CN112364460A - Method and device for analyzing thermal expansion of roller and storage medium - Google Patents
Method and device for analyzing thermal expansion of roller and storage medium Download PDFInfo
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Abstract
The invention provides a method, a device and a storage medium for analyzing thermal expansion of a roller, wherein the method is applied to a hot continuous rolling production line and comprises the following steps: determining the thermal expansion amount of each frame roller when rolling each strip steel based on the attribute information of each frame roller when rolling each strip steel and a preset thermal expansion amount prediction model; determining N rolling periods contained in the hot continuous rolling process based on the thermal expansion amount of each frame roller when rolling each strip steel, wherein N is a positive integer; and determining whether the thermal expansion amount of each stand roller converges or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled. According to the scheme, each roll period in the hot continuous rolling production line can be automatically identified, the thermal expansion amount of each rack roll in each roll period is analyzed and diagnosed, and a precondition guarantee is provided for quality control of subsequent products.
Description
Technical Field
The invention relates to the technical field of rolling, in particular to a method and a device for analyzing thermal expansion of a roller and a storage medium.
Background
At present, quality problems left by all working procedures in the steel industry generally belong to the multivariable coupling problem, an existing system lacks efficient quality diagnosis, analysis and optimization technology, and the root cause of the problems is difficult to find through simple threshold analysis and comparative analysis, so that the quality defects occur frequently and repeatedly. The information physical system aims at networking physical equipment, namely, interconnecting the equipment, and enabling the physical equipment to have the functions of calculation, communication, accurate control, remote coordination, autonomy and the like. The interconnected system is used for steel enterprises, and the main point and the foothold of the interconnected system are the quality control of products. The technology is a technology which is used as an independent module embedded information physical system on the basis of developing an intelligent data management and control platform, so that the quality problem of the rolling automation process is accurately diagnosed.
In the prior art, in the process of producing strip steel by a hot continuous rolling production line, rollers of all frames generate thermal expansion, and if the thermal expansion of the rollers is in an unreasonable or unstable state, the quality problem of the rolled strip steel can be caused. However, the thermal expansion of the roller cannot be measured in real time in the rolling process, so that the thermal expansion of the roller cannot be detected and controlled, and further the subsequent product quality has hidden troubles.
Disclosure of Invention
The embodiment of the specification provides a method and a device for analyzing thermal expansion of a roller and a storage medium.
In a first aspect, the present invention provides a method for analyzing thermal expansion of a roller, which is applied to a hot continuous rolling production line, and is characterized in that the method includes:
determining the thermal expansion amount of each frame roller when rolling each strip steel based on the attribute information of each frame roller when rolling each strip steel and a preset thermal expansion amount prediction model;
determining N rolling periods contained in the hot continuous rolling process based on the thermal expansion amount of each frame roller when rolling each strip steel, wherein N is a positive integer;
and determining whether the thermal expansion amount of each stand roller converges or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled.
Optionally, the determining N rolling periods included in the hot continuous rolling process based on the thermal expansion amount of each stand roller when rolling each strip steel includes:
when the thermal expansion amount of each rack roller in the process of rolling the target strip steel is detected to meet a first preset range, determining the target strip steel as the first strip steel in the target roller period;
for each frame roller, when the difference between the thermal expansion amount of the frame roller when rolling the upper strip steel and the thermal expansion amount of the frame roller when rolling the lower strip steel meets a second preset range, determining the upper strip steel as the last strip steel of the target roller period;
and determining the target roll period based on the first strip steel and the last strip steel.
Optionally, the determining, for each roll period of the N rolling roll periods, whether the thermal expansion amount of each stand roll converges based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period includes:
determining the difference value of the thermal expansion amount of the target frame roller when the target frame roller rolls two adjacent strip steels in each roller period;
determining whether the thermal expansion amount of the target frame roller is in a stable state in the roller period based on the thermal expansion amount difference value of two adjacent rolled strip steels;
determining a target amount of thermal expansion of the target stand roll in the steady state when the target amount of thermal expansion of the target stand roll is in the steady state in the roll period, and determining whether the amount of thermal expansion of the target stand roll in the roll period converges based on the target amount of thermal expansion.
Optionally, the determining whether the thermal expansion of the target stand roller is in a stable state in the roller period based on the thermal expansion difference between two adjacent rolled steel strips includes:
numbering each strip steel in the roll period;
when M pieces of strip steel in the roll period of continuous rolling of a target frame roller are detected for the first time, the difference value of the thermal expansion amounts of any two adjacent pieces of strip steel in the M pieces of strip steel meets a third preset range, the target number of the previous piece of strip steel in the M pieces of strip steel is determined, and M is an integer greater than 1;
and determining whether the target number meets a fourth preset range, and if the target number does not meet the fourth preset range, determining that the thermal expansion amount of the target frame roller is in a stable state in the roller period.
Optionally, the determining, when the thermal expansion amount of the target stand mill roll is in a stable state in the roll period, a target thermal expansion amount of the target stand mill roll in the stable state, and determining whether the thermal expansion amount of the target stand mill roll in the roll period converges based on the target thermal expansion amount includes:
taking the average value of the thermal expansion amount of the target frame roller in the stable state when rolling each strip steel as the target thermal expansion amount;
and when the target thermal expansion amount meets a fifth preset range, determining that the thermal expansion amount of the target frame roller is converged.
Optionally, after determining whether the thermal expansion amount of each stand roller converges, the method further includes:
and if the thermal expansion amount of each frame roller is not converged, adjusting the target parameters of the frame rollers with the non-converged thermal expansion amounts.
