Wax mold assembly structure of a single-crystal blade with integral casting of cover plate and cantilever structure

Abstract

The invention belongs to the field of complex hollow single-crystal blade casting, and in particular relates to a wax mold assembly structure of a single-crystal blade with integral casting of a cover plate and a cantilever structure. Since the blade cover plate is integrally cast and the casting hole diameter on the cover plate is small, the ceramic core of the blade (the part where the casting hole of the blade tip is formed) is easily broken. In addition, the blade is a cantilever structure, which cannot be positioned, which leads to defects such as eccentricity, exposed core, and miscellaneous crystals and stripe crystals in the blade during the directional solidification process. However, the combination of wax patterns is the main factor affecting the above defects. The invention solves the problem of blade eccentricity by rationally designing the ceramic core boss at the tip margin of the blade; rationally designing the degree of freedom of the core and the fixed end based on the expansion difference between the core and the shell to avoid fracture of the core; and adjusting the position of the sprue Reduces propensity for blade defect formation. The pass rate of single crystal blades formed by the molding method of the invention is relatively high.

Description

technical field [0001] The invention belongs to the field of complex hollow single-crystal blade casting, and in particular relates to a wax mold assembly structure of a single-crystal blade with integral casting of a cover plate and a cantilever structure. Background technique [0002] Single crystal superalloy blades are the core hot-end components of advanced aerospace, gas turbines and ship engines, and their performance largely determines the comprehensive performance of advanced power systems. [0003] With the continuous development of advanced engines, the traditional process route of separate casting and combined welding of blades and cover plates cannot meet the development needs of engines. Therefore, the integral casting technology of the cover plate is considered to be the development trend of complex hollow blades in the future. In addition, there are few researches on cantilever single crystal blade casting in China at present. [0004] Since the blade cover...

AI Technical Summary

Problems solved by technology

In addition, at present, research on cantilever single crystal blade castings is rarely carried out in China.

[0004] Due to the integral casting of the blade cover plate and the small casting hole diameter on the cover plate, the ceramic core of the blade (the part where the casting hole of the blade tip is formed) is easily broken

In addition, the blade is a cantilever structure, which cannot be positioned, which leads to defects such as core eccentricity, exposed core, and miscellaneous crystals and stripe crystals in the blade during the directional solidification process.

However, the combination of wax patterns is the main factor affecting the above defects

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