JP5452575B2 - Control method of rolling mill - Google Patents

Description

  The present invention relates to a rolling mill, and more particularly to a control method for a rolling device that opens and closes work rolls.

  Conventionally, in a cold rolling mill, particularly in a continuous rolling mill in which a plurality of rolling mills called a tandem rolling mill are continuous, the material to be rolled is welded continuously at the entry side of the continuous rolling mill, and the material to be rolled (coil) is continuously formed. It is rolling. Here, since the rolled product has different steel types, plate thicknesses, plate widths, and the like for each coil, when the weld passes through the rolling mill, the rolling schedule is changed.

However, when the coil width, plate thickness, material, etc. of the coil currently rolled and the coil to be rolled next are significantly different, the material to be rolled may be broken at the welded portion. A method is employed in which the machine is temporarily stopped, the work roll is released from the coil, the welded portion of the coil is passed, and then the rolling operation is started again.
In addition, there exist the following patent documents 1 and 2 as literature well-known invention which concerns on this application.

JP 2004-34039 A JP 58-168410 A

  By the way, in the above-mentioned case, a stop mark of the work roll is generated in the material to be rolled at the place where the rolling mill is stopped, and the operation is resumed because the work roll is closed by passing the welded portion and the rolling operation is resumed. Thus, the material until the desired plate thickness is obtained becomes off-gauge and the yield decreases. In addition, the rolling mill is stopped, the work roll is released, the material to be rolled is sent out until the welded portion (welding point) passes, the work roll is closed again, and the operation is restarted, so that the operation efficiency is also lowered. .

For the work roll replacement work, the rolling mill must be stopped, so a stop mark is generated on the material to be rolled, and the yield of the product is reduced. At the same time, the work roll is stopped from the material to be rolled after the rolling mill is stopped. Since the operation cannot be performed until the work roll is opened, the work roll is replaced, and the work roll is closed to the material to be rolled, the rolling operation efficiency is lowered.
Thus, if the work roll can be released from the material to be rolled and brought into contact with the material to be rolled while continuing the rolling operation, it is not necessary to stop the rolling mill, and the yield and production efficiency are improved. In addition, the operability of the continuous rolling mill can be remarkably improved, such as changing work rolls (replacement) between runs and changing the number of stands used for rolling.

However, it is not easy to open and contact the work roll during the rolling operation, and various studies have been made so far, but there are few techniques that can be actually applied to the operation site.
The problem with opening and closing the work roll during rolling is that the rolling state becomes unstable during the process of opening and closing the work roll, the material to be rolled breaks, or the work roll is covered. For example, the work roll slips with the material to be rolled when released from and brought into contact with the rolled material, and the material to be rolled and the work roll are damaged.

Deforms when stress is applied to the metal strip such as the material to be rolled, but after applying the stress, the temporary deformation that returns to the original state is an elastic deformation, and after applying the stress, it remains permanently deformed. Such deformation is called plastic deformation. And the stress which generate | occur | produces when changing from an elastic deformation to a plastic deformation is called a yield point.
In the rolling state, the material to be rolled is plastically deformed by the tension before and after the work roll and the load applied by the work roll, and the thickness on the exit side of the rolling mill is thinner than the thickness on the entrance side of the rolling mill. It has become. The difference in sheet thickness between the entrance and exit side of the rolling mill is called the reduction amount.

When the work roll load is reduced, the reduction amount decreases, but when the load becomes smaller than the yield point, the reduction amount becomes zero or extremely small when the plastic deformation is changed to the elastic deformation. At this time, the speed of the material to be rolled on the entry side of the rolling mill is increased, the speed of the material to be rolled on the exit side of the rolling mill is decreased, and the tension on the entry side and the exit side of the rolling mill are rapidly increased.
Further, when the load of the work roll is increased from the state of elastic deformation, the yield point is exceeded at a certain point, and the state is shifted to the plastic deformation state.

At this time, since the amount of reduction increases rapidly, the speed of the material to be rolled on the rolling mill entry side decreases, and the speed of the material to be rolled on the rolling mill exit side increases, so that the tension on the entry side and the exit side of the rolling mill increases. Decreases rapidly.
When the tension of the material to be rolled fluctuates abruptly at a normal rolling speed, rolling becomes unstable, a shape defect called squeezing occurs, or the tension at the end of the plate rises. It breaks.
Also, when the work roll is separated from the material to be rolled, the speed of the work roll changes because the torque of the motor that drives the work roll fluctuates, and the speed of the material to be rolled changes, The work roll slips. On the other hand, when the work roll is brought into contact with the material to be rolled, the work roll and the material to be rolled slip due to a difference in speed between the work roll and the material to be rolled.

That is, when the work roll is opened and closed during running (while the material to be rolled is running), a difference occurs between the speed of the work roll and the material to be rolled, so that slip and scratches occur.
In addition, when the work roll is opened and closed, the material to be rolled rapidly changes from plastic deformation to elastic deformation, or from elastic deformation to plastic deformation. Causes drawing and plate breakage.

Therefore, a person skilled in the art is demanding a method and an apparatus that can open and close the work roll without minimizing the amount of variation in tension and causing slippage between the material to be rolled and the work roll.
Therefore, it is a technical problem that the work roll can be opened and closed without causing damage to the rolled material and the work roll.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control method for a rolling device that can open and close a work roll without causing slip and scratches on the material to be rolled and the work roll.

In order to achieve the above object, the control method of the rolling apparatus according to the first aspect of the present invention controls the upper and lower work rolls that roll and roll the material being rolled from above and below, and the gap between the upper and lower work rolls. A rolling device control method comprising one or more rolling mills having a roll gap control device that performs a reduction of the rolling material in a rolled state from a rolling speed, and the speed of the rolling material. A first step of reducing the load applied to the rolled material by the upper and lower work rolls while decelerating the rolled material from a predetermined speed greater than 30 meters / minute to a speed of less than 30 meters / minute ; A second step of keeping the load constant in a state where the material to be rolled reaches an elastically deformed state, and at least a tension and a plate speed of the material to be rolled on the entry side and the exit side of the rolling mill of And a third step of releasing the work roll from the closed state of the work roll with respect to the material to be rolled using the roll gap control device. It is out.

The control method of the rolling apparatus according to the second aspect of the present invention includes an upper and lower work roll that rolls down the rolling material being rolled from above and below, and a roll gap control apparatus that controls the gap between the upper and lower work rolls. A method for controlling a rolling device comprising one or more rolling mills, wherein the control device does not stop the material to be rolled, and the material to be rolled on the work roll at a speed of less than 30 meters / minute. A first step of closing the rolled material from the open state and holding the rolled material in an elastically deformed state, and the retained elastically deformed state, the rolling mill The rolled material is stopped using the roll gap control device in a state that at least part of at least one of the tension and the plate speed of the rolled material on the entry side and the exit side is equal. Without the second work step of closing the work roll from the open state with respect to the work material, the upper and lower work rolls without stopping the work material The third step of increasing the load applied to the material to be rolled, when the load reaches the target load for rolling, and the tensions on the rolling mill entry and exit sides of the material to be rolled reach set values. And the seventh step of starting acceleration of the upper and lower work rolls and shifting to a normal rolling state .

