JP7020379B2 - Material control support device for metal materials - Google Patents

Description

The present invention relates to a material control support device for metallic materials.

In metal materials such as steel materials, materials such as mechanical properties (strength, formability, toughness, etc.) and electromagnetic properties (magnetic permeability, etc.) vary depending on the alloy composition, heating conditions, processing conditions, and cooling conditions. ..

The alloy composition can be adjusted by controlling the amount of the constituent elements added. However, when adjusting the composition, one lot unit is large, for example, using a composition adjusting furnace capable of holding about 100 tons of molten steel. Therefore, it is impossible to change the addition amount for each individual product of about 15 tons.

Therefore, in order to manufacture a product of a desired material, it is necessary to optimize the heating conditions, processing conditions, and cooling conditions to manufacture the material. Furthermore, these manufacturing conditions are important not only for the material but also for product quality such as product dimensions and shape, and for realizing stable operation.

In hot rolling, high-temperature steel plate slabs heated to a required temperature in a slab heating furnace are sequentially rolled, cooled, and finally wound up by a coiler while being conveyed on a line. In the hot rolling process, products are made separately by changing various process parameters.

Process parameters include, for example, the target temperature at each point on the rolling line represented by the finishing inlet side temperature, finishing side temperature, winding temperature, etc., the plate thickness schedule of each pass, and the rolling mill. There are the necessity of using the desker, the necessity and flow rate of the interstand cooling arranged between the stands of the continuous rolling mill, the amount of lubricating oil used in the finish rolling mill, the cooling pattern used in the runout table, and the like.

On the other hand, due to the sophistication and diversification of demands on product specifications in recent years, the guarantee range of these target values has become even stricter than before, and it is necessary to manage mechanical properties. For this reason, attempts have been made to input process parameters related to heating, processing, and cooling in the rolling process, a material prediction model for predicting metallographic structure and mechanical properties, and material control using this online. For example, Patent Document 1 proposes a method for predicting and controlling the material of a steel sheet.

This is a content that predicts the material for each process of heating, rough rolling, finish rolling, and cooling, and controls process parameters in order to obtain the target mechanical properties. In order to improve the accuracy, the planned process parameters are first determined from the alloy composition and required mechanical properties. Next, after heating, the actual data such as the actual heating time is taken in and recalculated, and the subsequent processes are reviewed. Further, when the rough rolling is completed, the actual data in the rough rolling is taken in and recalculated, and the subsequent steps are similarly reviewed. Similarly, at the end of finish rolling, the actual data in finish rolling is taken in and recalculated, and the subsequent processes are similarly reviewed.

Further, Patent Document 2 discloses a method of obtaining manufacturing conditions satisfying the required specifications based on a database storing a range of process parameter setting values and actual data of mechanical properties at that time.

Further, Patent Document 3 discloses that when there is no record of satisfying the required specifications, the material is predicted by using the material prediction model, and the manufacturing conditions satisfying the required specifications are obtained.

By such an attempt, it is possible to perform material prediction control with a certain degree of prediction accuracy. However, there is a limit to the prediction accuracy of the material, and it is not always possible to obtain highly accurate prediction results regardless of the steel type and rolling conditions. Therefore, the current situation is that process parameter setting values are determined for each product based on many years of experience to satisfy desired mechanical properties.

By the way, the mechanical properties are strongly related to the temperature of the steel sheet. Therefore, a method of controlling the mechanical properties may be adopted by controlling the temperature of the entire steel sheet by using the measured value of the thermometer arranged in the main part of the hot rolling line. Specifically, the temperature of the steel sheet is measured by thermometers located on the exit side of the heating furnace, the entry / exit side of the rough rolling mill, the entry / exit side of the finish rolling mill, the inlet side of the coiler, etc., and these are measured for many years. It is controlled to achieve the heating temperature target value, the dimensional target value after processing, the cooling rate target value, etc., which have been determined based on experience.

