CN113198838B - Target convexity early warning method and system for hot continuous rolling strip steel and industrial control equipment - Google Patents
Target convexity early warning method and system for hot continuous rolling strip steel and industrial control equipment Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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Abstract
The invention discloses a target convexity early warning method for hot continuous rolling strip steel, which comprises the following steps: obtaining a first target convexity value of the hot continuous rolling strip steel, a model set target convexity hot-state value, a model conversion target convexity cold-state value and a plate convexity hit rate; when the model setting target convexity hot-state value is not equal to the model conversion target convexity hot-state value, if the absolute value of the difference between the first target convexity value and the model conversion target convexity cold-state value is less than or equal to a first preset value, and the plate convexity hit rate is greater than or equal to a second preset value, performing first early warning of target convexity resetting; if the absolute value of the difference value is smaller than or equal to a first preset value and the plate convexity hit rate is smaller than a second preset value, second early warning is carried out; if the absolute value of the difference value is larger than the first preset value, third early warning is carried out; the method can avoid the obvious deviation between the actual convexity and the target convexity of the hot continuous rolling strip steel.
Description
Technical Field
The application relates to the technical field of hot continuous rolling control of strip steel, in particular to a target convexity early warning method and system for hot continuous rolling strip steel and industrial control equipment.
Background
At present, in some hot continuous rolling production lines or short-flow rolling production lines with hot cooling instead, when rolling certain special varieties or special specifications (extremely thin or ultra wide) strip steels, obvious deviation occurs between the actual convexity of a series of subsequently rolled hot rolled strip steels and the target convexity issued by a production control three-level system L3 from a certain strip steel, so that the convexity control of the series of subsequently rolled hot rolled strip steels is completely out of control. The problem of out-of-control convexity always restricts the improvement of the quality of the strip steel product, and is very unfavorable for accurately controlling the outlet convexity of the hot-rolled strip steel.
Disclosure of Invention
The invention provides a target convexity resetting early warning method, a target convexity resetting early warning system and industrial control equipment for hot continuous rolling strip steel, and aims to solve or partially solve the technical problem that the strip shape quality of the hot continuous rolling strip steel is influenced by obvious deviation between the actual convexity and the target convexity in the continuous rolling process.
In order to solve the technical problem, the invention provides a target convexity early warning method for hot continuous rolling strip steel, which comprises the following steps:
acquiring a first target convexity value of the hot continuous rolling strip steel, a model set target convexity hot-state value, a model conversion target convexity cold-state value and a plate convexity hit rate;
if the model set target convexity hot-state value is not equal to the model conversion target convexity hot-state value, early warning is carried out on target convexity resetting of the hot continuous rolling strip steel according to the first target convexity value, the model conversion target convexity cold-state value and the plate convexity hit rate, and the method specifically comprises the following steps:
if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is smaller than or equal to a first preset value, and the plate convexity hit rate is larger than or equal to a second preset value, carrying out first early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, carrying out second early warning of target convexity resetting;
and if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is greater than the first preset value, carrying out third early warning of target convexity resetting.
Optionally, the early warning method further includes:
when the model set target convexity hot state value is equal to the model conversion target convexity hot state value, early warning is carried out on the convexity control of the hot continuous rolling strip steel according to the plate convexity hit rate, and the method specifically comprises the following steps:
and if the plate convexity hit rate is smaller than the second preset value, early warning is carried out on the convexity control of the hot continuous rolling strip steel.
Optionally, the obtaining a first target crown value of the hot continuous rolled strip steel specifically includes:
acquiring a target convexity compensation value and a second target convexity value issued by a hot rolling three-stage control system;
and determining the first target convexity value according to the target convexity compensation value and the second target convexity value.
Optionally, the value range of the first preset value is 0.001 to 0.01mm.
Optionally, the board convexity hit rate is a convexity C40 hit rate.
Further, the value range of the second preset value is 95% -96%.