Optionally, after the determining N rolling periods included in the hot continuous rolling process, the method further includes:
determining the type of the rolled steel strip in each roll period;
configuring parameters for judging whether the thermal expansion amount of each stand roller is converged in each roller period based on the type of the rolled strip steel in each roller period;
the determining, for each of the N rolling mill periods, whether the thermal expansion amount of each stand roll converges based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period includes:
and for each roll period, determining whether the thermal expansion amount of each frame roll converges or not based on the thermal expansion amount of each frame roll in the roll period when rolling each strip steel and the parameter used for judging whether the thermal expansion amount of each frame roll converges or not in the roll period.
In a second aspect, an embodiment of the present disclosure provides a device for analyzing thermal expansion of a roller, which is applied to a hot continuous rolling production line, and the device includes:
the prediction module is used for determining the thermal expansion amount of each rack roller when rolling each strip steel based on the attribute information of each rack roller when rolling each strip steel and a preset thermal expansion amount prediction model;
the roll period determining module is used for determining N rolling roll periods contained in the hot continuous rolling process based on the thermal expansion amount of each frame roller when rolling each strip steel, wherein N is a positive integer;
and the convergence determining module is used for determining whether the thermal expansion amount of each stand roller is converged or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled.
Optionally, the roll period determination module is configured to:
when the thermal expansion amount of each rack roller in the process of rolling the target strip steel is detected to meet a first preset range, determining the target strip steel as the first strip steel in the target roller period;
for each frame roller, when the difference between the thermal expansion amount of the frame roller when rolling the upper strip steel and the thermal expansion amount of the frame roller when rolling the lower strip steel meets a second preset range, determining the upper strip steel as the last strip steel of the target roller period;
and determining the target roll period based on the first strip steel and the last strip steel.
Optionally, the convergence determining module is configured to:
determining the difference value of the thermal expansion amount of the target frame roller when the target frame roller rolls two adjacent strip steels in each roller period;
determining whether the thermal expansion amount of the target frame roller is in a stable state in the roller period based on the thermal expansion amount difference value when two adjacent pieces of strip steel are rolled;
determining a target amount of thermal expansion of the target stand roll in the steady state when the target amount of thermal expansion of the target stand roll is in the steady state in the roll period, and determining whether the amount of thermal expansion of the target stand roll in the roll period converges based on the target amount of thermal expansion.
Optionally, the convergence determining module is configured to:
numbering each strip steel in the roll period;
when M pieces of strip steel in the roll period of continuous rolling of a target frame roller are detected for the first time, the difference value of the thermal expansion amounts of any two adjacent pieces of strip steel in the M pieces of strip steel meets a third preset range, the target number of the previous piece of strip steel in the M pieces of strip steel is determined, and M is an integer greater than 1;
and determining whether the target number meets a fourth preset range, and if the target number does not meet the fourth preset range, determining that the thermal expansion amount of the target frame roller is in a stable state in the roller period.
Optionally, the convergence determining module is configured to:
taking the average value of the thermal expansion amount of the target frame roller in the stable state when rolling each strip steel as the target thermal expansion amount;
and when the target thermal expansion amount meets a fifth preset range, determining that the thermal expansion amount of the target frame roller is converged.
Optionally, the apparatus further comprises:
and the adjusting module is used for adjusting the target parameters of the stand rollers with unconverged thermal expansion amount if the thermal expansion amount of each stand roller is not converged.
Optionally, the apparatus further comprises:
the strip steel type determining module is used for determining the type of the strip steel rolled in each roll period;
the parameter configuration module is used for configuring parameters used for judging whether the thermal expansion amount of each frame roller is converged in each roller period based on the type of the strip steel rolled in each roller period;
and the convergence determining module is used for determining whether the thermal expansion amount of each frame roller is converged or not according to the thermal expansion amount of each frame roller in the rolling period and the parameter for judging whether the thermal expansion amount of each frame roller is converged or not in the rolling period aiming at each roller period.
In a third aspect, an embodiment of the present specification provides a roll thermal expansion analysis apparatus, which is characterized by comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of any one of the methods when executing the program.
In a fourth aspect, the present specification provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of any of the above methods.
The beneficial effects of the embodiment of the specification are as follows:
in the technical scheme of the embodiment of the invention, in a hot continuous rolling production line, the thermal expansion amount of each stand roller in the process of rolling each strip steel is determined based on the attribute information of each stand roller in the process of rolling each strip steel and a preset thermal expansion amount prediction model, N rolling roller periods included in the hot continuous rolling process are determined based on the thermal expansion amount of each stand roller in the process of rolling each strip steel, and whether the thermal expansion amount of each stand roller is converged is determined based on the thermal expansion amount of each stand roller in the rolling roller period for each roller period. By the method, each roll period in the hot continuous rolling production line can be accurately and automatically identified, the thermal expansion of the stand rolls in each roll period is analyzed and diagnosed, the detection and control of the thermal expansion of the rolls are realized, and preconditions are provided for quality control of subsequent products.
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 specification. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method for analyzing thermal expansion of a roll according to a first aspect of the present application;
FIG. 2 is a schematic representation of the amount of thermal expansion of the rolls of each stand during a roll stand as a function of the amount of rolled strip provided by the present application;
FIG. 3 is a flow chart of another method of analyzing roll thermal expansion provided herein;
FIG. 4 is a schematic view of a roll thermal expansion analysis interface provided herein;
fig. 5 is a schematic view of a roll thermal expansion analysis apparatus according to a second aspect of the present application.