Experienced operators can meet the demands of sophisticated and diversified product specifications with appropriate intervention backed by years of experience in determining process parameter settings. be. However, it is difficult for relatively inexperienced operators to achieve product specifications with appropriate intervention. Therefore, as a method for supporting the determination of the process parameter setting value, for example, as in Patent Document 4, there is a support system for graphing and displaying the process parameter setting value and its upper and lower limit values.

Japanese Patent No. 2509481 Japanese Patent No. 3053251 Japanese Patent No. 3053252 Japanese Patent No. 6109035

However, there is nothing that supports the determination of process parameter settings to satisfy the product specifications regarding dimensions and shapes and the product specifications regarding mechanical properties.

In addition, as described above, due to the sophistication and diversification of product specifications, it is also necessary to satisfy product specifications that have never been rolled. Even in this case, an experienced operator can make a determination by analogy with the process parameter setting values in similar product specifications, and appropriate intervention is possible even during rolling. However, it is difficult for inexperienced operators to properly intervene in process parameter settings as well as index similar product specifications.

The present invention has been made to solve the above-mentioned problems, and is a metal for assisting in determining process parameter setting values that can satisfy desired mechanical properties without being influenced by the degree of experience of the operator. It is an object of the present invention to provide a material control support device for materials.

In order to achieve the above object, the material control support device for a metallic material according to the present invention is configured as follows. The material control support device according to the present invention includes at least a setting calculation unit and a display unit.

The setting calculation unit has each physical model formula representing a process model, a transfer model, a temperature model, and a material model in a hot rolling line for processing a metal material. The setting calculation unit calculates the process parameter settings for controlling the hot rolling line by performing the coupled calculation of each physical model formula based on the hot rolling instruction information, and the temperature of the metal material at each place or time. Predict and calculate the microstructure and the final product material.

As used herein, "process parameter" means all parameters relating to the hot rolling process in a broad sense. Therefore, "process parameters" include hot extension instruction information, process parameter settings, temperature of metallic material at each location or time, microstructure and final product material. Further, the "process parameter set value" is a set value used for controlling the actuator among various process parameters in the hot rolling process. For example, process parameter settings include rolling path schedules, roll gaps, ON / OFF and flow rate settings for various sprays, metal material transfer speeds, valve opening / closing patterns in runout tables, and the like. Also, "mechanical properties" include microstructure and final product materials.

The display unit displays the hot extension command information, the process parameter setting value calculated by the setting calculation unit, the temperature of the metal material at each place or time, the microstructure, and the final product material on the same screen.

In one preferred embodiment, the hot rolling line comprises a finish rolling machine that rolls the metal material in order from the upstream and a coiler that winds the metal material. The hot rolling instruction information includes a cooling pattern from the exit side of the finishing rolling mill to the entry side of the coiler. The temperature of the metallic material at each location or time includes the predicted temperature history from the exit side of the finish rolling mill to the entry side of the coiler. The microstructure includes the particle size of the metal material, the dislocation density, and the fraction of each metal structure such as austenite, ferrite, and pearlite in its cooling pattern or temperature history. The final product material includes numerical values related to the mechanical properties of the final product such as yield stress and tensile strength.

In another preferred embodiment, the hot rolling line comprises a run-out table between the finish rolling mill and the coiler that allows water to be injected into the metal material. The process parameter settings include the valve opening / closing pattern of the water injection valve of the runout table to achieve the cooling pattern or temperature history.

In another preferred embodiment, the display superimposes a continuous cooling transformation diagram showing the beginning and end of the phase transformation of the metal structure on the cooling pattern or temperature history.

In another preferred embodiment, the material control support device for the metallic material further comprises an editorial unit capable of changing the cooling pattern or temperature history displayed by the display unit. The setting calculation unit recalculates each physical model formula with the constraint that the changed cooling pattern or temperature history is satisfied. The display unit updates the screen based on the result of the coupled calculation again by the setting computer.

In another preferred embodiment, the material control support device for metallic materials further comprises a rolling performance database for accumulating performance data for hot rolling lines. The hot rolling instruction information can be manually edited based on the actual data accumulated in the rolling actual database.

