阅读说明：本技术 一种热轧带钢的首轧制宽度控制方法 (First rolling width control method of hot-rolled strip steel ) 是由 余金鹏 谭耘宇 葛晓 陈黎骏 赖森贞 周心富 于 2018-06-28 设计创作，主要内容包括：本发明涉及一种热轧带钢的首轧制宽度控制方法,主要解决现有热轧带钢宽度在首次轧制时宽度经常窄的技术问题。本发明方法包括以下步骤：S1、设置首次轧制分类库和宽度补偿表,S2、判断产品是否是首次轧制；S3、计算产品首次轧制宽度；S4、动态修正首次轧制后带钢宽度控制,确保连续性。本发明方法通过提高热轧带钢首次轧制时的宽度控制精度来满足产品宽度的要求。(The invention relates to a first rolling width control method of hot-rolled strip steel, which mainly solves the technical problem that the width of the existing hot-rolled strip steel is often narrow when the hot-rolled strip steel is rolled for the first time. The method comprises the following steps: s1, setting a primary rolling classification library and a width compensation table, and S2, judging whether the product is primary rolled; s3, calculating the first rolling width of the product; and S4, dynamically correcting the width control of the strip steel after the first rolling to ensure the continuity. The method of the invention meets the requirement of the product width by improving the width control precision when the hot-rolled strip steel is rolled for the first time.)

1. A first rolling width control method of hot-rolled strip steel is characterized by comprising the following steps:

s1 setting a first rolling classification table and a width compensation table

The first rolling classification table records the steel type classification, rough rolling set width classification, and the like of all rolled hot rolled strip steels,The thickness category and the decompression amount category of the rough rolling intermediate billet, and the width compensation table carries a width compensation value W₀And width compensation correction value M, width compensation value W₀The initial value of (2) is in the range of [0,5 ]]The initial value of the width compensation correction value M is 0; each rolled hot rolled strip steel corresponds to a strip steel width deviation;

s2, judging whether the product to be produced is rolled for the first time

If the classification items of the products to be produced are in the first rolling classification table, judging that the products are not first rolled, and rolling according to the corresponding existing process; otherwise, the product is firstly rolled, the classification items of the product are stored in a first rolling classification table, and the step is switched to the step S3; the classification entry includes: the steel type category, the rough rolling set width category, the rough rolling intermediate blank thickness category and the pressure reduction amount category;

s3, calculating the target width of the first rolled first strip steel of the product, and specifically comprising the following steps:

s31, finding the first unmatched class of the product to be produced according to the sequence of the steel type class, the rough rolling set width class, the rough rolling intermediate billet thickness class and the pressure reduction class;

s32, if the steel grades are matched, the steel grade type deviation value K1= 0; if the steel types are not matched, gradually increasing the steel type by 1 and decreasing the steel type by 1, checking whether the other three types are matched, and if so, recording a steel type deviation value K1 and a corresponding strip steel width deviation W1; if the steel type is not matched after being reduced to 0, recording a steel type deviation value K1 corresponding to the steel type 0 and a corresponding strip steel width deviation W1;

s33, according to the same method of the step s32, searching the width type variation K2 and the corresponding strip steel width deviation W2, the thickness type variation K3 and the corresponding strip steel width deviation W3; the decompression amount type variation K4 and the corresponding strip steel width deviation W4;

s34 calculating the first rolling width control value W by the formula (1)_effect

W_effect=W₀ +（W₁*X₁ + W₂*X₂+ W₃*X₃+ W₄*X₄） （1）

In the formula (1), W₀For the width compensation value, read from the width compensation table, X_i =a_i ^ki，i=1,2,3,4；a₁The value range of (A) is 0.75-0.85; a is₂The value range of (A) is 0.65-0.75; a is₃The value range of (1) is 0.55-0.65; a is₄The range of (1) is 0.45-0.55;

the first rolling width control value W obtained by calculation_effectAssigning a width compensation value to the first rolling classification table, i.e. W₀ =W_effect；

s35, calculating the target width W of rough rolling according to the formula (2)_RMTarget

