CN113361179A - Method for distributing full load regulations of angle rolling of heavy and medium plate mill - Google Patents
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Abstract
The invention discloses a full-load regulation distribution method for angle rolling of a heavy and medium plate mill, belongs to the technical field of rolling, and provides a full-load regulation distribution method for angle rolling of a heavy and medium plate mill aiming at production of a small-spread-ratio heavy and medium plate product. The problems that the conventional widening rolling method cannot give full play to equipment capacity and affects production efficiency are solved.
Description
Technical Field
The invention belongs to the technical field of rolling, and particularly relates to a full-load regulation distribution method for the angular rolling of a heavy and medium plate mill.
Background
The blank size specification used in the production of the heavy and medium plate mill is relatively fixed, especially the blank width, and the width of the blank can not be frequently adjusted by a continuous casting machine, so that the width of the blank is generally only fixed in a plurality of specifications. But the width dimension of the finished product of the medium plate product is very flexible, in order to achieve the target width, the steel rotating operation is needed during the production of the medium plate, the blank is rotated by 90 degrees and then rolled along the width direction of the blank, and the pressing in the thickness direction is converted into the widening in the width direction, so that the required target width dimension is obtained. As shown in fig. 1. However, if the difference between the width of the finished product and the width of the blank is small, the broadening pass can reach the target width only by small reduction, and at the moment, the rolling mill needs broadening rolling with small reduction in one pass, so that the equipment capacity of the rolling mill cannot be fully exerted, and the production efficiency is seriously influenced.
For the practical situation of such production, the rolling can be performed by means of angle rolling, as shown in fig. 2. And (4) rotating the rolled piece in the 1 st pass by a certain angle, and biting the rolled piece at an oblique angle. And after the 1 st pass rolling is finished, the shape of the rolled piece is changed into a parallelogram. In the subsequent 2 nd pass, the rolled piece rotates in the opposite direction, and is obliquely engaged again, and the rolled piece becomes rectangular again after the rolling is finished. And the width of the rolled piece reaches the target width through two times of angle rolling. When the width of a rolled piece is controlled by adopting an angle rolling mode, the broadening amount is related to the rotation angle and pass reduction of two passes, and the greater the rotation angle is, the greater the reduction is, the greater the broadening amount is. The rotation angle represents a ratio of the reduction in the thickness direction to the broadening in the width direction.
The invention provides a method for reasonably controlling the turning angle and the reduction of two passes by adopting a two-pass combined angular rolling mode, which aims to solve the problem of lower production efficiency when a small-broadening-ratio medium plate product is produced by conventional broadening rolling, and realizes a regulation distribution method of full load of a rolling mill while ensuring to reach the target width of a finished product so as to improve the production efficiency of the rolling mill.
Disclosure of Invention
The invention provides a regulation distribution method for the angle rolling full load of a heavy and medium plate mill aiming at the production of a heavy and medium plate product with a small spread ratio, and particularly relates to a regulation distribution method for the full load production of a mill by adopting a two-pass combined angle rolling mode, reasonably controlling the turning angle and the rolling reduction of two passes.
The technical scheme of the invention is as follows:
calculating the stretching reduction according to the sizes of the medium plate blank and the finished product; comparing the broadening rolling reduction with a lower limit value of pass rolling reduction, and if the broadening rolling reduction is smaller than the lower limit value of the pass rolling reduction, judging that a group of two-pass angle rolling regulations are adopted; determining the reduction of the angular rolling pass full load rolling according to the pass reduction upper limit value, and calculating the reduction of two angular rolling passes; calculating the width-to-width ratio by using the width value of the blank and the width value of the finished product; obtaining the reduction rate and corner data matched with two passes with different aspect ratios through finite element simulation to obtain a regression model; substituting the target spread width ratio and the target reduction ratios of the two angular rolling passes into a regression model, and respectively calculating to obtain the corners of the two passes; and rolling the blank by adopting the target reduction rate and the calculated corner in two corner rolling passes to obtain the target width of the finished product. The method is realized in the following specific mode:
(1) calculation of the amount of draw-down
And setting the sizes of the medium plate blank as thickness H, width W and length L, and the sizes of the finished steel plate as thickness H, width W and length L. Adopting a conventional transverse and longitudinal rolling mode, firstly rotating the steel, widening and rolling along the width W direction of the blank, and widening the target thickness h of each passwCalculating the formula (1):
rolling reduction delta h of widening passwCalculating the formula (2):
△hw＝H-hw (2)
(2) angle rolling input judgment
Setting the limiting value of the pass rolling reduction as delta hlimitThe lower limit value of the amplitude limiting coefficient of the pass reduction is alphamin。
If the rolling reduction delta h of the widening passwIf the limiting condition of the formula (3) is satisfied, judging that the pass load is insufficient, and adopting an angle rolling rule. If the range of the formula (3) is exceeded, the production is carried out by adopting a conventional transverse and longitudinal rolling mode with 90-degree rotation.
