JP2021115589A - Shape control system for rolled material - Google Patents

Abstract

To provide a system capable of maintaining an actual shape in a target shape even when a phenomenon of execution of shape control with a coolant spray resulting in a negative outcome occurs in a partial area in a plate width direction.SOLUTION: A control device performs shape control for individually controlling an ejection operation of a coolant with a plurality of nozzles based on a deviation between an actual shape and a target shape. In the shape control, basic operation or reversal operation is selected as ejection operation based on a material category and plate width category. When the deviation is smaller than a threshold value for a nozzle for which the basic operation is selected, an ejection flow rate of the coolant from the nozzle is set at a prescribed flow rate, and otherwise, the ejection flow rate is set at a lowest flow rate. For a nozzle for which the reversal operation is selected, when the deviation is larger than the threshold value, the ejection flow rate of the coolant from the nozzle is set to a prescribed flow rate, and otherwise, the ejection flow rate is set to the lowest flow rate.SELECTED DRAWING: Figure 8

Description

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

In general shape control of rolled material, the operating amount of the 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 of a plurality of zones divided in the body length direction of the rolling roll. That is, the actual shape is obtained for each zone. The calculation of the shape deviation and the setting of the manipulated variable are also performed for each zone. Examples of control actuators include roll benders, leveling and coolant sprays.

The roll bender controls the flatness by changing the deflection of the rolling rolls. Leveling controls the flatness by manipulating the difference between the left and right roll gaps. The coolant spray has a nozzle for each zone. The coolant spray controls the flatness by adjusting the flow rate of the coolant injected from these nozzles. Alternatively, the coolant spray controls the flatness by switching the opening and closing of the nozzle valve.

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

In the shape control using the coolant spray, the injection flow rate of the coolant 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 the determination of whether or not the shape deviation in the vicinity of the nozzle exceeds the threshold value. This switching may be performed based on the flow rate in a predetermined control cycle. The flow rate is a value obtained by multiplying the ratio of the open period to the control cycle by 100.

A case where the opening and closing of the valve can be switched based on the result of comparison between the shape deviation and the threshold value will be described. 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 roll, and the loose state is alleviated. On the contrary, when 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. Then, the thermal expansion of the rolling roll is locally promoted, and the tight state is alleviated.

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

Japanese Unexamined Patent Publication No. 2009-274101

However, the phenomenon that the execution of shape control using the coolant spray backfires does not always occur in the entire area in the plate width direction of the rolled material. That is, the adverse effect may occur only in a part of the area in the plate width direction. Therefore, the technique of the above-mentioned publication that uniformly controls all valves to the open state or the closed state cannot control the shape of the rolled material to the target shape when a partial adverse effect is brought about.

The present invention has been made in view of the above-mentioned problems, and even when the phenomenon that the execution of shape control using the coolant spray backfires occurs in a part of the plate width direction, the actual shape is targeted. The purpose is to provide a system that can be maintained in shape.

The first invention is a shape control system for rolled materials, which has the following features.
The shape control system includes a rolling roll, a measuring instrument, a plurality of nozzles, and a control device.
The measuring instrument is provided on the exit side of the rolling roll and for each of a plurality of zones divided in the body length direction of the rolling roll. The measuring instrument measures the actual shape of the rolled material for each of the plurality of zones.
The plurality of nozzles are provided on the entry side of the rolling roll and for each of the plurality of zones. The plurality of nozzles each inject coolant toward the plurality of zones.
The control device performs shape control that individually controls the coolant injection operation by the plurality of nozzles based on the deviation between the actual shape and the target shape.
The control device is used in the shape control.
Based on the grade classification and the plate width classification, the basic operation or the reversing operation is selected as the injection operation, and the injection operation is selected.
For the nozzle for which the basic operation is selected, when the deviation is smaller than the threshold value, the injection flow rate of the coolant from the nozzle is set to a predetermined flow rate, and when the deviation is larger than the threshold value, the flow rate is set. Set the coolant injection flow rate from the nozzle to the minimum flow rate,
For the nozzle for which the reversing operation is selected, when the deviation is larger than the threshold value, the injection flow rate of the coolant from the nozzle is set to the predetermined flow rate, and when the deviation is smaller than the threshold value. Sets the injection flow rate of the coolant from the nozzle to the minimum flow rate.

