Method for forming thin-walled volute shell with spiral structure on basis of counter-gravity casting

Abstract

The invention discloses a method for forming a thin-walled volute shell with a spiral structure on the basis of counter-gravity casting. Resin sand modeling and counter-gravity forming manufacturing processes are adopted, the thin-wall filling capacity and filling speed are improved, and the feeding force in the solidification stage is enhanced. Meanwhile, according to characteristics of a productstructure, the position and size of a casting system are reasonably selected, digital simulation software is applied, rapid verification of a casting scheme is realized, and the problem that a traditional casting process cannot easily achieve defect-free casting formation is solved. The method is mainly used for manufacturing small thin-wall complex structure aluminum alloy shell castings, the development cycle is greatly shortened, the cost is reduced, the manufacturing efficiency and size precision of volute structure aluminum alloy shells are effectively improved, the problem that traditional gravity casting is poor in filling capacity and feeding capability is solved, the forming limit of the thin-wall structure castings is expanded, technical support is provided for advanced design structure application, and a solid foundation is laid for batch production of products.

Description

technical field [0001] The invention relates to a method for forming a thin-walled volute casing with a spiral structure based on anti-gravity casting, and belongs to the technical field of sand casting. Background technique [0002] The spiral diffusion structure is a common structure for the gas outlet of components such as the pre-pressure pump, oxidizer pump, and fuel pump of pump-pressed liquid rocket engines, and the design parameters are controlled by the spiral angle and size. Based on weight reduction considerations, the structure is designed to be thin-walled and uniform in thickness, and the space is distorted and complex. The material is often selected from lightweight alloys such as aluminum alloys and magnesium alloys. As a gas outlet, it needs to withstand high temperature and high pressure impact. It has high requirements on the quality of castings, generally Class I castings, and casting defects such as cracks, cold shuts, trachomas, shrinkage cavities, shri...

AI Technical Summary

Problems solved by technology

However, as the pouring temperature decreases, the filling speed of molten metal decreases, so it is not suitable for forming thin-walled structures

The traditional casting process is difficult to achieve flawless castings, so this type of aluminum alloy castings with thin-walled complex volute structures has become a major problem in the field of liquid rocket engine casting

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