JP6966417B2 - Rolling control device, rolling control method, and rolling control program - Google Patents

Description

The present invention relates to a rolling control device, a rolling control method, and a rolling control program.

As a rolling mill for rolling a material to be rolled into a metal plate, for example, a tension reel for feeding or winding the material to be rolled is used, and the rolled material to be rolled is passed between a pair of rolls to roll the material to be rolled. ing.

In such a rolling mill, for example, plate thickness control for controlling the spacing between roll pairs and tension control for adjusting the tension applied to the material to be rolled and the speed at which the material to be rolled is sent out from the tension reel are used, and these are appropriately combined. Therefore, it is adjusted so that a stable plate thickness can be obtained (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-113629

However, the plate thickness of the rolled material to be rolled varies depending on factors over time such as the temperature of the roll and the friction between the roll and the material to be rolled. When rolling on an ultra-thin plate material such as metal foil, the above-mentioned plate thickness control and tension control cannot keep up with the sudden change in plate thickness in a transient state such as at the start of rolling, and the material to be rolled breaks. There is a risk of problems such as.

The present invention has been made based on the above circumstances, and an object thereof is to suppress fluctuations in the thickness of the rolled material to be rolled even when foil rolling is performed. It is an object of the present invention to provide a rolling control device, a rolling control method, and a rolling control program capable of improving the thickness accuracy.

The invention made to solve the above problems is
A rolling control device that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. Tension control means that controls the torque of the tension reel to a constant value,
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling machine. Speed tension control means to control the speed of
The distance between the rolls in the roll pair is controlled based on the tension of the material to be rolled inserted into the rolling machine, and the material to be rolled is sent out from the tension reel based on the plate thickness of the rolled material that has been rolled. Speed plate thickness control means to control the speed of
Control mode selection means for selecting one of control modes based on the rolled state of the material to be rolled, control by the tension control means, control by the speed tension control means, and control by the speed plate thickness control means. When,
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. It is a rolling control device, characterized in that it is provided with a roll speed selection control means.

In addition, another invention made to solve the above problems is
A rolling control device that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. Tension control means that controls the torque of the tension reel to a constant value,
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. It is a rolling control device, characterized in that it is provided with a roll speed selection control means.

In addition, another invention made to solve the above problems is
A rolling control device that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling machine. Speed tension control means to control the speed of
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. It is a rolling control device, characterized in that it is provided with a roll speed selection control means.

In addition, another invention made to solve the above problems is
A rolling control device that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
The distance between the rolls in the roll pair is controlled based on the tension of the material to be rolled inserted into the rolling machine, and the material to be rolled is sent out from the tension reel based on the plate thickness of the rolled material that has been rolled. Speed plate thickness control means to control the speed of
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. It is a rolling control device, characterized in that it is provided with a roll speed selection control means.

In addition, another invention made to solve the above problems is
It is a rolling control method that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
A tension that controls the distance between the rolls in the roll pair based on the thickness of the rolled material to be rolled and sends the material to be rolled to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. A control mode that controls the reel torque to a constant value,
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling mill. The tension reel controls the distance between the rolls in the roll pair based on the control mode for controlling the speed and the tension of the material to be rolled inserted into the rolling mill, and is based on the plate thickness of the material to be rolled. From the control modes for controlling the speed of the material to be rolled, one of the control modes is selected based on the rolling state of the material to be rolled, and the step of executing the selected control mode.
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. It is a rolling control method characterized by having a step to perform.

In addition, another invention made to solve the above problems is
A rolling control program that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
A tension that controls the distance between the rolls in the roll pair based on the thickness of the rolled material to be rolled and sends the material to be rolled to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. A control mode that controls the reel torque to a constant value,
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling mill. The tension reel controls the distance between the rolls in the roll pair based on the control mode for controlling the speed and the tension of the material to be rolled inserted into the rolling mill, and is based on the plate thickness of the material to be rolled. From the control modes for controlling the speed of the material to be rolled, one of the control modes is selected based on the rolling state of the material to be rolled, and the step of executing the selected control mode.
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. It is a rolling control program characterized by having a step to perform.

The present invention provides a rolling control device, a rolling control method, and a rolling control method capable of suppressing fluctuations in the plate thickness of the rolled material to be rolled and improving the accuracy of the output plate thickness even when foil rolling is performed. A rolling control program can be provided.

It is a schematic block diagram which shows the 1st Embodiment of this invention. It is a schematic diagram for demonstrating the behavior of a roll pair at the time of foil rolling. It is a schematic diagram which shows the change of the output side plate thickness deviation at the start of foil rolling. It is a schematic diagram which shows the change of the output side plate thickness deviation in the plate thickness control at the start of foil rolling. It is a schematic diagram which shows the processing in the entry side TR speed command part. It is a schematic diagram which shows the process in the entry side TR control unit. It is a schematic diagram which shows the processing in a plate thickness control part and a tension control part. It is a schematic block diagram of a control method selection part. It is a schematic diagram which shows the selection example of the control mode by a control mode selection part. It is a schematic diagram which shows the selection example of the control mode by a control mode selection part. It is a schematic diagram which shows the other selection example of the control mode by a control mode selection part. It is a schematic diagram which shows the processing in a mill speed plate thickness control part, (a) is the processing of a mill speed setting part, (b) is the processing of a mill speed plate thickness control part, (c) is a mill speed plate thickness control part. An example of control by is shown. It is a schematic diagram which shows the process in a control output selection part. It is a schematic diagram explaining an example (at the beginning of a process) of a rolling method. It is a schematic diagram explaining an example (the whole process) of a rolling method. It is a schematic diagram which shows the data structure of the database which stores the optimal control mode. It is a schematic diagram which shows an example of the hardware structure which performs the control which concerns on embodiment of this invention. It is a schematic block diagram which shows the 2nd Embodiment of this invention. It is a schematic block diagram of the control method selection part in 2nd Embodiment. It is a schematic block diagram which shows the 3rd Embodiment of this invention. It is a schematic block diagram of the control method selection part in 3rd Embodiment. It is a schematic block diagram which shows the 4th Embodiment of this invention. It is a schematic block diagram of the control method selection part in 4th Embodiment.

As shown in FIG. 1, the rolling apparatus generally includes a rolling mill 1, an inlet tension reel 2 (hereinafter, also referred to as “entrance TR2”), and an outlet tension reel 3 (hereinafter, “exit side TR3”). ”) And a rolling control device. The rolling control device will be described in detail in the section of each embodiment.

In the present specification, the "entry side" means the side where the material m to be rolled is sent toward the rolling mill 1 (upstream side of the rolling mill 1), and the "outside" means the material m to be rolled. It means the side sent out from the rolling mill 1 (downstream side of the rolling mill 1). Further, the "deviation" means the difference between the set value or the predicted value and the actually measured value (actual value).

The rolling mill 1 has a roll-to-R composed of an upper work roll R1 (hereinafter, also simply referred to as “roll R1”) and a lower work roll R2 (hereinafter, also simply referred to as “roll R2”), and has rolling control. The interval between rolls (upper work roll R1 and lower work roll R2) in a roll pair that receives signals from the roll gap control unit 21 and mill speed control unit 31, which will be described later in the apparatus, and rotates at a predetermined peripheral speed (hereinafter,). By adjusting the "roll gap"), the material m to be rolled passing between the rolls is rolled.

