Mold core for manufacturing high-temperature alloy hollow blade

Abstract

The invention provides a mold core for manufacturing a high-temperature alloy hollow blade. The mold core is placed in a wax injection mold to fabricate a wax pattern and the wax pattern covered with the mold core is used for fabricating a ceramic mold case; two positioning grooves are formed at the center positions of the front and rear two surfaces of the blade tip core head of the mold core; the positioning grooves are internally tapered grooves and the center lines of the positioning grooves are coincident with each other; and a pair of convex pins matched with the blade tip is arranged corresponding to the blade tip position of the wax injection mold. The mold core for manufacturing the high-temperature alloy hollow blade provided by the invention is characterized in that in mold core design, the shape of the core head part is simplified, and exposure of the blade root core head is eliminated so as to reduce involvement with the wax injection mold and the ceramic mold case, so that core making work becomes easy and the damage of the mold core is reduced. The mold core has certain degree of rotation freedom at the blade top core head in the directional solidification process of the high-temperature alloy hollow blade in the ceramic mold case, and the blade root core head is capable of completely and freely stretching in the vertical direction; therefore, the deformation and breakage of the mold core are greatly reduced, and the yield of the hollow blade is obviously improved.

Description

technical field [0001] The invention relates to precision casting of high-temperature alloy components, in particular to a core for manufacturing high-temperature alloy hollow blades, a wax-pressing mold and a design of a ceramic mold shell. Background technique [0002] In order to increase the working temperature of superalloy turbine blades, people improved the early solid blades into hollow blades, and used air to pass through the complex inner cavity of the blades to cool the blades. The complex cavity of the blade is formed in investment casting with a ceramic core. The ceramic core has to withstand the impact of high pressure and high speed wax liquid during wax pressing, and also has to withstand the impact of high temperature metal liquid and long-term thermal stress during pouring and directional solidification. In particular, shear stress occurs at the rigidly fixed tenon, which becomes an important reason for the fracture of the ceramic core. Reducing the break...

AI Technical Summary

Problems solved by technology

[0004] However, this also often results in a hindrance to the expansion and contraction of the core 2 itself, and it is easy to deform and break the core 2 during wax pressing and pouring and solidification.

Although the blade root core 1 and the blade tip core 3 become free ends to a certain extent by setting gaps at the corresponding protruding parts of the blade root core 1 and the blade tip core 3, but due to the blade root core 1 and the blade tip core 3 The structural reason of the blade top core head 3 is that if the gap is too small, it cannot be freely expanded and contracted, and if it is too large, it will be suspended in the air and will not be able to fix the core, which is very difficult to control

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