Measuring method for correcting reference point coordinates based on thermal expansion coefficient

A technology of thermal expansion coefficient and measurement method, applied in measurement devices, instruments, etc., can solve the problems of inaccurate measurement results, theoretical reference point deviation, etc., to reduce measurement errors, reduce fitting errors, and make measurement results more realistic and reliable. letter effect

Active Publication Date: 2021-04-30
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, the present invention proposes a measurement method based on the thermal expansion coefficient to correct the coordinates of the reference point, which can effectively solve the problem of inaccurate measurement results caused by the offset of the theoretical reference point before and after demoulding of composite parts

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  • Measuring method for correcting reference point coordinates based on thermal expansion coefficient

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Embodiment 1

[0022] As the basic embodiment of the present invention, the present invention includes a method of measuring the coordinates of the reference point based on thermal expansion coefficient correction, including the following steps:

[0023] a. Determine the origin of the coordinates: establish a measurement coordinate system, and use the point G of the center of gravity of the part as the origin (0,0,0) of the measurement coordinate system.

[0024] b. Conversion of the original reference point coordinates: according to the coordinates of the center of gravity position G point on the actual part, a series of original reference point coordinates on the part are converted into coordinate points relative to the center of gravity position G point in the measurement coordinate system, the original The reference point A is (x, y, z).

[0025] c. Correction of reference point coordinates: After demoulding, the original reference point A (x, y, z) becomes the correction reference point...

Embodiment 2

[0031] As the best implementation mode of the present invention, with reference to the attached figure 1 , the present invention includes a measurement method for correcting reference point coordinates based on coefficient of thermal expansion, including a measurement preparation process and a measurement implementation process. The measurement preparation process includes: determining the coordinate origin as the center of gravity of the part, converting the coordinates of the original reference point, and correcting the coordinates of the reference point. The measurement implementation process includes: measuring the coordinates of the actual reference point, fitting the reference point and establishing a system, and measuring the shape of the part.

[0032] The measurement method specifically includes the following steps:

[0033] a. Determine the coordinate origin: establish a measurement coordinate system, and use the center of gravity position G on the part as the origi...

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Abstract

The invention relates to the technical field of part deformation measurement, and particularly relates to a measurement method for correcting reference point coordinates based on a thermal expansion coefficient. The method comprises a measurement preparation process and a measurement implementation process. The measurement preparation process comprises the following steps: determining a coordinate original point as the gravity center of a part, converting original reference point coordinates and correcting reference point coordinates; and the measurement implementation process comprises the steps of measuring coordinates of a reference point, establishing a reference point fitting system and measuring the appearance of the part. By means of the method, the problem that the measurement result is inaccurate due to theoretical reference point offset before and after demolding of the composite part can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of component deformation measurement, in particular to a measurement method for correcting reference point coordinates based on thermal expansion coefficient. Background technique [0002] In the prior art, for demoulded composite parts, the reference of the part itself will be deformed due to curing, which will cause a slight offset of the reference of the part itself, resulting in a slight offset of the coordinate system established with the reference on the part, resulting in a negative impact on the subsequent measurement results. influences. According to relevant experimental research, 55% of the deformation of composite parts is due to the inconsistency of thermal expansion coefficient, 35% is due to curing shrinkage, and 10% is due to the influence of tooling. However, the existing methods usually ignore the influence of this deformation during the entire curing process, and ignore the inconsistency ...

Claims

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Application Information

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IPC IPC(8): G01B21/32
CPCG01B21/32
Inventor 赵文琛程勇崔博杨永忠
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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