JP7392493B2 - Shape control system for rolled materials - Google Patents

Description

The present invention relates to a shape control system for controlling the flatness of a rolled material such as metal foil.

In general shape control of a rolled material, the amount of operation of a control actuator is set based on the shape deviation. The shape deviation is the difference between the actual shape of the rolled material obtained by the shape meter and the target shape. The shape meter is installed in each zone divided into a plurality of zones in the lengthwise direction of the roll body. In other words, the actual shape is obtained for each zone. Calculation of the shape deviation and setting of the manipulated variable are also performed for each zone. Examples of control actuators include roll benders, levelers, and coolant sprays.

Roll benders control flatness by changing the deflection of the mill rolls. Leveling controls flatness by manipulating the difference between the left and right roll gaps. Coolant spray has nozzles for each zone. Coolant spray controls flatness by adjusting the flow rate of coolant injected from these nozzles. Alternatively, the coolant spray controls flatness by switching the nozzle valve open and closed.

When rolling a metal foil such that the sheet thickness at the exit side of the rolling mill is about 10 μm, the upper and lower rolling rolls come into contact with each other at the outer side of both ends in the sheet width direction. Therefore, shape control using coolant spray is more suitable for rolling such metal foil than shape control using roll bender or leveling.

In shape control using coolant spray, the coolant injection flow rate is increased or decreased based on the shape deviation calculated for each zone. Alternatively, the opening and closing of the valve is switched based on a determination as to whether the shape deviation in the vicinity of the nozzle exceeds a threshold value. This switching may be performed based on the flow rate in a prespecified control cycle. The flow rate is the ratio of the open period to the control period multiplied by 100.

A case will be described in which opening and closing of the valve can be switched based on the result of comparing the shape deviation and the threshold value. If there is a zone where the actual shape is looser than the target shape, the valve corresponding to that zone is controlled to be open. Then, the coolant locally suppresses the thermal expansion of the rolling rolls and alleviates the loose state. On the other hand, if there is a zone where the actual shape is tighter than the target shape, the valve corresponding to that zone is controlled to be closed. This locally promotes thermal expansion of the rolling rolls and relieves the tight state.

By the way, in aluminum foil rolling, execution of shape control using coolant spray may cause an effect opposite to the above-mentioned flattening effect. Regarding this adverse effect, Japanese Patent Application Laid-Open No. 2009-274101 discloses a phenomenon in which the loose state of the valve continues to progress even though the valve is controlled to be in the open state. This publication also discloses valve control to address adverse effects. In this valve control, the degree of shape deviation when the valve is controlled to be open is compared with that when the valve is controlled to be closed. Then, all the valves are uniformly controlled so as to be in a state showing a smaller degree.

Japanese Patent Application Publication No. 2009-274101

However, the phenomenon in which shape control using coolant spray backfires does not necessarily occur over the entire width of the rolled material. That is, the opposite effect may occur only in a part of the region in the board width direction. Therefore, the technique disclosed in the above-mentioned publication, which uniformly controls all valves to open or close, cannot control the shape of the rolled material to the target shape when a partial adverse effect occurs.

The present invention has been made in view of the above-mentioned problems, and even if a phenomenon in which shape control using coolant spray backfires occurs in some areas in the sheet width direction, it is possible to achieve the actual shape as the target. The aim is to provide a system that can maintain its shape.

The first invention is a shape control system for rolled material, which has the following features.
The shape control system includes a rolling roll, a measuring device, a plurality of nozzles, a control device, and a storage device .
The measuring device is provided on the exit side of the rolling roll and in each of a plurality of zones divided in the lengthwise direction of the barrel of the rolling roll. The measuring device measures the actual shape of the rolled material for each of the plurality of zones.
The plurality of nozzles are provided on the entrance side of the rolling roll and for each of the plurality of zones. The plurality of nozzles inject coolant toward the plurality of zones, respectively.
The control device performs shape control that individually controls coolant injection operations by the plurality of nozzles based on the deviation between the actual shape and the target shape.
The storage device stores a switch table and a nozzle table. The switch table shows the relationship between the basic operation or reverse operation of the injection operation and the grade classification of the rolled material. The nozzle table shows the relationship between the nozzles targeted for the basic operation or the reversal operation and the plate width divisions of the rolled material.
In the shape control, the control device includes:
By referring to the switch table using the grade classification of the rolled material to be rolled by the rolling roll and referring to the nozzle table using the plate width classification of the rolled material, individual selecting the basic operation or the reverse operation as the injection operation;
For a nozzle for which the basic operation is selected, if the deviation is smaller than the threshold, the coolant injection flow rate from the nozzle is set to a predetermined flow rate, and if the deviation is larger than the threshold, the coolant injection flow rate is set to a predetermined flow rate. Set the coolant injection flow rate from the nozzle to the lowest flow rate,
For the nozzle for which the reversal operation is selected, if the deviation is larger than the threshold value, the coolant injection flow rate from the nozzle is set to the predetermined flow rate, and if the deviation is smaller than the threshold value, the coolant injection flow rate from the nozzle is set to the predetermined flow rate. sets the coolant injection flow rate from the nozzle to the minimum flow rate.

