CN108994086B - Strip steel width feedback correction method - Google Patents

Abstract

A strip width feedback correction method and system provided by the embodiment of the present invention, in view of the width control scheme of the prior art, the present invention specifically obtains the target width of the nth pass of the current strip steel block in the product processing process. , the pass correction value of the n‑1th pass, and the interblock correction value of the nth pass with the previous steel block. Then, according to the obtained target width of the nth pass of the current strip in the product processing process, the pass correction value of the n-1th pass, and the nth pass of the previous strip of the steel block Correction value between blocks to get the current width of the nth pass of the strip. The present invention comprehensively considers the progress parameters of the current strip steel block itself and the error relationship existing between the adjacent steel strip blocks, and finally obtains the use width data with higher precision.

Description

A strip width feedback correction method

technical field

The invention relates to the technical field of production control, in particular to a feedback correction method for strip width.

Background technique

In the hot-rolled strip production process, strip width control is mainly done in the rough rolling area. The main rolling equipment in the rough rolling area includes rough descaling machine, pressure setting machine, rough rolling mill, etc. The rough rolling mill consists of vertical rolling mill and horizontal rolling mill. Among them, the pressure setting machine and the vertical rolling mill have the ability to control the width, and the rolling phenomenon will appear after passing through the horizontal rolling mill. Rough rolling width control is the process of alternately controlling the widening process and the widening process to achieve the target width.

The rough rolling width control model mainly allocates the width control target to each pass of rolling according to the incoming material data and product data. The accuracy of the width model of each pass directly affects the accuracy of the width control. For example, the friction factor is introduced to improve the calculation accuracy of the calculation physical model; for another example, in the process of width self-learning, the acquisition process of the measured value is optimized, which improves the calculation accuracy of the self-learning coefficient; another example, the width of the incoming material is carried out. detection to reduce the impact of width fluctuations on the model, etc. However, in the width control model adopted above, when processing strips with the same processing requirements and specifications, only the parameters of the current strip to be processed are carried out, ignoring the difference between adjacent strips and the current strip. Due to the existing relationship, it is difficult to further improve the accuracy of the width control data for the current pass of the strip.

SUMMARY OF THE INVENTION

In view of this, the purpose of the embodiments of the present invention is to provide a strip width feedback correction method, which solves the problem of ignoring the gap between the adjacent strip and the current strip when processing the strip in the prior art. The existing link leads to the technical problem of lower accuracy of the width control data of the current pass of the strip.

Embodiments of the present invention are implemented as follows:

A strip width feedback correction method, which is applied to width control in the rolling process of strip steel, comprising: in the production process of products of the same specification, obtaining the nth pass of the current strip in the processing of the product. target width, the pass correction value of the n-1th pass of the current strip, and the inter-block correction value of the n-th pass of the previous strip; wherein, the n-th pass of the current strip The pass correction value of 1 pass represents the calculated width of the rolling production system model of the current strip after the n-1th pass and the measured width value of the current strip after the n-1th pass The first deviation of The second deviation of the measured width value of the strip after the nth pass; n is the number of passes for the width control calculation; according to the obtained nth pass of the current strip in the product processing process The target width of , the correction value of the n-1th pass of the current strip, and the correction value of the nth pass of the previous strip, to obtain the nth pass of the current strip. Use width.

Preferably, when the number of passes n is 1, the pass correction value of the 0th pass of the current steel strip is 0.

Preferably, according to the obtained target width of the nth pass of the current steel strip in the product processing process, the pass correction value of the n-1th pass of the current steel strip, and the above After the step of obtaining the use width of the nth pass of the steel strip with the inter-block correction value of the nth pass of the steel strip, the step further includes: updating the pass correction of the nth pass of the current strip of the steel block value, and/or update the interblock correction value for the nth pass of the current strip.

Preferably, the step of updating the pass correction value of the nth pass of the current steel strip specifically includes: acquiring the physical parameters of the current steel strip and the nth pass of the current strip of steel. The physical parameters of the current strip steel block include: thickness and width reduction; according to the obtained physical parameters of the current steel strip block, the nth pass of the current strip steel block The measured width value, the pass correction value of the n-1th pass of the current strip block, and the used width of the nth pass of the current strip block to obtain the nth pass of the current strip block times the correction value of the pass.

