JP2020196034A - Speed control device of roller, method thereof, and rolling system - Google Patents

Abstract

To provide a speed control device of a roller capable of reducing the generation of slip flaws in a roller that controls the speed of a mill motor at a constant target speed, a speed control method, and a rolling system.SOLUTION: A speed control device of a roller 1 that controls the speed of roller material WK in the roller 1 that controls the speed of a mill motor 8 at a constant target speed, includes tension reels 2 and 3 winding up the rolling material WK, tension reel motors 6 and 7 for driving tension reels 2 and 3, first reel motor control portions 9, 10, and 12 that control wind-up tension to be target tension by controlling the speed of the tension reel motors 6 and 7, speed meters 13 and 14 that measures outlet side speed of the rolling material WK, and second reel motor control portions 15 to 22 that control the tension reel motors 6 and 7 to reduce the outlet side speed when the outlet side speed of the rolling material WK measured by the speed meters 13 and 14 exceeds a predetermined allowable upper limit speed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a speed control device and a speed control method for a rolling mill that controls the speed of a rolled material rolled by the rolling mill. The present invention relates to a rolling system including such a speed control device.

Conventionally, a product having a desired thickness (plate thickness) has been manufactured by rolling a rolled material such as a film or a steel plate with a rolling mill equipped with a pair of work rolls. In manufacturing this product, for example, in order to obtain a desired quality, various controls are applied to the rolling mill. For example, Patent Document 1 proposes a speed control method for a skin pass mill. There is.

The speed control method of the skin pass mill disclosed in Patent Document 1 is a speed control method of the electric motor of the skin pass mill in which bridle rolls are arranged on both sides of the rolling mill to control the elongation of the strip, and at least rolling. By calculating the torque to be generated by the electric motor during rolling from the rolling load of the machine and controlling the electric motor of the rolling mill to generate the torque obtained by the calculation, the speed of the work roll and the strip can be controlled. It is to synchronize.

Japanese Unexamined Patent Publication No. 2006-43734

The speed control method of the skin path mill disclosed in Patent Document 1 can prevent the occurrence of an excessive speed difference between the work roll and the strip (corresponding to the rolled material) by the above configuration, and as a result, the work roll and the strip It is possible to prevent the occurrence of slip flaws caused by the occurrence of an excessive speed difference. By the way, in the speed control method of the skin path mill disclosed in Patent Document 1, since the torque of the work roll electric motor (so-called mill motor) is controlled, the mill motor is driven at a constant target speed in order to satisfy a predetermined quality. As such, it cannot be applied to a rolling mill that controls the speed of a mill motor.

The present invention has been made in view of the above circumstances, and an object of the present invention is a speed control device and speed of a rolling mill capable of reducing the occurrence of slip flaws in a rolling mill that controls the speed of a mill motor at a constant target speed. It is an object of the present invention to provide a control method and a rolling system including the speed control device.

As a result of various studies, the present inventor has found that the above object can be achieved by the following invention. That is, the speed control device of the rolling mill according to one aspect of the present invention further controls the speed of the rolled material in the rolling mill that controls the speed of the mill motor for driving a pair of work rolls for rolling the rolled material at a constant target speed. The winding tension is the target tension by controlling the speeds of the tension reel that winds the rolled material rolled by the work roll, the tension reel motor that drives the tension reel, and the tension reel motor. A first reel motor control unit that controls the tension reel motor so as to be, an output speed measuring unit that measures the output speed of the rolled material, and an output of the rolled material measured by the output speed measuring unit. A second reel motor control unit that controls the tension reel motor is provided so as to reduce the output side speed of the rolled material when the side speed exceeds a preset allowable upper limit speed.

In such a speed control device of a rolling mill, when the output speed of the rolled material measured by the output speed measuring unit exceeds a preset allowable upper limit speed, the output speed of the rolled material is reached. Since the tension reel motor is controlled so as to decelerate the speed, even if the speed of the mill motor is controlled at a constant target speed, the output speed of the rolled material can be suppressed to the allowable upper limit speed or less, and slip flaws can occur. Can be reduced.

In another aspect, in the speed control device of the rolling mill, the first reel motor control unit controls the target tension setting unit for setting the target tension and the speed of the tension reel motor to control the winding. A control unit that controls the tension reel motor so that the taking tension becomes the target tension set in the target tension setting unit is provided, and the second reel motor control unit is measured by the output side speed measuring unit. When the output side speed of the rolled material exceeds the allowable upper limit speed, the output side speed of the rolled material measured by the output side speed measuring unit is set in advance and is slower than the allowable upper limit speed. The target tension set by the target tension setting unit is corrected so as to reduce the output side speed of the rolled material until it becomes equal to or lower than the side speed.

In such a speed control device for a rolling mill, the second reel motor control unit corrects the target tension set by the target tension setting unit of the first reel motor control unit, so that the speed of the mill motor is controlled at a constant target speed. In addition, a second tension reel control unit that controls the output side speed in order to reduce the occurrence of slip flaws can be added to the device that controls the tension of the tension reel at a constant target tension.

The method for controlling the speed of a rolling mill according to another aspect of the present invention further controls the speed of the rolled material in a rolling mill that controls the speed of a mill motor for driving a pair of work rolls for rolling the rolled material at a constant target speed. In this method, the winding tension becomes the target tension by controlling the speed of the tension reel motor and the drive process of driving the tension reel that winds the rolled material rolled by the work roll with the tension reel motor. The first reel motor control step for controlling the tension reel motor, the output speed measuring step for measuring the output speed of the rolled material, and the output speed of the rolled material measured in the output speed measuring step. A second reel motor control step for controlling the tension reel motor is provided so as to reduce the output side speed of the rolled material when the temperature exceeds a preset allowable upper limit speed.