The entry-side TR2 and the exit-side TR3 receive signals from the entry-side TR control unit 42 and the exit-side TR control unit 52, which will be described later, in the rolling control device, respectively, and the electric motors provided on the entry-side TR2 and the exit-side TR3 (non-existence side TR3). The material m to be rolled is sent out to the rolling mill 1 on the inlet side TR2, and the material m to be rolled rolled by the rolling mill 1 is wound up on the outlet side TR3 using (shown in the figure).

Here, the rolling phenomenon related to the variation in the plate thickness of the material m to be rolled in the rolling mill 1 using the roll vs. R will be described. Since the plate thickness of the rolled material m is important for product quality, plate thickness control is performed. In this control, the actual value of the plate thickness of the material m to be rolled detected by the output side plate thickness meter a2 is used, and for example, the roll gap control unit 21 operates the roll gap between the upper and lower work rolls R1 and R2. As a result, the plate thickness of the material m to be rolled on the output side is adjusted.

In reality, the plate thickness of the material m to be rolled on the exit side is the thermal expansion of the rolls R1 and R2, the fluctuation of the friction coefficient between the rolls R1 and R2 and the material m to be rolled, and the deformation of the material m to be rolled. It changes due to elastic deformation of rolls R1 and R2 caused by resistance and the like.

First, changes in plate thickness due to thermal expansion of rolls R1 and R2 will be described. FIG. 2 is a schematic diagram for explaining the behavior of roll vs. R during rolling (hereinafter, also referred to as “foil rolling”) to a thin plate thickness such as a metal foil. As shown in FIG. 2A, the material m to be rolled is rolled by rolling down the material m to be rolled by the vertical work rolls R1 and R2. Since the rolling load required for rolling is applied to both ends of the rolls R1 and R2 (see the arrow in FIG. 2), the rolls R1 and R2 are in a bent state due to the rolling load. At this time, in a rolled state where the plate thickness of the material m to be rolled is thick, as shown in FIG. 2B, the plate width of the material m to be rolled is even when the rolls R1 and R2 are in a bent state. Since the roll gap is open in the entire direction, it is possible to change the rolling force applied to the material m to be rolled by changing this roll gap, thereby changing the rolling state and the output plate of the rolling mill 1. The thickness can be controlled.

On the other hand, during foil rolling of the material m to be rolled, as shown in FIG. 2C, both ends of the upper and lower work rolls R1 and R2 are in contact with each other, and a sufficient rolling force is applied to the material m to be rolled. It will not be possible. Therefore, is it possible to shift the material m to be rolled from an elastic deformation state (a state in which the entry-side plate thickness and the exit-side plate thickness are the same) to a plastic deformation state (a state in which the exit-side plate thickness is smaller than the entry-side plate thickness)? Alternatively, a state may occur in which the set output side plate thickness cannot be obtained even if the state shifts to the plastic deformation state. In such a state, even if the roll gap control unit 21 of the rolling mill 1 tries to change the roll gap, the rolling force applied to the material m to be rolled is changed because both ends of the upper and lower work rolls R1 and R2 are in contact with each other. I can't.

However, the vertical work rolls R1 and R2 rotate at the rolling speed output from the mill speed control unit 31, which will be described later, and the vertical work rolls R1 and R2 come into contact with each other due to heat generated by the contact between the vertical work rolls R1 and R2 and the material m to be rolled. The temperature of the rolls R1 and R2 in the region L rises. Therefore, the upper and lower working rolls R1 and R2 are thermally expanded in the contact region L and its vicinity, and the roll radius R1d1 is increased. At this time, as shown in FIG. 2D, by increasing the roll radius R1d2, the contact state between both ends of the rolls R1 and R2 is eliminated and the roll gap is opened, and the rolling force is applied to the material m to be rolled. You will be ready to call.

Next, the plate thickness change due to the elastic deformation of the rolls R1 and R2 will be described. Since the rolls R1 and R2 of the rolling mill 1 are elastic bodies made of metal, the working rolls R1 and R2 are elastically deformed during rolling. For example, in the case of a 4-stage rolling mill, the backup roll and the working roll are deformed, and in the case of the 6-stage rolling mill, the backup roll, the intermediate roll and the working roll (all not shown) are deformed. The elastic deformation of the working rolls R1 and R2 in contact with the material m to be rolled is important. That is, as the roll gap is closed, the working rolls R1 and R2 are in a bent state, and the area of the contact region L between the material m to be rolled and the working rolls R1 and R2 increases. Therefore, the load per unit area applied to the material to be rolled reaches a plateau, and when the load does not increase, the material m to be rolled is not plastically deformed. This means that there is a minimum rollable plate thickness due in part to the deflection of the working rolls R1 and R2. Such bending of the working rolls R1 and R2 has a small elastic modulus of the rolls R1 and R2, a large deformation resistance (rolling load required for plastic deformation) of the material m to be rolled, and the material m to be rolled and the rolls R1 and R2. The larger the friction coefficient between and, the larger.

Here, the above-mentioned minimum rollable plate thickness can be expressed by the following approximate formula.
hmin∝ [R × μ × (k−σ)] / E ・ ・ ・ (1)
In the above formula (1), hmin is the minimum plate thickness that can be rolled, E is the elastic modulus (Young's modulus) of the roll, R is the working roll diameter, μ is the coefficient of friction, k is the deformation resistance, and σ is the tension on the entry / exit side. The average value is shown respectively.

In the above formula (1), the elastic modulus E of the roll and the working roll diameter R depend on the configuration of the rolling mill, and the deformation resistance k depends on the configuration of the material to be rolled. The coefficient of friction μ is due to the friction generated between the material to be rolled and the roll, and is determined by the lubricating oil injected between the material to be rolled and the work roll, the surface roughness of the work roll, the rolling speed, and the like. Dependent. Of these, the rolling speed dependence of the friction coefficient μ is generally small when the rolling speed is high and large when the rolling speed is slow. For this reason, in general, the larger the rolling speed, the smaller the minimum plate thickness that can be rolled. It becomes a state. Further, as shown in the above formula (1), the minimum plate thickness that can be rolled can be reduced by increasing the tension on the inlet side and the outlet side of the rolling mill.

Here, the deviation in the thickness of the exposed side plate of the material m to be rolled at the start of foil rolling will be described with reference to FIG. When the material m to be rolled is thinly rolled, if the roll gap is constant, the rolling is in an elastic deformation state when the rolling speed is low, and the rolling is in a plastic deformation state when the rolling speed exceeds a certain value due to the acceleration of the rolling mill. Move to.

When shifting to the plastic deformation state, even if the roll gap is constant, the output side plate thickness becomes thinner as the rolling speed increases. Therefore, for example, elastic deformation is attempted to control the plate thickness only by the actual value of the output side plate thickness. If the roll gap is closed during the state, the plate thickness may become too thin (undershoot) after the transition to plastic deformation, as shown in FIG. When such an undershoot occurs, it takes time to converge to an appropriate plate thickness, and the off-gauge length (total length of the material to be rolled whose plate thickness is out of specification or unstable) tends to be long.