计算获取所述当前带钢块的第n道次的道次修正值；对于所述当前带钢块其中，c_p,new为第n道次的道次修正值；c_p,old为第n-1道次的道次修正值；w₀为第n道次的使用宽度；w^*为第n道次的实测宽度值；H为第n道次的带钢块厚度；Δw为第n道次的减宽量；β为平滑系数；H_m、W_m、ΔW_m分别为厚度系数、宽度系数、减宽量系数。Preferably, according to the obtained physical parameters of the current steel strip, the measured width value of the nth pass of the current steel strip, the width of the n-1th pass of the current strip The step correction value of the pass, and the use width of the nth pass of the current strip block, the steps of obtaining the pass correction value of the nth pass specifically include: according to the formula:

Calculate and obtain the pass correction value of the nth pass of the current strip block; for the current strip block, _cp,new is the pass correction value of the nth pass; _cp,old is the nth pass -1 pass correction value; w ₀ is the use width of the nth pass; w ^* is the measured width value of the nth pass; H is the strip thickness of the nth pass; Δw is the nth pass β is the smoothing coefficient; H _m , W _m , ΔW _m are the thickness coefficient, width coefficient, and widening coefficient, respectively.

Preferably, the step of updating the inter-block correction value of the nth pass of the current strip specifically includes: acquiring the measured width value of the nth pass of the current strip; The interblock correction value of the nth pass of the strip, the target width and the measured width value of the nth pass of the current strip, and the pass correction value of the nth pass of the current strip , obtain the inter-block correction value of the n-th pass of the current strip; after the step of updating the inter-block correction value of the n-th pass of the current strip, further comprising: changing the current The inter-block correction value of the n-th pass of the strip is stored and used for the next strip.

Preferably, the block-to-block correction value based on the nth pass of the previous strip steel block, the target width and the measured width value of the nth pass of the current strip steel block, and the current strip steel block The step of obtaining the correction value of the n-th pass of the current strip block, specifically includes: according to the formula: c _b,new =α·c _b,old +( 1-α)·(ww ^* -c _p,new ), calculate and obtain the inter-block correction value of the nth pass of the current strip; for the current strip, where w is the target of the nth pass Width, c _b,new is the inter-block correction value of the nth pass; c _b,old is the inter-block correction value of the nth pass with the previous steel block; c _p,new is the nth pass. Correction value; α represents the smoothing coefficient.

Preferably, the total number of rolling passes for each strip is 6 times, numbered 1-6 in sequence, wherein the rolling directions numbered 3 and 5 are opposite to the rolling directions numbered 1, 2, 4, and 6; The calculated passes are the passes numbered 1, 2, 4, and 6.

Preferably, the target width of the nth pass of the current strip steel block in the product processing process obtained from the said acquisition, the pass correction value of the n-1th pass, and the previous strip steel block No. The step of obtaining the use width of the nth pass of the current strip steel block specifically includes: according to w ₀ =wc _b,old -c _p,old , calculating and obtaining the current strip steel block with the correction value between blocks The use width of the nth pass; for the current strip, w ₀ is the use width of the nth pass; w is the target width of the nth pass; _cb,old is the first strip of the previous strip. The inter-block correction value of n passes; c _p,old is the pass correction value of the n-1th pass.

A strip width feedback correction system, which is applied to the width control in the rolling process of strip steel blocks, includes: a parameter acquisition module, which is used for acquiring the current strip steel blocks in the process of product processing during the production process of products of the same specification. The target width of the nth pass, the pass correction value of the n-1th pass, and the interblock correction value of the nth pass of the previous strip; wherein, the n-1th of the current strip The pass correction value of the pass represents the difference between the calculated width of the rolling production system model of the current strip after the n-1th pass and the measured width value of the current strip after the n-1th pass. Deviation; the inter-block correction value of the nth pass of the previous strip of steel ingots represents the calculated width of the rolling production system model of the previous strip of steel ingots after the nth pass and the width of the previous strip of steel ingots The deviation of the measured width value after the nth pass; n is the number of passes for the width control calculation; the width calculation module is used to obtain the nth pass of the current strip in the processing of the product according to the obtained The target width of the second pass, the pass correction value of the n-1th pass, and the inter-block correction value of the nth pass of the previous strip of steel block, obtain the use width of the nth pass of the current strip of steel block.