In such a speed control method of the rolling mill, when the output speed of the rolled material measured in the output speed measuring step exceeds a preset allowable upper limit speed, the output speed of the rolled material is increased. Since the tension reel motor is controlled so as to decelerate the speed, even if the speed of the mill motor is controlled at a constant target speed, the output speed of the rolled material can be suppressed to the allowable upper limit speed or less, and slip flaws can occur. Can be reduced.

The rolling system according to another aspect of the present invention includes a rolling mill that controls the speed of a mill motor that drives a pair of work rolls for rolling a rolled material at a constant target speed, and a rolling mill that further controls the speed of the rolled material. The speed control device of the rolling mill is the speed control device of any of the above-mentioned rolling mills.

According to this, it is possible to provide a rolling system provided with a speed control device for any of the above-mentioned rolling mills. Since this rolling system is provided with a speed control device for any of the above-mentioned rolling mills, the output speed of the rolled material can be suppressed to the allowable upper limit speed or less, and the occurrence of slip flaws can be reduced.

The speed control device and speed control method of the rolling mill according to the present invention can reduce the occurrence of slip flaws in the rolling mill that controls the speed of the mill motor at a constant target speed. According to the present invention, it is possible to provide a rolling system including such a speed control device.

It is a figure which shows the structure of the rolling system in an embodiment. It is a flowchart which shows the operation about the speed control of a rolled material in the rolling system. It is a time chart for demonstrating the operation about the speed control of a rolled material in the rolling system.

Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. It should be noted that the configurations with the same reference numerals in the respective drawings indicate the same configurations, and the description thereof will be omitted as appropriate. In the present specification, when they are collectively referred to, they are indicated by reference numerals without subscripts, and when they refer to individual configurations, they are indicated by reference numerals with subscripts.

The rolling system according to the embodiment includes a rolling mill that controls the speed of a mill motor that drives a pair of work rolls for rolling the rolled material at a constant target speed, and a speed control device for the rolling mill that further controls the speed of the rolled material. It is a system to prepare. Then, in the present embodiment, the speed control device of the rolling mill determines the speeds of the tension reel that winds the rolled material rolled by the work roll, the tension reel motor that drives the tension reel, and the tension reel motor. A first reel motor control unit that controls the tension reel motor so that the take-up tension becomes a target tension by controlling, a discharge side speed measuring unit that measures the discharge side speed of the rolled material, and the discharge side speed. A second that controls the tension reel motor so as to reduce the output side speed of the rolled material when the output side speed of the rolled material measured by the measuring unit exceeds a preset allowable upper limit speed. It is equipped with a reel motor control unit. Such a rolling system will be described more specifically using a reverse rolling mill.

FIG. 1 is a diagram showing a configuration of a rolling system according to an embodiment. More specifically, for example, as shown in FIG. 1, the rolling system S includes the rolling mill 1, the first and second tension reels 2, 3, the first and second deflector rolls 4, 5, and the first. 1st and 2nd tension reel motors 6 and 7, mill motor 8, 1st and 2nd tension reel motor drive units 9 and 10, mill motor drive unit 11, target tension setting unit 12, 1st and 2nd speed A total of 13, 14, 1st and 2nd addition units 15 and 16, changeover switch 17, correction determination unit 18, on / off switch 19, target output side speed setting unit 20, and allowable upper limit speed setting unit 21. , A speed control correction value generation unit 22, and for example, a strip-shaped rolled material WK wound around the first and second tension reels 2 and 3 is arranged between the first and second tension reels 2 and 3. It is rolled by the rolling mill 1. The plate thickness of the rolled product produced by this rolling system S may be arbitrary, but in view of recent thinning, it is preferably in a region of, for example, several hundred microns or less or 100 μm or less.

The rolling mill 1 is an apparatus in which a rolled material WK is passed between a pair of work rolls and deformed by receiving a force from the pair of work rolls to reduce the thickness and form the target thickness. In the present embodiment, one of the pair of work rolls is provided, and the rolled material WK is passed between the pair of work rolls one or more times in the forward direction and the reverse direction, thereby sequentially passing each time (each pass). This is a reverse rolling mill that reduces the thickness of the rolling mill and molds it to the target thickness. More specifically, in the rolling mill 1, for example, a pair of first and second work rolls WR-1, WR- that roll the rolled material WK through the rolled material WK while applying a force between them by a reduction device (not shown). 2 and a pair of first and second backup rolls BR-1 and BR-2 that support the pair of first and second work rolls WR-1 and WR-2, respectively. In the example shown in FIG. 1, one work roll WR is supported by one backup roll BR, but may be supported by a plurality of backup roll BRs. That is, the rolling mill 1 may be a multi-stage rolling mill such as a vertical mill or a cluster mill. The reduction device moves one of the pair of first and second work rolls WR-1 and WR-2 closer to or further from the other, thereby moving the pair of first and second work rolls. It is a device that reduces the pair of first and second work rolls WR-1 and WR-2 while adjusting the length (width, roll gap length) of the gap between WR-1 and WR-2.

