WO2022054500A1 - 材料特性値予測システム及び金属板の製造方法 - Google Patents
材料特性値予測システム及び金属板の製造方法 Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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Definitions
- This disclosure relates to a material property value prediction system and a method for manufacturing a metal plate.
- the present disclosure relates to the manufacturing conditions of the process after the process so that the desired material property value can be finally obtained when the parameters related to the production deviate from the set range in the middle of the process of manufacturing the metal plate.
- the present invention relates to a material property value prediction system and a method for manufacturing a metal plate, which enables optimization.
- the molten metal becomes a slab (slab) in the continuous casting process after component adjustment.
- the slab is heated to become a hot-rolled steel sheet in the hot-rolling (hot-rolling) process.
- the hot-rolled steel sheet can become a cold-rolled steel sheet through a cold rolling (cold rolling) step and a continuous annealing step. Further, the hot-rolled steel sheet can become a hot-dip galvanized steel sheet through a cold rolling step and a continuous annealing hot-dip galvanizing step.
- Patent Document 1 constructs a quality prediction model from manufacturing results using a statistical probability model such as a linear regression model, and limits the quality control of steel manufactured by the quality prediction model. Disclose the decision.
- Patent Document 2 discloses a system for predicting a material from manufacturing record data.
- Patent Document 2 is a technique for predicting outliers from a target value and performing material control with high accuracy by using a prior prediction model as learning data (teacher data) and finding a difference from the prediction model derived each time. To propose.
- Patent Document 3 is a quality prediction system based on manufacturing results, and is a system that predicts the quality of a target product from the similarity between the prediction model for learning and the quality prediction model derived from the operating conditions of the actual target product. Disclose. Patent Document 3 discloses a technique for highly predicting the probability of occurrence of defects by applying a machine learning algorithm instead of conventional linear prediction to the construction of a prediction model.
- Patent Documents 1 to 3 consider only directly adjustable manufacturing conditions, and do not consider disturbances such as air temperature and water temperature. However, such disturbances have a great influence on the material property values of the final product.
- the technique of Patent Document 1 uses a statistical probability model to set a highly accurate manufacturing condition target value for the product quality to match the target value before the start of manufacturing, and is a subsequent process during manufacturing. The conditions cannot be changed.
- the techniques of Patent Document 2 and Patent Document 3 do not assume a change in the conditions of a subsequent process during manufacturing. Further, the techniques of Patent Document 2 and Patent Document 3 require a large amount of training data in order to generate a highly accurate prediction model.
- An object of the present disclosure made in view of this point is to provide a material property value prediction system capable of predicting material property values with high accuracy.
- Another object of the present disclosure is a metal capable of improving the yield of a product by appropriately changing the manufacturing conditions of a subsequent process based on the material property values predicted by the material property value prediction system. The purpose is to provide a method for manufacturing a plate.
- the material property value prediction system is An input data including an equipment output factor, a disturbance factor, and a component value of the metal plate being manufactured in a facility for manufacturing a metal plate is acquired, and the input data is input using a prediction model of the metal plate to be manufactured. Equipped with a material property value prediction unit that predicts material property values,
- the prediction model is A machine learning model generated by machine learning that inputs the input data and outputs manufacturing condition factors, A metallurgical model that inputs the manufacturing condition factor and outputs the material property value, including.
- the method for manufacturing a metal plate according to an embodiment of the present disclosure is as follows.
- a method for manufacturing a metal plate including a hot rolling process, a cold rolling process, and an annealing process.
- a step of acquiring the input data in the hot rolling process and predicting the material characteristic value of the metal plate by using the material characteristic value prediction system is provided.
- the manufacturing condition factor is at least one of coarse rolling ratio, finish rolling ratio, rolling inlet side temperature, rolling exit side temperature, rolling pass temperature, cooling start time, cooling temperature, cooling rate, line speed and winding temperature. including.
- a method for manufacturing a metal plate including a hot rolling process, a cold rolling process, and an annealing process.
- a step of acquiring the input data in the cold rolling process and predicting the material characteristic value of the metal plate by using the material characteristic value prediction system is provided.
- the manufacturing condition factor includes at least one of a rolling rate, a cold pressure rate and a friction coefficient.
- a method for manufacturing a metal plate including a hot rolling process, a cold rolling process, and an annealing process.
- a step of acquiring the input data in the annealing step and predicting the material characteristic value of the metal plate is provided.
- the production condition factor includes at least one of line speed, annealing temperature, annealing time, heating rate, cooling temperature, cooling time, cooling rate, reheating temperature, reheating rate and reheating time.
- a method for manufacturing a metal plate including an annealing process, a plating process, and a reheating process.
- the production condition factors include line speed, annealing temperature, annealing time, heating rate, cooling temperature, cooling time, cooling rate, reheating temperature, reheating rate, reheating time, alloying temperature, alloying time and dew point. Includes at least one of them.
- a material property value prediction system capable of predicting material property values with high accuracy.
- a method for manufacturing a metal plate capable of improving the yield of a product by appropriately changing the manufacturing conditions of a subsequent process based on the material property values predicted by the material property value prediction system. Can be provided.
- FIG. 1 is a diagram showing a configuration example of a material property value prediction system.