Based on the same inventive concept of the technical scheme, the invention also provides a target convexity early warning system of hot continuous rolling strip steel, which comprises the following steps:
the obtaining module is used for obtaining a first target convexity value, a model set target convexity hot-state value, a model conversion target convexity cold-state value and a plate convexity hit rate of the hot continuous rolling strip steel;
the early warning module is configured to, if the model-set target convexity hot-state value is not equal to the model-conversion target convexity hot-state value, early warn target convexity resetting of the hot continuous rolled strip steel according to the first target convexity value, the model-conversion target convexity cold-state value, and the plate convexity hit rate, and specifically includes:
if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is smaller than or equal to a first preset value, and the plate convexity hit rate is larger than or equal to a second preset value, carrying out first early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, carrying out second early warning of target convexity resetting;
and if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is greater than the first preset value, carrying out third early warning of target convexity resetting.
Optionally, the early warning module is further configured to:
when the model set target convexity thermal state value is equal to the model conversion target convexity thermal state value, early warning is carried out on the convexity control of the hot continuous rolling strip steel according to the plate convexity hit rate, and the method specifically comprises the following steps:
and if the plate crown hit rate is less than the second preset value, early warning is carried out on crown control of the hot continuous rolling strip steel.
Optionally, the obtaining module is specifically configured to:
acquiring a target convexity compensation value and a second target convexity value issued by a hot rolling three-stage control system;
and determining the first target convexity value according to the target convexity compensation value and the second target convexity value.
Based on the same inventive concept of the foregoing technical solutions, the present invention further provides an industrial control device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the method steps in the foregoing technical solutions can be implemented.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a target convexity early warning method of hot continuous rolling strip steel, which judges whether a strip shape control model modifies or resets the target convexity by monitoring whether a set target convexity thermal state value of the model is equal to a model conversion target convexity thermal state value, and if not, the target convexity is reset; at the moment, if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is less than or equal to a first preset value, and the hit rate of the plate convexity is greater than or equal to a second preset value, carrying out first early warning of target convexity resetting; the first early warning is used for reminding the operator: the strip shape control model modifies the original target convexity issued by the L3, but the modification range is not large, the convexity control is approximately normal, and the follow-up rolling condition needs to be noticed; if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, performing second early warning of target convexity resetting; the second early warning is used for reminding the operator: the plate shape control model modifies the original target convexity issued by the L3, although the modification range is not large, the convexity control precision is abnormal, the target convexity is reset, and the processing is required to be carried out as soon as possible; if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is greater than the first preset value, carrying out third early warning of target convexity resetting; the third early warning is used for reminding the operator: the plate shape control model has larger modification range on the original target convexity issued by the L3 and needs to be processed immediately; through the early warning under the three conditions, the intelligent diagnosis and analysis of whether the target convexity is set for modifying the plate shape control model of the hot continuous rolling production line are realized, the rolled hot rolled steel coil can be analyzed, the hot rolled strip steel which is being rolled can also be analyzed, so that the operating personnel can find the plate shape control model in time to reset the target convexity, the actual convexity of a series of hot continuous rolling strip steel which is produced subsequently is prevented from deviating from the target convexity obviously, and a foundation is laid for the accurate control of the plate shape control model in the continuous rolling process.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow chart of a target crown warning method for hot continuous rolling strip steel according to one embodiment of the invention;
FIG. 2 is a schematic diagram of a target crown warning system for hot continuous rolled strip according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a human-computer interaction interface of a target crown warning system of hot continuous rolled strip steel according to another embodiment of the invention;
FIG. 4 illustrates a logic control flow diagram in conjunction with the target crown warning method of FIG. 3 in accordance with another embodiment of the present invention;
FIG. 5 shows a crown control curve for a Q235B strip according to another embodiment of the present invention;
fig. 6 shows a schematic diagram of a target convexity warning human-computer interaction interface of Q235B strip steel according to another embodiment of the invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
The reason is found by researching the problem that the convexity of the hot rolled strip steel is suddenly out of control, namely, the reason is that for the special variety or special specification (extremely thin or ultra wide) strip steel, in the preset calculation of the strip shape control model before the actual rolling process occurs, the strip shape control model often resets the target convexity of the hot continuous rolled strip steel, namely, the target convexity issued by an L3 system and about to roll the strip steel is modified for one time or more times; the factors for modifying the target convexity by the model are as follows: the model parameter setting is not matched with the type and the specification of rolled steel, or wave is caused by that wave is not met between frames, or the parameter setting of a mechanical adjusting mechanism is unreasonable and other factors, so that the target convexity of the strip steel is repeatedly modified in the model setting process before rolling, the strip steel is rolled according to the modified target convexity after setting in the rolling process and cannot be controlled according to the set target issued by L3, the modification process of the target convexity can be continuously accumulated and deteriorated along with the actual rolling, and finally the convexity control precision of a series of hot rolled strip steel is sharply reduced, so that the convexity of the actually produced strip steel is far away from the target and cannot meet the product quality requirement. And the operating personnel in the operating area can not find that the target convexity of the strip steel is modified by the plate shape control model for many times in time, so that the operating personnel can not intervene in time to cause the convexity degradation of a large amount of strip steel.