W_RMTarget=W_FmTarget - W_FmSpread + W_inher + W_effect （2）

In the formula (2), W_FmTargetWidth of rolling for finish rolling, W_FmSpreadFor width of finish rolling, W_inherIs the model coefficient;

s4, dynamically correcting the first rolling width, and specifically comprising the following steps:

s41, calculating the deviation W between the actual width value and the target width value of the latest strip steel rolled firstly by using the formula (3)_FmError

W_FmError = W_FmAct - W_FmTarget （3）

Wherein: w_FmActFor the actual width of the finish rolling, W_FmTargetA rolling width of finish rolling;

s42, deviation W_FmErrorExceeding the process-defined tolerance range [ -W [ ]_max, W_max]If yes, go to step s43 to adjust the width compensation correction value, otherwise, not adjust the width compensation correction value;

s43, adjusting the width compensation correction value M in the width compensation table by the formula (4) or the formula (5),

when W is_FmError<At 0, M = W_FmError+W_max （4）

When W is_FmError>At 0, M = W_max-W_FmError （5）

s44, calculating the rough rolling target width of the next strip steel through a formula (6);

W_RMTarget=W_FmTarget - W_FmSpread + W_inher+ W₀ +M; （6）

s45, repeating the steps s41-s44 until the rough rolling target width calculation of the third strip steel is finished.

2. The first rolling width control method of a hot-rolled strip as claimed in claim 1, characterized in that: the initial value of the width compensation value is 5.

3. The first rolling width control method of a hot-rolled strip as claimed in claim 1, characterized in that: in step S2, if the product is not the first rolling, the target width of the rough rolling is calculated by the formula (7)

W_RMTarget=W_FmTarget - W_FmSpread + W_inh （7）

In the formula (7), W_inhThe genetic learning coefficient of the finish rolling of the same type of steel obtained by the strip steel is obtained, and the specific numerical value is the deviation of the rough rolling actual width and the finish rolling actual width of the previous strip steel.

4. The first rolling width control method of a hot-rolled strip as claimed in claim 1, characterized in that: in step s34, a₁=0.8；a₂=0.7；a₃=0.6；a₄=0.5。

5. The first rolling width control method of a hot-rolled strip as claimed in claim 3, characterized in that: after completion of step s45, the rough rolled target width is calculated using equation (7) from the fourth strip.

6. The first rolling width control method of a hot-rolled strip as claimed in claim 1, characterized in that: the steel type category is determined according to the material quality and the steel type characteristics of the strip steel; determining the rough rolling set width category according to the rough rolling target width value calculated by the model; determining the thickness category of the rough rolling intermediate billet according to an intermediate billet thickness classification table set by rough rolling; the category of the reduced pressure is determined according to the width of the finish rolling target and the width of the plate blank.

7. The first rolling width control method of a hot-rolled strip as claimed in claim 1, characterized in that: w_max=3。

8. The first rolling width control method of a hot-rolled strip as claimed in claim 1, characterized in that: model coefficient W_inherHas a value range of [0.9,1.18 ]]。

Technical Field

The invention relates to a control method for the rolling width of hot continuous rolling plate strip steel, in particular to the control of the width of a product during the first rolling, and belongs to the field of production control of hot continuous rolling rough rolling strip steel.

Background

The width control of the hot-rolled rough-rolled strip steel is an important index of the quality of hot-rolled products, and is directly related to the qualification of the hot-rolled products. In model control, there are many factors that affect the control of the width of rough rolled strip, including: the quality number of the strip steel, the steel tapping mark, the thickness of the rough rolling intermediate blank, the set width of rough rolling, the rolling reduction of the strip steel, the temperature of the strip steel, the dog bone widening, the natural widening and the like. When the width of the rough rolling model is calculated, the width needs to be compensated by short-time learning and long-time learning. The short-term learning refers to learning compensation among blocks in the same classification class, and the long-term learning refers to learning a plurality of pieces of strip steel of the same type and using the learning for the first block after plan change when plan change is carried out. All learning compensation is based on the fact that the same type of strip steel is subjected to learning rolling, and is well documented. When a new type of strip steel is rolled for the first time, although the principle of fuzzy matching and nearby learning exists, the rolling parameter attributes of the type of steel cannot be correctly reflected, and learning compensation is incorrect, so that the calculated target width of a rough rolling model has large deviation and the full length of the width is narrow.