As described above, in foil rolling, the material m to be rolled changes from the elastically deformed state to the plastically deformed state by rolling, and even in the plastically deformed state, the output side plate thickness is more likely to change than in thick-walled rolling. Become.

Hereinafter, the rolling control device, the rolling control method, and the rolling control program of the present invention will be described with reference to the drawings based on the rolling phenomenon at the time of foil rolling described above. Not limited to only. In each embodiment, a single stand rolling mill, which is a typical rolling mill using tension reels (entry side TR2 and exit side TR3), will be exemplified.

[First Embodiment]
(Rolling control device)
The rolling control device is a rolling control device that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. Tension control means that controls the torque of the tension reel to a constant value (this control method is also referred to as "control method (A)" below), and
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling mill. (This control method is also referred to as "control method (B)" below) and a speed tension control means for controlling the speed of.
The distance between the rolls in the roll pair is controlled based on the tension of the material to be rolled inserted into the rolling mill, and the material to be rolled is sent out from the tension reel based on the plate thickness of the rolled material that has been rolled. (This control method is also referred to as "control method (C)" below) and a speed plate thickness control means for controlling the speed of.
Control mode selection means for selecting one of control modes based on the rolling state of the material to be rolled, control by the tension control means, control by the velocity tension control means, and control by the velocity plate thickness control means. When,
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. (This control method is also referred to as "control method (D)" below), and the roll speed selection control means is provided.

The rolling control device 11 is a rolling control device that controls the rolling mill 1 that rolls the material m to be rolled by roll vs. R, and is a tension control means, a speed tension control means, a speed plate thickness control means, and a control mode described above. In order to execute the control methods (A) to (D) performed by the selection means and the roll speed selection control means, specifically, for example, as shown in FIG. 1, the roll gap control unit 21 and the mill speed control unit 31, the entry side TR speed command unit 41, the entry side tension setting unit 43, the exit side tension setting unit 53, the entry side tension current conversion unit 44, the exit side tension current conversion unit 54, and the entry side TR control. Section 42, exit side TR control section 52, entry side tension control section 46, exit side tension control section 56, reduction plate thickness control section 61, speed plate thickness control section 62, speed tension control section 63. , The reduction tension control unit 64, the mill speed plate thickness control unit 65, the mill speed setting unit 81, the control method selection unit 71 (control mode selection unit 711, speed correction selection unit 712, and control output selection unit 713). Can be configured by. The rolling control device 11 is not limited to these specific configurations.

The roll gap control unit 21 controls the roll gap between the upper / lower work rolls R1 and R2.

The mill speed control unit 31 controls the speed of the rolling mill 1 (peripheral speed of the upper / lower work rolls R1 and R2). During rolling, the mill speed control unit 31 receives a speed command output from the mill speed setting unit 81 to keep the speed of the rolling mill 1 (peripheral speed of the upper / lower work rolls R1 and R2) constant. Control is carried out.

As shown in FIG. 5, the entry-side TR speed command unit 41 is _{a reference speed setting unit using the mill speed VMILL} determined by the mill speed setting unit 81 by the operator's manual operation and the rolling mill entry-side reverse rate b. Using the entry-side TR speed V _ETR created by 82 and the entry-side TR speed change amount ΔV from the control method selection unit 71, an entry-side TR speed command V _ETRref is created and used as the entry-side TR control unit. Output to 42.

The incoming TR control unit 42 has an operation mode (constant torque control mode) in which constant torque control (constant current control) is performed in response to a current command, and an operation mode (constant speed control in TR) in which constant speed control is performed in response to a speed command. Mode), the entry-side TR speed command V _{ETRref from the entry-side TR speed command unit 41, the current command I ETRset} from the entry-side tension current conversion unit 44, and the command from the control method selection unit 71. Correspondingly, the current is output to the input side TR2 by switching between the constant torque control mode and the constant TR speed control mode. Here, the entry-side TR2 is composed of a tension reel and an electric motor (not shown) for moving the tension reel, and the current output to the entry-side TR2 means a current to the motor.

As shown in FIG. 6, the entry-side TR control unit 42 specifically creates a _{current command I ETRref} to the motor so that the _{speed command V ETRref} and the speed actual V _{ETRfb match. It is composed of} an I control 422 and a current control 423 that controls the _{created current command I ETRref and the current I ETRfb} flowing through the motor of the input side TR2 so as to match.

For example, when the constant torque control mode is selected, the input side TR control unit 42 replaces _{the I control 422 with the input side TR current set value I ETRset from the input side tension current conversion unit 44.} On the other hand, when the constant TR speed control mode is selected (when the constant torque control mode is not selected), the incoming TR control unit 42 changes the P control 421 and the I control 422 according to the incoming TR speed deviation. When the constant torque control mode is selected in this state _{, the current correction 424 corrects the input} side TR current command I TERref so that it does not change discontinuously.

By configuring the entry-side TR control unit 42 in this way, the control mode of the entry-side TR control unit 42 can be freely changed from constant torque control to speed control, or from speed control to constant torque control even during rolling operation. It can be switched, and the control method (A), the control method (B), and the control method (C) can be freely switched.

The entry-side tension setting unit 43 and the exit-side tension setting unit 53 calculate the entry-side and exit-side tension setting values, respectively.

The input side tension current conversion unit 44 and the output side tension current conversion unit 54 receive signals from the input side tension setting unit 43 and the output side tension setting unit 53, respectively, and receive a TR (tension reel) mechanical system and a TR (tension reel). ) Based on the model of the control unit, the current value for obtaining the torque of the motor so that the material m to be rolled on the entry side and the exit side becomes the tension set value is obtained.

The input-side TR control unit 42 and the exit-side TR control unit 52 receive signals from the input-side tension current conversion unit 44 and the exit-side tension-current conversion unit 54, respectively, and control the current of the motor so as to have the above current value. do.

The entry-side tension control unit 46 and the exit-side tension control unit 56 use the actual values of tension measured by the entry-side tension meter b1 and the exit-side tension meter b2 installed on the entry side and the exit side of the rolling mill 1, respectively. To correct the error of the control model. The entry-side tension control unit 46 and the exit-side tension control unit 56 assign correction values to the entry-side tension current conversion unit 44 and the exit-side tension-current conversion unit 54, respectively, whereby the entry-side TR control unit 42 and the exit-side side TR control unit 42 and the exit side. The current value set in the TR control unit 52 is corrected.

Here, the tension control means, the speed tension control means, the speed plate thickness control means, the control mode selection means, and the roll speed selection control means described above will be described in detail.

The above-mentioned tension control means controls the distance between the rolls in the roll pair based on the plate thickness of the rolled material to be rolled, and transfers the material to be rolled to the rolling mill based on the tension of the material to be rolled inserted into the rolling mill. The torque of the tension reel to be sent out is controlled to a constant value (control method (A)). Specifically, the execution of the control method (A) by the tension control means uses, for example, the output from the reduction plate thickness control unit 61, or the tension measured by the inlet tension meter b1 or the outlet tension meter b2. This can be done by correcting the current command to the motor using the actual value (for example, correcting to keep the current to the motor constant) and controlling the tension applied to the material to be rolled m to be constant.

