Method and system for determining feedback thickness deviation abnormality and roll gap processing during hot rolling

Abstract

The application discloses a method and system for judging feedback thickness difference abnormality and roll gap processing in a hot rolling process, which comprises the following steps: setting an interval range and an abnormality frequency upper limit; after the strip steel is completed, real-time instrument feedback thickness difference is obtained, whether the instrument feedback thickness difference exceeds the interval range is judged, and the frequency of the real-time instrument feedback thickness difference exceeding the interval range is recorded; when the frequency of the recorded instrument feedback thickness difference exceeding the interval range exceeds the abnormality frequency upper limit, it is determined that the instrument feedback thickness difference abnormality occurs at this time; at this time, the roll gap target value is corrected correspondingly. The application is beneficial to solve the problems of abnormal equipment operation caused by the set abnormality, strip steel rolling and the serious thickness difference detection distortion caused by the serious strip steel wave caused by the abnormality of the instrument detection thickness difference feedback in the rolling process, and has a positive significance for improving the rolling stability.

Description

Technical Field

[0001] This invention relates to the field of metallurgical automation control technology, and in particular to a method and system for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling. Background Technology

[0002] In the field of metal rolling, if the mill's preset deviation is large, resulting in severe waviness, poor strip shape, or even strip breakage after threading, or if the cooling water for the strip at the last stand is not purged in time, leaving residual water in the strip inspection area, it will cause abnormal thickness difference feedback from the instruments. If this thickness difference feedback is used for roll gap adjustment, it will exacerbate the rolling situation and may even lead to scrap. Currently, there is little information in the field of metal rolling regarding the effectiveness of instrument thickness difference feedback during rolling. Summary of the Invention

[0003] This invention provides a method and system for judging and processing abnormal thickness difference feedback during hot rolling, so as to judge whether the thickness difference feedback from the instrument is effective during the rolling process, and when the instrument feedback of abnormal thickness difference is made, to judge the corresponding rolling conditions and the current roll gap of the rolling mill, and to process the roll gap accordingly.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] On one hand, the present invention provides a method for judging and handling thickness difference abnormalities and roll gap during hot rolling, the method comprising:

[0006] Set a range for judging whether the thickness difference reported by the instrument is reasonable, and set an upper limit for the number of abnormal occurrences for judging whether the thickness difference reported by the instrument exceeds the range.

[0007] After the strip is threaded, the thickness difference fed back by the instrument is obtained in real time. It is determined whether the thickness difference fed back by the instrument exceeds the range, and the number of times the thickness difference fed back by the instrument exceeds the range is recorded.

[0008] When the number of times the recorded instrument feedback thickness difference exceeds the range of the specified interval exceeds the upper limit of the abnormal number, it is determined that an abnormality has occurred in the instrument feedback thickness difference.

[0009] When an abnormal thickness difference is detected in the instrument feedback, the target value of the roll gap is corrected.

[0010] Furthermore, the correction of the roll gap target value includes:

[0011] Determine whether the current actual roll gap Sact is greater than the set roll gap Sset;

[0012] If the current actual roll gap Sact is greater than the set roll gap Sset, then the roll gap target value Starget is modified to: Starget = Sact + ku × Sset, and remains unchanged after the roll gap reaches the target value; where ku represents the preset roll gap handling coefficient when the actual roll gap is greater than the set roll gap in the case of thickness difference fault.

[0013] If the current actual roll gap Sact is not greater than the set roll gap Sset, then the roll gap target value Starget is modified to: Starget = Sset + kl × Sset, and remains unchanged after the roll gap reaches the target value; where kl represents the preset roll gap handling coefficient when the actual roll gap is not greater than the set roll gap in the case of thickness difference fault.

[0014] Furthermore, the preset roll gap treatment coefficient ku is set to a value range of [0, 0.5].

[0015] Furthermore, the preset roll gap treatment coefficient kl is set to a value range of [0,1].

[0016] On the other hand, the present invention also provides a system for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling, the system comprising:

[0017] The feedback thickness difference anomaly judgment module is used for:

[0018] Set a range for judging whether the thickness difference reported by the instrument is reasonable, and set an upper limit for the number of abnormal occurrences for judging whether the thickness difference reported by the instrument exceeds the range.

[0019] After the strip is threaded, the thickness difference fed back by the instrument is obtained in real time. It is determined whether the thickness difference fed back by the instrument exceeds the range, and the number of times the thickness difference fed back by the instrument exceeds the range is recorded.

[0020] When the number of times the recorded instrument feedback thickness difference exceeds the range of the specified interval exceeds the upper limit of the abnormal number, it is determined that an abnormality has occurred in the instrument feedback thickness difference.

