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Steel plate width control method

A width control and width technology, applied in the direction of metal rolling stand, metal rolling mill stand, etc., can solve the problems that the mathematical model of rough rolling is difficult to adapt to the requirements of equipment and production process, the capacity of equipment cannot be fully utilized, and waste of resources and other problems , to achieve the effect of reasonable steel plate width control parameters, eliminating plate width oscillation phenomenon, and improving the qualified rate of width accuracy

Active Publication Date: 2010-12-29
ANGANG STEEL CO LTD
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Problems solved by technology

[0003] However, since the slab pressure gauge machine was not added during the transformation process, when the large vertical rolls of the first roughing mill cross-rolled large side-pressed slabs and equal-width slabs, there was a phenomenon of fluctuations in the width of the steel plate, that is, width oscillation. It is very easy to produce the problem of out-of-tolerance width of the finished strip steel, resulting in an increase in the strip width blockage rate and a decrease in the width pass rate
Therefore, it is necessary to continue to use equal-width slabs for rolling, so that the equipment capacity cannot be fully utilized, which greatly wastes resources
[0004] Analyze the main cause of width oscillation of rough-rolled steel plate, because the existing rough-rolling mathematical model is difficult to adapt to the requirements of equipment and production process
In particular, the inappropriate control parameters of the widening model are the main factors that cause width oscillations in the cross-rolling of large lateral pressure slabs and equal-width slabs. It meets the needs of production

Method used

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Experimental program
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Effect test

Embodiment 1

[0023] In the non-pressure sizing machine, the large vertical roll for rough rolling undertakes the main task of side pressure; the vertical roll mill for rough rolling cross-rolls strips of different widths.

[0024] Incoming slab specification: 135×1275mm; Finished steel strip specification: 2.95×1262mm; 2.95×1235mm;

[0025] The lateral pressure X is respectively: 13mm, 40mm;

[0026] The first rolling mill for rough rolling is a reversible rough rolling mill, which adopts 3-pass reversible rolling.

[0027] 1. Use the original rough rolling mathematical model width calculation formula, namely:

[0028] W OUT =W'+Lcw Lay ·{Aw Lay (j)·S ES +Aw Lay (l) ΔH+Aw Lay (k)·W′·ΔH}

[0029] The spread coefficient of the first pass of rough rolling is 0.85, and the spread coefficient of the mathematical model is reduced by 0.1 every time the slab is rolled back and forth. The actual rolling data is as follows:

[0030]

[0031] It can be seen from the above table that the ...

Embodiment 2

[0039] Rough rolling non-pressure sizing machine, the rough rolling large vertical roll undertakes the main side pressure task; the rough rolling vertical roll mill cross-rolls strips of different widths.

[0040] Incoming slab specification: 135×1275mm; Finished steel strip specification: 3.05×1250mm; 3.05×1210mm;

[0041] The lateral pressure X is respectively: 25mm, 65mm;

[0042] The first rolling mill for rough rolling is a reversible rough rolling mill, which adopts 3-pass reversible rolling.

[0043] 1. Using the calculation formula of the original mathematical model of rough rolling, the spread coefficient of the first pass of rough rolling is 0.85, and the spread coefficient of the mathematical model is reduced by 0.1 every time the slab is rolled back and forth. The actual rolling data is as follows:

[0044]

[0045] It can be seen that the deviation between the actual width of the rolled strip and the width of the finished strip is +30mm and +21mm respectively...

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Abstract

The invention provides a steel plate width control method, which comprises the following steps of: determining a mathematical model based on a rough rolling mathematical model setting and broadening coefficient according to a width difference between the width of an incoming slab and the width of a finished strip steel, namely a side pressure quantity, and adding a broadening compensation coefficient of between -0.1 and -0.65 into the mathematical model; and during the rolling process, adjusting the broadening compensation coefficient twice to thrice according to the practical rolling state and the strip steel width detection result, wherein the adjusting amplitude of each time is 0.1. Therefore, the method basically eliminates the steel plate width oscillation phenomenon, reduces the strip steel blockade rate generated by excessive width difference by 0.011 percent, improves the width precision qualification rate of the strip steel by 4.2 percent, and has quite remarkable economic benefit.

Description

technical field [0001] The invention belongs to the field of steel rolling technology, and in particular relates to a method for controlling the width of rough-rolled steel strip in hot continuous rolling production. Background technique [0002] At present, many steel rolling manufacturers in my country have carried out technological transformation on the hot continuous rolling production line, especially the vertical roll of the roughing mill, and thus greatly improved and enhanced the width control and side pressure capacity of the vertical roll of the roughing mill. The production capacity and rolling output have laid a solid foundation, and at the same time, it has provided a prerequisite for changing from the original rolling of equal-width slabs to a substantial increase in the rolling of large side pressure slabs. [0003] However, since the slab pressure gauge machine was not added during the transformation process, when the large vertical rolls of the first roughing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/22
Inventor 吴胜田车志良兰少岩杨洪涛赵勐
Owner ANGANG STEEL CO LTD
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