A pressure-regulating precision casting method for superalloy floating wall tiles under the action of an external electromagnetic field

Abstract

The invention provides a high-temperature alloy floating wall tile pressure-regulating precision casting method with the action of an external electromagnetic field, comprising: using 3D printing technology to print a wax mold of the gating system; atomizing and polishing the wax mold to remove the surface of the wax mold layer pattern; prepare a multi-layer shell on the wax mold; then demould the shell; use vacuum anti-gravity pressure regulation to pour the superalloy melt into the shell of the shell to form a casting. The variable electromagnetic field makes the electromagnetic body force in the process of filling and solidification stir the superalloy melt, and produces forced convection to change the temperature field and concentration field of the superalloy melt and refine the grains. The invention cooperates with the pressure regulating casting device to apply an alternating electromagnetic field during the filling and solidification process of the casting, realizes the effect of electromagnetic stirring and forced convection, improves the metallurgical quality of the casting, reduces internal defects, and increases the density.

Description

technical field [0001] The invention relates to the field of precision casting methods, in particular to a pressure-regulating precision casting method for superalloy floating wall tiles under the action of an external electromagnetic field. Background technique [0002] With the vigorous development of my country's aviation industry, the design of aviation castings has tended to be "high quality", "lightweight", "precision", "thin-walled" and "complex". The pressure regulating casting process is a new type of anti-gravity precision forming method, which combines the advantages of vacuum suction casting, low pressure casting and differential pressure casting technology, and is a common method for producing high-quality complex thin-walled castings. [0003] The thrust-to-weight ratio is the most important performance index of an aero-engine, and increasing the working temperature of the floating wall of the engine combustion chamber is an important measure to increase the th...

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents have the following deficiencies. Due to the increase of the mold shell temperature, the mold shell wall is less resistant to the erosion and flow of high-temperature molten metal, and impurities are easily introduced into the liquid metal, and the mold shell wall is supercooled to the liquid metal crystal grains. The effect is weakened, thereby reducing the effect of grain refinement

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