Blade three-dimensional molded surface contour high-precision matching method based on self-reference surface

Abstract

The invention discloses a blade three-dimensional molded surface contour high-precision matching method based on a self-reference surface. The method comprises the following steps: (1) calibrating the pose of a line laser sensor and calibrating a rotary table surface before a blade is mounted; (2) calibration of a rotation axis: calibrating the rotation axis by adopting the characteristics of a side reference surface A and a reference surface B which intersect with each other of the blade; and (3) reconstructing the three-dimensional profile of the blade, establishing a blade data coordinate system according to the rotation axis and the reference surface C, integrating the acquired multi-view-field blade profile data into the blade data coordinate system, and further completing reconstruction and detection of the three-dimensional profile of the blade through curve and curved surface fitting. According to the method, the rotation axis is calibrated by using the two intersecting side reference surfaces of the blade, the method is suitable for all blades, the universality and efficiency of the detection method are improved, the length of an error transfer chain is reduced compared with a traditional method, and the contour reconstruction precision is improved.

Description

technical field [0001] The invention belongs to the field of blade detection, and in particular relates to a high-precision matching method of a three-dimensional profile of a blade based on a self-reference plane. 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] Chinese invention patent 2020111309847 discloses a 3D profile reconstruction method based on the self-features of the blade. This method uses the characteristic that the two side reference planes of the blade are connected to calibrate the center of the turntable. Although this method does not intro...

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Problems solved by technology

[0003] Chinese invention patent 2020111309847 discloses a 3D profile reconstruction method based on the self-features of the blade. This method uses the characteristic that the two side reference planes of the blade are connected to calibrate the center of the turntable. Although this method does not introduce an external calibration block to realize the alignment of the turntable Calibration of the center, but only a center of the turntable is calibrated, and then the vertical line passing through the center of the turntable is used as the z-axis, which leads to the fact that the actual rotation axis is not parallel to the blade axis, which leads to errors in the later splicing data

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