Control method and device under continuous casting weight

Abstract

The invention provides a control method and a control device under continuous casting weight. The method comprises the steps of performing real-time tracking to calculate a casting blank temperature field, so as to obtain a center solid fraction of a casting blank; determining the position of the casting blank when the weight is performed, wherein the position is in the scope of between 0.6 of the center solid fraction of the casting blank and 1.5m behind a solidification position; and pressing an upper roller of a withdrawal and straightening roller at a weighting position so as to weight the casting blank. The device comprises a tracking unit, a determining unit and a roll gap control unit, wherein the tracking unit is used for performing real-time tracking to calculate a casting blank temperature field, so as to obtain the center solid fraction of the casting blank, the determining unit is used for determining the position where the casting blanks performs weighting, and the position is in the scope of between 0.6 of the center solid fraction of the casting blank and 1.5m behind the solidification position, and the roll gap control unit is used for pressing the upper roller of the withdrawal and straightening roller at the weighting position so as to weight the casting blank. According to the control method and the control device under continuous casting weight provided by the invention, microstructures and metallographic structures in the center of the casting blank can be improved, the center segregation and looseness of a continuous casting blank can be effectively reduced, the shrinkage cavity can be eliminated, the pressing efficiency can be improved, and the pressing effect can be stabilized.

Description

technical field [0001] The invention relates to the field of continuous casting, and more specifically, to a continuous casting heavy reduction control method and device. Background technique [0002] In the billet continuous casting process, such as figure 1 As shown, the molten steel passes through the crystallizer 3 from the ladle 1 and the tundish 2 to form a cast slab 100 with the outer shell solidified and the center as the molten steel after being cooled and crystallized once, and is pulled out from the lower mouth of the mold 3, and the cast slab 100 forms a bend in the mold 3. Moon side 30. After the cast slab 100 is pulled out from the lower mouth of the crystallizer, after secondary cooling, after being straightened by the stretching and straightening rolls (note that only a part of the stretching and straightening rolls are shown in the figure), it passes through the pre-cutting roller table to reach the hot cutting machine. Machine 4 cuts the slab. In the abo...

AI Technical Summary

Problems solved by technology

Due to the large difference between billet liquid core width and surface width, the reduction efficiency of using light reduction technology to improve the internal quality of the billet is relatively low, and the improvement effect is not obvious

In addition, due to the relatively small number of stretching and leveling machines, the billet production process (pulling speed, tundish temperature, etc.) is difficult to maintain stability, resulting in the effect of improving the internal quality of the billet is also difficult to stabilize

[0005] None of the above methods can change the microstructure and metallographic structure of the slab center, so that there are harmful Widmanstattenites on the grain boundaries, which is not conducive to later rolling

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