Based on the research conclusion, in order to solve the problem that the actual plate convexity deviates from the target plate convexity to cause the reduction of the quality of a large number of strip steels due to the fact that the target convexity is repeatedly reset by the strip shape control model, the overall thought of the scheme provided by the invention is as follows:
as shown in fig. 1, a method for warning a target crown of hot continuous rolled strip steel is provided, which includes:
s1: acquiring a first target convexity value, a model set target convexity hot-state value, a model conversion target convexity cold-state value and a plate convexity hit rate of the hot continuous rolling strip steel;
s2: if the model set target convexity hot-state value is not equal to the model conversion target convexity hot-state value, early warning is carried out on target convexity resetting of the hot continuous rolling strip steel according to the first target convexity value, the model conversion target convexity cold-state value and the plate convexity hit rate, and the method specifically comprises the following steps:
if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is smaller than or equal to a first preset value, and the plate convexity hit rate is larger than or equal to a second preset value, carrying out first early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, performing second early warning of target convexity resetting;
and if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is greater than the first preset value, carrying out third early warning of target convexity resetting.
The scheme focuses on judging whether the target convexity issued by an L3 system is modified (or reset) by a plate shape control model, namely, whether the set target convexity hot state value of the model, the model conversion target convexity hot state value, the model conversion target convexity cold state value and the plate convexity hit rate are modified or not is judged by identifying, processing and judging the first target convexity value and the model setting target convexity hot state value, and if the target convexity hot state value is modified and the modification amplitude exceeds a certain numerical value amplitude limit, the problem needs to be alarmed and prompted, so that enough attention of operators is paid, and the problem is prevented from further deteriorating and is converted into a large number of convexity failure accidents of hot rolled strip steel. The above-described embodiments will be described in detail with reference to the following examples.
In an alternative embodiment, for the data acquisition step S1: obtaining a first target convexity value, a model set target convexity hot-state value, a model conversion target convexity cold-state value and a plate convexity hit rate of the hot continuous rolling strip steel, wherein the method specifically comprises the following steps:
data acquisition description:
the method is characterized in that related data of rolled strip steel convexity control are collected within a production time range aiming at different production lines, collected data of various different formats are processed in a standardized mode, invalid data are filtered, and valid data are integrated, analyzed and output.
Description of related data:
data involved in the data acquisition process can be acquired from a hot rolling production control system or a strip shape control system, and the data comprises the following data:
first target convexity value Tarprf: final PDI (Primary Data Input) target convexity;
specifically, the method for obtaining the first target convexity value includes: acquiring a target convexity compensation value and a second target convexity value issued by a hot rolling three-stage control system; and determining the first target convexity value according to the target convexity compensation value and the second target convexity value.