- FIG. 2 is a diagram for explaining another configuration example of the material property value prediction system.
- FIG. 3 is a block diagram of the information processing device.
- FIG. 4 is a diagram showing a flow of prediction of material property values using a prediction model.
- FIG. 5 is a diagram showing a flow of prediction of the tensile strength of a hot-rolled steel sheet using a prediction model.
- FIG. 6 is a flowchart showing a process related to prediction of material property values executed in the manufacture of a metal plate.
- FIG. 1 shows a configuration example of a material property value prediction system 100 for, for example, steel according to an embodiment of the present disclosure.
- the material characteristic value prediction system 100 includes an information processing device 10 used in the manufacture of a metal plate.
- the information processing device 10 may be a process computer that controls operations.
- the steel strip 9 obtained by winding a steel plate in a coil shape is a product, but the product is not limited to the steel strip 9.
- the product may be a flat plate of metal, which is a steel material. That is, the material property value prediction system 100 can be used in a method for manufacturing a metal plate in a broad sense.
- the steel material may be carbon steel or alloy steel.
- the metal plate is not limited to steel, and for example, an aluminum alloy, copper, titanium, magnesium, or the like may be used as a material.
- the material characteristic value prediction system 100 includes a converter 1, a continuous casting machine 2, a heating furnace 3, a scale breaker 4, a rough rolling mill 5, a finishing rolling mill 6, and a cooling device 7.
- the winding device 8, the steel strip 9, and the information processing device 10 are included.
- the raw material iron ore is first charged into the blast furnace together with limestone and coke, and molten pig iron is produced.
- the components of carbon and the like are adjusted in the converter 1 for the pig iron produced in the blast furnace, and the final components are adjusted by secondary refining.
- refined steel is cast to produce an intermediate material called a slab.
- the slab is heated by the heating step in the heating furnace 3, and the steel strip 9 is manufactured through the hot rolling step by the rough rolling mill 5 and the finishing rolling mill 6, the cooling step by the cooling device 7, and the winding device 8. .
- the manufacturing step may appropriately include a pickling step, a cold rolling step, an annealing step, a skin pass step, an inspection step, and other treatment steps after the cooling step.
- the material characteristic value prediction system 100 may be configured to include a metal plate manufacturing facility different from that shown in FIG. 1. As shown in FIG. 2, for example, the material property value prediction system 100 may be provided with a continuous annealing facility (hereinafter referred to as a hot-dip galvanizing line) for manufacturing a hot-dip galvanized steel sheet. In the hot-dip plating line of FIG. 2, the cold-rolled steel sheet is made into a hot-dip galvanized steel sheet.
- a hot-dip galvanizing line a continuous annealing facility for manufacturing a hot-dip galvanized steel sheet.
- the hot-dip plating line has a heating zone 11, a soaking zone 12, and a cooling zone 13 as annealed portions.
- the annealing step in the hot-dip plating line is a heat treatment step performed in the annealed portion, in which the temperature of the steel sheet is raised from around room temperature, kept at a predetermined temperature, and then the temperature of the steel sheet is suitable for zinc plating. Lower the temperature.
- the hot-dip plating line has a plating portion on the downstream side of the annealed portion.
- the hot-dip plating line has a snout 14, a zinc plating tank 15, and a wiping device 16 as plating portions.
- the plating step in the hot-dip plating line is a step of adhering an appropriate amount of plating to the steel sheet executed in the plating portion.
- the hot-dip plating line has a reheating section on the downstream side of the plating section.
- the hot-dip plating line has an alloying zone 17, a tropical zone 18, and a final cooling zone 19 as reheating portions.
- the reheating step in the hot-dip plating line is a heat treatment step performed in the reheating section.
- the heating zone 11 is a facility for raising the temperature of the steel sheet, and heats the steel sheet to a preset temperature in the range of about 650 to 950 ° C. depending on the steel type.
- the soothing tropics 12 is a facility that keeps a steel plate at a predetermined temperature.
- the cooling zone 13 is a facility for cooling to about 450 ° C. as a temperature suitable for performing zinc plating.
- the snout 14 is supplied with a mixed gas containing hydrogen, nitrogen, and water vapor inside, and adjusts the atmosphere gas until the steel sheet is immersed in the galvanizing tank 15.
- the zinc plating tank 15 has a sink roll inside, and the steel sheet that has passed through the snout 14 is immersed downward, and the steel sheet to which molten zinc is adhered to the surface is pulled up above the plating bath.
- the wiping device 16 blows wiping gas from nozzles arranged on both sides of the steel sheet to scrape off excess molten zinc adhering to the surface of the steel sheet, and adjusts the amount of molten zinc adhering (weight).
- the alloying zone 17 raises the temperature of the steel sheet that has passed through the wiping device 16 to the temperature at which the Zn—Fe alloying reaction proceeds (usually about 500 ° C.).
- the tropical 18 keeps the temperature of the steel sheet in order to secure the time required for the alloying reaction to proceed.
- the final cooling zone 19 finally cools the alloyed steel sheet to near room temperature.