The first tension reel 2 is arranged on one side of the rolling mill 1 at a position separated from the rolling mill 1 by a predetermined distance, and while applying tension to the rolled material WK, it corresponds to the moving direction of the rolled material WK. It is an apparatus that unwinds or winds the rolled material WK. The first tension reel 2 is configured to include a columnar member (lead drum) that can rotate around a predetermined axis. The second tension reel 3 is arranged on the opposite side of the rolling mill 1 at a position separated from the rolling mill 1 by a predetermined distance, and while applying tension to the rolled material WK, it corresponds to the moving direction of the rolled material WK. It is an apparatus that either winds up or unwinds the rolled material WK. The second tension reel 3 is configured to include a columnar member (lead drum) that can rotate around a predetermined axis.

The first deflector roll 4 is a columnar member that can rotate around a predetermined axis and is arranged between the first tension reel 2 and the rolling mill 1 at a position separated from the rolling mill 1 by a predetermined distance. Is. The second deflector roll 5 is a columnar member that can rotate around a predetermined axis and is arranged between the rolling mill 1 and the second tension reel 3 at a position separated from the rolling mill 1 by a predetermined distance. Is.

The first tension reel motor 6 is a motor that is connected to the first tension reel motor drive unit 9 and rotates the first tension reel 2. The second tension reel motor 7 is a motor that is connected to the second tension reel motor drive unit 10 and rotates the second tension reel 3.

The target tension setting unit 12 receives an input of the target tension by the user (operator), and receives first and second control signals (first and second control command values, first and 22nd tension control) according to the target tension. (Current value) is a device that outputs each to the first and second adder units 15 and 16, respectively.

The first tension reel motor drive unit 9 controls the speed of the first tension reel motor 6 so that the take-up tension becomes the target tension received by the target tension setting unit 12, and the first tension reel motor 6 It is a device that controls. More specifically, in the present embodiment, the first tension reel motor drive unit 9 starts from the target tension setting unit 12 when the target tension is not corrected as described later in order to reduce the occurrence of slip flaws. The electric power corresponding to the first control signal input via the first addition unit 15 is supplied to the first tension reel motor 6. As a result, the speed of the first tension reel motor 6 is controlled, and the tension is controlled so that the winding tension becomes the target tension, and the first tension reel motor 6 is driven.

The second tension reel motor drive unit 10 controls the speed of the second tension reel motor 7 so that the take-up tension becomes the target tension received by the target tension setting unit 12, and the second tension reel motor 7 It is a device that controls. More specifically, in the present embodiment, the second tension reel motor drive unit 10 starts from the target tension setting unit 12 when the target tension is not corrected as described later in order to reduce the occurrence of slip flaws. The electric power corresponding to the second control signal input via the second addition unit 16 is supplied to the second tension reel motor 7. As a result, the speed of the second tension reel motor 7 is controlled, and the tension is controlled so that the winding tension becomes the target tension, and the second tension reel motor 7 is driven.

Here, in a state where the rolled material WK is wound, the radius (coil radius) from the axis of the tension reel to the outer surface of the rolled material WK is D, the tension applied to the rolled material WK is T, and the torque of the motor. Is τ, it is expressed as T = τ / D. By controlling the torque of the tension reel motor according to the coil radius D, the tension T applied to the rolled material WK is controlled.

The mill motor 8 is a motor that is connected to the mill motor drive unit 11 and rotates the pair of first and second work rolls WR-1 and WR-2. The mill motor drive unit 11 is a circuit that drives the mill motor 8 by supplying a predetermined electric power to the mill motor 8 so as to control the speed at a constant target speed.

When the target tension is not corrected as described later in order to reduce the occurrence of slip flaws, rolling is performed in the positive direction indicated by the arrow (→) in FIG. 1 (in FIG. 1, the direction from the left side to the right side of the paper surface). In the case of a path in which the material WK moves, the first and second tension reels 2, 3, the first and second deflector rolls 4, 5, the first and second tension reel motors 6, 7, and the mill motor are used with respect to the rolling mill 1. 8. The first and second tension reel motor drive units 9, 10, the mill motor drive unit 11, and the target tension setting unit 12 function as follows. That is, the first tension reel 2 becomes the unwinding side tension reel, is rotationally driven by the first tension reel motor 6, and supplies the wound rolled material WK to the rolling mill 1. At this time, the first tension reel motor drive unit 9 controls the speed of the first tension reel motor 6, so that the take-up tension of the second tension reel 3 is the target tension received by the target tension setting unit 12. The first tension reel motor 6 is controlled in response to the first control signal. The first deflector roll 4 changes the direction of the rolled material WK unwound from the first tension reel 2 to the horizontal direction. The rolling mill 1 rolls the rolled material WK. At this time, the mill motor drive unit 11 drives the mill motor 8 by supplying a predetermined electric power to the mill motor 8 so as to control the speed at a constant target speed, and the mill motor drives a pair of first and second work rolls. The WR-1 and WR-2 are rotationally driven. The second deflector roll 5 changes the horizontal rolled material WK sent from the rolling mill 1 in the direction of the second tension reel 3. The second tension reel 3 serves as a take-up side tension reel, is rotationally driven by the second tension reel motor 7, and winds and accommodates the rolled material WK rolled by the rolling mill 1. At this time, the second tension reel motor drive unit 10 controls the speed of the second tension reel motor 7 so that the take-up tension becomes the target tension received by the target tension setting unit 12. 2 The second tension reel motor 7 is controlled according to the control signal.

