CN108994086B - Strip steel width feedback correction method - Google Patents
Strip steel width feedback correction method Download PDFInfo
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- CN108994086B CN108994086B CN201811114204.2A CN201811114204A CN108994086B CN 108994086 B CN108994086 B CN 108994086B CN 201811114204 A CN201811114204 A CN 201811114204A CN 108994086 B CN108994086 B CN 108994086B
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Abstract
According to the feedback correction method and system for the strip steel width, provided by the embodiment of the invention, aiming at the width control scheme in the prior art, 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-1) th pass and the inter-block correction value of the nth pass of the previous strip steel block are obtained. And then obtaining the use width of the nth pass of the current strip steel block 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-1) th pass and the nth pass inter-block correction value of the previous strip steel block. The invention comprehensively considers the current strip steel block self-proceeding parameter and the error relation between the adjacent strip steel blocks, and finally obtains the use width data with higher precision.
Description
Technical Field
The invention relates to the technical field of production control, in particular to a strip steel width feedback correction method.
Background
In the production process of hot rolled strip steel, the width control of the strip steel is mainly finished in a rough rolling area. The main rolling equipment in the rough rolling area comprises a rough descaling machine, a pressure width fixing machine, a rough rolling machine and the like. Wherein the roughing mill consists of a vertical rolling mill and a horizontal rolling mill. The pressure width fixing machine and the vertical rolling mill have width reduction control capability, and the rolled piece can be widened after passing through the horizontal rolling mill. The rough rolling width control is the process of alternately controlling the width reducing process and the widening process to realize the target width.
The rough rolling width control model is mainly used for distributing a width control target to each pass of rolling according to incoming material data and product data. The accuracy of the width model of each pass directly influences the accuracy of the width control. For example, friction factors are introduced to improve the calculation accuracy of the calculation physical model; for another example, in the width self-learning process, the acquisition process of the measured values is optimized, so that the calculation accuracy of the self-learning coefficients is improved; for another example, the width of the incoming material is detected to reduce the influence of the width fluctuation on the model, and the like. However, in the width control model adopted above, when processing the strip steel blocks with the same processing requirements and the same specifications, only the parameters of the current processed strip steel block are processed, and the relation between the adjacent strip steel blocks and the current strip steel block is ignored, so that the accuracy of the width control data of the current pass of the strip steel block is difficult to further improve.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method for feedback correction of strip width, which solves the technical problem in the prior art that the accuracy of width control data of a current pass of a strip block is low due to neglecting the relationship between adjacent strip blocks and a current strip block when the strip block is processed.
The embodiment of the invention is realized by the following steps:
a strip steel width feedback correction method is applied to width control in a strip steel block rolling process and comprises the following steps: in the production process of products with the same specification, acquiring 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-1) th pass of the current strip steel block and the nth pass inter-block correction value of the previous strip steel block; the pass correction value of the (n-1) th pass of the current strip steel block represents a first deviation amount of the calculated width of the rolling production system model of the current strip steel block after the (n-1) th pass and the actually measured width value of the current strip steel block after the (n-1) th pass; the inter-block correction value of the nth pass of the previous strip steel block represents a second deviation value of the calculated width of the rolling production system model of the previous strip steel block after the nth pass and the actually measured width value of the previous strip steel block after the nth pass; n is the track number of width control calculation; and obtaining the use width of the nth pass of the current strip steel block 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-1) th pass of the current strip steel block and the nth pass inter-block correction value of the previous strip steel block.
Preferably, when the number of passes n is 1, the pass correction value of the 0 th pass of the current strip steel block is 0.
Preferably, after the step of obtaining the use width of the nth pass of the current strip steel block 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 nth-1 pass of the current strip steel block, and the nth-pass inter-block correction value of the previous strip steel block, the method further includes: updating the pass correction value of the nth pass of the current strip steel block and/or updating the inter-block correction value of the nth pass of the current strip steel block.