- the material characteristic value prediction system 100 can be configured to include, for example, a metal plate manufacturing facility including a hot rolling process, a cold rolling process, and an annealing process. Further, the material characteristic value prediction system 100 may be configured to include, for example, a metal plate manufacturing facility including an annealing step, a plating step, and a reheating step.
- FIG. 3 shows a block diagram of the information processing apparatus 10.
- the information processing device 10 includes a control unit 110, a storage unit 120, a communication unit 130, an input unit 140, and an output unit 150.
- the information processing apparatus 10 calculates necessary manufacturing conditions based on desired material property values of the product, and sets a manufacturing condition factor for each manufacturing device.
- the material property value is a value indicating physical properties such as strength of the product and resistance to external force. Tensile strength is an example of material property values.
- the manufacturing condition factor is a parameter (manufacturing parameter) that can be adjusted in the process of manufacturing the product. Rolling rate is an example of a manufacturing condition factor.
- the information processing apparatus 10 generates a prediction model 122 including a machine learning model generated by machine learning and a metallurgy model.
- the information processing apparatus 10 functions as a material characteristic value prediction device that predicts material characteristic values using the prediction model 122. Further, the information processing apparatus 10 can modify the manufacturing condition factor in the subsequent process based on the predicted material property value. The details of the prediction model 122 and the flow of prediction of material property values will be described later.
- the control unit 110 includes at least one processor, at least one dedicated circuit, or a combination thereof.
- the processor is a general-purpose processor such as a CPU (central processing unit) or a dedicated processor specialized for a specific process.
- the dedicated circuit is, for example, FPGA (field-programmable gate array) or ASIC (application specific integrated circuit).
- the control unit 110 executes processing related to the operation of the information processing device 10 while controlling each unit of the information processing device 10.
- control unit 110 includes a material characteristic value prediction unit 111.
- the material characteristic value prediction unit 111 acquires input data including equipment output factors, disturbance factors, and component values of the metal plate being manufactured in the equipment for manufacturing the metal plate, and uses the prediction model 122 for inputting the input data. Predict the material property values of the manufactured metal plate.
- the storage unit 120 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or at least two combinations thereof.
- the semiconductor memory is, for example, a RAM (random access memory) or a ROM (read only memory).
- the RAM is, for example, SRAM (static random access memory) or DRAM (dynamic random access memory).
- the ROM is, for example, EEPROM (electrically erasable programmable read only memory).
- the storage unit 120 functions as, for example, a main storage device, an auxiliary storage device, or a cache memory.
- the storage unit 120 stores data used for the operation of the information processing device 10 and data obtained by the operation of the information processing device 10.
- the storage unit 120 stores the actual database 121 and the prediction model 122.
- the performance database 121 stores various measured values and set values related to the manufacturing equipment and the operation using the manufacturing equipment.
- the measured values and set values stored in the actual database 121 include those used as training data for the information processing apparatus 10 to generate the prediction model 122.
- the communication unit 130 includes at least one communication interface.
- the communication interface is, for example, a LAN interface, a WAN interface, an interface compatible with mobile communication standards such as LTE (Long Term Evolution), 4G (4th generation) or 5G (5th generation), or a short-range wireless such as Bluetooth (registered trademark). It is an interface that supports communication.
- the communication unit 130 receives data used for the operation of the information processing device 10. Further, the communication unit 130 transmits data obtained by the operation of the information processing device 10.
- the input unit 140 includes at least one input interface.
- the input interface is, for example, a physical key, a capacitive key, a pointing device, a touch screen or a microphone integrated with a display.
- the input unit 140 accepts an operation for inputting data used for the operation of the information processing apparatus 10.
- the input unit 140 may be connected to the information processing device 10 as an external input device instead of being provided in the information processing device 10.
- any method such as USB (Universal Serial Bus), HDMI (registered trademark) (High-Definition Multimedia Interface) or Bluetooth (registered trademark) can be used.
- the output unit 150 includes at least one output interface.
- the output interface is, for example, a display or a speaker.
- the display is, for example, an LCD (liquid crystal display) or an organic EL (electroluminescence) display.
- the output unit 150 outputs the data obtained by the operation of the information processing apparatus 10.
- the output unit 150 may be connected to the information processing device 10 as an external output device instead of being provided in the information processing device 10.
- any method such as USB, HDMI (registered trademark) or Bluetooth (registered trademark) can be used.
- the function of the information processing apparatus 10 is realized by executing the information processing program performed in the present embodiment by a processor corresponding to the control unit 110. That is, the function of the information processing apparatus 10 is realized by software.
- the program causes the computer to function as the information processing apparatus 10 by causing the computer to execute the operation of the information processing apparatus 10.
- a part or all the functions of the information processing apparatus 10 may be realized by a dedicated circuit corresponding to the control unit 110. That is, some or all the functions of the information processing apparatus 10 may be realized by hardware.
- FIG. 4 is a diagram showing a flow of prediction of material property values using the prediction model 122.
- the prediction accuracy of material property values can be improved by using the hybrid parameters of metallurgy and operation results, which are converted from metallurgy parameters to actual operation parameters. rice field.
- the prediction model 122 used by the information processing apparatus 10 to predict the material property value is configured to include a machine learning model and a metallurgy model.