Detailed Description
The embodiment of the invention provides a method, a device and a storage medium for analyzing the thermal expansion of a roller, which are used for automatically identifying each roller period in a hot continuous rolling production line, analyzing and diagnosing the thermal expansion amount of each rack roller in each roller period and providing a precondition guarantee for the quality control of subsequent products. The method is applied to a hot continuous rolling production line, and the thermal expansion amount of each rack roller when rolling each strip steel is determined based on the attribute information of each rack roller when rolling each strip steel and a preset thermal expansion amount prediction model; determining N rolling periods contained in the hot continuous rolling process based on the thermal expansion amount of each frame roller when rolling each strip steel, wherein N is a positive integer; and determining whether the thermal expansion amount of each stand roller converges or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled.
The technical solutions of the present invention are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present invention are described in detail in the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In a first aspect, the present invention provides a method for analyzing thermal expansion of a roll, the method being applied to a hot continuous rolling production line, the hot continuous rolling production line being capable of rolling a strip steel through a multi-stand continuous rolling mill set, such as a seven-stand continuous rolling mill set, as shown in fig. 1, the method comprising the steps of:
step S11: determining the thermal expansion amount of each frame roller when rolling each strip steel based on the attribute information of each frame roller when rolling each strip steel and a preset thermal expansion amount prediction model;
step S12: determining N rolling periods contained in the hot continuous rolling process based on the thermal expansion amount of each strip steel rolled by each frame roller, wherein N is a positive integer;
step S13: and determining whether the thermal expansion amount of each stand roller converges or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled.
In step S11, since the thermal expansion amount of the roll is related to various factors, the attribute information of the roll of each stand may include material information, density information, specific heat information, and the like of the roll. In addition, in the process of rolling the strip steel, the strip steel is in contact with the rollers to transfer heat, and accordingly, a certain thermal expansion amount is brought to the rollers, so that heat flow information transferred by heat conduction information, heat convection information, heat radiation and the like between the strip steel and the rollers can be used as attribute information of the rollers of each stand when rolling the strip steel.
The preset thermal expansion prediction model can be a pre-trained model, and is used for predicting the thermal expansion of the rollers of each stand in the process of hot continuous rolling when rolling strip steel. When the thermal expansion amount is predicted, the attribute information of each stand roller may be used as an input of a preset thermal expansion amount prediction model, and the thermal expansion amount of each stand roller may be output.
In the specific implementation process, taking rolling of a piece of strip steel as an example, the attribute information of each stand roller when rolling the piece of strip steel is acquired, taking a seven-stand continuous rolling unit as an example, the attribute information of the F1 stand roller when rolling the piece of strip steel, the attribute information of the F2 stand roller when rolling the piece of strip steel, and the attribute information of the F7 stand roller when rolling the piece of strip steel are sequentially acquired, and 7 sets of attribute information are acquired. And respectively inputting each group of attribute information into a preset thermal expansion prediction model to obtain the thermal expansion of the F1 stand roller when rolling the strip steel, the thermal expansion of the F2 stand roller when rolling the strip steel, and the thermal expansion of the … and the F7 stand roller when rolling the strip steel.
When rolling a plurality of pieces of strip steel, attribute information of the mill rolls of each stand needs to be sequentially obtained in real time, and thermal expansion amount of the mill rolls of each stand when rolling each piece of strip steel is obtained based on a preset thermal expansion amount prediction model. Fig. 2 is a schematic diagram showing the variation of the thermal expansion amount of the rolls of each stand according to the number of rolled steel strips in one roll period in the embodiment of the present specification. In fig. 2, taking a seven-stand continuous rolling mill train as an example, as shown in the figure, the thermal expansion amounts of the stands are F2, F1, F4, F7, F3, F6, and F5 in this order from large to small at the end of the rolling in the rolling period.
In the embodiment of the present specification, the thermal expansion amounts of the strip steel and the stand rollers may be related to each other, for example, how many the thermal expansion amounts of the stand rollers are in sequence when the strip steel 1 is rolled, and how many the thermal expansion amounts of the stand rollers are in sequence when the strip steel 2 is rolled, and the correspondence relationship may be recorded to form the mapping relationship.
In addition, the input data of the preset thermal expansion amount prediction model can be set according to actual needs. As described above, the attribute information of the rolls may be used as the input data of the model, and other information and the attribute information of the rolls may be used together as the input data of the model, for example, the environmental information of the rolls of each stand in the hot continuous rolling process is acquired, and the attribute information and the environmental information may be used as the input data of the model.
In the embodiment of the description, after the thermal expansion amount of each stand roller when rolling each strip steel is obtained, the thermal expansion amount of each stand roller is analyzed, and in the specific implementation process, the analysis of the thermal expansion amount includes two parts: a roll period identification part and a roll period diagnosis part. Wherein the roll period identifying part is implemented through step S12, and the roll period diagnosing part is implemented through step S13.
In step S12, when rolling a certain number of steel strips, a plurality of rolling periods may be included, and N rolling periods in the rolling process are determined in step S12. The method can be realized by the following steps: when the thermal expansion amount of each frame roller in the process of rolling the target strip steel is detected to meet a first preset range, determining the target strip steel as the first strip steel of the target roller period; for each frame roller, when the difference between the thermal expansion amount of the frame roller when rolling the upper strip steel and the thermal expansion amount of the frame roller when rolling the lower strip steel meets a second preset range, determining the upper strip steel as the last strip steel of the target roller period; and determining the target roll period based on the first strip steel and the last strip steel.
