CN110125189B - Method for setting target strip shape curve of cold-rolled strip steel and computer equipment - Google Patents
Method for setting target strip shape curve of cold-rolled strip steel and computer equipment Download PDFInfo
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- CN110125189B CN110125189B CN201910527827.0A CN201910527827A CN110125189B CN 110125189 B CN110125189 B CN 110125189B CN 201910527827 A CN201910527827 A CN 201910527827A CN 110125189 B CN110125189 B CN 110125189B
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Abstract
The invention provides a method for setting a target strip shape curve of cold-rolled strip steel and computer equipment. The invention provides a plurality of reference target strip shape curves through the target strip shape curve model, can adapt to the conditions of different downstream processing procedures, steel types, widths and thicknesses of strip steel rolling, is beneficial to improving the subsequent strip shape quality, and stores the preset curve coefficient in the database, thereby realizing full-automatic setting; the temperature compensation curve and the coiling tension compensation curve are determined by combining the on-site measured data, real-time dynamic compensation is carried out, and the compensation accuracy is improved; and the target plate shape distribution is determined through the internal stress balance condition, so that the ideal target object plate shape quality is ensured.
Description
Technical Field
The invention relates to the technical field of plate strip rolling, in particular to a method for setting a target plate shape curve of cold-rolled strip steel and computer equipment.
Background
With the development of economy to high quality in China, industries such as automobiles, household appliances, electronics, war industry, aerospace and the like have more and more severe requirements on the plate shape quality of cold-rolled plates and strips, for example, steel plates for automobiles and tin-plated steel plates generally require the flatness to be about 5IU, and electrical steel plates require the flatness to be within 3 IU. With the improvement of the strength of the cold-rolled sheet strip and the further reduction of the thickness, the problem of shape becomes a main problem in the production process of the cold-rolled sheet strip.
The target strip shape curve is substantially a distribution curve of residual stress in the rolled strip along the width direction of the strip steel, represents the strip shape condition of the rolled strip steel, and reflects the actual strip shape quality expected by a producer. In order to obtain high-quality cold-rolled sheet strip products, modern cold-rolling production enterprises widely adopt an advanced strip shape feedback control system. The current plate shape feedback control system has extremely high control precision, can stably control the flatness deviation within 5IU, but the situation that ideal plate shape quality cannot be obtained is comparatively good because the target plate shape curve is set unreasonably. The reason is mainly that: on one hand, the plate shape feedback control system only provides a limited target plate shape curve, is difficult to adapt to the rolling condition of band steel with different steel types, widths and thicknesses, hardly considers the different requirements of downstream processing procedures on the plate shape, and is difficult to fully exert the processing capacity of a downstream production unit; on the other hand, although the target strip shape curve also considers compensation for temperature distribution unevenness and winding tension distribution unevenness, the coefficients of these compensation curves are generally empirically determined, and a static compensation method for winding tension is often different from the actual situation, and it is difficult to obtain ideal quality of the actual strip shape.
Therefore, a target strip shape curve setting technique capable of obtaining a desired strip shape quality is urgently required.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a target strip shape curve setting technical solution for solving the problem of non-ideal strip shape quality caused by unreasonable target strip shape curve setting in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a method for setting a target strip shape curve of a cold-rolled steel strip, comprising the steps of:
establishing a reference target curve model, a temperature compensation curve model and a coiling tension compensation curve model;
determining a corresponding reference target curve, a temperature compensation curve and a coiling tension compensation curve according to the downstream processing procedure of the strip steel and the actual measurement parameters of the strip steel to obtain a target plate shape curve of the strip steel; and
and determining target plate shape distribution for plate shape feedback control according to the target plate shape curve of the strip steel and the internal stress balance condition.
Optionally, the step of determining a corresponding reference target curve, a corresponding temperature compensation curve, and a corresponding coiling tension compensation curve according to the downstream processing procedure of the strip steel and the measured parameters of the strip steel to obtain a target strip shape curve of the strip steel includes:
determining the reference target curve according to the downstream processing procedure, steel grade, width and thickness of the strip steel;
collecting the transverse temperature distribution of the strip steel, substituting the transverse temperature distribution into the temperature compensation curve model, and determining the temperature compensation curve;
collecting the plate convexity of the strip steel, substituting the plate convexity into the coiling tension compensation curve model, and determining the coiling tension compensation curve; and
and superposing the reference target curve, the temperature compensation curve and the coiling tension compensation curve to obtain a target strip shape curve of the strip steel.
Optionally, the reference target curve model is a sextic polynomial function, and the corresponding calculation formula is as follows:
fbase(x)＝a0+a1x+a2x2+a3x3+a4x4+a5x5+a6x6
wherein f isbase(x) A reference target curve is used for representing the reference target plate shape of the strip steel; x is the normalized width coordinate of the strip steel, and the width center position of the strip steel is taken as the origin of coordinates, wherein x is more than or equal to-1 and less than or equal to 1; a is0～a6Are coefficients.