When the target tension is not corrected as described later in order to reduce the occurrence of slip flaws, on the other hand, the direction opposite to the forward direction indicated by the arrow (→) in FIG. 1 (in FIG. 1, from the right side of the paper surface). In the case of a path in which the rolled material WK moves in the direction toward the left side), the first and second tension reels 2, 3, the first and second deflector rolls 4, 5, the first and second tensions are applied to the rolling mill 1. The reel motors 8 and 9, the mill motor 8, the first and second tension reel motor drive units 9 and 10, the mill motor drive unit 11, and the target tension setting unit 12 function as follows. That is, the second tension reel 3 becomes the unwinding side tension reel, is rotationally driven by the second tension reel motor 7, and supplies the wound rolled material WK to the rolling mill 1. At this time, the second tension reel motor drive unit 10 controls the speed of the second tension reel motor 7, so that the take-up tension of the first tension reel 2 is the target tension received by the target tension setting unit 12. The second tension reel motor 7 is controlled in response to the second control signal. The second deflector roll 5 changes the direction of the rolled material WK unwound from the second tension reel 3 to the horizontal direction. The rolling mill 1 rolls the rolled material WK. At this time, the mill motor drive unit 11 drives the mill motor 8 by supplying a predetermined electric power to the mill motor 8 so as to control the speed at a constant target speed, and the mill motor drives a pair of first and second work rolls. The WR-1 and WR-2 are rotationally driven. The first deflector roll 4 changes the horizontal rolled material WK sent from the rolling mill 1 in the direction of the first tension reel 2. The first tension reel 2 becomes a take-up side tension reel, is rotationally driven by the first tension reel motor 6, and winds and accommodates the rolled material WK rolled by the rolling mill 1. At this time, the first tension reel motor drive unit 9 controls the speed of the first tension reel motor 6 so that the take-up tension becomes the target tension received by the target tension setting unit 12. 1 The first tension reel motor 6 is controlled according to the control signal.

When the target tension is not corrected as described later in order to reduce the occurrence of slip flaws, the mill motor 8 is speed-controlled at a constant target speed, and the first and second tension reel motors 8 and 9, respectively. , The tension is controlled so that the winding tension becomes the target tension.

Subsequently, in the rolling system S that controls the speed of the mill motor 8 and the tensions of the first and second tension reel motors 8 and 9, the configuration and operation for suppressing the occurrence of slip flaws will be described.

First, a configuration for suppressing the occurrence of slip flaws will be described.

The first speedometer 13 is an apparatus for measuring the moving speed of the rolled material WK by measuring the rotation speed of the first deflector roll 4. In the present embodiment, the first speedometer 13 is, for example, a pulse generator that measures the rotational speed of the first deflector roll 4. The first speedometer 13 is connected to the correction determination unit 18, and outputs the measured moving speed of the rolled material WK (rotational speed of the first deflector roll 4) to the correction determination unit 18. The second speedometer 14 is an apparatus for measuring the moving speed of the rolled material WK by measuring the rotation speed of the second deflector roll 5. In the present embodiment, the second speedometer 14 is, for example, a pulse generator that measures the rotation speed of the second deflector roll 5. The second speedometer 14 is connected to the correction determination unit 18, and outputs the measured moving speed of the rolled material WK (rotational speed of the second deflector roll 5) to the correction determination unit 18.

The first and second speedometers 13 and 14 are not limited to the pulse generator, respectively, and may be other speedometers. For example, the first speedometer 13 may be a laser Doppler speedometer or the like arranged between the rolling mill 1 and the first deflector roll 4, and the second speedometer 14 may be the rolling mill 1 and the second deflector. A laser Doppler speedometer or the like arranged between the roll 5 and the like may be used.

The target exit speed setting unit 20 is a device that receives an input of the target exit speed Vdset of the mill motor 8 by the user (operator). The target exit speed setting unit 20 includes, for example, a keyboard, a numeric keypad, a rotary switch, a DIP switch, and the like. The target output side speed setting unit 20 is connected to the correction determination unit 18, and outputs the input target output side speed Vdset to the correction determination unit 18. When the target output side speed Vdset is a preset fixed value, the target output side speed setting unit 20 may be omitted, and the target output side speed Vdset may be stored in the correction determination unit 18 in advance.

The allowable upper limit speed setting unit 21 is a device that receives an input of the allowable upper limit speed VdL of the rolled material WK by the user (operator). The allowable upper limit speed setting unit 21 includes, for example, a keyboard, a numeric keypad, a rotary switch, a DIP switch, and the like. The allowable upper limit speed setting unit 21 is connected to the correction determination unit 18, and outputs the input allowable upper limit speed VdL to the correction determination unit 18. When the allowable upper limit speed VdL is a preset fixed value, the allowable upper limit speed setting unit 21 may be omitted, and the allowable upper limit speed VdL may be stored in the correction determination unit 18 in advance.

The permissible upper limit speed VdL is an upper limit value of the speed permissible with respect to the moving speed of the rolled material WK, and is determined to be an appropriate value so as not to cause slip flaws. The target exit speed Vdset is a value set to end the speed control of the tension reel motor executed to suppress the occurrence of slip flaws, and is determined to be an appropriate value slower than the allowable upper limit speed VdL. Reel. The difference between the permissible upper limit speed VdL and the target exit speed Vdset is a speed that is permissible with respect to the target exit speed Vdset so as not to cause slip defects. For example, the permissible upper limit speed VdL and the target exit speed Vdset are each investigated using a plurality of samples and acquired by the user (operator). Alternatively, for example, the user (operator) may determine the allowable upper limit speed VdL and the target exit speed Vdset, respectively, based on his / her experience.

The speed control correction value generation unit 22 is a device that generates a correction signal (correction value, correction current value) for correcting the target tension set by the target tension setting unit 12 so as to reduce the output side speed of the rolled material WK. Is. The speed control correction value generation unit 22 is connected to the changeover switch 17 via the on / off switch 19, and outputs the generated correction signal to the changeover switch 17 via the on / off switch 19.