The speed tension control means described above controls the distance between the rolls in the roll pair based on the plate thickness of the rolled material to be rolled, and is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling mill. The speed of the rolled material is controlled (control method (B)). Specifically, the execution of the control method (B) by the velocity tension control means can be performed by using, for example, the output from the reduction plate thickness control unit 61 and the output from the velocity tension control unit 63.

The speed plate thickness control means described above controls the distance between the rolls in the roll pair based on the tension of the material to be rolled inserted into the rolling mill, and is sent out from the tension reel based on the plate thickness of the rolled material to be rolled. The speed of the material to be rolled is controlled (control method (C)). Specifically, the execution of the control method (C) by the speed plate thickness control means can be executed by using, for example, the output from the speed plate thickness control unit 62 and the output from the reduction tension control unit 64. ..

Here, the reduction plate thickness control unit 61, the speed plate thickness control unit 62, the velocity tension control unit 63, and the reduction tension control unit 64 will be described.

As shown in FIG. 7, the reduction plate thickness control unit 61 obtains the _output side plate thickness deviation Δh, which is the difference between the actual output side plate thickness h fb measured by the output side plate thickness meter a2 and the output side plate thickness set value h _ref. Integrate the product of the adjustment gain and the conversion gain from the output side plate thickness deviation Δh to the roll gap (I control), and the difference between this integrated value and the previous integrated value. △△ S _AGC is output. In FIG. 7, M indicates the mill constant of the rolling mill, and Q indicates the plastic constant of the material to be rolled.

The speed plate thickness control unit 62 uses the above-mentioned exit side plate thickness deviation Δh, and multiplies this outlet side plate thickness deviation Δh by the adjustment gain and the conversion gain from the exit side plate thickness deviation Δh to the entry side speed. Integrate (I control), and output _{the difference Δ (ΔV / V) AGC} between this integrated value and the previous integrated value.

The velocity tension control unit 63 uses the entry-side tension deviation _{ΔT b} , which is the difference between the entry-side tension actual value T bfbb measured by the entry-side tension meter 8 and the _entry- side tension set value T _{bref, and the entry-side tension deviation.} △ T _b in integrating those multiplied by the conversion gain of the entry-side speed of adjustment gain and the entry side tension deviation △ T _b (I control), the difference between the integrated value of the integrated value and the previous △ (△ V / V) Output _ATR.

Rolling tension control unit 64, which uses the entry side tension deviation △ T _b described above, multiplied by the conversion gain of the roll gap from the adjustment gain and the entry side tension deviation △ T _b on the entry side tension deviation △ T _b Is integrated (I control), and the difference △△ S _ATR between this integrated value and the previous integrated value is output.

As the integration method in each of the above-mentioned reduction plate thickness control unit 61, speed plate thickness control unit 62, velocity tension control unit 63, and reduction tension control unit 64, in addition to integration (I control), proportional integration (PI control) ), Different methods such as differential proportional integration (PID control) may be adopted.

The control mode selection means described above is controlled by the tension control means (control method (A)), control by the velocity tension control means (control method (B)), and the speed plate based on the plate thickness of the rolled material to be rolled. One of the control modes (control method (C)) controlled by the thickness control means is selected. As a method for selecting this control mode, for example, a method based on a change in the thickness of the protruding side plate when a step-like change (disturbance) is applied to the roll gap can be adopted. The control by the control mode selection means can be executed, for example, by the control mode selection unit 711 of the control method selection unit 71 shown in FIG.

The control mode selection unit 711 selects which of the control method (A), the control method (B), and the control method (C) is to be executed based on the plate thickness of the rolled material m to be rolled. do.

Here, the selection of the control mode in the control mode selection unit 711 is the tension of the material m to be rolled inserted into the rolling mill 1 when the distance between the rolls is changed stepwise during rolling of the material m to be rolled. It is preferably performed based on the fluctuation and the fluctuation of the plate thickness of the rolled material m.

9 and 10 are schematic views showing an example of selection of a control mode by the control mode selection unit 711. As shown in FIG. 9, the control mode selection unit 711 _{measures, for example, the fluctuation amount dT b} of the entry side tension, the fluctuation time T _bT, and the fluctuation amount dh of the exit side plate thickness immediately after applying the disturbance to the roll gap. At this time, the optimum control method among the control methods (A) to (C) is considered to change depending on the steel type of the material to be rolled, the thickness of the output side plate and the rolling speed. Therefore, for example, the rolling speed is set to low speed or medium speed. , High speed is divided into 3 stages, and disturbance (step change S1 to S3) is applied to the roll gap in each stage to measure the fluctuation amount dT _b of the entry side tension, the fluctuation time T _bT, and the fluctuation amount dh of the exit side plate thickness. do.

Next, in the control mode selection unit 711, as shown in FIG. 10, the _{value calculated by (dh / h ref} ) / (dT _b / Tb _ref ) is a predetermined threshold value (control method (C) selection value). If the following, the control method (C) is selected, if T _bT is equal to or higher than a predetermined threshold value (control method (B) selection value), the control method (B) is selected, and if other than the above, the control method is selected. Select (A). The control method (C) selection value and the control method (B) selection value can be obtained and set in advance by a past actual value, a simulation of the rolling mill 1, or the like. Further, in FIGS. 9 and 10, in the rolling speed divided into three stages, the optimum control method is the control method (A) for the low speed, the control method (B) for the medium speed, and the control method (C) for the high speed. The one selected as is illustrated.

As described above, in the rolling control device 11, the control mode selection means (control mode selection unit 711) selects the control mode based on the fluctuation of the tension of the material m to be rolled and the fluctuation of the plate thickness, so that the optimum control is performed. The mode can be smoothly selected, and rolling with a stable plate thickness can be performed.

The method for determining the control method by the control mode selection unit 711 described above is an example. For example, as shown in FIGS. 11A to 11D, an influence coefficient is obtained from the rolling results using a rolling phenomenon model. The optimum control method may be selected based on the magnitude relation of the obtained influence coefficient. Further, this measurement can be performed even during the production of the product by applying the above-mentioned disturbance within a range that does not affect the product quality of the material m to be rolled. _{Further, since the tension control that keeps} the torque of the tension reel constant is used when measuring the fluctuation time T bT, the control method (A) is selected in advance when the roll gap is changed in steps.

The roll speed selection control means described above controls the peripheral speed of a roll in a roll pair based on the plate thickness of the rolled material to be rolled (control method (D)). Specifically, the execution of the control method (D) by the roll speed selection control means can be executed by using, for example, the output from the mill speed plate thickness control unit 65.

As shown in FIG. 12B, the mill speed plate thickness control unit 65 uses the output side plate thickness deviation obtained from the plate thickness measured by the output side plate thickness meter a2, and the deviation small determination value from this output side plate thickness deviation. the subtracted, the exit side thickness deviation by multiplying conversion gain and integral gain in terms of giving the offset process, the mill speed change command by extracting only a limiting process acceleration direction △ V _AGCMref mill speed setting unit Output to 81. When the operator holds the mill speed in the speed command creation unit 811, the integrated gain _KIMILL is given, and when the mill speed is accelerated or decelerated, the holding command is turned off and the holding command is turned off for integration. The output is stopped with the gain K _{IMILL = 0.} Further, when the mill speed is low at the start of rolling and the plastic working state is already in place, the plate thickness control (control method (D)) by the mill speed plate thickness control unit 65 becomes unnecessary.

