Method for predicting and controlling solidification of casting flow in secondary cooling segment in continuous casting process

Abstract

The invention discloses a method for predicting and controlling solidification of casting flow in a secondary cooling segment in a continuous casting process. The method comprises the following steps: firstly acquiring relevant parameter information of the original casting state of liquid steel, and carrying out initialization; estimating a solidification cooling process of the casting flow; when casting flow slices are located at the tail end of a first segment, calculating the temperature of casting flow and a set target temperature of the first segment, making comparison, if the difference of the two temperature is smaller than a constant value, sending the casting flow slices to the next segment, calculating, otherwise, correspondingly regulating cooling water volume Q of the first segment, returning the casting flow slices to an initial position of the first segment, recalculating the cooling process, and circulating the process until the calculated temperature approximates the target temperature; and finishing the calculation when the solidification process of the casting flow in each region of the secondary cooling segment meets an expected object, the casting flow slices move to the tail end of whole secondary cooling segment and the control process meets the requirements. By combining the specific actual production, the solidification heat transfer process of the liquid steel in the secondary cooling segment is accurately predicted, and reliable judgment is provided for the continuous casting production.

Description

technical field [0001] The invention belongs to the technical field of advanced industrial manufacturing control, in particular to a method for predicting and controlling the solidification of the strand in the secondary cooling section of the continuous casting process. Background technique [0002] Although the cast strand coming out of the crystallizer has formed a solidified slab shell on the outside, it is still in a liquid state at a relatively high temperature inside. In order to promote its solidification, it is forced to cool in the secondary cooling zone. In the cooling process, a reasonable cooling process is critical to produce high-quality billets, and the process should follow the corresponding metallurgical guidelines. In addition, when the molten steel in the slab is close to the end of solidification, reasonable physical extrusion of the slab will also help to improve the internal quality of the slab. In order to judge whether the cooling process is reasona...

AI Technical Summary

Problems solved by technology

[0003] In response to the above problems, some solutions have been proposed. At present, some thermometers can detect the surface temperature of the strand in the secondary cooling section. However, due to the harsh working environment, the reliability of the instruments is not guaranteed, increasing usage cost

In addition, there is another detection of the solidification process of the strand, which can be realized through the nail shooting test, but this method is an offline analysis method, and the online real-time detection of the solidification process of the strand has not yet been solved.

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