A method for stabilizing strip wedge control during rolling

Abstract

The application discloses a kind of stable strip steel wedge shape control method in rolling process, belong to hot continuous rolling finishing technical field, the method includes: according to the steel grade of strip steel, target thickness and deviation value, judge whether to trigger wedge shape control logic;After triggering wedge shape control logic, if the wedge value of strip steel exceeds preset wedge value interval, then determine roll gap adjustment amount based on wedge shape control model, and the determined roll gap adjustment amount is issued to rolling mill, and roll gap adjustment is carried out;After triggering wedge shape control logic, according to the wave shape value of strip steel, judge whether to stop wedge shape control logic currently.The stable strip steel wedge shape control method in rolling process provided by the application can effectively improve the asymmetric shape of strip steel while reducing the degree of operator intervention, improve the stability and safety of the rolling process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot continuous rolling finishing rolling, in particular to a method for controlling strip wedge in a stable rolling process. BACKGROUND

[0002] With the increasingly strict requirements on product quality of steel enterprises, the control result of shape quality has become an important competitiveness of the steel plant. For hot continuous rolling, the control precision of the current control of the crown and other symmetrical shapes has reached a high level, but there are still many deficiencies in the non-symmetrical shape. The causes of the non-symmetrical shape are complex, such as wedge of the rolled piece, center line offset of the rolled piece, poor rigidity of the rolling mill and transverse temperature difference of the rolled piece, which makes it difficult to establish a control model, and there is still no relatively mature online control system. For the problems of strip wedge and deviation, most steel plants still rely on the manual experience of operators, which makes the wedge and deviation control inaccurate, random and different in scale, which not only affects the production efficiency of the finishing rolling, but also cannot achieve accurate control of the wedge.

[0003] As can be seen from the above, the strip wedge and the strip deviation are coupled, which may damage important equipment such as rolls and guides in the rolling process, and even cause a steel pile accident, directly leading to the production stagnation of the steel enterprise and causing safety problems. In addition, the strip wedge is one of the important indicators of the finishing rolling outlet quality. If the wedge control is not up to standard, it is easy to cause the small thickness strip to wave in the rolling process, causing serious shape problems. At present, the control of the wedge relies on manual adjustment by operators, which has serious subjective speculation, inaccuracy and low efficiency. Therefore, it is urgent to design and develop a control model for the wedge of the hot continuous rolling finishing rolling. SUMMARY

[0004] The present application provides a method for controlling the wedge of a strip in a stable rolling process, to solve the technical problems of the current control of the wedge relying on manual adjustment, which has serious subjective speculation, inaccuracy and low efficiency.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] On the one hand, the present application provides a method for controlling the wedge of a strip in a stable rolling process, which is suitable for a hot continuous rolling mill, and the method comprises:

[0007] According to the steel grade, target thickness and deviation value of the strip, it is judged whether the wedge control logic is triggered or not;

[0008] After triggering the wedge control logic, if the wedge value of the strip steel exceeds the preset wedge value interval, the roll gap adjustment amount is determined based on the wedge control model, and the determined roll gap adjustment amount is sent to the rolling mill for roll gap adjustment.

[0009] After triggering the wedge control logic, whether to stop the wedge control logic is determined according to the wave value of the strip steel.

[0010] Further, the determination whether to trigger the wedge control logic according to the steel grade, target thickness and run-off value of the strip steel comprises:

[0011] S11, when receiving the flying shear head signal, the steel grade and target thickness of the strip steel are obtained, and it is determined whether the steel grade of the current strip steel belongs to the steel grade which does not need to be subjected to wedge control, if the steel grade of the current strip steel belongs to the steel grade which does not need to be subjected to wedge control, the wedge control logic is not triggered, otherwise, S12 is executed;

[0012] S12, it is determined whether the target thickness of the strip steel is within the preset thickness interval, if the target thickness of the strip steel is not within the preset thickness interval, the wedge control logic is not triggered, otherwise, S13 is executed;

[0013] S13, the run-off value of the strip steel corresponding to each stand is obtained in real time, and it is determined whether the run-off value of the strip steel corresponding to each stand is within the preset run-off value interval, if the run-off value of the strip steel corresponding to each stand is within the preset run-off value interval, the wedge control logic is triggered, otherwise, the wedge control logic is not triggered, and an alarm is prompted.

[0014] Further, after triggering the wedge control logic, if the wedge value of the strip steel exceeds the preset wedge value interval, the roll gap adjustment amount is determined based on the wedge control model, and the determined roll gap adjustment amount is sent to the rolling mill for roll gap adjustment, comprising:

[0015] Every first preset period, the wedge value W of the F7 stand outlet is obtained means ;

[0016] If W means_min ≤ W means ≤ W means_max , it is considered that the wedge value of the strip steel is within an acceptable range and is not controlled, if W means > W means_max or W means < W means_min , the roll gap adjustment amount of each stand is calculated by using the wedge control model: wherein, W means_min is a lower limit value of the wedge reasonable range, and W means_max is an upper limit value of the wedge reasonable range.