Preferably, the step of updating the pass correction value of the nth pass of the current strip steel block specifically includes: acquiring physical parameters of the current strip steel block and an actually measured width value of the nth pass of the current strip steel block; the physical parameters of the current strip steel block comprise: thickness and width reduction; and obtaining the pass correction value of the nth pass of the current strip steel block according to the obtained physical parameters of the current strip steel block, the measured width value of the nth pass of the current strip steel block, the pass correction value of the (n-1) th pass of the current strip steel block and the use width of the nth pass of the current strip steel block.
Preferably, the step of obtaining the pass correction value of the nth pass according to the obtained physical parameter of the current strip steel block, the measured width value of the nth pass of the current strip steel block, the pass correction value of the (n-1) th pass of the current strip steel block, and the used width of the nth pass of the current strip steel block specifically includes: according to the formula:
calculating and obtaining a pass correction value of the nth pass of the current strip steel block; for the current strip block, wherein cp,newThe channel correction value is the channel correction value of the nth channel; c. Cp,oldThe pass correction value is the (n-1) th pass correction value; w is a0The using width of the nth pass; w is a*Measured width value of nth pass, H thickness of nth pass, delta w width reduction of nth pass, β smoothing coefficient, Hm、Wm、ΔWmThe thickness coefficient, the width coefficient and the width reduction coefficient are respectively.
Preferably, the step of updating the inter-block correction value of the nth pass of the current strip steel block specifically includes: acquiring an actual measurement width value of the nth pass of the current strip steel block; obtaining an inter-block correction value of the nth pass of the current strip steel block according to the inter-block correction value of the nth pass of the previous strip steel block, the target width and the actually measured width value of the nth pass of the current strip steel block and the pass correction value of the nth pass of the current strip steel block; after the step of updating the inter-block correction value of the nth pass of the current strip steel block, the method further includes: and storing the inter-block correction value of the nth pass of the current strip steel block for the next strip steel block.
Preferably, the step of obtaining the inter-block correction value of the nth pass of the current strip steel block according to the inter-block correction value of 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 pass correction value of the nth pass of the current strip steel block specifically includes: according to the formula: c. Cb,new＝α·cb,old+(1-α)·(w-w*-cp,new) Calculating to obtain an inter-block correction value of the nth pass of the current strip steel block; for the current strip steel block, w is the target width of the nth pass, cb,newThe inter-block correction value of the nth pass; c. Cb,oldThe inter-block correction value of the nth pass of the previous strip steel block; c. Cp,newPass correction value for the nth pass, α represents the smoothing factor.
Preferably, the total pass of rolling each strip steel is 6 times, and the numbers of the total passes are 1-6 in sequence, wherein the rolling directions numbered as 3 and 5 are opposite to the rolling directions numbered as 1, 2, 4 and 6; the calculated passes are numbered 1, 2, 4, 6.
Preferably, the step of obtaining the use width of the nth pass of the current strip steel block 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-1) th pass, and the nth-pass inter-block correction value of the previous strip steel block specifically includes: according to w0＝w-cb,old-cp,oldCalculating to obtain the use width of the nth pass of the current strip steel block; for the current strip block, w0The using width of the nth pass; w is the target width of the nth pass; c. Cb,oldThe inter-block correction value of the nth pass of the previous strip steel block; c. Cp,oldIs the pass correction value of the (n-1) th pass.
A strip steel width feedback correction system is applied to width control in a strip steel block rolling process and comprises the following steps: the parameter acquisition module is used for acquiring the target width of the nth pass, the pass correction value of the (n-1) th pass and the inter-block correction value of the nth pass of the previous strip steel block in the product processing process in the production process of products with the same specification; the pass correction value of the (n-1) th pass of the current strip steel block represents the deviation amount of the calculated width of the rolling production system model of the current strip steel block after the (n-1) th pass and the actually measured width value of the current strip steel block after the (n-1) th pass; the inter-block correction value of the nth pass of the previous strip steel block represents the deviation value of the calculated width of the rolling production system model of the previous strip steel block after the nth pass and the actually measured width value of the previous strip steel block after the nth pass; n is the track number of width control calculation; and the use width calculation module is used for obtaining the use width of the nth pass of the current strip steel block 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-1) th pass and the nth pass inter-block correction value of the previous strip steel block.
