Roll gap dynamic control method based on continuous casting billet apparent heat shrinkage

Abstract

The invention discloses a roll gap dynamic control method based on continuous casting billet apparent heat shrinkage. The roll gap dynamic control method includes the steps that a continuous casting billet solidification simulation mathematical model is established; preset molten steel solidification basic parameters and real-time collected production process parameters are input into the continuous casting billet solidification simulation mathematical model for temperature field simulation calculation to obtain continuous casting billet solidification temperature field distribution; accordingto the continuous casting billet solidification temperature field distribution and a pre-measured steel type thermal expansion curve, the casting billet solidification apparent heat shrinkage amountis obtained; according to the casting billet solidification apparent heat shrinkage amount and the distances of sector sections from the meniscus surface of a crystallizer, the continuous casting billet apparent heat shrinkage amounts of the sector sections are obtained; according to the continuous casting billet apparent heat shrinkage amounts of the sector sections and the size of a lower mouthof the crystallizer, roll gap set values of the sector sections are obtained; and the roll gap set values are input into a controller, and actual roller gap values of the sector sections are dynamically adjusted in real time through the controller. According to the roll gap dynamic control method, roller gaps of the sector sections can be prevented from being too large or too small, and stable production of a continuous casting machine is ensured.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a dynamic control method for roll gaps based on the apparent heat shrinkage of continuous casting slabs. Background technique [0002] During the continuous casting production process, the high-temperature liquid molten steel is continuously cooled and solidified in the slab support and guide device (mold and fan section), and finally forms a solid continuous casting slab of a certain shape. During the solidification process of continuous casting, the transformation of molten steel into solid slab will result in a reduction in volume and size. This phenomenon is a physical property of the alloy itself and cannot be avoided in production. In the continuous casting process, the shrinkage of molten steel mainly includes the following three methods: 1) liquid shrinkage: the shrinkage from the pouring temperature to the liquidus temperature; 2) solidification shrinkage: the volume ...

AI Technical Summary

Problems solved by technology

However, the solidification shrinkage of molten steel is affected by technological parameters such as steel type, molten steel pouring temperature, casting speed, and cooling intensity. If the roll gap is not adjusted during the steel pouring process, the roll gap may be too large or too small. The situation leads to the occurrence of continuous casting slab quality accidents and affects the smooth production of continuous casting machines

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