The invention designs a compensation method aiming at the situation, writes the first rolling into a classification library by judging whether the field is rolled for the first time, creates a width compensation table, compensates the width by looking up the table in a corresponding mode, and solves the narrowing problem of the first rolling.

The Chinese patent application publication No. CN1959682A discloses a width optimization setting method for rough rolling strip steel, which comprises the following steps: the method comprises the steps of calculating the finish rolling natural width of the strip steel by adopting a short-time model or a long-time and short-time model combination method of the finish rolling natural width according to the change condition of the specification of the produced strip steel, dynamically determining the natural width allowance of the strip steel in finish rolling according to the prediction precision of the finish rolling natural width allowance and the actual control statistical precision of the hot rolling width, and determining the rough rolling width set value of the current strip steel according to the finish rolling natural width allowance and the width additional allowance. After the actual finish rolling natural broadening of the strip steel is obtained, the self-adaptive adjustment of parameters and the self-adaptive learning of the long-term model are carried out on the finish rolling natural broadening short-term model of the strip steel.

The Chinese patent application publication No. CN104415972A discloses a comprehensive self-adaptive control method for the width of rough rolling strip steel, which comprises the following steps: setting a calculation process of rough rolling width of the steel plate blank with the steel plate, performing self-adaptive calculation of a rough rolling width model, and storing and returning data of the inheritance of finish rolling natural spread learning and finish rolling width global learning. These genetic data will be used for the rough rolling setting calculation of the lower strip slab.

Said invention is aimed at learning and width control of rolled band steel, and does not refer to compensation and learning method in the first rolling process.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a method for controlling the first rolling width of hot rolled strip steel, so that the first three pieces of strip steel which are rolled for the first time can not be narrowed when the specification of the strip steel is changed, and the stability of subsequent rolling is realized.

In order to solve the technical problems, the first rolling width control method of the hot-rolled strip steel provided by the invention is characterized by comprising the following steps of:

s1 setting a first rolling classification table and a width compensation table

The first rolling classification table records the steel type category, the rough rolling set width category, the rough rolling intermediate blank thickness category and the pressure reduction amount category of all rolled hot rolled strip steel, and the width compensation table records the width compensation value W₀And width compensation correction value M, width compensation value W₀The initial value of (2) is in the range of [0,5 ]]The initial value of the width compensation correction value M is 0; each rolled hot rolled strip steel corresponds to a strip steel width deviation;

s2, judging whether the product to be produced is rolled for the first time

If the classification items of the products to be produced are in the first rolling classification table, judging that the products are not first rolled, and rolling according to the corresponding existing process; otherwise, the product is firstly rolled, the classification items of the product are stored in a first rolling classification table, and the step is switched to the step S3; the classification entry includes: the steel type category, the rough rolling set width category, the rough rolling intermediate blank thickness category and the pressure reduction amount category;

s3, calculating the target width of the first rolled first strip steel of the product, and specifically comprising the following steps:

s31, finding the first unmatched class of the product to be produced according to the sequence of the steel type class, the rough rolling set width class, the rough rolling intermediate billet thickness class and the pressure reduction class;

s32, if the steel grades are matched, the steel grade type deviation value K1 is 0; if the steel types are not matched, gradually increasing the steel type by 1 and decreasing the steel type by 1, checking whether the other three types are matched, and if so, recording a steel type deviation value K1 and a corresponding strip steel width deviation W1; if the steel type is not matched after being reduced to 0, recording a steel type deviation value K1 corresponding to the steel type 0 and a corresponding strip steel width deviation W1;

s33, according to the same method of the step s32, searching the width type variation K2 and the corresponding strip steel width deviation W2, the thickness type variation K3 and the corresponding strip steel width deviation W3; the decompression amount type variation K4 and the corresponding strip steel width deviation W4;

s34 calculating the first rolling width control value W by the formula (1)_effect