The control method of the rolling apparatus according to the third aspect of the present invention includes upper and lower work rolls for rolling and rolling the material to be rolled from above and below, a roll gap control apparatus for controlling a gap between the upper and lower work rolls, A rolling apparatus control method comprising one or more rolling mills having means for applying a bending force to the work roll, wherein the control apparatus reduces the speed of the rolled material in a rolled state from the rolling speed. A first step of slowing down from a predetermined speed greater than less than 30 meters / minute to a speed less than 30 meters / minute from a deceleration rate up to the predetermined speed, and the speed of the material to be rolled is 30 meters / after being decelerated to a rate of less than min, the without stopping the material to be rolled, and gradually the vendor force with gradually decreasing the load which the upper and lower work rolls is added to the material to be rolled A second step to reduce, a third step to increase the bender force of the upper and lower work rolls, and to adjust so that the work rolls existing above and below the material to be rolled do not slip, and into the rolling mill In the state in which the tension results of the rolled material on the side and the outlet side are equal, or the difference is within a certain value range, the rolled material of the work roll is applied to the rolled material using the roll gap control device. And a fourth step of releasing the material to be rolled from the closed state in a non-contact state .

The control method of the rolling apparatus according to the fourth aspect of the present invention includes upper and lower work rolls for rolling and rolling the material to be rolled from above and below, a roll gap control apparatus for controlling a gap between the upper and lower work rolls, A rolling device control method comprising one or more rolling mills having a means for applying a bending force to the work roll, wherein the control device has a speed of less than 30 meters / minute without stopping the material to be rolled. In the state where the speed difference between the upper and lower work rolls and the material to be rolled is zero or within a certain range, the roll gap control device is used to make no contact with the material to be rolled of the work rolls. Bending force required at the time of rolling from the stage of reducing the bending force of the upper and lower work rolls in synchronism with the first step of closing the rolled material from the open state and the first step The second step of providing the state, and gradually increasing the load applied by the upper and lower work rolls to the material to be rolled without stopping the material to be rolled after performing the confinement and the bending force The speed of the material to be rolled when the load reaches the target load for rolling and the tensions on the entry side and the exit side of the material to be rolled reach the set values. And a fourth step of increasing the speed to a predetermined speed.

The control method of the rolling apparatus according to the fifth aspect of the present invention includes upper and lower work rolls for rolling and rolling a material to be rolled from above and below, a roll gap control apparatus for controlling a gap between the upper and lower work rolls, A rolling apparatus control method comprising one or more rolling mills having means for applying a bending force to the work roll, wherein the control apparatus decelerates the rolled material in a rolled state from a rolling speed, The speed of the material to be rolled is reduced from the predetermined speed greater than less than 30 meters / minute to the speed of less than 30 meters / minute so that the load applied to the material to be rolled does not become a constant value or more than a certain value. a first step you to the after being decelerated to the speed of the speed is below the 30 m / min the rolled material, wherein without stopping the material to be rolled, the upper and lower work rolls are the material to be rolled A second step of gradually reducing the applied load and gradually reducing the bender force; releasing the bender force between the upper and lower work rolls; and slipping between the work rolls existing above and below the material to be rolled. The roll gap control is performed in a state in which the third step of adjusting so as not to be performed and the actual tension of the material to be rolled on the entry side and the exit side of the rolling mill are equal or within a certain value range. Using the apparatus, the lower work roll is moved downward and released from the material to be rolled, and when the rolling load is reduced to a certain value or less, the upper work roll is moved up to raise and lower the upper and lower work rolls. A fourth step of releasing the work roll from a closed state with respect to the material to be rolled, which is brought into a non-contact state with respect to the material to be rolled.

The control method of the rolling apparatus according to the sixth aspect of the present invention includes upper and lower work rolls for rolling and rolling the material to be rolled from above and below, a roll gap control apparatus for controlling the gap between the upper and lower work rolls, A rolling device control method comprising one or more rolling mills having a means for applying a bending force to the work roll, wherein the control device has a speed of less than 30 meters / minute without stopping the material to be rolled. In the state where the speed difference between the upper and lower work rolls and the material to be rolled is zero or within a certain range, the roll gap control device is used to make no contact with the material to be rolled of the work rolls. In synchronism with the first step of closing the rolled material from the open state and the first step, the bender force is released between the upper and lower work rolls and exists above and below the rolled material. Each said From the stage of adjusting so as not to slip between work rolls, the second step to give the bender force required at the time of rolling, and after the closing, without stopping the material to be rolled, A third step of gradually increasing the load applied to the material to be rolled by the upper and lower work rolls and gradually increasing the bender force; the load reaches a target load for rolling; When the tension on the side and outlet reaches the set value, acceleration of the upper and lower work rolls is started, and after reaching a certain speed, the acceleration rate is increased to further accelerate to normal rolling state And a fourth step of increasing the speed.

  ADVANTAGE OF THE INVENTION According to this invention, the control method of the rolling apparatus which can open | release and close a work roll is realizable, without generating a slip and a damage | wound to a material to be rolled and a work roll.

It is a conceptual diagram which shows the rolling apparatus S of the single stand of the simple structural example of the rolling roll open | release and closing system of embodiment which concerns on this invention. (a) is a figure which shows the rolling mill speed | rate which is the speed of the work roll by the electric motor of the rolling mill at the time of releasing operation | movement from the to-be-rolled material of the work roll of running (while the to-be-rolled material 1 is running), (b) is a figure which shows the rolling load with respect to the to-be-rolled material during a run, and the vendor pressure of a work roll, (c) is a figure which shows the tension | tensile_strength results of the rolling mill entrance side and exit side during a run, d) is a figure which shows the speed | velocity result of the to-be-rolled material of the rolling mill entrance side and exit side during a run. It is a figure which shows the example of the operation | movement flow of opening | release from the to-be-rolled material of the work roll between runs. (a) is a diagram showing the rolling mill speed of the work roll speed by the electric motor of the rolling mill during the operation of closing the upper and lower work rolls to the rolled material during running of the rolled material, (b) is a figure which shows the rolling load with respect to the to-be-rolled material during a run, and the vendor pressure of a work roll, (c) is a figure which shows the tension | tensile_strength results of the rolling mill entrance side and exit side during a run, d) is a figure which shows the speed | velocity result of the to-be-rolled material of the rolling mill entrance side and exit side during a run. It is a figure which shows the operation | movement flow at the time of closing an upper and lower work roll to a to-be-rolled material between running (during to-be-rolled material driving | running | working).

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a conceptual diagram showing a single-stand rolling apparatus S of a simple configuration example of a running roll opening and closing system according to an embodiment of the present invention.

<< Overview of Rolling Apparatus S >>
The rolling device S of the embodiment according to the present invention is capable of being covered during low-speed operation of 60 mpm (meters / minute) or less when the welded portion of the material to be rolled 1 passes through the upper and lower work rolls Rs1 and Rs2 responsible for rolling. The work rolls Rs1, Rs2 are separated from the rolled material 1 according to a predetermined procedure, and it is determined whether the rolled material 1 has reached the elastically deformed state from the plastically deformed state, and the upper and lower work rolls Rs1, Rs2 and the rolled material 1 is in a non-contact state. Thereafter, the upper and lower work rolls Rs1, Rs2 are brought into contact with the material to be rolled 1 while the material to be rolled 1 is operating at a low speed of 60 mpm or less, and it is determined whether the material 1 has been changed from an elastically deformed state to a plastically deformed state. The upper and lower work rolls Rs1 and Rs2 are opened and closed during the rolling operation by making a transition to the rolling state step by step according to a predetermined procedure.