The second invention further has the following features in the first invention.
The shape control system further includes a storage device.
The storage device has a nozzle table showing the relationship between the nozzles targeted for the basic operation or the reversing operation and the plate width division.
The control device further performs an inversion learning process.
In the reversal learning process, the information of the nozzle to be the target of the basic operation or the reversal operation in the nozzle table is updated based on the deviation in the predetermined learning period.

According to the first invention, shape control is performed in which the coolant injection operation by a plurality of nozzles is individually controlled based on the deviation between the actual shape and the target shape. In this shape control, a basic operation or a reversing operation is selected as the coolant injection operation by the plurality of nozzles based on the material type classification and the plate width classification. Then, in the nozzle for which the basic operation is selected, the coolant injection flow rate is set to a predetermined flow rate when the deviation is smaller than the threshold value, and the coolant injection flow rate is set to the minimum flow rate when the deviation is larger than the threshold value. NS. On the other hand, in the nozzle for which the reversing operation is selected, the coolant injection flow rate is set to a predetermined flow rate when the deviation is larger than the threshold value, and the coolant injection flow rate is set to the minimum flow rate when the deviation is smaller than the threshold value. NS.

In the basic operation and the inversion operation, the mode of coolant injection is opposite to the result of comparison of the magnitude relation between the deviation and the threshold value. Therefore, by correctly setting the relationship between the grade classification and the plate width classification and the basic operation and the reversing operation, the zone where the flattening effect is obtained and the zone where the opposite effect is brought about are accurately set. It becomes possible to inject coolant. Therefore, even if the effect obtained by injecting the coolant is reversed between a part of the rolled material and another region, the actual shape can be maintained at the target shape. Therefore, it is possible to improve the product quality of the rolled material.

According to the second invention, the inversion learning process is performed. According to the inversion learning process, it is possible to periodically verify whether or not the flattening effect of the basic operation or the inversion operation can be obtained. Therefore, it is possible to suppress the occurrence of variations in product quality due to fine adjustments made to the rolling rolls during rolling of the rolled material and changes in rolling conditions.

It is a figure which shows the structural example of the shape control system which concerns on Embodiment 1 of this invention. It is the schematic of the main part of the rolling line to which the coolant spray and a shape measuring instrument 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 2nd problem of the basic operation of a nozzle. It is a figure which shows an example of an inverting switch table. It is a figure which shows an example of a reversing nozzle table. It is a flowchart explaining the flow of processing when shape control is performed. It is a figure which shows the structural example of the shape control system which concerns on Embodiment 2 of this invention. It is a timing chart which shows the 1st example of the inversion learning process. It is a timing chart which shows the 2nd example of the inversion learning process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

1-1. Explanation of System Configuration FIG. 1 is a diagram illustrating a 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 described with reference to FIG. FIG. 2 is a schematic view of a main part of a rolling line to which the coolant spray 10 and the shape measuring instrument 60 are applied. In the rolling line 70 shown in FIG. 2, the rolled material 71 is rolled (foil rolled) to about 10 μm by a single-stand type rolling mill 72. In FIG. 2, the rolling mill 72 is a four-stage type, but 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 provided 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 includes the same number of nozzles as the upper spray 11 has. Coolant is injected from these nozzles. When the coolant is injected, the lower rolling roll 74 of the rolling mill 72 is cooled.

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

The number of zones 60a to 60j and the number of nozzles 11a to 11j match. That is, the upper spray 11 is divided in the same manner as the shape measuring instrument 60. Further, the nozzles 11a to 11j correspond to each of the zones 60a to 60j. This correspondence also holds between the lower spray 12 and the shape measuring instrument 60. Two or more nozzles may be assigned to one zone. In this case, the total number of nozzles of the upper spray 11 or the lower spray 12 is represented by k times the total number of zones (where k is an integer of 2 or more).

Returning to FIG. 1, the configuration of the system 100 will be described. 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 the set values of various equipments on the rolling line. Various types of equipment include hot rolling equipment, cold rolling equipment, foil rolling equipment and the like. The rolling mill 72 corresponds to a foil rolling facility.

The set values include various target values of the rolled material on the outlet side of various facilities. The various target values include target values for plate thickness and plate width. The target value on the outlet side of the foil rolling equipment includes the target value of tension for each of the zones 60a to 60j. Hereinafter, the target value of tension for each of the zones 60a to 60j is also 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 about the set value.

