Molding sand for casting
A technology of molding sand and silica sand, which is used in casting molding equipment, molds, cores, etc., can solve the problems of weak condensation capacity of quartz sand, uneven condensation speed of castings, easy cracks and shrinkage holes, etc. Cracks and shrinkage cavities, the effect of reducing the coefficient of expansion
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Embodiment 1
[0018] A molding sand for casting, which is composed of the following raw materials in parts by weight: 40 parts of chromite sand, 40 parts of pearl sand, 0.6 parts of binder, 25 parts of silica sand, 8 parts of hao sand, 20 parts of magnesia, 4.5 parts of olivine sand share.
[0019] The content of silica in silica sand is 92-95%, alumina 0-5%, and the balance is unavoidable impurities. The particle size is 100-150 mesh, and the average fineness is 60-80.
[0020] The particle size of chromite sand is 50-100 mesh.
[0021] The binder is a mixture of phenolic resin, polyvinyl alcohol, and furan resin, and the mass ratio of the phenolic resin, polyvinyl alcohol, and furan resin is 5:1:4.
[0022] The content of zirconia in Haosha is more than 70%, the content of silicon oxide is less than 20%, the content of titanium oxide is less than 0.3%, the content of iron oxide is less than 0.12%, the content of aluminum oxide is less than 0.2%, and the particle size is 100-160 mesh.
Embodiment 2
[0024] A molding sand for casting, which is composed of the following raw materials in parts by weight: 35 parts of chromite sand, 45 parts of pearl sand, 1 part of binder, 30 parts of silica sand, 10 parts of hao sand, 18 parts of magnesia, 3 parts of olivine sand share.
[0025] The content of silica in silica sand is 92-95%, alumina 0-5%, and the balance is unavoidable impurities. The particle size is 100-150 mesh, and the average fineness is 60-80.
[0026] The particle size of chromite sand is 50-100 mesh.
[0027] The binder is a mixture of phenolic resin, polyvinyl alcohol, and furan resin, and the mass ratio of the phenolic resin, polyvinyl alcohol, and furan resin is 5:1:4.
[0028] The content of zirconia in Haosha is more than 70%, the content of silicon oxide is less than 20%, the content of titanium oxide is less than 0.3%, the content of iron oxide is less than 0.12%, the content of aluminum oxide is less than 0.2%, and the particle size is 100-160 mesh.
Embodiment 3
[0030] A molding sand for casting, which is composed of the following raw materials in parts by weight: 35 parts of chromite sand, 40 parts of pearl sand, 0.2 part of binder, 20 parts of silica sand, 5 parts of hao sand, 25 parts of magnesia, 6 parts of olivine sand share.
[0031] The content of silica in silica sand is 92-95%, alumina 0-5%, and the balance is unavoidable impurities. The particle size is 100-150 mesh, and the average fineness is 60-80.
[0032] The particle size of chromite sand is 50-100 mesh.
[0033] The binder is a mixture of phenolic resin, polyvinyl alcohol, and furan resin, and the mass ratio of the phenolic resin, polyvinyl alcohol, and furan resin is 5:1:4.
[0034] The content of zirconia in Haosha is more than 70%, the content of silicon oxide is less than 20%, the content of titanium oxide is less than 0.3%, the content of iron oxide is less than 0.12%, the content of aluminum oxide is less than 0.2%, and the particle size is 100-160 mesh.
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