SU787124A1

SU787124A1 - Method of regulating width of hot-rolled strips

Info

Publication number: SU787124A1
Application number: SU782567691A
Authority: SU
Inventors: Евгений Александрович Руденко; Юрий Вячеславович Коновалов; Владимир Викторович Оробцев; Таисия Серафимовна Литвинова
Original assignee: Донецкий научно-исследовательский институт черной металлургии
Priority date: 1978-01-10
Filing date: 1978-01-10
Publication date: 1980-12-15

Description

1one

Изобретение .относитс к прокатному производству и может быть использовано при прокатке тонких гор чекатаных полос.The invention relates to rolling production and can be used in rolling thin hot rolled strips.

Известен способ регулировани ширины гор чекатаных полос при прокатке в чистовой группе клетей непрерывного стана путем изменени неравномерности деформации во второй клети по ширине полосы с выпуклым профилем, полученным при прокатке полосы в nepBOfT клети. Неравномерность деформации создаетс за счет изменени выпуклости профил полосы при прокатке в первой клети при неизменности толщины полосы И.There is a method of adjusting the width of hot rolled strips when rolling in the finishing group of the stands of a continuous mill by changing the non-uniformity of deformation in the second stand across the width of the strip with a convex profile obtained by rolling the strip in the nepBOfT stand. The unevenness of the deformation is created by changing the convexity of the profile of the strip during rolling in the first stand, while the thickness of the strip I.

Недостатками способа вл ютс необходимость применени специальных средств дл регулировани профил межвалкового зазора в первой клети , например устройства дл гидроизгиба валков, кроме того, ограниченный диапазон изменени выпуклости профил полосы посредством гидроизгиба валков, особенно на станах с короткой бочкой валков.и соответственно ограниченные возможности регулировани ширины полосы. Кроме того, в результате изменени температуры полосы дл стабилизации точности полосы по ширине требуютс значительные корректиров и ширин -: полосы зз процессе прокатки.The disadvantages of the method are the need to use special means for adjusting the roll gap in the first stand, for example, roll roll bending devices, in addition, a limited range of changes in the convexity of the strip profile through roll bending, especially on mills with a short roll roll and correspondingly limited width adjustment stripes. In addition, as a result of a change in strip temperature, significant adjustments and widths are required to stabilize the accuracy of the strip across the width of the rolling process.

Цель изобретени - кскл;очение специальных технических средств регулировани профил межвалкового зазора и расц ирение диапазона регулировани .The purpose of the invention is to add special technical means for adjusting the roll gap and to calculate the adjustment range.

Цель достигаетс те:.-., что измене10 ние HepaBEiOMOpHocTH дефор:.ации по ширине полосг во второй клети осуществл ют изменением толщины полосы , поступающей из первой клети, при неизменной выпуклости ее профил , The goal is achieved by: .-., That the change in the HepaBEiOMOpHocTH deformation: across the width of the stripes in the second stand is carried out by changing the thickness of the strip coming from the first stand, with a constant convexity of its profile,

15 причем увеличивают обжатие полосы в первой клети при необходимости уменьшени ее ширины и, наоборот, уменьшают обжатие дл ее увеличени , при этом участок полосы, длиной, 15 and increase the compression of the strip in the first stand, if necessary, reduce its width and, conversely, reduce the compression to increase it, while the portion of the strip, length,

20 соответствующей длине первого межклетевого промежутка, прокатывают с увеличением обжати к концу полосы .20 corresponding to the length of the first interstand gap, rolled with an increase in compression to the end of the strip.

На чертеже представлен график, The drawing is a graph

25 по сн ющий данный способ.25 which explains this method.

Claims

The graph is based on the results of a pilot rolling on a wide-strip hot rolling mill and expresses the combined effect of relative sizes g. and non-uniformity of deformation q on the change of the width of the B band in the second stand. The non-uniformity of the altitude deformation across the width of expression 1a by the difference in relative transverse thickness differences at the entrance and exit from the cage. From the graph: a it can be seen that there is a simultaneous change in e. and d significantly more effectively affects the redistribution of stretch widths and, therefore, dv, i.e. Adjusting the width by changing S and l is not an algebraic sum of the influence of each parameter on db, since with increasing l the intensity The effect of K on DV is increasing. The maximum width variation range of the proposed method is determined by the expression. g -k one . Y max Y VwvA coefficients taking into account the effect of uneven compression across the width of the deformation zone; the relative deformation ensures compression of the convexity of the roll. . In order to obtain a convex profile, the stripes are rolled in the first stand of the finishing group of a wide-strip mill in rolls with concave profiling. To compensate for the effect on the width of the strip, for example, the temperature wedge of the strip along the entire length, it is rolled in the first stand with variable compression, the intensity of which is proportional to the change in the width of the strip at the exit of the stand. At the same time, due to the relatively high banding mills of the roll barrel, the convexity of the strip along its length remains almost unchanged. When rolling a strip of a variable profile along the width and variable thickness along the second cell, an identical distribution of the stretch across the width of the strip along its length, due to which the broadening is corrected and the width of the band is stabilized. Since the rear end of the strip is rolled without tension in all the gaps of the mill, the intensity of the increase in reduction to the end of the strip can be roughly assumed to be proportional to the total intercellular tension. Thus, adjusting the width of the proposed method makes it possible to almost completely compensate for the width difference along the length of the strip. Claim 1. Method of adjusting the width of hot rolled strips, when rolling in the stand group of a continuous mill, by changing the non-uniformity of deformation in the second stand across the width of the strip with a RING profile obtained by rolling the strip in the first stand, characterized in that the means of adjusting the roll gap profile and expanding the range of adjustment, the said change in the irregularity of deformations lio the width of the strip in the second stand is carried out by changing the thickness of the polo The flow coming from the first stand, with a constant convexity of its profile, increases the compression of the strip in the first stand if necessary to reduce its width and, conversely, reduce the compression to increase it.

2. A method according to claim 1, characterized in that, in order to eliminate the broadening of the rear end of the strip being rolled without tension, the section of the strip corresponding to the first inter-stitch gap is rolled with increasing crimping towards the end of the strip. Sources of information taken into account in the examination. 1. USSR author's certificate No. 375109, cl. B 21 B 1/38, 1971.

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