Method for manufacturing major diameter enclosed impeller

Abstract

The invention relates to a method for manufacturing a major diameter enclosed impeller, and belongs to the technical field of aerospace equipment manufacture. The method comprises the following steps: rough machining a cap of an impeller; rough machining the impeller; assembling to form an impeller assembly craft piece; clamping and brazing; rough machining an excircle and a stepped surface on the impeller side; rough machining the cap of the impeller; fine machining an outline profile and an inner bore on the impeller side; fine machining an outer arc surface of the cap of the impeller; performing dynamic balance correction, and the like. The method has the benefits as follows: a practical efficient machining scheme is provided for machining a major diameter enclosed brazed impeller with balance precision of G0.2; the machined blower impeller is high in balance precision; the problem about potential hazard existing in use of the product due to excessive metal margin removal during high-precision dynamic balancing process can be solved; the service life and the working reliability of the product are improved.

Description

technical field [0001] The invention relates to a method for manufacturing a large-diameter closed impeller, which belongs to the technical field of aerospace equipment manufacturing. Background technique [0002] At present, the large-diameter closed impeller, as the core component of the fan, has been widely used in aerospace and other technical fields. Generally, the impeller of the fan is in a rotating state during work, and the general speed is above several thousand revolutions per minute, even as high as tens of thousands of revolutions per minute. The balance of the impeller can ensure that the fan has high efficiency and low noise. When it is unbalanced, the noise of the fan will be loud and the service life will be short, and the whole machine will vibrate violently, causing early damage. [0003] Therefore, all fan impellers must be corrected for dynamic balance regardless of the material. Dynamic balance has nothing to do with the material of the rotating body, ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the structure and working performance of the closed impeller are affected by the thin wall thickness of the closed impeller due to the excessive metal removal during the balance correction process when the impeller with a balance precision grade of G0. There are hidden dangers and accidents in normal work, and a method for manufacturing large-diameter closed impellers is provided, especially a method for manufacturing large-diameter closed impellers with a balance accuracy level of G0.2

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