Method and device for controlling roller seam deviation in soft pressing process or hard pressing process

Abstract

The invention provides a method and device for controlling roller seam deviation in a soft pressing process or a hard pressing process. The method comprises the steps that a dynamic pressing control model is established, and a target roller seam value of a withdrawal and straightening machine executing pressing is obtained according to the actual solidification state of and production technological parameters of a casting blank; the real-time target roller seam value existing in the process of reaching the target roller seam value is obtained according to the pressing speed; the actual roller seam value of the withdrawal and straightening machine in the pressing process is obtained through the reading of a withdrawal and straightening machine displacement sensor; whether the deviation between the actual roller seam value of the withdrawal and straightening machine and the real-time target roller seam value is within a control precision range or not is judged; if the roller seam deviation is within the control precision range, the pressing process continues to be conducted till the roller seam of the withdrawal and straightening machine reaches the target roller seam value; and if the roller seam deviation is not within the control precision range, pressing is stopped. According to the method and device for controlling roller seam deviation in the soft pressing process or the hard pressing process, the roller seam deviation is monitored in the pressing process, intermediate cracks of the casting blank are avoided, it is guaranteed that the pressing amount is within the control precision range, and the internal quality improving effect is remarkable.

Description

technical field [0001] The invention relates to the field of continuous casting, and more specifically relates to a method and device for controlling roll gap deviation during light reduction or heavy reduction. Background technique [0002] In the field of continuous casting, such as figure 1 As shown, the molten steel passes through the crystallizer 3 from the ladle 1 and the tundish 2 for primary cooling and crystallization to form a cast slab 100 whose outer shell is solidified but the center is still molten steel. After being straightened by the straightening machine 200, it passes through the pre-cutting roller table to the fire cutter 4 to cut the slab. During the above pouring process, the cast strand is continuously solidified from the outside to the inside under the action of external cooling, and the resulting solidification shrinkage can flow from the center. However, at the end of solidification, due to the increase of flow resistance of molten steel in the two...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the deviation between the actual roll gap value and the target roll gap value is not monitored during the reduction process under light reduction or heavy reduction. When there is a large positive deviation between the actual roll gap value and the target roll gap value, the Under the effect of light reduction or heavy reduction, the effect of improving the internal quality of the slab is not obvious, and even the internal quality of the slab cannot be improved; when there is a large negative deviation between the actual roll gap value and the target roll gap value, it will cause slab Overpressure causes cracks in the middle of the slab to deteriorate the quality of the slab and cause damage to the tension leveler

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