  In this way, the upper / lower work rolls Rs1, Rs2 and the material to be rolled 1 are determined at a low speed of 60 mpm or less to determine whether the material to be rolled 1 is in a plastically deformed state or an elastically deformed state, and in accordance with a predetermined procedure, In particular, the upper and lower work rolls Rs1 and Rs2 are separated from the material to be rolled 1, and the material to be rolled 1 and the upper and lower work rolls Rs1 and Rs2 are damaged in order to contact the material to be rolled 1. The upper and lower work rolls Rs1, Rs2 can be opened from the material to be rolled 1 and can be closed to the material to be rolled 1.

Moreover, the slip between the upper and lower work rolls Rs1, Rs2 and the material 1 to be rolled can be prevented, and the rolling state can be more stably changed.
Specifically, by changing the acceleration / deceleration rate of the line, the tension of the material 1 to be rolled, and the rolling load stepwise so that the material 1 to be rolled smoothly moves to a low speed state of 60 mpm or less. The rolled material 1 can smoothly transition from the plastically deformed state to the elastically deformed state, and the rolled material 1 can smoothly transition from the elastically deformed state to the plastically deformed state.
The rolling state of the elastic material and plastic deformation of the material 1 to be rolled depends on the actual value of the tensile value on the entry side or the exit side of the rolling mill 3 or the result of the speed ratio of the material 1 to be rolled on the entry side and the exit side of the rolling mill. Can be detected.

Hereinafter, the rolling apparatus S will be described in detail.
<< Overall Configuration of Rolling Apparatus S >>
The rolling device S feeds the rolled material 1 toward the rolling mill 3 on the entry side of the rolled material 1 of the rolling mill 3 that performs rolling on the rolled material 1 and controls the speed of the entry side speed control. A roll 2 is installed, and a tension reel 4 for winding the rolled material 1 as a coil 5 is installed on the exit side of the rolled material 1 of the rolling mill 3.
The entry side speed control roll 2 may be any mechanism that can control the speed of the material 1 to be rolled, such as a pinch roll that sandwiches the material 1 to be rolled, or an unwinding reel with a speed control function. Alternatively, a form in which the take-up reel has a speed control function may be used.

On the entry side of the material to be rolled 1 of the rolling mill 3, a rolling mill entry side tension detector 9 that detects the tension of the material to be rolled 1 on the entry side of the rolling mill 3, and a material to be rolled on the entry side of the rolling mill 3. A rolling mill entry side speed detector 6 that detects the speed of 1 is installed.
Further, on the exit side of the material to be rolled 1 of the rolling mill 3, a rolling mill exit side tension detector 10 that detects the tension of the material to be rolled 1 on the exit side of the rolling mill 3, and an exit side of the rolling material 3. A rolling mill exit side speed detector 7 for detecting the speed of the rolled material 1 is installed.

The rolling mill entry side / exit side speed detectors 6 and 7 are, for example, devices that apply a laser beam slightly obliquely to the material 1 to be rolled and read the speed change from a change in wavelength with the incident light of the reflected light. Is used.
The rolling mill entry side / exit side tension detectors 9 and 10 apply, for example, rolls 9r and 10r to the material 1 to be rolled, and the tension of the material 1 to be rolled from the load applied from the material 1 to the rolls 9r and 10r. A device or the like for reading is used. Of course, the rolling mill entry / exit speed detectors 6 and 7 and the rolling mill entry / exit tension detectors 9 and 10 are not limited to the above configuration.

The rolling mill 3 is provided with an upper roll position control device 51 and a lower roll position control device 52 independently from each other in the vertical direction, and the upper work roll Rs1 is provided by the upper roll position control device 51 and the lower roll position control device 52. The height position of the lower work roll Rs2 can be operated independently.
The upper roll position control device 51 and the lower roll position control device 52 are independently controlled by the control command of the roll position command calculation device 61, respectively.

  In addition, a load detector 8 for detecting a load applied to the upper part of the lower work roll Rs2 or the lower part of the upper work roll Rs1 is provided, and the material to be rolled by the upper and lower work rolls Rs1 and Rs2 by the load detector 8. The rolling load applied to 1 is measured.

  The tension / speed command calculating device 62 outputs the speed command of the electric motor 20 to the speed control device 40 of the entry-side speed control roll 2 that feeds out the material 1 to be rolled, and the motor 21 to the speed control device 41 of the rolling mill 3. Outputs speed command. Each speed control device 40, 41 detects the rotational speed of each electric motor 20, 21 by the speed detector 30, 31 of each electric motor 20, 21, and each electric motor 20, 21 is a tension / speed command calculation device 62. Control to rotate at the speed command calculated in.

  The current command calculation device 63 includes a tension target value of the tension reel 4 that applies tension to the material 1 to be rolled on the exit side of the rolling mill 3, and the diameter, tension, and tension of the coil 5 around which the rolled material 1 is wound. A current command of the tension reel drive motor 22 for obtaining a desired tension is calculated from the speed command of the speed command calculation device 62. Then, the current control device 42 to which the current command calculated by the current command calculation device 63 is input is tension reel drive so that the current of the tension reel drive motor 22 is equal to the current command calculated by the current command calculation device 63. The electric motor 22 is controlled.

In a normal rolling state, the tension of the material to be rolled 1 on the entry side of the rolling mill 3 is controlled by increasing or decreasing the speed of the material to be rolled 1 by the entry side speed control roll 2. After being rolled to a desired thickness by 3, it is wound on a tension reel 4.
The running roll opening / closing command computing device 60 is a computing device that controls the rolling device S in an integrated manner, and the upper and lower work rolls Rs1, Rs2 of running (rolled material 1 is running) described later. Control of opening and closing from the material 1 to be rolled is performed in an integrated manner.

That is, the running roll opening / closing command calculating device 60 outputs a roll closing command to a roll position command calculating device 61 that controls the upper / lower roll position control devices 51, 52, and also a tension / speed command calculating device. The speed command of the material 1 to be rolled to the speed control devices 40 and 41 for 62, the tension command of the material 1 to be rolled of the current command calculation device 63 on the exit side, and the like are output.
Here, the running roll opening / closing command computing device 60, the roll position command computing device 61, the tension / speed command computing device 62, and the current command computing device 63 are, for example, control software in a PLC (programmable logic controller). Is embodied by. Further, the speed control devices 40 and 41, the current control device 42, and the upper / lower roll position control devices 51 and 52 are embodied by control software, electronic circuits, or the like in a PLC, for example.

<Opening operation of the upper and lower work rolls Rs1, Rs2 from the material to be rolled 1>
Next, the operation of releasing the work rolls Rs1, Rs2 from the material to be rolled 1 during running (while the material to be rolled 1 is running) will be described with reference to FIGS.
FIG. 2 (a) shows the up / down direction by the electric motor 21 of the rolling mill 3 during the opening operation of the upper / lower work rolls Rs1, Rs2 from the rolled material 1 during running (while the rolled material 1 is running). It is a figure which shows the rolling mill speed which is the speed | rate of work roll Rs1, Rs2, FIG.2 (b) is a rolling load with respect to the to-be-rolled material 1 of a run (while the to-be-rolled material 1 is running), upper and lower work rolls. It is a figure which shows the vendor pressure of Rs1, Rs2, and FIG.2 (c) shows the tension | tensile_strength performance of the rolling material 1 of the entrance side of the rolling mill 3 of a running (running | working material 1 is running), and the exit side. FIG. 2 (d) is a diagram showing the speed results of the material 1 on the entry side and the exit side of the rolling mill 3 during the run (while the material 1 is traveling).
FIG. 3 is a diagram showing an example of an operation flow for releasing the upper and lower work rolls Rs1, Rs2 from the material to be rolled 1 during running (during the material to be rolled 1).