Specifically, the target strip steel can be any strip steel in the hot continuous rolling process, and the target roll period is any roll period in the N rolling roll periods. When the thermal expansion amount of the target strip steel rolled by the roller meets the first preset range, the target strip steel is used as a new roller period, namely the first strip steel in the target roller period. The first preset range can be set according to actual needs, and in the embodiment of the specification, the first preset range is 0-0.06 mm. It should be noted that, when determining the first strip steel, the first preset range may be satisfied when detecting that the thermal expansion amount of the roll of any stand when rolling the target strip steel, that is, the target strip steel is determined to be the first strip steel, or the first preset range may be satisfied when detecting that all the thermal expansion amounts of the rolls of each stand satisfy, which is not limited herein.
Further, after the first strip steel of the target roll period is determined, the roll thermal expansion amount corresponding to each strip steel is continuously detected block by block, when two adjacent strip steels are detected to be rolled, for example, for an F1 stand, the thermal expansion amount of the roll of the stand when the roll rolls two adjacent strip steels is rolled is respectively determined, the difference value of the thermal expansion amount of the upper strip steel of the two adjacent strip steels minus the thermal expansion amount of the lower strip steel is calculated, and if the difference value meets a second preset range, the upper strip steel is determined as the last strip steel of the target roll period. The second preset range can be set according to actual needs, and in the embodiment of the specification, the second preset range is greater than 0.1mm, that is, the thermal expansion amount of the rolled upper strip steel is greater than that of the rolled lower strip steel and exceeds 0.1 mm. It should be noted that when determining the last strip steel, it may be detected that any rack satisfies the second preset range when rolling two adjacent strip steels, that is, the last strip steel is determined, or when it is detected that each rack satisfies the second preset range when rolling two adjacent strip steels, the last strip steel is determined, which is not limited herein.
Further, by the above method, N roll periods in the hot continuous rolling process are determined, and roll period identification is completed. In the embodiment of the present specification, after N roll periods are determined, each roll period may be numbered.
Next, a roll period diagnosing section is executed, and when the roll period diagnosis is performed, whether the thermal expansion amount of each of the stand rolls determined by the thermal expansion prediction model in each of the N roll periods is reasonable or not is determined one by one. In a specific process, the roll period diagnosis may be realized through step S13, that is: and determining whether the thermal expansion amount of each stand roller converges or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled. In the embodiment of the present specification, determining whether the thermal expansion amount of each stand roller converges may include two steps: firstly, judging whether the thermal expansion amount of each frame roller reaches a stable state, continuously judging whether the thermal expansion amount of each frame roller is reasonable when the thermal expansion amount of each frame roller reaches the stable state, and determining that the thermal expansion amount of each frame roller is converged when the two steps are met.
In a specific implementation process, step S13 may be implemented as follows: determining the difference value of the thermal expansion amount of a target frame roller when the target frame roller rolls two adjacent pieces of strip steel aiming at each roller period; determining whether the target frame roller is in a stable state in the roller period based on the difference value of the thermal expansion amounts when two adjacent pieces of strip steel are rolled; determining a target amount of thermal expansion of the target stand mill roll in the steady state when the target stand mill roll is in the steady state in the roll period, and determining whether the amount of thermal expansion of the target stand mill roll in the roll period converges based on the target amount of thermal expansion.
Specifically, the target stand is any stand in the hot continuous rolling production line, and in the embodiment of the specification, for each stand roll, whether the thermal expansion amount of each stand roll converges in each roll is determined by the thermal expansion amount when the stand roll rolls the strip steel in each roll period.
Taking a stand roller, such as an F1 stand roller as an example, when an F1 stand roller rolls a strip steel in a certain roller period, the thermal expansion amount of the F1 stand roller in rolling each strip steel is predicted through a thermal expansion amount prediction model, the thermal expansion amount difference of two adjacent strip steels is sequentially calculated, and whether the thermal expansion amount of the F1 stand roller is in a stable state in the roller period is determined based on the calculated thermal expansion amount difference.
In the embodiment of the present specification, determining whether the amount of thermal expansion of the stand roll is in a steady state may be determined by: numbering each strip steel in the roll period; when M pieces of strip steel in the roll period of continuous rolling of a target frame roller are detected for the first time, the difference value of the thermal expansion amounts of any two adjacent pieces of strip steel in the M pieces of strip steel meets a third preset range, the target number of the previous piece of strip steel in the M pieces of strip steel is determined, and M is an integer greater than 1; and determining whether the target number meets a fourth preset range, and if the target number does not meet the fourth preset range, determining that the thermal expansion amount of the target frame roller is in a stable state in the roller period.
For each roll stand, a plurality of steel strips need to be rolled, and in the embodiment of the specification, the steel strips in each roll stand can be numbered. In a specific implementation process, in a rolling period, when a difference value of thermal expansion amounts of two adjacent steel strips rolled by a target rack first appears, the difference value meets a third preset range, wherein the third preset range can be set according to needs, and is not limited herein. In this embodiment, the third preset range may be selected to be that the absolute value of the difference between the thermal expansion amounts is less than or equal to 0.0025mm, that is, the absolute value of the difference between the thermal expansion amounts of two adjacent pieces of strip steel when the target frame first appears is less than or equal to 0.0025mm, and when the difference between the thermal expansion amounts of two adjacent pieces of strip steel continuously satisfies that the number of the strip steel in the third preset range is greater than or equal to M, it is determined that the thermal expansion amount of the roll of the target frame is in a stable state in the roll period. Wherein, M may be set according to practical situations, such as M is 6, 7, 8, etc., and is not limited herein.