The shape control device 30 is a computer having at least a processor, a memory, and an input / output interface. The shape control device 30 includes a shape deviation calculation function 31, an operation amount calculation function 32, and an inversion 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. The calculation of the shape deviation SD is performed every predetermined control cycle. The information of the shape deviation SD is transmitted to the manipulated variable 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 manipulated variable calculation function 32 adjusts the manipulated variable of the nozzle corresponding to this zone according to the absolute value AV (= | SD-TH |) of the deviation between the two. And set. On the other hand, when the shape deviation SD of the zone shows a value larger than the threshold value TH, the manipulated variable calculation function 32 sets the manipulated variable of the nozzle corresponding to this zone to the minimum value. The "minimum value" is the amount of operation of the nozzle for reducing the injection flow rate of the coolant to the minimum flow rate (for example, zero or near zero flow rate).

As another example, when 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 value TH is negative, the shape deviation SD of this zone is larger than the threshold value TH. Therefore, in this case, the operation amount calculation function 32 sets the operation amount of the nozzle corresponding to this zone to the minimum value.

In the case of a nozzle that injects coolant by opening and closing the valve, the operation amount calculation function 32 switches the open / closed state of the valve based on the result of comparison between 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 manipulated variable 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 manipulated variable calculation function 32 sets the valve of the nozzle corresponding to this zone to the closed state.

As another example, when there is a zone in which the actual shape SA shows a larger value than the target shape ST, the sign of the shape deviation SD of the zone becomes positive. Since the sign of the threshold value TH is negative, the shape deviation SD of this zone is larger than the threshold value 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 operation amount of the nozzle to the spray control device 50 as the operation amount information. When the reversal determination information from the reversal determination function 33 is received, 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 operation amount corresponding to the absolute value AV is set, the operation amount calculation function 32 changes this operation amount to the minimum value. On the contrary, when the manipulated variable is set to the minimum value, the manipulated variable calculation function 32 changes 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 the operation amount information. When the reversal determination information from the reversal determination function 33 is received, 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 set state from the open state (ON) to the closed state (OFF). When the valve is set to the closed state, the operation amount calculation function 32 switches the set state from the closed state (OFF) to the open state (ON).

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

The spray control device 50 individually controls the coolant injection operation by 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 the shape control of the rolled material. Hereinafter, the shape control premised 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. As described in the description of the basic operation amount calculation function 32, in the shape control, the coolant injection operation by the nozzle is determined based on the result of comparison between the shape deviation SD and the threshold value TH. 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 minimum flow rate when the shape deviation SD shows a value larger than the threshold value TH. Hereinafter, it is also referred to as "basic operation".

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

The upper part of FIG. 3 shows the shape deviation SD before the execution of the shape control. In the upper part, the shape deviation SD of some 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 central portion of the rolled material shows 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 valve of the nozzle corresponding to the central zone is set to the closed state. As a result, the coolant is injected from the nozzles corresponding to the zones at both ends at a predetermined flow rate, and the coolant is injected from the nozzles corresponding to the zones at both ends at the minimum flow rate. The predetermined flow rate is preset as an injection flow rate of coolant that is larger than the minimum flow rate.

The lower part of FIG. 3 shows the shape deviation SD after executing the shape control. In this lower row, the shape deviation SDs at both ends are reduced, and some shape deviation SDs show 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 rolls corresponding to these zones are cooled by the coolant and thermal expansion is locally suppressed. I will be able to do it.

In the lower example of FIG. 3, the shape deviation SD at the central portion is reduced as well as the shape deviation SD at both ends. However, some shape deviation SDs show values less than zero. In addition, some shape deviation SDs show values smaller than the threshold value TH. The reason for this is that the injection of coolant from the nozzles corresponding to the central zones is performed at the minimum flow rate, so that the thermal expansion of the rolling roll zones corresponding to these zones is locally promoted.

1-2-2. First Problem of Basic Operation FIG. 4 is a diagram showing a second distribution example of the shape deviation SD before and after the execution of the 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 the shape control having the same contents as the shape control described in FIG. 3 is executed, the same distribution example as the distribution example 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 SDs at both ends do not decrease, but rather increase. The shape deviation SD at the center shows the same tendency as that at both ends. That is, an effect opposite to the flattening effect described in the lower part of FIG. 3 is brought about.

1-2-3. The second problem of the basic operation FIG. 5 is a diagram showing a third distribution example of the shape deviation SD before and after the execution of the 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 the shape control having the same contents as the shape control described in FIG. 3 is executed, the same distribution example as the distribution example 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 is reduced. That is, the flattening effect described in the lower part of FIG. 3 is obtained at the central portion, and the opposite effect is brought about at both ends.

