Multi-layer module superposition wax mold structure and method for efficiently preparing single crystal blade by using same

Abstract

The invention provides a multi-layer module stacking wax mold structure and a method for efficiently preparing a single crystal blade through the multi-layer module stacking wax mold structure, and relates to the technical field of aero-engine blade precision casting. The invention provides a multi-layer module stacking wax mold structure. The multi-layer module stacking wax mold structure comprises a pouring system wax mold, a blade wax mold, a crystal selector wax mold and a chilling plate wax mold which are sequentially connected from top to bottom. The blade wax mould comprises a plurality of layers of blade wax moulds which are sequentially connected from top to bottom. Under the condition of ensuring the same production capacity of the blade, the module diameter is effectively reduced, and the size requirements on the chilling plate and the directional solidification furnace cavity are reduced; the temperature field distribution in the directional solidification process is obviously improved by reducing the diameter of the module, the uniformity of a transverse temperature field is improved, the isotherm bending degree is reduced, and the front edge temperature gradient of a solid-liquid interface is improved; the defects of the single crystal blade are obviously reduced, the tendency of mixed crystal generation at the transition section and the platform is reduced, and the qualified rate of mass production of the single crystal blade is effectively improved.

Description

technical field [0001] The invention relates to the technical field of precision casting of aero-engine blades, in particular to a multi-layer module superimposed wax mold structure and a method for efficiently preparing single crystal blades. Background technique [0002] Single crystal blade is an important part of aero-engine, and single-crystal blade for aero-engine is generally prepared by investment casting method. First, the structural design of the module is carried out, the wax mold is pressed and assembled, the wax mold module is degreasing, and then the mold shell is prepared by coating, sanding, dewaxing, and roasting. Finally, the molten alloy liquid is poured and fixed on the In the mold shell of the high-vacuum directional solidification furnace, the mold is pulled to the cooling area, and the vacuum is broken after the solidification is completed. [0003] Among them, the structural design of the module, as the initial step of single crystal blade production...

AI Technical Summary

Problems solved by technology

At present, the module structure for mass production of single-crystal blades in the industry is generally a single-layer module, that is, the blades are arranged in a single layer; under the condition that the production capacity of single-crystal blades remains unchanged, the diameter of the single-layer module On the one hand, the size of the quenching plate and directional solidification furnace cavity is required to be large; on the other hand, the distribution of the lateral temperature field during the directional solidification process is uneven, the isotherm is bent, the temperature gradient at the front of the solid-liquid interface is small, and the transition section and platform miscellaneous crystals are prone to appear Solidification defects such as solidification restrict the production pass rate of single crystal blades

[0004] The wax module trees disclosed in Chinese patents CN107931523A and CN210730902U are all single-layer module structures commonly used in industry at present, that is, the blades are arranged in a single layer around the center of the module; Structure When increasing the number of blades in the module to increase production capacity, it will inevitably lead to an increase in the diameter of the module, which in turn increases the requirements for the size of the chilling plate and the cavity of the directional solidification furnace

[0007] To sum up, single-layer modules are commonly used in mass production of single-crystal blades in the prior art. The diameter of such single-layer modules is relatively large. On the one hand, the chilling plate and the cavity of the directional solidification furnace are required to have a large size; On the other hand, the temperature field distribution in the process of directional solidification deteriorates, including the inhomogeneity of the lateral temperature field, the bending of the isotherm, and the small temperature gradient at the front of the solid-liquid interface, which leads to an increase in the formation tendency of miscellaneous crystals and seriously reduces the size of single crystal blades. Pass rate of mass production

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