The second invention further has the following features in the first invention.
The control device further performs inversion learning processing.
In the reversal learning process, information on the nozzles targeted for the basic operation or reversal operation in the nozzle table is updated based on the deviation in a predetermined learning period.

According to the first invention, shape control is performed in which coolant injection operations by a plurality of nozzles are individually controlled based on the deviation between the actual shape and the target shape. In this shape control, a switch table is referenced using the grade classification of the rolled material rolled by the rolling rolls , and a nozzle table is referenced using the strip width classification of the rolled material. The basic operation or the reverse operation is selected as the injection operation. Here, the switch table shows the relationship between the basic operation or reverse operation of the injection operation and the grade classification of the rolled material, and the nozzle table shows the relationship between the nozzle targeted for the basic operation or reverse operation and the rolling material. This shows the relationship with the board width classification of the material. For nozzles whose basic operation is selected by referring to these tables , the coolant injection flow rate is set to the predetermined flow rate if the deviation is smaller than the threshold value, and the coolant injection flow rate is set to the minimum if the deviation is larger than the threshold value. Set to flow rate. On the other hand, for nozzles for which reverse operation is selected by referring to these tables , the coolant injection flow rate is set to the predetermined flow rate if the deviation is larger than the threshold value, and the coolant injection flow rate is set to the predetermined flow rate if the deviation is smaller than the threshold value. is set to the lowest flow rate.

The basic operation and the reverse operation are completely opposite in the manner in which the coolant is injected based on the comparison result of the magnitude relationship between the deviation and the threshold value. Therefore, the relationship between the basic operation or reversal operation on the switch table and the grade classification of the rolled material, and the relationship between the nozzle targeted for the basic operation or reversal operation on the nozzle table and the strip width classification of the rolled material are By setting correctly, it becomes possible to accurately inject coolant to a zone where a flattening effect is obtained and a zone where the opposite effect is produced. Therefore, even if the effect obtained by coolant injection is reversed between some regions and other regions of the rolled material, it is possible to maintain the actual shape to the target shape. Therefore, it becomes possible to improve the product quality of the rolled material.

According to the second invention, a reversal learning process is performed. According to the inversion learning process, it is possible to periodically verify whether a flattening effect can be obtained by the basic operation or the inversion operation. Therefore, it is possible to suppress the occurrence of variations in product quality due to fine adjustments made to the rolling rolls or changes in rolling conditions during rolling of the rolled material.

1 is a diagram showing a configuration example of a shape control system according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram of a main part of a rolling line to which the coolant spray and shape measuring device shown in FIG. 1 are applied. It is a figure explaining the basic operation of a nozzle. It is a figure explaining the 1st problem of the basic operation of a nozzle. It is a figure explaining the second problem of the basic operation of a nozzle. It is a figure which shows an example of a reversal switch table. It is a figure which shows an example of a reversal nozzle table. It is a flowchart explaining the flow of processing when shape control is performed. It is a figure showing the example of composition of the shape control system concerning Embodiment 2 of the present invention. 7 is a timing chart showing a first example of reversal learning processing. 7 is a timing chart showing a second example of reversal learning processing.

Embodiments of the present invention will be described below with reference to the drawings.

1. Embodiment 1
First, Embodiment 1 will be described with reference to FIGS. 1 to 8.

1-1. Description of System Configuration FIG. 1 is a diagram illustrating the configuration of a shape control system (hereinafter also simply referred to as "system") according to the first embodiment. As shown in FIG. 1, the system 100 includes a coolant spray 10, a setting calculation device 20, a shape control device 30, a storage device 40, a spray control device 50, and a shape measuring device 60. .

