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

Abstract

The invention belongs to the field of casting of complex hollow single crystal blades, and particularly relates to a wax mold assembly structure of a cover plate integral casting and cantilever structure single crystal blade. Due to the fact that the blade cover plate is integrally cast and the cast hole diameter on the cover plate is small, a blade ceramic core (forming a blade tip cast hole part) is extremely prone to breakage. In addition, the blade is of a cantilever structure and cannot be positioned, so that the defects of core shift, core exposure, mixed crystals, striped crystals and the like of the blade are extremely prone to occurrence in the directional solidification process. However, the combination mode of the wax molds is a main factor influencing the defects. According to the wax mold assembly structure, the ceramic core boss is reasonably designed at the allowance of the blade tip of the blade to solve the problem of core shift of the blade; the freedom degree and the fixed end of the mold core are reasonably designed based on the expansion difference value of the mold core and the mold shell, and mold core breakage is avoided; and the runner position is adjusted to reduce the blade defect forming tendency. The percent of pass of the single crystal blades formed through the mold assembling method is 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

Images