1-3. Improvement points of shape control Therefore, in the shape control of the first embodiment, a reversing switch table that defines the relationship between the grade classification of the rolled material and the reversing operation is set. The reversing operation is a nozzle operation in which the coolant injection operation is reversed from the basic operation. The reversing switch table is created, for example, by separately performing rolling with different grade classifications and identifying the zone where the adverse effect is brought about. An inversion switch table may be created by specifying the zone where the flattening effect is obtained.

FIG. 6 is a diagram showing an example of an inverting switch table. As shown in FIG. 6, the reversing switch table 41 is a table in which reversing switches (ON or OFF) are defined for each grade classification (AA, BB, CC, DD, EE, ...). According to the inverting switch table 41, when the inverting switch indicates OFF, the basic operation is selected. When the inverting switch indicates ON, the inverting operation is selected. The 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 inverting switch table 41. The basic switch table is a table in which basic switches (ON or OFF) are specified for each grade 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, reverse operation is selected. The inverting 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 reversing nozzle table that defines the relationship between the plate width classification of the rolled material and the nozzle that performs the reversing operation is set. The reversing nozzle table is created by separately rolling a rolled material with a zone where the flattening effect cannot be obtained by shape control by changing the plate width classification, and identifying the zone where the flattening effect by shape control cannot be obtained. NS.

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

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

1-4. Specific Processing FIG. 8 is a flowchart illustrating a processing flow when the processor of the shape control device 30 performs the shape control of the first embodiment. The routine shown in FIG. 8 is repeatedly executed in 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 or not the inverting switch is ON (step S1). The process of step S1 is performed by referring to the reversing switch table 41 using the grade classification of the rolled material currently being rolled. A basic switch table may be used instead of the inverting switch table 41. 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 of interest in this routine is the target of the reversing operation (step S2). The process of step S2 is performed by referring to the reversing nozzle table 42 using the plate width classification of the rolled material currently being rolled. A basic nozzle table may be used instead of the reversing nozzle table 42. The information regarding the plate 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 or not the shape deviation SD is smaller than the threshold value TH (step S3). If the determination result in step S1 or S2 is negative, it means that the nozzle of interest in this routine is the target of the basic operation. Therefore, if the determination result in step S3 is affirmative, 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 the closed state (step S5).

If the determination result in step S2 is affirmative, it is determined whether or not the shape deviation SD is larger than the threshold value TH (step S6). If the determination result in step S2 is affirmative, it means that the nozzle of interest in this routine is the target of the reversing operation. If the determination result in step S6 is affirmative, 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 the closed state (step S8).

1-5. Effect According to the shape control of the first embodiment described above, the coolant injection operation is determined for each nozzle by referring to the reversing switch table 41 and the reversing nozzle table 42. Therefore, it is possible to individually control the injection operation not only when the flattening effect by the shape control is obtained but also when the adverse effect is brought about, so that the shape deviation SD in each zone approaches zero. Therefore, it is possible to improve the product quality of the rolled material.

2. Embodiment 2
Next, the second embodiment will be described with reference to FIGS. 9 to 11. The contents that overlap with the contents described in the first embodiment are omitted as appropriate.

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

The inversion learning function 34 performs an inversion learning process. The inversion learning process may be performed during the rolling of the rolled material 71, or may be performed during the preparation for rolling the rolled material 71. In the inversion learning process, the evaluation value ESD is calculated using the shape deviation SD received from the shape measuring instrument 60 during a predetermined learning period. As the learning period, a period in which the speed of the rolled material 71 is stable and the reversing switch is not switched is exemplified. In the inversion learning process, it is also determined whether or not to update the information in the inversion nozzle table 42 based on the evaluation value ESD. The nozzles targeted for the inversion learning process are all the nozzles of the coolant spray 10. Hereinafter, the inversion learning process will be described.

2-2. Inversion learning process FIG. 10 is a timing chart showing a first example of the inversion learning process. FIG. 11 is a timing chart showing a second example of the inversion learning process. The time period T1 to T10 shown in FIGS. 10 and 11 corresponds to the learning period under stationary conditions. As shown in FIGS. 10 and 11, the inverting switch of the inverting switch table 41 indicates ON during times T1 to T10.