[0017] The roll gap adjustment amount of each stand calculated by using the wedge control model is subjected to amplitude limiting processing respectively.

[0018] The roll gap adjustment amount of each stand after the limiting processing is sent to the rolling mill to perform roll gap adjustment.

[0019] Further, the expression of the wedge control model is:

[0020]

[0021] Wherein, ΔS i represents the roll gap adjustment amount of the i th stand; e represents a preset attenuation coefficient; S tdi represents the preset stand factor corresponding to the i th stand; D m represents the critical parameter of the strip wave; h i represents the exit thickness of the i th stand; W represents the exit width of the F7 stand of the strip; a represents a preset wave factor; K w represents a preset wedge control coefficient; K i represents a preset distribution coefficient corresponding to the i th stand.

[0022] Further, the roll gap adjustment amount of each stand calculated by the wedge control model is respectively subjected to limiting processing, comprising:

[0023] The calculated roll gap adjustment amount is subjected to single limiting processing;

[0024] The roll gap adjustment amount after the single limiting processing is subjected to total limiting processing of the leveling value.

[0025] Further, the single limiting processing of the calculated roll gap adjustment amount comprises:

[0026] The calculated roll gap adjustment amount is compared with a preset single adjustment threshold value ΔS max_single , if ΔS i > ΔS max_single , then ΔS i ' = ΔS max_single , otherwise, ΔS i ' = ΔS i ; wherein, ΔS i represents the calculated roll gap adjustment amount of the i th stand; ΔS i ' represents the roll gap adjustment amount of the i th stand after the single limiting processing.

[0027] Further, the total limiting processing of the leveling value of the roll gap adjustment amount after the single limiting processing comprises:

[0028] For each stand, the current single time limiting processing roll gap adjustment amount and its historical roll gap adjustment amount are accumulated to obtain the accumulated value of the roll gap adjustment amount, and then the accumulated value is compared with the corresponding preset total adjustment threshold value, if ΔS totali > ΔS max_totali , then ΔS i = 0, otherwise, ΔS i = ΔS i ; wherein, ΔS totali represents the accumulated value of the roll gap adjustment amount of the i-th stand, ΔS max_totali represents the corresponding preset total adjustment threshold value of the i-th stand; ΔS i represents the roll gap adjustment amount after total limiting processing of the leveling value; ΔS i represents the single time limiting processing roll gap adjustment amount of the i-th stand; when the roll gap adjustment amount of each stand after limiting processing is issued to the rolling mill to perform roll gap adjustment, ΔS i is issued to the rolling mill to perform roll gap adjustment.

[0029] Further, the method further comprises:

[0030] After the F7 stand bites the steel strip, the wave value of the steel strip at the outlet of the F7 stand is obtained every second preset period, and the average value W α of the current obtained wave value and the historical wave value of the steel strip at the outlet of the F7 stand is calculated.

[0031] If W α ≥ W α_max or W α ≤ W α_min , the wedge control logic is stopped; wherein, W α_min represents the lower limit value of the preset wave reasonable range; W α_max represents the upper limit value of the preset wave reasonable range.

[0032] On the other hand, the present application also provides a wedge control device for stabilizing the steel strip during rolling, comprising:

[0033] A wedge control logic trigger condition judgment module is configured to judge whether to trigger the wedge control logic according to the steel grade, target thickness and deviation value of the steel strip.

[0034] A roll gap adjustment amount determination module is configured to, after triggering the wedge control logic, if the wedge value of the steel strip exceeds the preset wedge value interval, determine the roll gap adjustment amount based on the wedge control model, and issue the determined roll gap adjustment amount to the rolling mill to perform roll gap adjustment.

[0035] The wedge-shaped control logic stop condition judging module is configured to judge whether to stop the wedge-shaped control logic according to the wave shape value of the strip steel after triggering the wedge-shaped control logic.

[0036] In yet another aspect, the present application also provides an electronic device, comprising a processor and a memory; wherein the memory stores at least one instruction, which is loaded and executed by the processor to implement the above method.

[0037] In yet another aspect, the present application also provides a computer readable storage medium, which stores at least one instruction, which is loaded and executed by the processor to implement the above method.

[0038] The technical solution provided by the present application has at least the following beneficial effects:

[0039] The present application can automatically calculate and issue the roll gap adjustment amount for the strip steel wedge-shaped defect calculation according to the steel grade and target thickness of the strip steel, taking into account the deviation value and wave shape value of the strip steel in the stable rolling process, which can effectively improve the asymmetric strip shape of the strip steel while reducing the degree of operator intervention, and improve the stability and safety of the rolling process. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 is a flow chart of the strip steel wedge-shaped control method in the stable rolling process provided by the embodiments of the present application;

[0042] Figure 2 is a partial data screenshot of the steel grade database not performing wedge-shaped control provided by the embodiments of the present application;

[0043] Figure 3 is a schematic diagram of the installation position of the strip steel deviation image acquisition device provided by the embodiments of the present application;

[0044] Figure 4 is a system block diagram of the electronic device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the embodiments of the present application in combination with the drawings.

