Blade section line adaptive reconstruction method based on on-machine measurement

Abstract

The invention discloses a blade section line self-adaptive reconstruction method based on on-machine measurement, and solves the problem that abnormal points occur in on-machine measurement of section lines due to position differences of blades of a blisk in linear friction welding, and the problems that curve fitting is not smooth, a reconstructed blade model is distorted, the model processing efficiency is low and the like due to the abnormal points. According to the method, the blade profile section line data is collected in an on-machine measurement mode and automatically registered, the actual section line of the blade is self-adaptively reconstructed, and the error between the actual section line and the actual blade is guaranteed. Through an on-machine measurement technology and automatic registration, a blade alignment step in self-adaptive processing is avoided, and the processing efficiency is improved. Through the steps of feature point error extraction and error fairing, the consistency of the reconstructed section line and the actual blade is ensured. The method has the advantages of being high in universality and practicability, and capable of creating huge economic benefits while improving the core innovation ability and research and development efficiency for enterprises.

Description

technical field [0001] The invention belongs to the technical field of aerospace numerical control machining, and is especially suitable for improving the efficiency and accuracy of on-line measurement and model reconstruction of aeroengine integral blisk parts. Background technique [0002] During the adaptive machining of the linear friction welding integral blisk, the machined surface of the blade welding section and the completed actual blade surface are required to be smoothly connected. Therefore, it is necessary to construct an adaptive blade based on the completed blade data, and compile a processing program for the welding section to ensure a smooth transition of the blade shape. Adaptive blades are generally created by setting out several sets of section lines. The reconstruction accuracy of the blade section lines directly affects the degree of fit between the adaptive blade and the actual blade shape, thus determining the quality of adaptive processing. In recent...

AI Technical Summary

Problems solved by technology

[0003] For the reconstruction method of linear friction welding overall blisk blade section line, the current main technical method is to obtain the actual blade point cloud by offline scanning, intersect and project the point cloud and section, obtain the section points and interpolate them into section lines, and pass three The coordinate measuring machine directly measures the cross-section line points, and then interpolates to obtain the cross-section line. So far, there is no public self-adaptive reconstruction method for blade cross-section lines based on on-machine measurement.

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