[0021] The roll gap processing module is used to correct the roll gap target value when an abnormal thickness difference is detected by the instrument.

[0022] Furthermore, the roll gap treatment module is specifically used for:

[0023] Determine whether the current actual roll gap Sact is greater than the set roll gap Sset;

[0024] If the current actual roll gap Sact is greater than the set roll gap Sset, then the roll gap target value Starget is modified to: Starget = Sact + ku × Sset, and remains unchanged after the roll gap reaches the target value; where ku represents the preset roll gap handling coefficient when the actual roll gap is greater than the set roll gap in the case of thickness difference fault.

[0025] If the current actual roll gap Sact is not greater than the set roll gap Sset, then the roll gap target value Starget is modified to: Starget = Sset + kl × Sset, and remains unchanged after the roll gap reaches the target value; where kl represents the preset roll gap handling coefficient when the actual roll gap is not greater than the set roll gap in the case of thickness difference fault.

[0026] Furthermore, the preset roll gap treatment coefficient ku is set to a value range of [0, 0.5].

[0027] Furthermore, the preset roll gap treatment coefficient kl has a value range of [0,1].

[0028] In another aspect, the present invention also provides an electronic device comprising a processor and a memory; wherein the memory stores at least one instruction, which is loaded and executed by the processor to implement the above-described method.

[0029] In another aspect, the present invention also provides a computer-readable storage medium storing at least one instruction that is loaded and executed by a processor to implement the above-described method.

[0030] The beneficial effects of the technical solution provided by this invention include at least the following:

[0031] The technical solution provided by this invention can compare and judge the real-time thickness difference in each rolling process by using actual instrument feedback data and a pre-defined reasonable thickness difference range. This allows for the determination of whether the current thickness difference detected by the instrument is abnormal and whether the current rolling status is good. Corresponding emergency measures for the mill roll gap can then be taken and applied to the rolling process of the current block. This effectively solves the problem of abnormal equipment operation caused by severe strip waviness due to abnormal instrument feedback or setting errors during rolling, leading to distorted thickness difference detection. This has a positive impact on improving rolling stability. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the execution flow of the method for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram showing the changes in various monitoring data when judging and responding to thickness difference abnormalities and roll gap treatment methods during the hot rolling process provided in the embodiments of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0036] First Embodiment

[0037] This embodiment provides a method for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling. This method can be implemented using electronic equipment, such as a terminal or a server. The method is illustrated below using a hot rolling finishing mill as an example. Figure 1 As shown, the method includes the following steps:

[0038] S1, define the range [ulim, llim] for judging whether the real-time feedback thickness difference of the instrument is reasonable, define the upper limit of the number of abnormal times the real-time feedback thickness difference of the instrument exceeds the range as nmax, and define the number of times the real-time thickness difference exceeds the range as n; where ulim and llim are the upper and lower limits of the defined reasonable range of thickness difference, respectively, in mm; ulim, llim, and nmax can all be adjusted according to actual production needs. In this embodiment, the upper limit of the reasonable range of thickness difference ulim is defined as 0.3, the lower limit of the reasonable range of thickness difference llim is defined as -0.3, and the upper limit of the number of abnormal times the thickness difference is judged is defined as nmax as 30.

[0039] S2, after the strip is threaded, performs real-time judgment on the thickness difference reported by the instrument, collects the thickness difference dev reported by the instrument, and compares it in real-time with ulim and llim in S1; where dev is in mm.

[0040] S3, whenever dev is greater than ulim or llim, the value of n is incremented;

[0041] S4, determine whether n is greater than the upper limit of the number of thickness difference abnormalities nmax. If it is greater, generate the thickness difference abnormality flag e detected by the instrument in the current rolling process and proceed to S5. If it is less than, repeat S2 to S3. Among them, when n is greater than the upper limit of the number of thickness difference abnormalities nmax, the thickness difference abnormality flag e is set to 1, otherwise it is 0.

[0042] S5, determine whether the current actual roll gap Sact when the instrument detects the thickness difference abnormality mark e is greater than the set roll gap Sset before strip threading. If it is greater, modify the roll gap target value to Sact + ku × Sset with a dynamic delay based on the smoothing time constant Tu, and keep it unchanged; if it is less, modify the roll gap target value to Sset + kl × Sset with a dynamic delay based on the smoothing time constant Tl, and keep it unchanged. Here, Sact and Sset are both in mm, and Tu is the roll gap smoothing transition formula Y(t) = X × (1 - e) / (t + ku × Sset). -t / T The time constant T is in ms, where Y(t) is the output result of roll gap smoothing in mm, X is the input value of roll gap smoothing in mm, t is the roll gap smoothing transition time, t = m × TA in ms, where m is the number of controller execution cycles during roll gap smoothing transition, ku is the processing coefficient for when the actual roll gap is greater than the set roll gap when there is a thickness difference fault, with a value range of [0, 0.5], and kl is the processing coefficient for when the actual roll gap is less than the set roll gap when there is a thickness difference fault, with a value range of [0, 1].