In the embodiment of the present specification, taking M as 6 as an example, each stand in a multi-stand continuous rolling mill group may be used as a target stand once to detect whether the thermal expansion amount of the roll of each stand is stable. When the absolute value of the difference value of the thermal expansion amounts of two adjacent strip steels is smaller than or equal to 0.0025mm and the absolute value of the difference value of the thermal expansion amounts of any two adjacent strip steels in 6 continuous adjacent strip steels is detected to be smaller than or equal to 0.0025mm, the previous strip steel of the 6 strip steels is taken as the first strip steel with the thermal expansion amount in a stable state, and the target number of the previous strip steel in the roll period is recorded.
Further, whether the target number meets a fourth preset range is determined, and the fourth preset range can be set according to actual needs, in the embodiment of the specification, the fourth preset range is that the number is greater than or equal to 40, and the number is less than or equal to the total rolling block number of the rolling period; alternatively, the fourth preset range is the total number of rolling blocks with the number greater than the roll period. Of course, the fourth preset range may also be set according to actual needs, for example, in general, it is normal that twenty or more rolls (50 to 60 strips rolled in a rolling period) reach a steady state, and for a longer roll period, for example, 100 rolls, it is normal that 30 to 40 rolls reach a steady state, and therefore, for the fourth preset range, a specific range may be selected according to actual conditions, and is not limited herein.
Further, if the target number satisfies the fourth preset range, the thermal expansion amount of the target stand roll is unstable in the roll period, and thus the predicted value of the thermal expansion amount of the target stand roll does not converge. If the target number does not satisfy the fourth preset range, the thermal expansion amount of the target frame roller reaches a stable state in the roller period, and whether the target thermal expansion amount of the target frame roller converges needs to be further judged according to the target thermal expansion amount of the target frame roller in the stable state.
In determining the target thermal expansion amount, an average value of the thermal expansion amounts when the target stand rolls roll each strip steel in the steady state may be set as the target thermal expansion amount. Specifically, in a certain roll period, after it is determined that the first strip having a stable thermal expansion amount is reached in the roll period, all the strips located behind the first strip are the strips in the stable state, for example, 60 strips are rolled in the roll period, when the 21 st strip is rolled, the thermal expansion is determined to be in the stable state according to the third and fourth preset ranges, the 21 st to 60 th strips are the strips rolled in the stable state, the thermal expansion amounts in the 40 th strips are averaged, and the obtained average value is used as the target thermal expansion amount.
Next, whether the target thermal expansion amount meets a fifth preset range is determined, and the fifth preset range can be set according to actual needs, in this embodiment of the present specification, the fifth preset range may be less than or equal to 0.6mm and greater than or equal to 0.08mm, that is, if the target thermal expansion amount meets the fifth preset range, the thermal expansion amount of the target frame roller is converged, that is, the thermal expansion amount obtained through prediction of the target frame roller by the thermal expansion amount model is reasonable. If the target thermal expansion does not meet the fifth preset range, the thermal expansion of the target frame roller does not converge, that is, the thermal expansion obtained by predicting the target frame roller through the thermal expansion model is unreasonable.
In the embodiment of the present specification, whether the thermal expansion amount of each stand roll converges is determined by the above method, and if the thermal expansion amount of each stand roll does not converge, the target parameter of the stand roll whose thermal expansion amount does not converge is adjusted. Specifically, if the thermal expansion amount of a certain stand roll does not converge, for example, if the target thermal expansion amount of a certain stand roll is greater than 0.6mm, it is determined that the thermal expansion amount predicted by the thermal expansion amount prediction model is large when the stand roll rolls the strip steel in the roll period, and in this case, the target parameter of the stand roll may be adjusted, and the target parameter may be a parameter such as a thermal expansion factor or a heat flow coefficient. Meanwhile, the predicted thermal expansion amount of the frame roller is prompted to possibly not accord with the actual thermal expansion amount, and early warning is carried out.
Further, in this embodiment of the present specification, after the determining N rolling periods included in the hot continuous rolling process, the method further includes: determining the type of the rolled steel strip in each roll period; configuring parameters for judging whether the thermal expansion amount of each stand roller is converged in each roller period based on the type of the rolled strip steel in each roller period; the determining, for each of the N rolling mill periods, whether the thermal expansion amount of each stand roll converges based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period includes: and for each roll period, determining whether the thermal expansion amount of each frame roll converges or not based on the thermal expansion amount of each frame roll in the roll period when rolling each strip steel and the parameter used for judging whether the thermal expansion amount of each frame roll converges or not in the roll period.
Specifically, in the embodiment of the present disclosure, after each rolling period is determined, the types of the steel strip rolled in the rolling period are identified, and the types of the steel strip may include SDC03, SDC01, HS1, JD1, SHG2, SPHC, and the like. The types of the rolled band steel may be different in different roll periods, and because the rolled band steel of different types has larger attribute difference, certain flexibility can be provided for judging whether the thermal expansion amount is in a stable state and whether the thermal expansion amount in the stable state is reasonable in the roll period diagnosis process.
In a specific implementation process, the parameters for determining whether the thermal expansion of the rolls of each stand converges may include the number of blocks of the strip steel in a steady state, a fifth preset range that the target thermal expansion satisfies, and the like, and the configuration of the parameters may be corresponding to the corresponding type of the strip steel, such as expert extraction and summarization according to long-term rolling experience and knowledge of the model. For different types of strip steel, different parameters can be configured, for example, when the type of strip steel is type a, the configured parameters are: the number of convergence blocks of the strip steel is 60, and the fifth preset range met by the target thermal expansion amount is 0.08-0.55 mm; when the type of the strip steel is B, the configured parameters are as follows: the number of convergence blocks of the strip steel in the roll period is 40, and the fifth preset range met by the target thermal expansion amount is 0.08-0.6 mm. Of course, other parameters may be configured in addition to the above parameters, and it is not limited herein, and whether the thermal expansion amount of each stand roll converges or not is determined based on the configured parameters.
