A kind of closed impeller wax mold manufacturing method

Abstract

The invention discloses a closed impeller wax mold manufacturing method. The closed impeller wax mold manufacturing method is used for preparing a closed impeller wax mold for precise casting, and comprises the following steps: (A) the closed impeller wax mold is divided into three parts for respective manufacturing; and the three parts include a gate wax mold, an internal wax mold and a cover wax mold; (B) the internal wax mold is provided with a channel mold shell for filling an opening runner; and (C) the gate wax mold and the cover wax mold in the step (A) are bonded with the internal wax mold, so that a cover is fixedly connected with the opening runner, and full filling of the channel mold shell in the step (B) in a closed cavity formed by the cover and the opening runner is guaranteed to finish the manufacturing of the closed impeller wax mold. The closed impeller wax mold manufacturing method, provided by the invention, can manufacture the mold shell corresponding to a closed airflow channel firstly, so that the quality of the mold shell for forming the closed airflow channel can be guaranteed.

Description

Technical field [0001] The invention relates to the technical field of precision casting, in particular to a method for manufacturing a closed impeller for an engine, and in particular to a method for manufacturing a closed impeller wax mold. Background technique [0002] Closed impellers, that is, impellers with closed airflow channels with complex shapes, are used in radial turbines of gas turbine engines, centrifugal compressors, and piston engines because of their characteristics of reducing air loss at the tip of the impeller and improving efficiency. Intake superchargers, centrifugal compressors are more and more widely used. The working speed of the closed impeller is extremely high (20000r / min-40000r / min, or even higher), and it needs to bear the strong centrifugal load and other mechanical forces and complex aerodynamic forces to achieve the expansion of gas or compress the air To the design pressure, it is usually manufactured by precision casting, and the casting qual...

AI Technical Summary

Problems solved by technology

When coating and loose sand on the surface of the integral wax model 3, due to the existence of closed, elongated and twisted irregular cavities 310 (with the shape and shape of the aforementioned closed passage 21) in the wax model main body 31 consistent size), it is difficult to paint and sand these cavities 310, so the paint and sand on the inner surfaces of these cavities 310 are of poor quality, which in turn will cause poor surface quality of the molded shells, and thus have defects in strength.

In the end, it will lead to a large deviation of the air flow channel surface size of the cast blank, poor surface quality, and frequent defects such as pitting, swelling, and pits

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