- the machine learning model inputs input data including equipment output factors, disturbance factors, and component values of the metal plate being manufactured, and outputs manufacturing condition factors.
- the manufacturing condition factor is a parameter that can be adjusted in the process of manufacturing the product.
- the manufacturing condition factor indicates the manufacturing conditions of a part of the metal plate manufacturing process, and the content differs depending on which process is targeted. Specific examples of production condition factors will be described later.
- the machine learning model is generated by machine learning, and can reflect the influence of the disturbance factor on the manufacturing condition factor, for example, by using the learning data including the disturbance factor.
- the machine learning model can accurately show the relationship between the actual operation parameters, the operation performance parameters, and the production condition factors regarding the operation of the manufacturing equipment for manufacturing the metal plate.
- the metallurgical model inputs a manufacturing condition factor and outputs a material property value.
- Material property values include tensile strength, yield strength, elongation, hole expansion rate, bendability, r value, hardness, fatigue characteristics, impact value, delayed fracture value, wear value, chemical conversion treatment, high temperature characteristics, and low temperature toughness. , Corrosion resistance, magnetic properties and surface properties may be included.
- the metallurgical model is a predictive formula based on the physicochemical phenomenon of metals.
- the metallurgical model may be composed of a plurality of models.
- the metallurgical model is a first metallurgical model in which a manufacturing condition factor is input and a metallurgical phenomenon factor is output, and a second metallurgical model in which the metallurgical phenomenon factor is input and a material property value is output.
- Metallurgical phenomenon factors include body integral ratio, surface texture, precipitate size, precipitate density, precipitate shape, precipitate dispersion state, recrystallization rate, phase fraction, crystal grain shape, texture, residual stress, dislocation density. And at least one of the crystal grain sizes may be included. If the metallurgical phenomenon can be actually measured, the measured value of the metallurgical phenomenon factor may be used. Examples of the method for measuring a metallurgical phenomenon include an in-line X-ray measuring instrument, an ultrasonic flaw detector, and a magnetic measuring instrument.
- the metallurgical model shows the metallurgical phenomenon with high accuracy based on the theoretical formula of the physicochemical phenomenon.
- the metallurgical model may further reflect a rule of thumb based on the operational performance of the manufacturing equipment.
- the metallurgical model can accurately show the relationship between metallurgical parameters, manufacturing condition factors and material property values. Further, the metallurgy model is generated without machine learning, and the accuracy does not change depending on the number of training data. Therefore, it is possible to accurately adjust the manufacturing condition factors by performing the inverse analysis using the metallurgical model even when the past manufacturing results are small or absent.
- the input value is randomly given to the prediction model of the material property value by the metallurgical model constructed with the manufacturing condition factor as the input value within the applicable range of the model, the material property value is estimated, and the target material property value is estimated.
- the input value close to is the optimum manufacturing condition factor.
- FIG. 5 is a diagram showing the flow of prediction of the tensile strength of a hot-rolled steel sheet using the prediction model 122.
- the prediction of the tensile strength shown in FIG. 5 is executed in the middle of the process of processing the slab manufactured in the steelmaking process in the hot rolling process, the cold rolling process and the baking process to finally manufacture the steel sheet. Will be done.
- the information processing device 10 determines the component values of the equipment output factor, the disturbance factor, and the hot-rolled steel sheet in the subsequent hot rolling process.
- Equipment output factors include, for example, heating furnace heater output in hot rolling process, heating furnace continuous output time, transfer roll rotation speed, bar heater output value, rolling load, vertical roll rolling load difference, spray pressure between stands, runout table cooling water amount. And at least one of the runout table cooling water pressures.
- the disturbance factor includes, for example, at least one of the cooling water temperature and the air temperature in the hot rolling process.
- the component value is, for example, at least one of C, Si, Mn, P, S, Al, N, O, Ca, Ni, B, Ti, Nb, Mo, Cr, Sn, W and Ta measured for the hot-rolled steel sheet.
- the disturbance factor for example, the cooling water temperature in the hot rolling process, the air temperature, and the expected air temperature when passing through each process may be used.
- the component value the value of the steelmaking process may be used.
- the information processing device 10 inputs input data to the machine learning model to obtain a manufacturing condition factor.
- the machine learning model outputs the manufacturing condition factors that can be set in the hot rolling process.
- the manufacturing condition factor includes, for example, at least one of a rough rolling rate, a finished rolling rate, a rolling inlet temperature, a rolling exit temperature, a cooling start time, a cooling rate, a line rate and a take-up temperature in a hot rolling process.
- the information processing apparatus 10 inputs a manufacturing condition factor into the metallurgical model to obtain the predicted tensile strength of the steel sheet.
- the metallurgy model has a first metallurgy model in which a manufacturing condition factor is input and a metallurgy phenomenon factor is output, and a second metallurgy model in which a metallurgy phenomenon factor is input and a material property value is output.
- the first metallurgical model is, for example, a model based on the Zener-Hollomon law.
- the second metallurgical model is, for example, a model based on the Hall-Petch rule.
- the Zener-Hollomon rule is an empirical rule for estimating the recrystallization of a metal structure when a metal is processed at a high temperature.
- a metallurgical phenomenon factor for example, a crystal grain size, is output by an improved model based on the Zener-Hollomon rule using the actual manufacturing value as an input value.