△hw<αmin·△hlimit (3)
(3) Calculation of full load reduction of angle rolling
And (4) putting a group of two-pass angle rolling to ensure the two-pass angle rolling full load rolling. In the angle rolling input pass, the billet temperature is high at the initial stage after the billet is discharged from the furnace, and the reduction is used as a limiting condition for load distribution. Limiting value Deltah according to the reductionlimitUpper limit value alpha of limiting coefficient of sum pass reductionmaxDetermining the rolling reduction delta h of the full load rolling of the angular rolling passangleCalculated as formula (4):
△hangle＝αmax·△hlimit (4)
respectively calculating the reduction ratios of two angular rolling passes:
(4) angle rolling spread-width ratio calculation
The angle rolling needs to meet the target requirement of the width of the finished product, and the target width-to-width ratio br is calculated according to the width W of the blank and the width W of the finished productwCalculated as formula (7):
(5) and (3) obtaining the reduction rate and corner data of two passes matched with different target spreading width ratios through finite element simulation software simulation calculation, and regressing to obtain a regression model of the secondary corners of the two secondary angle rolling passes by taking the target spreading width ratios and the pass reduction rates as independent variables.
1 st pass corner regression model:
angle1＝f1(brw,reduction1) (8)
and 2, a pass corner regression model:
angle2＝f2(brw,reduction2) (9)
(6) aspect ratio br of the objectwTarget reduction of two angular passes1And reduction2Substituting the formula (8) and the formula (9) to respectively calculate the rotation angle of two passes1And angle2。
(7) And (3) performing angle rolling by adopting the regulation distribution of two passes of full load: reduction of pass 11And a corner angle1(ii) a Pass 2 reduction2And a corner angle2And obtaining the target width w of the finished product.
The invention has the beneficial effects that: the invention provides a regulation distribution method for the angle rolling full load of a medium plate mill aiming at the production of medium plate products with small spread ratio. The problems that the conventional widening rolling method cannot give full play to equipment capacity and affects production efficiency are solved.
Drawings
FIG. 1 is a schematic diagram of conventional transverse and longitudinal rolling of a medium plate according to the present invention.
FIG. 2 is a schematic view of the angle rolling of a medium plate according to the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Examples
A full load regulation distribution method for the angle rolling of a heavy and medium plate mill comprises the following steps:
the method is applied to a single-stand wide and thick plate rolling mill, and the equipment parameters of the rolling mill are shown in a table 1.
TABLE 1 wide and thick plate mill parameter table
The slab stock and finished dimensions are shown in table 2.
TABLE 2 rolled piece basic information data sheet
(1) Calculation of the amount of draw-down
Adopting a conventional transverse and longitudinal rolling mode to widen the target thickness h of a passwAccording to formula (1):
rolling reduction delta h of widening passwAccording to formula (2):
△hw＝H-hw＝260-248.18＝11.82mm
(2) angle rolling input judgment
Pass reduction limit value delta hlimitTaking 35mm, and taking the lower limit value alpha of the limiting coefficient of pass reductionminTake 0.4, alphamin·△hlimit0.4 × 35-14 mm. According to formula (3): delta hw<αmin·△hlimitAnd judging, adopting conventional rolling, having insufficient pass load, and adopting an angle rolling rule.