According to the feedback correction method for the strip steel width, in the production process of products with the same specification, the obtained 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-1) th pass are used for calculating the use width of the nth pass of the current strip steel block, and the deviation value between the model calculation width and the actually measured width value of the current strip steel block in the adjacent rolling pass is considered; meanwhile, the inter-block correction value of the previous strip steel block in the nth pass is combined to be used for calculating the use width of the current strip steel block in the nth pass, and the deviation value between the model calculation width and the measured width in the same rolling pass of the adjacent strip steel block in a processing control system is considered. Finally, comprehensively obtaining the use width of the nth pass of the current strip steel block; compared with the prior art, compared with the method for independently considering the self parameters of the current strip steel block, the use width comprehensively considers the error (the n-th inter-block correction value of the previous strip steel block) of the previous strip steel block of the current strip steel block in the n-th rolling process, so that the accuracy of the use width of the current n-th pass is further improved, and the control precision of the inlet width of the strip steel block in the subsequent processing passes is also ensured.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a strip steel production line according to a preferred embodiment of the present invention.
Fig. 2 is a flowchart of a method of a strip width feedback correction method according to a preferred embodiment of the present invention.
Fig. 3 is a flowchart of a second method of the present invention for feedback correction of strip width.
FIG. 4 is a flowchart of a method of one embodiment of step S21 of FIG. 3.
Fig. 5 is a flowchart of a second method of the embodiment of step S21 in fig. 3.
Fig. 6 is a functional block diagram of a strip width feedback correction system according to a preferred embodiment.
Icon: 100-strip steel production line; 101-a phosphorus removal device; 102-pressure width fixing machine; 103-a first roughing mill; 104-a vertical rolling mill; 105-a second roughing mill; 106-a first width gauge; 107-a second width gauge; 108-production line; 300-a strip steel width feedback correction system; 301-parameter acquisition module; 302-use width calculation module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The strip steel production line 100 shown in fig. 1, not shown completely, only shows the control related parts of the present invention, and the strip steel production line 100 is one of the application scenarios of the present invention, and is only used for explaining the present invention, so as to understand, and should not be taken as a limitation to the protection scope of the present invention.
In the process of rolling the strip steel blocks, the devices installed according to the sequence of the production line 108 are a phosphorus removal device 101, a pressure width fixing machine 102, a first roughing mill 103, a first width gauge 106, a second roughing mill 105, a vertical rolling mill 104 and a second width gauge 107. In the processing process, the strip steel blocks move on the production line, the strip steel blocks can be recorded as one-time rolling processing every time the strip steel blocks pass through the first roughing mill 103 or the second roughing mill 105, meanwhile, the width value of each strip steel block measured by the first width gauge 106 or the second width gauge 107 is recorded as an actually measured width value, and the current time of rolling processing is defined as one width control calculation pass and 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 may be used, and the first width gauge 106 or the second width gauge 107 may be installed on both sides of the roughing mill used, or only the first width gauge 106 or the second width gauge 107 may be installed on one side of the roughing mill used for measurement. And are not limited.
The operation of each parameter of the production line can be controlled and adjusted through a rolling production system model.
Referring to fig. 2, a flowchart of a method for feedback correction of strip width applicable to the scenario of the strip production line 100 shown in fig. 1 according to a preferred embodiment of the present invention is shown. The specific process shown in fig. 2 will be described in detail below.
Step S11: and acquiring 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-1) th pass of the current strip steel block and the nth pass inter-block correction value of the previous strip steel block.
The target width is the width value of the strip block which is already set at the rolling outlet of the current strip block in the nth rolling pass (namely, the width value of the strip block is required to be obtained and is used as the width value of the strip block at the inlet of the next rolling processing process). The pass correction value of the (n-1) th pass of the current strip steel block represents a first deviation value of the calculated width of the rolling production system model of the current strip steel block after the (n-1) th pass and the actually measured width value of the current strip steel block after the (n-1) th pass; the measured width value can be measured by the first width meter 106 or the second width meter 107; the rolling production system model calculates the width as a specific parameter value in the rolling production system (equipment).