The on / off switch 19 is a switch that turns on / off the output of the correction signal generated by the speed control correction value generation unit 22 to the changeover switch 17. The on / off switch 19 is connected to the correction determination unit 18, and the on / off is controlled by the correction determination unit 18. When the on / off switch 19 is turned on by the correction determination unit 18, the correction signal generated by the speed control correction value generation unit 22 is output to the changeover switch 17. On the other hand, when the on / off switch 19 is turned off by the correction determination unit 18, the correction signal generated by the speed control correction value generation unit 22 is not output to the changeover switch 17.

The changeover switch 17 is a 1 × 2 (1 input, 2 output) switch including the first to third terminals. The speed control correction value generation unit 22 is connected to the first input terminal via the on / off switch 19, and the correction signal generated by the speed control correction value generation unit 22 is turned on / off when the on / off switch 19 is turned on. It is input via the switch 19. When the first adder 15 is connected to the second terminal of the output and the first terminal and the second terminal are connected by the switch operation, the correction signal input to the first terminal is the second. It is output to the first addition unit 15 via the terminal. When the second adder 16 is connected to the third terminal of the output and the first terminal and the third terminal are connected by the switch operation, the correction signal input to the first terminal is the third. It is output to the second addition unit 16 via the terminal. The first terminal is selectively connected to either the second terminal or the third terminal, and when the rolled material WK moves in the positive direction described above, the first terminal is connected to the third terminal. On the other hand, when the rolled material WK moves in the opposite direction as described above, the first terminal is connected to the second terminal. Such a switch operation may be executed manually by a user (operator), or may be automatically executed by a device (not shown).

The first addition unit 15 is a device that adds the input from the target tension setting unit 12 and the input from the changeover switch 17. The first addition unit 15 is connected to the first tension reel motor drive unit 9, and outputs the addition result to the first tension reel motor drive unit 9. More specifically, in the present embodiment, when the correction signal is not input from the changeover switch 17, the first addition unit 15 uses the first control signal (first control command value) from the target tension setting unit 12. , 1st tension control current value) is output to the 1st tension reel motor drive unit 9, and when a correction signal (correction value, correction current value) is input from the changeover switch 17, the 1st addition unit 15 Adds the first control signal from the target tension setting unit 12 and the correction signal from the changeover switch 17, and the addition result (first control signal + correction signal (first control command value + correction value, first tension control) (Current value value + correction current value)) is output to the first tension reel motor drive unit 9.

The second addition unit 16 is a device that adds the input from the target tension setting unit 12 and the input from the changeover switch 17. The second addition unit 16 is connected to the second tension reel motor drive unit 10, and outputs the addition result to the second tension reel motor drive unit 10. More specifically, in the present embodiment, when the correction signal is not input from the changeover switch 17, the second addition unit 16 uses the second control signal (second control command value) from the target tension setting unit 12. , Second tension control current value) is output to the second tension reel motor drive unit 10, and when a correction signal (correction value, correction current value) is input from the changeover switch 17, the second addition unit 16 Adds the second control signal from the target tension setting unit 12 and the correction signal from the changeover switch 17, and the addition result (second control signal + correction signal (second control command value + correction value, second tension control) (Current value value + correction current value)) is output to the second tension reel motor drive unit 10.

The correction determination unit 18 is a device that determines whether or not to control the take-up side tension reel motor so as to reduce the output side speed Vd of the rolled material WK. When the output side speed Vd of the rolled material WK exceeds the allowable upper limit speed VdL, the correction determination unit 18 outputs the rolled material WK until the output side speed Vd of the rolled material WK becomes equal to or less than the target output side speed Vdset. The winding side tension reel motor is controlled so as to reduce the side speed Vd. In the present embodiment, the deceleration of the output side speed Vd of the rolled material WK is performed by correcting the target tension received by the target tension setting unit 12 with the correction signal generated by the speed control correction value generation unit 22.

More specifically, when the rolled material WK moves in the positive direction described above, the second speedometer 14 serves as an output speed measuring unit for measuring the output speed Vd of the rolled material WK, and the correction determination unit 18 Compares the output side speed Vd of the rolled material WK measured by the second speedometer 14, the allowable upper limit speed VdL, and the target output side speed Vdset, respectively. As a result of this comparison, when the output side speed Vd of the rolled material WK measured by the second speedometer 14 exceeds the allowable upper limit speed VdL, the correction determination unit 18 turns on the on / off switch 19. As a result, the correction signal generated by the speed control correction value generation unit 22 is output to the second addition unit 16 via the on / off switch 19 and the changeover switch 17. The second addition unit 16 adds the second control signal from the target tension setting unit 12 and the correction signal from the changeover switch 17, and adds the addition result (second control signal + correction signal (second control command value + correction value). , Second tension control current value + correction current value)) is output to the second tension reel motor drive unit 10. As a result, the target tension set by the target tension setting unit 12 is corrected so as to reduce the output side speed Vd of the rolled material WK, and the second tension reel is reduced so as to reduce the output side speed Vd of the rolled material WK. The second tension reel motor 7 is driven and controlled by the motor drive unit 10. As a result of the comparison, when the output side speed Vd of the rolled material WK measured by the second speedometer 14 is equal to or less than the target output side speed Vdset, the correction determination unit 18 turns off the on / off switch 19. As a result, the correction signal generated by the speed control correction value generation unit 22 is not output to the second addition unit 16 via the on / off switch 19 and the changeover switch 17. The second addition unit 16 outputs the second control signal from the target tension setting unit 12 to the second tension reel motor drive unit 10. Therefore, the target tension set by the target tension setting unit 12 is not corrected, and the take-up tension is set to the target tension received by the target tension setting unit 12 by the second tension reel motor drive unit 10 as described above. The second tension reel motor 7 is driven and controlled in response to the second control signal.

