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Pre-coated sand for casting and manufacturing method thereof

A technology of coated sand and raw sand, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc. It can solve the problems of easy sand sticking in castings and poor high-temperature performance of coated sand, so as to improve the yield rate, reduce infiltration, Effect of reducing porosity

Inactive Publication Date: 2017-06-09
LIUZHOU LIUJING TECH CO LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-temperature casting coated sand with high temperature performance and less likely to cause sand sticking in castings and its manufacturing method in view of the disadvantages of existing coated sand, such as poor high temperature performance and easy occurrence of sand sticking in castings

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  • Pre-coated sand for casting and manufacturing method thereof

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with embodiment.

[0017] In the coated sand of the present invention, the component content relation of raw sand, phenolic resin, urotropine, and calcium stearate can be based on existing common organic coated sand in raw sand, phenolic resin, urotropine, stearin The components of calcium stearate are configured, for example, with the weight of phenolic resin as a reference, in the coated sand, the weight ratio of the weight of the original sand, urotropine, and calcium stearate to the weight of the phenolic resin is 40-50 (the original sand ), 0.13-0.15 (urotropine), 0.07-0.09 (calcium stearate), and the further component ratio is based on the weight of phenolic resin, the original sand, urotropine, calcium stearate The ratio of weight to phenolic resin weight is 45 (original sand), 0.14 (hexamethylene), 0.08 (calcium stearate)

[0018] The content of the ceramic glaze powder is also based on the we...

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Abstract

The invention relates to pre-coated sand for casting, and aims to overcome the defects that the pre-coated sand is poor in high-temperature performance and casting sand adhering is easily produced. The invention provides the pre-coated sand for casting which comprises crude sand, phenolic resin, methenamine and calcium stearate; in addition, the pre-coated sand for the casting comprises ceramic glaze powder which is in the weight ratio of 0.1 to 0.6 to the phenolic resin. A manufacturing method for the pre-coated sand comprises the following steps: heating the crude sand, and pouring the heated crude sand into a sand mixer; adding the phenolic resin, the ceramic glaze powder and the methenamine in proportions in sequence, wherein the methenamine is added in an aqueous solution mode; after a material is crushed and broken after a coating is cured, stirring the calcium stearate uniformly in a proportion; cooling, screening and packaging. The pre-coated sand provided by the invention is high in high-temperature resistance; if the pre-coated sand for the casting used for high-temperature casting, the rejection rate and the defective rate of products are reduced.

Description

technical field [0001] The present invention relates to a casting molding sand and its manufacturing method, more specifically, to a casting coated sand and its manufacturing method. Background technique [0002] In foundry production, sand sticking in castings is one of the main reasons for unqualified castings. One of the main reasons for sand sticking in castings is related to coated sand cores. , showing that the high temperature performance of coated sand is not enough. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a high-temperature casting coated sand with high temperature performance and less likely to cause sand sticking in castings and its manufacturing method in view of the disadvantages of existing coated sand, such as poor high temperature performance and easy occurrence of sand sticking in castings . [0004] The technical scheme of the present invention for realizing its purpose is as follows: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 任文强
Owner LIUZHOU LIUJING TECH CO LTD
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