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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

Inactive Publication Date: 2017-11-24
STATE GRID SHANDONG ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the embodiments of the present invention is that, in view of the problem that the corners of complex castings are difficult to fill when the current lost foam forging method is used to produce the electric meter casing, a lost foam electric meter casing is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention belongs to the field of electrical equipment and discloses an evanescent mold ammeter shell. The evanescent mold ammeter shell is prepared and obtained according to the following process that EPS beads are subjected to foaming once and then are poured into a mold cavity, a model is formed through expansion under the action of high-temperature steam, is put into a precoated sand mold, is solidified through sand jetting and heating, is immersed into fireproof paint prepared in advance, and is taken out, and the surface of the model is evenly coated with the fireproof paint; liquid metal is poured into a mold, and a casting is formed after cooling; after the casting is formed, a sand shell without the outer surface is formed so as to obtain the needed metal shape which is exposed completely; and residual sand grains and an oxide skin on the surface of the casting are removed, and the evanescent mold ammeter shell is obtained. The evanescent mold ammeter shell is complete in structure, filling of all corners is good, and fire resistance is good.

Description

technical field [0001] The invention belongs to the field of electric equipment, and specifically discloses a lost foam electric meter housing. Background technique [0002] The electric meter is the abbreviation of the electric energy meter. It is an instrument used to measure electric energy, also known as the electric meter, the fire meter, the electric energy meter, and the kilowatt-hour meter. The ammeter case mainly plays the role of protecting the internal parts of the ammeter, which requires good mechanical properties, good thermal stability and flame retardancy. At present, the housing materials of electric meters in China mostly use flame-retardant ABS. Although flame retardant ABS is cheap, its rigidity is not very good. [0003] The lost foam negative pressure casting method is to bond the plastic foam model with the same size and shape as the casting and the riser system made of the same material to form a model cluster, brush the lost foam paint and dry it,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C3/00B22C9/24G01R11/04
CPCB22C9/046B22C3/00B22C9/24G01R11/04
Inventor 谢晓东张振鲁王洪志王萌萌张学芹
Owner STATE GRID SHANDONG ELECTRIC POWER
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