[0046] First, it should be noted that in the embodiments of the present application, the words such as "exemplarily", "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "exemplary" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "exemplarily" is intended to present the concept in a specific manner. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be either one of the two.

[0047] First embodiment

[0048] In view of the technical problems of serious subjectivity, inaccuracy and low efficiency in the current manual control of the wedge shape, the present embodiment provides a method for controlling the wedge shape of a strip steel in a stable rolling process. The method first communicates the steel grade and target thickness of the strip steel at the first level to determine whether to trigger the wedge shape control. Then, the strip steel deviation value is communicated in real time during the stable rolling process to determine whether to trigger the wedge shape control. If the strip steel deviation value is within the threshold range, the wedge shape control is triggered. The wedge shape value of the strip steel is communicated through the field outlet multifunction instrument. The roll gap adjustment amount is calculated according to the wedge shape control model, and the roll gap adjustment amount is limited according to the field conditions. The limited roll gap adjustment amount is sent to the rolling mill, otherwise the wedge shape control is not triggered. Finally, the strip steel wave value collected by the field outlet multifunction instrument is sent to determine whether to stop sending the roll gap adjustment amount if the wave threshold is exceeded.

[0049] The method can be realized by an electronic device. The execution flow of the method is as shown in Figure 1 , which includes the following steps:

[0050] S1, determining whether to trigger the wedge shape control logic according to the steel grade, target thickness and deviation value of the strip steel;

[0051] Specifically, in the present embodiment, S1 includes the following steps:

[0052] S11, when the flying shear cutting head signal is received, the steel grade and target thickness of the strip steel are communicated at the first level. It is determined from the preset database whether the current steel grade of the strip steel belongs to the steel grade that does not need to be controlled by the wedge shape. If the current steel grade of the strip steel belongs to the steel grade that does not need to be controlled by the wedge shape, the wedge shape control logic is not triggered, otherwise, S12 is executed;

[0053] S12, determining whether the target thickness H of the strip steel is within the preset thickness range. If the target thickness H of the strip steel is not within the preset thickness range, that is, H MAX or H MIN , the wedge shape control logic is not triggered, otherwise, S13 is executed; wherein H MAX , H MINrespectively, maximum and minimum of controllable thickness, set according to on-site rolling experience, unit: mm;

[0054] It should be noted that the wedge control of the strip steel is affected by the steel type and rolling specification, and part of the special steel does not need to be controlled by the wedge. When the thickness of the strip steel is too thin, adjusting the wedge is easy to cause unstable rolling, and when the thickness of the strip steel is too thick, the effect of adjusting the wedge in the finishing mill is not obvious. Therefore, the embodiment establishes a database as shown in the figure to store the steel types of the strip steel that do not need to be controlled by the wedge, so as to judge the wedge control according to the strip steel information. Figure 2 The special steel types in the database are configured according to the actual situation on site, and the embodiment does not make specific limitations on this.

[0055] S13, in the stable rolling process, the strip steel deviation value ΔD n of each stand is obtained in real time, it is judged whether the strip steel deviation value of each stand is within the preset deviation value range, if the strip steel deviation value of each stand is within the preset deviation value range, the wedge control logic is triggered, otherwise, the wedge control logic is not triggered, and an alarm is prompted. The strip steel deviation value ΔD n of each stand is obtained in real time by an industrial camera installed on the top of the stand; the installation position of the camera is shown in the figure. Figure 3

[0056] It should be noted that the wedge of the strip steel is an optimal quality parameter, which should be controlled on the premise of ensuring safety and smooth rolling. For this, the embodiment judges the rolling state of the strip steel according to the deviation value of the strip steel, and then judges whether to trigger the wedge control logic; when the strip steel deviation value of each stand is within the threshold range, that is, ΔD n ∈[-ΔD0, ΔD0], wedge control is performed. When the deviation exceeds the reasonable range, it means that the strip steel has deviated from the rolling center line, at this time, wedge control will aggravate the deviation of the strip steel, and in severe cases, it may even cause the strip steel to hit the side guide plate, and then a steel stacking accident occurs, so no wedge adjustment is made, and an alarm is prompted: the deviation value of the finishing stand exceeds the reasonable range. Wherein, ΔD0 is the reasonable range of deviation, which is set according to the on-site rolling experience, unit: mm.