In a strip width feedback correction method according to an embodiment of the present invention, in the production process of a product of the same specification, the obtained target width of the nth pass of the current strip steel block in the product processing process, and the nth - The pass correction value of 1 pass is used for the calculation of the used width of the nth pass of the current strip, taking into account the deviation between the calculated width and the measured width of the current strip in the adjacent rolling passes; Combined with the inter-block correction value of the nth pass of the previous strip, it is used for the calculation of the use width of the nth pass of the current strip, taking into account the same rolling pass of the adjacent strip in the processing control system. The amount of deviation between the calculated width of the model and the measured width in the second time. Finally, the use width of the n-th pass of the current steel strip is obtained comprehensively; compared with the prior art, the use width of the current steel strip is compared with the independent consideration of the parameters of the current steel strip. The existing error of the steel block during the n-th pass rolling (the correction value between the n-th pass of the previous steel block) has been comprehensively considered, which further improves the accuracy of the current n-th pass. It also ensures the control accuracy of the entrance width of the strip in the subsequent processing passes.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a strip steel production line provided by a preferred embodiment of the present invention.

FIG. 2 is a method flow chart of one of the embodiments of a strip width feedback correction method provided by a preferred embodiment of the present invention.

FIG. 3 is a method flow chart of Embodiment 2 of a strip width feedback correction method provided by a preferred embodiment of the present invention.

FIG. 4 is a flow chart of a method of one of the specific implementations of step S21 in FIG. 3 .

FIG. 5 is a flow chart of the method of the second embodiment of step S21 in FIG. 3 .

FIG. 6 is a schematic diagram of functional modules of a strip width feedback correction system provided by a preferred embodiment.

Icons: 100-strip steel production line; 101-phosphor removal device; 102-pressure sizing machine; 103-first roughing mill; 104-vertical rolling mill; 105-second roughing mill; 106-first width gauge; 107 -Second width measuring instrument; 108-Production line; 300-Strip width feedback correction system; 301-Parameter acquisition module; 302-Used width calculation module.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

The strip steel production line 100 shown in FIG. 1 is not shown in its entirety, but only shows the parts related to the control of the present invention. The strip steel production line 100 is one of the schematic diagrams of the application scenarios of the present invention, and is only used to explain the present invention. For the purpose of understanding, it should not be taken as a limitation on the protection scope of the present invention.

Among them, in the rolling process of the strip steel block, in the order of the production line 108, the equipment installed here are the phosphorus removal device 101, the pressure setting machine 102, the first roughing mill 103, the first width measuring instrument 106, the second roughing device 101. Rolling mill 105 , vertical rolling mill 104 , second width gauge 107 . During the processing, the strip moves on the production line, and each time it passes through the first roughing mill 103 or the second roughing mill 105 can be recorded as a rolling process, while the first width gauge 106 or the second width gauge Each time the instrument 107 measures the width value of the rigid block, it is recorded as the actual measured width value, and the current rolling process is defined as a width control calculation pass, which is recorded as the nth pass.

In the present invention, if the process is simplified, one of the first roughing mill 103 and the second roughing mill 105 can be used, and the first width gauge 106 or the second width gauge 107 can be installed in the used roughing mill at the same time. On both sides of the roughing mill, only the first width gauge 106 or the second width gauge 107 can be installed on one side of the used roughing mill for measurement. Not limited.

The operation of each parameter of the above-mentioned production line can be controlled and adjusted through a rolling production system model.

Referring to FIG. 2 , it is a method flowchart of a strip width feedback correction method provided by a preferred embodiment of the present invention and applicable to the strip steel production line 100 scenario shown in FIG. 1 . The specific flow shown in FIG. 2 will be described in detail below.

Step S11: Obtain the target width of the nth pass of the current strip in the product processing process, the pass correction value of the n-1th pass of the current strip, and the last strip of the strip. Correction value between blocks for the nth pass.

Among them, the target width is the strip width value that has been set at the exit of rolling during the nth pass of the current strip (that is, the width value of the strip is to be obtained, as the next rolling process strip width value at the process inlet). The pass correction value of the n-1 th pass of the current strip represents the calculated width of the rolling production system model of the current strip after the n-1 pass and the current strip in the n-1 pass. The first deviation of the measured width value after n-1 passes; the measured width value can be measured by the first width gauge 106 or the second width gauge 107; the rolling production system model calculates the width as the rolling production system ( device) specific parameter values.