(3) Calculation of full load reduction of angle rolling
Calculating the reduction of the angle rolling pass full load rolling and the upper limit value alpha of the pass reduction amplitude limiting coefficient according to the formula (4)maxTake 0.9,. DELTA.hangle＝αmax·△hlimit＝0.9×35＝31.5mm。
Respectively calculating the reduction ratios of two angular rolling passes according to formulas (5) and (6)
(4) Angle rolling spread-width ratio calculation
Calculating the target aspect ratio according to the formula (7)
(5) And (3) calculating the reduction rate and the corner data of two pass matching of different target aspect ratios by adopting finite element simulation software Deform simulation. The results of the simulation calculations are shown in table 3.
TABLE 3 Angle Rolling simulation calculation results
And (4) obtaining a regression model of the secondary angles of the two secondary angle rolling channels by regression, wherein the target spreading ratio and the pass reduction rate are used as independent variables.
1 st pass corner regression model:
angle1＝f1(brw,reduction1)
＝a0+a1·brw+a2·reduction1+a3·brw 2+a4·reduction1 2+a5·brw·reduction1
wherein: a is0＝24.68108；a1＝5.99254；a2＝-2.30777；a3＝-0.09127；a4＝0.07535；a5＝-0.15502；
And 2, a pass corner regression model:
angle2＝f2(brw,reduction2)
＝b0+b1·brw+b2·reduction1+b3·brw 2+b4·reduction1 2+b5·brw·reduction1
wherein: b0＝22.48009；b1＝4.36083；b2＝-1.75286；b3＝-0.11348；b4＝0.03986；b5＝-0.08234；
(6) Aspect ratio br of the objectwTarget reduction of 4.76% and two angular passes1＝12.12％；reduction2The rotation angle of two passes is calculated by substituting the formula (8) and the formula (9) as 13.79 percent: angle1＝25.29°，angle2＝18.67°。
(7) And (3) performing angle rolling by adopting the regulation distribution of two passes of full load: the reduction rate of the 1 st pass is 12.12 percent, and the angle of rotation is 25.29 degrees; the 2 nd pass reduction is 13.79 percent and the corner is 18.67 degrees, so that the target width of the finished product is 2200 mm.
And (3) comparing application effects:
if the first two pass regulations of the product produced by the conventional transverse and longitudinal rolling mode are shown in the table 4, the pass regulations of the angle rolling full load regulation distribution method are shown in the table 5. It can be seen that, by adopting the conventional transverse and longitudinal rolling mode, in order to obtain the required target width, two steel turning operations with the turning angle of 90 degrees are required, and after the two rolling operations are finished, the width reaches the target width of 2200 mm. Because the target width is realized secondarily in the first pass, full-load rolling cannot be realized, and the thickness of the rolled piece after two passes only reaches 216.68 mm. If the angle rolling full load regulation distribution method is adopted, only two times of steel turning with the turning angles of 25.29 degrees and 18.67 degrees are needed. Full load distribution can be adopted for the reduction of the two passes, after the two passes of rolling are finished, the width reaches 2200mm of target width, the thickness of the rolled piece reaches 197.00mm, and the reduction of 19.68mm is increased compared with the conventional rolling mode.
TABLE 4 load distribution pass schedule for conventional rolling
TABLE 5 procedure for distributing the method of pass through the angular rolling full load procedure
Claims (7)
1. A full load regulation distribution method for the angle rolling of a heavy and medium plate mill is characterized in that the broadening rolling reduction is calculated according to the sizes of a heavy and medium plate blank and a finished product; comparing the broadening rolling reduction with a lower limit value of pass rolling reduction, and if the broadening rolling reduction is smaller than the lower limit value of the pass rolling reduction, judging that a group of two-pass angle rolling regulations are adopted; determining the reduction of the angular rolling pass full load rolling according to the pass reduction upper limit value, and calculating the reduction of two angular rolling passes; calculating the width-to-width ratio by using the width value of the blank and the width value of the finished product; obtaining the reduction rate and corner data matched with two passes with different aspect ratios through finite element simulation to obtain a regression model; substituting the target spread width ratio and the target reduction ratios of the two angular rolling passes into a regression model, and respectively calculating to obtain the corners of the two passes; and rolling the blank by adopting the target reduction rate and the calculated corner in two corner rolling passes to obtain the target width of the finished product.
