Casting molding sand

A technology of casting mold and haosha, which is applied in the field of casting mold sand, which can solve problems such as cracks, shrinkage cavities, and uneven condensation speed of castings, and achieve the effect of uniform condensation speed, enhanced viscosity, and less cracks and shrinkage cavities

Inactive Publication Date: 2015-09-02
LIUZHOU BAITIAN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a kind of foundry sand, which can solve the problems of cracks and shrinkage cavities caused by uneven condensation speed of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] This casting molding sand consists of the following raw materials in parts by weight: 20 parts of quartz sand, 40 parts of haosha, 35 parts of magnesia, 20 parts of clay, 30 parts of water, 5 parts of coal powder, 25 parts of binder, and 10 parts of hardener , 5 parts of starch, the binder is a synthetic resin, the synthetic resin is a phenolic resin, and the hardener is a liquid hardener.

Embodiment 2

[0013] This foundry sand consists of the following raw materials in parts by weight: 28 parts of quartz sand, 50 parts of haosha, 55 parts of magnesia, 38 parts of clay, 50 parts of water, 10 parts of coal powder, 35 parts of binder, and 15 parts of hardener , 10 parts of starch, the binder is a synthetic resin, the synthetic resin is a furan resin, and the hardener is a liquid hardener.

Embodiment 3

[0015] This foundry sand consists of the following raw materials in parts by weight: 25 parts of quartz sand, 45 parts of haosha, 40 parts of magnesia, 29 parts of clay, 38 parts of water, 6 parts of coal powder, 30 parts of binder, and 12 parts of hardener , 7 parts of starch. The binder is a synthetic resin, the synthetic resin is a phenolic resin, and the curing agent is a liquid curing agent.

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PUM

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Abstract

The invention discloses casting molding sand, relating to the technical field of casting. The casting molding sand comprises the following raw materials in parts by weight: 20-28 parts of quartz sand, 40-50 parts of zircon sand, 35-55 parts of magnesia, 20-38 parts of clay, 30-50 parts of water, 5-10 parts of coal dust, 25-35 parts of binder, 10-15 parts of hardener and 5-10 parts of starch. Compared with the prior art, the casting molding sand has the advantage that the problems that cracks and shrinkage cavities are generated on casting surfaces due to non-uniform speed during condensation are solved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to casting sand. Background technique [0002] Various casting defects often occur in the production process of castings, such as trachoma, cracks, pores, shrinkage cavities, etc., and the generation of cracks is related to the condensation speed of castings. In the prior art, quartz sand is used as casting sand to condense castings , but the condensation ability of quartz sand is weak, and the expansion coefficient is large. Simply using quartz sand and clay will cause local sudden expansion of the casting, resulting in local condensation of the casting, which makes the condensation speed of the casting uneven, resulting in stress, and prone to cracks and shrinkage. hole. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a foundry sand, which can solve the problems of cracks and shrinkage cavities caused by uneven conden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/22
Inventor 李丽萍
Owner LIUZHOU BAITIAN MACHINERY
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