For better understanding of the method for analyzing thermal expansion of a rolling roller provided in the embodiments of the present disclosure, please refer to fig. 3, which is a flowchart of a method for analyzing thermal expansion of a rolling roller provided in the embodiments of the present disclosure. In fig. 3, the roll thermal expansion analysis method is divided into two parts, roll period identification and roll period diagnosis.
In the roll period identification part, reading the attribute information of each strip steel rolled by each rack; predicting the thermal expansion amount of a roller for rolling each strip steel; judging whether the thermal expansion amount of the rolled strip steel is detected to be between 0 and 0.06mm for the first time; if so, taking the strip steel as the first strip steel in the rolling period; judging whether the difference value of the thermal expansion amount of the rolled upper strip steel minus the thermal expansion amount of the rolled strip steel is larger than 0.1mm or not; if yes, the last strip steel is taken as the last strip steel of the roll period, and the identified roll period number and the number of the rolled strip steel blocks in each roll period are recorded.
In the roll period diagnosing part, diagnosing the thermal expansion amount of each frame roll in roll periods; searching the strip steel block by block, and determining whether the absolute value of the thermal expansion amount when two adjacent strip steels are rolled is less than or equal to 0.0025mm and the accumulated block number is more than 6 blocks for the first time; if yes, recording the number of the first strip steel coil reaching the stable state, the steel type and the sequence number in the roll period; continuously judging whether the number of the first strip steel reaching the stable state is more than or equal to 40 and the number of the first strip steel reaching the stable state is less than or equal to the total number of the strip steel in the rolling period or whether the number of the first strip steel reaching the stable state is more than the total number of the strip steel in the rolling period; if yes, determining a rack with an unconverged thermal expansion value in the roll period, giving an early warning, and diagnosing the unconverged rack number, the corresponding roll period and the time period of the roll period; if not, calculating all the average values of the thermal expansion quantities of the rollers which can reach the stable state; judging whether the average value of the thermal expansion amounts of the rollers after the retrieved stand reaches a stable state in the same roller period is more than 0.6mm and less than 0.08 mm; if so, diagnosing that the predicted value of the thermal expansion amount of the roller of the corresponding frame of the roller period is larger or smaller; comparing the average thermal expansion values of all the racks after the racks reach the stable state, diagnosing the rack number with the maximum/minimum thermal expansion value, and sequencing; summarizing whether the predicted values of the thermal expansion amounts of all the frames in the diagnosed roll period have abnormal problems or not, prompting reasons for the diagnosed abnormal problems and providing a solution; if not, the predicted value of the thermal expansion amount is diagnosed to be normal.
In order to further explain the method for analyzing the thermal expansion of the rolls provided by the application, the method provided by the application is used for analyzing the thermal expansion of the rolled strip steel in one roll period rolled by a seven-stand continuous rolling mill group of a certain hot continuous rolling production line.
The steel types rolled in the roll period are more, mainly comprise SDC03, SDC01, HS1, JD1, SHG2, SPHC and the like, the thickness specification is between 2.3mm and 6mm, the width specification is between 950mm and 1305mm, and the index numbers corresponding to the thickness and width sections are shown in Table 1.
TABLE 1 thickness and Width index numbering
| Thickness index grt | Thickness range mm | Width index wrt | Width range mm |
| 1 | (0,0.8) | 1 | Spare |
| 2 | [0.8,0.9) | 2 | (0,1000) |
| 3 | [0.9,1.0) | 3 | [1000,1100) |
| 4 | [1.0,1.15) | 4 | [1100,1200) |
| 5 | [1.15,1.3) | 5 | [1200,1300) |
| 6 | [1.3,1.5) | 6 | [1300,1400) |
| 7 | [1.5,1.7) | 7 | [1400,1500) |
| 8 | [1.7,1.9) | 8 | [1500,--) |
| 9 | [1.9,2.2) | ||
| 10 | [2.2,2.5) | ||
| 11 | [2.5,2.9) | ||
| 12 | [2.9,3.4) | ||
| 13 | [3.4,4.0) | ||
| 14 | [4.0,5.0) | ||
| 15 | [5.0,6.5) | ||
| 16 | [6.5,8.0) | ||
| 17 | [8.0,9.5) |
To facilitate operation of the roll thermal expansion analysis, fig. 4 is a schematic diagram of a roll thermal expansion analysis interface provided in the embodiments of the present disclosure, through which an analysis diagnosis of roll thermal expansion can be performed. When the thermal expansion analysis interface of the roller is operated, a production line and a production time period are selected through the interface, and the cal is clicked, so that the complete roller period contained in the time period can be accurately identified, the number is marked, and the roller period number is selected, namely the thermal expansion diagnosis condition of the selected roller period occurs. After a certain 'coil number' is selected in the interface, the corresponding steel type name, thickness (GRT), Width (WRT) layer and roll period can be automatically displayed, and the sequencing position, the coil number and the thermal expansion value of the steel type in the roll period can be automatically displayed in a thermal expansion trend graph of the roll period; the 'coil number' can be not selected, and the integral trend diagnosis is carried out on all steel types in the roll period in batches.
