A Method for Positioning and Attitude Adjustment of Aviation Blades Based on Bilateral Ultrasonic Rolling

Abstract

The invention provides a method for positioning and attitude adjustment of aviation blades based on double-sided ultrasonic rolling processing, which includes the steps: S1 uses the ultrasonic rolling head as a probe to measure the double-sided surfaces of the blades, and obtains the coordinates of the blades relative to the machine tool in the initial installation state A set of point sets of the system constitutes the point cloud to be registered. S2 uses the initial registration algorithm of the sampling consistent point cloud and the iterative closest point accurate registration algorithm considering the curvature feature, and combines the point cloud of the blade to be registered with the target obtained according to the theoretical model. Point clouds are registered to obtain the rotation transformation matrix and translation transformation matrix of two sets of point clouds; S3 transforms the two sets of transformation matrices into blade rotation and translation attitude adjustments; S4 according to the attitude adjustment obtained above, according to the first rotation amount Sequentially adjust and then adjust the translation amount sequentially to adjust the step-by-step attitude, so as to realize the precise positioning of the blade. The invention integrates blade measurement, attitude adjustment and ultrasonic rolling strengthening processing to improve the accuracy of the surface strengthening processing of the aeroengine blade.

Description

technical field [0001] The invention relates to an aeroengine blade, in particular to a positioning and attitude adjustment method for an aero blade based on double-side ultrasonic rolling processing. Background technique [0002] Aeroengine blades are typical thin-walled components with complex curved surfaces. Because the blades are exposed to high-temperature, high-pressure, and high-speed working environments for a long time, they are prone to various damages. The surface strengthening process of the blades can improve the fatigue life of the blades. Among them, the surface ultrasonic rolling strengthening technology It is an effective surface strengthening method. However, before performing ultrasonic rolling strengthening on aero-engine blades, the precise positioning of the blades is very important, and the positioning accuracy directly affects the effect of strengthening processing. Generally, the purpose of positioning is achieved by fixing the tenon of the blade. ...

AI Technical Summary

Problems solved by technology

Therefore, for aeroengine blades with free-form surfaces, it is obvious that this traditional positioning method cannot be directly applied.

In recent years, the positioning of complex curved surfaces can be roughly divided into two types: one is to use the curved surface as the positioning reference, combined with the principle of six-point positioning, to manually establish a measurement coordinate system, and through the coordinate system of the measurement coordinate system and the theoretical model. Transformation realizes the positioning of parts. This positioning method is often used in three-coordinate measuring machines to detect workpieces, but this method is greatly affected by human factors; the other is a positioning method based on iterative closest point algorithm or its improved algorithm. The measurement points on the complex surface are registered with the corresponding points of the theoretical model to solve the transformation parameters. Although this method can improve the positioning accuracy, for blades with free-form thin-walled features, since the blade body has no reference feature points, the measurement The selection of points and the method of blade attitude adjustment will directly affect the positioning accuracy and efficiency

Images