A machining method of thin-wall integral centrifugal impeller with precision inner cavity of aerospace engine

Abstract

The invention provides a machining method for a precision inner cavity thin-wall integral centrifugal impeller of an aerospace engine. The machine method comprises the steps of material preparation, blank rough outline turning, semi-fine profile turning, blade type rough milling, natural failure, profile 1 fine milling, drilling, blade type fine milling, blade profile 2 fine milling, clamp repair,dynamic balance, fluorescence inspection and final inspection. According to the machining method for the precision inner cavity thin-wall integral centrifugal impeller of the aerospace engine, in particular to the machining of a centrifugal impeller of a high rotation speed engine used in an aerospace vehicle, an ultra-thin multi-curved surface blade with thickness of 1.2mm can be machined, the blade does not deform during the machining process, the residual height of a hub is ensured, the knife mark in the direction of air flow is machined; meanwhile, the extremely high coaxiality of inner holes in the two end surfaces of the hub and the micron accuracy of the machining of the inner holes in the large end surface of the hub can be ensured, and the requirements of very high dynamic balance, dimensional accuracy and shape and position tolerance of parts can be met.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing method for a centrifugal impeller with a thin-walled complex curved surface in a precision inner cavity of an aerospace vehicle engine. Background technique [0002] At present, there are many types and models of centrifugal impellers, the key parts of domestic aerospace engines. Because of their different shapes, precision and materials, their processing difficulties and process methods vary greatly. The curved surface impeller for aerospace vehicle engine includes main blade and splitter blade. It is a thin blade made of forged aluminum. Its working characteristic is high-speed rotation. Micron level, its inner cavity is complex in shape and extremely difficult to process. At present, there is no method in China to process this part. Therefore, a machining method for aerospace engine precision inner cavity thin-walled integral centrifugal ...

AI Technical Summary

Problems solved by technology

The curved surface impeller for aerospace vehicle engine includes main blade and splitter blade. It is a thin blade made of forged aluminum. Its working characteristic is high-speed rotation. Micron level, the shape of the inner cavity is complex, and the processing is extremely difficult. At present, there is no method in China to process this part. Therefore, a processing method for the precision inner cavity and thin-walled integral centrifugal impeller of aerospace engines is proposed to fill the gap in domestic technology.

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