Investment casting mold cavity cleaning method based on selected area laser powder sintering rapid proto-typing technology application

Abstract

Disclosed is an investment casting mold cavity cleaning method based on selected area laser powder sintering rapid proto-typing technology application. According to the technical scheme, the top end of a wax mold and the secondary top end of the wax mold are connected with a residue discharging channel and a residue collecting device in a welded mode in a mold set assembling process. After a shell manufacturing process and a dewaxing process, flowing discharging of a wax mold in a liquid state and gathering of remained residues can be effectively controlled in a baking process, so that a clean mold cavity is obtained. After a series of well-known investment casting technology such as smelting, pouring, sand cleaning and piece dropping, an investment casting with a surface and an interior being good in quality is obtained.

Description

Technical field [0001] The invention relates to the application of selective laser powder sintering rapid prototyping technology in investment casting, which provides a cavity cleaning method for improving the internal and surface quality of investment castings. Background technique [0002] Selective laser powder sintering rapid prototyping technology (hereinafter referred to as SLS technology) is one of the rapid prototyping technology methods, and it is also one of the early rapid prototyping technology methods applied in the field of investment casting. [0003] The sintering material used in SLS technology is polymer composite powder, and the prototype fired by the molding machine is post-processed to become a wax model (or part, the same below), but this wax model is different from the traditional investment casting. The wax materials used are different, showing a high melting point (about 180°C), which cannot be melted (or vaporized) in the dewaxing process, and must ...

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Problems solved by technology

[0005] The module anatomy experiment shows that even if the cavity is cleaned and the second roasting is carried out, the residual residue is still difficult to be completely ablated. According to the statistics of the incomplete weighing test, the residual residue content reaches 0.25-0.5% (mass fraction), pouring When filling the mold, molten steel (or molten metal) will wash away these remaining residues and cause them to be involved in the molten metal, resulting in casting defects such as pores, inclusions, and incomplete local shapes.

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