When opening the upper and lower work rolls Rs1 and Rs2 during the run (during traveling of the material to be rolled 1), first, in S101 of FIG. 3, the upper and lower work rolls Rs1, Rs2 is decelerated (see (1) in FIG. 2A), and in S102 in FIG. 3, it is determined whether or not the mill speed is in a low speed region (30 to 50 mpm).
When the mill speed is not in the low speed region (30 to 50 mpm) (No in S102 in FIG. 3), the process proceeds to S101 in FIG. 3, and the work rolls Rs1 and Rs2 of the rolling mill (mill) are decelerated.
On the other hand, when the mill speed reaches the low speed region (30 to 50 mpm) (Yes in S102 in FIG. 3), the deceleration rate of the rolling mill 3 is changed in S103a in FIG. 3 ((2) in FIG. 2 (a). (Refer to Fig.1), and slowly decelerate to an extremely low speed state (less than 30 mpm).

In this embodiment, in order to minimize the operational off-gauge, the vehicle is decelerated to an extremely low speed, but there is no problem as long as the speed is lower than 60 mpm. Further, the method of changing the deceleration rate may be one step, or may be multi-step or stepless depending on the speed and time, and the speed of the rolling mill 3 and the material 1 to be rolled on the entry side and the exit side of the rolling mill 3 may be used. Any speed command may be used as long as the speed and tension are stable and the transition to an extremely low speed state is possible.
When the mill speed is low, if the sheet thickness of the material 1 to be rolled is kept constant, the load applied to the material 1 may increase, so in S103b of FIG. The lower roll position control device 51 is operated so that the constant or load does not exceed a certain value (see (3) in FIG. 2B).

In S104 of FIG. 3, it is determined whether or not the mill speed (speed of the rolling mill 3) has become an extremely low speed state. When the mill speed (speed of the rolling mill 3) does not become an extremely low speed state (No in S104 in FIG. 3), the process proceeds to S103a and S103b in FIG.
When the mill speed (speed of the rolling mill 3) becomes extremely low (Yes in S104 of FIG. 3), the mill speed (speed of the rolling mill 3) is controlled to be constant in S105 of FIG. In S106a, the load target value is changed or the lower roll position control device is operated to operate the lower roll position downward to reduce the rolling load applied to the material 1 (see (4) in FIG. 2B). ). At the same time, the vendor pressures of the upper work roll Rs1 and the lower work roll Rs2 are also reduced in S106b of FIG. 3 (see (5a) of FIG. 2B).

Further, in S106c of FIG. 3, the tension target value is changed so that the tension on the entry side and the exit side of the rolling mill 3 is the same (see (5b) in FIG. 2C).
Note that the vendor pressure of the upper work roll Rs1 and the lower work roll Rs2 is the bending of the upper work roll Rs1 and the lower work roll Rs2 (the center part is deformed outward because the material 1 is sandwiched in the center part). In order to suppress the bending of the both end portions being deformed inward, the pressure is applied outwardly to both end portions of the upper work roll Rs1 and the lower work roll Rs2.

  In S107 of FIG. 3, whether or not a large tension fluctuation has been detected in the material 1 to be rolled on the entry side or the exit side of the rolling mill 3 (see (6a) in FIG. 2C), or the entry side of the rolling mill 3 And whether the difference between the actual speeds on the delivery side is within a certain range (less than 1%) (or whether the speed ratio on the entry side and the exit side of the rolling mill 3 is 1 or a value close to 1) ) (See (6b) in FIG. 2 (d)) or whether the rolling load on the material 1 to be rolled has reached the lower limit (see (6c) in FIG. 2 (b)).

  In S107 of FIG. 3, a large tension fluctuation is not detected in the material to be rolled 1 on the entry side or the exit side of the rolling mill 3, and within a certain range in which there is a difference in speed results between the entry side and the exit side of the rolling mill 3. (Or less than 1%) (or the speed ratio on the entry side and the exit side of the rolling mill 3 does not become a value close to 1) and the rolling load does not become the lower limit value (No in S107 in FIG. 3). The process proceeds to S106a, S106b, and S106c in FIG.

  On the other hand, in S107 of FIG. 3, a large tension fluctuation on the entry side or the exit side is detected, or the difference in speed performance between the entry side and the exit side of the rolling mill 3 is within a certain range (less than 1%) (or rolling If it is determined that the speed ratio between the entry side and the exit side of the machine 3 is a value close to 1), or the rolling load has reached the lower limit (Yes in S107 in FIG. 3), the material 1 to be rolled changes from plastic deformation to elastic deformation. In S108a of FIG. 3, the lower roll position control device 52 is operated to control the rolling load to the material 1 to be rolled constant (see (7a) in FIG. 2B). In step S108b, the bender pressures of the upper and lower work rolls Rs1 and Rs2 are set to balance pressures (bender pressure and upper -Lower work roll R The weight is increased until the weights of s1 and Rs2 are balanced (see (7b) in FIG. 2B).

Subsequently, in S109 of FIG. 3, the vendor pressure results of the upper and lower work rolls Rs1, Rs2 rise above the balance pressure, and the tension results on the entry side and the exit side of the rolling mill 3 are equal or constant. It is determined whether or not the value is within the range (see (8) in FIG. 2C).
In S109 of FIG. 3, the vendor pressure results of the upper and lower work rolls Rs1, Rs2 do not increase above the balance pressure, or the tension results of the material 1 to be rolled on the entry side and the exit side of the rolling mill 3 are equal or different. If it is determined that the value is not within a certain range (No in S109 in FIG. 3), the process proceeds to S108a and S108b in FIG.

On the other hand, the vendor pressure record of the work rolls Rs1 and Rs2 rises above the balance pressure, and the tension record of the material to be rolled 1 on the entry side and the exit side of the rolling mill 3 is equal, or the difference is within a certain value range. 3 (Yes in S109 in FIG. 3), in S110a in FIG. 3, the lower roll position controller 52 is operated to move the lower work roll Rs2 downward and release it from the material 1 to be rolled (FIG. 3). 2 (b) (9)).
At the same time, when the rolling load decreases below a certain value in S110b of FIG. 3, the upper roll position control device 51 is operated to raise the position of the upper work roll Rs1 (see (9) of FIG. 2B). .

Subsequently, in S111 of FIG. 3, it is determined whether or not the lower work roll Rs2 has reached a position equal to or greater than a predetermined value Xmm from the pass line position where the material 1 is conveyed. For example, when the plate thickness of the material 1 to be rolled is 3 mm, Xmm can be set to 2 mm. X should just be a value which the to-be-rolled material 1 and lower work roll Rs2 do not contact.
When it is determined that the lower work roll Rs2 does not reach a position equal to or greater than the predetermined value Xmm from the pass line position where the material 1 is conveyed (No in S111 in FIG. 3), the process proceeds to S110a in FIG.

On the other hand, when it is determined in S111 in FIG. 3 that the lower work roll Rs2 has reached a position of a predetermined value Xmm or more from the pass line position where the material 1 is conveyed (Yes in S111 in FIG. 3), the process is finished. (Refer to (10) in FIG. 2B).
Further, in S112 of FIG. 3, it is determined whether or not the position of the upper work roll Rs1 has reached a position equal to or greater than a predetermined value Xmm from the pass line position where the material to be rolled 1 is conveyed. In addition, X should just be a value which the to-be-rolled material 1 and the upper work roll Rs1 do not contact.