On the other hand, when the rolled material WK moves in the opposite direction as described above, the first speedometer 13 becomes the output side speed measuring unit for measuring the output side speed Vd of the rolled material WK, and the correction determination unit 18 becomes the first The output side speed Vd of the rolled material WK measured by the speedometer 13, the allowable upper limit speed VdL, and the target output side speed Vdset are compared with each other. As a result of this comparison, when the output side speed Vd of the rolled material WK measured by the first speedometer 13 exceeds the allowable upper limit speed VdL, the correction determination unit 18 turns on the on / off switch 19. As a result, the correction signal generated by the speed control correction value generation unit 22 is output to the first addition unit 15 via the on / off switch 19 and the changeover switch 17. The first addition unit 15 adds the first control signal from the target tension setting unit 12 and the correction signal from the changeover switch 17, and adds the addition result (first control signal + correction signal (first control command value + correction value). , 1st tension control current value + correction current value)) is output to the 1st tension reel motor drive unit 9. As a result, the target tension set by the target tension setting unit 12 is corrected so as to reduce the output side speed Vd of the rolled material WK, and the first tension reel is reduced so as to reduce the output side speed Vd of the rolled material WK. The first tension reel motor 6 is driven and controlled by the motor drive unit 9. As a result of the comparison, when the output side speed Vd of the rolled material WK measured by the first speedometer 13 is equal to or less than the target output side speed Vdset, the correction determination unit 18 turns off the on / off switch 19. As a result, the correction signal generated by the speed control correction value generation unit 22 is not output to the first addition unit 15 via the on / off switch 19 and the changeover switch 17. The first addition unit 15 outputs the first control signal from the target tension setting unit 12 to the first tension reel motor drive unit 9. Therefore, the target tension set by the target tension setting unit 12 is not corrected, and the take-up tension is set to the target tension received by the target tension setting unit 12 by the first tension reel motor drive unit 9 as described above. The first tension reel motor 6 is driven and controlled in response to the first control signal.

These first and second addition units 15 and 16, changeover switch 17, correction determination unit 18, on / off switch 19, target output side speed setting unit 20, allowable upper limit speed setting unit 21, and speed control correction value generation unit 22 are, for example, , It may be composed of individual electric parts or electronic parts, or it may be composed of, for example, a notebook type or desktop type computer. In this case, the first and second addition units 15 and 16, the changeover switch 17, the correction determination unit 18, the on / off switch 19, and the speed control correction value generation unit 22 are functionally configured by software, respectively, and the target output speed. The setting unit 20 and the allowable upper limit speed setting unit 21 are composed of, for example, a keyboard, a touch panel, or the like. Further, the first and second tension reel motor drive units 9 and 10, the mill motor drive unit 11 and the target tension setting unit 12 may also be composed of, for example, individual electric parts or electronic parts, or, for example, a notebook type or the like. It may consist of a desktop computer.

Next, the operation for suppressing the occurrence of slip flaws will be described. FIG. 2 is a flowchart showing an operation related to speed control of a rolled material in the rolling system. FIG. 3 is a time chart for explaining the operation related to the speed control of the rolled material in the rolling system. The upper part of FIG. 3 shows the output side speed of the rolled material WK as an example, and the lower part of FIG. 3 shows the on / off operation of the on / off switch 17. The upper and lower horizontal axes of FIG. 3 are elapsed times, the upper vertical axis of FIG. 3 is the exit speed of the rolled material WK, and the lower vertical axis of FIG. 3 is the on operation and the off operation. is there.

Hereinafter, the operation related to the speed control of the rolled material WK in the rolling system S when the rolled material WK moves in the positive direction described above will be described, but the same applies when the rolled material WK moves in the reverse direction described above. I can explain.

When the rolled material WK moves in the positive direction described above, as described above, the second speedometer 14 serves as the output speed measuring unit, and the changeover switch 17 connects the first terminal and the third terminal. Switch to operation. In the rolling system S, the mill motor 8 is speed-controlled at a constant target speed during the following operations shown in FIG.

In FIG. 2, first, the correction determination unit 18 reads the measured moving speed of the rolled material WK as the output side speed Vd from the second speedometer 14 (S1).

Subsequently, the correction determination unit 18 reads the received allowable upper limit speed VdL at the output side speed Vd of the rolled material WK from the allowable upper limit speed setting unit 21 (S2).

Subsequently, the correction determination unit 18 reads the received target exit speed Vdset of the rolled material WK from the target output speed setting unit 20 (S3).

Subsequently, the correction determination unit 18 compares the output side speed Vd of the rolled material WK read in the process S1 with the allowable upper limit speed VdL read in the process S2, and the output side speed Vd exceeds the allowable upper limit speed VdL. It is determined whether or not it is (S4). As a result of this determination, when the output side speed Vd exceeds the allowable upper limit speed VdL (Yes), the correction determination unit 18 then executes the process S7. On the other hand, as a result of the determination, when the output side speed Vd does not exceed the allowable upper limit speed VdL, that is, when the exit side speed Vd is equal to or less than the allowable upper limit speed VdL (No), the correction determination unit Next, the process 18 executes the process S5.