[0057] S2, after triggering the wedge control logic, if the wedge value of the strip steel exceeds the preset wedge value range, the roll gap adjustment amount is determined based on the wedge control model, and the determined roll gap adjustment amount is sent to the rolling mill for roll gap adjustment;

[0058] Specifically, in the embodiment, the above S2 includes the following steps:

[0059] S21, every 500ms, the wedge value W means obtained by the communication on-site F7 export multifunctional instrument is obtained and judged; ​

[0060] S22, if W means_min ≤W means ≤W means_max , it is considered that the strip wedge value is in the acceptable range and is not controlled; if W means >W means_max or W means W means_min , a wedge control model is used to calculate the roll gap adjustment amount of each stand: wherein, W means_min is a preset lower limit value of the reasonable range of the wedge, W means_max is a preset upper limit value of the reasonable range of the wedge, which is set according to the on-site rolling experience, and the unit is mm;

[0061] The expression of the wedge control model is:

[0062]

[0063] Wherein, ΔS i represents the roll gap adjustment amount of the i-th stand; i is the stand serial number, i = 1, 2, …, 6;

[0064] e is an attenuation coefficient, the set value is 0.95, and the unit is dimensionless;

[0065] S tdi is a stand factor, the set value is S td1 = 1, S td2 = 0.8, S td3 = 0.8, S td4 = 0.6, S td5 = 0.4, S td6 = 0.2, and the unit is dimensionless;

[0066] D m is a critical parameter of the strip wave, the set value is 80, and the unit is dimensionless, which is obtained through finite element simulation;

[0067] h i is the current stand outlet thickness, the unit is mm, and the data is read from PLC;

[0068] W is the F7 outlet width of the strip, the unit is mm, and the data is read from PLC;

[0069] α is a wave factor, the set value is , and the unit is dimensionless, which is obtained through finite element simulation;

[0070] K w is a wedge control coefficient, the set value is 0.5, and the unit is dimensionless, which is obtained through finite element simulation;

[0071] K iThe coefficients for the stands are allocated, and the set values are K1=0.25, K2=0.25, K3=0.15, K4=0.15, K5=0.1, and K6=0.1, which are dimensionless and are set according to the rolling experience on site.

[0072] S23, the roll gap adjustment amounts of each stand calculated by using the wedge-shaped control model are respectively subjected to limiting amplitude processing.

[0073] Specifically, in the present embodiment, the above S23 includes the following steps:

[0074] S231, according to the on-site situation, the calculated roll gap adjustment amount is subjected to single limiting amplitude processing;

[0075] wherein the single limiting amplitude implementation process is: if ΔS i > ΔS max_single , then ΔS i = ΔS max_single .

[0076] S232, the roll gap adjustment amount after the single limiting amplitude processing is subjected to total limiting amplitude processing of the leveling value;

[0077] wherein the total limiting amplitude implementation process of the leveling value is: ΔS totali =∑ΔS i ; if ΔS totali > ΔS max_totali , let ΔS i =0.

[0078] wherein ΔS max_single represents a single adjustment threshold value; ΔS max_totali represents a preset total adjustment threshold value corresponding to the i-th stand; the unit is mm, and the value is set according to the rolling experience on site.

[0079] S24, the roll gap adjustment amount after the limiting amplitude processing is issued to the rolling mill to perform roll gap adjustment.

[0080] Further, it needs to be explained that the above wedge-shaped control model is used to calculate the roll gap adjustment amount according to the wedge shape. Specifically, in the present embodiment, the implementation process is as follows:

[0081] It is assumed that the strip steel is divided into many narrow strips along the width direction, and there is a volume invariance relationship (ignoring the width expansion) for each narrow strip:

[0082] L(x)H(x)=l(x)h(x)

[0083] L(x) and H(x) are the length and thickness of the narrow strip at the inlet side x, respectively;

[0084] l(x) and h(x) are the length and thickness of the narrow strip at the outlet side x, respectively;

[0085] L OS H OS = l OS h OS , L DS H DS = l DS h DS denote the volume relationship of the operating side and the driving side outlet and inlet slits;

[0086] The good flatness condition is:

[0087] l OS = l DS

[0088] Let Δl = l DS - l OS , ΔL = L DS - L OS , where Δl, ΔL represent the flatness of the outlet and inlet respectively;

[0089] w = h DS - h OS , W = H DS - H OS , where w, W represent the wedge of the outlet and inlet respectively;

[0090] L OS H OS = l OS h OS , L DS H DS = l DS h DS Subtracting the two equations gives:

[0091] H DS L DS - H OS L OS = h DS l DS - h OS l OS

[0092] (W + H OS )(ΔL + L OS ) - H OS L OS = (w + h OS )(Δl + l OS ) - h OS l OS

[0093] After ignoring high-order infinitesimal quantities after unfolding, we get:

[0094]

[0095] The condition for good flatness is Δl = 0, ΔL = 0, i.e.:

[0096]

[0097] The above conclusion that the relative wedge shape is constant for the condition of good flatness is strictly true for cold rolling, and the hot continuous rolling weakens the requirement for strictly constant relative wedge shape because the thickness rolled by the first several stands is still thick and the spread exists during rolling. Through finite element simulation of actual working conditions, the following reasonable range of relative wedge shape difference at the entrance and exit of each stand in the finishing rolling process of hot continuous rolling is obtained:

[0098]

[0099] D m The critical parameter for the edge wave of the strip is set to 80, dimensionless, and is obtained through finite element simulation;

[0100] w i , w i-1 are the strip wedge shapes at the exit and entrance of the i-th stand, respectively, with the unit of mm;