W_effect＝W₀+(W₁*X₁+W₂*X₂+W₃*X₃+W₄*X₄) (1)

In the formula (1), W₀For the width compensation value, read from the width compensation table, X_i＝a_i ^ki，i＝1,2,3,4；a₁The value range of (A) is 0.75-0.85; a is₂The value range of (A) is 0.65-0.75; a is₃The value range of (1) is 0.55-0.65; a is₄The range of (1) is 0.45-0.55;

the first rolling width control value W obtained by calculation_effectAssigning a width compensation value to the first rolling classification table, i.e. W₀＝W_effect；

s35, calculating the target width W of rough rolling according to the formula (2)_RMTarget

W_RMTarget＝W_FmTarget-W_FmSpread+W_inher+W_effect (2)

In the formula (1), W_FmTargetWidth of rolling for finish rolling, W_FmSpreadFor finish rollingWidth of (W)_inherThe model coefficient is in a range of 0.9-1.18, and the specific numerical value is the deviation of a finish rolling actual value and a finish rolling actual value after the previous strip steel is rolled, and belongs to known parameters in the method;

s4, dynamically correcting the first rolling width, and specifically comprising the following steps:

s41, calculating the deviation W between the actual width value and the target width value of the latest strip steel rolled firstly by using the formula (3)_FmError

W_FmError＝W_FmAct-W_FmTarget (3)

Wherein: w_FmActFor the actual width of the finish rolling, W_FmTargetA rolling width of finish rolling;

s42, deviation W_FmErrorExceeds the deviation range of the process limit [ -W ]_max,W_max]If yes, go to step s43 to adjust the width compensation correction value, otherwise, not adjust the width compensation correction value;

s43, adjusting the width compensation correction value M in the width compensation table by the formula (4) or the formula (5),

when W is_FmError<When 0, M ═ W_FmError+W_max (4)

When W is_FmError>When 0, M ═ W_max-W_FmError (5)

s44, calculating the rough rolling target width of the next strip steel through a formula (6);

W_RMTarget＝W_FmTarget-W_FmSpread+W_inher+W₀+M； (6)

s45, repeating the steps s41-s44 until the rough rolling target width calculation of the third strip steel is finished.

Compared with the prior art, the invention has the following positive effects:

1. the invention can judge whether the specification is changed and then rolled for the first time in real time according to the field requirement and determine whether compensation is carried out.

2. The invention calculates the width compensation and the corresponding set value during the first rolling.

3. The invention carries out smooth transition on continuous production after first rolling by a novel model self-learning method.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the embodiments of the present invention in conjunction with the technical solutions.

The first rolling width control method of the hot-rolled strip steel of the embodiment of the invention comprises the following steps:

s1 setting a first rolling classification table and a width compensation table

The first rolling classification table records the steel type category, the rough rolling set width category, the rough rolling intermediate blank thickness category and the pressure reduction amount category of all rolled hot rolled strip steel, and the width compensation table records the width compensation value W₀And width compensation correction value M, width compensation value W₀The initial value of (2) is in the range of [0,5 ]]In this example, the width compensation value W₀Taking 5; the initial value of the width compensation correction value M is 0; each rolled hot rolled strip corresponds to a strip spread deviation, which can also be listed in table 1 for easy searching.