Second target convexity value PDI _ prf: PDI target convexity issued by L3;
target convexity compensation value op _ prf _ off: compensating the PDI target convexity by an operator in the operation area;
therefore, the first target convexity value, which is the sum of the PDI target convexity with the final PDI target convexity being L3 and the operator's compensation for the PDI target convexity (tarrp = PDI _ prf + op _ prf _ off), is a cold state value;
the model sets a target convexity hot state value Intprf: the value is a corresponding value obtained by considering the expansion and contraction with heat (coefficient of thermal expansion) and the convexity compensation value of the strip steel on the basis of the first target convexity Tarprf, is a hot state value (H), and is a set target convexity value which is used when the strip steel is rolled by the plate shape control model;
model transformation target convexity thermal state value finpff (H): the Intprf value is not used in actual control, but the target convexity after being modified by the plate shape control model is a hot state value (H);
model transformation target convexity cold state value Delprf (C): the sheet shape control model calculates a convexity cold state value based on Finpff (H) and the thermal expansion coefficient of the strip steel;
plate convexity hit rate: controlling the precision of the plate convexity; the board shape control system can output various board convexity, such as C40, C60, C100 and the like; for a conventional steel grade, optionally, the plate convexity hit rate is a convexity C40 hit rate; for silicon steel or other special grades of steel, either a C60 crown or a C100 crown may be used.
The hot state values in the above data are the crown values of the strip in the hot rolled state, and the cold state values are the crown values of the strip at room temperature.
After the required parameters are obtained, the data collected and arranged into the standardized and unified format are judged according to S2. The general idea is as follows: judging whether the plate shape control model modifies the first target convexity value tarrprf, if the first target convexity value tarrprf is modified and the modification amplitude exceeds a certain numerical value amplitude limit, alarming and prompting the problem, and causing enough attention of an operator to prevent the problem from further worsening, wherein the specific process is as follows: the inconsistency between the model-set target convexity hot state value Intprf and the model-converted target convexity hot state value finpff is used as a basic condition for judging whether the target convexity is reset, and the occurrence of the convexity resetting problem and the severity of the resetting degree are further judged and warned by combining the deviation amplitude between the first target convexity (final PDI target convexity) and the model-converted target convexity Delprf (C) (both are cold state values) and the plate convexity control precision (such as C40 hit rate).
Optionally, in this embodiment, a value range of the first preset value is 0.001 to 0.01mm, and a value range of the second preset value is 95 to 96%.
Taking 0.01mm as the first preset value and 95.4% as the second preset value as an example, the step S2 is described as follows:
when Intprf is not equal to Finpff, the target convexity of the hot-rolled strip steel is modified by the shape control model, and then the deviation between the first target convexity value Tarrprf and the model conversion target convexity cold state value Delprf is considered according to the following conditions:
if the absolute value of Tarrprf-Delprf is less than or equal to 0.01mm and the hit rate of C40 convexity is more than or equal to 95.4 percent, the problem of the convexity resetting of the strip steel is not serious, but whether the resetting condition of the subsequent rolled strip steel is further worsened needs to be concerned, and at the moment, a first early warning of the target convexity resetting is carried out, so that the warning effect is realized for operating personnel and technicians;
if the absolute value of Tarrprf-Delprf is less than or equal to 0.01mm and the hit rate of C40 is less than 95.4%, a convexity resetting problem influencing the convexity control precision occurs, and at the moment, a second early warning of target convexity resetting is carried out to prompt an operator to process the problem as soon as possible;
if the thickness of the steel strip is greater than 0.01mm, the degree of convexity modified by the model is large, the convexity resetting problem is directly carried out to carry out third early warning, operators are reminded to quickly process the convexity resetting problem, and the situation that a large amount of steel strips are unmatched is avoided.
As an optional mode, the specific modes of the first early warning, the second early warning and the third early warning may be differentiated by using sound, color marking and the like. The second early warning and the third early warning belong to the situation that the control of the plate convexity can be obviously influenced by resetting the convexity, so the same early warning mode can be adopted.
When Intprf = finpff, it is stated that the target crown of the hot-rolled steel strip is not modified by the shape control model, and tarrp = Delprf also holds. In this case, the early warning method provided in this embodiment further includes:
when the model set target convexity thermal state value is equal to the model conversion target convexity thermal state value, early warning is carried out on convexity control of the hot continuous rolling strip steel according to the plate convexity hit rate, and the method specifically comprises the following steps: if the plate convexity hit rate is smaller than the second preset value, early warning is carried out on convexity control of the hot continuous rolling strip steel;
for example, if the hit rate of C40 is more than or equal to 95.4%, the convexity control of the strip steel is judged to be normal and good; if the C40 hit rate is less than 95.4%, the crown control precision of the strip is judged not to be high, but the crown control precision is not caused by target crown resetting, and the situation can be fed back to an operator.