[0043] In this embodiment, as Figure 2 As shown, when the instrument provides real-time feedback on thickness variation fluctuations, the number of times the real-time thickness variation exceeds the defined upper and lower limits of the reasonable range is accumulated. When the accumulated value is greater than the upper limit of the number of thickness variation abnormalities, an instrument-detected thickness variation abnormality flag is generated, and corresponding roll gap processing is performed. Specifically, when n equals 31, it is determined that the number of times the real-time thickness variation exceeds the range n is greater than the upper limit of the number of thickness variation abnormalities nmax, and the instrument-detected thickness variation abnormality flag e is set to 1. Through this determination, it is found that the actual roll gap Sact is less than the set roll gap Sset. The roll gap target value is modified to Sset + kl × Sset with a dynamic delay based on the smoothing time constant Tl. At this time, kl takes the value of 0.2 and remains unchanged after the roll gap reaches the target value.

[0044] In summary, this embodiment provides a method for judging abnormal thickness difference feedback and handling roll gap during hot rolling. This method first defines the range for judging whether the thickness difference is reasonable, and the upper limit for the number of times the real-time thickness difference feedback from the instrument exceeds the reasonable range. After the strip is threaded, the instrument feedback thickness difference is judged in real time. Based on whether the number of times the real-time thickness difference exceeds the defined reasonable range exceeds the upper limit for abnormal numbers, it is determined whether the actual detected thickness difference during the current rolling process is abnormal. If abnormal, the corresponding rolling condition and the current mill roll gap are judged, and the roll gap is handled accordingly under different circumstances. This effectively solves the problem of abnormal equipment operation caused by severe strip waviness due to abnormal instrument feedback or setting abnormalities during the rolling process, resulting in distorted thickness difference detection. This has a positive significance for improving rolling stability.

[0045] Second Embodiment

[0046] This embodiment provides a system for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling. This system includes the following modules:

[0047] The feedback thickness difference anomaly judgment module is used for:

[0048] Set a range for judging whether the thickness difference reported by the instrument is reasonable, and set an upper limit for the number of abnormal occurrences for judging whether the thickness difference reported by the instrument exceeds the range.

[0049] After the strip is threaded, the thickness difference fed back by the instrument is obtained in real time. It is determined whether the thickness difference fed back by the instrument exceeds the range, and the number of times the thickness difference fed back by the instrument exceeds the range is recorded.

[0050] When the number of times the recorded instrument feedback thickness difference exceeds the range of the specified interval exceeds the upper limit of the abnormal number, it is determined that an abnormality has occurred in the instrument feedback thickness difference.

[0051] The roll gap processing module is used to correct the roll gap target value when an abnormal thickness difference is detected by the instrument.

[0052] The system for judging and responding to thickness difference abnormalities and handling roll gaps during the hot rolling process in this embodiment corresponds to the method for judging and responding to thickness difference abnormalities and handling roll gaps during the hot rolling process in the first embodiment described above. The functions implemented by each module in the system for judging and responding to thickness difference abnormalities and handling roll gaps during the hot rolling process in this embodiment correspond one-to-one with the process steps in the method for judging and responding to thickness difference abnormalities and handling roll gaps during the hot rolling process in the first embodiment described above; therefore, they will not be repeated here.

[0053] Third Embodiment

[0054] This embodiment provides an electronic device, which includes a processor and a memory; wherein the memory stores at least one instruction, which is loaded and executed by the processor to implement the method of the first embodiment.

[0055] The electronic device can vary considerably depending on its configuration or performance, and may include one or more processors (central processing units, CPUs) and one or more memories, wherein the memories store at least one instruction that is loaded by the processor and executed in accordance with the above method.

[0056] Fourth embodiment

[0057] This embodiment provides a computer-readable storage medium storing at least one instruction, which is loaded and executed by a processor to implement the method of the first embodiment described above. The computer-readable storage medium may be a ROM, random access memory, CD-ROM, magnetic tape, floppy disk, or optical data storage device, etc. The instruction stored therein can be loaded and executed by a processor in a terminal.

[0058] Furthermore, it should be noted that the present invention can be provided as a method, apparatus, or computer program product. Therefore, embodiments of the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code.

