispersants.

[0052] The fire-resistant aggregate is mixed by thiosphine cement, expanded pearl rock, firefiber and vermiculite, and mixed by weight than 50: 8: 6: 4.

[0053] The binder is mixed with polyurethane, polyurea, and silane coupling agent KH-550 in weight than 20-40: 50: ...

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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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