Method for casting mould core and shell integrated ceramic

Abstract

The invention is concerned with a kind of ceramic mould method with integrated mould core and mould shell. At first, produce the resin mould with loss-on-ignition character with laser quick shaped technology and the resin mould has complex inner cavity and figure structure to form integrated cooling channel. Mix ceramic grain, organic substance and deionwater into ceramic slurry and keep the ceramic slurry filling the whole resin mould by controlling the pressure of ceramic slurry. Pour the slurry with vibration to get close-grained ceramic mould core and mould shell, after solidify, the mould core and mould shell will connect with through ceramic slurry and it gets the integrated ceramic mould by drying, heating to degrease and sintering. The ceramic mould core and mould shell connects as a whole and formed in once without assembly and this keep the precision of position between ceramic mould core and mould shell. This ceramic mould is fit to produce the mould with thin wall and complex cavity structure, such as gas turbine engine vane and enhances the percent of pass to mould greatly.

Description

technical field [0001] The present invention relates to the technical field of investment casting, in particular to investment casting of thin-walled castings with a complex inner cavity structure (at least capable of forming a cooling passage), in particular to a method for manufacturing a core and shell integrated ceramic mold . Background technique [0002] During the working process of a gas turbine engine, the blades of the gas turbine engine must be able to withstand the impact of high temperature and high pressure airflow for a long time. With the continuous increase of the power of the gas turbine engine and the continuous increase of the temperature before the turbine, its service temperature often exceeds Therefore, in the design process of gas turbine engine blades, complex cooling channels should be designed inside, and the blades (especially moving blades) can be efficiently cooled by cooling media such as air and steam. Since the relativ...

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Problems solved by technology

[0004] Due to the positioning error and assembly error in the process of assembling the ceramic core to the wax mold, and poor stability, it will deviate from the original position during the subsequent wax injection and dewaxing process and under the action of high-temperature metal liquid, thus directly affecting the ceramic core. The mutual position accuracy of the core and the shell will cause the phenomenon of eccentricity, which will affect the dimensional accuracy of the final casting, and it is easy to perforate the thin-walled blade

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