Three dimensional measurement method of irregular curved surface

Abstract

The present invention relates to a three dimensional measurement method of an irregular curved surface. The measurement method comprises the steps of firstly planning a measurement track of a measurement needle sphere center according to an appointed cross-section position required by a drawing on a parts MBD model, generating a measurement path, then compensating the measurement data according tothe model vectors, enabling the compensated data points at an appointed cross-section height, and finally connecting the cross-section points into a curve to evaluate the blade parameters; measuringaccording to the track of the measurement needle sphere center, and then compensating the radius of a measuring head according to the model vectors, and calculating the radius compensation according to the model vectors, wherein the vectors of each measurement point on a three dimensional curved surface are different, so that the compensation directions are different; connecting the compensated cross-section actual measurement points into a blade type curve to evaluate the blade parameters. The advantages of the present invention are that a three dimensional model measurement technology of theirregular curved surface is realized, at the same time, by adopting a model-based measurement mode, the digital design, manufacturing and detection integrated flow of an engine is promoted, and a keydetection technology and the detection efficiency are also improved.

Description

technical field [0001] The invention relates to a contact three-dimensional measurement method, in particular to a three-dimensional measurement method for irregular curved surfaces. Background technique [0002] The geometric shape of the aeroengine blade has irregular surface features, and the surface of the blade has an irregular surface composed of the spanwise inclination and the blade chord inclination figure 1 , according to the design and measurement requirements, the three-coordinate probe scans along the chord direction of the blade, so the chord direction inclination angle has relatively little influence on the measurement results. Since the inclination angle of the span direction of traditional blades generally does not exceed 10°, higher measurement accuracy can be obtained when two-dimensional scanning is used for measurement. However, with the continuous improvement of the performance of aero-engines, the geometric torsion of the blades has increased, and the...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of contact measurement compensation when measuring irregular curved surfaces. The theoretical vector of the model is used to compensate the measured point, and the measurement path is obtained by calculating the vector direction to ensure that the compensated measurement point is at the designated cross-section position in the design. , and eliminate the compensation error of the stylus, it provides a three-dimensional measurement method for irregular surfaces

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