Preparation method of wall thickness controllable directional solidification casting mould

Abstract

The invention discloses a preparation method of a wall thickness controllable directional solidification casting mould. The preparation method comprises the steps of: firstly, designing an initial casting mould in three-dimensional software; then, placing the initial casting mould into casting software to finish stress calculation, and determining the optimal casting mould wall thickness; next, placing a secondary casting mould into a directional crystal growth simulation environment to carry out radiative heat transfer calculation, analyzing a temperature field distribution rule and a thermal field change rule, changing the wall thickness and giving a wall thickness close to a directional solidification growth temperature gradient rule; repeating the radiative heat transfer calculation and stress check, and revising the design until the final three-dimensional design of the casting mould is determined; and manufacturing the casting mould based on a rapid manufacturing method for a rapidly-molded ceramic casting mould. The method is used for solving the problem that the casting mould affects the growth of a directional crystal in the direction solidification process of a complex high-temperature alloy structure, thus a directional crystal blade can be more easily obtained, higher-quality directional crystal products can be obtained, and problems such as crack and stress deformation caused by hot stress and other stresses are avoided to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of directional solidification casting molds, and relates to a preparation method of a directional solidification casting mold with controllable wall thickness. Background technique [0002] Directional solidification is the application of technical means in the solidification process to establish a temperature gradient in a specific direction at the liquid-solid interface, so that the melt solidifies in the direction opposite to the heat flow, and finally obtains a directional structure, even a single crystal. The emergence of directional solidification technology has improved the mechanical properties of superalloys, especially the engine blades of superalloys produced in the aviation field. Compared with castings obtained by ordinary casting methods, it improves the high temperature strength, creep resistance and durability of the blades. The thermal fatigue performance is greatly improved. In addition, d...

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Problems solved by technology

[0005] The problem solved by the present invention is to provide a method for preparing a directional solidification casting mold with controllable wall thickness, which solves the problem that the traditional casting medium shell is difficult to accurately control and the temperature field of the shell during the directional solidification process is accurately controlled, thereby improving the complex structure of superalloys. directional solidification quality

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