The coolant spray 10 and the shape measuring instrument 60 will be explained with reference to FIG. 2. FIG. 2 is a schematic diagram of the main parts of the rolling line to which the coolant spray 10 and the shape measuring instrument 60 are applied. A rolling line 70 shown in FIG. 2 uses a single-stand type rolling mill 72 to roll a rolled material 71 to about 10 μm (foil rolling). In addition, although the rolling mill 72 is a four-stage type in FIG. 2, the number of stages of the rolling mill 72 is not particularly limited, and may be a two-stage type or a six-stage type.

The coolant spray 10 includes an upper spray 11 and a lower spray 12. The upper spray 11 is equipped with a plurality of nozzles 11a to 11j on the surface facing the rolling mill 72. Coolant is injected from these nozzles. When the coolant is injected, the upper rolling roll 73 of the rolling mill 72 is cooled. The lower spray 12 has the same number of nozzles as the upper spray 11 has. Coolant is injected from these nozzles. When the coolant is injected, the lower roll 74 of the rolling mill 72 is cooled.

The shape measuring device 60 is installed on the exit side of the rolling mill 72. The shape measuring instrument 60 has zones 60a to 60j divided in the longitudinal direction of its body. The shape measuring device 60 measures the load in the width direction of the rolled material 71 for each zone 60a to 60j and calculates the tension. Hereinafter, the tension calculated for each zone 60a to 60j will also be referred to as "actual shape SA." The flatness of the rolled material 71 in the sheet width direction is expressed as a deviation from the average value of the actual shape SA. The more uniform the actual shape SA is, the smaller the flatness becomes.

The number of zones 60a to 60j matches the number of nozzles 11a to 11j. That is, the upper spray 11 is divided in the same way as the shape measuring device 60. Furthermore, nozzles 11a to 11j correspond to zones 60a to 60j, respectively. This correspondence also holds true between the lower spray 12 and the shape measuring device 60. Two or more nozzles may be assigned to one zone. In this case, the total number of nozzles that the upper spray 11 or the lower spray 12 has is expressed as k times the total number of zones (k is an integer of 2 or more).

Returning to FIG. 1, the configuration of the system 100 will be explained. The setting calculation device 20 is a computer having at least a processor, a memory, and an input/output interface. The setting calculation device 20 calculates setting values for various equipment in the rolling line. The various equipment includes hot rolling equipment, cold rolling equipment, foil rolling equipment, etc. The rolling mill 72 corresponds to foil rolling equipment.

The set values include various target values of the rolled material at the exit side of various equipment. The various target values include target values for plate thickness and plate width. The target values at the exit side of the foil rolling equipment include target values for the tension for each zone 60a to 60j. Hereinafter, the target value of tension for each zone 60a to 60j will also be referred to as "target shape ST." The setting calculation device 20 transmits rolling information to the shape control device 30. The rolling information includes information regarding set values.

The shape control device 30 is a computer that includes at least a processor, a memory, and an input/output interface. The shape control device 30 includes a shape deviation calculation function 31, a manipulated variable calculation function 32, and a reversal determination function 33 as processor functions.

The shape deviation calculation function 31 calculates the deviation between the actual shape SA from the shape measuring instrument 60 and the target shape ST from the setting calculation device 20 (hereinafter also referred to as "shape deviation SD") for each zone 60a to 60j. calculate. Calculation of the shape deviation SD is performed every predetermined control cycle. Information on the shape deviation SD is transmitted to the operation amount calculation function 32.

The operation amount calculation function 32 calculates the operation amount of each nozzle of the coolant spray 10 based on the result of comparison between the shape deviation SD and the threshold value TH (≦0). For example, if there is a zone (that is, a loose zone) in which the actual shape SA shows a smaller value than the target shape ST, the sign of the shape deviation SD (=SA-ST) of that zone becomes negative. When the shape deviation SD of the zone shows a value smaller than the threshold value TH, the operation amount calculation function 32 calculates the operation amount of the nozzle corresponding to this zone according to the absolute value AV (=|SD-TH|) of the deviation between the two. Set. On the other hand, when the shape deviation SD of the zone shows a value larger than the threshold value TH, the operation amount calculation function 32 sets the operation amount of the nozzle corresponding to this zone to the lowest value. The "minimum value" is the nozzle operation amount for making the coolant injection flow rate the lowest flow rate (for example, zero or a flow rate close to zero).

