Evanescent mold ammeter shell
It is a technology of lost foam and electric meter, which is applied in the direction of measuring electrical variables, coatings, instruments, etc. It can solve the problems of difficult filling of the corners of complex castings, and achieve the integrity of the shell structure, high refractoriness, high normal temperature strength and high temperature strength. Effect
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Embodiment 1
[0019] A lost foam ammeter housing, which is prepared according to the following process:
[0020] The EPS beads are injected into the cavity of the mold after foaming once, and the model is formed by expansion under the action of high-temperature steam, and then placed in the coated sand mold, shot through the sand, heated to make it solidify, and then immersed in the pre-prepared refractory coating After taking it out, the refractory coating is evenly coated on the surface of the model so that it does not flow or accumulate. The thickness of the coating is about 1mm. The temperature of the drying room is 50-55°C and the humidity is required to be below 40°C; Finally, a casting is formed; after the casting is formed, a sand shell is formed to remove its outer surface to obtain a completely exposed metal shape; the residual sand grains and oxide scales on the surface of the casting are removed, and the product is obtained.
[0021] The refractory coating is prepared from the f...
Embodiment 2
[0023] A lost foam ammeter housing, which is prepared according to the following process:
[0024] The EPS beads are injected into the cavity of the mold after foaming once, and the model is formed by expansion under the action of high-temperature steam, and then placed in the coated sand mold, shot through the sand, heated to make it solidify, and then immersed in the pre-prepared refractory coating After taking it out, the refractory coating is evenly coated on the surface of the model so that it does not flow or accumulate. The thickness of the coating is about 1mm. The temperature of the drying room is 50-55°C and the humidity is required to be below 40°C; Finally, a casting is formed; after the casting is formed, a sand shell is formed to remove its outer surface to obtain a completely exposed metal shape; the residual sand grains and oxide scales on the surface of the casting are removed, and the product is obtained.
[0025] The refractory coating is prepared from the f...
Embodiment 3
[0027] According to embodiment 1 lost foam method, provide and adopt the coating of the present invention and the carburization data comparison when common coating steel castings are cast, experiment material is No. 45 steel, and comparative test adopts publication number to be that the coating formula that CN101444827 discloses adopts wherein The material of the disappearing appearance is: polystyrene, the material density: 0.022g / cm 3 . The performance results of the specific cast steel are shown in Table 1:
[0028] Table 1
[0029]
[0030] The castings prepared by the invention have a good performance of reducing the carbon content of steel castings, and the cast parts basically meet the mechanical processing requirements of steel castings, and have achieved good practical casting process effects, and have good heat insulation and heat resistance Good brushability, high temperature and low temperature stability and practicability, excellent peeling effect, and...
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