When it is determined that the position of the upper work roll Rs1 has not reached the position of X mm or more from the pass line (No in S112 in FIG. 3), the process proceeds to S110b in FIG.
On the other hand, when it is determined that the position of the upper work roll Rs1 has reached a position of X mm or more from the pass line (Yes in S112 in FIG. 3), the process is finished (see (10) in FIG. 2B).
The above is the operation flow for releasing the upper and lower work rolls Rs1, Rs2 from the material to be rolled 1 during the running (while the material to be rolled 1 is running) shown in FIG.

<< Operation when closing the upper and lower work rolls Rs1, Rs2 to the material to be rolled 1 during running >>
Next, the operation of closing the upper and lower work rolls Rs1, Rs2 to the material to be rolled 1 while the rolling device S is running (while the material to be rolled 1 is running) will be described with reference to FIG.

FIG. 4 is an operation chart when the upper and lower work rolls Rs1, Rs2 are closed to the rolled material 1 during running (while the rolled material 1 is running) in a low speed state where the rolled material 1 is 60 mpm or less. FIG. 4A shows the electric motor 21 of the rolling mill 3 during the closing operation of the upper and lower work rolls Rs1, Rs2 to the material to be rolled 1 during running (during the material to be rolled 1). It is a figure which shows the rolling mill speed which is the speed of upper / lower work roll Rs1, Rs2, and FIG.4 (b) is a rolling load with respect to the to-be-rolled material 1 of running (running to-be-rolled material 1), upper and lower FIG. 4 (c) is a diagram showing the tension results on the entry side and the exit side of the rolling mill 3 during the run (during running of the material to be rolled 1), FIG.4 (d) is a figure which shows the speed | velocity result of the to-be-rolled material 1 of the entrance side of the rolling mill 3 of driving | running | working (during to-be-rolled material 1 driving | running | working).
FIG. 5 is a diagram showing an operation flow when the upper work roll Rs1 and the lower work roll Rs2 are closed to the roll 1 while the roll 1 is running (running).

  When the upper work roll Rs1 and the lower work roll Rs2 are closed to the material to be rolled 1 during running (during the material to be rolled 1), first, the material to be rolled 1 shown in FIG. While traveling at a low speed of 60 mpm or less, the motor 21 starts the operation of the upper and lower work rolls Rs1, Rs2 of the mill (rolling machine 3), and the rolling mill speed (the rotation speed of the upper work roll Rs1, the lower work roll Rs2). However, when it is faster than the low-speed rolled material 1 of 60 mpm or less, the rolling mill 3 (upper work roll Rs1, lower work roll Rs2) is decelerated, and the peripheral speed of the upper and lower work rolls Rs1, Rs2 of the rolling mill 3 is reduced. The speed command to the electric motor 21 of the speed control device 41 is adjusted so that the speed of the material 1 to be rolled is the same (see (1) in FIG. 4A).

In S202 of FIG. 5, it is determined whether or not the speed difference between the rolling mill 3 (upper work roll Rs1, lower work roll Rs2) and the material to be rolled 1 is zero or within a certain range.
When it is determined that the speed difference between the rolling mill 3 (upper work roll Rs1, lower work roll Rs2) and the material 1 to be rolled is zero or not within a certain range (No in S202 of FIG. 5), S201 of FIG. Migrate to

  On the other hand, when it is determined that the speed difference between the rolling mill 3 (upper work roll Rs1, lower work roll Rs2) and the material 1 to be rolled is zero or within a certain range (Yes in S202 in FIG. 5), S203a in FIG. , S203b, the running roll opening / closing command calculating device 60 shown in FIG. 1 outputs a roll closing command to the roll position command calculating device 61, and the roll position command calculating device 61 receives the upper roll position control device 51 and A command for the closing direction is output to the lower roll position control device 52, and the material 1 to be rolled is closed by the upper and lower work rolls Rs1, Rs2 (see (2) in FIG. 4B).

In S204 of FIG. 5, the rolling load of the material 1 to be rolled is detected by the load detector 8 (see FIG. 1), and it is determined whether or not the rolling load has become a certain value or more.
When the rolling load is not equal to or greater than a certain value (No in S204 in FIG. 5), the process proceeds to S203a and S203b in FIG.
On the other hand, when the rolling load becomes a certain value or more (Yes in S204 in FIG. 5), in S205 in FIG. 5, the roll position command calculation device 61 (see FIG. 1) sets the lower roll so that the rolling load becomes constant. A position command is output to the position control device 52 to perform constant load control (see (3) in FIG. 4B).

Subsequently, in S206 of FIG. 5, the vendor pressure of the upper and lower work rolls Rs1, Rs2 is decreased from the balance pressure (see (4) of FIG. 4B).
In S207 of FIG. 5, it is determined whether or not the reduction of the vendor pressure of the upper and lower work rolls Rs1, Rs2 from the balance pressure has been completed.
If it is determined in S207 of FIG. 5 that the decrease in the vendor pressure from the balance pressure of the upper and lower work rolls Rs1 and Rs2 is not completed (No in S207 of FIG. 5), the process proceeds to S206 of FIG.

  On the other hand, when the reduction of the vendor pressure of the upper and lower work rolls Rs1 and Rs2 from the balance pressure is completed (Yes in S207 in FIG. 5), in the step S208a in FIG. 1), the roll position command control device 61 outputs a closing command to the lower roll position control device 52, and the lower work roll Rs2 closes the material 1 to be rolled by the command of the lower roll position control device 52. The load on the rolled material 1 is increased (see (5) in FIG. 4 (b)), and at the same time, in S208b in FIG. 5, the upper and lower work rolls Rs1, Rs2 to minimize the shape change of the material 1 to be rolled. The vendor pressure is increased with the above load (see (6) of FIG. 4B). Further, in S208c of FIG. 5, the running roll opening / closing command calculation device 60 performs the tension command to the speed control devices 40, 41 on the entry side of the rolling mill 3 of the tension / speed command calculation device 62 and the exit side. The tension command to the current command calculation device 63 is changed to the rolling schedule set value (see (7) in FIG. 4C).

  At the stage of increasing the rolling load on the material 1 to be rolled, the material 1 to be rolled shifts from an elastically deformed state to a plastically deformed state. The transition of this state is that the actual tension value detected by the rolling mill entry side tension detector 9 or the rolling mill exit side tension detector 10 of the rolling mill 3 shown in FIG. 1 decreases, or A speed difference appears in the sheet speed results of the material 1 to be rolled detected by the rolling mill entry speed detector 6 on the entry side of the rolling mill 3 and the exit speed detector 7 on the exit side (or This can be detected from the fact that the speed ratio between the entry side and the exit side of the rolled material 1 is not 1.

In S209 of FIG. 5, it is determined whether or not the rolling load has reached the target load and the tension change of the running roll opening / closing command calculating device 60 has been completed.
When the rolling load on the material 1 to be rolled does not reach the target load or the tension change of the running roll opening / closing command calculating device 60 is not completed (No in S209 in FIG. 5), The process proceeds to S208a in FIG. 5, S208b in FIG. 5, and S208c in FIG.
On the other hand, when the rolling load reaches the target load and the tension change of the running roll opening / closing command calculating device 60 is completed (Yes in S209 in FIG. 5), in S210 in FIG. The acceleration of the rolling mill 3 is started from a state where the acceleration rate is lowered (see (8) in FIG. 4A).