As another example, if there is a zone (that is, a tight zone) in which the actual shape SA shows a larger value than the target shape ST, the sign of the shape deviation SD of that zone becomes positive. Since the sign of the threshold TH is negative, the shape deviation SD of this zone is larger than the threshold TH. Therefore, in this case, the operation amount calculation function 32 sets the operation amount of the nozzle corresponding to this zone to the lowest value.

In the case of a nozzle that injects coolant by opening and closing a valve, the operation amount calculation function 32 switches the opening and closing state of the valve based on the result of comparing the shape deviation SD and the threshold value TH. For example, if there is a zone in which the actual shape SA shows a smaller value than the target shape ST, the sign of the shape deviation SD of that zone becomes negative. When the shape deviation SD of the zone shows a value smaller than the threshold value TH, the operation amount calculation function 32 sets the valve of the nozzle corresponding to this zone to the open state. On the other hand, when the shape deviation SD of the zone shows a value larger than the threshold value TH, the operation amount calculation function 32 sets the valve of the nozzle corresponding to this zone to the closed state.

As another example, if there is a zone in which the actual shape SA has a larger value than the target shape ST, the sign of the shape deviation SD of that zone becomes positive. Since the sign of the threshold TH is negative, the shape deviation SD of this zone is larger than the threshold TH. Therefore, in this case, the operation amount calculation function 32 sets the valve of the nozzle corresponding to this zone to the closed state.

The operation amount calculation function 32 transmits the nozzle operation amount to the spray control device 50 as operation amount information. When receiving the reversal determination information from the reversal determination function 33, the operation amount calculation function 32 changes the operation amount information based on the reversal determination information before sending the operation amount information to the spray control device 50. For example, if the manipulated variable is set according to the absolute value AV, the manipulated variable calculation function 32 changes this manipulated variable to the lowest value. On the other hand, when the manipulated variable is set to the lowest value, the manipulated variable calculation function 32 changes the manipulated variable to the manipulated variable according to the deviation between the shape deviation SD and the threshold value TH. The operation amount calculation function 32 transmits the changed operation amount information to the spray control device 50.

As another example, the operation amount calculation function 32 transmits the open/closed state of the valve to the spray control device 50 as operation amount information. When receiving the reversal determination information from the reversal determination function 33, the operation amount calculation function 32 changes the operation amount information based on the reversal determination information before sending the operation amount information to the spray control device 50. For example, when the valve is set to the open state, the operation amount calculation function 32 switches the setting state from the open state (ON) to the closed state (OFF). When the valve is set in the closed state, the operation amount calculation function 32 switches the setting state from the closed state (OFF) to the open state (ON).

The reversal determination function 33 determines, based on the reversal switch table 41 stored in the storage device 40, whether the execution of the shape control will have an adverse effect. The reversal determination function 33 also determines for each nozzle whether or not the coolant injection operation by the nozzle is to be reversed, based on the reversal nozzle table 42 stored in the storage device 40 . The reversal determination function 33 transmits information indicating these determination results to the operation amount calculation function 32 as reversal determination information. Details of the reversing switch table 41, reversing nozzle table 42, shape control, flattening effect, and reverse effect will be described later.

The spray control device 50 individually controls the coolant injection operation of each nozzle of the coolant spray 10 based on the manipulated variable information from the manipulated variable calculation function 32 .

1-2. Shape Control In the first embodiment, the setting calculation device 20, the shape control device 30, and the spray control device 50 correspond to the "control device" of the present invention that executes shape control of the rolled material. Hereinafter, shape control based on the configuration of the coolant spray 10 performed by switching the setting state of the valve between ON and OFF will be described.

1-2-1. Basic Operation As described in the explanation of the manipulated variable calculation function 32, in the shape control, the coolant injection operation by the nozzle is determined based on the result of the comparison between the shape deviation SD and the threshold value TH. A nozzle operation that injects coolant according to the absolute value AV when the shape deviation SD shows a value smaller than the threshold value TH, and injects the coolant at the lowest flow rate when the shape deviation SD shows a larger value than the threshold value TH, Hereinafter, this will also be referred to as "basic operation."

FIG. 3 is a diagram explaining the basic operation. FIG. 3 shows a first example of distribution of shape deviation SD before and after execution of shape control. The vertical direction in FIG. 3 indicates the shape deviation SD. The horizontal direction in FIG. 3 indicates the position of the rolled material in the board width direction. Each data of the shape deviation SD arranged in the board width direction is calculated for each zone of the shape measuring device 60.