Optionally, according to the difference of the downstream processing procedure, steel type, width range and thickness range of the strip steel, the coefficients of the reference target curve are respectively assigned, and the values of the coefficients are stored in the database.
Optionally, the step of determining the reference target curve according to the downstream processing procedure, steel grade, width and thickness of the strip steel comprises:
determining a concrete expression form of the reference target curve according to the downstream processing procedure of the strip steel: if the downstream processing procedure is a takeaway commodity roll, the reference target curve is a straight line; if the downstream processing procedure is cover annealing, the reference target curve is a concave center curve; if the downstream processing procedure is continuous hot galvanizing, the reference target curve is a central convex curve; if the downstream processing procedure is continuous annealing, the reference target curve is a central convex curve;
and determining the corresponding position of the strip steel in the database according to the steel grade, width and thickness specification of the strip steel, reading the coefficient value of the corresponding reference target curve, and substituting the coefficient value into the reference target curve model.
Optionally, the temperature compensation curve model is a fourth-order polynomial function, and the corresponding calculation formula is as follows:
fT(x)＝b0+b1x+b2x2+b3x3+b4x4
wherein f isT(x) Compensating the shape of the plate generated by the uneven transverse temperature distribution of the strip steel for a temperature compensation curve; x is the normalized width coordinate of the strip steel, and the width center position of the strip steel is taken as the origin of coordinates, wherein x is more than or equal to-1 and less than or equal to 1; b0～b4Are coefficients.
Optionally, the step of collecting the lateral temperature distribution of the strip steel and substituting the lateral temperature distribution into the temperature compensation curve model to determine the temperature compensation curve includes:
collecting measured values of transverse temperature distribution of the strip steel;
substituting the measured value of the transverse temperature distribution of the strip steel into the following calculation formula to determine the coefficient of the temperature compensation curve corresponding to the strip steel:
fT(x)＝b0+b1x+b2x2+b3x3+b4x4＝αt·[t(x)-t0]×105
wherein alpha istThe linear expansion coefficient of the strip steel is shown; t (x) is the measured temperature corresponding to the normalized width coordinate x; t is t0The measured average temperature of the edge parts at two sides of the width of the strip steel,
and substituting the coefficient of the temperature compensation curve corresponding to the strip steel into the temperature compensation curve model.
Optionally, the coiling tension compensation curve model is a quadratic function, and the corresponding calculation formula is as follows:
wherein f isC(x) Compensating the shape of the strip steel in the coiling process for a coiling tension compensation curve; x is the normalized width coordinate of the strip steel, and the strip steel is obtainedThe width central position of the frame is a coordinate origin, and x is more than or equal to-1 and less than or equal to-1; beta is a model coefficient; c is the ratio of the plate convexity of the strip steel to the thickness of the strip steel; rcIs the reel radius of the coiler; n is the number of layers of the current tape roll; h is the thickness of the strip steel.
Optionally, the step of determining the target strip shape distribution for strip shape feedback control according to the target strip shape curve and the internal stress balance condition of the strip steel includes:
determining a target strip shape curve of the strip steel, and then balancing conditions according to the transverse internal stress of the strip steel
To determine a target strip shape profile for strip shape feedback control, i.e.:
wherein, f (x)i) For the compensated target strip shape of the strip, f (x)i)＝fbase(xi)+fT(xi)+fC(xi)，fbase(xi) For the reference target shape of the strip, fT(xi) To compensate for the profile shape of the strip produced by the transverse temperature profileC(xi) In order to compensate the plate shape caused by the plate convexity of the strip steel in the coiling process; f' (x)i) Is a target profile for profile feedback control; x is the number ofiIs the normalized width coordinate of the corresponding ith area; and N is the total number of the divided areas along the width direction of the strip steel.
In addition, to achieve the above and other related objects, the present invention also provides a computer device for setting a target strip shape curve of a cold-rolled steel strip, the computer device comprising a memory for storing a computer program and a processor for executing the computer program to make the computer device realize the method of any one of the above.
As described above, the method for setting the target strip shape curve of the cold-rolled steel strip according to the present invention has the following advantageous effects:
1) the method has the advantages that multiple reference target plate shape curves are provided through the reference target curve model in the target plate shape curve model, the method can adapt to the rolling condition of strip steel with different steel types, widths and thicknesses, the reference target curve of the strip steel is set reasonably, the subsequent plate shape quality is improved, meanwhile, different requirements of downstream processing procedures on the plate shape are considered, and the processing capacity of a downstream production unit can be fully exerted;
2) the temperature compensation curve and the coiling tension compensation curve are determined by combining the temperature compensation curve model and the coiling tension compensation curve model in the target plate shape curve model and the on-site measured data, real-time dynamic compensation is performed, the compensation accuracy is improved, and the subsequent plate shape quality is favorably improved;
3) and determining the target plate shape distribution for plate shape feedback control through the internal stress balance condition, so that the setting of the target plate shape curve is more reasonable, and the quality of the ideal target object plate shape is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a strip shape feedback control system of a six-roller cold rolling mill.