[0101] h i , h i-1 are the strip thicknesses at the exit and entrance of the i-th stand, respectively, with the unit of mm;

[0102] e is the attenuation coefficient, set to 0.95, dimensionless, and is obtained through finite element simulation;

[0103] S tdi is the stand factor, set to S td1 = 1, S td2 = 0.8, S td3 = 0.8, S td4 = 0.6, S td5 = 0.4, S td6 = 0.2, dimensionless, and is obtained through finite element simulation;

[0104] W is the width of the strip, with the unit of mm;

[0105] α is the wave shape factor, set to dimensionless, and is obtained through finite element simulation;

[0106] Let the wedge shape at the entrance of the i-th stand at this moment be w i-1 , and the wedge shape to be eliminated be Δw i , then the wedge shape at the exit of the i-th stand is w i = w i-1 - Δw i , and substituting the above formula gives:

[0107]

[0108] In the above formula The maximum wedge value Δw that can be eliminated by the ith stand is negligible i is:

[0109]

[0110] According to the regulation coefficient of the wedge by finite element simulation, the roll gap inclination and the amount of pressure of each stand that needs to be adjusted are:

[0111]

[0112] K w is the wedge regulation coefficient, the set value is 0.5, dimensionless, and is obtained by finite element simulation;

[0113] K i is the stand allocation coefficient, the set values are K1=0.25, K2=0.25, K3=0.15, K4=0.15, K5=0.1, and K6=0.1, dimensionless, and are set according to the rolling experience on site.

[0114] S3, after triggering the wedge control logic, it is judged whether the current wedge control logic is stopped according to the wave value of the strip.

[0115] Specifically, in the embodiment, the implementation process of S3 is as follows: after the F7 bites the steel, the wave value W of the strip is obtained by the multi-functional instrument at the outlet of F7 on site every 1 second α and the average value is calculated, if W α ≥W α_max or W α ≤W α_min , the roll gap adjustment amount ΔS calculated according to the wedge value of the strip is stopped i ; wherein, W α_min is the lower limit value of the reasonable range of the wave; W α_max is the upper limit value of the reasonable range of the wave; the set values are set according to the rolling experience on site, and the unit is IU.

[0116] It should be noted that the theoretical basis of S3 is that the wedge of the strip is an optimal quality parameter, and the control priority is after the wave defect of the strip. Therefore, when the strip itself has a serious wave defect or the wave defect of the strip is aggravated in the process of controlling the wedge, the wedge control should be stopped.

[0117] Next, the application process of the method of the embodiment will be described by taking the F3 stand as an example, and the steps are as follows:

[0118] Step 1: When the flying shear head signal is received, the communication site obtains the steel grade of the strip steel as silicon steel X1300, which is not a steel grade that does not perform wedge control in the database; H MAX = 7 mm, H MIN = 2 mm, the target thickness H is 2.63 mm, which belongs to the thickness control range, triggering the deviation judgment.

[0119] Among them, special steel grades are configured according to actual site conditions; H MAX , H MIN are the maximum and minimum values of the controllable thickness, respectively, which are set according to the rolling experience on site, with the unit of mm.

[0120] Step 2: In the stable rolling process, the real-time deviation values of the strip steel at the outlet of each stand are obtained, among which ΔD1 = -10.371 mm, ΔD2 = -9.910 mm, ΔD3 = -9.921 mm, ΔD4 = -8.483 mm, ΔD5 = -8.809 mm, ΔD6 = -10.024 mm, ΔD7 = -11.730 mm, and ΔD0 = 30 mm is obtained according to the rolling experience on site, the real-time deviation values of the strip steel at the outlet of each stand belong to the reasonable deviation range, triggering the wedge control logic.

[0121] Among them, ΔD1-ΔD7 are the real-time deviation values at the outlet of F1-F7 stands, which are obtained according to the shooting of an industrial camera, with the unit of mm; ΔD0 is the reasonable deviation range, which is set according to the actual rolling experience on site, with the unit of mm.

[0122] Step 3.1: Every 500 ms, the communication site obtains the wedge value W means = 0.080 mm, W means_max = 0.02 mm, W means_min = -0.02 mm, W means > W means_max , which exceeds the maximum value of the reasonable wedge range, and the F3 stand roll gap adjustment amount is calculated according to the wedge control model:

[0123]

[0124] Among them, W means_min , W means_max are the maximum and minimum values of the reasonable wedge range, respectively, which are set according to the rolling experience on site, with the unit of mm;

[0125] e is the attenuation coefficient, with a set value of 0.95, dimensionless;

[0126] S td3 is the F3 stand factor, with a set value of S td3 = 0.8, dimensionless;

[0127] D m The wave initiation critical parameter of the strip steel is set to 80, dimensionless, and is obtained by finite element simulation;

[0128] h3 is the F3 rack outlet thickness, unit: mm, read from PLC, h3 = 11.77 mm;

[0129] W is the F7 outlet width of the strip steel, unit: mm, read from PLC, W = 1422 mm;

[0130] α is the wave factor, set to dimensionless;

[0131] K w is the wedge control coefficient, set to 0.5, dimensionless, and is obtained by finite element simulation;

[0132] K3 is the F3 rack distribution coefficient, set to K3 = 0.15, dimensionless, and is set according to the field rolling experience.