The upper part of FIG. 3 shows the shape deviation SD before the shape control is executed. In this upper stage, the shape deviation SD of several zones at both ends of the rolled material shows a value smaller than the threshold value TH. On the other hand, the shape deviation SD of some zones in the center of the rolled material exhibits a value larger than the threshold value TH.

When the shape control is executed, the valves of the nozzles corresponding to the zones at both ends are set to the open state. On the other hand, the valves of the nozzles corresponding to the central zone are set to the closed state. As a result, coolant is injected from the nozzles corresponding to the zones at both ends at a predetermined flow rate, and coolant is injected from the nozzles corresponding to the center zone at the lowest flow rate. Note that the predetermined flow rate is preset as a coolant injection flow rate that is higher than the minimum flow rate.

The lower part of FIG. 3 shows the shape deviation SD after the shape control is executed. In this lower stage, the shape deviations SD at both ends are reduced, and some shape deviations SD exhibit values larger than the threshold value TH. The reason for this is that the coolant is injected from the nozzles corresponding to the zones at both ends at a predetermined flow rate, and the zones of the rolling roll corresponding to these zones are cooled by the coolant and thermal expansion is locally suppressed. I'm here because I'm going to be killed.

In the example shown in the lower part of FIG. 3, the shape deviation SD at the center is reduced as well as the shape deviation SD at both ends. However, some shape deviations SD exhibit values smaller than zero. Further, some of the shape deviations SD have values smaller than the threshold TH. The reason for this is that the coolant is injected from the nozzles corresponding to the central zones at the lowest flow rate, thereby locally promoting thermal expansion of the zones of the mill roll corresponding to these zones.

1-2-2. First Problem of Basic Operation FIG. 4 is a diagram showing a second distribution example of shape deviation SD before and after execution of shape control. The distribution example shown in the upper part of FIG. 4 is the same as the distribution example shown in the upper part of FIG. Therefore, if shape control having the same contents as the shape control explained in FIG. 3 is executed, the same distribution example as shown in the lower part of FIG. 3 should be shown in the lower part of FIG.

However, as shown in the lower part of FIG. 4, the shape deviation SD at both ends does not decrease, but rather increases. The shape deviation SD at the center also shows the same tendency as that at both ends. In other words, an effect opposite to the flattening effect described in the lower part of FIG. 3 is produced.

1-2-3. Second Problem of Basic Operation FIG. 5 is a diagram showing a third example of distribution of shape deviation SD before and after execution of shape control. The distribution example shown in the upper part of FIG. 5 is the same as the distribution example shown in the upper part of FIG. Therefore, if shape control with the same contents as the shape control explained in FIG. 3 is executed, the same distribution example as shown in the lower part of FIG. 3 should be shown in the lower part of FIG.

However, as shown in the lower part of FIG. 5, the shape deviation SD at both ends does not decrease, but rather increases. On the other hand, the shape deviation SD in the central portion decreases. In other words, the flattening effect described in the lower part of FIG. 3 is obtained at the center, and the opposite effect is obtained at both ends.

1-3. Improvements in Shape Control Therefore, in the shape control of the first embodiment, a reversal switch table is set that defines the relationship between the grade classification of the rolled material and the reversal operation. The reversal operation is a nozzle operation in which the coolant injection operation is reversed from the basic operation. The reversal switch table is created, for example, by separately performing rolling with different material classifications and identifying zones where the opposite effect is produced. An inversion switch table may be created by identifying zones where a flattening effect can be obtained.

FIG. 6 is a diagram showing an example of a reversal switch table. As shown in FIG. 6, the reversal switch table 41 is a table that defines reversal switches (ON or OFF) for each material classification (AA, BB, CC, DD, EE, . . . ). According to the reversal switch table 41, when the reversal switch indicates OFF, the basic operation is selected. When the inversion switch indicates ON, inversion operation is selected. Information indicating the selected nozzle operation is included in the above-mentioned reversal determination information.

In another example, a basic switch table is set instead of the inversion switch table 41. The basic switch table is a table that defines basic switches (ON or OFF) for each material classification (AA, BB, CC, DD, EE, . . . ). According to the basic switch table, when the basic switch indicates ON, the basic operation is selected. If the basic switch indicates OFF, inverting operation is selected. The inversion switch table 41 or the basic switch table corresponds to the "switch table" of the present invention.

