Coated sand. Sand surface in the shape before that is covered with a layer of solid resin film of sand or sand. There are two kinds of cold and thermal coating process: cold method of ethanol resin will dissolve, and in the process of mixing sand by adding urotropine, so that both coated in the sand surface, ethanol volatilization, in coated sand; heat Method to preheat the sand to a certain temperature, add resin to melt, stirring the resin coated on the sand surface, plus Wu Loti care solution and lubricant, cooling, crushing, sieving to get coated sand. For cast steel, cast iron parts.
main feature:
1, vibration sand, high strength, low gas, low expansion;
2, lax good, casting surface finish high;
3, shell layer can not afford, good thermal stability, good thermal conductivity, mobility, casting surface smooth;
4, high strength, high temperature, low expansion, good mold release, good anti-stick sand;
5, shell layer is not even shelling, curing speed;
main ingreadient:
Coated sand mainly uses high-quality selection of natural quartz sand for the original sand, thermoplastic phenolic resin, Urotropine and enhancer as raw materials. According to the different technical needs of users, in the curing speed, stripping, liquidity, collapsibility, casting surface finish, storage and other aspects of the appropriate adjustment ratio. Is the car, tractors, hydraulic parts, such as one of the best modeling materials.
Development History:
Coated sand by the German Dr. Kroning invented during World War II, the process is the powder of the thermosetting phenolic resin and mechanical mixing of the original sand, when heated curing. After the development of thermoplastic phenolic resin with latent curing agent (Urotropine) and lubricant through a certain coating process preparation of coated sand, when covered with sand coated sand on the surface of resin melting resin, in the Ukraine Rotto decomposition of methylene under the action of the molten resin from the linear structure of the rapid transformation of non-melting body structure, so that the curing of sand molding molding.
China's coated sand technology began in the mid-20th century 50's, 60's was once disabled. In the 1980s, due to the rapid development of the automobile industry and the export of mechanical products, the quality of castings was put forward higher requirements, thus promoting the rapid development of coated sand production and application technology [1]. In 1986, Jinan Institute of Forging and Forging Technology developed a new type of coated sand production technology. The amount of resin added decreased from 6 to 10% in the early 1980s to 3 to 4%, close to the international advanced level in the same period. In the early 1990s, the coated sand factories all over the country developed rapidly. New products and new technologies are emerging. In the 21st century, the annual output and sales volume of the coated sand industry in China has reached 900,000 tons, which is widely used in automobile cylinder and cylinder Cover, intake manifold, all kinds of pipe fittings, pump and other complex casting production.
main feature:
1, vibration sand, high strength, low gas, low expansion;
2, lax good, casting surface finish high;
3, shell layer can not afford, good thermal stability, good thermal conductivity, mobility, casting surface smooth;
4, high strength, high temperature, low expansion, good mold release, good anti-stick sand;
5, shell layer is not even shelling, curing speed;
main ingreadient:
Coated sand mainly uses high-quality selection of natural quartz sand for the original sand, thermoplastic phenolic resin, Urotropine and enhancer as raw materials. According to the different technical needs of users, in the curing speed, stripping, liquidity, collapsibility, casting surface finish, storage and other aspects of the appropriate adjustment ratio. Is the car, tractors, hydraulic parts, such as one of the best modeling materials.
Development History:
Coated sand by the German Dr. Kroning invented during World War II, the process is the powder of the thermosetting phenolic resin and mechanical mixing of the original sand, when heated curing. After the development of thermoplastic phenolic resin with latent curing agent (Urotropine) and lubricant through a certain coating process preparation of coated sand, when covered with sand coated sand on the surface of resin melting resin, in the Ukraine Rotto decomposition of methylene under the action of the molten resin from the linear structure of the rapid transformation of non-melting body structure, so that the curing of sand molding molding.
China's coated sand technology began in the mid-20th century 50's, 60's was once disabled. In the 1980s, due to the rapid development of the automobile industry and the export of mechanical products, the quality of castings was put forward higher requirements, thus promoting the rapid development of coated sand production and application technology [1]. In 1986, Jinan Institute of Forging and Forging Technology developed a new type of coated sand production technology. The amount of resin added decreased from 6 to 10% in the early 1980s to 3 to 4%, close to the international advanced level in the same period. In the early 1990s, the coated sand factories all over the country developed rapidly. New products and new technologies are emerging. In the 21st century, the annual output and sales volume of the coated sand industry in China has reached 900,000 tons, which is widely used in automobile cylinder and cylinder Cover, intake manifold, all kinds of pipe fittings, pump and other complex casting production.
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Keywords:Coated Sand,Wikipedia,Development History
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