According to the material control support device for metal materials according to the present invention, it is represented by process parameter set values, mechanical properties (microstructure, final product material), and cooling patterns and temperature histories that are strongly related to mechanical properties. The temperature parameters of the metal material can be displayed on the same screen. Therefore, it is possible to support the determination of the process parameter setting value that can satisfy the desired mechanical properties without being influenced by the degree of experience of the operator.

It is a figure which shows the hot rolling line which concerns on Embodiment 1 of this invention. It is a figure which shows the equipment structure example of the run-out table which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the structure of the material control support device which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the cooling pattern in the run-out table of Embodiment 1 of this invention. It is a figure which shows an example of the cooling pattern setting in the runout table of Embodiment 1 of this invention. It is a figure which shows an example of the screen composition in the material control support apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the input operation on the configuration screen of the material control support apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the structure of the material control support device which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the screen composition in the material control support apparatus which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, when the number, quantity, quantity, range, etc. of each element is referred to in the embodiment shown below, the reference is made unless it is explicitly stated or when the number is clearly specified in principle. The invention is not limited to the number of cases. In addition, the structures and the like described in the embodiments shown below are not necessarily essential to the present invention, except when explicitly stated or clearly specified in principle. The elements common to each figure are designated by the same reference numerals, and duplicate description will be omitted.

Embodiment 1.
<Hot rolling line>
FIG. 1 is a diagram for explaining an outline of a hot rolling line.

The steel plate 2 heated in the slab heating furnace 1 is extracted into the rolling line 3. The steel plate 2 which is a metal material is thinly rolled to a desired thickness by a rough rolling mill 4 and a finishing rolling mill 5 in a rolling line 3, and at the same time, is processed into a desired width. The rough rolling mill 4 and the finishing rolling mill 5 include a means for measuring the number of revolutions of the rolling mill to measure the transport speed of the steel sheet 2, a means for measuring the rolling load required for rolling the steel plate 2, and rolling. A means for adjusting the roll gap (gap) used in the above is provided.

The rough rolling mill 4 is often composed of 1 to 3 units, and performs multiple-pass rolling in the forward direction (upstream to downstream) and the reverse direction (downstream to upstream) of the rolling direction in which the steel sheet 2 advances. The rough rolling mill 4 may be provided with a device called an edger 6 for adjusting the width of the steel plate 2 and a roughing side thermometer 7 for measuring the temperature of the steel plate. Further, a crop shear that cuts off the tail end of the steel plate 2, a scale breaker that removes the oxide film formed on the surface of the steel plate 2 with high-pressure water, an edge heater that heats the end in the width direction, a bar heater that heats the entire width direction, and the like. In addition, the finish-in side thermometer 9 may be installed between the rough rolling mill 4 and the finish rolling mill 5.

The finish rolling mill 5 is composed of a plurality of rolling stands of 6 to 7, and rolls the steel plate 2 in one direction from upstream to downstream, and determines the final quality regarding dimensions such as the plate thickness and the plate width of the steel plate. After the finish rolling, a means for measuring the plate thickness and the plate width of the steel plate is provided. The temperature of the steel sheet after finish rolling is measured by the finish side thermometer 10.

The temperature of the steel sheet is taken away by the upper and lower rolls when rolled by the rough rolling mill 4 or the finishing rolling mill 5, or is exhausted by the cooling water directly injected onto the steel plate 2. The temperature of the runout table 11 is lowered by injecting water into the steel plate 2. The temperature history when the steel plate 2 passes through the run-out table 11 is determined by the speed (conveyance speed) of the steel plate 2 when passing through the run-out table 11 and the method of discharging the cooling water used in the run-out table 11. The temperature of the steel plate 2 cooled by the run-out table 11 is measured by the coiler inlet-side thermometer 12. The steel plate 2 that has passed through the runout table 11 is coiled by the coiler 13.