In summary, the embodiment provides a target crown early warning method for hot continuous rolling strip steel, which determines whether a strip shape control model modifies or resets a target crown by monitoring whether a model set target crown thermal state value is equal to a model conversion target crown thermal state value, where unequal specification indicates that the target crown is reset; at the moment, if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is less than or equal to a first preset value, and the plate convexity hit rate is greater than or equal to a second preset value, performing first early warning of target convexity resetting; the first early warning is used for reminding the operator: the plate shape control model modifies the original target convexity issued by the L3, but the modification range is not large, the convexity control is approximate to normal, and the follow-up rolling condition needs to be noticed; if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, carrying out second early warning of target convexity resetting; the second early warning is used for reminding the operator: the plate shape control model modifies the original target convexity issued by the L3, although the modification range is not large, the convexity control precision is abnormal, the target convexity is reset, and the processing is required to be carried out as soon as possible; if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is greater than the first preset value, carrying out third early warning of target convexity resetting; the third early warning is used for reminding the operating personnel: the plate shape control model has larger modification range on the original target convexity issued by the L3 and needs to be processed immediately; through the early warning under the three conditions, the intelligent diagnosis and analysis of whether the target convexity is set for modifying the plate shape control model of the hot continuous rolling production line are realized, the rolled hot rolled steel coil can be analyzed, the hot rolled strip steel which is being rolled can also be analyzed, so that the operating personnel can find the plate shape control model in time to reset the target convexity, the actual convexity of a series of hot continuous rolling strip steel which is produced subsequently is prevented from deviating from the target convexity obviously, and a foundation is laid for the accurate control of the plate shape control model in the continuous rolling process.
Based on the same inventive concept of the previous embodiment, in a further alternative embodiment, as shown in fig. 2, there is provided a target crown warning system for hot continuous rolling strip steel, comprising:
an obtaining module 10, configured to obtain a first target convexity value, a model set target convexity hot state value, a model conversion target convexity cold state value, and a plate convexity hit rate of the hot continuous rolled strip steel;
the early warning module 20 is configured to, if the model-set target convexity hot-state value is not equal to the model-conversion target convexity hot-state value, early warn the target convexity resetting of the hot continuous rolled strip steel according to the first target convexity value, the model-conversion target convexity cold-state value, and the plate convexity hit rate, and specifically includes:
if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is smaller than or equal to a first preset value, and the plate convexity hit rate is larger than or equal to a second preset value, carrying out first early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, carrying out second early warning of target convexity resetting;
and if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is larger than the first preset value, carrying out third early warning of target convexity resetting.
As an optional manner, the early warning module 20 is further configured to:
when the model set target convexity thermal state value is equal to the model conversion target convexity thermal state value, early warning is carried out on the convexity control of the hot continuous rolling strip steel according to the plate convexity hit rate, and the method specifically comprises the following steps:
and if the plate convexity hit rate is smaller than the second preset value, early warning is carried out on the convexity control of the hot continuous rolling strip steel.
As an optional manner, the obtaining module 10 is specifically configured to:
acquiring a target convexity compensation value and a second target convexity value issued by a hot rolling three-stage control system;
and determining the first target convexity value according to the target convexity compensation value and the second target convexity value.
As an optional mode, the early warning scheme is combined, so that a human-computer interaction interface for early warning and diagnosis of the target convexity of the hot continuous rolling strip steel is developed for convenience of analysis and use of operators, and the human-computer interaction interface can be embedded into the control platform as an independent module by depending on the existing intelligent data control platform, so that accurate diagnosis of the strip shape quality problem in the rolling automation process is realized.
