Precoated sand casting method for submerged pump impeller

Abstract

The invention discloses a precoated sand casting method for a submerged pump impeller. A precoated sand shell mould is used for replacing a wet sand mould. The traditional core box method is changed into a hot box precoated sand parting core manufacturing method. The scheme is realized by combining two moulds into a precoated sand model with impeller core petals. The precoated sand model with impeller core petals comprises a core petal mould head (1) and a core petal mould tail (2), wherein the upper surface of the core petal mould head (1) is fan-shaped; a petal tail mould heave (3) is arranged on the outer side of the core petal mould tail (2); a plurality of precoated sand models with impeller core petals are combined into an impeller core precoated sand model; the petal tail mould heave (3) causes the impeller core precoated sand model to have a core petal mould clearance (4); and after the core petal mould clearance (4) is poured, an impeller blade (5) of the submerged pump impeller is formed. According to the precoated sand casting method provided by the invention, the gloss finish and casting precision of the impeller blade are increased; the problem of long time consumption of the traditional core manufacturing is solved; and the core manufacturing is simple and the processing is easier.

Description

Technical field [0001] The invention relates to a casting method, in particular to a coating sand casting method of a submersible pump impeller. Background technique [0002] The prior art submersible pump impeller is cast by sand casting, and the core is a resin sand core or an oil core. The smoothness and casting accuracy of the outer surface of the impeller blade using sand casting are difficult to control. Summary of the invention [0003] In order to solve the above existing problems, the present invention discloses a coating sand casting method for submersible pump impellers, replacing the green sand molding with a coated sand shell type, and changing the traditional core box method to hot core box coated sand The split core method is realized as follows: [0004] Two-part molds are combined to obtain a coated sand model of the impeller core valve. The impeller core valve coated sand model includes a core valve die head and a core valve tail. The upper surface of the core val...

AI Technical Summary

Problems solved by technology

[0006] Beneficial effects: the invention improves the smoothness of the impeller blades and the casting precision of the blades, reduces the weight of castings, and improves the utilization rate of molten iron; solves the problem of long time-consuming traditional core making; simple core making and easier processing; saves the cost of castings land area

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