<Equipment configuration of run-out table>
The run-out table 11 described above cools the steel plate 2 by a group of water cooling devices called cooling banks installed in a plurality of units. FIG. 2 is a diagram showing an example of equipment configuration of the runout table 11. One cooling bank has about 4 to 8 headers, and a plurality of nozzles are lined up in the direction perpendicular to the rolling direction. A water injection valve is attached to one of the headers. In some cases, multiple headers are controlled by a single water injection valve. In FIG. 2, four cooling banks 20a to 20d, four headers 21a to 21d, a plurality of nozzles 22, and four water injection valves 23a to 23d are drawn.

The flow rate of cooling water is adjusted by opening and closing the water injection valve. A water storage tank (not shown) is installed at a high place at the base of the pipe connected to the water injection valve. Generally, the altitude difference between the water storage tank and the header determines the force of the water flow that collides with the surface of the steel plate. In addition, a water injection valve that can continuously adjust the flow rate may be installed, or a cooling device that uses high-pressure water ejection may be used instead of the collision with the steel plate surface due to the free fall of water as described above. ..

<Material control support device>
FIG. 3 is a schematic view showing the configuration of the material control support device 30 according to the present invention. The material control support device 30 includes a rolling setting computer 14 (setting calculation unit) and an HMI (Human Machine Interface) 16.

<< Rolling setting computer >>
The rolling setting computer 14 receives the hot rolling instruction information 15 from the host computer, performs necessary setting calculations so that a product having a predetermined product size and temperature can be manufactured, and determines a process parameter setting value. The hot rolling instruction information 15 includes the alloy composition and dimensions of the steel plate 2, the target plate thickness, the target plate width, the slab temperature rise pattern in the heating furnace, the heating furnace exit side temperature, the finish exit side target temperature, and the finish input side target temperature. , The cooling pattern from the outlet side of the finish rolling mill 5 to the inlet side of the coiler 13, the winding target temperature, and the like are included. Setting calculation refers to numerical calculation by modeling the theoretically calculable part of the rolling mill setting specifications. In the setting calculation, the calculation of the process parameter setting value and the calculation of the state prediction value of the steel plate 2 in each process of hot rolling are repeated.

The process parameter setting values include rolling path schedule, roll gap, ON / OFF setting and flow rate setting of various sprays, transfer speed of steel plate 2, valve opening / closing pattern of cooling bank of runout table 11. The predicted state value of the steel plate 2 includes the temperature of the steel plate 2 at each place or time, the mechanical properties of the steel plate 2 (microstructure and final product material), and the like.

In the above example, the hot rolling instruction information 15 received from the host computer includes the target values of various process parameters related to the product specifications, but the table (process parameter table 17) is indexed in the database belonging to the rolling setting computer 14. , Various target values may be determined by using the alloy composition of the steel plate 2 and the target dimensions as keys. The process parameter table 17 stores target values of various process parameters corresponding to the alloy composition and target dimensions of the steel sheet 2 and model parameters used for a physical model described later. In the example of FIG. 3, the process parameter table 17 is provided inside the rolling setting computer 14, but may be externally provided to transmit and receive information by connecting to the rolling setting computer 14 via a network.

Further, as a method of setting the cooling pattern on the runout table 11, for example, as shown in FIG. 4, the pre-stage cooling in which the cooling bank on the upstream side is preferentially used and the post-stage cooling in which the cooling bank on the downstream side is preferentially used are used. Select one of the three patterns of cooling and slow cooling using all cooling banks, and set the target values as the cooling rate of the zone where the cooling bank is opened for water cooling and cooling, and the time when the cooling bank is closed for air cooling. There is a way to set it. Further, a pattern of water cooling on the upstream side and the downstream side of the runout table 11 and air cooling in the middle flow is selected. For example, as shown in FIG. 5, the water cooling rate on the upstream side, the air cooling time, and the runout table 11 are selected. There is also a method of setting the temperature at the midpoint of the above as the target value.

