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Double-layer hollow cylinder investment shell structure for vacuum suction casting process of high temperature resistant alloy

A high-temperature-resistant alloy and vacuum suction casting technology, applied in the field of precision casting, can solve problems such as vacuum suction casting of difficult-to-resistance high-temperature alloys, dangerous accidents, etc.

Active Publication Date: 2019-02-05
SHANGHAI SINOTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength and air permeability of the fully enclosed formwork structure are a pair of contradictory properties, which makes it difficult for most formwork structures on the market to be suitable for vacuum suction casting of high temperature resistant alloys.
If forced production is prone to various dangerous accidents

Method used

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  • Double-layer hollow cylinder investment shell structure for vacuum suction casting process of high temperature resistant alloy
  • Double-layer hollow cylinder investment shell structure for vacuum suction casting process of high temperature resistant alloy
  • Double-layer hollow cylinder investment shell structure for vacuum suction casting process of high temperature resistant alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The formwork structure is a double-layer structure, the outer layer is an outer shell, and the inner layer is a hollow cylinder structure. The hollow cylinder is connected to the outer shell through an intermediate connector; a molten steel circulation is provided between the hollow cylinder and the outer shell. The steel liquid flow channel is connected with the formwork casting on the outer side of the outer shell through the runner, the upper end of the formwork structure is provided with a platform, and the lower end of the formwork structure is provided with a reinforcement structure.

[0025] There are 12 intermediate connectors evenly distributed between the inner layer and the outer layer, and the intermediate connectors are arranged in groups of 3 in the steel liquid flow channel between the inner layer and the outer layer. The distance between them is equal. The intermediate connector has a sheet-like structure, with a bending groove in the middle, and the int...

Embodiment 2

[0028] The mold shell structure is a double-layer structure, the outer layer is an outer shell, and the inner layer is a hollow cylinder structure, and the hollow cylinder is connected with the outer shell through an intermediate connector; the hollow cylinder is designed for the rise and fall of the alloy solution and the gas emissions. To ensure the smooth rise of the alloy solution in the filling stage of the casting and the rapid return of the alloy solution in the hollow through the inner alloy solution in the pressure relief stage.

[0029] There is a steel liquid flow channel between the hollow cylinder and the outer shell, and the steel liquid flow channel is connected with the formwork casting on the outside of the outer shell through the runner. The upper end of the formwork structure is provided with a platform, and the lower end of the formwork structure is provided with a reinforcement structure. Formwork castings are distributed around the formwork structure, an...

Embodiment 3

[0031] There are 6-20 intermediate connectors evenly distributed between the inner layer and the outer layer. The intermediate connectors are in a sheet structure, with a bending groove in the middle, and the intermediate connectors are arranged obliquely between the inner and outer layers. The angle range between the intermediate connector and the outer layer is 20-50 degrees, and the thickness ratio between the inner layer and the outer layer is 1:0.8-1.2, thus forming a double-layer hollow cylinder structure, the purpose of which is to reduce the charging The amount of alloy solution needed in the molding stage and the best temperature control effect. The bottom of the hollow cylinder is provided with a semicircular structure, and the semicircular structure is provided with a flow channel control part. The beginning of the stream channel.

[0032] The purpose of designing the stiffener structure at the bottom of the formwork is to improve the strength of the formwork. Ens...

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Abstract

The invention relates to a double-layer hollow cylinder fusion mold shell structure for a heat-resistant alloy vacuum suction casting technology. The double-layer hollow cylinder fusion mold shell structure is characterized in that the mold shell structure is of a double-layer structure, the outer layer is an outer shell, the inner layer is of a hollow cylinder structure, and the hollow cylinder is connected with the outer shell through middle connecting pieces; a molten steel flow channel is formed between the hollow cylinder and the outer shell, and connected with mold shell castings through pouring gates, wherein the mold shell castings are arranged on the outer side of the outer shell; and a platform is arranged at the upper end of the mold shell structure, and a reinforcing structure is arranged at the lower end of the mold shell structure. A mold shell with the structure is applied to the heat-resistant alloy vacuum suction casting technology and is high in safety factor. The castings are dense in organization, small in size of crystal grains and small in number of shrinkage cavity and shrinkage porosity defects, the yield rate is likely to be above 90%, and the casting energy sources are saved by above 80%.

Description

technical field [0001] The invention relates to the technical field of precision casting, in particular to a double-layer hollow cylinder investment mold shell structure used in a high-temperature-resistant alloy vacuum suction casting process. Background technique [0002] Vacuum suction casting is a special casting process and an advanced casting technology. Because of its high utilization rate of liquid metal, high casting precision, high quality, energy saving, low cost and other advantages, it is widely used in the manufacture of many important precision castings such as commercial machinery, gun parts, steam turbine blades, missile wings, etc. in developed countries . This technology was patented by the American Hitchiner Company in 1975, and the core technology was blocked. At present, vacuum suction casting is mainly used in precision casting of low-temperature alloys such as aluminum alloys in China, and is rarely used in precision casting of high-temperature resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/06
CPCB22D18/06
Inventor 严元众陈良
Owner SHANGHAI SINOTEC
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