Investment casting process for complex thin-wall hollow aluminum alloy aviation part

Abstract

The invention belongs to the technical field of investment casting processes, and relates to an investment casting process of a complex thin-wall hollow aluminum alloy aviation part. The investment casting process comprises the following steps that a water-soluble ceramic core is manufactured by adopting a 3D printing mode, the water-soluble ceramic core is coated with an organic waterproof coating, and drying is carried out on the water-soluble ceramic core; a wax injection mold is manufactured according to the shape of a casting, a water-soluble ceramic core is placed in the wax injection mold, a wax material is injected into the wax injection mold after mold closing to form a wax mold, the wax mold is coated with gypsum slurry, and after the gypsum slurry is hardened, heating dewaxing and roasting are carried out to obtain a gypsum casting mold; and molten metal is poured into the gypsum casting mold by adopting a vacuum pouring and pressurizing solidification method to obtain a casting mold, and finally the casting mold is put into clear water to dissolve and remove the water-soluble ceramic core to obtain the needed complex thin-wall hollow aluminum alloy aviation part. According to the investment casting process of the complex thin-wall hollow aluminum alloy aviation part, the water-soluble ceramic core and the gypsum casting mold are combined, so that the problem that along and narrow inner cavity of the gypsum casting mold sinks is solved, and forming of looseness, cold shut and hot cracks in the casting is reduced through vacuum pouring and pressurizing solidification.

Description

technical field [0001] The invention belongs to the technical field of investment casting technology, and in particular relates to the investment casting technology of complex thin-walled hollow aluminum alloy aviation parts. Background technique [0002] With the development of the national defense industry, many large, complex, thin-walled hollow aluminum alloy castings have appeared in the field of aluminum alloy casting. The damper frame structure of the air intake system of the aircraft auxiliary power unit is a complex thin-walled hollow aluminum alloy. Aviation parts, the existing complex thin-walled hollow aluminum alloy aviation parts manufacturing process is not standardized, in the process of making the damper frame structure of the air intake system of the aircraft auxiliary power unit using the existing technology, the narrow and long inner cavity of the plaster model is easy to sink, and the melting Therefore, it is urgent to improve the investment casting proc...

AI Technical Summary

Problems solved by technology

[0002] With the development of the national defense industry, many large, complex, thin-walled hollow aluminum alloy castings have appeared in the field of aluminum alloy casting. The damper frame structure of the air intake system of the aircraft auxiliary power unit is a complex thin-walled hollow aluminum alloy. Aviation parts, the existing complex thin-walled hollow aluminum alloy aviation parts manufacturing process is not standardized, in the process of making the damper frame structure of the air intake system of the aircraft auxiliary power unit using the existing technology, the narrow and long inner cavity of the plaster model is easy to sink, and the melting Therefore, it is urgent to improve the investment casting process of complex thin-walled hollow aluminum alloy aerospace parts.