2. The method for distributing the full load regulation of the angle rolling of the heavy and medium plate mill as claimed in claim 1, comprising the steps of:
(1) calculation of the amount of draw-down
Setting the blank size of the medium plate as thickness H, width W and length L, the size of the steel plate for producing finished products as thickness H, width W and length L, adopting a conventional transverse and longitudinal rolling mode, firstly rotating the steel, carrying out broadening rolling along the width W direction of the blank, and calculating the reduction delta H of broadening passw；
(2) Angle rolling input judgment
Setting the limiting value of the pass rolling reduction as delta hlimitThe lower limit value of the amplitude limiting coefficient of the pass reduction is alphaminIf the rolling reduction Δ h is widened in the passwIf the limiting condition of the formula (3) is satisfied, judging that the pass load is insufficient, and adopting an angle rolling gaugeA process; if the range of the formula (3) is exceeded, the conventional 90-degree rotation and transverse and longitudinal rolling mode is adopted for production;
△hw<αmin·△hlimit (3)
(3) calculation of full load reduction of angle rolling
Limiting value Deltah according to the reductionlimitUpper limit value alpha of limiting coefficient of sum pass reductionmaxDetermining the rolling reduction delta h of the full load rolling of the angular rolling passangleRespectively calculating the reduction ratios of two angular rolling passes1And reduction2；
(4) Angle rolling spread-width ratio calculation
Calculating a target aspect ratio br according to the blank width W and the finished product width Ww；
(5) Obtaining the reduction rate and corner data of two passes matched with different target spreading width ratios through finite element simulation software simulation calculation, and regressing to obtain a regression model of the secondary corners of the two secondary angle rolling passes by taking the target spreading width ratios and the pass reduction rates as independent variables;
(6) aspect ratio br of the objectwTarget reduction of two angular passes1And reduction2Substituting the regression model in the formula step (5) to respectively calculate the corner angle of two passes1And angle2；
(7) And (3) performing angle rolling by adopting the regulation distribution of two passes of full load: reduction of pass 11And a corner angle1(ii) a Pass 2 reduction2And a corner angle2And obtaining the target width w of the finished product.
3. The method for distributing the full load regulation of the angle rolling of the heavy and medium plate mill as claimed in claim 2, wherein in the step (1), the target thickness h of the widening passwCalculating the formula (1):
widening passReduction amount Δ hwCalculating the formula (2):
△hw＝H-hw (2)。
4. the distribution method for the full load regulation of the angle rolling of the heavy and medium plate mill as claimed in claim 2, wherein in the step (3), the reduction Δ h of the full load rolling of the angle rolling passangleCalculating as formula (4):
△hangle＝αmax·△hlimit (4)。
5. the distribution method for the full load schedule of the heavy and medium plate mill angle rolling according to claim 2, wherein in the step (3), the reduction ratios of two angle rolling passes are adopted1、reduction2The calculation formula is as follows:
6. the method for distributing the full load schedule of the heavy and medium plate mill of claim 2, wherein in the step (4), the target aspect ratio brwCalculating as formula (7):
7. the distribution method for the full load regulation of the angle rolling of the heavy and medium plate mill as claimed in claim 2, wherein in the step (5), the regression model of the secondary angle of the two secondary angular rolling passes with the target spread ratio and the pass reduction as independent variables is as follows:
1 st pass corner regression model:
angle1＝f1(brw,reduction1) (8)
and 2, a pass corner regression model:
angle2＝f2(brw,reduction2) (9)。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114247757A (en) * | 2021-12-02 | 2022-03-29 | 北京科技大学设计研究院有限公司 | Control method for automatic steel rotation of wide and thick plate rolling line |
| CN114632817A (en) * | 2022-02-22 | 2022-06-17 | 南京钢铁股份有限公司 | Rolling method of wide and thick plate rolling mill |
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