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Quick measurement method for blade curved surface

A measurement method and blade technology, applied in the direction of measurement devices, instruments, etc., can solve the problems of difficulty in improving measurement accuracy, low measurement efficiency and reliability, and achieve the effect of ensuring dynamic performance

Inactive Publication Date: 2015-08-26
JILIN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a rapid measurement method of blade curved surface to solve the problems of difficulty in improving measurement accuracy, low measurement efficiency and reliability existing in the measurement process of traditional blade parts

Method used

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  • Quick measurement method for blade curved surface
  • Quick measurement method for blade curved surface
  • Quick measurement method for blade curved surface

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Experimental program
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Embodiment Construction

[0038] Include the following steps:

[0039] (1), in the direction perpendicular to the Z axis, intercept 3 section lines at equal intervals at the top, root and middle of the blade, and use a three-coordinate measuring machine to collect the measurement points of the section lines;

[0040] (2) Calculation of geometrically sensitive point positions: respectively perform 3 times of B-spline curve fitting on the measurement points of the above-mentioned cross-section lines, derivate the obtained 3 times of B-spline curves, and bring the first-order derivative and second-order derivative into the curvature Formula, calculate the curvature of the measurement point, calculate the average value of the curvature of the three B-spline curves, the intersection point of the average value and the curvature value is the geometrically sensitive point sought;

[0041] (3) Calculation of the maximum deflection area endpoints: Calculate the maximum deflection of the leaf back and leaf basin ...

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Abstract

The invention relates to a quick measurement method for a blade curved surface, belonging to the field of blade measurement. The method comprises the following steps: firstly determining endpoints of the maximum deflection region of section lines and geometric sensitive positions of front and back edges; planning a measurement curve of an axial direction of a blade; calculating measurement points of the axial curve by virtue of a curve approximation method so as to further determine the measurement section of the blade; partitioning the region according to the drastic characteristic of the curvature of the section line; quickly extracting the measurement points of the section line by virtue of double rules of the curvature and Hausdorff distance; and planning a measurement point set of each section line. The method has the advantages that the measurement of the blade curved surface is carried out by applying the method, so that the quantity of the measurement points is greatly reduced, and the measurement efficiency of the blade is remarkably improved on the premise of ensuring the precision of the profile of the blade.

Description

technical field [0001] The invention relates to the field of blade measurement, in particular to a measurement method used in blade processing. Background technique [0002] The development of aerospace technology has higher and higher requirements on the performance of the engine. As the key component of the aero-engine, the precision machining equipment and technology of the blade have become the frontier topic in the national manufacturing field. In order to obtain high-quality blades, multiple measurements and corrections are required during the manufacturing process. Blade measurement is an important means to analyze blade machining allowance and test the quality of finished products. However, due to the inherent contradiction between measurement efficiency and measurement accuracy, efficient and accurate measurement of blades has always been one of the difficulties in blade processing. With the increase of the complexity of the blade surface, the difficulty of realizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00G01B21/20G01B21/16
CPCG01B21/00G01B21/20
Inventor 杨旭刘佳赵继曲兴田王昕
Owner JILIN UNIV
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