Three-dimensional inspection system and method for geometric parameters of air film holes in aeroengine blades based on zoom microscopy technology

Abstract

The invention discloses a system and method for three-dimensional detection of geometric parameters of gas film holes of aeroengine blades based on zoom microscopy technology. The detection system includes a CCD camera, a lens barrel, a computer, an XYZ three-dimensional electric translation stage, an object stage and a blade fixture; During the detection, adjust the position of the air film hole of the blade to be measured to the imaging area of ​​the CCD camera, obtain the image sequence of the air film hole of the aeroengine blade, and use the focus evaluation function to calculate the focus function evaluation function value of each pixel in the image sequence, and obtain The final three-dimensional data of the air film hole of the blade is calculated by calculating the three-dimensional data of the inner surface of the hole to obtain the roughness S of the inner surface of the hole a , a variety of geometric parameters can be obtained in one measurement, with high efficiency, high measurement repeatability and low uncertainty.

Description

technical field [0001] The invention belongs to the field of aviation industry, and relates to an aero-engine blade detection technology, in particular to a three-dimensional detection system and method for the geometric parameters of air-film holes of aero-engine blades based on zoom microscopy technology. Background technique [0002] With the continuous development of the aviation industry, the new generation of aero-engines improves the reliability and maneuverability of the aircraft by increasing the gas temperature before the turbine, making it more thrust, higher thrust-to-weight ratio, and lower fuel consumption. The air film hole is a necessary structure to improve the temperature bearing capacity of the blade and make the blade serve reliably. According to its cooling principle, the geometric parameters of the air film hole directly affect the mechanical properties and cooling effect of the blade. Therefore, in order to ensure that the air film holes meet the desi...

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Problems solved by technology

[0003] At present, the methods for measuring the geometric parameters of air film holes in aero-engine blades are mainly contact or non-contact detection technologies. Among them, contact measurement needs to make micro-probes to extend into the holes for detection, but this method has the disadvantages of slow measurement speed, The efficiency is not high and it is impossible to obtain multiple parameters at the same time.

Non-contact measurement is mainly based on various optical measurement methods, such as the measurement method of light interference spectrum analysis technology, which can obtain good repeatability, but it still cannot meet the detection requirements of batch air film holes due to low efficiency

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