[0133] The specific calculation results are as follows:

[0134]

[0135] Thus, the single roll gap adjustment amount of the F3 rack is calculated to be 0.0288 mm.

[0136] Step 3.2: Set the single limit ΔS according to the field situation max_single = 0.02 mm, and the calculated roll gap adjustment amount is judged for single limit:

[0137] ΔS3 = 0.0288 mm, ΔS3 > ΔS max_single , then ΔS i = ΔS max_single = 0.02 mm;

[0138] The single roll gap adjustment amount of the F3 rack is accumulated to obtain the total adjustment amount ΔS total3 , ΔS total3 = ∑ΔS3 = 0.02 mm, and the total limit ΔS max_total3 = 0.2 mm is set according to the field rolling experience, and the total limit of the adjustment value is judged:

[0139] ΔS total3 ≤ ΔS max_total3 , which does not exceed the total limit, and the adjustment value ΔS3 = 0.02 mm this time.

[0140] Wherein, ΔS max_single , ΔS max_total3 are the single adjustment threshold and the total adjustment threshold of the F3 rack respectively, and are set according to the field rolling experience, unit: mm.

[0141] Step 4: After the F7 bite, communicate the F7 outlet multifunction instrument every 1 second, and at this moment, the communication obtains the wave value W of the strip α is -0.5496 IU, and W is set according to the rolling experience on site α_max = 1 IU, and W α_min = -1 IU, then W α_min ≤ Wα≤ W α_max , the wave value is within a reasonable range, and ΔS3 = 0.02 mm is normally issued.

[0142] wherein W α_max , W α_min are the maximum and minimum values of the wave range, which are set according to the situation on site, and the unit is IU.

[0143] After the strip wedge control method in the stable rolling process of the embodiment is applied to the precision rolling measurement and control automatic deviation correction system of a certain 1580 mm hot continuous rolling mill unit for large-scale industrial application, very significant control effect is obtained. According to the daily report and monthly quality inspection account, after the strip wedge control method in the stable rolling process is adopted, the monthly strip wedge hit rate is increased by more than 3%, and the control effect of the asymmetric shape is effectively improved.

[0144] To sum up, the embodiment provides a strip wedge control method in a stable rolling process. The method can automatically calculate and issue the roll gap adjustment amount calculated for the strip wedge defect according to the steel grade and target thickness of the strip, comprehensively consider the run-off value and wave value of the strip in the stable rolling process, effectively improve the asymmetric shape of the strip, reduce the degree of operator intervention, and improve the stability and safety of the rolling process.

[0145] Second Embodiment

[0146] The embodiment provides a strip wedge control device in a stable rolling process, which comprises the following modules:

[0147] A wedge control logic trigger condition judgment module is configured to judge whether to trigger the wedge control logic according to the steel grade, target thickness and run-off value of the strip.

[0148] A roll gap adjustment amount determination module is configured to, after triggering the wedge control logic, if the wedge value of the strip exceeds the preset wedge value interval, determine the roll gap adjustment amount based on the wedge control model, and issue the determined roll gap adjustment amount to the rolling mill for roll gap adjustment.

[0149] A wedge control logic stop condition judgment module is configured to, after triggering the wedge control logic, judge whether to stop the wedge control logic according to the wave value of the strip.

[0150] It should be noted that the strip wedge control device in the stable rolling process in the embodiment corresponds to the strip wedge control method in the stable rolling process in the first embodiment; functions realized by each functional module in the strip wedge control device in the stable rolling process in the embodiment correspond to each flow step in the strip wedge control method in the stable rolling process in the first embodiment one by one; therefore, details are not described herein.

[0151] Third embodiment

[0152] The embodiment provides an electronic device, such as Figure 4 As shown in the figure, the electronic device comprises a processor and a memory; wherein the processor and the memory can be connected through a communication bus; the memory stores at least one instruction, which is loaded and executed by the processor to realize the method of the first embodiment. In addition, the electronic device can further comprise a transceiver, and the processor and the transceiver can be connected through a communication bus, and the transceiver is used for communicating with other devices.

[0153] Next, the method will be described in detail in combination with Figure 4 The various constituent components of the electronic device will be described in detail:

[0154] The processor is the control center of the electronic device, and the electronic device can comprise a plurality of processors, each of which can be a single-CPU or a multi-CPU. The processor herein can be one processor or a general term of a plurality of processing elements. For example, the processor is one or more central processing units (CPU), which can also be other general-purpose processors, application specific integrated circuits (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as one or more microprocessors (digital signal processors, DSP), or one or more field programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor. The processor can perform various functions of the electronic device by running or executing software programs stored in the memory and calling data stored in the memory.

