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Slab manufacturing method, and control device

A manufacturing method and casting technology, which are applied in the direction of rolling force/roll gap control, metal rolling, etc., can solve problems such as failures of passing plates, and achieve the effect of reducing failures of passing plates

Active Publication Date: 2021-06-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a wedging occurs, meandering (meandering, creeping, zigzag) may occur in the rolling mill arranged downstream of the casting drum in the casting direction, and it may cause failure of plate passing (steel plate passing)

Method used

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  • Slab manufacturing method, and control device
  • Slab manufacturing method, and control device
  • Slab manufacturing method, and control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0166] In this example, in order to confirm the effect of the present invention, a cast slab was produced using the continuous casting facility 1 shown in the above-mentioned embodiment. The casting drum used in this embodiment is a drum with a body length of 1000mm. Regarding the cylinder position, pressure, and plate thickness in the rolling mill, the values ​​of the constant parts are used. The constant part mentioned here refers to the pressure caused by the control of the pressing position of the left and right cylinders of the rolling mill, which is implemented so that the difference between the entering wedge ratio and the exit wedge ratio of the rolling mill is small. The part where the lower position change becomes smaller. In this example, the average value of each value in the time from 1 minute and 30 seconds after the start of rolling to the time of 1 minute and 40 seconds was used.

[0167] Various conditions and values ​​in each Example and Comparative Example...

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PUM

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Abstract

In this slab manufacturing method provided in the invention, casting drum housing rolling system deformation characteristics which were acquired prior to the start of slab casting and which indicate deformation characteristics of a housing supporting a casting drum and deformation characteristics of a screw-down system for screwing down the casting drum are used to calculate an estimated plate thickness of a slab at both ends in the width direction on the basis of formula 1 ((Estimated plate thickness at rolling mill entry side) = (Screw-down position of casting cylinder) + (Elastic deformation of casting drum) + (Casting drum housing screw-down system deformation) + (Drum profile of casting drum) - (Elastic deformation of casting drum at time of screw-down position zero-point adjustment)), the entry-side wedge ratio and the exit-side wedge ratio are calculated on the basis of the estimated plate thickness, which is calculated with formula 1, and the screw-down position of the rolling mill is adjusted such that the difference between the entry-side wedge ratio and the exit-side wedge ratio is within a prescribed range.

Description

technical field [0001] The present invention relates to a manufacturing method and a control device for a cast slab. [0002] This application claims priority based on Japanese Patent Application No. 2018-198356 filed on October 22, 2018, the contents of which are incorporated herein. Background technique [0003] The production of a thin metal strip (hereinafter referred to as a cast strand) uses a twin-drum continuous casting apparatus as disclosed in Patent Document 1, for example. The double-drum continuous casting device arranges a pair of casting drums for continuous casting (hereinafter referred to as casting drums) in parallel, and rotates the opposing peripheral surfaces from above to downward, and pours the molten metal formed by the peripheral surfaces of these casting drums. The molten metal is poured into the storage part, and the molten metal is cooled and solidified on the peripheral surface of the casting drum to continuously cast a thin metal strip. A pair...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/58B21B1/00B22D11/06B22D11/12
CPCB22D11/06B22D11/12B21B37/66B21B37/58B21B1/00B21B1/04B21B2001/028
Inventor 新国大介白石利幸左田野豊宫嵜雅文
Owner NIPPON STEEL CORP