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High-quality molding sand

A kind of molding sand, high-quality technology, applied in the direction of casting molds, cores, casting molding equipment, etc., can solve the problems of poor air permeability of sand molds, rough surface of aluminum sand parts, poor finish, etc., to improve the preservation time and quality, process Short time, high surface quality results

Inactive Publication Date: 2016-08-31
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. In the usual molding sand formula for aluminum casting, the particle size of the molding sand is too large or If it is too small, the diameter of the sand material is too large. Although the air permeability is good, the surface of the aluminum sand parts is rough and the finish is not good. The diameter of the sand material is too small, resulting in poor air permeability of the sand mold and air holes in the aluminum casting

Method used

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Examples

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Effect test

preparation example Construction

[0035] A preparation method of high-quality molding sand is prepared by the following production steps:

[0036] 1) Evenly mix quartz sand, clay, modified sodium bentonite, aluminum sulfate, modified thermoplastic phenolic resin, diatomaceous earth, carboxymethyl cellulose, sodium tripolyphosphate, treated urotropine and starch mixture Afterwards, stir 20 minutes with 500r / min rotating speed;

[0037] 2) Mix sodium silicate, tributyl citrate, polyvinyl acetate, lignocellulose, nano-attapulgite, and brown corundum powder evenly together, and stir for 15 minutes at a speed of 200r / min;

[0038] 3) Grind titanium dioxide and coconut shell activated carbon to a particle size of 0.1-0.2mm, and mix evenly with the materials in 2), stir to disperse, heat to 55°C, and stir at 150r / min for 15 minutes;

[0039] 4) After uniformly mixing the materials in 1) and the materials obtained in 3), add water, stir at a speed of 300r / min for 40 minutes, and mix with water for 15 minutes to make ...

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Abstract

The invention discloses high-quality molding sand. The high-quality molding sand is prepared by the following components: clay, modified sodium bentonite, aluminum sulfate, titanium dioxide, coconut shell activated carbon, sodium silicate, tributyl citrate, polyvinyl acetate, lignocellulose, nanometer attapulgite, brown fused alumina powder, modified thermoplastic phenolic resin, diatomaceous earth, starch, carboxymethylcellulose, sodium tripolyphosphate, urotropin and quartz sand. Through a mutual synergistic effect of the components with a specific ratio, the air permeability of the molding sand can be improved, the strength of the molding sand can be improved, the cost is low, the working procedure time is short, a molding sand sintered layer is thin and a sand adhesion phenomenon seldom occurs, the defects of shrinkage porosity and sand holes of castings are greatly reduced, the problems of sand clamping, recesses, scabs and box collapse caused by an expansion defect of the molding sand can be avoided, the pass percent and the yield of the castings are improved, the defective rate is reduced by 59%, a manufacturing process is simple and practicable, and the production pollution can be reduced.

Description

technical field [0001] The invention relates to the field of molding sand production, in particular to high-quality molding sand. Background technique [0002] Molding sand is a material used for molding in casting. Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. In the usual molding sand formula for aluminum casting, the particle size of the molding sand is too large or If it is too small, the diameter of the molding sand is too large. Although the air permeability is good, the surface of the aluminum sand parts is rough and the finish is not good. If the diameter of the molding sand is too small, the air permeability of the sand mold is not good, and the aluminum castings have pores. [0003] The role of molding sand in foundry production is extremely important. The casting waste caused by poor quality of moldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/02B22C1/16
CPCB22C1/00B22C1/02B22C1/167
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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