FIG. 2 is a schematic flow chart of a method for setting a target strip shape curve according to the present invention.
FIG. 3 shows a reference target curve according to an embodiment of the present invention.
FIG. 4 is a graph illustrating a temperature profile compensation according to an embodiment of the present invention.
FIG. 5 shows a coiling tension compensation curve according to an embodiment of the present invention.
FIG. 6 shows a target strip shape curve for strip shape feedback control according to an embodiment of the present invention.
Element number description:
1 strip steel
2 working roll
3 intermediate roll
4 support roller
5 plate-shaped roller
6 target plate shape setting computer
7 plate shape control computer
a plate shape distribution real time signal
b target plate shape curve
c control signal
Detailed Description
As mentioned in the background of the invention, in order to obtain high quality cold rolled sheet strip products, modern cold rolling manufacturers have widely adopted advanced strip shape feedback control systems. Fig. 1 shows a six-roll cold rolling mill equipped with a strip shape feedback control system, which may be a single stand reversing six-roll cold rolling mill or the last stand of a cold continuous rolling mill (including a pickling mill train). The strip shape control method comprises the steps that 1 is strip steel, 2, 3 and 4 are respectively a working roll, a middle roll and a supporting roll, the upper part and the lower part of the strip shape control device are respectively 1, a strip shape roll 5 at the outlet of a rolling mill measures a strip shape distribution real-time signal a and then compares the measured strip shape distribution real-time signal a with a target strip shape curve b output by a target strip shape setting computer 6, the obtained strip shape deviation distribution is sent to a strip shape control computer 7, and after the strip shape control device is processed through a certain mathematical model and a control algorithm, the strip shape control computer 7 sends a control signal c to adjust the states of the inclination of rolls (the working roll 2 and the middle roll 3), the bending of the working roll 2, the bending of the middle roll 3, a sectional cooling.
In the plate shape feedback control system, setting of a target plate shape curve plays a very important role, and is a target of plate shape control, and is a real object plate shape quality expected by an operator. However, because the factors influencing the plate shape in the rolling process are many and extremely complex, if the influence of the factors is neglected and only the target plate shape curve is set to the target plate shape distribution desired by the operator, the target is often difficult to achieve. If in the rolling process, the temperature distribution is uneven along the width direction of the strip steel, the temperature of the central position is higher, and the temperatures of the two sides are lower, so that middle waves to a certain degree appear; if the swell occurring during rolling is controlled, a double-sided wavy shape defect occurs in the completely cooled coil. If the strip steel plate has convexity, the speed difference can occur in the width direction in the coiling process, so that tension difference is caused, and middle waves occur to a certain extent; if such a swell defect is not controlled, the product will exhibit increasingly severe swell defects in the longitudinal direction of the strip.
The current plate shape feedback control system has extremely high control precision, can stably control the flatness deviation within 5IU, but the situation that ideal plate shape quality cannot be obtained is comparatively good because the target plate shape curve is set unreasonably. The reason is mainly that: on one hand, the plate shape feedback control system only provides limited target plate shape curves (such as 10 curves), is difficult to adapt to the rolling conditions of strip steel with different steel types, widths and thicknesses, hardly considers the different requirements of downstream processing procedures on the plate shape, and is difficult to fully exert the processing capacity of a downstream production unit; the selection of the target plate shape curve is manually selected by the experience of an operator, and full-automatic setting is not realized. On the other hand, although the target strip shape curve also considers compensation for temperature distribution unevenness and winding tension distribution unevenness, the coefficients of these compensation curves are generally empirically determined, and a static compensation method for winding tension is often different from the actual situation, and it is difficult to obtain ideal quality of the actual strip shape. The two factors are also the main reasons causing poor application effect of the plate shape feedback control system of a plurality of domestic production enterprises.
Based on this, as shown in fig. 2, the invention provides a method for setting a target strip shape curve of cold-rolled strip steel, which comprises the following steps:
s1, establishing a reference target curve model, a temperature compensation curve model and a coiling tension compensation curve model;
s2, determining a corresponding reference target curve, a temperature compensation curve and a coiling tension compensation curve according to the downstream processing procedure of the strip steel and the actual measurement parameters of the strip steel to obtain a target plate shape curve of the strip steel; and
and S3, determining target plate shape distribution for plate shape feedback control according to the target plate shape curve and the internal stress balance condition of the strip steel.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 6. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention do not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between the explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
Referring to fig. 2, the present invention provides a method for setting a target strip shape curve of a cold-rolled steel strip.
