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Investment casting formwork and method of producing the same

A technology of investment casting and manufacturing method, which is applied in the field of investment casting mold shell and its manufacturing, which can solve the problems of high cost and troublesome manufacturing, and achieve the effect of easy painting, good fluidity and uniform mixing

Inactive Publication Date: 2008-03-12
CRRC QISHUYAN INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When manufacturing the formwork, first coat a layer of paint on the wax model, and then sprinkle a layer of sand on the paint. After the paint is dry and hardened, recycle the paint and sand. The surface layer paint is usually 1-2 layers, and the reinforcement layer paint Generally, it is 4 to 5 layers, so generally 6 to 7 layers of paint are required to manufacture a formwork with sufficient strength, and 7 to 8 layers of paint are required for a larger formwork. In order to ensure the strength of the formwork, the reinforcement layer paint After 1 to 2 layers, the upper, middle and lower parts of the formwork should be bound with fine iron wires, and then the remaining reinforcement layer should be applied. Therefore, it is more troublesome to manufacture and the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Construction machinery oil cylinder investment casting mold shell

[0043] The manufacturing method is as follows: first coat a layer of layer paint on the wax model, then sprinkle a layer of sanding material, soak in NH 4 Cl solution, then put it in the air to dry naturally; then apply a second layer of coating on the sanding material, and then sprinkle a second layer of sanding material on the second layer of coating, soak in NH 4 Harden in Cl solution, then put it in the air to dry naturally; after alternately coating and sprinkling 2 layers, start alternately coating and sprinkling reinforcement layer refractory coating and 4 layers of sanding material, during which alternate coating and sprinkling reinforcement layer refractory coating And after 2 layers of sanding material, bind 5-7 thin iron wires on the lower part of the formwork, and then continue to coat the remaining reinforcement layer refractory coating and sanding material. After coating and sanding each l...

Embodiment 2

[0045] Construction Machinery Pound Pick Investment Casting Mold Shell

[0046] The manufacturing method is as follows: first coat a layer of layer paint on the wax model, then sprinkle a layer of sanding material, and then put it in a drying oven to pass ammonia gas to dry; Sprinkle the second layer of sanding material on the second layer of paint, and then put it into the drying oven to pass through the ammonia gas to dry; after alternately coating and sprinkling 2 layers, start to alternately coat and sprinkle the reinforcement layer refractory coating and 3 layers of sanding material, during which After alternately coating and sprinkling 2 layers of reinforcement layer refractory coating and sanding material, tie 5 thin iron wires on the lower part of the formwork, and then continue to coat the remaining reinforcement layer refractory coating and sanding material, after each layer is coated and sanded After immersion in NH 4 l harden in the solution, and then let it dry n...

Embodiment 3

[0048] Construction machinery rake plate investment casting mold shell

[0049] The manufacturing method is as follows: first coat a layer of layer paint on the wax model, then sprinkle a layer of sanding material, and let it dry in the air; Sprinkle the second layer of sanding material on the first layer of paint, and let it dry naturally in the air; after alternately coating and sprinkling 2 layers, start to alternately apply and sprinkle 3 layers of reinforcement layer refractory coating and sanding material, and finish coating each layer After sanding, it is placed in a drying oven and dried with ammonia gas to form a mold shell. The surface layer sanding material is 70-140 mesh corundum sand, and the reinforcement layer sanding material is 10-70 mesh coal gangue sand. The surface layer refractory coating used is c in Table 1 1 No. formula, the refractory coating used for the reinforcement layer adopts B in Table 3 5 No. formula, wherein wollastonite powder is 400 mesh,...

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Abstract

The present invention relates to a casting technology, which, to be specific, is an invest shell casting and a method of manufacturing the invest shell casting. The invest shell casting comprises a plurality of layers of surface refractory coating, a plurality of consolidation layers of refractory coating and sand materials that is positioned between two layers of refractory coating. The present invention is characterized in that the consolidation layers of refractory coating contain wollastonite in power. Utilizing the method can easily increase strength of the invest shell casting at low cost, thereby not only ensuring required strength of the invest shell casting but also reducing layers of the coating and quantity of iron wires. Even with the method used, the iron wires do not need to be used and required strength of the invest shell casting also can be guaranteed, thereby greatly increasing efficiency of manufacturing the invest shell casting and decreasing the amount of human labor needed.

Description

technical field [0001] The invention relates to a casting technology, in particular to an investment casting mold shell and its manufacturing technology. Background technique [0002] The manufacture of the mold shell is a key process in the investment casting process. It not only determines the dimensional accuracy and surface finish of castings, but also directly affects the yield of castings. [0003] Investment casting forms consist of refractory paint and sanding materials. The refractory coating is usually made of refractory powder materials such as corundum powder, quartz powder, bauxite or refractory mud, high-temperature adhesives such as water glass, silica sol or ethyl silicate hydrolyzate, and other additives; Quartz sand and corundum sand are used for the surface layer; refractory sand such as coal gangue sand is used for the reinforcement layer. Formwork thus produced is generally not too strong. When manufacturing the formwork, first coat a layer of paint ...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 姚进法王晓军
Owner CRRC QISHUYAN INSTITUTE CO LTD
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