Returning to FIG. 3, the explanation will be continued. The physical model used for the setting calculation in the rolling setting computer 14 includes a process model, a transfer model, a temperature model, and a material model. Each model for calculating a physical quantity is represented by an input variable and a function having a model parameter group (machine constant, adjustment term, learning term) stored in the process parameter table 17 as an input. The input variable is a value related to the model output, such as hot rolling instruction information 15 and model output of another model. The mechanical constant is a value representing the mechanical characteristics of the actuator, and is updated as needed because it changes due to maintenance and adjustment of equipment and aging. The adjustment term and the learning term are terms for improving the prediction accuracy of the model formula.

The rolling setting calculator 14 represents a process model, a transfer model, a temperature model, and a material model in a hot rolling line for processing a metal material based on the hot rolling instruction information 15 and the model parameters stored in the process parameter table 17. By coupled calculation of each physical model formula, the process parameter setting value for controlling the hot rolling line, the temperature of the metal material at each place or time, the microstructure, and the final product material are predicted and calculated. ..

The process model calculates the set values of each rolling process such as the slab heating furnace 1, the rough rolling mill 4, the finish rolling mill 5, and the runout table 11. The transport model calculates the position of the steel plate 2 for each time. The temperature model calculates the temperature of the steel plate 2 at each position or time of the steel plate 2. The material model predicts the metallographic structure and material of the steel sheet 2 at each position or time of the steel sheet 2 based on the alloy composition, processing history, and temperature history.

Each model will be described in more detail.

The process model follows the target value given in the hot rolling instruction information 15 using the position of the steel plate 2 at each time given by the transport model and the temperature information of the steel plate 2 at each place or time given by the temperature model. The set temperature pattern of the slab heating furnace 1, the rolling pass schedule (including the plate thickness schedule of each pass of the rough rolling mill 4 and the plate thickness schedule of each stand of the finishing rolling mill 5), the roll gap, every moment. The processing history, dimensions and shape, transfer speed, ON / OFF setting and flow rate setting of various sprays, cooling pattern or temperature history of the steel plate 2 of the above are calculated.

The transport model calculates the position of the steel plate 2 at each time from the distance between each process and the path schedule given by the process model. Further, the transfer speed for following each target temperature is calculated from the information such as the temperature history of the steel plate 2 given by the temperature model.

The temperature model is based on the dimensional information of the steel sheet in each process, information on machine terms, hot rolling instruction information 15, and information such as the path schedule, roll gap, and transfer speed given in each model, and the steel sheet 2 at each location or time. Calculate the temperature of. The temperature of the steel plate 2 at each location or time includes the predicted temperature history from the exit side of the finish rolling mill 5 to the entry side of the coiler 13.

The material model is based on information such as the machining history of the steel sheet 2 given by the process model and the temperature history given by the temperature model, and the metal structure of the steel sheet 2 during the rolling process and after winding, for example, the cooling pattern or temperature history described above. The particle size, dislocation density, and fraction of each metal structure such as austenite, ferrite, and pearlite are calculated. In addition, the material model calculates numerical values related to the mechanical properties of the final product, such as yield stress and tensile strength, based on the calculation results of the metallographic structure.

Various metal structure prediction models have been proposed that formulate the metallurgical phenomenon. It is widely known that it consists of a group of mathematical formulas expressing static recovery, static recrystallization, dynamic recovery, dynamic recrystallization, grain growth, etc., and is a plastic working technology series, 7-plate rolling (Corona Publishing Co., Ltd.), p. 198. -An example is published on page 229. It is also widely known that materials represented by mechanical properties such as yield stress and tensile strength can be predicted from metallographic information and alloy composition. An example is the one published on page 125 of "Structural Change and Material Forecast" (published by The Iron and Steel Institute of Japan). In addition, calculations related to the material model for calculating numerical values related to the mechanical properties of the final product such as particle size, dislocation density, fraction of each metal structure such as austenite, ferrite, and pearlite, and yield stress and tensile strength. Does not necessarily have to go through the above-mentioned calculation process, and for example, the above-mentioned methods such as Patent Document 1, Patent Document 2, and Patent Document 3 may be adopted.

