High-temperature alloy floating wall tile pressure-regulating precision casting method under action of external electromagnetic field

Abstract

The invention provides a high-temperature alloy floating wall tile pressure-regulating precision casting method under the action of an external electromagnetic field. The method comprises the following steps that printing is carried out by adopting a 3D printing technology to obtain a wax mould of a pouring system; the wax mold is atomized, polished and ground, and surface texture of the wax moldis removed; a multilayer shell is prepared on the wax mold; the shell is demolded; high-temperature alloy melt is poured into the shell by adopting vacuum counter-gravity pressure regulation to form acasting, an alternating electromagnetic field is added in the casting process of the casting, the electromagnetic volume force in the filling and solidification processes plays a stirring role on thehigh-temperature alloy melt, forced convection is generated to change the temperature field and the concentration field of the high-temperature alloy melt, and grains are refined. The high-temperature alloy floating wall tile pressure-regulating precision casting method is matched with a pressure regulating casting device, the alternating electromagnetic field is applied in the process of castingfilling and solidification, the effect of electromagnetic stirring forced convection is realized, the metallurgical quality of castings is improved, internal defects are reduced, and the density is improved.

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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