Additive of green sand casting mould sand for preventing sand fusion and sand inclusion

Abstract

A green sand casting addition which prevents sand adhesion and sand inclusion is characterized in that the addition comprises one of the three following components or the combination thereof: polystyrene foam recycling products, furfural scraps and feldspar powder. The addition can easily produce castings with smooth and clean surfaces, and meet the requirements for producing various castings; the addition has the advantages of simple casting process, high production efficiency, low casting cost, high precision, etc.; the addition can better solve the technical problems of the green sand castings, such as the sand adhesion, the sand inclusion, the sand scabbing, etc.; the castings have the advantages of easier cleaning, high shape stability and more beautiful appearance; and meanwhile, the addition further avoids various defects in using coal powder. Compared with the prior art, the addition has better technical effect and great foreseeable economic and social values.

Description

technical field [0001] The invention relates to casting technology, and in particular provides an anti-sticking and anti-sand inclusion sand additive for wet casting. Background technique [0002] In the foundry industry, the production of castings with a smooth surface has always been the goal pursued by foundry workers, especially for some castings that are directly used without processing or directly assembled after painting. In order to meet the needs of producing different castings, people have developed many modeling methods, among which wet casting occupies a prominent position. It has the advantages of simple process, high production efficiency, low casting cost and high precision, so it has been widely used. According to incomplete statistics, my country's green sand castings account for 70% of the total annual output of castings. [0003] However, in the prior art, when using green sand to produce castings, the surface of the mold cavity is generally not rinsed w...

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, when using green sand to produce castings, the surface of the mold cavity is generally not rinsed with paint; compared with dry molds, wet mold castings are prone to defects such as sand sticking, sand inclusions, and scarring, especially thick-walled castings. Sand is more serious

Due to sticky sand, many technical problems need to be solved urgently: difficult cleaning of castings, deterioration of the performance of castings, damage to the appearance of castings, etc.

With the increasingly serious energy crisis, if coal powder is used in green sand, it will face the danger of being intercepted;

[0007] 2) Due to the low bright carbon generation rate of coal powder, for thick-walled castings, when the amount of coal powder added is insufficient, it cannot play a good anti-sticking effect, but when the amount of coal powder added is large, it will be greatly reduced. The gas permeability of the molding sand has been compromised, and this technical problem is too difficult to solve at present;

[0008] 3) The ash powder residue left after the coal powder is burned reduces the refractoriness of the molding sand, which obviously increases the tendency of the secondary mechanical sand sticking of the molding sand;

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