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Method for determining optimal position of single-roller heavy reduction on line

A technology under optimal position and under heavy pressure, which is applied in the field of continuous casting and rolling, can solve the problems of no method, difficulty in determining the optimal position, uneven solidification structure, etc., and achieve the minimization of the reduction force and the improvement of the service life Effect

Active Publication Date: 2021-09-24
CONTINUOUS CASTING TECH ENG OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]But for the single-roller heavy reduction technology, the reduction is only carried out at a single point on a single roller, and the position of the reduction is required to be more precise. At present, both in theory and in practice In effect, there is no effective method to accurately find the optimal pressing position under single-roll heavy pressing, so as to achieve a comprehensive solution to the internal quality of the slab, that is, to increase density, reduce segregation, eliminate shrinkage cavities and reduce porosity
In particular, there is no related method to find the optimal pressing position under single-roller heavy pressing online
Especially for the slab, there is uneven solidification structure in the width direction in the later stage of solidification, and it is difficult to determine the optimal position under single-roller heavy reduction, and for the slab, the further the pressing position is, the lower the pressing force is. The increase in multiples will bring difficulties to the design and service life of the pressing equipment

Method used

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  • Method for determining optimal position of single-roller heavy reduction on line
  • Method for determining optimal position of single-roller heavy reduction on line
  • Method for determining optimal position of single-roller heavy reduction on line

Examples

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Effect test

Embodiment 1

[0098] Taking the continuous casting of 400mm×2500mm slab in a steel plant as an example, there are three pressing positions for single-roll heavy pressing, and the distances from the crystallizer liquid level are 23m, 24m and 25m respectively.

[0099] Under a specific pulling speed condition, under the 10mm single-roll heavy pressing of the three rolls in stages, the obtained reduction force changes as follows figure 2 shown. If it is known that the optimal reduction force corresponding to the preset reduction amount of 10mm is 320T, from figure 2 It can be seen that the position closest to the optimal pressing force is the pressing position 2, so the pressing position 2 is the optimal pressing position under single-roll heavy pressing, and the cross-section of the slab corresponding to this pressing position is determined by the temperature field calculation model The solid fraction corresponding to the upper geometric center is 0.75. At the same time, from figure 2 I...

Embodiment 2

[0101] Under a certain pulling speed condition, at different solidification positions of the slab, each solidification position performs a single-roll reduction with different reductions, and the variation trend of the reduction force is obtained as follows: image 3 , where single-roll reductions of 2 mm, 4 mm, 6 mm, 8 mm and 10 mm were individually performed at three pressing positions. from image 3 It can be seen that under different amounts of single-roll heavy reduction at the reduction position 3, the change of the reduction force is obviously much higher than that of the reduction position 1 and the reduction position 2, because the slab at the reduction position 3 is softer The areas in the area have been few or disappeared, shrinkage cavities have been formed, and the compression resistance is not only the thickness of the shell on both sides in the width direction, but also produces a large deformation resistance in the central area; while the compression position 1...

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Abstract

The invention provides a method for determining an optimal position of single-roller heavy reduction on line, which comprises the following steps of: carrying out single-roller heavy reduction on different reduction positions of a casting blank by adopting preset reduction in a casting blank drawing direction; acquiring a reduction force output by a single roller at each reduction position, and according to the change condition of the reduction force output by the single roller at the adjacent reduction positions, determining the optimal reduction force; and taking the reduction position corresponding to the optimal reduction force as the optimal pressing position. By means of the method disclosed by the invention, the problem of lack of a method capable of accurately determining the optimal reduction position of the single-roller heavy reduction to comprehensively solve the internal quality of a casting blank currently in the prior art can be solved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting and rolling, and more specifically relates to an online method for determining the optimal position of a single roll under heavy pressure. Background technique [0002] The internal defects of continuous casting slab mainly include center segregation, center porosity and shrinkage cavity. The internal defects of the continuous casting slab will cause defects such as delamination, banding, unqualified flaw detection, and unqualified uniformity of microstructure and properties of the rolled end product, which will have an important impact on the quality and performance of the slab, and even lead to rejection. [0003] In order to solve the internal defects of the continuous casting slab, the most direct and effective technology is the pressing technology. Reduction technology is currently widely used, and different modes have been developed, mainly including light reduction, heavy reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
CPCB22D11/16
Inventor 钱亮姜敏李泽林谢长川韩占光周干水
Owner CONTINUOUS CASTING TECH ENG OF CHINA