[0155] In a specific implementation, as an embodiment, the processor can comprise one or more CPUs, for example Figure 4CPU0 and CPU1 shown are, of course, merely illustrative examples.

[0156] The memory is used to store the software program that executes the solution of the present invention, and the processor controls its execution. For specific implementation methods, please refer to the above method embodiments, which will not be repeated here.

[0157] Optionally, the memory may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory may be integrated with the processor or may exist independently, and may be accessed through the interface circuit of the electronic device (…). Figure 4 (Not shown in the image) is coupled to the processor; however, this embodiment of the invention does not impose specific limitations on this.

[0158] The transceiver may include a receiver and a transmitter. Figure 4 (Not shown separately). The receiver is used to implement the receiving function, and the transmitter is used to implement the transmitting function. The transceiver can be integrated with the processor or exist independently, and is connected through the interface circuit of the electronic device (…). Figure 4 (Not shown in the image) is coupled to the processor, and this embodiment of the invention does not specifically limit this.

[0159] In addition, it should be noted that, Figure 4 The structure of the electronic device shown is not intended to limit the device. Actual devices may include more or fewer components than shown, or combine certain components, or have different component arrangements. Furthermore, the technical effects achieved by this electronic device when performing the method of the first embodiment described above can be referenced to the technical effects described in the first embodiment; therefore, they will not be repeated here.

[0160] Fourth embodiment

[0161] The embodiment provides a computer readable storage medium, and at least one instruction is stored in the computer readable storage medium, the instruction is loaded and executed by a processor to implement the method in the first embodiment. The computer readable storage medium can be a ROM, a random access memory, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like. The instruction stored therein can be loaded and executed by the processor in the terminal to implement the method.

[0162] In addition, it should be noted that the present application can be provided as a method, an apparatus or a computer program product. Therefore, the embodiments of the present application can be in the form of entirely or partially hardware embodiments, entirely or partially software embodiments or embodiments combining software and hardware aspects. Moreover, when implemented by using software, the embodiments of the present application can be in the form of a computer program product implemented on one or more computer readable storage media including computer usable program code. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded and executed on a computer, the entire or partial processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (for example, infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center and the like including one or more available medium sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD) or a semiconductor medium. The semiconductor medium can be a solid state disk.

[0163] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams according to the methods, terminal devices (systems) and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, an embedded processor or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device produce a machine that implements the processes specified in the flowcharts and / or block diagrams. Figure 1 The flowcharts and / or block diagrams Figure 1 The apparatuses specified in one flow or multiple flows and / or blocks

[0164] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the Figure 1 function specified in the flow or flows and / or blocks Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flow or flows and / or blocks Figure 1 function specified in the flow or flows and / or blocks Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flow or flows and / or blocks

[0165] It should also be noted that, in the specification, relational terms such as first and second, and the like, can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying that any such entity or action is in any way prior or posterior to the other entity or action, unless specifically stated otherwise. The terms "comprises", "comprising", or any other variations 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 can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Additionally, the term "and / or" includes all combinations of one or more of the associated listed items. In addition, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or" unless specifically indicated otherwise. That is, unless specified otherwise, "or" means "and / or" — both are possible. Furthermore, the term "and / or" is intended to mean an inclusive "and / or" rather than an exclusive "and / or". That is, unless specified otherwise, "and / or" means "one, the other, or both" — any combination is possible. In addition, the characters " / " and " " are generally used to represent "or", but can also mean "and / or", depending on the context. The term "at least one of' means one or more. The term "multiple" means two or more. The term "at least one of' or similar terms means any combination of one or more of the referenced items. For example, at least one of a, b, or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single items or multiple items.

[0166] In addition, it should be understood that the sequence of the above processes does not mean the order of execution in various embodiments of the present application. The execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0167] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0168] In several embodiments provided by the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of functional modules / units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms. The units described as separate components can be or can not be physically separated, and the components displayed as units can be or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment. In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0169] If the method is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0170] Finally, it should be pointed out that the above description is only the preferred embodiments of the present application. It should be noted that although the preferred embodiments of the present application have been described, for those skilled in the art, once the basic creative concept of the present application is known, a number of improvements and refinements can be made without departing from the principles of the present application. These improvements and refinements should also be considered as the protection scope of the present application. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all modifications and variations falling within the scope of the embodiments of the present application.

Claims

1. A method for stabilizing strip wedge control during rolling, applicable to a hot continuous rolling train, characterized in that, The strip wedge control method in the stable rolling process comprises: According to the steel grade, target thickness and run-off value of the strip, it is judged whether to trigger the wedge control logic; After triggering the wedge control logic, if the wedge value of the strip exceeds the preset wedge value interval, the roll gap adjustment amount is determined based on the wedge control model, and the determined roll gap adjustment amount is sent to the rolling mill for roll gap adjustment; After triggering the wedge control logic, it is judged according to the wave value of the strip whether to stop the wedge control logic at present; The expression of the wedge control model is: Wherein, ΔS i represents the roll gap adjustment amount of the i th housing; e represents the preset attenuation coefficient; S tdi represents the preset housing factor corresponding to the i th housing; D m represents the critical parameter of the strip wave; h i represents the exit thickness of the i th housing; W represents the exit width of the F7 housing of the strip; α represents the preset wave factor; K w represents the preset wedge control coefficient; K i represents the preset distribution coefficient corresponding to the i th housing.

