Method for measuring sheet metal deformation based on images

A processing method and sheet metal technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems that cannot be applied mechanically, cannot be widely used, and cannot meet the requirements of time series measurement, so as to achieve the goal of improving comparability and high guiding significance Effect

Inactive Publication Date: 2009-09-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

But the price is very expensive, and it has not been optimized for my country's national standards. For ordinary schools and general scientific research units, there is still a lack of purchasing power, so it cannot be widely used.
Some engineering structures and material deformation measurement technologies have also been developed in China (Chinese patent, application number 03128736.0, publication number CN1458528A), and this type of image measurement device is not suitable for the strain measurement of the sheet metal formability test under laboratory conditions. Meet the requirements of time series measurement, and the post-processing cannot apply the corresponding domestic and international standards

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  • Method for measuring sheet metal deformation based on images
  • Method for measuring sheet metal deformation based on images
  • Method for measuring sheet metal deformation based on images

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0027] Such as figure 1 , figure 2 As shown, the image-based sheet metal deformation measurement processing method adopts a multi-axis rotation and lifting structure 1, a CCD camera and an optical lens 2, and an image and data processing computer 3, wherein the CCD camera and optical lens 2 are set on the multi-axis rotation and lifting On structure 1, the data output end of CCD camera and optical lens 2 is connected to the data input end of image and data processing computer 3, it is characterized in that described measurement processing method comprises the following steps:

[0028] Step 1: Print a grid conforming to the national standard GB / T 15825.8-1995 or ISO12004 on the surface of the sheet;

[0029] The second step: the images of the sheet before and after deformation are taken by the CCD camera and the optical lens and stored in the image and data proc...

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Abstract

The invention discloses a method for measuring sheet metal deformation based on images, which adopts a multi-axis rotation and lifting structure, a CCD camera, an optical lens, and an image and data processing computer. The images of a sheet metal before and after deformation are shot and stored in the image and data processing computer to form data files; and a forming limit diagram and parameter information are acquired through a bulging test and a tension test respective to form standard data files. The method can store and analyze material performance in various aspects so as to screen spare sheet metals from various aspects.

Description

technical field [0001] The invention relates to a measurement technology for engineering structure and material deformation in the field of optical mechanical image analysis. Background technique [0002] Mesh strain measurement of sheet metal is an important method for studying sheet metal forming properties. Scientists studying sheet metal forming in the United States and other countries began to apply it in practice as early as the 1960s. For ordinary unidirectional tensile tests, displacement sensors can be used to measure and calculate the deformation and strain of the sheet. But for the local strain and the strain measurement of each part after the plastic deformation of the large plate, the ordinary method is powerless. [0003] For this type of measurement, only the coordinate grid method can be used, that is, the grid with known length is printed on the sheet without plastic deformation in advance, and the deformation of the grid is measured to analyze the deformat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 徐岩顾然
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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