The upper part of the man-machine interaction interface is a data selection unit which is provided with a plurality of functional buttons, and the convexity data of a target steel coil can be inquired according to information such as a hot rolling production line, a production date, a steel coil number and the like. In the operation process, data within a time range required by the production line and the production time can be selected for convexity control condition analysis, rolled steel types can be analyzed, a standing book for classification analysis of historical data, problem recording and severity of problems can be formed, band steel which is just set to be rolled can be analyzed, early warning is carried out on the subsequent band steel to be rolled, and continuous deterioration of convexity control in the rolling process can be avoided.
The left lower part of the interface is provided with a convexity curve display unit which automatically displays the convexity of the steel coil in a visualized way;
the lower right part of the interface is Result display (Result) which is used for displaying the key convexity data Result and the early warning Result acquired by the scheme and can early warn the target convexity resetting condition of the appointed steel coil.
When the operator operates, the operator can select any piece of strip steel which wants to pay attention to, after any 'steel coil number' is selected in the interface, the corresponding steel type name, thickness (GRT) and Width (WRT) layers can be automatically displayed, and all the convexity control related data of the roll of strip steel are also displayed in the Result table.
When the target convexity resetting judgment is carried out on any selected coiled strip steel, optionally, the judgment is that the convexity control is normal, namely the hit rate of tarrp = Delprf and C40 is more than or equal to 95.4%, and a green passing signal is displayed;
when the convexity control is approximately normal and the follow-up rolling condition is noticed, namely the absolute value of Tarrf-Delprf is less than or equal to 0.01mm and the C40 convexity hit rate is more than or equal to 95.4 percent, a yellow prompt signal is displayed;
the diagnosis is 'alarm, target convexity is reset', namely | Tarprf-Delprf | is less than or equal to 0.01mm, and the hit rate of C40 convexity is less than 95.4%, or | Tarprf-Delprf | is greater than 0.01mm, and a red alarm signal is displayed;
other than the above three cases, i.e., tarrp = Delprf, C40 hit rate <95.4%, show that "the non-target crown resetting problem causes poor control accuracy".
A detailed logic control diagram of the early warning scheme in combination with the human-computer interaction interface can be seen in fig. 4.
Through the development of an interactive interface, a large amount of expert experience is combined, the manual analysis of the problems in the past is converted into real-time intelligent monitoring, timely early warning and diagnosis are carried out on the convexity problems in the rolling process, the quality problems are accurately controlled and processed, the control level of the product quality process is obviously improved, and the occurrence rate of similar quality problems is effectively avoided and reduced.
Based on the same inventive concept of the previous embodiment, in yet another alternative embodiment, the practical application of the above scheme is described by combining convexity control data of specific steel grades:
taking a batch of Q235B rolled by a certain hot continuous rolling production line as an example, the maximum thickness of the rolled strip is 5mm, the minimum thickness is 1.2mm, and the width is 1250mm. As the thickness of the steel strip is less than 1.8mm, the target convexity is easy to reset by the plate shape control model. The Q235B produced in the batch is diagnosed by adopting the target convexity resetting judgment and diagnosis scheme provided by the invention.
This rolled steel grade Q235B of roll phase, the thickness specification change of rolling is more, includes: 3.5mm- >3mm- >2.5mm- >2mm- >1.8mm- >1.6mm- >1.4mm- >1.2mm- >1.4mm- >1.5mm- >1.6mm- >1.8mm- >1.9mm- >2.0mm- >3.75mm- >4mm- >4.5mm- >5mm, and 42 pieces of steel strip were co-rolled in this batch, the basic cases of thickness variation and crown control being shown in Table 1 and FIG. 5.
TABLE 1 crown control for a batch of Q235B rolls
Note: measprf in Table 1 found the mean convexity values.
As shown in fig. 6, when a production line and a production time period are selected in the intelligent diagnosis interface for convexity resetting and "cal" is clicked, the convexity control condition in the time period is diagnosed and outputted, as shown in the lower left picture of fig. 6. After selecting a certain concerned roll number in the interface, the corresponding steel type name, thickness (GRT), width (WRT) level and convexity control data are displayed at the corresponding positions of the interactive interface of fig. 6.
