Blade three-dimensional contour high-precision detection method based on blade root self-reference surface

Abstract

The invention discloses a blade three-dimensional contour high-precision detection method based on a blade root self-reference surface. The method comprises the following steps: 1, calibrating the pose of a line laser sensor; 2, calibration of a rotation axis: obtaining a rotation center by using the characteristic of high precision of an auto-collimation surface of the blade to realize calibration of the rotation axis; 3, detecting the profile of the section of the to-be-detected blade. A plurality of rotation center points are obtained by using a reference surface with high flatness precision, the calibration of the rotation axis is realized by using the characteristics of big data and the least square method, the calibration precision is improved, and the detection precision of the blade is further improved.

Description

technical field [0001] The invention belongs to the field of blade contour detection, and in particular relates to a high-precision detection method for a blade three-dimensional contour based on a self-reference plane of a blade root. Background technique [0002] As a key component in aero-engines, gas turbines, steam turbines and other equipment, blades undertake the important task of converting heat energy into mechanical energy. The shape and quality of blades directly affect the energy conversion efficiency and service life of the whole machine. Due to the irregular curved surface of the blade and the different profile of each section height, the blade detection work is more difficult. [0003] The Chinese invention patent with the patent number of 2020111289896 discloses a detection method using the high-precision characteristics of the reference plane of the blade and the same distance from the center of rotation to the same reference plane to solve the center of rot...

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Problems solved by technology

[0003] The Chinese invention patent with the patent number of 2020111289896 discloses a detection method using the high-precision characteristics of the reference plane of the blade and the same distance from the center of rotation to the same reference plane to solve the center of rotation, and through two The center of rotation calculates the deflection angle of the rotating table to realize the calibration of the rotating table and the axis of rotation. Although this method has further improved the detection accuracy of the blade, only two center points of rotation are used to realize the calibration of the table and the axis of rotation. Calibration, there is still an error, according to the step (26) in the patent application document, move the line laser sensor along the Z axis of the moving coordinate system, so that the laser surface of the line laser sensor coincides with the horizontal reference plane of the blade and the side reference plane coincides, repeat the steps (21)~(24) Obtain the rotation center point O 3 and O 4 , center of rotation O 3 and O 4 The coordinate data x and y are equal to realize the inspection of the blade rotation axis, but in the actual measurement process, it is found that the measurement rotation center point O 3 and O 4 The coordinate data x and y are difficult to be equal, and there is a certain error, which cannot be ignored in the subsequent leaf splicing process and detection

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