The inter-block correction value of the nth pass of the previous strip steel block represents a second deviation value of the calculated width of the rolling production system model of the previous strip steel block after the nth pass and the actually measured width value of the previous strip steel block after the nth pass; n is the number of tracks for which the width control calculation is performed.
The above-mentioned first deviation amount and the second deviation amount both represent the magnitude of the deviation degree, and are not necessarily the specific length value of the deviation, and the calculation (obtaining) methods of the first deviation amount and the second deviation amount may be different (as described in the following c)b,oldAnd cp,old)。
Step S12: and obtaining the use width of the nth pass of the current strip steel block 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-1) th pass and the nth pass inter-block correction value of the previous strip steel block.
The using width is an actual used parameter value (outlet width) obtained after the preset width of the current strip steel block at the outlet in the rolling production system model is corrected when the current strip steel block is rolled in the nth pass. At the moment, the rolling production system model can calculate various control parameters according to the using width and sends the control parameters to the executing mechanism, so that high-precision width control is realized.
The specific calculation method in step S12 may be: according to w0＝w-cb,old-cp,oldAnd calculating to obtain the use width of the nth pass of the current strip steel block. For the current strip block, w0The using width of the nth pass; w is the target width of the nth pass; c. Cb,oldThe inter-block correction value of the nth pass of the previous strip steel block; c. Cp,oldThe pass correction value is the pass correction value of the (n-1) th pass of the current strip steel block.
It should be noted that, at the time of the 1 st pass calculation, since the first width measuring instrument 106 does not measure the measured width value of the current strip steel block before that, the pass correction value is not generated. The pass correction value is 0. That is, when the pass number n is 1, the pass correction value of the 0 th pass of the current strip steel block is 0.
As shown in fig. 3, after step S12, the method further includes:
step S21: updating the pass correction value of the nth pass of the current strip steel block and/or updating the inter-block correction value of the nth pass of the current strip steel block.
The updated pass correction value of the nth pass of the current strip steel block can be used for calculating the next pass (the (n + 1) th pass) of the current strip steel block, and if the next pass does not exist, the calculation is stopped; and updating the inter-block correction value of the nth pass of the current strip steel block, wherein the inter-block correction value can be used for calculating the same pass (nth pass) of the next strip steel block.
Specifically, as shown in fig. 4, in step S21, the specific manner of updating the pass correction value of the nth pass of the current strip steel block includes:
step S211 a: acquiring physical parameters of the current strip steel block and an actually measured width value of the nth pass of the current strip steel block; the physical parameters of the current strip steel block comprise: thickness and width reduction;
wherein the amount of width reduction is: the width reduction amount of the strip steel in the rolling pass is equal to the width of the entrance of the strip steel pass minus the target width of the exit of the strip steel when the pass is finished.
Step S212 a: and obtaining the pass correction value of the nth pass of the current strip steel block according to the obtained physical parameters of the current strip steel block, the measured width value of the nth pass of the current strip steel block, the pass correction value of the (n-1) th pass of the current strip steel block and the use width of the nth pass of the current strip steel block.
Further, the specific calculation manner of step S212a may be:
according to the formula:
calculating and obtaining a pass correction value of the nth pass of the current strip steel block; for the current strip steel block, wherein cp,newThe channel correction value is the channel correction value of the nth channel; c. Cp,oldThe pass correction value is the (n-1) th pass correction value; w is a0The using width of the nth pass; w is a*Measured width value of nth pass, H thickness of nth pass, delta w width reduction of nth pass, β smoothing coefficient, Hm、Wm、ΔWmThe thickness coefficient, the width coefficient and the width reduction coefficient are respectively a preset constant (related to steel grade).
Specifically, as shown in fig. 5, in step S21, the step of updating the inter-block correction value of the nth pass of the current strip steel block specifically includes:
step S211 b: and acquiring the actual measurement width value of the nth pass of the current strip steel block.