2. The method of claim 1, wherein the method further comprises: According to the steel grade, target thickness and run-off value of the strip, it is judged whether to trigger the wedge control logic, comprising: S11, when receiving the flying shear head signal, the steel grade and target thickness of the strip are obtained, it is judged whether the steel grade of the current strip belongs to the steel grade which does not need to be controlled by the wedge, if the steel grade of the current strip belongs to the steel grade which does not need to be controlled by the wedge, the wedge control logic is not triggered, otherwise, S12 is executed; S12, it is judged whether the target thickness of the strip is in the preset thickness interval, if the target thickness of the strip is not in the preset thickness interval, the wedge control logic is not triggered, otherwise, S13 is executed; S13, the run-off value of the strip corresponding to each stand is obtained in real time, it is judged whether the run-off value of the strip corresponding to each stand is in the preset run-off value interval, if the run-off value of the strip corresponding to each stand is in the preset run-off value interval, the wedge control logic is triggered, otherwise, the wedge control logic is not triggered, and an alarm prompt is given.

3. The method of claim 1, wherein the method further comprises: determining a desired strip shape; and determining a desired strip shape error. After triggering the wedge control logic, if the wedge value of the strip exceeds the preset wedge value interval, the roll gap adjustment amount is determined based on the wedge control model, and the determined roll gap adjustment amount is sent to the rolling mill for roll gap adjustment, comprising: Every first preset period, the wedge value W of the F7 rack outlet is acquired means ; If W means_min ≤ W means ≤ W means_max , it is considered that the wedge value of the strip steel is in the acceptable range and is not controlled; if W means > W means_max or W means < W means_min , the roll gap adjustment amount of each stand is calculated by using the wedge control model; wherein, W means_min is the lower limit value of the reasonable range of the wedge, and W means_max is the upper limit value of the reasonable range of the wedge. The roll gap adjustment amount of each stand calculated by the wedge control model is respectively limited in amplitude; The roll gap adjustment amount of each stand after the amplitude limiting is sent to the rolling mill for roll gap adjustment.

4. The method of claim 3, wherein the step of determining the strip shape control parameter is performed by the computer. The roll gap adjustment amount of each stand calculated by the wedge control model is respectively limited in amplitude, comprising: The calculated roll gap adjustment amount is limited in amplitude once; The roll gap adjustment amount after the single amplitude limiting is limited in total amplitude value.

5. The method of claim 4, wherein the step of determining the strip shape control parameter is performed by the computer. The calculated roll gap adjustment amount is limited in amplitude once, comprising: The calculated roll gap adjustment amount is compared with a preset single adjustment threshold value ΔS max_single If ΔS i > ΔS max_single , then ΔS i ' = ΔS max_single , otherwise, ΔS i ' = ΔS i ; wherein ΔS i represents the calculated roll gap adjustment amount of the i th stand; and ΔS i ' represents the roll gap adjustment amount of the i th stand after single amplitude limiting processing.

6. The method of claim 4, wherein the step of determining the strip shape control parameter is performed by the computer. The roll gap adjustment amount after the single amplitude limiting is limited in total amplitude value, comprising: For each stand, the roll gap adjustment value of the current single amplitude limiting processing and the historical roll gap adjustment value are accumulated to obtain the accumulated value of the roll gap adjustment value, and then the accumulated value is compared with the corresponding preset total adjustment threshold value. If ΔS totali > ΔS max_totali , then ΔS i ” = 0, otherwise, ΔS i ” = ΔS i ; wherein, ΔS totali represents the accumulated value of the roll gap adjustment value of the i th stand, ΔS max_totali represents the preset total adjustment threshold value corresponding to the i th stand; ΔS i ” represents the roll gap adjustment value after total limiting processing of the leveling value; and ΔS i ' represents the roll gap adjustment value of the i th stand after single amplitude limiting processing. When the roll gap adjustment values of the stands after amplitude limiting processing are sent to the rolling mill to perform roll gap adjustment, ΔS i ” is sent to the rolling mill to perform roll gap adjustment.

7. The method of claim 1, wherein the method further comprises: determining a desired strip shape; and determining a desired strip shape error. According to the wave value of the strip, it is judged whether to stop the wedge control logic at present, comprising: After the F7 rack bites the steel, every second preset period, the wave value of the strip steel at the F7 rack outlet is obtained, and the average value W of the current obtained wave value and the historical wave value of the strip steel at the F7 rack outlet is calculated α ; If W α ≥ W α_max or W a ≤ W α_min , then stop the wedge control logic; wherein W α_min represents a lower limit value of a preset reasonable range of the wave shape; and W α_max represents an upper limit value of the preset reasonable range of the wave shape.

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