First rolling classification table

Class of steel	Rough rolling set width class	Thickness classification of rough rolled intermediate slab	Class of amount of reduced pressure
				0	0	0	0
1	3	2	1
				2	4	2	1
3	4	3	1

The classification of the steel type, the classification of the rough rolling set width, the classification of the rough rolling intermediate billet thickness and the classification of the pressure reduction amount are classified according to the existing classification method. The steel type category is determined according to the material quality and the steel type characteristics of the strip steel; determining the rough rolling set width category according to the rough rolling target width value calculated by the model; determining the thickness category of the rough rolling intermediate billet according to an intermediate billet thickness classification table set by rough rolling; the category of the reduced pressure is determined according to the width of the finish rolling target and the width of the plate blank.

Width compensation meter

Width compensation value W0	Width compensation correction value M
		5	0

S2, judging whether the product to be produced is rolled for the first time

If the classification items of the products to be produced are in the first rolling classification table, judging that the products are not first rolled, and rolling according to the corresponding existing process. Namely, the target width W of the rough rolling is calculated by the formula (7)_RMTarget

W_RMTarget＝W_FmTarget-W_FmSpread+W_inh (7)

W_FmTargetThe rolling width for finish rolling, which is a known quantity, is issued by the ERP system directly in a planned manner to the hot rolling production module, W_FmSpreadThe width for finish rolling is calculated from the existing hot-rolling rough-rolling model, wherein in formula (7), W_inhThe genetic learning coefficient of the finish rolling of the same type of steel obtained by the strip steel is obtained, the specific numerical value is the deviation of the rough rolling actual value and the finish rolling actual value after the previous strip steel (the strip steel produced in the last time of the existing product in the table) is rolled, and the genetic coefficient is obtained in the prior art and belongs to the known parameters in the method.

If the classification item of the product to be produced is not in the first rolling classification table, the product is first rolled, the classification item of the product is stored in the first rolling classification table, and the step S3 is switched to; the classification entries include: steel type category, rough rolling set width category, rough rolling intermediate billet thickness category and pressure reduction amount category.

In this example, the classification entries of the products to be produced are as follows:

class of steel	Rough rolling set width class	Thickness classification of rough rolled intermediate slab	Class of amount of reduced pressure
				1	4	3	1

If the classification item is not in the first rolling classification table, the product is judged to be first rolled.

S3, calculating the target width of the first rolled first strip steel of the product, and specifically comprising the following steps:

s31, finding the first unmatched class of the product to be produced according to the sequence of the steel type class, the rough rolling set width class, the rough rolling intermediate billet thickness class and the pressure reduction quantity class. The rough rolling set width category, the rough rolling intermediate billet thickness category and the pressure reduction amount category are used as known conditions, and the matched items are found by searching in a table, but the steel type category does not have the matched items, so that the first unmatched steel type is the steel type category.

s32, if the steel grades are matched, the steel grade type deviation value K1 is 0; if the steel types are not matched, gradually increasing the steel type by 1 and decreasing the steel type by 1, checking whether the other three types are matched, and if so, recording a steel type deviation value K1 and a corresponding strip steel width deviation W1; if the steel type is not matched after being reduced to 0, recording the steel type deviation K1 corresponding to the steel type 0 and the corresponding strip steel width deviation W1.

In this example, the rough rolling set width type, the rough rolling intermediate slab thickness type, and the reduction amount type are looked up in a table as known conditions, and it is found that the first steel type is 1 and there is no matching item, so the first rolled steel type is increased by 1, the first rolled steel type is found not to match the second row, and the first rolled steel type is increased by 1 and then matched, so K1 is 2, and the W1 corresponds to the band width spread deviation of the keyword of the type 3, 4, 3, 1, and the band width spread deviation is obtained by looking up the table, where W1 is 0.9.

s33, according to the same method of the step s32, searching the width type variation K2 and the corresponding strip steel width deviation W2, the thickness type variation K3 and the corresponding strip steel width deviation W3; and the decompression amount type variation K4 and the corresponding strip steel width deviation W4.