As shown in fig. 4, in the roll period diagnosed in this embodiment, 85 pieces of strip steel are rolled together, the number of convergence blocks set in the background configuration file is 60, and the 58 th convergence block is obtained as the diagnosis result, which indicates that the roll period has a low convergence speed and requires adjustment of related parameters. And in each roller period of the converged frame, the value after the thermal expansion is stably converged is continuously diagnosed, the thermal expansion amount of the F2 frame exceeds 0.55mm, according to the expert experience, the value is large, a certain difference possibly exists between the value and the actual thermal expansion amount of the frame, and the diagnosis prompts 'adjustment of a thermal expansion factor or a heat flow coefficient' and further checking is recommended.
In summary, the roller thermal expansion analysis method provided by the embodiment of the present specification can accurately and automatically identify each roller stage in a hot continuous rolling production line, and analyze and diagnose the thermal expansion amount of each rack roller in each roller stage, thereby realizing detection and control of the thermal expansion amount of the roller, and providing a precondition for quality control of subsequent products.
In addition, the method for analyzing the thermal expansion of the roller provided by the embodiment of the specification can greatly reduce the consumption of manpower for data statistics and analysis, timely diagnoses and prewarns the quality problems which are troublesome in production and discovered after analysis by combining with expert experience, provides corresponding optimization strategy suggestions, more accurately realizes the control and treatment of the quality problems, obviously improves the control level of product quality processes, and effectively avoids and controls the generation of similar quality problems. Meanwhile, the domestic steel industry will be supplied for a long time and demand, the requirements of users on product quality are higher and higher, meanwhile, the requirements of individuation and diversification are continuously intensified, the scheme can be realized by carrying out refined diagnosis on similar quality problems according to different product requirements, and the configuration of the provided individualized diagnosis parameters is set by carrying out extraction and summarization according to expert experience so as to realize the customized precise early warning and diagnosis analysis of various products.
In a second aspect, embodiments of the present disclosure provide a roll thermal expansion analysis apparatus for use in a hot continuous rolling production line, as shown in fig. 5, the apparatus includes:
the prediction module 31 is configured to determine the thermal expansion amount of each stand roller when rolling each strip steel based on the attribute information of each stand roller when rolling each strip steel and a preset thermal expansion amount prediction model;
the roll period determining module 32 is configured to determine N rolling roll periods included in the hot continuous rolling process based on the thermal expansion amount of each frame roller when rolling each strip steel, where N is a positive integer;
and a convergence determining module 33, configured to determine, for each roll period of the N rolling roll periods, whether the thermal expansion amount of each stand roll converges based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period.
Optionally, a roll period determination module 32 for:
when the thermal expansion amount of each rack roller in the process of rolling the target strip steel is detected to meet a first preset range, determining the target strip steel as the first strip steel in the target roller period;
for each frame roller, when the difference between the thermal expansion amount of the frame roller when rolling the upper strip steel and the thermal expansion amount of the frame roller when rolling the lower strip steel meets a second preset range, determining the upper strip steel as the last strip steel of the target roller period;
and determining the target roll period based on the first strip steel and the last strip steel.
Optionally, the convergence determining module 33 is configured to:
determining the difference value of the thermal expansion amount of the target frame roller when the target frame roller rolls two adjacent strip steels in each roller period;
determining whether the thermal expansion amount of the target frame roller is in a stable state in the roller period based on the thermal expansion amount difference value when two adjacent pieces of strip steel are rolled;
determining a target amount of thermal expansion of the target stand roll in the steady state when the target amount of thermal expansion of the target stand roll is in the steady state in the roll period, and determining whether the amount of thermal expansion of the target stand roll in the roll period converges based on the target amount of thermal expansion.
Optionally, the convergence determining module 33 is configured to:
numbering each strip steel in the roll period;
when M pieces of strip steel in the roll period of continuous rolling of a target frame roller are detected for the first time, the difference value of the thermal expansion amounts of any two adjacent pieces of strip steel in the M pieces of strip steel meets a third preset range, the target number of the previous piece of strip steel in the M pieces of strip steel is determined, and M is an integer greater than 1;
and determining whether the target number meets a fourth preset range, and if the target number does not meet the fourth preset range, determining that the thermal expansion amount of the target frame roller is in a stable state in the roller period.
Optionally, the convergence determining module 33 is configured to:
taking the average value of the thermal expansion amount of the target frame roller in the stable state when rolling each strip steel as the target thermal expansion amount;
and when the target thermal expansion amount meets a fifth preset range, determining that the thermal expansion amount of the target frame roller is converged.
Optionally, the apparatus further comprises:
and the adjusting module is used for adjusting the target parameters of the stand rollers with unconverged thermal expansion amount if the thermal expansion amount of each stand roller is not converged.
Optionally, the apparatus further comprises:
the strip steel type determining module is used for determining the type of the strip steel rolled in each roll period;
the parameter configuration module is used for configuring parameters used for judging whether the thermal expansion amount of each frame roller is converged in each roller period based on the type of the strip steel rolled in each roller period;
and the convergence determining module is used for determining whether the thermal expansion amount of each frame roller is converged or not according to the thermal expansion amount of each frame roller in the rolling period and the parameter for judging whether the thermal expansion amount of each frame roller is converged or not in the rolling period aiming at each roller period.
With regard to the above-mentioned apparatus, the specific functions of the respective modules have been described in detail in the embodiments of the roll thermal expansion analysis method provided in the embodiments of the present specification, and will not be described in detail here.
In a third aspect, based on the same inventive concept as the method for analyzing thermal expansion of a rolling roll in the previous embodiment, the present specification further provides a device for analyzing thermal expansion of a rolling roll, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to implement the steps of any one of the embodiments of the method for analyzing thermal expansion of a rolling roll.
