Investment casting method capable of controlling wall thickness of aero-engine hollow blade

Abstract

The invention discloses an investment casting method capable of controlling the wall thickness of an aero-engine hollow blade. In the provided method, a chaplet mould is used, and then a wax material that is used to prepare a hollow blade wax mould, is adopted to prepare a chaplet. Thus the crevice between the chaplet and the wax mould can be effectively avoided. Moreover, the repairing of the wax mould and the casting becomes easier. The free end and the fixed end can be controlled so as to effectively control the wall thickness of a hollow blade. Furthermore, reasonable casting technological parameters are adopted and the casting speed is controlled so as to avoid the phenomenon of deviation, leakage, and core breaking during the hollow blade casting process. The provided casting method can produce aero-engine hollow blades with a complicated internal structure, and the disqualified rate due to deviation, leakage, and core breaking is controlled below 5%.

Description

technical field [0001] The invention relates to precision casting, in particular to an investment casting method for controlling the wall thickness of the hollow blade of an aeroengine. Background technique [0002] With the development of aero-engine blade manufacturing technology, there are more and more hollow blades, and the inner cavity structure of blades is becoming more and more complex. Among them, the wall thickness of the blade is an important characteristic of the hollow blade. Controlling the wall thickness of the hollow blade becomes an investment casting hollow blade. It is the key technology of concatenated hollow blades. [0003] The traditional method of controlling the wall thickness of the hollow blade is to control the blade wall thickness by installing a plastic core support in the wax model when making the wax model. The disadvantages of this blade wall thickness control method are: plastic and wax materials are difficult to combine, forming gaps, whi...

AI Technical Summary

Problems solved by technology

The disadvantages of this blade wall thickness control method are: plastic and wax materials are difficult to combine, forming gaps, which are not easy to handle; plastic core braces are easy to form protrusions on the surface of the wax model, which is difficult to eliminate, and they need to be removed by grinding when they are retained on the metal parts , it is easy to damage the surface and size of the casting; the plastic core support is not firmly combined with the core, and sometimes it is easy to fall off

As a result, the scrap rate of blade castings is as high as 50%.

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