Here, an example of control by the mill speed plate thickness control unit 65 is shown in FIG. 12 (c). For example, if the exit side plate thickness deviation is larger than the large deviation determination value, the mill speed is increased, and if the exit side plate thickness deviation is smaller than the large deviation determination value, the roll gap control unit 21 operates the reduction or the entry side TR2. Operate the plate thickness control and continue the plate thickness control while reducing the amount of change in the mill speed. On the other hand, when the deviation of the plate thickness on the protruding side becomes smaller than the small deviation judgment value, the operation of the mill speed is stopped. When the deviation of the plate thickness on the exit side is smaller than the small deviation determination value in this way, it is effective to control the plate thickness by rolling down or operating the entry side TR2 by the roll gap control unit 21, so that the mill is assumed to be in the plastic working state. Although the speed operation is continued to be stopped, if the deviation of the plate thickness on the exit side becomes larger than the small deviation judgment value, the effect of the plate thickness control by the roll gap control unit 21 for reducing or operating the TR2 on the input side is reduced, so that rolling is possible. It is judged that the plate thickness is not sufficient, and the mill speed is increased until the deviation of the plate thickness on the protruding side becomes smaller than the small deviation judgment value.

As shown in FIG. 12A, the mill speed setting unit 81 uses the mill speed command value MRH _ref created by the operator of the rolling mill 1 in the speed command creation unit 811, and the mill speed command does not become a polygonal line. As described above, in the S-Curve circuit, the speed command deviation ΔV _{ref , which is the difference between the mill speed command value MRH ref} and the measured value _VMILLref of the mill speed, is calculated, and the mill speed is integrated by time integration. The command V _MILLref is calculated. _{Further, when the speed command creation unit 811 issues} a mill speed holding command, the rolling speed setting unit 81 sets _{the input value of MRH ref-} V MILLref to the S-Curve circuit to 0 at that time. Maintain mill speed.

Specifically, when the operator tries to accelerate / decelerate the mill speed and the speed command creation unit 811 outputs an acceleration / deceleration command, the mill speed setting unit 81 outputs acceleration / deceleration according to the command, and the operator outputs the acceleration / deceleration according to the command. When the speed command creating unit 811 outputs a holding command in an attempt to hold the speed, the speed correction selection unit 712 (control method selection unit 71) permits the execution of the control method (D), and the output value of the S-Curve circuit. The mill speed command _VMILLref can be changed by adding to and integrating.

Further, the roll speed selection control means selects whether or not to execute this control method (D) in addition to the control by the control method (D). The selection of whether or not to perform the control method (D) by the roll speed selection control means can be executed, for example, by the speed correction selection unit 712 of the control method selection unit 71 shown in FIG.

The speed correction selection unit 712 controls the mill speed plate thickness (control method (control method (control method)) based on the rolling state of the rolled material m (for example, whether the rolled material m is in an elastic deformation state or a plastic deformation state). D) Select whether or not to perform). Specifically, the speed correction selection unit 712 has the exit side plate thickness measured by the exit side plate thickness gauge a2 and the entry side plate thickness measured by the entry side plate thickness gauge a1 (rolled last time if there is no entry side plate thickness gauge). It is judged whether it is in the elastic deformation state or the plastic deformation state by comparing with the measured value of the entry side plate thickness at the time, etc., and if it is in the elastic deformation state, the material to be rolled m is stably rolled into the plastic deformation state. A command for executing the control method (D) is output. If the plate passing speed (the speed at which the material to be rolled passes through the rolling mill before the start of rolling) is already in a plastic deformation state, control by the control method (D) is unnecessary (the material to be rolled is in a stable plastic deformation state). Therefore, the speed correction selection unit 712 may allow only the plate thickness control and turn off the command for executing the control method (D).

If the plate thickness control is selected and this plate thickness control is started during manual acceleration by the operator, the output side plate thickness deviation will undershoot as described above. Therefore, the speed correction selection unit 712 may output the speed correction output side plate thickness correction value Δhcmp for the purpose of preventing the undershoot. Specifically, the speed correction selection unit 712 corrects the output side plate thickness deviation Δh obtained by using the output side plate thickness meter a2 by the speed correction output side plate thickness correction value Δhcmp, and as shown in FIG. At the time when the mill speed reaches the predicted speed at which the plastic deformation starts, the output side plate thickness deviation is locked on, and a correction value such that Δhcmp = 0 is output. As a result, if the plate thickness on the exit side does not become thin even at the predicted speed of plastic deformation start, the plate thickness control promotes the transition to the plastic deformation state by closing the roll gap, and the speed is corrected after the transition to the plastic deformation state. By controlling the output side plate thickness deviation so as to follow the output side plate thickness correction value Δhcmp, it is possible to prevent an over-control state. The above-mentioned plastic deformation start prediction speed may be set in advance from past experience, and the above setting may be corrected in a timely manner according to the actual results at the time of rolling.

The control of the control methods (A) to (C) selected by the control mode selection means described above and the control method (D) selected by the roll speed selection control means is the control output of the control method selection unit 71 shown in FIG. This is done via the selection unit 713. As shown in FIG. 13, the control output selection unit 713 is from the reduction plate thickness control unit 61, the speed plate thickness control unit 62, the speed tension control unit 63, the reduction tension control unit 64, and the mill speed plate thickness control unit 65. Output, selection result of control mode from control mode selection unit 711, selection result of control method (D) from speed correction selection unit 712, output permission signal of plate thickness control are input, roll gap control unit 21, entry side. A control command is output to the TR speed command unit 41, the incoming TR control unit 42, and the mill speed setting unit 81. The processing by the control output selection unit 713 is shown below.

When the control mode selection unit 711 selects the control method (A), the control output selection unit 713 controls the gap between the rolls in the roll to R based on the plate thickness of the rolled material m, so that the rolling plate is pressed. The output from the thickness control unit 61 is integrated by the integration processing unit 713a and output to the roll gap control unit 21. Further, the control output selection unit 713 controls the torque of the tension reel that sends the material m to be rolled to the rolling mill 1 to a constant value based on the tension of the material m to be rolled inserted into the rolling mill 1, so that the torque constant control mode Is output to the incoming TR control unit 42.

When the control mode selection unit 711 selects the control method (B), the control output selection unit 713 controls the gap between the rolls in the roll to R based on the plate thickness of the rolled material m, so that the rolling plate is pressed. The output from the thickness control unit 61 is integrated by the integration processing unit 713a and output to the roll gap control unit 21. Further, the control output selection unit 713 integrates the output from the speed tension control unit 63 in order to control the speed of the material m to be rolled sent out from the tension reel based on the tension of the material m to be rolled inserted into the rolling mill 1. The processing unit 713b performs integral processing and outputs this to the input side TR speed command unit 41.

When the control mode selection unit 711 selects the control method (C), the control output selection unit 713 controls the speed of the rolled material m sent out from the tension reel based on the plate thickness of the rolled material m. The output from the speed plate thickness control unit 62 is integrated by the integration processing unit 713b and output to the input TR speed command unit 41. Further, the control output selection unit 713 controls the interval between the rolls in the roll-to-R based on the tension of the material m to be rolled inserted in the rolling mill 1, so that the output from the rolling tension control unit 64 is integrated with the output from the rolling tension control unit 64a. Is integrated and output to the roll gap control unit 21.