Subsequently, in S211 of FIG. 5, it is determined whether or not the speed of the rolling mill 3 (upper work roll Rs1, lower work roll Rs2) has reached a certain speed or higher.
If the speed of the rolling mill 3 (upper work roll Rs1, lower work roll Rs2) does not reach a certain speed (No in S211 in FIG. 5), the process proceeds to S210 in FIG.
On the other hand, when the speed of the rolling mill 3 reaches a certain speed (Yes in S211 in FIG. 5), in S212 in FIG. 5, the acceleration rate is returned to the normal acceleration rate and further accelerated (FIG. 4 ( a) (Refer to (9)), transition to the normal rolling state (refer to (10) in FIG. 4A).

Here, the change of the acceleration rate may be changed in multiple stages depending on the speed of the rolling mill 3 (rotational speed of the upper work roll Rs1, the lower work roll Rs2) or time, even in one stage where the acceleration rate is changed only once. May be continuously changed steplessly.
The above is the flow of the operation of closing the upper and lower work rolls Rs1, Rs2 to the material 1 to be rolled while the rolling device S shown in FIG. 5 is running (while the material 1 is being rolled).

<< Summary >>
In the rolling apparatus S (see FIG. 1) of the present embodiment, each state is changed in stages from rolling of the material to be rolled 1 to opening of the upper and lower work rolls Rs1, Rs2, and the running distance (rolled material) 1), the upper and lower work rolls Rs1, Rs2 are released from the material to be rolled 1 and closed to the material 1 to be rolled. Further, by performing these operations when the material to be rolled 1 is fed at 60 mpm or less, the off-gauge of the product (rolled product) is minimized, and the upper and lower work rolls Rs1, Rs2 and the material to be rolled 1 are damaged. The upper and lower work rolls Rs1 and Rs2 can be opened and closed without generating.

When the upper and lower work rolls Rs1 and Rs2 are opened in the rolling apparatus S, first, the normal rolling state is decelerated to obtain a rolling state at a low speed.
At this time, since the speed is reduced while maintaining a stable rolling state, the speed may be reduced stepwise.
If the material to be rolled 1 is fed at an extremely low speed of less than 30 mpm, the upper and lower work rolls Rs1, Rs2 can be opened and closed more safely. When the material to be rolled 1 is decelerated from a rolling state at a low speed (30 mpm or more) to an extremely low speed (less than 30 mpm), if the decelerating rate is large, that is, decelerating quickly, the upper and lower work rolls of the rolling mill 3 Since Rs1 and Rs2 stop, the speed command deceleration rate of the upper and lower work rolls Rs1 and Rs2 of the rolling mill 3 is changed stepwise to decelerate gently.

Further, when the gap between the upper and lower work rolls Rs1, Rs2 is controlled so that the plate thickness of the material 1 to be rolled becomes a target value at a low speed, the material to be rolled 1 of the upper and lower work rolls Rs1, Rs2 is obtained. Load increases, and the plate shape of the material 1 to be rolled deteriorates.
Therefore, when shifting from the low-speed rolling state to the extremely low-speed rolling state, the load (rolling load) applied to the upper / lower work rolls Rs1, Rs2 is set to a constant value between the upper / lower work rolls Rs1, Rs2. Control the gap. At this time, the material to be rolled 1 has a smaller thickness on the exit side than the thickness on the entry side of the rolling mill 3, and the material 1 to be rolled is rolled by the load of the upper and lower work rolls Rs 1 and Rs 2 to be plastic. It is in a state of deformation.

Thereafter, the gap between the upper and lower work rolls Rs1 and Rs2 is gradually released from the rolled state (plastic deformation state), and the load by the upper and lower work rolls Rs1 and Rs2 is set to a certain value, or the material 1 to be rolled is elastic. It reduces until it will be in a deformation | transformation state, and makes the to-be-rolled material 1 the state of elastic deformation.
At the same time, the speed of the rolls on the entry side and the exit side (entrance side speed control roll 2, tension reel 4) or the take-up reel so that the tensions of the material 1 on the entry side and the exit side of the rolling mill 3 are equal. The torque of the tension reel 4 is changed.

  In this process, the tension of the material 1 to be rolled on the entry side and the exit side of the rolling mill 3 or the speed of the material 1 to be rolled fluctuates at the moment when the material 1 to be rolled changes from the plastic deformation state to the elastic deformation state. Therefore, in order to minimize fluctuations in the tension of the material 1 on the entry side and the exit side of the rolling mill 3, the work rolls on the entry side and the exit side of the rolling mill 3 (the entry speed control roll 2 and the tension reel 4). ) Speed or torque of the tension reel 4 is changed.

The speed of the entry side speed control roll 2 and the speed of the tension reel 4 or the amount of change in the torque of the tension reel 4 of these work rolls are calculated from the actual tension of the material 1 or the actual speed of the material 1. To do. As a result, fluctuations in the tension of the material 1 to be rolled can be minimized, and stable operation can be continued.
Moreover, when reducing the load of the upper / lower work rolls Rs1, Rs2, the amount of bending of the upper / lower work rolls Rs1, Rs2 changes and the shape of the material to be rolled 1 also changes. The pressures of the vendors of the upper and lower work rolls Rs1 and Rs2 that correct the deflection amount of the upper and lower work rolls Rs1 and Rs2 are reduced so that the change in the plate shape is minimized.

  Next, the upper and lower work rolls Rs1, Rs2, the intermediate rolls Rc1, Rc2, and the backup rolls Rb1, Rb2 are raised so that the pressure of the vendors of the upper and lower work rolls Rs1, Rs2 does not slip. The rolls Rs1 and Rs2 are opened, and the upper and lower work rolls Rs1 and Rs2 are pulled away from the material 1 to be rolled. At this time, the speed of the material 1 to be rolled and the upper and lower work rolls Rs1 and Rs2 is a peripheral speed of about 1 to 60 mpm, and the upper and lower work rolls Rs1 and Rs2 are covered in a state almost the same as when stopped. Since the work rolls Rs1 and Rs2 can be separated from the rolled material 1, no slip occurs between the upper and lower work rolls Rs1 and Rs2 and the material 1 to be rolled.

Furthermore, if the feed of the material 1 to be rolled is in an extremely low speed state of less than 30 mpm, the possibility of slipping can be reduced to the limit.
Thus, by releasing the upper and lower work rolls Rs1, Rs2 from the material to be rolled 1 stepwise in a low speed state, the upper and lower work rolls Rs1, Rs2 and the material to be rolled 1 are not scratched. The upper and lower work rolls Rs1, Rs2 can be opened during operation.

  When contacting the upper / lower work rolls Rs1, Rs2, the vendor pressure of the upper / lower work rolls Rs1, Rs2 does not slip with the upper / lower work rolls Rs1, Rs2 and the intermediate rolls Rc1, Rc2 or the backup rolls Rb1, Rb2. Increase the pressure, decelerate or accelerate the rolled material 1 to a low speed state, and detect the speed of the rolled material 1 such as a plate speedometer such as a rolling mill entry side speed detector 6 and a rolling mill exit side speed detector 7. Thus, the speed of the material to be rolled 1 is detected, and the speeds of the upper and lower work rolls Rs1 and Rs2 are controlled so that the speeds of the upper and lower work rolls Rs1 and Rs2 coincide with the speed of the material to be rolled 1.

