Casting ceramic filter based on 3D printing and preparation method thereof

Abstract

The invention discloses a casting ceramic filter based on 3D printing and an efficient and low-cost preparation method thereof.The preparation method is used for preparing a high-end casting ceramic filter based on continuous surface exposure 3D printing and comprises the following steps of ceramic filter structure design, composite slurry preparation, ceramic filter printing and printing post-treatment. The strength of the filter screen is improved, the defects of corner falling, edge missing, pits, cracks and the like of the filter screen are eliminated, the filtering effect is greatly enhanced, and then the precision casting quality is improved; the roughness of the inner and outer surfaces of the filter screen is reduced, the surface quality and forming precision are improved, the filtering flow speed is increased, and the filtering efficiency is improved.

Description

technical field [0001] The application belongs to the technical field of casting, and in particular relates to a ceramic filter for casting based on 3D printing and a preparation method thereof. Background technique [0002] As the core component of the filter system, the ceramic filter is widely used in the casting of various high-precision components in many fields such as marine turbines, aerospace, high-speed trains, petrochemicals, and construction machinery. The ceramic filter screen can effectively remove or reduce the inclusions in the molten metal, improve the purity of the molten metal, make the surface of the cast metal casting smooth, uniform in structure, increase in strength, reduce the scrap rate, and further reduce the machine. Processing loss increases labor productivity. [0003] Existing ceramic filter screens for casting mainly include straight hole type, foam type and the like. Among them, the foam ceramic filter screen is a special ceramic product wit...

AI Technical Summary

Problems solved by technology

[0004] Yet existing ceramic foam filter screen still has the following problems: (1) traditional filter screen is a kind of porous ceramic foam filter screen that filters metal liquid when casting metal liquid, comprises silicon carbide refractory material as the main, matching The mixed slurry made of corundum powder and clay is adhered to the polyurethane foam carrier, and after sintering, it forms a three-dimensional network structure with multi-layered holes, and the adjacent holes are connected with each other and meandered.

In actual use, when the strength of the filter screen is low, the flow rate of the metal liquid is fast, the impact force is large, or the high temperature resistance of the filter screen is poor, the filter screen is easily broken, and the damaged filter screen fragments fall into the inside of the metal liquid. In turn affecting the quality of metal castings

(2) The existence of filter screen defects such as drop corners, missing edges, pits, cracks, etc. of the filter screen itself will undoubtedly lead to problems such as insufficient filtration of the metal solution, thus affecting the quality of precision casting

[0005] The invention patent [202110675634.7] involves a porous ceramic filter with controllable pore gradient and its preparation method, and the invention patent [202010957990.3] involves a light-cured 3D printed zirconia foam ceramic filter and its preparation method; but These two patents only proposed the concept of 3D printing, and did not limit the specific size of the gap

The patent [202011131280.1] has requirements for wall thickness and pore diameter, but because it adopts photocuring molding of conventional slurry, its printing speed is affected by the viscosity of ceramic slurry, and the printing speed can generally only reach 20-30mm / h, and high Equipment for high-resolution 3D printing is very expensive

Images