Firstly, before setting a target strip shape curve of a specific certain specification strip steel, executing a step S1, establishing a target strip shape curve model suitable for a plurality of strip steels, wherein the target strip shape curve model comprises a reference target curve model, a temperature compensation curve model and a coiling tension compensation curve model, namely the reference target curve model, the temperature compensation curve model and the coiling tension compensation curve model need to be established, and further the target strip shape curve of the strip steel is divided into a reference target curve and a compensation curve (comprising the temperature compensation curve and the coiling tension compensation curve).
Optionally, the reference target curve model is a sextic polynomial function, and the corresponding calculation formula is as follows:
fbase(x)＝a0+a1x+a2x2+a3x3+a4x4+a5x5+a6x6…………………(1)
wherein f isbase(x) A reference target curve is used for representing the reference target plate shape IU of the strip steel; x is the normalized width coordinate of the strip steel, the width center position of the strip steel is taken as the origin of coordinates, and x is more than or equal to-1 and less than or equal to 1; a is0～a6Are coefficients.
In addition, since the specific reference target curve is related to the downstream processing procedure, steel type, width range and thickness specification of the strip steel, after the reference target curve model is established, according to the difference of the downstream processing procedure, steel type (yield strength range), width range and thickness range of the strip steel, the different downstream processing procedures, steel type (yield strength range), width range and thickness range are divided and grouped, then the coefficients of the reference target curve are assigned respectively, and the values of the coefficients are stored in a database (such as the database of the target strip shape setting computer 6) so as to be convenient for subsequent calling.
Optionally, the temperature compensation curve model is a fourth-order polynomial function, and the corresponding calculation formula is as follows:
fT(x)＝b0+b1x+b2x2+b3x3+b4x4………………………………………(2)
wherein f isT(x) Compensating the shape of a plate IU generated by the uneven transverse temperature distribution of the strip steel for a temperature compensation curve; b0～b4Are coefficients.
Optionally, in the strip steel coiling process, due to the existence of the strip steel convexity, the strip steel profile is convex in the axial direction, so that the coiling radius is unequal in the axial direction, and the strip steel has a speed difference in the transverse direction when being coiled to generate an additional stress, based on which, the coiling tension compensation curve model is a quadratic function, and the corresponding calculation formula is:
wherein f isC(x) Compensating the plate shape IU caused by the plate convexity of the strip steel in the coiling process for a coiling tension compensation curve; beta is a model coefficient; c is the ratio of the plate convexity of the strip steel to the thickness of the strip steel; rcIs the radius of the winding drum of the coiling machine, mm; n is the number of layers of the current tape roll; h is the thickness of the strip steel, mm.
It can be understood that the reference target curve model, the temperature compensation curve model and the coiling tension compensation curve model are mainly obtained by combining theoretical knowledge with prior knowledge, and can have other different function expression forms, which are not described herein again.
Further, the present invention provides a computer apparatus (target strip shape setting computer 6 shown in fig. 1) for setting a target strip shape curve of a cold-rolled steel strip, the computer apparatus comprising: a processor, a memory, a transceiver, a communication interface, and a system bus; the memory and the communication interface are connected with the processor and the transceiver through a system bus and complete mutual communication, the memory is used for storing a computer program, the communication interface is used for communicating with other equipment, and the processor and the transceiver are used for realizing the method for setting the target strip shape curve of the cold-rolled strip steel when executing the computer program.
The system bus can be a peripheral component interconnect standard bus or an extended industry standard structure bus, and the system bus can be divided into an address bus, a data bus, a control bus and the like; the communication interface is used for realizing communication between the database access device and other equipment; the memory may comprise random access memory, and may also include non-volatile memory, such as at least one disk memory; the processor may be a general-purpose processor such as a central processing unit, a network processor, etc., a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components.
Secondly, a target strip shape curve is set for a specific certain specification of the strip steel, step S2 is executed, and a corresponding reference target curve, a temperature compensation curve and a coiling tension compensation curve are determined according to the downstream processing procedure of the strip steel and the actual measurement parameters of the strip steel, so that the target strip shape curve of the strip steel is obtained.
In detail, as shown in fig. 2, the step S2 of obtaining the target strip shape curve of the strip steel according to the target strip shape curve model further includes:
s21, determining the reference target curve according to the downstream processing procedure, steel type, width and thickness of the strip steel;
s22, collecting the transverse temperature distribution of the strip steel, substituting the transverse temperature distribution into the temperature compensation curve model, and determining the temperature compensation curve;
s23, collecting the plate convexity of the strip steel, substituting the plate convexity into the coiling tension compensation curve model, and determining the coiling tension compensation curve; and
and S24, overlapping the reference target curve, the temperature compensation curve and the coiling tension compensation curve to obtain a target strip shape curve of the strip steel.