When the speed correction selection unit 712 selects the control method (D), the control output selection unit 713 outputs the output from the mill speed plate thickness control unit 65 to the mill speed setting unit 81 in order to control the peripheral speed of the roll. do. Further, the control output selection unit 713 determines whether or not each plate thickness control and tension control can be output (whether or not the input can be input to the integration term) according to the permission signal of the plate thickness control output from the speed correction selection unit 712.

Since the control output selection unit 713 has the above configuration, the control methods (A) to (C) can be switched between each other according to, for example, the rolling speed even during the rolling operation, and the mill speed plate thickness control can be performed. (Control method (D)) can be implemented.

(Rolling control method)
The rolling control method controls a rolling mill that rolls a material to be rolled with a pair of rolls, and controls the distance between rolls in the pair of rolls based on the thickness of the rolled material to be rolled. Based on the control mode that controls the torque of the tension reel that sends the rolled material to the rolling machine to a constant value based on the tension of the rolled material inserted into the rolling machine, and the plate thickness of the rolled material that has been rolled. In the control mode of controlling the distance between the rolls in the roll pair and controlling the speed of the rolled material sent out from the tension reel based on the tension of the rolled material inserted into the rolling mill, and the rolling mill. The distance between the rolls in the roll pair is controlled based on the tension of the material to be rolled to be inserted, and the speed of the material to be rolled sent out from the tension reel is controlled based on the plate thickness of the rolled material to be rolled. From the control modes, one of the control modes is selected based on the rolling state of the material to be rolled, and the step of executing the selected control mode (hereinafter, also referred to as “first step”) and rolling. Based on the thickness of the material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. It is characterized by having a step (hereinafter, also referred to as "second step").

14 and 15 are schematic views illustrating an example of a rolling method. Here, the rolling control device 11 described above will be described as an example. When rolling, the roll gap is first set initially. This initial setting may be determined in advance, for example, from the experience of rolling performed in the past. Then, at the start of rolling, as shown in FIG. 14, the operator manually increases the mill speed (manual acceleration) for the purpose of improving production efficiency, for example. In foil rolling, as the mill speed increases, the elastic deformation state shifts to the plastic deformation state. , The control mode selection means (control mode selection unit 711) selects the control mode as described above, outputs permission so that the speed correction selection unit 712 executes the control mode, and the control output selection unit 713 outputs the permission. The selected control mode is executed according to the output of (1st step). Here, a control mode using the output from the reduction plate thickness control unit 61 and the speed plate thickness control unit 62 is exemplified.

Since the control method (A) and the control methods (B) and (C) differ in the control method of the input side TR2, it may not be possible to switch during the rolling operation. In that case, the rolling operation may be continued by the control method (A), and the control method may be switched the next time a material to be rolled of the same steel type and the same plate width arrives. If the rolling equipment cannot switch between the control method (A) and the control method (B) and the control method (C) during the rolling operation, the control method (B) is used instead of the control method (A). You may. In this way, in the case of the material to be rolled, which is the control method (A) at low speed but the control method (C) is optimal at high speed, the control method (B) at low speed and the control method (C) at high speed are selected. By doing so, it is possible to roll stably and with high accuracy in the entire speed range.

Here, the optimum control method determined by the control mode selection unit 711 is recorded in a database (see FIG. 16) with the steel type of the material to be rolled m, the plate thickness on the side plate and the mill speed range as parameters, and for example, the next time. At the time of rolling, the optimum control mode may be searched using the above parameters as a search key.

Further, the speed correction selection unit 712 described above may output the speed correction output side plate thickness correction value Δhcmp in order to prevent undershoot of the output side plate thickness deviation at the start of the switched control mode.

Next, when the mill speed approaches the target speed due to the speed increase by manual acceleration, the roll speed selection control means (speed correction selection unit 712) is based on the plate thickness of the rolled material m to be rolled, and the roll R1 in roll vs. R. , Whether or not to control the peripheral speed of R2 is selected, and when the peripheral speed control is selected, the peripheral speeds of the rolls R1 and R2 are controlled according to the output from the control output selection unit 713 (second step). .. As a result, rolling is stably performed by controlling the mill speed by the control method (D). Next, at the end of rolling, as shown in FIG. 15, the control by the control method (D) is shifted to the manual deceleration of the mill speed by the operator (manual deceleration), and the manual deceleration decelerates to the plate passing speed. Finish one rolling. In the case of manual deceleration, contrary to the case of manual acceleration, the speed correction is performed assuming that the output side plate thickness is equal to the entry side plate thickness at the predicted plastic deformation start speed (shifting from the plastic deformation state to the elastic deformation state). The side plate thickness correction value is output, and when the mill speed becomes less than the predicted plastic deformation start speed, the above control mode (compression plate thickness control or speed plate thickness control) is terminated.

Further, in the above-mentioned rolling method, the rolling in which the operator manually accelerates / decelerates (manual acceleration, manual deceleration) at the start and end of rolling has been described, but the acceleration / deceleration is automatically performed by using a known method. May be good. In particular, at the time of deceleration at the end of rolling, it is preferable to calculate the remaining amount of the material to be rolled and stop the rolling mill so that this remaining amount does not occur (remaining amount ≈ 0).

(Rolling control program)
The rolling control program controls a rolling mill that rolls a material to be rolled with a pair of rolls, and controls the distance between rolls in the pair of rolls based on the thickness of the rolled material to be rolled. Based on the control mode that controls the torque of the tension reel that sends the rolled material to the rolling machine to a constant value based on the tension of the rolled material inserted into the rolling machine, and the plate thickness of the rolled material that has been rolled. In the control mode of controlling the distance between the rolls in the roll pair and controlling the speed of the rolled material sent out from the tension reel based on the tension of the rolled material inserted into the rolling mill, and the rolling mill. The distance between the rolls in the roll pair is controlled based on the tension of the material to be rolled to be inserted, and the speed of the material to be rolled sent out from the tension reel is controlled based on the plate thickness of the rolled material to be rolled. From the control modes, one of the control modes is selected based on the rolled state of the material to be rolled, and the step (first step) of executing the selected control mode and the rolled roll. A step of selecting whether or not to control the peripheral speed of the roll in the roll pair based on the plate thickness of the rolled material, and controlling the peripheral speed of the roll when the control of the peripheral speed is selected (second). Step), and is characterized by having.

Since the control method executed by this rolling control program is the same as that described above in the sections of (Rolling control device) and (Rolling control method), detailed description thereof will be omitted.

Here, the control in the rolling control device 11, the rolling control method, and the rolling control program described above can be realized by combining hardware and software. As the hardware, as shown in FIG. 17, for example, a central processing unit (CPU) 91, a random access memory (RAM,) 92, a read-only memory (ROM) 93, a hard disk drive (HDD) 94, and an interface (I). / F) 95, bus 96, etc. can be configured.

