Preparation method of closed spatial curved surface structure casting core

Abstract

The invention provides a preparation method of a closed spatial curved surface structure casting core. A spatial curved surface structure prepared from a water-soluble material is embedded into self-hardening sand; the spatial curved surface structure is dissolved with water after the self-hardening sand is solidified, so that a spatial curved surface structure inner cavity meeting the curved surface requirements can be obtained. Urea is optimized as the water-soluble material; compared with table salt as the water-soluble material, the advantages that the urea is high in solubility, low in melting point, and high in strength after being solidified are mainly utilized; furan resin sand is optimized as the self-hardening sand; and compared with urea-formaldehyde resin sand, the characteristics that the furan resin sand is better than the urea-formaldehyde resin sand in high temperature resistance in the baking process and does not scatter are mainly utilized.

Description

Technical field [0001] The invention relates to the technical field of the preparation process of casting cores, in particular to a method for preparing a casting core with a closed space curved surface structure. Background technique [0002] For castings with closed space curved surface structure, such as an open-close hydraulic impeller with a complex rotating surface, the space curved structure is a blade with a spatial torsion topological surface. The blade is located between the two interlayers of the impeller. Therefore, in the casting of open-close water When the impeller is mechanical, the core must be used. The shape of the cavity surface of the core determines the shape of the space surface of the casting. Therefore, how to prepare the core with the shape of the cavity surface to meet the requirements is the first problem to be solved in the casting of closed space surface structure castings. [0003] At present, the traditional process of preparing the casting core of ...

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Problems solved by technology

[0004] The present invention proposes a closed space curved surface in order to solve the problem that the cavity in the core is seriously deformed during the core preparation process of the closed space curved surface structure casting and does not meet the design requirements of the space curved surface of the closed space curved surface structure casting. The preparation method of the structural casting core is to embed the space surface structure prepared by the water-soluble material in the self-hardening sand, and dissolve the space surface structure with water after the self-setting sand is solidified, so that the formed core cavity surface is completely Meet the design requirements of space surface structure

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