In the hot rolling line described above, the actual data (temperature measured at each place, plate thickness, transfer speed, each cooling bank in the runout table) regarding the steel plate rolled using the process parameter setting value determined by the rolling setting calculator 14 (Opening and closing of the water injection valve, etc.) is sent to the rolling setting calculator 14 and stored in the rolling record database 18. The setting calculation is performed again based on the actual data accumulated in the rolling actual database 18, and the process parameters may be redetermined. The actual data is also used to learn the error in the physical model used for the setting calculation (learning term). In the example of FIG. 3, the rolling record database 18 is provided inside the rolling setting computer 14, but may be externally provided to transmit and receive information by connecting to the rolling setting computer 14 via a network.

The process parameters thus determined are used for rolling control in the hot rolling line and at the same time transmitted to a plurality of HMI 16s installed in the pulpit.

<< HMI >>
The HMI 16 includes a display unit 31, an editing unit 32, a monitor 33, and an input interface 34. The input interface 34 is an operation end of a keyboard, a mouse, a touch panel, and the like.

The display unit 31 contains the process data received from the rolling setting computer 14, the hot rolling instruction information 15, the process parameter setting value, the temperature of the steel sheet 2 at each place or time, the microstructure, the final product material, and the like. Is displayed on the same screen. The operator grasps the hot rolling instruction information 15 regarding the steel plate 2 to be rolled at that time and the rolling situation at that time from a plurality of HMI 16s installed in the palpit or a visual check of the hot rolling line.

The material control support device 30 according to the present invention displays, for example, a screen as shown in FIG. 6 on the monitor 33 of the HMI 16.

In the upper area 61 of the monitor 33, hot rolling instruction information such as the steel type of the steel plate 2, target dimensions such as the target plate thickness and the target plate width, the target temperature on the finishing side, the target winding temperature, the target tensile strength, and the target yield stress The information (process parameters) contained in is displayed.

In the center left area 62 of the monitor 33, a cooling pattern or a temperature history from the exit side of the finishing rolling mill 5 to the entry side of the coiler 13 is displayed. In the displayed cooling pattern or temperature history, information such as a finish-side target temperature, a take-up target temperature, and a cooling rate may be numerically displayed. In addition, a continuous cooling transformation diagram showing the beginning and end of the phase transformation of each metal structure such as austenite, ferrite, and pearlite of the steel sheet in the cooling pattern or temperature history is also displayed superimposed.

In the center right area 63 of the monitor 33, the cooling pattern of the steel sheet 2 or the particle size in the temperature history, the dislocation density, the fraction of each metal structure such as austenite, ferrite, and pearlite, and the mechanical such as yield stress and tensile strength. Numerical values related to the property are shown.

The cooling pattern or temperature history, continuous cooling transformation diagram, fraction of each metal structure, and numerical values related to mechanical properties, which are shown or numerically displayed in the center left area 62 and the center right area 63, are calculated by setting the steel sheet. It is calculated.

In the lower area 64 of the monitor 33, the cooling bank and the water injection valve in the runout table 11 are shown, and the valve opening / closing pattern of the water injection valve set by the setting calculation is displayed.

The information displayed on the monitor 33 as described above does not necessarily have to be displayed at the above-mentioned position, and may be displayed somewhere on the screen.

According to the HMI 16 that displays the screen configured in this way, the operator can use the information of the target value included in the heat spreading command information 15 of the steel plate, the cooling pattern or temperature history determined by the setting calculation, and the particle size. , Dislocation density, fractions of each metal structure such as austenite, ferrite, and pearlite, numerical values related to mechanical properties such as yield stress and tensile strength, and valve opening / closing patterns for achieving cooling pattern or temperature history. It is possible to visually check on the same screen by graphs or numerical values and judge whether the setting calculation is normal or abnormal. Specifically, the error between the numerical value and the target value related to the mechanical properties predicted by the model based on the process parameter set value set in the setting calculation, and the predicted value and the target value of the winding temperature calculated by the setting calculation. You can check the error of.