Where a bus architecture (represented by a bus) is used, the bus may comprise any number of interconnected buses and bridges that link together various circuits including one or more processors, represented by a processor, and memory, represented by a memory. The bus may also link various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the receiver and transmitter. The receiver and transmitter may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus and general processing, while the memory may be used for storing data used by the processor in performing operations.
In a fourth aspect, based on the same inventive concept as the method for analyzing thermal expansion of a rolling roll in the previous embodiments, the present invention further provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any one of the methods for analyzing thermal expansion of a rolling roll as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those 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 such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A roller thermal expansion analysis method is applied to a hot continuous rolling production line and is characterized by comprising the following steps:
determining the thermal expansion amount of each frame roller when rolling each strip steel based on the attribute information of each frame roller when rolling each strip steel and a preset thermal expansion amount prediction model;
determining N rolling periods contained in the hot continuous rolling process based on the thermal expansion amount of each frame roller when rolling each strip steel, wherein N is a positive integer;
and determining whether the thermal expansion amount of each stand roller converges or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled.
2. The method of claim 1, wherein the determining N rolling periods included in the hot continuous rolling process based on the thermal expansion amount of the stand rolls in rolling each strip steel comprises:
when the thermal expansion amount of each rack roller in the process of rolling the target strip steel is detected to meet a first preset range, determining the target strip steel as the first strip steel in the target roller period;
for each frame roller, when the difference between the thermal expansion amount of the frame roller when rolling the upper strip steel and the thermal expansion amount of the frame roller when rolling the lower strip steel meets a second preset range, determining the upper strip steel as the last strip steel of the target roller period;
and determining the target roll period based on the first strip steel and the last strip steel.
3. The method of claim 1, wherein determining whether the thermal expansion of the stand rolls converges based on the thermal expansion of the stand rolls during rolling of each strip in the roll pass for each of the N rolling roll passes comprises:
determining the difference value of the thermal expansion amount of the target frame roller when the target frame roller rolls two adjacent strip steels in each roller period;
determining whether the thermal expansion amount of the target frame roller is in a stable state in the roller period based on the thermal expansion amount difference value of two adjacent rolled strip steels;
determining a target amount of thermal expansion of the target stand roll in the steady state when the target amount of thermal expansion of the target stand roll is in the steady state in the roll period, and determining whether the amount of thermal expansion of the target stand roll in the roll period converges based on the target amount of thermal expansion.
4. The method of claim 3, wherein the determining whether the thermal expansion of the target stand roll is in a stable state during the rolling period based on the thermal expansion difference between the two adjacent rolled steel strips comprises:
numbering each strip steel in the roll period;
when M pieces of strip steel in the roll period of continuous rolling of a target frame roller are detected for the first time, the difference value of the thermal expansion amounts of any two adjacent pieces of strip steel in the M pieces of strip steel meets a third preset range, the target number of the previous piece of strip steel in the M pieces of strip steel is determined, and M is an integer greater than 1;
and determining whether the target number meets a fourth preset range, and if the target number does not meet the fourth preset range, determining that the thermal expansion amount of the target frame roller is in a stable state in the roller period.
5. The method of claim 3, wherein determining the target amount of thermal expansion of the target stand mill roll in the steady state when the target amount of thermal expansion of the target stand mill roll is in the steady state during the roll period, and determining whether the amount of thermal expansion of the target stand mill roll converges during the roll period based on the target amount of thermal expansion comprises:
taking the average value of the thermal expansion amount of the target frame roller in the stable state when rolling each strip steel as the target thermal expansion amount;
and when the target thermal expansion amount meets a fifth preset range, determining that the thermal expansion amount of the target frame roller is converged.
6. The method of claim 1, wherein after determining whether the amount of thermal expansion of each stand roll converges, the method further comprises:
and if the thermal expansion amount of each frame roller is not converged, adjusting the target parameters of the frame rollers with the non-converged thermal expansion amounts.
7. The method of claim 1, wherein after said determining the N rolling periods involved in the hot continuous rolling process, the method further comprises:
determining the type of the rolled steel strip in each roll period;
configuring parameters for judging whether the thermal expansion amount of each stand roller is converged in each roller period based on the type of the rolled strip steel in each roller period;
the determining, for each of the N rolling mill periods, whether the thermal expansion amount of each stand roll converges based on the thermal expansion amount of each stand roll when rolling each strip steel in the roll period includes:
and for each roll period, determining whether the thermal expansion amount of each frame roll converges or not based on the thermal expansion amount of each frame roll in the roll period when rolling each strip steel and the parameter used for judging whether the thermal expansion amount of each frame roll converges or not in the roll period.
8. The utility model provides a roll thermal expansion analytical equipment, is applied to in the hot continuous rolling production line which characterized in that, the device includes:
the prediction module is used for determining the thermal expansion amount of each rack roller when rolling each strip steel based on the attribute information of each rack roller when rolling each strip steel and a preset thermal expansion amount prediction model;
the roll period determining module is used for determining N rolling roll periods contained in the hot continuous rolling process based on the thermal expansion amount of each frame roller when rolling each strip steel, wherein N is a positive integer;
and the convergence determining module is used for determining whether the thermal expansion amount of each stand roller is converged or not according to the thermal expansion amount of each stand roller in each rolling period of the N rolling roller periods when each strip steel in the rolling period is rolled.
9. A roll thermal expansion analysis apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor when executing the program implementing the steps of the method of any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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