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Probe ball-measuring three-dimensional semidiameter compensation method through blade section contact type scanning measurement

A radius compensation and contact technology, applied in the direction of measuring devices, instruments, etc., can solve problems such as cosine error, and achieve the effect of improving the accuracy of radius compensation

Active Publication Date: 2019-08-16
HUST WUXI RES INST
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a three-dimensional radius compensation method of the probe measuring ball for contact scanning measurement of the blade cross section, so as to solve the cosine error that occurs during the radius compensation of the blade cross section scan

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  • Probe ball-measuring three-dimensional semidiameter compensation method through blade section contact type scanning measurement
  • Probe ball-measuring three-dimensional semidiameter compensation method through blade section contact type scanning measurement
  • Probe ball-measuring three-dimensional semidiameter compensation method through blade section contact type scanning measurement

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0039] The present invention provides a three-dimensional radius compensation method of a probe ball for blade section contact scanning measurement, which includes the following steps:

[0040] Step S101, using the coordinate system XYZ as the method based on the coordinate system of the blade to be measured, and taking the center point M of each measuring ball measured in three coordinates as the NURBS (Non-Uniform Rational B-Splines) curve Type value point P, use the cumulative chord length method to calculate the node vector K of the NURBS curve, and calculate the basis function matrix N of the NURBS curve i,m ; Inversely calculate the control vertex matrix D according to the type value point matrix to make the fitted NURBS curve pass the type value point;

[0041] specifically,

[0042] Based on the coordinate system of the blade to be measured, the coordinate syst...

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Abstract

The invention provides a probe ball-measuring three-dimensional semidiameter compensation method through blade section contact type scanning measurement. The method comprises the following steps: taking each ball-measuring center point M of three-coordinates measurement as a data point P of a NURBS curve, computing a node vector K of the NURBS curve by utilizing an accumulative chord length method, and computing a primary function matrix Ni, m of the NURBS curve; inversely computing a control vertex matrix D according to the data point matrix, and enabling the fitted NURBS curve to pass through the data point; equidistantly dispersing the NURBS curve, and computing normal vector Nxy of the discrete points in parallel to an XY plane, wherein a projection point, in a plane of the leaf section along a Z-axis direction, of the discrete point O is O'; computing the vector, and enabling the vector to be equal to a direction of the Nxy in the XY plane direction, wherein the component of the vector in the Z-axis direction is zero, and the generated compensation vector is the compensation three-dimensional semidiameter compensation vector. The method provided by the invention solves cosineerror of the leaf section scanning when performing the semidiameter compensation.

Description

Technical field [0001] The invention relates to the technical field of three-coordinate measuring machine measurement, in particular to a method for compensating the three-dimensional radius of a probe ball for blade section contact scanning measurement. Background technique [0002] Blades have important applications in aero-engines, turbines, wind power generation and other fields. At the same time, the requirements for blade processing and inspection accuracy are increasing. In the current blade inspection, contact and non-contact inspection methods are mainly used. The detection accuracy of the former has an error of tens of microns compared with the latter, and it can only be used for some low accuracy requirements or large workpieces. For high-precision blade inspection, the coordinate measuring machine is the first choice. In order to reduce the wear of the stylus during the scanning process, an anti-wear ruby ​​ball is added to the tip of the stylus as the measuring ball....

Claims

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Application Information

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IPC IPC(8): G01B21/00
CPCG01B21/00
Inventor 张旭王振友朱利民
Owner HUST WUXI RES INST
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