<Editorial department>
Next, the editorial unit 32 will be described. The operator changes some of the process parameters obtained by the setting calculation as necessary to avoid risks such as product quality defects that greatly deviate from the target value and rolling troubles that cause rolling stoppage. Intervene. The operator uses a plurality of HMI 16s installed in the palpit to perform process parameter change intervention.

Here, when correcting the error between the numerical value and the target value related to the mechanical properties predicted based on the process parameter set value set in the setting calculation, the cooling pattern shown in the center left area 62 of the monitor 33 is shown. Alternatively, a part of the temperature history diagram is selected and moved to change the cooling pattern or the temperature history diagram.

The editorial unit 32 can change the cooling pattern or temperature history displayed on the monitor 33 by the display unit 31 by operating the input interface 34 by the operator. The cooling pattern or temperature history changed by the HMI 16 is transmitted to the rolling setting computer 14 as a change to the process parameters. The rolling setting computer 14 recalculates each physical model formula again, subject to satisfying the changed cooling pattern or temperature history. The display unit 31 updates the screen based on the result of the coupled calculation again by the rolling setting computer 14.

For example, as shown in FIG. 7, a change input operation is performed using the operation end of the HMI 16 so that the cooling rate C becomes the cooling rate C'. It is desirable that the change input operation is performed by an operation end such as a so-called keyboard or mouse provided in the HMI 16. Further, the operation end may be such that the operator can directly touch the surface of the display screen with his / her finger to operate. With the changed cooling pattern or temperature history, for example, the parameters related to the cooling rate pattern are changed. The setting calculation is performed according to the changed parameters, and the cooling pattern displayed in the center left part of the HMI 16 or the cooling pattern superposed on the temperature history or the temperature history of each metal structure such as austenite, ferrite, and pearlite of the steel sheet. A continuous cooling transformation diagram showing the beginning and end of the phase transformation, the particle size, dislocation density, fraction of each metal structure such as austenite, ferrite, and pearlite in the cooling pattern or temperature history of the steel plate shown in the center right part of HMI16. , Update numerical values related to mechanical properties such as yield stress and tensile strength. In addition, the valve opening / closing pattern of the water injection valve of each cooling bank shown at the bottom of the HMI 16 is also recalculated or updated with the numerical value indexed again from the process parameter table that stores the parameters as the cooling pattern or temperature history changes. Will be done.

The process parameter set value does not necessarily have to be used for controlling rolling in the hot rolling line, and may be output to the HMI 16 only for the purpose of confirming the process parameter set value in the rolling setting computer 14 by the operator. In this case, the hot rolling instruction information 15 does not necessarily have to be the information transmitted from the host computer, and as shown in FIG. 8, the operator directly inputs the hot rolling instruction information 15 and transmits it to the rolling setting computer 14. You may. That is, the operator uses the material control support device 30 according to the present invention to set the process parameter set value in the virtual steel plate, the resulting particle size, dislocation density, and each metal structure such as austenite, ferrite, and pearlite. It is possible to simulate numerical values related to mechanical properties such as fractions, yield stress and tensile strength.

When the operator inputs the hot rolling instruction information 15 shown in FIG. 8, the operator may directly input and edit the information based on his / her own experience, or the information (actual results) of the past rolled steel sheets accumulated in the rolling record database 18. Data) may be referred to. When referring to the information of the steel sheet rolled in the past, for example, as shown in FIG. 9, the alloy composition and dimensions of the steel sheet, the target plate thickness, the target plate width, the slab temperature rise pattern in the heating furnace, and the like. By inputting the conditions desired by the operator among the information included in the hot rolling instruction information 15 such as the heating furnace outlet side temperature, the finish exit side target temperature, the finish input side target temperature, the cooling pattern, and the winding target temperature. Information on past rolled steel sheets that meet the conditions can be referred to. In addition, a part of the referenced information may be input and edited after that.