The block-to-block correction value of the nth pass of the previous strip of steel ingots represents the calculated width of the rolling production system model of the previous strip of steel ingots after the nth pass and the calculated width of the previous strip of steel ingots at the nth pass. The second deviation of the measured width value after the pass; n is the number of passes for the width control calculation.

The above-mentioned first deviation and second deviation are numerical values representing the degree of deviation, not necessarily the specific length value of the deviation, and the calculation (acquisition) methods of the first deviation and the second deviation may be different (as described below). c _b,old and c _p,old ).

Step S12: According to the obtained target width of the nth pass of the current strip steel block in the product processing process, the pass correction value of the n-1th pass, and the nth pass of the previous strip steel block The correction value between sub-blocks is used to obtain the use width of the nth pass of the current strip.

Wherein, the used width is the actual used parameter value obtained after the preset width of the current strip at the exit in the rolling production system model is corrected during the nth pass of the current strip (exit width ). At this time, the rolling production system model will calculate various control parameters based on the used width, and send them to the actuator to achieve high-precision width control.

The specific calculation method in step S12 may be: according to w ₀ =wc _b,old -c _p,old , calculate and obtain the use width of the nth pass of the current steel strip. For the current strip, w ₀ is the used width of the nth pass; w is the target width of the nth pass; _cb,old is the block correction value of the nth pass of the previous strip ; c _p,old is the pass correction value of the n-1th pass of the current strip.

It should be noted that in the calculation of the first pass, since there is no first width measuring instrument 106 before that, the actual measured width value of the current strip steel block is not measured, and no pass correction value is generated. The pass correction value is 0. That is, when the number of passes n is 1, the pass correction value of the 0th pass of the current strip is 0.

As shown in Figure 3, after step S12, it also includes:

Step S21 : updating the pass correction value of the nth pass of the current steel strip, and/or updating the interblock correction value of the nth pass of the current strip.

Wherein, the updated pass correction value of the nth pass of the current strip can be used for the calculation of the next pass (n+1 pass) of the current strip, and the calculation is stopped if there is no next pass ; Update the inter-block correction value of the nth pass of the current strip, which can be used for the calculation of the same pass (nth pass) of the next strip.

Specifically, as shown in FIG. 4 , in step S21, the specific method for updating the pass correction value of the nth pass of the current strip includes:

Step S211a: obtaining the physical parameters of the current steel strip, and the measured width value of the nth pass of the current steel strip; the physical parameters of the current steel strip include: thickness and width reduction;

The width reduction is: the reduction in the width of the strip in the rolling pass, which is equal to the width of the entrance of the strip minus the target width of the exit when the strip ends the pass.

Step S212a: According to the acquired physical parameters of the current steel strip, the measured width value of the nth pass of the current strip, and the pass of the n-1th pass of the current strip The correction value is combined with the use width of the nth pass of the current strip to obtain the pass correction value of the nth pass of the current strip.

Further, the specific calculation method of the step S212a may be:

计算获取所述当前带钢块的第n道次的道次修正值；对于所述当前带钢块,其中，c_p,new为第n道次的道次修正值；c_p,old为第n-1道次的道次修正值；w₀为第n道次的使用宽度；w^*为第n道次的实测宽度值；H为第n道次的带钢块厚度；Δw为第n道次的减宽量；β为平滑系数；H_m、W_m、ΔW_m分别为厚度系数、宽度系数、减宽量系数，均为一预设的常数(与钢种有关)。According to the formula:

Calculate and obtain the pass correction value of the nth pass of the current strip; for the current strip, where c _p,new is the pass correction value of the nth pass; c _p,old is the pass correction value of the nth pass; Pass correction value of n-1 pass; w ₀ is the use width of the nth pass; w ^* is the measured width value of the nth pass; H is the strip thickness of the nth pass; Δw is the nth pass The width reduction of the pass; β is the smoothing coefficient; H _m , W _m , and ΔW _m are the thickness coefficient, width coefficient, and width reduction coefficient, all of which are preset constants (related to steel grades).

Specifically, as shown in FIG. 5 , in step S21, the step of updating the inter-block correction value of the n-th pass of the current strip specifically includes:

Step S211b: Obtain the measured width value of the nth pass of the current steel strip.

Step S212b: According to the inter-block correction value of the nth pass of the previous strip, the target width and the measured width value of the nth pass of the current strip, and the current strip of the nth pass. The pass correction value of the n-pass is obtained, and the inter-block correction value of the n-th pass of the current strip steel block is obtained.