  Further, the drooping amount of the speed control device 41 of the upper / lower work rolls Rs1, Rs2 (a motor for reducing the load current of the electric motor 21) so that the speed of the upper / lower work rolls Rs1, Rs2 follows the speed of the material 1 to be rolled. Rotation speed correction) is set to a certain value. When the upper and lower work rolls Rs1 and Rs2 are in contact with the material to be rolled 1, when there is a difference in speed between the material to be rolled 1 and the upper and lower work rolls Rs1 and Rs2, the electric motor 21 that is a motor of the rolling mill 3 Torque is generated. By setting the Drooping amount to an optimal value, the speed command of the electric motor 21 that is the work roll drive motor is corrected so as to cancel the torque current, so that the material to be rolled 1 and the upper and lower work rolls Rs1, Rs2 slip Can be prevented.

  The position of the upper upper work roll Rs1 is aligned with the pass line of the material 1 to be rolled, the position of the lower work roll Rs2 is gradually raised, and the upper and lower work rolls Rs1, Rs2 are brought into contact with the material 1 to be rolled. The contact state in which the upper and lower work rolls Rs1, Rs2 are in contact with the material to be rolled can be detected by the load detector 8. When the load detector 8 detects the loads of the upper and lower work rolls Rs1 and Rs2, the load is lowered so that the load of the upper and lower work rolls Rs1 and Rs2 becomes a constant value that keeps the elastic deformation state of the material 1 to be rolled. The height position of the lower work roll Rs2 on the side is controlled. When the load on the upper / lower work rolls Rs1, Rs2 reaches a constant value, the pressure of the vendor of the upper / lower work rolls Rs1, Rs2 is decreased.

Next, the position of the lower lower work roll Rs2 is raised and the upper and lower work rolls Rs1 and Rs2 are closed until the material 1 to be rolled is in a rolled state (plastic deformation state). When the material to be rolled 1 is in a plastically deformed state, the thickness on the exit side of the rolling mill 3 becomes smaller than the thickness on the entry side of the rolling mill 3 of the material 1 to be rolled. The speed of the material 1 changes.
Therefore, the state in which the material 1 to be rolled transitions from the elastically deformed state to the plastically deformed state is to be rolled by the rolling mill entry side speed detector 6 and the exit side rolling mill delivery speed detector 7 of the rolling mill 3. It can be detected by measuring the speed difference (or speed ratio) of the material 1.

  When the material 1 to be rolled changes from the elastically deformed state to the plastically deformed state, the tension of the material 1 to be rolled on the entry side and the exit side of the rolling mill 3 decreases. The rolling mill entry-side speed detector 6, the rolling mill exit-side tension detector 10, or the rolling mill entry-side and exit-side speed detectors 1 of the material to be rolled 1. From the results of the rolling mill outlet speed detector 7, the rolling speed at the inlet and outlet of the rolling mill, that is, the speed of the inlet speed control roll 2 and the speed of the tension reel 4, or the torque change amount of the tension reel 4 is calculated. ,to correct. As a result, the fluctuation amount of the tension of the material 1 to be rolled can be minimized.

Further, when the upper and lower work rolls Rs1, Rs2 are closed, the upper and lower work rolls Rs1, Increase Rs2 vendor pressure.
Incoming and outgoing roll speeds (speed of the incoming speed control roll 2 and speed of the tension reel 4) so as to change the tension of the material 1 on the incoming side and the outgoing side of the rolling mill 3 to the set tension, or The torque of the take-up reel (tension reel 4) is changed.
After the rolling state of the material to be rolled 1 shifts to a plastically deformed state and converges within a certain range of fluctuations in tension, the upper and lower work rolls Rs1 and Rs2 of the rolling mill 3 are accelerated to perform normal rolling operation. Put it in a state.

As mentioned above, when the viewpoints of the present invention are summarized,
The rolling device according to the first aspect is
A rolling apparatus comprising one or more rolling mills having upper and lower work rolls for rolling and rolling the material being rolled from above and below, and a roll gap control device for controlling a gap between the upper and lower work rolls,
Load detecting means for detecting a load applied by the work roll to the material to be rolled;
Rolled material speed detection means for detecting the speed of the rolled material on the entry side and the exit side of the rolling mill,
Tension detecting means for measuring the tension of the material to be rolled on the entry side and the exit side of the rolling mill,
Electric motor speed detecting means for detecting the speed of the electric motor that drives the work roll of the rolling mill;
Tension / speed command calculating means for calculating the tension of the material to be rolled on the entry side and the exit side of the rolling mill or the speed command of the electric motor;
Speed control means for controlling the speed of the motor from the actual speed measured by the motor speed detection means and the speed command;
Roll position calculating means for calculating the position of the work roll;
A running roll opening / closing command calculating device responsible for controlling the opening / closing of the work roll to the rolled material while the rolled material is running, and
The inter-running roll opening / closing command calculation device is:
Without stopping the material to be rolled, the load is increased or decreased, the material to be rolled is in an elastically deformed state, the load is kept constant, and the rolling mill entry and exit sides The rolled material from the confined state of the work roll with respect to the rolled material using the roll gap control device in a state where at least one of the tension and plate speed of the rolled material is equal. It is a rolling apparatus characterized by performing control of confinement to the material to be rolled from an open state to the material or an open state of the work roll to the material to be rolled.

The rolling device of the second aspect is
In the rolling device according to the first aspect,
The running roll opening / closing command calculating device is a rolling device that performs control to correct a vendor pressure of the work roll when the load is increased or decreased and when the work roll is opened or closed. .

The rolling device of the third aspect is
In the rolling device according to the first or second aspect,
The rolling roll opening / closing command calculating device controls the rolling of the work roll so as to control the opening and closing of the work roll in a state where the speed of the material to be rolled is less than 30 meters / minute. Device.

The rolling device of the 4th viewpoint is
In any one of the rolling devices according to the first to third aspects,
The running roll opening / closing command calculating device is configured to calculate the rolling-side entrance and exit side coverages based on the rolling-side entrance and exit side speeds of the rolling material detected by the rolling material speed detection means. It is a rolling device characterized by having a speed ratio rolling determination means for determining a speed ratio of a rolled material and determining whether the material to be rolled is in a plastically deformed state or an elastically deformed state.

The rolling device of the fifth aspect is
In any one of the rolling devices according to the first to fourth aspects,
The running roll opening / closing command calculating device is configured to detect elastic deformation from plastic deformation of the material to be rolled, from fluctuations in tension of the material to be rolled on the entry side and the exit side of the rolling mill detected by the tension detection means. Or a tension rolling judging means for detecting a transition from elastic deformation to plastic deformation of the material to be rolled.

The control method of the rolling device according to the sixth aspect is as follows:
In a control method of a rolling device comprising one or more rolling mills having upper and lower work rolls for rolling and rolling the material to be rolled while rolling, and a roll gap control device for controlling a gap between the upper and lower work rolls. There,
The control unit
A first step of increasing or decreasing the load applied to the rolled material by the upper and lower work rolls without stopping the rolled material;
A second step of maintaining the load in a constant state with the material to be rolled reaching an elastically deformed state;
With at least one of the tension and sheet speed of the rolled material on the rolling mill entry side and the exit side being equal, using the roll gap control device, the work roll with respect to the rolled material A third step of opening the work roll from the closed state or closing the work roll from the open state of the work roll to the roll material. It is a control method of the rolling apparatus.

The control method of the rolling device according to the seventh aspect is as follows:
In the control method of the rolling device according to the sixth aspect,
A rolling device control method comprising: a fourth step of correcting a vendor pressure of the upper and lower work rolls when the load is increased or decreased and when the work rolls are opened and closed.

The control method of the rolling device according to the eighth aspect is
In the control method of the rolling device according to the sixth or seventh aspect,
The first step is a control method of a rolling device, wherein when the speed of the material to be rolled is less than 30 meters / minute, the load is increased or decreased without stopping the material to be rolled. .