For example, as in the example of FIG. 9, when the target plate thickness is input and set from the _upper limit Hupper to the lower limit H _lower as the search condition, the steel plates that meet the input and set conditions are displayed in the rolled steel plate information list. Based on the information of these steel sheets, other information is input as the determined condition. The operator sends this determined condition as hot rolling instruction information 15 to the rolling setting computer 14, and the process parameter setting value, the resulting particle size, dislocation density, fraction of each metal structure such as austenite, ferrite, and pearlite. In addition, it is possible to simulate numerical values related to mechanical properties such as yield stress and tensile strength.

In this way, it is possible to study and determine process parameter settings to satisfy the desired mechanical properties. Experienced operators can make appropriate changes immediately, backed by years of experience. In addition, even a relatively inexperienced operator can make changes through trial and error while referring to the information displayed on the screen, and can accumulate trial and error as experience. As described above, according to the material control support device according to the present invention, it is possible to support the determination of the process parameter setting value for satisfying the desired mechanical properties without being influenced by the degree of experience of the operator.

It should be noted that all of the embodiments described so far are exemplary, and conditions for satisfying desired mechanical properties can be determined by displaying and inputting operations other than the process parameter group shown in the embodiments. You may support the review.

The HMI 16 in the first embodiment described above has an editing unit 32, but may have a configuration that does not have an editing unit 32.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be variously modified and implemented without departing from the spirit of the present invention.

1 Slab heating furnace 2 Steel plate 3 Rolling line 4 Rough rolling machine 5 Finishing rolling mill 6 Edger 7 Roughing side thermometer 9 Finishing side thermometer 10 Finishing side thermometer 11 Runout table 12 Koira inlet thermometer 13 Koira 14 Rolling Setting computer 15 Thermometer instruction information 17 Process parameter table 18 Rolling record database 20a to 20d Cooling bank 22 Nozzle 21a to 21d Header 23a to 23d Water injection valve 30 Material control support device 31 Display unit 32 Editing unit 33 Monitor 34 Input interface 61 Upper area 62 Center left area 63 Center right area 64 Lower area

Claims (4)

Based on the hot rolling command information, the hot rolling line can be calculated by coupled calculation of each physical model formula expressing the process model, transfer model, temperature model, and material model in the hot rolling line for processing metal materials. A setting calculation unit that predicts and calculates the process parameter setting values for control, the temperature of the metal material at each location or time, the microstructure, and the final product material.
The hot rolling instruction information, the process parameter setting value, the temperature of the metal material at each place or time, the microstructure, and the display unit for displaying the final product material on the same screen are provided .
The hot rolling line includes a finishing rolling mill for rolling the metal material and a coiler for winding the metal material in order from the upstream.
The hot rolling instruction information includes a cooling pattern from the exit side of the finish rolling mill to the entry side of the coiler.
The temperature of the metallic material at each of the locations or times includes a predicted temperature history from the exit side of the finish rolling mill to the entry side of the coiler.
The microstructure comprises a fraction of the metal structure of the metal material in the cooling pattern or temperature history.
The final product material includes numerical values related to the mechanical properties of the final product .
An editorial unit capable of changing the cooling pattern or the temperature history by selecting and moving a part of the cooling pattern or the temperature history diagram displayed on the screen by the display unit is further provided.
The setting calculation unit recalculates each of the physical model formulas on the condition that the changed cooling pattern or the temperature history is satisfied.
The display unit updates the screen based on the result of the coupled calculation again by the setting calculation unit.
A material control support device for metallic materials. The hot rolling line comprises a run-out table capable of injecting water into the metal material between the finishing rolling mill and the coiler.
The process parameter set value includes a valve opening / closing pattern of the water injection valve of the runout table for achieving the cooling pattern or the temperature history.
The material control support device for a metallic material according to claim 1 . The display unit superimposes and displays a continuous cooling transformation diagram showing the beginning and end of the phase transformation of the metal structure on the cooling pattern or the temperature history.
The material control support device for a metallic material according to claim 1 or 2 . Further equipped with a rolling record database that accumulates the record data of the hot rolling line,
The hot rolling instruction information can be manually edited based on the actual data accumulated in the rolling actual database.
The material control support device for a metallic material according to any one of claims 1 to 3 .

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