- the Hall-Petch rule is an empirical rule for estimating the material strength from the crystal grain size of the metal structure.
- the tensile strength is output from the crystal grain size of the metal structure by an improved model based on the Hall-Petch rule using the actual manufacturing value as the input value.
- the prediction model 122 including the machine learning model and the metallurgy model is generated according to the process of the metal plate manufacturing equipment.
- FIG. 5 is an example of the prediction model 122 in the hot rolling process.
- different prediction models 122 are prepared for the cold rolling process and the annealing process.
- the prediction model 122 in the cold rolling process after the hot rolling process is, for example, when the hot rolling process is executed and it is determined that the rolling conditions of the hot-rolled steel sheet are out of the set range, the material characteristic value is Used for prediction.
- the information processing apparatus 10 acquires the input data in the cold rolling process.
- the equipment output factor input to the machine learning model includes, for example, at least one of rolling load, vertical roll rolling load difference, roll diameter, roll rotation speed and lubrication condition in the cold rolling process.
- the manufacturing condition factor output by the machine learning model includes, for example, at least one of a rolling ratio, a cold pressure ratio, and a friction coefficient in a cold rolling process.
- the prediction model 122 in the annealing process after the cold rolling process is a material characteristic value when, for example, the cold rolling process is executed and it is determined that the rolling conditions of the cold-rolled steel sheet are out of the set range. Used for prediction.
- the information processing apparatus 10 acquires the input data in the annealing process.
- the equipment output factor input to the machine learning model includes, for example, at least one of the annealing furnace output value, the cooling gas injection amount, the gas type fraction, and the alloying furnace output value in the annealing step.
- the manufacturing condition factors output by the machine learning model are, for example, the line speed, annealing temperature, annealing time, heating rate, cooling temperature, cooling time, cooling rate, reheating temperature, reheating rate and reheating time in the annealing process. Includes at least one of.
- the tensile strength Prediction can be performed.
- the prediction model 122 is used for predicting the material property value of the plated steel sheet, for example, when it is determined that the slab component is out of the set range.
- the information processing apparatus 10 acquires input data in a process after the steelmaking process, that is, an annealing process, a plating process, and a reheating process.
- the equipment output factor input to the machine learning model includes, for example, at least one of the annealing furnace output value, the cooling gas injection amount, the gas type fraction and the alloying furnace output value.
- the manufacturing condition factors output by the machine learning model are, for example, line speed, annealing temperature, annealing time, temperature rise rate, cooling temperature, cooling time, cooling rate, reheating temperature, reheating rate, reheating time, alloying. Includes at least one of temperature, alloying time and dew point.
- the input data includes the equipment output factor of a plurality of processes after the steelmaking process, that is, the equipment output factor of the annealing process, the equipment output factor of the plating process, and the equipment output factor of the reheating process.
- the output of the machine learning model includes manufacturing condition factors of a plurality of steps after the steelmaking process, that is, manufacturing condition factors of the annealing step, manufacturing condition factors of the plating step, and manufacturing condition factors of the reheating step.
- the machine learning model outputs manufacturing condition factors related to the subsequent process from the input data related to the later process, but the subsequent process may be one process or may be a plurality of processes as in this example.
- the information processing apparatus 10 acquires learning data from the performance database 121 and generates a machine learning model using the learning data.
- the training data is selected according to the process of manufacturing the metal plate in which the machine learning model is used.
- the training data for generating a machine learning model for a hot rolling process can be input as heating furnace heater output, heating furnace continuous output time, transfer roll rotation speed, bar heater output value, rolling load, vertical roll. Includes rolling load difference, spray pressure between stands, runout table cooling water amount and runout table cooling water pressure, and outputs are rough rolling rate, finish rolling rate, rolling inlet side temperature, rolling exit side temperature, rolling pass temperature, cooling start time. , Cooling temperature, cooling rate, line speed and winding temperature may be selected.
- the training data for generating a machine learning model for a cold rolling process includes rolling load, vertical roll rolling load difference, roll diameter, roll rotation speed and lubrication conditions as inputs, and rolling ratio and cold as outputs. Those including the rolling ratio and the coefficient of friction may be selected.
- the training data for generating a machine learning model for the manufacturing process of cold-rolled steel sheets includes the annealing furnace output value and the cooling gas injection amount as inputs, and the line speed, annealing temperature, annealing time, as outputs. Those including a heating rate, a cooling temperature, a cooling time, a cooling rate, a reheating temperature, a reheating rate and a reheating time may be selected.
- the training data for generating a machine learning model for the manufacturing process of a plated steel plate includes the annealing furnace output value, the cooling gas injection amount, the gas type fraction and the alloying furnace output value as the output, as the output.
- all the training data contains at least one disturbance factor as an input. Therefore, the machine learning model takes into account disturbances that affect the material property values of the product. Also, the input of all training data includes at least one component value.
- the method for generating a machine learning model using such learning data may be, for example, a neural network, but is not limited thereto. As another example, a machine learning model may be generated by a method such as a decision tree or a random forest.
- the method for manufacturing a metal plate can be executed by using the above-mentioned material characteristic value prediction system 100, including a step of predicting the material characteristic value of the metal plate.
