High-temperature-resistant molding sand
A technology of high temperature resistant mold and silica sand, which is used in casting molds, cores, casting molding equipment, etc. Cost, smooth surface effect
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Embodiment 1
[0019] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 120, bentonite 7, kaolin 4, talcum powder 2.1, titanium dioxide 1.4, soybean meal 5, sepiolite 3, zinc borate 0.7, sodium silicate 0.5.
[0020] Described soybean meal, fat content is 7%.
[0021] A method for preparing high temperature resistant molding sand, comprising the following steps:
[0022] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;
[0023] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand m...
Embodiment 2
[0029] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 125, bentonite 8, kaolin 5, talcum powder 2.2, titanium dioxide 1.5, soybean meal 6, sepiolite 4, zinc borate 0.8, sodium silicate 0.6.
[0030] Described soybean meal, fat content is 8%.
[0031] A method for preparing high temperature resistant molding sand, comprising the following steps:
[0032] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;
[0033] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand m...
Embodiment 3
[0039] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 130, bentonite 9, kaolin 6, talcum powder 2.3, titanium dioxide 1.6, soybean meal 7, sepiolite 5, zinc borate 0.9, sodium silicate 0.7.
[0040] Described soybean meal, fat content is 9%.
[0041] A method for preparing high temperature resistant molding sand, comprising the following steps:
[0042] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;
[0043] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand mix...
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