In this process S5, the correction determination unit 18 compares the output side speed Vd of the rolled material WK read in the process S1 with the target output side speed Vdset read in the process S3, and the output side speed Vd is the target output side. It is determined whether or not the speed Vdset is exceeded (S4). As a result of this determination, when the exit side speed Vd exceeds the target exit side speed Vdset (Yes), the correction determination unit 18 then executes the process S7. On the other hand, as a result of the determination, when the exit side speed Vd does not exceed the target exit side speed Vdset, that is, when the exit side speed Vd is equal to or less than the target exit side speed Vdset (No) The determination unit 18 then executes the process S6.

In this process S6, the correction determination unit 18 opens the contact of the on / off switch 17, that is, turns off the on / off switch 17, and then executes the process S8. As a result, only the second control signal (second control command value, second tension control current value) is transmitted from the target tension setting unit 12 to the second tension reel motor drive unit 10 via the second addition unit 16. Entered. Therefore, the target tension set by the target tension setting unit 12 is not corrected, and the winding tension is set to the target tension received by the target tension setting unit 12 by the second tension reel motor drive unit 10. 2 The second tension reel motor 7 is driven and controlled according to the control signal.

On the other hand, in the process S7, the correction determination unit 18 closes the contact of the on / off switch 17, that is, turns on the on / off switch 17, and then executes the process S8. As a result, the addition result (second control signal) in which the second control signal from the target tension setting unit 12 and the correction signal from the changeover switch 17 are added to the second tension reel motor drive unit 10 by the second addition unit 16. + Correction signal (second control command value + correction value, second tension control current value + correction current value)) is input. Therefore, the target tension set by the target tension setting unit 12 is corrected so as to reduce the output side speed Vd of the rolled material WK, and the second tension reel motor is used to reduce the output side speed Vd of the rolled material WK. The second tension reel motor 7 is driven and controlled by the drive unit 10.

In the process S8, the correction determination unit 18 determines whether or not to continue the process. For example, if the rolled material WK is left unwound on the first tension reel 2 and it is necessary to continue the rolling process of the rolled material WK instead of the end of the pass, it is determined that the process is continued (Yes). The correction determination unit 18 returns the process to the process S1. On the other hand, for example, when the path ends, it is determined that the process is not continued (No), and the correction determination unit 18 ends the process.

The rolling system S operates in this way in order to suppress the occurrence of slip flaws. In one example, in the rolling system S, while the rolled material WK is being rolled by the speed control of the mill motor 8 and the tension control of the first and second tension reel motors 8 and 9, as shown in the upper part of FIG. When the output side speed Vd of the material WK changes with time, if the output side speed Vd exceeds the allowable upper limit speed VdL at time t1 for some reason, the correction determination unit 18 may perform the correction determination unit 18 in the above process S4. It is determined that the output speed Vd exceeds the allowable upper limit speed VdL, and the process S7 is executed. As a result, as shown in the lower part of FIG. 3, the contact of the on / off switch 17 is closed (the on / off switch 17 is turned on), the speed control of the second tension reel motor 7 is started, and the output side speed Vd of the rolled material WK is started. The target tension set by the target tension setting unit 12 is corrected so as to decelerate, and the second tension reel motor 7 is corrected by the second tension reel motor drive unit 10 so as to decelerate the output side speed Vd of the rolled material WK. Is driven and controlled. Therefore, as shown in the upper part of FIG. 3, the output speed Vd of the rolled material WK is reduced.

When the output side speed Vd becomes equal to or less than the allowable upper limit speed VdL at time t2, the correction determination unit 18 determines in the above process S4 that the output side speed Vd does not exceed the allowable upper limit speed VdL. Subsequently, in the above-mentioned process S5, the correction determination unit 18 determines that the output side speed Vd exceeds the target output side speed Vdset, and executes the process S7. Therefore, as shown in the lower part of FIG. 3, the on / off switch 17 is continuously closed (on), the speed control of the second tension reel motor 7 is continued, and as shown in the upper part of FIG. 3, the rolled material WK The exit speed Vd continues to be decelerated.

When the exit speed Vd becomes equal to or less than the target exit speed Vdset at time t3, the correction determination unit 18 determines in the above process S4 that the exit speed Vd does not exceed the allowable upper limit speed VdL. Subsequently, in the above-mentioned process S5, the correction determination unit 18 determines that the output side speed Vd does not exceed the target output side speed Vdset, and the correction determination unit 18 executes the process S6. As a result, as shown in the lower part of FIG. 3, the contact of the on / off switch 17 is opened (the on / off switch 17 is turned off), the speed control of the second tension reel motor 7 is completed, and the second tension reel motor drive unit 10 is completed. Only the second control signal is input from the target tension setting unit 12 via the second addition unit 16. Therefore, the rolled material WK is rolled again by the speed control of the mill motor 8 and the tension control of the first and second tension reel motors 8 and 9.

At time t4 to time t5, the rolling system S operates in the same manner as at time t1 to time t3.

