Inorganic coated sand and its manufacturing method
A manufacturing method and technology of coated sand, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problem that inorganic coated sand is not easy to store, and achieve the effect of prolonging the storage time and meeting production requirements
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Embodiment 1
[0022] The raw materials of the coated sand are prepared according to weight percentage, including 5% water glass, 3% sodium bicarbonate, 0.3% microcrystalline paraffin, and the balance is Inner Mongolia Dalin 50 / 100 raw sand (AFS value is 54).
[0023] The manufacturing process is as follows:
[0024] S1: mix the raw sand and water glass evenly in proportion, so that the water glass is evenly covered on the surface of the raw sand;
[0025] S2: heat and solidify the mixed homogeneous material prepared in step S1, the heating temperature is 140 degrees, 5 minutes;
[0026] S3: The material prepared in step S2 is crushed and screened, and cooled to below 45 degrees;
[0027] S4: Add sodium bicarbonate powder and stir evenly in the material obtained in step S3 according to the component ratio; The particle size of sodium bicarbonate powder is less than 70 orders;
[0028] S5: heat and melt the microcrystalline paraffin and add it to the material produced in step S4 according t...
Embodiment 2
[0040] The raw materials of the coated sand are formulated according to weight percentage, including 4% water glass, 4% sodium bicarbonate, 0.2% microcrystalline paraffin, and the balance is 50 / 100 raw sand in Dalin, Inner Mongolia.
[0041] The raw material of above-mentioned weight percent component is produced coated sand according to the manufacturing method in embodiment 1, and according to the test method in implementing 1, the coated sand shelf life and the sand core shelf life of production are tested, and the coated sand shelf life The test results are shown in Table 3.
[0042] Table 3 Shelf life test of coated sand.
[0043]
[0044] Table 4 shows the storage life test results of coated sand cores.
[0045] Table 4 Shelf life test of coated sand cores.
[0046]
[0047] The test results show that the coated sand produced in this example can be stored for more than 30 days in the air, which meets the requirements of use, and the cores made of the coated sand ...
Embodiment 3
[0049] The raw materials of the coated sand are formulated according to weight percentage, including 6% water glass, 5% sodium bicarbonate, 0.4% microcrystalline paraffin, and the balance is 50 / 100 raw sand in Dalin, Inner Mongolia.
[0050] The raw material of above-mentioned weight percent component is produced coated sand according to the manufacturing method in embodiment 1, and according to the test method in implementing 1, the coated sand shelf life and the sand core shelf life of production are tested, and the coated sand shelf life The test results are shown in Table 5.
[0051] Table 5 Shelf life test of coated sand.
[0052]
[0053] The results of the sand core storage life test are shown in Table 6.
[0054] Table 6 Shelf life test of coated sand cores.
[0055]
[0056] The test results show that the coated sand produced in this example can be stored for more than 30 days in the air, which meets the requirements of use, and the cores made of the coated sa...
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Abstract
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