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Method for customizing core and shell of integrated ceramic mold of hollow turbine blade

A technology for turbine blades and ceramic castings, which is applied in the directions of castings, cores, and casting components, and can solve the problems of air-film hole diameter reduction, eccentric core perforation defects, installation errors, etc., so as to improve porosity and improve sintering. the effect of strength

Active Publication Date: 2015-04-29
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, blades with high-efficiency cooling structures have changed from single-wall to double-wall, and the aperture of the air film is also shrinking, and the internal cooling structure is more complex, which poses challenges to traditional turbine blade manufacturing technology
Specifically, the shortcomings of the investment casting process are reflected in the installation errors in the combination process of the core and the wax mold, the eccentric core perforation defects in the casting process, and the complicated and lengthy process.

Method used

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  • Method for customizing core and shell of integrated ceramic mold of hollow turbine blade
  • Method for customizing core and shell of integrated ceramic mold of hollow turbine blade
  • Method for customizing core and shell of integrated ceramic mold of hollow turbine blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The method for customizing the core shell of the hollow turbine blade integrated ceramic mold includes the following steps:

[0059] 1) The hollow turbine blade resin mold is made by light-curing rapid prototyping equipment, and the resin used for molding is 8981 resin. The resin mold is designed with 4 gates, one of which is used to pour the shell, and 3 are used to pour the core, the prototype of the light-cured blade (simplified) and the CAD model of the resin mold are as follows figure 1 , figure 2 shown.

[0060] 2) Based on the gel injection molding process, making ceramic slurry:

[0061] First, dissolve the organic monomer AM (acrylamide) and the cross-linking agent MBAM (N,N′-methylenebisacrylamide) into deionized water according to the mass ratio of 24:1, and then add an appropriate amount of dispersant (the dispersant is added The amount is 2% of the mass of the powder), stirred and dissolved, and prepared into a premixed solution with an organic concentr...

Embodiment 2

[0072] The method for customizing the core shell of the hollow turbine blade integrated ceramic mold includes the following steps:

[0073] 1) The hollow turbine blade resin mold is made by light-curing rapid prototyping equipment, and the resin used for molding is 8981 resin. The resin mold is designed with 4 gates, one of which is used for pouring the shell, and the other 3 are used for pouring the core.

[0074] 2) Based on the gel injection molding process, making ceramic slurry:

[0075] First, dissolve the organic monomer AM (acrylamide) and the cross-linking agent MBAM (N,N′-methylenebisacrylamide) into deionized water according to the mass ratio of 24:1, and then add an appropriate amount of dispersant (the dispersant is added The amount is 2% of the mass of the powder), stirred and dissolved, and prepared into a premix with an organic concentration of 20%.

[0076] 2) Weigh powder 1 and powder 2 according to a certain ratio, and stir and mix the powder in the contai...

Embodiment 3

[0085] The method for customizing the core shell of the hollow turbine blade integrated ceramic mold includes the following steps:

[0086] 1) The hollow turbine blade resin mold is made by light-curing rapid prototyping equipment, and the resin used for molding is 8981 resin. The resin mold is designed with 2 gates, one for pouring the shell and one for pouring the core.

[0087] 2) Based on the gel injection molding process, making ceramic slurry:

[0088] First, dissolve the organic monomer AM (acrylamide) and the cross-linking agent MBAM (N,N′-methylenebisacrylamide) into deionized water according to the mass ratio of 24:1, and then add an appropriate amount of dispersant (the dispersant is added The amount is 2% of the mass of the powder), stirred and dissolved, and prepared into a premix with an organic concentration of 20%.

[0089] 2) Weigh powder 1 and powder 2 according to a certain ratio, and stir and mix the powder in the container evenly;

[0090] In parts by m...

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Abstract

The invention discloses a method for customizing a core and a shell of an integrated ceramic mold of a hollow turbine blade. The method comprises the following steps of: preparing alumina-based ceramic slurry with different prescriptions; simultaneously casting the core and the shell of the hollow turbine blade by using different types of ceramic slurry under a vacuum environment; performing vacuum freeze drying and sintering to obtain the core and the shell of the ceramic mold with different components and different performances. In consideration of difference in stress states between the core and the shell and between different cores during pouring of molten metal, and difference in core stripping difficulty between the different cores, the ceramic mold can meet a requirement for pouring of the molten metal through the core and the shell with different components and different mechanical performances.

Description

technical field [0001] The invention belongs to the technical field of rapid casting, and relates to a method for customizing a core and shell of a hollow turbine blade integrated ceramic mold. Background technique [0002] Turbine blades are critical parts of aero engines and gas turbines. The increase of gas temperature can effectively increase the output power of the gas turbine and save fuel. Since the temperature that the heat-resistant alloy used to make turbine blades can withstand has reached its limit, hollow turbine blades with complex air-cooling structures have emerged. The traditional hollow blade manufacturing method is investment casting, and its process includes core mold preparation, core making, wax mold preparation, core and wax mold assembly, wax mold preparation, ceramic slurry coating, shell making, There are multiple process steps such as wax melting, roasting, pouring metal, and core removal, among which the preparation of ceramic core and shell is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/00C04B35/622B28B1/26
Inventor 李涤尘鲁中良荆慧
Owner XI AN JIAOTONG UNIV
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