Step S212 b: and obtaining the inter-block correction value of the nth pass of the current strip steel block according to the inter-block correction value of the nth pass of the previous strip steel block, the target width and the actually measured width value of the nth pass of the current strip steel block and the pass correction value of the nth pass of the current strip steel block.
After the step of updating the inter-block correction value of the nth pass of the current strip steel block, the method further includes:
step S213 b: and storing the inter-block correction value of the nth pass of the current strip steel block for the next strip steel block. May be stored in the hard disk of the rolling production system model.
The specific acquiring and calculating manner of step S212b is as follows:
according to the formula: c. Cb,new＝α·cb,old+(1-α)·(w-w*-cp,new) Calculating to obtain an inter-block correction value of the nth pass of the current strip steel block; for the current strip steel block, w is the target width of the nth pass, cb,newThe inter-block correction value of the nth pass; c. Cb,oldThe inter-block correction value of the nth pass of the previous strip steel block; c. Cp,newPass correction value for the nth pass, α represents the smoothing factor.
If the total number of rolling passes of each strip steel is 6, the number of the rolling passes can be 1-6 in sequence. In the application scenario shown in fig. 1, in which the rolling directions numbered 3, 5 are opposite to the rolling directions numbered 1, 2, 4, 6; if the first width gauge 106 measures only the strip width at the exit of the first roughing mill 103, the second width gauge 107 measures only the exit width of the second roughing mill 105. Since the block is rolled back and forth 5 times in the second roughing mill 105, the passes to be calculated are the passes numbered 1, 2, 4, and 6.
The specific embodiment of the self-learning model is described by taking SPHC (steel grade designation, hot rolled steel sheet) steel grade as an example. Before the strip steel block enters a rolling line, the rolling production system model can obtain basic parameters and self-learning coefficient parameters of the steel rolling. The basic parameters mainly comprise the thickness and width of an entrance and an exit of each pass after load distribution; the self-learning parameters mainly comprise inter-block correction values and pass correction values, the inter-block correction values are obtained from self-learning updating calculation of the same pass of the previous strip steel block, and the pass correction values are initialized to be 0. The table of the width model base information is shown in the following table.
TABLE 1 Width model base 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 mm between blocks | 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 |
The usage width acquisition formula in step S12 is employed:
w0＝w-cb,old-cp,oldformula 1)
And carrying out target width correction calculation. Correcting the calculated w0The width of use adopted by the actual rolling production system model is. The rolling production system model can calculate various control parameters according to the using width and sends the control parameters to the executing mechanism to realize width control. Before the strip steel block enters the rough rolling area, the control width after each pass correction is shown as the following table:
TABLE 2 first-time setting calculation actual use Width Table
After the 1 st pass calculation is carried out on the strip steel, the width measurement is carried out through the first width gauge 106 to obtain an actually measured width value. In this example, the measured width value is 1534.72mm, and after the measured width value is obtained, the pass feedback self-learning value can be updated according to step S212a, and the calculation formula can be expressed as follows:
coefficient β in this example is 0.8, Hm＝350mm，Wm＝1500mm，ΔWm60 mm. From the data and measured values calculated in the 1 st pass in Table 1, c can be calculatedp,new＝2.38mm。
The inter-block correction value is updated according to step S212b, and the calculation formula is as follows:
cb,new＝α·cb,old+(1-α)·(w-w*-cp,new) (formula 3)
In this example, the coefficient α is 0.8, according to the data and results of pass 1 in Table 1Measured value, c can be calculatedb,new11.23 mm. The pass correction value is used for correcting the subsequent pass or the calculation pass of the current strip steel block; the inter-block correction value will be saved to the database for the width correction of that pass of the next strip. And triggering the setting calculation of the second subsequent pass after updating the pass correction value and the inter-block correction value. The control widths for the remaining rolling passes are shown in the following table:
TABLE 3 second calculation of 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 mm between blocks | 5.33 | 0 | 3.27 | 0 | 1.21 |
| Pass correction value mm | 2.38 | 2.38 | 2.38 | 2.38 | 2.38 |
| Using width mm | 1503.26 | 1514.24 | 1480.59 | 1488 | 1471.73 |
When the 2 nd pass rolling is finished, the measured width value measured by the second width gauge 107 is obtained, namely 1502.13 mm. Updating self-learning values by adopting a formula 2 and a formula 3, and calculating c of the calculation passp,new＝0.99mm，cp,new7.34 mm. And after the updating calculation is finished, triggering the setting calculation of the 3 rd calculation pass. The control widths for the remaining rolling passes are shown in the following table:
TABLE 4 third calculation actual Outlet Width Table
| Pass number | 3 | 4 | 5 | 6 |
| Target width mm | 1516.62 | 1486.24 | 1490.38 | 1475.32 |
| Correction value mm between blocks | 0 | 3.27 | 0 | 1.21 |
| Pass correction value mm | 0.99 | 0.99 | 0.99 | 0.99 |
| Using width mm | 1515.63 | 1481.98 | 1489.39 | 1473.12 |
After the rolling of the 3 rd rolling pass is finished, because the rolling is a reverse pass, no actual measurement width value exists, and self-learning calculation and setting calculation are not performed.