The final calculation yields K2 ═ 1, W2 ═ 1, K3 ═ 2, W3 ═ 1.2, K4 ═ 0, and W4 ═ 0.8.

s34 calculating the first rolling width control value W by the formula (1)_effect

W_effect＝W₀+(W₁*X₁+W₂*X₂+W₃*X₃+W₄*X₄) (1)

In the formula (1), W₀For the width compensation value, read from the width compensation table, X_i＝a_i ^ki，i＝1,2,3,4；a₁The value range of (A) is 0.75-0.85; a is₂The value range of (A) is 0.65-0.75; a is₃The value range of (1) is 0.55-0.65; a is₄The range of (1) is 0.45 to 0.55. In this example, a₁＝0.8；a₂＝0.7；a₃＝0.6；a₄＝0.5。

Calculating to obtain W_effect＝5+(0.9*0.8²+1*0.7¹+1.2*0.6²+0.8*0.5⁰)＝7.508

The first rolling width control value W obtained by calculation_effectAssigning a width compensation value to the first rolling classification table, i.e. W₀＝W_effect. The updated width compensation table is as follows:

width compensation value W0	Width compensation correction value M
		7.508	0

s35, calculating the target width W of rough rolling according to the formula (2)_RMTarget

W_RMTarget＝W_FmTarget-W_FmSpread+W_inher+W_effect (2)

W_inherIs a model coefficient in the range of 0.9-1.18, W in this example_inherThe value was 1.04. Calculating the target width W of rough rolling_{RMTarget t}＝1240.8。

And applying the rough rolling target width obtained by calculation to the production of first rolling the first strip steel.

S4, dynamically correcting the first rolling width, and specifically comprising the following steps:

s41, calculating the deviation W between the actual width value and the target width value of the latest strip steel rolled firstly by using the formula (3)_FmError

W_FmError＝W_FmAct-W_FmTarget (3)

Wherein: w_FmActFor the actual width of the finish rolling, W_FmTargetThe rolling width of the finish rolling, which is a known quantity, is directly issued to the hot rolling production module by the ERP system in a planned manner.

s42, deviation W_FmErrorExceeds the deviation range of the process limit [ -W ]_max,W_max]Then go to step s43 to adjust the width compensation correction value, otherwise, without adjusting the width compensation correction value, the width compensation is performed by taking the width correction value of the first block rolling, i.e. W_effectThe same as the first block.

The range of deviation in this example is [ -3,3]. Deviation W after rolling of the first strip_FmError4. If the deviation range defined by the process is exceeded, the process goes to step s 43.

s43, the width compensation correction value M in the width compensation table is adjusted by equation (4) or equation (5), and written in the width compensation table.

When W is_FmError<When 0, M ═ W_FmError+W_max (4)

When W is_FmError>When 0, M ═ W_max-W_FmError (5)

In this example, W_FmError＝4>0, then M is 3-W_FmError＝-1

The updated width compensation table is as follows:

width compensation value W0	Width compensation correction value M
		7.508	-1

s44, calculating the rough rolling target width of the next strip steel through a formula (6);

W_RMTarget＝W_FmTarget-W_FmSpread+W_inher+W₀+M； (6)

and rolling the next strip steel according to the calculated rough rolling target width.

s45, repeating the steps s41-s44 until the rough rolling target width calculation of the third strip steel is finished.

After completion of step s45, the rough rolled target width is calculated using equation (7) from the fourth strip.

W_RMTarget＝W_FmTarget-W_FmSpread+W_inh (7)

At this time, the compensation values of the first three strips are calculated to the target width of rough rolling by the formula (6), and finally rolling is performed according to the calculated target width of rough rolling, and after the rolling of the strips is completed, the obtained actual width of finish rolling reflects the final width obtained by compensation. And when the fourth strip steel is rolled, the required genetic learning data can be obtained only by comparing the final actual width with the target width. W_inhThe deviation between the rough rolling actual width and the finish rolling actual width of the third strip steel is rolled first (the deviation between the rough rolling actual width and the finish rolling actual width of the previous strip steel).

Comparative data for the first rolled product of the two cases are listed below to demonstrate the effectiveness of the process of the present invention.