- FIG. 6 is a flowchart showing a process related to prediction of material property values executed in the manufacture of a metal plate.
- the material property value prediction system 100 waits if the executed metal plate manufacturing process is not the verification target process (No in step S1), and proceeds to the process in step S2 if the execution target process is the verification target process (Yes in step S1). ..
- the verification target process is a part of the process selected from the metal plate manufacturing process, and is a step of executing the determination in step S2.
- the metal plate manufacturing process consists of a steelmaking process, a hot rolling process, a first pickling process, a cold rolling process, an annealing process, a second pickling process, a skin pass process, an inspection process, and a shipping process.
- the verification target process may be a steelmaking process, a hot rolling process, a cold rolling process, and an annealing process.
- the number of processes to be verified may be plurality or one as described above. Further, the process to be verified may be selected on the condition that it has a plurality of production condition factors, that is, the production conditions can be adjusted by a plurality of parameters.
- the material property value prediction system 100 returns to the process of step S1 if the parameter related to the process to be verified does not deviate from the set range (No in step S2), and proceeds to the process of step S3 if the parameter deviates from the set range (No). Yes in step S2).
- the parameters related to the process to be verified are the measured values of the manufactured products or the manufacturing equipment that can predict that the material characteristic values of the final product deviate from the target (desired material characteristic values). It is a measured value.
- the parameter may be a measured value of the C component of the slab. Then, when the measured value of the component C of the slab deviates greatly beyond the range of error from the normal reference value, the material property value prediction system 100 may proceed to the process of step S3.
- the material characteristic value prediction system 100 predicts the material characteristic value using the prediction model 122 (step S3).
- the material property value prediction system 100 predicts the material property value only when it is determined that there is an abnormality in the product being manufactured. In other words, if it is determined that there is no problem with the manufacturing conditions, the prediction calculation of the material property values is not executed, and the manufacturing conditions described later are not modified. Therefore, it is possible to efficiently proceed with the production of the metal plate.
- the material property value prediction system 100 calculates the manufacturing condition factor of the subsequent process using the metallurgical model based on the predicted material property value and the desired material property value (step S4).
- the material property value prediction system 100 performs an inverse analysis using a metallurgical model to calculate, for example, a modified value of a manufacturing condition factor for reducing the difference between the predicted material property value and the desired material property value. ..
- the material property value prediction system 100 uses the prediction model 122 in the hot rolling process, which is a subsequent step, to make a final product. Material property values may be predicted. Then, the material property value prediction system 100 back-analyzes the metallurgical model and calculates the correction value of the manufacturing condition factor in the hot rolling process in order to bring the predicted material property value closer to the target value at the time of manufacturing. good.
- the material characteristic value prediction system 100 modifies the manufacturing conditions in the subsequent process based on the values calculated in step S4 (step S5). After that, the material property value prediction system 100 returns to the process of step S1 and executes the same process in the next verification target process. For example, when the manufacturing conditions of the hot rolling process are modified as described above and the hot rolling process, which is the verification target process, is executed, a series of processes may be executed. If the components of the hot-rolled steel sheet are out of the set range even under the modified manufacturing conditions, the material property value prediction system 100 uses the prediction model 122 in the subsequent cold rolling process to make the final production. The material property value of the object may be predicted.
- the material property value prediction system 100 back-analyzes the metallurgical model and calculates the correction value of the manufacturing condition factor in the cold rolling process in order to bring the predicted material property value closer to the target value at the time of manufacturing. good.
- the material property value prediction system 100 may modify the manufacturing conditions of the cold rolling process based on the modified values.
- the material property value prediction system 100 uses the prediction model 122 that takes into consideration the disturbance that greatly affects the material property value of the final product due to the above configuration, and uses the material property.
- the value can be predicted with high accuracy.
- the yield of a product is improved by appropriately changing the manufacturing conditions of a subsequent process based on the material property values predicted by the material property value prediction system 100. Is possible.
- each means, each step, etc. can be rearranged so as not to be logically inconsistent, and a plurality of means, steps, etc. can be combined or divided into one. ..
- the metal plate manufactured by using the material property value prediction system 100 is not limited to the one used in a specific field. That is, the metal plate manufactured by using the material characteristic value prediction system 100 is widely used for transportation equipment such as automobiles, construction machinery, trains, trains, medical care, food, and home appliances.
- an unexpected change in air temperature and water temperature such as cooling water is exemplified as a disturbance, but the disturbance is not limited to these.