In more detail, the step S21 of determining the reference target curve further includes:
s211, determining a concrete expression form of the reference target curve according to the downstream processing procedure of the strip steel: 1) if the downstream processing procedure is a takeaway commodity roll, the reference target curve is a straight line; 2) if the downstream processing procedure is cover annealing, the reference target curve is a concave center curve (slight edge wave); 3) if the downstream processing procedure is continuous hot galvanizing, the reference target curve is a central convex curve (slight middle wave); 4) if the downstream processing procedure is continuous annealing, the reference target curve is a central convex curve (slight middle wave);
s212, determining the corresponding position of the strip steel in the database according to the steel grade, the width and the thickness specification of the strip steel, reading the coefficient value of the corresponding reference target curve, and inputting the coefficient value into the reference target curve model, namely formula (1), so as to obtain the reference target curve of the strip steel.
In more detail, the step S22 of determining the temperature compensation curve further includes:
s221, collecting a measured value of the transverse temperature distribution of the strip steel by using an infrared thermometer or an online thermometer arranged in a frame;
s222, substituting the measured value of the transverse temperature distribution of the strip steel into the following calculation formula to determine the coefficient of the temperature compensation curve corresponding to the strip steel:
fT(x)＝b0+b1x+b2x2+b3x3+b4x4＝αt·[t(x)-t0]×105…………………(4)
wherein alpha istThe linear expansion coefficient of the strip steel is shown; t (x) is the measured temperature, deg.C, corresponding to the normalized width coordinate x; t is t0The measured average temperature of the edge parts at two sides of the width of the strip steel,
℃；
and S223, substituting the coefficient of the temperature compensation curve corresponding to the strip steel into the temperature compensation curve model, namely the formula (2).
In step S222, according to the formulas (2) and (4), it can be known that at least five real-time temperature values in the transverse direction (width direction) need to be measured, and the real-time temperature values are substituted into the formula (4) and are simultaneously set as an equation set, so as to obtain the real-time temperature values according to the equationsCalculating the coefficient b0～b4Specific value of (a), and the coefficient b0～b4Substituting the specific value into the temperature compensation curve model, namely formula (2), to obtain the temperature compensation curve of the belt.
In more detail, the step S23 of determining the winding tension compensation curve further includes:
s231, acquiring the plate convexity of the strip steel by using a handheld ultrasonic thickness gauge or an online convexity meter on site, or determining a c value according to a proportional convexity equality principle by using a plate convexity measurement value sent by an upstream hot continuous rolling unit;
and S232, substituting the measured value of the plate convexity of the strip steel into the coiling tension compensation curve model, namely a formula (3), so as to obtain a coiling tension compensation curve corresponding to the strip steel.
The number of layers of the current tape roll is calculated in real time by an L1 basic automation system.
In more detail, the step S24 of determining the compensated target strip shape curve of the strip steel includes: and superposing the reference target curve, the temperature compensation curve and the coiling tension compensation curve to obtain a target strip shape curve of the strip steel after compensation. Namely:
f(x)＝fbase(x)+fT(x)+fC(x)…………………………………………………(5)
wherein, f (x) is a target plate shape curve which represents the target plate shape IU of the strip steel after compensation; f. ofbase(x) A reference target curve is used for representing the reference target plate shape IU of the strip steel; f. ofT(x) Compensating the shape of a plate IU generated by the uneven transverse temperature distribution of the strip steel for a temperature compensation curve; f. ofC(x) And compensating the plate shape IU caused by the plate convexity of the strip steel in the coiling process for a coiling tension compensation curve.
In detail, the step S3 of determining the target strip shape distribution for strip shape feedback control according to the target strip shape curve and the internal stress balance condition of the strip steel includes:
after determining the target strip shape curve of the strip steel, according to the target strip shape curveThe balance condition of the transverse internal stress of the strip steel
To determine a target strip shape profile for strip shape feedback control, i.e.:
wherein, f (x)i) For the compensated target strip shape of the strip, f (x)i)＝fbase(xi)+fT(xi)+fC(xi)，IU；fbase(xi) A reference target plate shape IU of the strip steel; f. ofT(xi) In order to compensate the plate shape IU generated by the uneven transverse temperature distribution of the strip steel; f. ofC(xi) In order to compensate the plate shape IU caused by the plate convexity of the strip steel in the coiling process; f' (x)i) Is a target profile for profile feedback control; x is the number ofiIs the normalized width coordinate of the corresponding ith area; and N is the total number of the divided areas along the width direction of the strip steel.