In the rolling system S according to the present embodiment, the first and second tension reel motor drive units 9 and 10, the target tension setting unit 12, the first and second speedometers 13, 14, the first and the second The addition unit 15, 16, the changeover switch 17, the correction determination unit 18, the on / off switch 19, the target output side speed setting unit 20, the allowable upper limit speed setting unit 21, and the speed control correction value generation unit 22 are the speed control devices of the rolling mill. Corresponds to one example. The first and second tension reel motor drive units 9, 10 and the target tension setting unit 12 control the tension reel motor so that the take-up tension becomes the target tension by controlling the speed of the tension reel motor. It corresponds to an example of a 1-reel motor control unit. When the rolled material WK moves in the positive direction, the second addition unit 16, the changeover switch 17, the correction determination unit 18, the on / off switch 19, the target output side speed setting unit 20, the allowable upper limit speed setting unit 21, and the speed control correction value generation The unit 22 reduces the output speed of the rolled material when the output speed of the rolled material measured by the output speed measuring unit exceeds the allowable upper limit speed faster than the target speed. Corresponding to an example of the second reel motor control unit that controls the tension reel motor, when the rolled material WK moves in the opposite direction, the first addition unit 15, the changeover switch 17, the correction determination unit 18, the on / off switch 19, and the target output The side speed setting unit 20, the allowable upper limit speed setting unit 21, and the speed control correction value generation unit 22 correspond to another example of the second reel motor control unit.

As described above, the rolling system S in the present embodiment, the speed control device of the rolling mill incorporated therein, and the speed control method of the rolling mill mounted therein are the rolled materials measured by the output side speed measuring unit. Since the tension reel motor is controlled so as to decelerate the output side speed Vd of the rolled material WK when the output side speed Vd of the WK exceeds the allowable upper limit speed VdL faster than the target output side speed Vdset, the mill motor 8 Even if the speed is controlled at a constant target speed, the output side speed Vd of the rolled material WK can be suppressed to the allowable upper limit speed VdL or less, and the occurrence of slip flaws can be reduced.

The rolling system S, the speed control device of the rolling mill, and the speed control method of the rolling mill realize the deceleration of the output side speed Vd by correcting the target tension, so that the speed of the mill motor is controlled at a constant target speed and the tension is adjusted. A second tension reel control unit that controls the exit speed in order to reduce the occurrence of slip flaws can be added to the device that controls the tension of the reel with a constant target tension.

In the above-described embodiment, the target tension is corrected by one correction value by executing the process S7 once in the repetition of each of the above-mentioned processes shown in FIG. 2, and the process S7 is repeated to form a stepped shape. The target tension has been corrected, but the correction of the target tension is not limited to this. For example, a correction value may be generated by PI control targeting the target output speed Vdset, and the target tension may be corrected by the correction value by this PI control.

In order to express the present invention, the present invention has been appropriately and sufficiently described through embodiments with reference to the drawings above, but those skilled in the art can easily modify and / or improve the above embodiments. It should be recognized that it can be done. Therefore, unless the modified or improved form implemented by a person skilled in the art is at a level that deviates from the scope of rights of the claims stated in the claims, the modified form or the improved form is the scope of rights of the claims. It is interpreted as being included in.

S Rolling system WR (WR-1, WR-2) Work roll BR (BR-1, BR-2) Backup roll 1 Roller 2 1st tension reel 3 2nd tension reel 6 1st tension reel motor 7 2nd tension Reel motor 8 Mill motor 9 1st tension reel motor drive unit 10 2nd tension reel motor drive unit 11 Mill motor drive unit 12 Target tension setting unit 13 1st speed meter 14 2nd speed meter 15 1st addition unit 16 2nd addition unit 17 Changeover switch 18 Correction judgment unit 19 On / off switch 20 Target output side speed setting unit 21 Allowable tail upper limit speed setting unit 22 Speed control correction value generation unit

Claims (4)

A speed control device for a rolling mill that further controls the speed of the rolled material in a rolling mill that controls the speed of a mill motor that drives a pair of work rolls for rolling the rolled material at a constant target speed.
A tension reel that winds up the rolled material rolled by the work roll, and
A tension reel motor that drives the tension reel and
A first reel motor control unit that controls the tension reel motor so that the take-up tension becomes a target tension by controlling the speed of the tension reel motor.
An output speed measuring unit that measures the output speed of the rolled material,
When the discharge side speed of the rolled material measured by the discharge side speed measuring unit exceeds a preset allowable upper limit speed, the tension reel motor is operated so as to reduce the discharge side speed of the rolled material. A second reel motor control unit for controlling is provided.
Roller speed control device. The first reel motor control unit has a target tension setting unit that sets the target tension, and the winding tension becomes the target tension set in the target tension setting unit by controlling the speed of the tension reel motor. A control unit that controls the tension reel motor is provided.
The second reel motor control unit outputs the rolled material measured by the output speed measuring unit when the output speed of the rolled material measured by the output speed measuring unit exceeds the allowable upper limit speed. The target tension set by the target tension setting unit so as to reduce the exit side speed of the rolled material until the side speed becomes equal to or lower than a predetermined target exit speed slower than the allowable upper limit speed set in advance. To correct,
The speed control device for a rolling mill according to claim 1. A speed control method for a rolling mill that further controls the speed of the rolled material in a rolling mill that controls the speed of a mill motor that drives a pair of work rolls for rolling the rolled material at a constant target speed.
A drive process in which a tension reel motor is used to drive a tension reel that winds a rolled material rolled by the work roll.
The first reel motor control step of controlling the tension reel motor so that the take-up tension becomes the target tension by controlling the speed of the tension reel motor, and
The output speed measuring step for measuring the output speed of the rolled material, and
When the output side speed of the rolled material measured in the output side speed measuring step exceeds a preset allowable upper limit speed, the tension reel motor is operated so as to reduce the output side speed of the rolled material. It includes a second reel motor control process to control.
Rolling mill speed control method. A rolling system including a rolling mill that controls the speed of a mill motor that drives a pair of work rolls for rolling a rolled material at a constant target speed, and a speed control device for the rolling mill that further controls the speed of the rolled material.
The speed control device for the rolling mill is the speed control device for the rolling mill according to claim 1 or 2.
Rolling system.

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