In the roll period diagnosed in this example, the rolled steel grade Q235B was rolled into 42 pieces, and the crown control trend of these 42 pieces of strip steel is shown in the lower left curve of fig. 6. And (3) diagnosing the strip steel with the coil number of 6010099910048 (block 38) selected from the interface: the final PDI target convexity tarprrf of the strip steel block is 0.05mm (operator intervenes in the target convexity to be 0), the model sets the target convexity hot-state value Intprf to be 0.0396mm, the model conversion target convexity hot-state value finpff (H) is 0.0643mm, and the model conversion target convexity cold-state value Delprf (C) is 0.0765mm. Firstly, the model conversion target convexity thermal state value Finpff (H) is larger than the model setting target convexity thermal state value Intprf (H), which shows that the convexity calculated by the plate shape control model is larger; and secondly, the absolute value of the deviation between the final PDI target convexity tarpf and the model conversion target convexity cold state value Delprf (C) is |0.05-0.0765| =0.0265mm, and the absolute value is far greater than the set deviation amplitude by 0.01mm, so that the target convexity of the strip steel is judged to be reset, and red alarm is carried out, as shown in FIG. 6. As shown in table 1 and fig. 6, the rolled batch Q235B has a serious target crown resetting problem from the 38 th block, and even several steel strips rolled subsequently cannot be twisted, so that the control accuracy is low and the crown control is out of control. Actually, from the 1 st rolled strip, the PDI target crown Tarprf is not equal to the model conversion target crown Delprf, but the deviation is always less than 0.01mm. Therefore, if the second early warning prompt can be carried out and timely processed according to the convexity hit rate of the first strip steel being less than 95.4%, the method is very necessary and important for avoiding the occurrence of subsequent serious problems.
Generally speaking, the scheme can effectively diagnose and analyze the selected roll period, trace the reason of the quality problem, early warn the problem in advance, prompt technicians to make relevant records, track and solve the problem in time, ensure the ordered production, and improve the control efficiency and level of the product quality process.
Based on the same inventive concept of the foregoing embodiments, in yet another alternative embodiment, an industrial control device is further provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, the steps of the warning method in the foregoing embodiments can be implemented.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a target convexity early warning method of hot continuous rolling strip steel, which judges whether a strip shape control model modifies or resets the target convexity by monitoring whether a set target convexity thermal state value of the model is equal to a model conversion target convexity thermal state value, and if not, the target convexity is reset; at the moment, if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is less than or equal to a first preset value, and the hit rate of the plate convexity is greater than or equal to a second preset value, carrying out first early warning of target convexity resetting; the first early warning is used for reminding the operator: the plate shape control model modifies the original target convexity issued by the L3, but the modification range is not large, the convexity control is approximate to normal, and the follow-up rolling condition needs to be noticed; if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, carrying out second early warning of target convexity resetting; the second early warning is used for reminding the operating personnel: the plate shape control model modifies the original target convexity issued by the L3, although the modification range is not large, the convexity control precision is abnormal, the target convexity is reset, and the processing is required to be carried out as soon as possible; if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is larger than the first preset value, carrying out third early warning of target convexity resetting; the third early warning is used for reminding the operating personnel: the plate shape control model has larger modification range on the original target convexity issued by the L3 and needs to be processed immediately; through the early warning under the three conditions, the intelligent diagnosis and analysis of whether the target convexity is set for modifying the plate shape control model of the hot continuous rolling production line are realized, the rolled hot rolled steel coil can be analyzed, the hot rolled strip steel which is being rolled can also be analyzed, so that the operating personnel can find the plate shape control model in time to reset the target convexity, the actual convexity of a series of hot continuous rolling strip steel which is produced subsequently is prevented from deviating from the target convexity obviously, and a foundation is laid for the accurate control of the plate shape control model in the continuous rolling process.