The CPU 91 is a calculation means for processing information, and controls the operation of the entire rolling control device 11 based on the processed information. The RAM 92 is a volatile storage medium capable of reading and writing information, and is used as a work area when the CPU 91 processes information. The ROM 93 is a read-only non-volatile storage medium, and stores a program (software). The HDD 94 is a non-volatile storage medium capable of reading and writing information, and stores an OS (operating system), a rolling control program (software) that executes the above-mentioned rolling control method, and the like. The I / F 95 displays information on the rolling control device 11 and inputs information to the rolling control device 11, and is composed of, for example, a display device 951 and a keyboard 952. The bus 96 connects the CPU 91, the HDD 94, and the like.

As described above, the rolling control device 11, the rolling control method, and the rolling control program described above have the above-mentioned configurations, and thus have the control method (A), the control method (B), and the control method (C) according to the rolling state. ) Can be used to select the optimum control configuration for outside plate thickness control and entry side plate thickness control, and mill speed plate thickness control (control method (D)) can maintain a stable plastic working state, even if foil. Even in the case of rolling, it is possible to suppress fluctuations in the plate thickness of the rolled material m to be rolled and improve the accuracy of the output side plate thickness. As a result, product quality and operational efficiency can be significantly improved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The rolling control device 12 controls the distance between the rolls in the roll pair based on the plate thickness of the rolled material to be rolled, and transfers the material to be rolled to the rolling mill based on the tension of the material to be rolled inserted into the rolling machine. It is selected whether or not to control the peripheral speed of the roll in the roll pair based on the tension control means for controlling the torque of the tension reel to be sent out to a constant value (control method (A)) and the plate thickness of the rolled material to be rolled. In addition, the roll speed selection control means for controlling the peripheral speed of the roll when the control of the peripheral speed is selected (control method (D)) is provided.

In order to execute the control methods (A) and (D) performed by the tension control means and the roll speed selection control means described above, the rolling control device 12 specifically, for example, as shown in FIG. 18, roll gap. The control unit 21, the mill speed control unit 31, the entry side TR speed command unit 41, the entry side tension setting unit 43, the exit side tension setting unit 53, the entry side tension current conversion unit 44, and the exit side tension current. Conversion unit 54, entry side TR control unit 42, exit side TR control unit 52, entry side tension control unit 46, exit side tension control unit 56, reduction plate thickness control unit 61, mill speed plate thickness control It can be composed of a unit 65, a mill speed setting unit 81, and a control method selection unit 72. The rolling control device 12 is not limited to the specific configuration shown below. Further, since the configuration of each unit other than the control method selection unit 72 is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted. Further, the rolling control method using the rolling control device 12 is the same as that of the first embodiment except that the control mode is limited to the control methods (A) and (D). Use it.

The control method selection unit 72 performs rolling using the control methods (A) and (D) described above according to the rolling state of the material m to be rolled. As shown in FIG. 19, the control method selection unit 72 is roughly composed of a speed correction selection unit 712, a control mode selection unit 721, and a control output selection unit 723. Since the speed correction selection unit 712 is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

The control mode selection unit 721 outputs a command for executing the control method (A).

The control output selection unit 723 is the output from the reduction plate thickness control unit 61 and the mill speed plate thickness control unit 65, the selection result of the control method (D) from the speed correction selection unit 712, and the output permission signal of the control method (A). Is input, and a control command is output to the roll gap control unit 21, the entry side TR speed command unit 41, the entry side TR control unit 42, and the mill speed setting unit 81.

Specifically, the control output selection unit 723 integrates the output from the rolling plate thickness control unit 61 in order to control the gap between the rolls in the roll to R based on the plate thickness of the rolled material m. Is integrated and output to the roll gap control unit 21. Further, the control output selection unit 723 controls the torque of the tension reel that sends the material m to be rolled to the rolling mill 1 to a constant value based on the tension of the material m to be rolled inserted into the rolling mill 1, so that the torque constant control mode Is output to the incoming TR control unit 42.

Further, the control output selection unit 723 outputs the output from the mill speed plate thickness control unit 65 to the mill speed in order to control the peripheral speeds of the rolls R1 and R2 when the speed correction selection unit 712 selects the control method (D). Output to the setting unit 81.

As described above, when the rolling control device 12 has the above configuration, a stable plastic working state can be maintained by using the control method (A) and the mill speed plate thickness control (control method (D)). Even when foil rolling is performed, it is possible to suppress fluctuations in the plate thickness of the rolled material m and improve the accuracy of the output plate thickness.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. The rolling control device 13 controls the distance between the rolls in the roll pair based on the plate thickness of the rolled material to be rolled, and is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling mill. Based on the velocity tension control means for controlling the speed of the material (control method (B)) and the plate thickness of the rolled material to be rolled, whether or not to control the peripheral speed of the roll in the roll pair is selected, and the circumference is selected. A roll speed selection control means for controlling the peripheral speed of the roll when speed control is selected (control method (D)) is provided.

In order to execute the control methods (B) and (D) performed by the speed tension control means and the roll speed selection control means described above, the rolling control device 13 specifically rolls, for example, as shown in FIG. Gap control unit 21, mill speed control unit 31, entry side TR speed command unit 41, entry side tension setting unit 43, exit side tension setting unit 53, entry side tension current conversion unit 44, exit side tension The current conversion unit 54, the input side TR control unit 42, the exit side TR control unit 52, the input side tension control unit 46, the exit side tension control unit 56, the reduction plate thickness control unit 61, and the speed tension control unit. It can be composed of 63, a mill speed plate thickness control unit 65, a mill speed setting unit 81, and a control method selection unit 73. The rolling control device 13 is not limited to the specific configuration shown below. Further, since the configuration of each unit other than the control method selection unit 73 is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted. Further, the rolling control method using the rolling control device 13 is the same as that of the first embodiment except that the control mode is limited to the control methods (B) and (D). Use it.

The control method selection unit 73 performs rolling using the control methods (B) and (D) described above according to the rolling state of the material m to be rolled. As shown in FIG. 21, the control method selection unit 73 is roughly composed of a speed correction selection unit 712, a control mode selection unit 731, and a control output selection unit 733. Since the speed correction selection unit 712 is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

The control mode selection unit 731 outputs a command for executing the control method (B).

The control output selection unit 733 is the output from the reduction plate thickness control unit 61, the speed tension control unit 63, the mill speed plate thickness control unit 65, the selection result of the control method (D) from the speed correction selection unit 712, and the control method ( The output permission signal of B) is used as an input, and a control command is output to the roll gap control unit 21, the entry side TR speed command unit 41, the entry side TR control unit 42, and the mill speed setting unit 81.

Specifically, the control output selection unit 733 integrates the output from the rolling plate thickness control unit 61 in order to control the gap between the rolls in the roll to R based on the plate thickness of the rolled material m. Is integrated and output to the roll gap control unit 21. Further, the control output selection unit 733 integrates the output from the speed tension control unit 63 in order to control the speed of the material m to be rolled sent out from the tension reel based on the tension of the material m to be rolled inserted into the rolling mill 1. The processing unit performs integration processing and outputs this to the input TR speed command unit 41.

Further, the control output selection unit 733 outputs the output from the mill speed plate thickness control unit 65 to the mill speed in order to control the peripheral speeds of the rolls R1 and R2 when the speed correction selection unit 712 selects the control method (D). Output to the setting unit 81.

