Manufacturing method of hollow turbine blade provided with impact hole structure

Abstract

The invention relates to a manufacturing method of a hollow turbine blade provided with an impact hole structure. The method comprises the steps of firstly, preparing a plurality of aluminum oxide ceramic mold cores corresponding to a plurality of main cooling channels in the hollow turbine blade; after that, preparing an impact hole core between every two adjacent aluminum oxide ceramic mold cores, wherein a molybdenum wire is arranged in the center of each impact hole core, and a ceramic layer is arranged on the surface of each impact hole core; assembling the impact hole cores and the plurality of aluminum oxide ceramic mold cores in a combining way, putting the assembled product into a wax mould of the hollow turbine blade; injecting wax into a mold cavity of the wax mould, separating the wax mould after the wax is solidified, and spraying ceramic slurry onto the surface of a wax model to prepare a ceramic mold shell; melting the wax, and carrying out calcination to prepare a ceramic casting mould with a structure comprising the mold cores and the mold shell; and pouring high-temperature molten metal into the ceramic casting mould, and removing the ceramic casting mould after the molten metal is solidified to obtain the hollow turbine blade which comprises the plurality of main cooling channels and the impact hole structure. The manufacturing method mainly solves the problem that the impact hole cores are difficult to mold, are not enough in strength or low in core forming rate in an investment casting process.

Description

technical field [0001] The invention belongs to the technical field of investment casting, and in particular relates to a method for manufacturing a hollow turbine blade with an impact hole structure, which is suitable for the impact hole structure and other complex, small and special-shaped structures with a low molding rate in the existing investment casting. Background technique [0002] Investment casting is a method suitable for manufacturing metal parts with complex geometric features, so it has been widely used in the field of hollow turbine blade manufacturing. In investment casting, injection molding is often used to prepare ceramic cores, but it is very difficult to manufacture mold cavities when preparing complex and fine structural features in cores. In addition, the good fluidity of ceramic powders in the molding process is due to the addition Based on a large amount of organic binder, it is easy to cause cracking of the core, especially the fine structural feat...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to address the deficiencies of the prior art, and to provide a hollow turbine blade manufacturing method with an impact hole structure, which applies light-curing rapid prototyping technology and gel injection molding technology to traditional investment casting, The core of the manufacturing center is the refractory metal molybdenum wire, the surface is the impact hole core of the ceramic layer, and the impact hole core is combined with the core of the main cooling channel of the hollow turbine blade to solve the problem of insufficient strength and easy fracture of the impact hole core

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