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Easily-cooled modeling sand for aluminum alloy casting

A technology of molding sand and aluminum alloy, which is used in casting molding equipment, molds, cores, etc., can solve the problems of difficulty in guaranteeing the quality of castings, single component composition, and low operation efficiency, saving high costs and improving economy. Benefit, the effect of reducing production costs

Inactive Publication Date: 2015-03-11
NINGGUO WANNAN FITNESS MATERIAL
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AI Technical Summary

Problems solved by technology

In this way, not only the operating efficiency is low, but the labor intensity of the workers is high, and the quality of the castings is difficult to guarantee.
[0004] The traditional molding sand is relatively single in composition, which cannot meet the needs of V-method vacuum molding

Method used

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Embodiment Construction

[0021] In order to make it easy to understand the technical means, creative features, goals and effects achieved by the present invention, the present invention will be further explained in conjunction with specific embodiments below.

[0022] An easy-to-cool molding sand for aluminum alloy casting, which is composed of the following parts by weight: 80 parts by weight of natural quartz sand, 15 parts by metal shot, 5 parts by agate ball, 5 parts by modified sodium silicate sand, and resin sand 5 copies;

[0023] Adding a certain amount of granular metal pellets and agate balls into the modeling sand, the heat transfer coefficient of the metal is large. After the aluminum alloy solution fills the cavity, the surface of the casting is solidified sequentially under the action of the chilled sand containing the metal pellets, and the surface solidification speed of the casting is accelerated. Dendrites are too late to grow, so the result is a fine and dense crystal structure. The fine...

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Abstract

The invention discloses an easily-cooled modeling sand for aluminum alloy casting. The modeling sand is characterized by being composed of the following components in parts by weight: 70 to 90 parts of natural quartz sand, 10 to 20 parts of metal pill, 4 to 6 parts of agate ball, 4 to 15 parts of modified used sodium silicate sand, and 4 to 15 parts of resin sand. The modeling sand contains a certain amount of particle-shaped metal balls and agate balls, and because of the large heat transfer coefficient of metal, when the molten aluminum alloy is full of a cavity, the casting surface will be cured in sequence under the rapid cooling effect of the modeling sand containing metal pills. The curing speed of the casting surface is accelerated, and thus the branch crystal does not have enough time to grow up, so a fine and compact crystalline structure will be obtained. The finer the casting grain is, the secondary phase, shrinkage porosity, and pores among crystal axes will be more evenly dispersed, and even no casting defect will appear.

Description

Technical field [0001] The present invention relates to the technical field of casting, in particular to an easy-to-cool modeling sand for aluminum alloy casting. Background technique [0002] V-method vacuum molding is the third-generation molding method after mechanical molding and chemical molding. The specific process is to prepare a mold with an exhaust chamber. The mold has vent holes that can be directly connected to the vacuum tube of the exhaust chamber. The EVA film is placed under the film dryer and heated to a softened state. Vacuum is applied to the softened plastic film through the vent on the mold to make it closely adhere to the mold. The negative pressure flask is placed on the mold, and the flask is The dry sand is filled, the maximum density of the dry sand is obtained through the vibration equipment, and a layer of sealing film is covered on the top of the sand mold, and the sand box is vacuumed to cause the pressure difference between the inside and outside o...

Claims

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Application Information

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IPC IPC(8): B22C1/00
CPCB22C1/00
Inventor 胡刚
Owner NINGGUO WANNAN FITNESS MATERIAL
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