Further, in the shape control of the first embodiment, a reversal nozzle table is set that defines the relationship between the sheet width division of the rolled material and the nozzle that performs the reversal operation. The reversal nozzle table is created by separately rolling a rolled material with different strip width classifications that have zones where the flattening effect cannot be obtained by shape control, and by identifying zones where the flattening effect cannot be obtained by shape control. Ru.

FIG. 7 is a diagram showing an example of a reversal nozzle table. As shown in FIG. 7, the reversing nozzle table 42 is a table that defines nozzles that perform reversing operations for each board width division (1, 2, 3, 4, 5, . . . ). According to the reversing nozzle table 42, when the reversing switch indicates ON, a nozzle to be subjected to reversing operation is specified. Information indicating the specified nozzle is included in the above-mentioned reversal determination information. Note that nozzles other than the nozzles specified in the inversion nozzle table 42 are targeted for basic operation.

In another example, instead of the inverted nozzle table 42, a basic nozzle table is set. The basic nozzle table is a table that defines nozzles that perform basic operations for each board width division (1, 2, 3, 4, 5, . . . ). According to the basic nozzle table, when the basic switch indicates OFF, the nozzle that is the target of the basic operation is specified. Information indicating the specified nozzle is included in the above-mentioned reversal determination information. Note that nozzles other than the nozzles specified in the basic nozzle table are subjected to the reversal operation.

1-4. Specific Processing FIG. 8 is a flowchart illustrating the flow of processing when the processor of the shape control device 30 performs the shape control according to the first embodiment. The routine shown in FIG. 8 is repeatedly executed at a predetermined control cycle. The routine shown in FIG. 8 is executed independently for each nozzle of the coolant spray 10.

In the routine shown in FIG. 8, first, it is determined whether the reversing switch is ON (step S1). The process in step S1 is performed by referring to the reversal switch table 41 using the grade classification of the rolled material currently being rolled. Instead of the inversion switch table 41, a basic switch table may be used. Note that the information regarding the grade classification is included in the rolling information from the setting calculation device 20.

If the determination result in step S1 is affirmative, it is determined whether or not the nozzle that this routine focuses on is the target of the reversal operation (step S2). The process in step S2 is performed by referring to the reversal nozzle table 42 using the strip width classification of the rolled material currently being rolled. Instead of the inverted nozzle table 42, a basic nozzle table may be used. Note that the information regarding the strip width classification is included in the rolling information from the setting calculation device 20.

If the determination result in step S1 or S2 is negative, it is determined whether the shape deviation SD is smaller than the threshold TH (step S3). If the determination result in step S1 or S2 is negative, it means that the nozzle that this routine focuses on is the target of the basic operation. Therefore, if the determination result in step S3 is positive, the valve is set to the open state (step S4). On the other hand, if the determination result in step S3 is negative, the valve is set to a closed state (step S5).

If the determination result in step S2 is positive, it is determined whether the shape deviation SD is larger than the threshold TH (step S6). If the determination result in step S2 is affirmative, it means that the nozzle that this routine focuses on is the target of the reversal operation. If the determination result in step S6 is positive, the valve is set to the open state (step S7). On the other hand, if the determination result in step S6 is negative, the valve is set to a closed state (step S8).

1-5. Effects According to the shape control of the first embodiment described above, the coolant injection operation is determined for each nozzle by referring to the reversal switch table 41 and the reversal nozzle table 42. Therefore, it is possible to individually control the injection operation to bring the shape deviation SD in each zone close to zero not only when a flattening effect is obtained by shape control, but also when an adverse effect is produced. Therefore, it becomes possible to improve the product quality of the rolled material.

2. Embodiment 2
Next, a second embodiment will be described with reference to FIGS. 9 to 11. Note that content that overlaps with the content described in Embodiment 1 will be omitted as appropriate.

2-1. Description of System Configuration FIG. 9 is a diagram illustrating the configuration of a system according to the second embodiment. The basic configuration of system 200 shown in FIG. 9 is the same as that of system 100 shown in FIG. The difference between the system 100 and the system 200 is that an inversion learning function 34 is added as a function of the processor of the shape control device 30.

The reversal learning function 34 performs reversal learning processing. The reversal learning process may be performed while the rolled material 71 is being rolled, or may be performed while the rolled material 71 is being prepared for rolling. In the reversal learning process, the evaluation value ESD is calculated using the shape deviation SD received from the shape measuring device 60 during a predetermined learning period. An example of this learning period is a period in which the speed of the rolled material 71 is stable and the reversing switch is not switched. In the reversal learning process, it is also determined based on the evaluation value ESD whether or not the information in the reversal nozzle table 42 is updated. All nozzles of the coolant spray 10 are subjected to the inversion learning process. The reversal learning process will be explained below.