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Abstract
Description
金属板を製造する設備における設備出力因子、外乱因子及び製造中の前記金属板の成分値を含む入力データを取得し、前記入力データを入力する予測モデルを用いて、製造される前記金属板の材料特性値を予測する、材料特性値予測部を備え、
前記予測モデルは、
前記入力データを入力して製造条件因子を出力する、機械学習によって生成された機械学習モデルと、
前記製造条件因子を入力して前記材料特性値を出力する金属学モデルと、
を含む。
熱間圧延工程、冷間圧延工程及び焼鈍工程を含む金属板の製造方法であって、
上記の材料特性値予測システムを用いて、前記熱間圧延工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、粗圧延率、仕上圧延率、圧延入側温度、圧延出側温度、圧延パス間温度、冷却開始時間、冷却温度、冷却速度、ライン速度及び巻取温度のうち少なくとも1つを含む。
熱間圧延工程、冷間圧延工程及び焼鈍工程を含む金属板の製造方法であって、
上記の材料特性値予測システムを用いて、前記冷間圧延工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、圧延率、冷圧率及び摩擦係数のうち少なくとも1つを含む。
熱間圧延工程、冷間圧延工程及び焼鈍工程を含む金属板の製造方法であって、
上記の材料特性値予測システムを用いて、前記焼鈍工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、ライン速度、焼鈍温度、焼鈍時間、昇温速度、冷却温度、冷却時間、冷却速度、再加熱温度、再加熱速度及び再加熱時間のうち少なくとも1つを含む。
焼鈍工程、めっき工程及び再加熱工程を含む金属板の製造方法であって、
上記の材料特性値予測システムを用いて、前記焼鈍工程、前記めっき工程及び前記再加熱工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、ライン速度、焼鈍温度、焼鈍時間、昇温速度、冷却温度、冷却時間、冷却速度、再加熱温度、再加熱速度、再加熱時間、合金化温度、合金化時間及び露点のうち少なくとも1つを含む。
図1は、本開示の一実施形態に係る、例えば鉄鋼における材料特性値予測システム100の構成例を示す。材料特性値予測システム100は、金属板の製造で使用される情報処理装置10を備えて構成される。情報処理装置10は、操業を統括するプロセスコンピュータであってよい。図1の例において、鋼板をコイル状に巻いた鋼帯9が製造物であるが、製造物は鋼帯9に限られない。例えば製造物は鉄鋼材料である金属の平板であってよい。つまり、材料特性値予測システム100は、広義の金属板の製造方法で用いられ得る。また、鉄鋼材料は炭素鋼であってよいし、合金鋼であってよい。また、金属板は鉄鋼に限定されず、例えばアルミ合金、銅、チタン、マグネシウム等を素材としてよい。
図3は情報処理装置10のブロック図を示す。情報処理装置10は、制御部110と、記憶部120と、通信部130と、入力部140と、出力部150とを備える。情報処理装置10は、製造物の所望の材料特性値に基づき必要な製造条件を算出して、各製造装置に対して製造条件因子を設定する。材料特性値は、製造物の強度及び外力等への抵抗性などの物理的特性を示す値である。材料特性値の一例として引張強さが挙げられる。また、製造条件因子は、製造物を製造する工程で調整可能なパラメータ(製造パラメータ)である。製造条件因子の一例として圧延率が挙げられる。
図4は、予測モデル122を用いた材料特性値の予測の流れを示す図である。本開示者が予測モデル122に関して鋭意検討を重ねた結果、金属学パラメータを実操業パラメータへ変換した、金属学と操業実績のハイブリッドパラメータを用いることにより、材料特性値の予測精度を向上できることがわかった。
情報処理装置10は、上記の予測を実行する前に、実績データベース121から学習データを取得し、学習データを用いて機械学習モデルを生成する。学習データは、機械学習モデルが用いられる金属板の製造方法の工程に応じて選択される。例えば熱間圧延工程を対象とする機械学習モデルを生成するための学習データは、入力として、加熱炉ヒーター出力、加熱炉連続出力時間、搬送ロール回転数、バーヒーター出力値、圧延荷重、上下ロール圧延荷重差、スタンド間スプレー圧力、ランナウトテーブル冷却水量及びランナウトテーブル冷却水圧を含み、出力として、粗圧延率、仕上圧延率、圧延入側温度、圧延出側温度、圧延パス間温度、冷却開始時間、冷却温度、冷却速度、ライン速度及び巻取温度を含むものが選択されてよい。例えば冷間圧延工程を対象とする機械学習モデルを生成するための学習データは、入力として圧延荷重、上下ロール圧延荷重差、ロール径、ロール回転数及び潤滑条件を含み、出力として圧延率、冷圧率及び摩擦係数を含むものが選択されてよい。例えば冷延鋼板の製造工程を対象とする機械学習モデルを生成するための学習データは、入力として、焼鈍炉出力値及び冷却ガス噴射量を含み、出力として、ライン速度、焼鈍温度、焼鈍時間、昇温速度、冷却温度、冷却時間、冷却速度、再加熱温度、再加熱速度及び再加熱時間を含むものが選択されてよい。例えばめっき鋼板の製造工程を対象とする機械学習モデルを生成するための学習データは、入力として焼鈍炉出力値、冷却ガス噴射量、ガス種の分率及び合金化炉出力値を含み、出力としてライン速度、焼鈍温度、焼鈍時間、昇温速度、冷却温度、冷却時間、冷却速度、再加熱温度、再加熱速度、再加熱時間、合金化温度、合金化時間及び露点を含むものが選択されてよい。