As described above, since the rolling control device 13 has the above configuration, it is possible to maintain a stable plastic working state by using the control method (B) and the control method (D), even when foil rolling is performed. Even so, it is possible to suppress fluctuations in the plate thickness of the rolled material m to be rolled and improve the accuracy of the output side plate thickness.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. The rolling control device 14 controls the distance between the rolls in the roll pair based on the tension of the material to be rolled inserted into the rolling mill, and is sent out from the tension reel based on the plate thickness of the rolled material to be rolled. Based on the speed plate thickness control means for controlling the speed of the material (control method (C)) and the plate thickness of the rolled material to be rolled, whether or not to control the peripheral speed of the roll in the roll pair is selected, and at the same time. It is provided with a roll speed selection control means for controlling the peripheral speed of the roll when the control of the peripheral speed is selected (control method (D)).

In order to execute the control methods (C) and (D) performed by the speed plate thickness control means and the roll speed selection control means described above, the rolling control device 14 specifically, for example, as shown in FIG. 22. Roll gap control unit 21, mill speed control unit 31, entry side TR speed command unit 41, entry side tension setting unit 43, exit side tension setting unit 53, entry side tension current conversion unit 44, and exit side. Tension / current conversion unit 54, entry-side TR control unit 42, exit-side TR control unit 52, entry-side tension control unit 46, exit-side tension control unit 56, speed plate thickness control unit 62, and reduction tension control. It can be composed of a unit 64, a mill speed plate thickness control unit 65, a mill speed setting unit 81, and a control method selection unit 74. The rolling control device 14 is not limited to the specific configuration shown below. Further, since the configuration of each unit other than the control method selection unit 74 is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted. Further, the rolling control method using the rolling control device 14 is the same as that of the first embodiment except that the control mode is limited to the control methods (C) and (D). Use it.

The control method selection unit 74 performs rolling using the control methods (C) and (D) described above according to the rolling state of the material m to be rolled. As shown in FIG. 23, the control method selection unit 74 is roughly composed of a speed correction selection unit 712, a control mode selection unit 741, and a control output selection unit 743. Since the speed correction selection unit 712 is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

The control mode selection unit 741 outputs a command for executing the control method (B).

The control output selection unit 743 is the output from the speed plate thickness control unit 62, the reduction tension control unit 64, the mill speed plate thickness control unit 65, the selection result of the control method (D) from the speed correction selection unit 712, and the control method ( The output permission signal of C) is used as an input, and a control command is output to the roll gap control unit 21, the entry side TR speed command unit 41, the entry side TR control unit 42, and the mill speed setting unit 81.

Specifically, the control output selection unit 743 outputs the output from the speed plate thickness control unit 62 in order to control the speed of the material m to be rolled sent out from the tension reel based on the plate thickness of the rolled material m to be rolled. The integration processing unit performs integration processing and outputs this to the input TR speed command unit 42. Further, the control output selection unit 743 integrates the output from the rolling tension control unit 64 in order to control the gap between the rolls in the roll vs. R based on the tension of the material m to be rolled inserted in the rolling mill 1. This is output to the roll gap control unit 21.

Further, the control output selection unit 743 outputs the output from the mill speed plate thickness control unit 65 to the mill speed in order to control the peripheral speeds of the rolls R1 and R2 when the speed correction selection unit 712 selects the control method (D). Output to the setting unit 81.

As described above, since the rolling control device 14 has the above configuration, it is possible to maintain a stable plastic working state by using the control method (C) and the control method (D), even when foil rolling is performed. Even so, it is possible to suppress fluctuations in the plate thickness of the rolled material m to be rolled and improve the accuracy of the output side plate thickness.

It should be noted that the present invention is not limited to the configuration of the above-described embodiment, but is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. Will be done.

For example, in the above-described embodiment, the rolling control device and the like have been described by exemplifying a single-stand rolling mill as the rolling mill 1 controlled by the rolling control devices 11 to 14, but a tandem rolling mill having a plurality of stands (not shown). It may be a rolling control device that controls the above. The rolling control device used in such a tandem rolling mill is the most downstream stand (the rearmost stand among the plurality of stands) so that the material to be rolled is in a plastically deformed state in all of the plurality of stands of the tandem rolling mill. The mill speed may be controlled by the roll speed selection control means. In this case, the protruding side plate thickness can be obtained by measuring with a plate thickness gauge installed on the protruding side of each stand or by comparing the mill speeds of the front and rear stands.

m Rolled material R roll vs. R1 roll (upper work roll)
R2 roll (lower work roll)
1 Rolling machine 2 Input side tension reel 3 Out side tension reel 11-14 Rolling control device

Claims (4)

A rolling control device that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. Tension control means that controls the torque of the tension reel to a constant value,
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling machine. Speed tension control means to control the speed of
The distance between the rolls in the roll pair is controlled based on the tension of the material to be rolled inserted into the rolling machine, and the material to be rolled is sent out from the tension reel based on the plate thickness of the rolled material that has been rolled. Speed plate thickness control means to control the speed of
Control mode selection means for selecting one of control modes based on the rolled state of the material to be rolled, control by the tension control means, control by the speed tension control means, and control by the speed plate thickness control means. When,
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. Rolling speed selection control means, and a rolling control device. The control mode in the control mode selection means is a change in the tension of the material to be rolled inserted into the rolling machine when the distance between the rolls is changed in a stepped manner during rolling of the material to be rolled, and rolling. The rolling control device according to claim 1, which is selected based on the variation in the plate thickness of the material to be rolled. It is a rolling control method that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
A tension that controls the distance between the rolls in the roll pair based on the thickness of the rolled material to be rolled and sends the material to be rolled to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. A control mode that controls the reel torque to a constant value,
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling mill. The tension reel controls the distance between the rolls in the roll pair based on the control mode for controlling the speed and the tension of the material to be rolled inserted into the rolling mill, and is based on the plate thickness of the material to be rolled. From the control modes for controlling the speed of the material to be rolled, one of the control modes is selected based on the rolling state of the material to be rolled, and the step of executing the selected control mode.
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. A rolling control method, characterized in that it is equipped with steps to be performed. A rolling control program that controls a rolling mill that rolls a material to be rolled with a pair of rolls.
A tension that controls the distance between the rolls in the roll pair based on the thickness of the rolled material to be rolled and sends the material to be rolled to the rolling machine based on the tension of the material to be rolled inserted into the rolling machine. A control mode that controls the reel torque to a constant value,
The distance between the rolls in the roll pair is controlled based on the thickness of the rolled material to be rolled, and the material to be rolled is sent out from the tension reel based on the tension of the material to be rolled inserted into the rolling mill. The tension reel controls the distance between the rolls in the roll pair based on the control mode for controlling the speed and the tension of the material to be rolled inserted into the rolling mill, and is based on the plate thickness of the material to be rolled. From the control modes for controlling the speed of the material to be rolled, one of the control modes is selected based on the rolling state of the material to be rolled, and the step of executing the selected control mode.
Based on the thickness of the rolled material to be rolled, it is selected whether or not to control the peripheral speed of the roll in the roll pair, and when the control of the peripheral speed is selected, the peripheral speed of the roll is controlled. A rolling control program characterized by having steps and.

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