High-bonding-strength modified water glass sand for pump valve casting and manufacturing method of high-bonding-strength modified water glass sand

Abstract

The invention discloses high-bonding-strength modified water glass sand for a pump valve casting. A modified water glass bonding agent in the water glass sand is superior to a conventional water glass bonding agent in normal-temperature and normal-humidity strength, thixotropy and the rheological property are better, reaction bonding activity is high, and environment friendliness is achieved; the modified water glass bonding agent improves the bonding strength greatly together with yttrium oxide sol, the use amount of water glass is greatly reduced, and scattering cleaning and recycling of sand are easier; in addition, permeability resistance of the surface of molding sand can be effectively improved through sericite powder added in the sand, and defects on the surface of the casting due to molten metal permeation are avoided; and nanometer calcium fluoride loaded by bentonite is scattered in sand and has the effects of lubricating and strengthening, a non-stick permeation-preventing layer can be formed, and sand clamping and sand sticking of the casting are further prevented. The composite modified water glass sand is good in comprehensive performance, and the high-quality pump valve casting can be manufactured.

Description

technical field [0001] The invention relates to the technical field of water glass sand, in particular to a modified water glass sand with high bonding strength for pump and valve castings and a preparation method thereof. Background technique [0002] Molding sand is mainly a kind of material used for molding in casting, which is made by mixing sand materials, adhesives and auxiliary substances according to different proportions. According to the different adhesives used, it can be divided into clay sand and water glass sand. , resin sand, etc. Among them, water glass sand has the advantages of high strength, low cost, simple process, and low pollution, and is widely used. [0003] Castings of pumps and valves have the characteristics of thin walls and complex shapes. In the casting process, the quality requirements for molding sand are particularly strict. The quality of molding sand is also an important factor related to the quality of castings. Although water glass moldi...

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Problems solved by technology

[0003] Castings of pumps and valves have the characteristics of thin walls and complex shapes. In the casting process, the quality requirements for molding sand are particularly strict. The quality of molding sand is also an important factor related to the quality of castings. Although water glass molding sand has significant advantages, there are also many Disadvantages, obvious defects are mainly manifested in low strength at room temperature, poor collapsibility, and difficulty in regenerating old sand. If it is not modified, it is difficult to improve the quality of pump valve castings