When the 4 th pass rolling is completed, the measured width value measured by the second width gauge 107 is 1483.26 mm. Updating self-learning values by adopting a formula 2 and a formula 3, and calculating c of the current passp,new＝-0.23mm，cp,new3.22 mm. And after the calculation is updated, triggering the setting calculation of the fourth subsequent pass. The control widths of the remaining passes are shown in the following table:
TABLE 5 fourth calculation of actual Outlet Width Table
| Pass number | 5 | 6 |
| Target width mm | 1490.38 | 1475.32 |
| Correction value mm between blocks | 0 | 1.21 |
| Pass correction value mm | 0.99 | 0.99 |
| Using width mm | 1489.39 | 1473.12 |
After the 5 th pass rolling is finished, the self-learning calculation and the setting calculation are not carried out due to the fact that the pass is the reverse pass.
When the 6 th pass rolling is finished, a width measuring instrument measuring width 1483.26mm is obtained. Updating self-learning values by adopting a formula 2 and a formula 3, and calculating c of the current passp,new＝0.34mm，cp,new2.62 mm. Since there is no subsequent pass, no setting calculation is performed. And storing the inter-block correction value into a database to finally obtain a group of inter-block correction value tables, as shown in table 6, for correcting the use width of the next strip steel. And finishing the calculation updating after the rolling is finished.
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 in a strip block rolling process, and the system comprises: a parameter acquisition module 301 and a usage width calculation module 302.
The parameter obtaining module 301 is configured to obtain, in a production process of a product with the same specification, a target width of an nth pass of a current strip steel block, a pass correction value of an nth-1 pass of the current strip steel block in a product processing process, and an nth-pass inter-block correction value of a previous strip steel block; and the use width calculation module 302 is configured to obtain the use width of the current strip steel block at the nth pass according to the obtained target width of the current strip steel block at the nth pass in the product processing process, the pass correction value of the nth-1 pass, and the nth inter-block correction value of the previous strip steel block.
Data exchange can be performed between the parameter obtaining module 301 and the usage width calculating module 302.
In summary, the following steps:
the method uses the modes of inter-block self-learning (obtaining inter-block correction values) and pass feedback self-learning (obtaining pass correction values), and corrects the target width used by a rolling production system model to obtain the used width. And the deviation between the rolling production system model of the current strip steel block and the actual rolling process is eliminated through the inter-block correction value of the previous strip steel block. And adjusting the rolling production system model in a feedback mode by using the calculation deviation of the previous pass through the pass correction value, so that the calculation precision of the subsequent pass is improved. The invention effectively improves the calculation precision of the high rolling production system model, maintains the accuracy of the width calculation stability and improves the width control precision.