After the step of updating the inter-block correction value of the nth pass of the current strip, the method further includes:

Step S213b: Store the inter-block correction value of the n-th pass of the current strip for use by the next strip. Can be stored on the hard disk of this rolling production system model.

Wherein, the specific acquisition and calculation method of step S212b is:

According to the formula: c _b,new =α·c _b,old +(1-α)·(ww ^* -c _p,new ), calculate and obtain the inter-block correction value of the nth pass of the current strip steel block; For the current strip, where w is the target width of the nth pass, _cb,new is the inter-block correction value of the nth pass; _cb,old is the nth pass of the previous strip with the steel block time correction value; c _p,new is the pass correction value of the nth pass; α represents the smoothing coefficient.

If the total number of rolling passes for each strip is 6, the rolling passes can be numbered 1-6 in sequence. In the application scenario shown in FIG. 1, the rolling directions numbered 3 and 5 are opposite to the rolling directions numbered 1, 2, 4, and 6; if the first width gauge 106 only measures the first roughing mill 103 The strip width at the exit, the second width gauge 107 only measures the exit width of the second roughing mill 105 . Since the steel strip is rolled back and forth five times in the second roughing mill 105, the calculated passes are the passes numbered 1, 2, 4, and 6.

Taking SPHC (steel grade, hot-rolled steel plate) steel grade as an example, the specific implementation of the self-learning model is described. Before this strip enters the rolling line, the rolling production system model will obtain the basic parameters and self-learning coefficient parameters of the steel rolling. The basic parameters mainly include the thickness and width of the entrance and exit of each pass after load distribution; the self-learning parameters mainly include the correction value between blocks and the correction value of the pass, and the correction value between blocks comes from the self-learning update of the same pass of the previous steel block. Calculated, the pass correction value is initialized to 0. The basic information table of the width model is shown in the following table.

Table 1 Width model basic information table

pass number 1 2 3 4 5 6 Inlet thickness mm 234.82 194.93 155.91 118.52 86.81 61.21 Outlet thickness mm 194.93 155.91 118.52 86.81 61.21 42.74 Inlet width mm 1633.65 1548.42 1510.97 1516.62 1486.24 1490.38 target width mm 1548.42 1510.97 1516.62 1486.24 1490.38 1475.32 Correction value between blocks mm 10.90 5.33 0 3.27 0 1.21 Pass correction value mm 0 0 0 0 0 0 Width calculation pass n 1 2 3 4

Adopt the used width acquisition formula in step S12:

w ₀ =wc _b,old -c _p,old Formula 1)

A target width correction calculation is performed. The w ₀ obtained after the correction calculation is the working width adopted by the actual rolling production system model. The rolling production system model will calculate various control parameters according to the use width, and send them to the actuator to realize the width control. Before the strip enters the rough rolling area, the corrected control width of each pass is shown in the following table:

Table 2. The first setting to calculate the actual use width table

After the strip is calculated for the first pass, the width is measured by the first width measuring instrument 106 to obtain the actual measured width value. In this example, the measured width value is 1534.72mm. After obtaining the measured width value, the pass feedback self-learning value can be updated according to step S212a, and the calculation formula can be expressed as follows:

In this example the coefficient β=0.8, _Hm =350mm, _Wm =1500mm, _ΔWm =60mm. According to the calculated data and the measured value of the first pass in Table 1, it can be calculated that cp _,new =2.38mm.

The inter-block correction value is updated again according to step S212b, and its calculation formula is expressed as follows:

c _b,new =α·c _b,old +(1-α)·(ww ^* -c _p,new ) (Equation 3)

The coefficient α = 0.8 in this example. According to the first pass data and measured values in Table 1, it can be calculated that c _b,new =11.23mm. The correction value of the pass will be used for the correction of the subsequent pass or calculation pass of the current strip block; the correction value between blocks will be saved in the database and used for the width correction of this pass of the next strip. After the update calculation of the correction value of the pass and the correction value between blocks is updated, the setting calculation of the second subsequent pass is triggered. The control widths of the remaining rolling passes are shown in the table below:

Table 3 The second calculation of the actual outlet width table

pass number 2 3 4 5 6 target width mm 1510.97 1516.62 1486.24 1490.38 1475.32 Correction value between blocks mm 5.33 0 3.27 0 1.21 Pass correction value mm 2.38 2.38 2.38 2.38 2.38 Use width mm 1503.26 1514.24 1480.59 1488 1471.73

After the second pass of rolling is completed, the measured width value of 1502.13 mm measured by the second width measuring instrument 107 is obtained. Using formula 2 and formula 3 to update the self-learning value, the calculated pass cp,new = _0.99mm , cp _,new =7.34mm. After the update calculation is completed, the set calculation of the third calculation pass is triggered. The control width of the remaining rolling passes is shown in the following table:

Table 4 The third calculation of the actual outlet width table

pass number 3 4 5 6 target width mm 1516.62 1486.24 1490.38 1475.32 Correction value between blocks mm 0 3.27 0 1.21 Pass correction value mm 0.99 0.99 0.99 0.99 Use width mm 1515.63 1481.98 1489.39 1473.12

When the third rolling pass is completed, since it is a reverse pass, there is no measured width value, and self-learning calculation and setting calculation are not performed.

When the 4th pass of rolling is completed, the obtained width measured by the second width gauge 107 is 1483.26 mm. Using Formula 2 and Formula 3 to update the self-learning value, calculate cp, _new =-0.23mm and cp _,new =3.22mm for this pass. After the calculation is updated, the set calculation of the fourth subsequent pass is triggered. The control widths of the remaining passes are shown in the following table:

Table 5 The fourth calculation of the actual outlet width table

pass number 5 6 target width mm 1490.38 1475.32 Correction value between blocks mm 0 1.21 Pass correction value mm 0.99 0.99 Use width mm 1489.39 1473.12

When the 5th pass rolling is completed, since it is a reverse pass, self-learning calculation and setting calculation are not performed.

When the 6th pass of rolling is completed, a width gauge is obtained to measure the width of 1483.26mm. The self-learning value is updated by formula 2 and formula 3, and cp, _new =0.34mm and cp _,new =2.62mm of this pass are calculated. Since there are no subsequent passes, no set calculation will be performed. Save the correction value between blocks to the database, and finally get a set of correction value table between blocks, as shown in Table 6, which is used to correct the use width of the next strip. The rolling is completed, and the calculation update is ended.

Table 6 Self-learning value update table between blocks

As shown in FIG. 6 , the present invention further provides a strip width feedback correction system 300 , which is applied to width control during strip rolling. The system includes a parameter acquisition module 301 and a used width calculation module 302 .

Wherein, the parameter obtaining module 301 is used for obtaining the target width of the nth pass of the current strip steel block in the product processing process, and the pass correction value of the n-1th pass, during the production process of the product of the same specification, and the correction value between the nth pass of the previous strip steel block; the width calculation module 302 is used to obtain the target width of the nth pass of the current strip steel block in the product processing process, the first The pass correction value of the n-1 pass and the inter-block correction value of the n-th pass of the previous strip of steel blocks are used to obtain the use width of the n-th pass of the current strip of steel blocks.

Wherein, data exchange can be performed between the parameter acquisition module 301 and the usage width calculation module 302 .

In summary:

The strip width feedback correction method and system provided by the present invention use the methods of inter-block self-learning (obtaining the correction value between blocks) and pass feedback self-learning (obtaining the correction value of the pass), and at the same time use the rolling production system model The target width is corrected to get the used width. The deviation between the rolling production system model of the current secondary strip and the actual rolling process is eliminated by the correction value between the blocks of the previous strip. Using the calculation deviation of the previous pass through the pass correction value, the rolling production system model is adjusted in a feedback manner, and the calculation accuracy of the subsequent pass is improved. The present invention effectively improves the calculation precision of the high rolling production system model, maintains the stability and accuracy of the use width calculation, and improves the width control precision.

In the several embodiments provided in this application, it should be understood that the disclosed system and method can also be implemented in other manners. The system embodiments described above are merely illustrative, for example, the flowcharts and block diagrams in the Figures illustrate the architecture, functionality, and possible implementations of systems, methods and computer program products according to various embodiments of the present invention. operate. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more functions for implementing the specified logical function(s) executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It is also noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in dedicated hardware-based systems that perform the specified functions or actions , or can be implemented in a combination of dedicated hardware and computer instructions.

