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On-line detection method of continuous casting billet surface longitudinal crack

A detection method and technology for longitudinal cracks, applied in the field of continuous casting of iron and steel metallurgy, can solve the problems of economic loss, casting billets judged as waste products, etc., and achieve the effect of eliminating interference

Inactive Publication Date: 2014-12-03
DALIAN UNIV OF TECH
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Problems solved by technology

[0002] Longitudinal cracks are common quality defects on the surface of continuous casting slabs. If the longitudinal cracks are severe, the slabs will be directly judged as waste products, resulting in huge economic losses.

Method used

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  • On-line detection method of continuous casting billet surface longitudinal crack
  • On-line detection method of continuous casting billet surface longitudinal crack
  • On-line detection method of continuous casting billet surface longitudinal crack

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Embodiment Construction

[0065] figure 1 It is a block diagram of visual prediction of continuous casting slab longitudinal cracking. Depend on figure 1 It can be seen that the visual detection method of continuous casting slab longitudinal cracks based on computer vision is divided into the following four parts: crystallizer copper plate temperature visualization, cold spot area segmentation, cold spot area feature information extraction, longitudinal crack feature identification and prediction.

[0066] The present invention will be further described in detail through specific embodiments below in conjunction with the accompanying drawings.

[0067] The first step, crystallizer copper plate temperature and its temperature difference visualization

[0068] figure 2 It is a schematic diagram of copper plate expansion and thermocouple arrangement of wide-face and narrow-face crystallizers. The length of the mold of the continuous casting machine is 900mm, and it is composed of four copper plates, ...

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Abstract

The invention relates to an on-line detection method of continuous casting billet surface longitudinal crack, belonging to the technical field of iron and steel metallurgy continuous casting detection. The method comprises the steps of showing the temperature difference value of a copper plate of a crystallizer to scene control personnel in a form of two-dimensional thermal image by detecting the temperature signal of a thermoelectric couple of the copper plate of the crystallizer; searching the abnormal change of temperature by utilizing computer vision technology according to the characteristics of formation of the surface longitudinal crack in the crystallizer and the temperature distribution; marking the crack area in the thermal image, extracting the geometry and movement characteristics of the crack area, and carrying out on-line detection on the formation and the development processes of the casting surface longitudinal crack. According to the method, crystallizer visualization is organically combined with the computer vision technology, so that the whole process of formation, expansion and movement of the casting billet surface longitudinal crack can be shown in a visual way. The limitation that the longitudinal crack is judged only according to the one-dimensional temperature trend can be overcome, the accuracy of longitudinal crack detection result is improved, and the method has a positive effect of controlling the quality of continuous casting billet.

Description

technical field [0001] The invention relates to an online detection method for longitudinal cracks on the surface of continuous casting slabs, belonging to the technical field of iron and steel metallurgy continuous casting detection. Background technique [0002] Longitudinal cracks are common quality defects on the surface of continuous casting slabs. If the longitudinal cracks are severe, the slabs will be judged as waste products directly, resulting in huge economic losses. Therefore, when longitudinal cracks appear on the surface of the slab, it is necessary to find out in time and take measures to inhibit the development of the longitudinal cracks and reduce the harm of the longitudinal cracks to the quality of the slab. [0003] The formation process of the longitudinal cracks on the surface of the slab is complicated, and the main influencing factors are the casting process, the high-temperature mechanical properties of the steel, the solidification process of the sl...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 王旭东姚曼刘宇
Owner DALIAN UNIV OF TECH
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