2-2. Reversal Learning Process FIG. 10 is a timing chart showing a first example of the reversal learning process. FIG. 11 is a timing chart showing a second example of the reversal learning process. Note that the period between times T1 and T10 shown in FIGS. 10 and 11 corresponds to a learning period under steady conditions. As shown in FIGS. 10 and 11, the reversal switches in the reversal switch table 41 are in the ON state between times T1 and T10.

In the examples shown in FIGS. 10 and 11, the reversal operation is selected for the nozzle targeted for the reversal learning process. In the example shown in FIG. 10, the valve is set in the open state between times T1 and T6, and the valve is set in the closed state between times T6 and T10. In the example shown in FIG. 11, the valve is set to the open state between times T1 and T4, and the valve is set to the closed state between times T4 and T10.

The evaluation value ESD is calculated based on the amount of change ΔSA of the actual shape SA. The amount of change ΔSA is calculated by subtracting the actual shape SA(n) at the current time Tn from the actual shape SA(n-1) at the previous time Tn-1 (2≦n≦10). The evaluation value ESD is expressed as the sum of the values obtained by multiplying the amount of change ΔSA by a coefficient set according to the setting state of the valve (+1 when the setting state is ON, -1 when the setting state is OFF). .

In the example shown in FIG. 10, the actual shape SA continues to change to the loose side during times T1 to T6 when the valve is set to ON (open state). Since the smaller the tension, the looser the actual shape SA is, the sign of the amount of change ΔSA between times T1 to T6 is positive. Therefore, the evaluation value ESD, which is the sum of the values obtained by multiplying the amount of change ΔSA by a coefficient (=+1), increases between times T1 and T6.

On the other hand, the actual shape SA shows the loosest value at time T7, and changes to a tighter value thereafter. When this time T7 is taken as the current time, the previous time is time T6, and the valve is set to OFF (closed state) during this time. Therefore, although the sign of the amount of change ΔSA is positive, the evaluation value ESD, which is the sum of the values multiplied by the coefficient (=-1), decreases between times T6 and T7.

Between times T7 and T10, the valve is set to OFF (closed state), and the actual shape continues to change toward the tighter side. Since the larger the tension, the tighter the actual shape SA is, the sign of the amount of change ΔSA between times T7 and T10 is negative. Therefore, the evaluation value ESD, which is the sum of the values obtained by multiplying the amount of change ΔSA by a coefficient (=-1), increases between times T7 and T10.

In the example shown in FIG. 11, the actual shape SA continues to change to the loose side during times T1 to T4 when the valve is set to ON (open state). Since the smaller the tension, the looser the actual shape SA is, the sign of the amount of change ΔSA between times T1 to T4 is positive. Therefore, the evaluation value ESD, which is the sum of the values obtained by multiplying the amount of change ΔSA by a coefficient (=+1), increases between times T1 and T4.

The actual shape SA continues to change toward the loose side even after time T4. Therefore, the sign of the amount of change ΔSA after time T4 is positive. However, the valve is set to OFF after time T4. Therefore, the evaluation value ESD, which is the sum of the values obtained by multiplying the amount of change ΔSA by a coefficient (=-1), continues to decrease after time T4.

In the reversal learning process, information in the reversal nozzle table 42 is updated based on a determination as to whether the evaluation value ESD during the learning period exceeds the allowable value AL. If the evaluation value ESD exceeds the allowable value AL (that is, in the case of the example shown in FIG. 10), it is determined that the information in the reversing nozzle table 42 is correct and that a flattening effect can be obtained by the reversing operation. Therefore, in this case, the information is not updated.

On the other hand, if the evaluation value ESD is less than the allowable value AL (that is, in the case of the example shown in FIG. 11), it is determined that the information in the reversing nozzle table 42 is incorrect and that the flattening effect cannot be obtained by the reversing operation. Ru. Therefore, in this case, the information in the reversal nozzle table 42 is updated. Specifically, information about the nozzle targeted for the reversal learning process is deleted from the reversal nozzle table 42.