金属板の製造方法は、上記の材料特性値予測システム100を用いて、金属板の材料特性値を予測する工程を含んで実行され得る。図6は、金属板の製造において実行される材料特性値の予測に関する処理を示すフローチャートである。
2 連続鋳造機
3 加熱炉
4 スケールブレーカー
5 粗圧延機
6 仕上圧延機
7 冷却装置
8 巻取装置
9 鋼帯
10 情報処理装置
11 加熱帯
12 均熱帯
13 冷却帯
14 スナウト
15 亜鉛めっき槽
16 ワイピング装置
17 合金化帯
18 保熱帯
19 最終冷却帯
100 材料特性値予測システム
110 制御部
111 材料特性値予測部
120 記憶部
121 実績データベース
122 予測モデル
130 通信部
140 入力部
150 出力部
Claims (14)
- 金属板を製造する設備における設備出力因子、外乱因子及び製造中の前記金属板の成分値を含む入力データを取得し、前記入力データを入力する予測モデルを用いて、製造される前記金属板の材料特性値を予測する、材料特性値予測部を備え、
前記予測モデルは、
前記入力データを入力して製造条件因子を出力する、機械学習によって生成された機械学習モデルと、
前記製造条件因子を入力して前記材料特性値を出力する金属学モデルと、
を含む、材料特性値予測システム。 - 前記金属学モデルは金属の物理化学現象に基づく予測式である、請求項1に記載の材料特性値予測システム。
- 前記金属学モデルは、前記製造条件因子を入力して金属学現象因子を出力する第1の金属学モデルと、前記金属学現象因子を入力して前記材料特性値を出力する第2の金属学モデルと、を含み、
前記金属学現象因子は、体積分率、表面性状、析出物寸法、析出物密度、析出物形状、析出物分散状態、再結晶率、相分率、結晶粒形状、集合組織、残留応力、転位密度及び結晶粒径のうち少なくとも1つを含む、請求項1又は2に記載の材料特性値予測システム。 - 前記材料特性値は、引張強さ、降伏強さ、伸び、穴広げ率、曲げ性、r値、硬さ、疲労特性、衝撃値、遅れ破壊値、摩耗値、化成処理性、高温特性、低温靭性、耐食性、磁気特性及び表面性状のうち少なくとも1つを含む、請求項1から3のいずれか一項に記載の材料特性値予測システム。
- 前記金属板は鉄鋼である、請求項1から4のいずれか一項に記載の材料特性値予測システム。
- 熱間圧延工程、冷間圧延工程及び焼鈍工程を含む金属板の製造方法であって、
請求項1から5のいずれか一項に記載の材料特性値予測システムを用いて、前記熱間圧延工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、粗圧延率、仕上圧延率、圧延入側温度、圧延出側温度、圧延パス間温度、冷却開始時間、冷却温度、冷却速度、ライン速度及び巻取温度のうち少なくとも1つを含む、金属板の製造方法。 - 前記設備出力因子は、加熱炉ヒーター出力、加熱炉連続出力時間、搬送ロール回転数、バーヒーター出力値、圧延荷重、上下ロール圧延荷重差、スタンド間スプレー圧力、ランナウトテーブル冷却水量及びランナウトテーブル冷却水圧のうち少なくとも1つを含む、請求項6に記載の金属板の製造方法。
- 熱間圧延工程、冷間圧延工程及び焼鈍工程を含む金属板の製造方法であって、
請求項1から5のいずれか一項に記載の材料特性値予測システムを用いて、前記冷間圧延工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、圧延率、冷圧率及び摩擦係数のうち少なくとも1つを含む、金属板の製造方法。 - 前記設備出力因子は、圧延荷重、上下ロール圧延荷重差、ロール径、ロール回転数及び潤滑条件のうち少なくとも1つを含む、請求項8に記載の金属板の製造方法。
- 熱間圧延工程、冷間圧延工程及び焼鈍工程を含む金属板の製造方法であって、
請求項1から5のいずれか一項に記載の材料特性値予測システムを用いて、前記焼鈍工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、ライン速度、焼鈍温度、焼鈍時間、昇温速度、冷却温度、冷却時間、冷却速度、再加熱温度、再加熱速度及び再加熱時間のうち少なくとも1つを含む、金属板の製造方法。 - 前記設備出力因子は、焼鈍炉出力値、冷却ガス噴射量、ガス種の分率及び合金化炉出力値のうち少なくとも1つを含む、請求項10に記載の金属板の製造方法。
- 焼鈍工程、めっき工程及び再加熱工程を含む金属板の製造方法であって、
請求項1から5のいずれか一項に記載の材料特性値予測システムを用いて、前記焼鈍工程、前記めっき工程及び前記再加熱工程における前記入力データを取得し、前記金属板の材料特性値を予測する工程を備え、
前記製造条件因子は、ライン速度、焼鈍温度、焼鈍時間、昇温速度、冷却温度、冷却時間、冷却速度、再加熱温度、再加熱速度、再加熱時間、合金化温度、合金化時間及び露点のうち少なくとも1つを含む、金属板の製造方法。 - 前記設備出力因子は、焼鈍炉出力値、冷却ガス噴射量、ガス種の分率及び合金化炉出力値のうち少なくとも1つを含む、請求項12に記載の金属板の製造方法。
- 予測された前記金属板の材料特性値と所望の材料特性値とに基づき、製造条件を修正する工程を含む、請求項6から13のいずれか一項に記載の金属板の製造方法。
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