In the several embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. The system embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). 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 shown 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 will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A strip steel width feedback correction method is applied to width control in a strip steel block rolling process and is characterized by comprising the following steps:
in the production process of products with the same specification, acquiring 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-1) th pass of the current strip steel block and the nth pass inter-block correction value of the previous strip steel block;
the pass correction value of the (n-1) th pass of the current strip steel block represents a first deviation amount of the calculated width of the rolling production system model of the current strip steel block after the (n-1) th pass and the actually measured width value of the current strip steel block after the (n-1) th pass; the inter-block correction value of the nth pass of the previous strip steel block represents a second deviation value of the calculated width of the rolling production system model of the previous strip steel block after the nth pass and the actually measured width value of the previous strip steel block after the nth pass; n is the track number of width control calculation;
obtaining the use width of the nth pass of the current strip steel block 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-1) th pass of the current strip steel block and the nth pass inter-block correction value of the previous strip steel block;
updating the pass correction value of the nth pass of the current strip steel block; wherein, include: acquiring physical parameters of the current strip steel block and an actually measured width value of the nth pass of the current strip steel block; the physical parameters of the current strip steel block comprise: thickness and width reduction; according to the formula:
calculating and obtaining a pass correction value of the nth pass of the current strip steel block; for the current strip block, wherein cp,newThe channel correction value is the channel correction value of the nth channel; c. Cp,oldThe pass correction value is the (n-1) th pass correction value; w is a0The using width of the nth pass; w is a*Measured width value of the nth pass, H thickness of the nth pass, w target width of the nth pass, delta w width reduction amount of the nth pass, and β smoothing coefficient；Hm、Wm、ΔWmThe thickness coefficient, the width coefficient and the width reduction coefficient are respectively.
2. The method according to claim 1, wherein the pass correction value of the 0 th pass of the current strip is 0 when the pass number n is 1.
3. The method according to claim 1, wherein after the step of obtaining the use width of the nth pass of the current block according to the obtained target width of the nth pass of the current block, the pass correction value of the (n-1) th pass of the current block, and the nth inter-block correction value of the previous block during the product processing, the method further comprises:
and updating the inter-block correction value of the nth pass of the current strip steel block.
4. The method according to claim 3, wherein the step of updating the inter-block correction value for the nth pass of the current strip steel block comprises:
acquiring an actual measurement width value of the nth pass of the current strip steel block;
obtaining an inter-block correction value of the nth pass of the current strip steel block according to the inter-block correction value of the nth pass of the previous strip steel block, the target width and the actually measured width value of the nth pass of the current strip steel block and the pass correction value of the nth pass of the current strip steel block;
after the step of updating the inter-block correction value of the nth pass of the current strip steel block, the method further includes: and storing the inter-block correction value of the nth pass of the current strip steel block for the next strip steel block.
5. The method according to claim 4, wherein the step of obtaining the inter-block correction value of the nth pass of the current block according to the inter-block correction value of the nth pass of the previous block, the target width and the measured width value of the nth pass of the current block, and the pass correction value of the nth pass of the current block specifically comprises:
according to the formula: c. Cb,new＝α·cb,old+(1-α)·(w-w*-cp,new) Calculating to obtain an inter-block correction value of the nth pass of the current strip steel block; for the current strip steel block, w is the target width of the nth pass, cb,newThe inter-block correction value of the nth pass; c. Cb,oldThe inter-block correction value of the nth pass of the previous strip steel block; c. Cp,newPass correction value for the nth pass, α represents the smoothing factor.
6. The method according to any one of claims 1 to 5, characterized in that each strip is rolled 6 total passes, numbered 1 to 6 in sequence, wherein the rolling directions numbered 3, 5 are opposite to the rolling directions numbered 1, 2, 4, 6; the calculated passes are numbered 1, 2, 4, 6.
7. The method according to any one of claims 1 to 5, wherein the step of obtaining the use width of the nth pass of the current strip steel block 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 nth-1 pass and the nth-pass inter-block correction value of the previous strip steel block specifically comprises:
according to w0＝w-cb,old-cp,oldCalculating to obtain the use width of the nth pass of the current strip steel block; for the current strip block, w0The using width of the nth pass; w is the target width of the nth pass; c. Cb,oldThe inter-block correction value of the nth pass of the previous strip steel block; c. Cp,oldIs the pass correction value of the (n-1) th pass.
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