In one embodiment of the invention, exemplified by a 1450mm five stand six roll cold continuous rolling mill train, 25 gauge segments of ABB contact plate rolls, each 52mm, were provided at the exit of the last stand. The downstream processing steps of the cold rolled product include takeaway commodity coils, hood annealing, continuous hot galvanizing and continuous annealing, and the specific definitions are shown in table 1:
TABLE 1 downstream Process numbering
| Downstream Process | Treatment procedure | |
| 0 | Takeaway commodity roll (Cold hard roll) | |
| 1 | Hood type annealing | |
| 2 | Continuous |
|
| 3 | Continuous annealing |
Meanwhile, the yield strength range of the strip steel is 200 MPa-1000 MPa, the width range of the strip steel is 800 mm-1800 mm, and the thickness range of the strip steel is 0.2 mm-3.0 mm. Dividing the steel grade of the strip steel according to the yield strength, and dividing the steel grade into a grade according to the interval of 50MPa, namely dividing the steel grade into 17 grades in the yield strength range; dividing the width range of the strip steel, wherein the width of the strip steel is divided into a grade according to the interval of 100mm, namely 11 grades in the width range; dividing the thickness range of the strip steel, wherein the thickness of the strip steel is in direct proportion to the size of the divided intervals, namely the larger the thickness is, the larger the interval corresponding to the division is, wherein the minimum division interval is 0.05mm, and the thickness range is divided into 20 grades. The corresponding rating is shown in table 2:
TABLE 2 steel grade and specification of strip steel
| Grade numbering of steel grades | Yield strength split | Width rank numbering | Width division | Thickness grade number | Thickness division |
| 1 | ≤200MPa | 1 | ≤800mm | 1 | ≥3.0 |
| 2 | ≤250MPa | 2 | ≤ |
2 | ≥2.6 |
| 3 | ≤300MPa | 3 | ≤ |
3 | ≥2.3 |
| 4 | ≤350MPa | 4 | ≤ |
4 | ≥2.0 |
| 5 | ≤400MPa | 5 | ≤ |
5 | ≥1.8 |
| 6 | ≤450MPa | 6 | ≤ |
6 | ≥1.6 |
| 7 | ≤500MPa | 7 | ≤ |
7 | ≥1.4 |
| 8 | ≤550MPa | 8 | ≤ |
8 | ≥1.2 |
| 9 | ≤600MPa | 9 | ≤ |
9 | ≥1.0 |
| 10 | ≤ |
10 | ≤ |
10 | ≥0.9mm |
| 11 | ≤700MPa | 11 | ≤1800mm | 11 | ≥0.8mm |
| 12 | ≤750MPa | 12 | ≥0.7mm | ||
| 13 | ≤800MPa | 13 | ≥0.6mm | ||
| 14 | ≤850MPa | 14 | ≥0.5mm | ||
| 15 | ≤900MPa | 15 | ≥0.45mm | ||
| 16 | ≤950MPa | 16 | ≥0.4 |
||
| 17 | ≤ |
17 | ≥0.35mm | ||
| 18 | ≥0.30mm | ||||
| 19 | ≥0.25mm | ||||
| 20 | ≥0.20mm |
According to the downstream processing procedure of the strip steel, the classification of steel grades, width and thickness specifications, a table capable of containing 104720 values of 4 × 17 × 11 × 20 × 7 is established in a database of a target plate shape setting computer 6 so as to store corresponding reference target curve coefficients, and 4 × 17 × 11 × 20 × 14960 different reference target curves can be provided; and then assigning coefficients of the reference target curve respectively.
When a specific strip steel with a certain specification is subjected to reference target curve setting, the corresponding position of the strip steel in the database is determined according to the downstream processing procedure, the yield strength (steel grade), the width and the thickness of the raw material, and the corresponding reference target curve coefficient is read. In the case of a hot dip galvanized steel strip having a yield strength of 275MPa as a raw material and a gauge of 1220 mm. times.0.3 mm (the raw material gauge is 1235 mm. times.2.30 mm) in the downstream processing step, the reference target curve coefficients are shown in Table 3.
The downstream process of Table 3 is continuous hot galvanizing, the yield strength is 275MPa,
specification 1220mm x 0.3mm, reference target curve coefficient
| UNITID | GRADEID | WIDTHID | THICKID | a0 | a1 | a2 | a3 | a4 | a5 | a6 |
| 2 | 3 | 6 | 18 | 0 | 0 | -8 | 0 | -2 | 0 | 0 |
Automatically searching corresponding coefficient values from a database of a target plate shape setting computer 6 according to the serial number of a downstream processing procedure, the steel type of the strip steel, the width and the thickness specification serial number, substituting the coefficient values into a formula (1), wherein a reference target curve can be expressed as:
fbase(x)＝-8x2-2x4
the specific profile of the curve is shown in fig. 3.