In addition, each functional module in each embodiment of the present invention may be integrated to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes . It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (7)

1. a strip width feedback correction method, applied to the width control in the strip rolling process, is characterized in that, comprises: During the production process of products of the same specification, obtain the target width of the nth pass of the current strip in the product processing process, the pass correction value of the n-1th pass of the current strip, and the above The correction value between blocks of the nth pass with a steel block; Wherein, the pass correction value of the n-1th pass of the current strip represents the difference between the calculated width of the rolling production system model of the current strip after the n-1th pass and the current strip. The first deviation of the measured width value after the n-1th pass; the block-to-block correction value of the nth pass of the previous strip of steel blocks represents the The second deviation between the calculated width of the rolling production system model and the measured width value after the nth pass of the previous strip; n is the number of passes for the width control calculation; According to the obtained target width of the nth pass of the current steel strip during the product processing, the pass correction value of the n-1th pass of the current strip, and the pass correction value of the n-1th pass of the current strip, and the The correction value between n-pass blocks to obtain the use width of the n-th pass of the current strip; updating the pass correction value of the nth pass of the current steel strip; wherein, including: acquiring the physical parameters of the current strip and the measured width value of the nth pass of the current strip; The physical parameters of the current strip steel block include: thickness and width reduction; according to the formula:

Calculate and obtain the pass correction value of the nth pass of the current strip block; for the current strip block, _cp,new is the pass correction value of the nth pass; _cp,old is the nth pass -1 pass correction value; w ₀ is the use width of the nth pass; w ^* is the measured width value of the nth pass; H is the strip thickness of the nth pass; w is the nth pass Δw is the widening amount of the nth pass; β is the smoothing coefficient; H _m , W _m , and ΔW _m are the thickness coefficient, width coefficient, and widening coefficient, respectively. 2 . The method according to claim 1 , wherein when the number of passes n is 1, the pass correction value of the 0th pass of the current strip is 0. 3 . 3 . The method according to claim 1 , wherein, according to the obtained target width of the n-th pass of the current steel strip in the product processing process, the n-1 th of the current steel strip is After the step of obtaining the used width of the nth pass of the current steel strip after obtaining the pass correction value of the pass and the inter-block correction value of the nth pass of the previous strip steel block, it also includes: The block-to-block correction value of the nth pass of the current strip block is updated. 4. The method according to claim 3, wherein the step of updating the inter-block correction value of the nth pass of the current strip specifically comprises: Obtain the measured width value of the nth pass of the current strip; According to the interblock correction value of the nth pass of the previous strip, the target width and the measured width value of the nth pass of the current strip, and the nth pass of the current strip The correction value of the pass is obtained, and the correction value between blocks of the nth pass of the current strip is obtained; After the step of updating the inter-block correction value of the n-th pass of the current strip steel block, the method further includes: storing the inter-block correction value of the n-th pass of the current strip steel block for the next time. Use with steel blocks. 5 . The method according to claim 4 , wherein the target width of the n-th pass of the current steel strip is based on the inter-block correction value of the n-th pass of the previous steel strip. 6 . The step of obtaining the interblock correction value of the nth pass of the current strip steel block with the measured width value and the pass correction value of the nth pass of the current strip steel block specifically includes: According to the formula: c _b,new =α·c _b,old +(1-α)·(ww ^* -c _p,new ), calculate and obtain the inter-block correction value of the nth pass of the current strip steel block; For the current strip, where w is the target width of the nth pass, _cb,new is the inter-block correction value of the nth pass; _cb,old is the nth pass of the previous strip with the steel block time correction value; c _p,new is the pass correction value of the nth pass; α represents the smoothing coefficient. 6. The method according to any one of claims 1-5, characterized in that, the total number of rolling passes for each strip is 6, and the numbers are 1-6 in sequence, and the rolling numbers are 3 and 5. The direction is opposite to the rolling direction numbered 1, 2, 4, 6; 7. The method according to any one of claims 1-5, wherein, according to the obtained target width of the nth pass of the current strip in the product processing process, the n-1th pass The steps of obtaining the use width of the nth pass of the current steel strip include: According to w ₀ =wc _b,old -c _p,old , calculate and obtain the use width of the nth pass of the current strip; for the current strip, w ₀ is the use width of the nth pass ; w is the target width of the nth pass; c _b,old is the block correction value of the nth pass with the previous steel block; c _p,old is the pass correction value of the n-1th pass.

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