In the examples shown in FIGS. 10 and 11, the reversing operation is selected for the nozzle to be the target of the reversing learning process. Then, in the example shown in FIG. 10, the valve is set to the open state during the time T1 to T6, and the valve is set to the closed state during the time T6 to T10. In the example shown in FIG. 11, the valve is set to the open state during the times T1 to T4, and the valve is set to the closed state during the times T4 to 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 (however, 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 valve setting state (+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 the times T1 to T6 when the valve is set to ON (open state). As the tension becomes smaller, the actual shape SA shows a value on the looser side. Therefore, the sign of the amount of change ΔSA between the times T1 to T6 shows a plus. Therefore, the evaluation value ESD, which is the sum of the values obtained by multiplying the change amount ΔSA by the coefficient (= + 1), increases during the times T1 to T6.

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

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

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

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

In the inversion learning process, the information in the inversion nozzle table 42 is updated based on the determination of whether or not the value of the evaluation value ESD in the learning period exceeds the permissible value AL. When the evaluation value ESD exceeds the permissible 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 the flattening effect due to the reversing operation can be obtained. Therefore, in this case, the information is not updated.

On the other hand, when the evaluation value ESD is less than the permissible 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 the flattening effect due to the reversing operation cannot be obtained. NS. Therefore, in this case, the information in the reversing nozzle table 42 is updated. Specifically, the information of the nozzle targeted for the reversal learning process is deleted from the reversal nozzle table 42.

In the examples shown in FIGS. 10 and 11, the information in the reversing switch table 41 was updated from the viewpoint of whether or not the flattening effect due to the reversing operation could be obtained. However, the information may be updated based on a viewpoint different from this viewpoint. For example, the information in the inverting switch table 41 may be updated from the viewpoint of whether or not the flattening effect of the basic operation can be obtained. If the evaluation value ESD is calculated and compared with the permissible value AL while the reversing switch is OFF, information on the nozzle to be the target of the reversing operation can be added to the reversing nozzle table 42.

When the inversion learning process is performed using the basic switch table, the information of the switch table may be updated from the viewpoint of whether or not the flattening effect of the basic operation can be obtained. For example, the evaluation value ESD is calculated and compared with the allowable value AL while the basic switch indicates ON. This makes it possible to delete the nozzle information that should be the target of the reversing operation from the basic nozzle table. The information in the basic switch table may be updated from the viewpoint of whether or not the flattening effect of the inversion operation can be obtained. For example, while the basic switch is OFF, the evaluation value ESD is calculated and compared with the allowable value AL. This makes it possible to add information on nozzles that should be the target of basic operation to the basic nozzle table.

2-3. Effect According to the second embodiment described above, the inversion learning process is performed. According to the inversion learning process, it is possible to periodically verify whether or not the flattening effect of the basic operation or the inversion operation can be obtained. Then, according to the verification result, the nozzles targeted for the reversal learning process can be added to or deleted from the reversing 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 and changes in rolling conditions.

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

Claims (2)

With rolling rolls
A measuring instrument provided on the exit side of the rolling roll and for each of a plurality of zones divided in the body length direction of the rolling roll, and measuring the actual shape of the rolled material for each of the plurality of zones.
A plurality of nozzles provided on the entry side of the rolling roll and in each of the plurality of zones to inject coolant toward the plurality of zones.
A control device that performs shape control that individually controls the coolant injection operation by the plurality of nozzles based on the deviation between the actual shape and the target shape.
With
The control device is used in the shape control.
Based on the grade classification and the plate width classification, the basic operation or the reversing operation is selected as the injection operation, and the injection operation is selected.
For the nozzle for which the basic operation is selected, when the deviation is smaller than the threshold value, the injection flow rate of the coolant from the nozzle is set to a predetermined flow rate, and when the deviation is larger than the threshold value, the flow rate is set. Set the coolant injection flow rate from the nozzle to the minimum flow rate,
For the nozzle for which the reversing operation is selected, when the deviation is larger than the threshold value, the injection flow rate of the coolant from the nozzle is set to the predetermined flow rate, and when the deviation is smaller than the threshold value. Is a shape control system for rolled materials, characterized in that the injection flow rate of coolant from the nozzle is set to the minimum flow rate. A storage device having a nozzle table showing the relationship between the nozzles targeted for the basic operation or the reversing operation and the plate width division is further provided.
The control device further performs a reversal learning process for updating information on a nozzle targeted for the basic operation or the reversing operation in the nozzle table based on the deviation in a predetermined learning period. Item 1. The shape control system for the rolled material according to Item 1.

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