The transverse temperature distribution of the strip steel at the outlet of the last stand in the rolling process is measured by adopting a handheld infrared thermometer on site, and the temperatures of five positions are measured, wherein the temperatures are respectively as follows: the side temperature of the belt steel on the drive side was 44.2 ℃, the temperature of 47.6 ℃ at the position distant from 1/4 ℃ on the drive side, the temperature of 50.4 ℃ at the center, the temperature of 47.4 ℃ at the position distant from 1/4 ℃ on the operating side, and the temperature of 44.0 ℃ on the operating side, and the temperature was converted into a flatness distribution according to the formula (4), wherein the linear expansion coefficient α wast＝11.9×10-6And calculating to obtain a temperature compensation curve as follows:
fT(x)＝7.497-0.2777x-15.906x2+0.1587x3+8.4093x4
the specific temperature compensation graph is shown in fig. 4.
Because the upstream hot rolling process does not provide the measured data of the plate crown of the strip steel, the transverse thickness distribution of the strip steel is measured on site by adopting an ultrasonic thickness gauge, 10 coils of strip steel are continuously measured, the plate crown of the strip steel obtained by averaging is 0.002mm, then c is 0.002/0.3 is 0.006667, and according to the formula (3), the model coefficient beta is 0.01, then the coiling tension compensation curve can be written as follows:
roll radius R of known coilerCThe thickness h of the strip is 254mm and 0.3mm, and different winding layer numbers (n) can be used to obtain different winding tension compensation curves, as shown in fig. 5.
The compensated target slab shape curve may be expressed as:
according to the balance condition of transverse internal stress of the strip steel
After processing the above equation, a target profile curve can be obtained as shown in fig. 6, where the number of layers n of tape rolls is 2000.
In conclusion, the invention provides a plurality of reference target plate shape curves through the reference target curve model in the established target plate shape curve model, can adapt to the conditions of strip steel rolling of different downstream processing procedures, steel types, widths and thicknesses, ensures that the reference target curve of the strip steel is set reasonably, is beneficial to improving the subsequent plate shape quality, considers the different requirements of the downstream processing procedures on the plate shape, can give full play to the processing capacity of a downstream production unit, and stores the preset curve coefficient in a database, thereby realizing full-automatic setting; the temperature compensation curve and the coiling tension compensation curve are determined by combining the temperature compensation curve model and the coiling tension compensation curve model in the target plate shape curve model and the on-site measured data, and real-time dynamic compensation is performed, so that the temperature compensation curve and the coiling tension compensation curve of the strip steel are set reasonably, and the compensation accuracy is improved; and finally, determining the target plate shape distribution for plate shape feedback control according to the internal stress balance condition to ensure the ideal target object plate shape quality.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A method for setting a target strip shape curve of cold-rolled strip steel is characterized by comprising the following steps:
establishing a reference target curve model, a temperature compensation curve model and a coiling tension compensation curve model;
determining a corresponding reference target curve, a temperature compensation curve and a coiling tension compensation curve according to the downstream processing procedure of the strip steel and the actual measurement parameters of the strip steel to obtain a target plate shape curve of the strip steel; and
determining target plate shape distribution for plate shape feedback control according to the target plate shape curve of the strip steel and the internal stress balance condition;
before the reference target curve is determined, coefficients of the reference target curve are respectively assigned according to the difference of the downstream processing procedure, the steel type, the width range and the thickness range of the strip steel, and the coefficient values are stored in a database;
then, the step of determining the reference target curve according to the downstream processing procedure of the strip steel and the measured parameters of the strip steel further comprises:
determining a concrete expression form of the reference target curve according to the downstream processing procedure of the strip steel;
and determining the corresponding position of the strip steel in the database according to the steel grade, the width and the thickness of the strip steel, reading the coefficient value of a corresponding reference target curve, and substituting the coefficient value into the reference target curve model to obtain the reference target curve.
2. The method for setting the target plate shape curve of the cold-rolled steel strip as claimed in claim 1, wherein the step of determining the corresponding temperature compensation curve and coiling tension compensation curve according to the downstream processing procedure of the steel strip and the measured parameters of the steel strip to obtain the target plate shape curve of the steel strip comprises:
collecting the transverse temperature distribution of the strip steel, substituting the transverse temperature distribution into the temperature compensation curve model, and determining the temperature compensation curve;
collecting the plate convexity of the strip steel, substituting the plate convexity into the coiling tension compensation curve model, and determining the coiling tension compensation curve; and
and superposing the reference target curve, the temperature compensation curve and the coiling tension compensation curve to obtain a target strip shape curve of the strip steel.