Note that in the examples shown in FIGS. 10 and 11, the information in the inversion switch table 41 was updated based on the viewpoint of whether or not the flattening effect can be obtained by the inversion operation. However, information may be updated based on a perspective different from this perspective. For example, the information in the inversion switch table 41 may be updated based on whether a flattening effect can be obtained by the basic operation. By calculating the evaluation value ESD while the reversing switch indicates OFF and comparing it with the allowable value AL, it becomes possible to add information on the nozzles to be subjected to reversing operation to the reversing nozzle table 42.

When performing inversion learning processing using a basic switch table, the information in the switch table may be updated based on whether or not a flattening effect can be obtained by the basic operation. For example, while the basic switch indicates ON, the evaluation value ESD is calculated and compared with the allowable value AL. This makes it possible to delete information about nozzles to be subjected to reversal operation from the basic nozzle table. The information in the basic switch table may be updated based on whether or not a flattening effect can be obtained by the inversion operation. For example, while the basic switch indicates OFF, the evaluation value ESD is calculated and compared with the allowable value AL. This makes it possible to add information about nozzles to be subjected to basic operations to the basic nozzle table.

2-3. Effects According to the second embodiment described above, reversal learning processing is performed. According to the inversion learning process, it is possible to periodically verify whether a flattening effect can be obtained by the basic operation or the inversion operation. Then, depending on this verification result, it becomes possible to add or delete the nozzle targeted for the reversal learning process to the reversal nozzle table 42 (or the basic nozzle table). Therefore, it is possible to suppress the occurrence of variations in product quality due to fine adjustments made to the rolling mill 72 during rolling of the rolled material 71 or changes in rolling conditions.

10 Coolant spray 11 Upper spray 12 Lower spray 20 Setting calculation device 30 Shape control device 31 Shape deviation calculation function 32 Operation amount calculation function 33 Reversal judgment function 34 Reversal learning function 40 Storage device 41 Reversal switch table 42 Reversal nozzle table 50 Spray control device 60 Shape measuring instrument 60a to 60j Zone 70 Rolling line 72 Rolling mill 73 Upper rolling roll 74 Lower rolling roll 100,200 Shape control system

Claims (3)

a rolling roll;
a measuring instrument that is provided on the exit side of the roll and for each of a plurality of zones divided in the body length direction of the roll, and measures the actual shape of the rolled material for each of the plurality of zones;
a plurality of nozzles provided on the entrance side of the rolling roll and for each of the plurality of zones, each of which injects coolant toward the plurality of zones;
a control device that performs shape control that individually controls coolant injection operations by the plurality of nozzles based on the deviation between the actual shape and the target shape;
A switch table showing the relationship between the basic operation or reversal operation of the injection operation and the grade classification of the rolled material, the nozzle targeted for the basic operation or the reversal operation, and the relationship between the plate width classification of the rolled material. a nozzle table shown; a storage device storing;
Equipped with
In the shape control, the control device includes:
By referring to the switch table using the grade classification of the rolled material to be rolled by the rolling rolls and referring to the nozzle table using the plate width classification of the rolled material, individual selecting the basic operation or the reverse operation as the injection operation;
For a nozzle for which the basic operation is selected, if the deviation is smaller than the threshold value, the coolant injection flow rate from the nozzle is set to a predetermined flow rate, and if the deviation is larger than the threshold value, the coolant injection flow rate is set to a predetermined flow rate. Set the coolant injection flow rate from the nozzle to the lowest flow rate,
For the nozzle for which the reversal operation is selected, if the deviation is larger than the threshold value, the coolant injection flow rate from the nozzle is set to the predetermined flow rate, and if the deviation is smaller than the threshold value, the coolant injection flow rate from the nozzle is set to the predetermined flow rate. A shape control system for rolled material, characterized in that the injection flow rate of coolant from the nozzle is set to the minimum flow rate. The control device further performs a reversal learning process of updating information of the nozzle targeted for the basic operation or reversal operation in the nozzle table based on the deviation in a predetermined learning period. Item 1. Shape control system for rolled material according to item 1. The switch table specifies a plurality of zones in the body length direction of the roll roll where the flattening effect of the rolled material can be obtained by shape control in rolling with different grade classifications of the rolled material, or It is created by specifying a plurality of zones in the body length direction of the rolling roll that have an effect opposite to the flattening effect of the rolled material,
The nozzle table was created by identifying a plurality of zones in the body length direction of the rolling roll where the flattening effect of the rolled material by shape control cannot be obtained during rolling with different width divisions of the rolled material. is something
The shape control system for rolled material according to claim 1 or 2, characterized in that:

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