Easy-to-demould precoated sand and production process of easy-to-demould precoated sand

A technology of coated sand and easy demoulding, which is applied in the direction of manufacturing tools, metal processing equipment, casting molding equipment, etc., can solve the problems of high friction resistance between molds and sand cores, increase production costs, and reduce production efficiency, so as to improve production Effects of efficiency, friction reduction, high yield and yield

Inactive Publication Date: 2012-09-19
广东省铸力铸材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the complex sand core is demolded, the contact area between the sand core and the mold is large, or the mold design is defective, the frictional resistance between the mold an

Method used

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  • Easy-to-demould precoated sand and production process of easy-to-demould precoated sand

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example one:

[0018] In this embodiment, the easy-release coated sand includes 100kg raw sand, the raw sand is silica sand for foundry; the anti-mucosal liquid is pitch-kerosene liquid, which is 0.1kg; 0.1kg flake graphite powder; 2.0kg novolak resin; 2kg hexamethylenetetramine solution with a concentration of 15%; 0.1kg calcium stearate.

[0019] The production of the present invention is as follows: heat 100kg raw sand to 150~160℃, put it into the sand mixer that has started, add 0.1kg pitch-kerosene liquid, mix for 10s, add 0.1kg flake graphite powder and mix for 10s, add 2.0kg Novolac resin, mix for 40s and blow in cold air for 15s, then add 2kg of hexamethylenetetramine solution (concentration of 15%) and mix for 10s, add 0.1kg of calcium stearate and mix for 15s, blow in cold air for the second time for 30s, Sand is produced to obtain a finished product.

Example Embodiment

[0020] Embodiment two:

[0021] The difference between this embodiment and the first embodiment is that the anti-mucosal liquid added in this embodiment is a paraffin-kerosene solution with a mass of 0.3 kg, while the mass of the added flake graphite powder is 0.25 kg.

[0022] The production steps of the present invention are as follows: heat 100kg of raw sand to 150-160°C, put it into the sand mixer that has started, add 0.3kg of paraffin-kerosene solution, mix for 10s, add 0.25kg of flake graphite powder and mix for 10s, add 2.0 kg novolak resin, mix for 40s and blow in cold air for 15s, then add 2kg of hexamethylenetetramine solution (concentration of 15%) and mix for 10s, add 0.1kg of calcium stearate and mix for 15s, blow in cold air for the second time for 30s , The finished product is made from sand.

Example Embodiment

[0023] Embodiment three:

[0024] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that: in this embodiment, the added anti-mucosal liquid is a coal tar-kerosene solution with a mass of 0.2 kg, and the mass of the added flake graphite powder is 0.15kg.

[0025] The production process of the present invention is as follows: heat 100kg of raw sand to 150-160°C, put it into the activated sand mixer, add 0.2kg of coal tar-kerosene solution, mix for 10s, add 0.15kg of flake graphite powder and mix for 10s, add 2.0kg of phenolic resin, mixed for 40s and then blow in cold air for 15s, then add 2kg of hexamethylenetetramine solution (concentration of 15%), mix for 10s, add 0.1kg of calcium stearate, mix for 15s, blow in cold air for the second time for 30s , The finished product is made from sand.

[0026] In order to better illustrate the technical effects that can be achieved by the present invention, the following comparative example is used for comparison.

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Abstract

The invention provides easy-to-demould precoated sand and a production process of the precoated sand, wherein the easy-to-demould precoated sand has the advantages that the qualified rate of sand core products can be ensured, the production efficiency is improved, and the production cost is reduced. The easy-to-demould precoated sand comprises the following ingredients in parts by weight: 100 parts of crude sand, 1 to 3 parts of phenolic resin, 0.1 to 0.5 parts of anti-mucosa liquid, 0.1 to 0.5 parts of flaky graphite powder, 0.47 to 4.0 parts of methenamine solution and 0.08 to 0.25 parts of calcium stearate. The production process of the easy-to-demould precoated sand comprises the following steps that (1) the crude sand is heated to 150 to 160 DEG C and is added into a sand mixing machine; (2) the anti-mucosa liquid is added into the crude sand, the materials are uniformly mixed, then, flaky graphite is added, the materials are uniformly mixed, phenolic resin is continuously added, and the materials are uniformly mixed; and (3) the crude sand is cooled, the methenamine solution is added to be uniformly mixed, the calcium stearate is continuously added and is uniformly mixed, finally, the cooling sand discharging is carried out, and the easy-to-demould precoated sand is prepared. The easy-to-demould precoated sand and the preparation method can be applied to the field of casting precoated sand core manufacture.

Description

technical field [0001] The invention relates to an easy-release coated sand and a production process of the easy-release coated sand. Background technique [0002] Coated sand refers to the molding sand or core sand that is covered with a layer of solid resin film and hexamethylenetetramine on the surface of the sand before molding. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. Coated sand is used for molding cores of steel castings, iron castings, and non-ferrous metal castings. [0003] Castings made of coated sand have the advantages of high dimensi...

Claims

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Application Information

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IPC IPC(8): B22C9/10B22C1/14
Inventor 刘春晶谢树忠李方义龚杰
Owner 广东省铸力铸材科技有限公司
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