Case one

First rolling of a hot rolled plum steel 1780 line rolled strip 78167703300 (coil number)

Steel grade classification: 01

Thickness classification of rough rolling intermediate blank: 3

Rough rolling target width classification: 4

Class of amount of width reduction: 1

And (3) performing finish rolling and widening: -7.07mm

When no compensation is performed, the target width of the finish rolling outlet: 1216.344mm

When no compensation is performed, the rough rolling outlet target width: 1240.8mm

When compensation is not carried out, the actual target width of finish rolling is estimated as follows: 1212.901mm or so, 4mm narrow.

After the actual rolling by the present invention, the width data of the strip steel is as follows:

after compensation, finish rolling outlet target width: 1221.07mm

After compensation, the rough rolling outlet target width: 1246.32mm

After compensation, the actual width of the finish rolling outlet: 1221.138mm

The width curve is slightly normal and not narrow.

And the subsequent rolling of a second strip steel 78167703400 is carried out, the width is learned, and the width is controlled as follows:

and (3) performing finish rolling and widening: -6.2mm

When no compensation is performed, the target width of the finish rolling outlet: 1215.894mm

When no compensation is performed, the rough rolling outlet target width: 1241.3mm

When compensation is not carried out, the actual target width of finish rolling is estimated as follows: 1212.701mm or so, and 3mm narrow.

After the actual rolling by the present invention, the width data of the strip steel is as follows:

after compensation, finish rolling outlet target width: 1219.34mm

After compensation, the rough rolling outlet target width: 1245.851mm

After compensation, the actual width of the finish rolling outlet: 1220.138mm

The width curve is slightly normal and is not narrow within the allowable control range

And a third subsequent strip steel 78167900200 is rolled, the width is learned, and the width is controlled as follows:

and (3) performing finish rolling and widening: -5.9mm

When no compensation is performed, the target width of the finish rolling outlet: 1216.015mm

When no compensation is performed, the rough rolling outlet target width: 1241.1mm

When compensation is not carried out, the actual target width of finish rolling is estimated as follows: 1213.97mm or so, and 2.1mm narrow.

After the actual rolling by the present invention, the width data of the strip steel is as follows:

after compensation, finish rolling outlet target width: 1219.76mm

After compensation, the rough rolling outlet target width: 1244.31mm

After compensation, the actual width of the finish rolling outlet: 1219.96mm

The width curve is somewhat normal and not narrow within the allowable control range.

Case two:

first rolling of a hot rolled plum steel 1780 line rolled strip 61866700500 (coil number)

Steel grade classification: 3004

Thickness classification of rough rolling intermediate blank: 15

Rough rolling target width classification: 4

Class of amount of width reduction: 5

And (3) performing finish rolling and widening: -10.01mm

By virtual calculation, when no compensation is performed:

when no compensation is performed, the target width of the finish rolling outlet: 1264.865mm

When no compensation is performed, the rough rolling outlet target width: 1280.99mm

When compensation is not carried out, the actual target width of finish rolling is estimated as follows: 1262mm or so, and is narrow.

After the actual rolling by the present invention, the width data of the strip steel is as follows:

after compensation, finish rolling outlet target width: 1268.865mm

After compensation, the actual width of the finish rolling outlet: 1272.138mm

After compensation, the rough rolling outlet target width: 1284.851mm

The width curve is slightly wider, but not narrower within the allowable control range.

And the subsequent rolling of a second strip steel 62241702300 is carried out, the width is learned, and the width is controlled as follows:

after continuous learning, finish rolling the exit target width: 1266.865mm

After continuous learning, rough rolling exit target width: 1282.99mm

After continuous learning, the actual width of the finish rolling outlet: 1270.495mm

The width curve is normal and not narrow.

And a third subsequent strip steel 62241800100 is rolled, the width is learned, and the width is controlled as follows:

after continuous learning, finish rolling the exit target width: 1267.179mm

After continuous learning, rough rolling exit target width: 1283.06mm

After continuous learning, the actual width of the finish rolling outlet: 1269.62mm

The width curve is normal and not narrow.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.