Online prediction and positioning method for internal crack of slab continuous casting

Abstract

The invention relates to an online prediction and positioning method for an internal crack of slab continuous casting, and belongs to the technical field of continuous casting. A three-dimensional temperature field of a continuous casting blank is monitored online in real time; the bulging strain of each slicing unit and the total strain of the casting blank at each clamping roller in the monitoring area are calculated in real time according to present real-time casting blank three-dimensional temperature field information, casting equipment parameter information, production process parameterinformation and casting steel type parameter information and by means of a bulging strain model, a bending / straightening strain model and a non-centering strain model; and the critical strain of the casting blank is set according to the casting steel type, when the bulging strain of the slicing unit or the total strain of the casting blank in the monitoring area exceeds the ultra-high critical strain, an internal crack occurs, and the specific position of the internal crack of the casting blank is located. According to the method, the real-time online prediction accuracy for the internal crackof the slab continuous casting can be improved, the occurrence position of the internal crack can be located, then cutting of the casting blank is optimized, the detection time and cost are saved, and the qualified rate of products is increased.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and relates to a method for online prediction and positioning of internal cracks in slab continuous casting. Background technique [0002] As the core issue that continuous casting producers are most concerned about, the quality of continuous casting slabs has long been highly concerned by iron and steel production enterprises, engineering design units and scientific research institutions. If the quality of each cut-to-length slab produced on-site can be predicted in real time online to determine whether it is suitable for hot delivery or whether it needs to be cleaned off-line and how to clean it, it will greatly improve the rolling yield of the slab, reduce the scrap rate and production management costs, has very important practical significance. [0003] Slab continuous casting internal cracks are a common quality defect in the production process, including triangular cracks, middl...

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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a method for online prediction and location of internal cracks in slab continuous casting, which is used to solve the problem that the accuracy rate of existing prediction methods is not high, and the occurrence of internal cracks in the lateral direction of the slab cannot be accurately located. location problem

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