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Aviation engine blade profile three-coordinate measuring method

A three-coordinate measurement, aero-engine technology, applied in measurement devices, instruments, etc., can solve problems such as low accuracy, and achieve the effect of ensuring measurement accuracy and reducing measurement workload.

Inactive Publication Date: 2013-11-27
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to overcome the deficiency of low accuracy of the existing three-coordinate measurement method of blade profile, the present invention provides a three-coordinate measurement method of aero-engine blade surface

Method used

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  • Aviation engine blade profile three-coordinate measuring method
  • Aviation engine blade profile three-coordinate measuring method
  • Aviation engine blade profile three-coordinate measuring method

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Experimental program
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Embodiment Construction

[0029] refer to Figure 1-8 . The present invention is described in detail by taking the experimental blade of a certain type of aero-engine compressor as an example.

[0030] Step 1: Import the CAD model of the blade into the UG software, and extract the intersection line between the plane where the blade design data is located and the CAD model of the blade along the main axis of the blade, the result is as follows image 3 shown.

[0031] Step 2: Taking the leaf shape curve at Z=80 as an example, extract the middle arc of the leaf pot and leaf back curve according to the design data; let M be any point on the leaf back curve, and pass M to make the leaf back curve normal and the leaf pot curve intersect Point N; take MN as the diameter, and the midpoint O of MN as the initial center of the circle, calculate the closest point P from point O to the leaf pot curve, compare the distance between OP and the radius R of the initial circle, if the difference is less than ε (ε is ...

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Abstract

The invention discloses an aviation engine blade profile three-coordinate measuring method which is used for solving the technical problem that an existing blade profile three-coordinate measuring method is low in accuracy. According to the technical scheme, the aviation engine blade profile three-coordinate measuring method comprises the steps of based on extraction of a plurality of curves which can represent the blade profile main-axis direction curvature distribution characteristics, calculating curve control point sets to determine the blade measurement cross sections, based on curvature distribution and tolerance control, planning the minimum control point set of each measurement cross section, and achieving the three-coordinate measurement path planning of the blade profile. According to the aviation engine blade profile three-coordinate measuring method, the blade measurement cross sections are planned according to the blade profile curvature distribution characteristics, the measurement point set of each measurement cross section is planned based on the curvature and the tolerance control, the measurement workloads are reduced, and the measurement accuracy is ensured. The problem that the workloads are greatly increased due to the facts that in the traditional measurement work, the measurement cross sections are planned according to experience and the measurement accuracy is ensured by encrypting the measurement cross sections and the measurement points is solved.

Description

technical field [0001] The invention relates to a three-coordinate measurement method for a blade profile, in particular to a three-coordinate measurement method for an aero-engine blade profile. Background technique [0002] In the field of aero-engines, blades are the core components of turbomachinery. The complex and curved shapes of blade parts have an important impact on the aerodynamic performance of aero-engines; to ensure that the overall aerodynamic performance of aero-engines meets the design requirements, the The dimension accuracy of the profile should be strictly controlled within the given tolerance; in order to quantitatively judge the profile manufacturing error of the blade, carry out reverse modeling of the blade surveying and mapping sample, carry out molding deformation analysis or reverse adjustment of the cavity of the mold forming blade, all It is necessary to obtain the blade profile data first; therefore, how to efficiently and accurately realize the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/20
Inventor 汪文虎赵德中崔康靳洪超裴景东王姝成浪永王渊彬解晓娜张艳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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