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Molding sand for cast aluminum and preparation method thereof

A molding sand and aluminum casting technology, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of aluminum casting pores, poor air permeability, and aluminum casting scrapping, so as to achieve good air permeability, reduce scrap rate, and avoid air hole defects Effect

Inactive Publication Date: 2014-02-12
TONGLING JINGWEI FLUID SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molding sand used for casting aluminum in the prior art has poor air permeability, which leads to the generation of air holes in the aluminum castings, resulting in the scrapping of the aluminum castings

Method used

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Examples

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Embodiment Construction

[0013] A molding sand for casting aluminum, which is composed of the following raw materials in weight (kg): magnesia 60, red sand 40, coal gangue 12, corundum powder 6, chalk powder 5, bentonite 10, loess 4, glass beads 2.5, Yuanming powder 4, magnesium aluminum silicate 3, polyacrylamide 3, sugar calcium 2, plant ash 1.5, water 7;

[0014] The preparation method of the composite powder is as follows: a. Take perlite, fluorite and barite in a weight ratio of 7:5:3, mix them uniformly, pulverize them through a 150 mesh sieve, and then add water to make a beating to make a solid content of 55%. Slurry, high-speed ball milling for 3 hours, spray drying; b. Add 4% coconut shell powder, 3% calcium fluoride, 2% coal powder and 0.6% yttrium oxide to the spray-dried powder, and calcined at 860°C for 40 minutes , and then heated to 1215°C for calcination for 3 hours, water quenched, then placed in a 16% hydrochloric acid solution, heated to boiling and high-speed grinding for 30 ...

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Abstract

The invention discloses molding sand for cast aluminum and a preparation method thereof. The molding sand is prepared from the following raw materials in parts by weight: 50-70 parts of magnesia, 35-45 parts of red sand, 10-15 parts of coal gangue, 5-10 parts of alundum powder, 4-7 parts of chalk powder, 8-12 parts of bentonite, 3-6 parts of loess, 2-3 parts of glass beads, 3-5 parts of anhydrous sodium sulfate, 2.5-3.5 parts of aluminum-magnesium silicate, 2-4 parts of polyacrylamide, 1.5-2.5 parts of sugar calcium, 1-2 parts of plant ash and 5-9 parts of water. The molding sand has high air permeability, the defect that an air hole is formed in a casting is overcome, the casting is high in surface smooth finish, the rejection rate of the casting can be greatly reduced, the production cost is reduced, and the molding sand has significant economic benefits.

Description

technical field [0001] The invention relates to a molding sand and a preparation method thereof, in particular to a molding sand used for casting aluminum and a preparation method thereof. Background technique [0002] Molding sand is the material used for molding in the casting process. It is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. The quality of molding sand directly affects the performance of castings, such as sand holes, pores, sand inclusions, sand sticking, cracks and other defects. The molding sand used for casting aluminum in the prior art has poor air permeability, which causes air holes in the aluminum casting, and causes the aluminum casting to be scrapped. Contents of the invention [0003] The object of the present invention is to address the deficiencies of the prior art, to provide a casting sand with good air permeability and a preparation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
Inventor 吴寿涛
Owner TONGLING JINGWEI FLUID SCI & TECH
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