3. The method for setting the target plate shape curve of the cold-rolled steel strip as claimed in claim 2, wherein the reference target curve model is a polynomial function of degree six, and the corresponding calculation formula is:
fbase(x)＝a0+a1x+a2x2+a3x3+a4x4+a5x5+a6x6
wherein f isbase(x) A reference target curve is used for representing the reference target plate shape of the strip steel; x is the normalized width coordinate of the strip steel, and the width center position of the strip steel is taken as the origin of coordinates, wherein x is more than or equal to-1 and less than or equal to 1; a is0～a6Are coefficients.
4. The method of setting a target plate shape curve of a cold-rolled steel strip as claimed in claim 3, wherein the step of determining a concrete expression form of the reference target curve according to a downstream process of the steel strip comprises: if the downstream processing procedure is a takeaway commodity roll, the reference target curve is a straight line; if the downstream processing procedure is cover annealing, the reference target curve is a concave center curve; if the downstream processing procedure is continuous hot galvanizing, the reference target curve is a central convex curve; and if the downstream processing procedure is continuous annealing, the reference target curve is a central convex curve.
5. The method for setting the target plate shape curve of the cold-rolled steel strip as claimed in claim 2, wherein the temperature compensation curve model is a fourth-order polynomial function, and the corresponding calculation formula is:
fT(x)＝b0+b1x+b2x2+b3x3+b4x4
wherein f isT(x) Compensating the shape of the plate generated by the uneven transverse temperature distribution of the strip steel for a temperature compensation curve; x is the normalized width coordinate of the strip steel, and the width center position of the strip steel is taken as the origin of coordinates, wherein x is more than or equal to-1 and less than or equal to 1; b0～b4Are coefficients.
6. The method for setting a target plate shape curve of a cold rolled steel strip as claimed in claim 5, wherein the step of collecting a transverse temperature distribution of the steel strip and substituting it into the temperature compensation curve model to determine the temperature compensation curve comprises:
collecting measured values of transverse temperature distribution of the strip steel;
substituting the measured value of the transverse temperature distribution of the strip steel into the following calculation formula to determine the coefficient of the temperature compensation curve corresponding to the strip steel:
fT(x)＝b0+b1x+b2x2+b3x3+b4x4＝αt·[t(x)-t0]×105
wherein alpha istThe linear expansion coefficient of the strip steel is shown; t (x) is the measured temperature corresponding to the normalized width coordinate x; t is t0Is the edge parts at two sides of the width of the strip steelThe average temperature is measured and the average temperature is measured,
and substituting the coefficient of the temperature compensation curve corresponding to the strip steel into the temperature compensation curve model.
7. The method for setting a target plate shape curve of cold-rolled steel strip according to claim 2, wherein the coiling tension compensation curve model is a quadratic function, and the corresponding calculation formula is:
wherein f isC(x) Compensating the shape of the strip steel in the coiling process for a coiling tension compensation curve; x is the normalized width coordinate of the strip steel, and the width center position of the strip steel is taken as the origin of coordinates, wherein x is more than or equal to-1 and less than or equal to 1; beta is a model coefficient; c is the ratio of the plate convexity of the strip steel to the thickness of the strip steel; rcIs the reel radius of the coiler; n is the number of layers of the current tape roll; h is the thickness of the strip steel.
8. The method for setting the target strip shape curve of the cold rolled steel strip as claimed in claim 1, wherein the step of determining the target strip shape distribution for the strip shape feedback control based on the target strip shape curve of the steel strip and the internal stress balance condition comprises:
determining a target strip shape curve of the strip steel, and then balancing conditions according to the transverse internal stress of the strip steel
To determine a target strip shape profile for strip shape feedback control, i.e.:
wherein, f (x)i) For the compensated target strip shape of the strip, f (x)i)＝fbase(xi)+fT(xi)+fC(xi)，fbase(xi) For the reference target shape of the strip, fT(xi) To compensate for the profile shape of the strip produced by the transverse temperature profileC(xi) In order to compensate the plate shape caused by the plate convexity of the strip steel in the coiling process; f' (x)i) Is a target profile for profile feedback control; x is the number ofiIs the normalized width coordinate of the corresponding ith area; and N is the total number of the divided areas along the width direction of the strip steel.
9. A computer device for the setting of a target strip shape curve of a cold-rolled steel strip, characterized in that the computer device comprises a memory for storing a computer program and a processor for executing the computer program to cause the computer device to carry out the method according to any one of claims 1 to 8.
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| CN111177862B (en) * | 2019-12-13 | 2021-11-16 | 燕山大学 | Incidence rule-based flatness curve coefficient setting method |
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| CN112122358B (en) * | 2020-09-11 | 2021-05-28 | 燕山大学 | Plate shape target curve setting method considering plate shape requirements of subsequent process |
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