While the preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A target convexity early warning method of hot continuous rolling strip steel is characterized by comprising the following steps:
acquiring a first target convexity value of the hot continuous rolling strip steel, a model set target convexity hot-state value, a model conversion target convexity cold-state value and a plate convexity hit rate;
if the model set target convexity hot state value is not equal to the model conversion target convexity hot state value, warning target convexity resetting of the hot continuous rolling strip steel according to the first target convexity value, the model conversion target convexity cold state value and the plate convexity hit rate, and specifically comprising the following steps of:
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is less than or equal to a first preset value, and the plate convexity hit rate is greater than or equal to a second preset value, carrying out first early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state convexity value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, performing second early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is greater than the first preset value, carrying out third early warning of target convexity resetting;
the first target convexity value is a final original data input target convexity, the model setting target convexity hot state value is a setting target convexity value used by the strip shape control model during strip steel rolling, the model conversion target convexity hot state value is a model setting target convexity hot state value modified by the strip shape control model, and the model conversion target convexity cold state value is a convexity cold state value calculated by the strip shape control model based on the model conversion target convexity hot state value and a strip steel thermal expansion coefficient.
2. The warning method of claim 1, further comprising:
when the model set target convexity hot state value is equal to the model conversion target convexity hot state value, early warning is carried out on the convexity control of the hot continuous rolling strip steel according to the plate convexity hit rate, and the method specifically comprises the following steps:
and if the plate crown hit rate is less than the second preset value, early warning is carried out on crown control of the hot continuous rolling strip steel.
3. The early warning method as claimed in claim 1, wherein the obtaining of the first target crown value of the hot continuous rolled strip specifically comprises:
acquiring a target convexity compensation value and a second target convexity value issued by a hot rolling three-stage control system;
and determining the first target convexity value according to the target convexity compensation value and the second target convexity value.
4. The early warning method as claimed in claim 1, wherein the first preset value ranges from 0.001 mm to 0.01mm.
5. The warning method of claim 1, wherein the board convexity hit rate is a convexity C40 hit rate.
6. The early warning method as claimed in claim 5, wherein the second preset value is in a range of 95% to 96%.
7. The target convexity early warning system of the hot continuous rolling strip steel is characterized by comprising the following components:
the acquiring module is used for acquiring a first target convexity value, a model set target convexity hot state value, a model conversion target convexity cold state value and a plate convexity hit rate of the hot continuous rolled strip steel;
the early warning module is used for early warning the target convexity resetting of the hot continuous rolling strip steel according to the first target convexity value, the model conversion target convexity cold state value and the plate convexity hit rate if the model setting target convexity hot state value is not equal to the model conversion target convexity hot state value, and specifically comprises the following steps:
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is less than or equal to a first preset value, and the plate convexity hit rate is greater than or equal to a second preset value, carrying out first early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is smaller than or equal to the first preset value, and the plate convexity hit rate is smaller than the second preset value, carrying out second early warning of target convexity resetting;
if the absolute value of the difference between the first target convexity value and the cold state value of the model conversion target convexity is greater than the first preset value, carrying out third early warning of target convexity resetting;
the first target convexity value is a final original data input target convexity, the model setting target convexity hot state value is a setting target convexity value used by the strip shape control model during strip steel rolling, the model conversion target convexity hot state value is a model setting target convexity hot state value modified by the strip shape control model, and the model conversion target convexity cold state value is a convexity cold state value calculated by the strip shape control model based on the model conversion target convexity hot state value and a strip steel thermal expansion coefficient.
8. The warning system of claim 7, wherein the warning module is further configured to:
when the model set target convexity thermal state value is equal to the model conversion target convexity thermal state value, early warning is carried out on the convexity control of the hot continuous rolling strip steel according to the plate convexity hit rate, and the method specifically comprises the following steps:
and if the plate convexity hit rate is smaller than the second preset value, early warning is carried out on the convexity control of the hot continuous rolling strip steel.
9. The early warning system of claim 7, wherein the acquisition module is specifically configured to:
acquiring a target convexity compensation value and a second target convexity value issued by a hot rolling three-stage control system;
and determining the first target convexity value according to the target convexity compensation value and the second target convexity value.
10. An industrial control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program is adapted to carry out the method steps of any of claims 1 to 6.
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| CN105013835B (en) * | 2014-04-23 | 2017-06-06 | 宝山钢铁股份有限公司 | Original roll gap establishing method based on roll thermal crown in the rolling of tandem mills strip in razor-thin |
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