[0059] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0060] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0061] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0062] Finally, it should be noted that the above description represents a preferred embodiment of the present invention. It should be pointed out that although preferred embodiments have been described, those skilled in the art, once they understand the basic inventive concept of the present invention, can make various improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. A method for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling, characterized in that, The methods for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling include: Set a range for judging whether the thickness difference reported by the instrument is reasonable, and set an upper limit for the number of abnormal occurrences for judging whether the thickness difference reported by the instrument exceeds the range. After the strip is threaded, the thickness difference fed back by the instrument is obtained in real time. It is determined whether the thickness difference fed back by the instrument exceeds the range, and the number of times the thickness difference fed back by the instrument exceeds the range is recorded. When the number of times the recorded instrument feedback thickness difference exceeds the range of the specified interval exceeds the upper limit of the abnormal number, it is determined that an abnormality has occurred in the instrument feedback thickness difference. When an abnormal thickness difference is detected in the instrument feedback, the target value of the roll gap is corrected. The correction of the roll gap target value includes: Determine the current actual roll gap Sact Is it larger than the set roll gap? Sset ; If the current actual roll gap Sact Larger than the set roll gap Sset The roll gap target value will then be based on the smoothing time constant. Tu The dynamic delay was modified to Sact + ku × Sset And remain unchanged; if the current actual roll gap Sact Not greater than the set roll gap Sset The roll gap target value will then be based on the smoothing time constant. Tl The dynamic delay was modified to Sset + kl × Sset And remain unchanged; among them, Sact , Sset All units are mm , Tu Formula for smooth transition of roll gap Y(t) = X × (1 − e -t / T ) time constant T The unit is ms, in Y(t) For the output result of roll gap smoothing, the unit is mm , X Input value for roll gap smoothing, unit: mm , t Time is used to allow for a smooth transition between roll gaps. t = m × TA The unit is ms ,in m The number of controller cycles during smooth transition of the roll gap. ku This refers to the handling coefficient for cases where the actual roll gap is greater than the set roll gap when there is a thickness difference fault. kl The handling coefficient for when the actual roll gap is less than the set roll gap in the case of thickness difference fault.

2. The method for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling as described in claim 1, characterized in that, Preset roller gap treatment coefficient ku The value range is [0, 0.5].

3. The method for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling as described in claim 1, characterized in that, Preset roller gap treatment coefficient kl The value range is [0,1].

4. A system for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling, characterized in that, The hot rolling process includes a system for judging and responding to thickness difference abnormalities and for handling roll gaps, which includes: The feedback thickness difference anomaly judgment module is used for: Set a range for judging whether the thickness difference reported by the instrument is reasonable, and set an upper limit for the number of abnormal occurrences for judging whether the thickness difference reported by the instrument exceeds the range. After the strip is threaded, the thickness difference fed back by the instrument is obtained in real time. It is determined whether the thickness difference fed back by the instrument exceeds the range, and the number of times the thickness difference fed back by the instrument exceeds the range is recorded. When the number of times the recorded instrument feedback thickness difference exceeds the range of the specified interval exceeds the upper limit of the abnormal number, it is determined that an abnormality has occurred in the instrument feedback thickness difference. The roll gap processing module is used to correct the roll gap target value when an abnormal thickness difference is detected by the instrument. The roll gap treatment module is specifically used for: Determine the current actual roll gap Sact Is it larger than the set roll gap? Sset ; If the current actual roll gap Sact Larger than the set roll gap Sset The roll gap target value will then be based on the smoothing time constant. Tu The dynamic delay was modified to Sact + ku × Sset And remain unchanged; if the current actual roll gap Sact Not greater than the set roll gap Sset The roll gap target value will then be based on the smoothing time constant. Tl The dynamic delay was modified to Sset + kl × Sset And remain unchanged; among them, Sact , Sset All units are mm , Tu Formula for smooth transition of roll gap Y(t) = X × (1 − e -t / T ) time constant T The unit is ms, in Y(t) For the output result of roll gap smoothing, the unit is mm , X Input value for roll gap smoothing, unit: mm , t Time is used to allow for a smooth transition between roll gaps. t = m × TA The unit is ms ,in m The number of controller cycles during smooth transition of the roll gap. ku This refers to the handling coefficient for cases where the actual roll gap is greater than the set roll gap when there is a thickness difference fault. kl The handling coefficient for when the actual roll gap is less than the set roll gap in the case of thickness difference fault.

5. The system for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling as described in claim 4, characterized in that, Preset roller gap treatment coefficient ku The value range is [0, 0.5].

6. The system for judging and responding to thickness difference abnormalities and handling roll gaps during hot rolling as described in claim 4, characterized in that, Preset roller gap treatment coefficient kl The value range is [0,1].

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