The control method of the rolling device according to the ninth aspect is as follows:
In the control method for any one of the sixth to eighth aspects,
The speed of the material to be rolled on the entry side and the exit side of the rolling mill is detected, the speed ratio of the material to be rolled on the entry side and the exit side of the rolling mill is calculated, and the material to be rolled is in a plastically deformed state or elastically deformed. It is the control method of the rolling apparatus characterized by including the 5th process which determines whether it is in a state.

The control method of the rolling device according to the tenth aspect is as follows:
In the control method of any of the sixth to ninth aspects of the rolling device,
By detecting the tension of the material to be rolled on the entry side and the exit side of the rolling mill, and detecting the fluctuation of the tension, the transition from plastic deformation to elastic deformation of the material to be rolled or elastic deformation of the material to be rolled It is a control method of a rolling device characterized by including the 6th process of detecting transition from plastic deformation to plastic deformation.

<< Action and effect >>
According to the rolling apparatus S, the work roll 1 is made to transition in a rolling state stepwise during the low-speed operation, so that the work rolls Rs1, Rs2 and the work roll 1 are not scratched or slipped. Rs1 and Rs2 can be opened and tightened.
Accordingly, the upper and lower work rolls Rs1, Rs2 can be opened and closed while continuing the rolling.

Therefore, it is possible to pass the welding point of the material 1 to be rolled 1 with the upper and lower work rolls Rs1 and Rs2 open without changing the upper and lower work rolls during rolling or stopping the rolling mill 3. Thus, the degree of freedom in changing the thickness and width of the material 1 to be rolled is improved.
In this way, the degree of freedom for changing the operation mode and changing the schedule of the material 1 to be rolled with a welded portion is increased.

Furthermore, in a continuous rolling mill, it is possible to change the number of stands to be rolled (the number of rolling mills 3 that perform rolling) while continuing rolling.
Further, since no roll mark is generated on the material 1 to be rolled, the yield is improved, and the operation can be continued without stopping the rolling mill 3, and the operation efficiency is dramatically improved.

  It can be widely used to change the upper and lower work rolls, change the number of running rolling stands (rolling mill 3), and change the running method in the cold rolling equipment.

DESCRIPTION OF SYMBOLS 1 Rolled material 3 Rolling mill 6 Rolling mill entrance side speed detector 7 Rolling mill exit side speed detector 8 Load detector 9 Rolling mill entrance side tension detector 10 Rolling mill exit side tension detector 21 Electric motor 31 Speed detector 41 Speed control device (control device)
51 Upper roll position control device (roll gap control device)
52 Lower roll position control device (roll gap control device)
60 Traveling roll opening / closing command calculation device (control device)
61 Roll position command calculation device (control device)
62 Tension / speed command calculation device (control device)
Rs1 Upper work roll (work roll)
Rs2 Lower work roll (work roll)
S Rolling equipment

Claims (14)

In a control method of a rolling device comprising one or more rolling mills having upper and lower work rolls for rolling and rolling the material to be rolled while rolling, and a roll gap control device for controlling a gap between the upper and lower work rolls. There,
The control unit
The rolled material in a rolled state is decelerated from the rolling speed, and the rolled material is decelerated from a predetermined speed that is less than 30 meters / minute to a speed that is less than 30 meters / minute. with a first step of reducing a load which the upper and lower work rolls is added to the material to be rolled,
A second step of maintaining the load in a constant state with the material to be rolled reaching an elastically deformed state;
With at least one of the tension and sheet speed of the rolled material on the rolling mill entry side and the exit side being equal, using the roll gap control device, the work roll with respect to the rolled material And a third step of releasing the material to be rolled from a closed state. In the control method of the rolling device according to claim 1,
A rolling device control method comprising: a fourth step of correcting a vendor pressure of the upper and lower work rolls when the load is increased or decreased and when the work roll is released. In the control method of the rolling device according to claim 1 or 2,
In the first step, the reduction rate of the speed of the material to be rolled is changed according to the rolling speed, and is gradually reduced from the predetermined speed greater than 30 meters / minute to the predetermined speed. A method for controlling a rolling apparatus , comprising: decelerating the material to be rolled to a speed of less than In the control method of the rolling device according to any one of claims 1 to 3,
The speed of the material to be rolled on the entry side and the exit side of the rolling mill is detected, the speed ratio of the material to be rolled on the entry side and the exit side of the rolling mill is calculated, and the material to be rolled is in a plastically deformed state or elastically deformed. A control method for a rolling device, comprising a fifth step of determining whether the state is a state. In the control method of the rolling device according to any one of claims 1 to 4,
By detecting the tension of the material to be rolled on the entry side and the exit side of the rolling mill, and detecting fluctuations in the tension,
A control method for a rolling apparatus, comprising a sixth step of detecting a transition from plastic deformation to elastic deformation of the material to be rolled or a transition from elastic deformation to plastic deformation of the material to be rolled. In a control method of a rolling device comprising one or more rolling mills having upper and lower work rolls for rolling and rolling the material to be rolled while rolling, and a roll gap control device for controlling a gap between the upper and lower work rolls. There,
The control unit
Without stopping the material to be rolled , the work roll is closed from the open state of the work roll to the material to be rolled at a speed of less than 30 meters / minute. A first step of holding the elastically deformed state;
The roll in a state in which at least a part of at least one of the tension and the plate speed of the material to be rolled on the entry side and the exit side of the rolling mill is equal to each other is at least partially held in the elastic deformation state. Using the gap control device, without stopping the material to be rolled, a second step of closing the work roll from the open state of the work roll to the material to be rolled;
A third step of increasing the load applied to the rolled material by the upper and lower work rolls without stopping the rolled material ;
When the load reaches the target load for rolling and the tension on the rolling mill entry and exit sides of the material to be rolled has reached a set value, acceleration of the upper and lower work rolls is started. A seventh step of transitioning to a rolled state ,
A control method for a rolling apparatus, comprising: In the control method of the rolling device according to claim 6,
A rolling device control method comprising: a fourth step of correcting a vendor pressure of the upper and lower work rolls when the load is increased or decreased and when the work roll is closed. In the control method of the rolling device according to claim 6 or 7,
In the first step, the acceleration rate of the material to be rolled is changed according to the rolling speed, and acceleration is started at a speed that is slower than the normal acceleration rate from a speed of less than 30 meters / minute, and a certain constant speed. After reaching the above, the acceleration rate is increased to further accelerate and shift to the normal rolling state . In the control method of the rolling device according to any one of claims 6 to 8,
The speed of the material to be rolled on the entry side and the exit side of the rolling mill is detected, the speed ratio of the material to be rolled on the entry side and the exit side of the rolling mill is calculated, and the material to be rolled is in a plastically deformed state or elastically deformed. A control method for a rolling device, comprising a fifth step of determining whether the state is a state. In the control method of the rolling device according to any one of claims 6 to 9,
By detecting the tension of the material to be rolled on the entry side and the exit side of the rolling mill, and detecting the fluctuation of the tension, the transition from plastic deformation to elastic deformation of the material to be rolled or elastic deformation of the material to be rolled A control method for a rolling device, comprising: a sixth step of detecting a transition from plastic to plastic deformation. One unit having upper and lower work rolls for rolling and rolling the material being rolled from above and below, a roll gap control device for controlling a gap between the upper and lower work rolls, and a means for giving a bending force to the work rolls A method for controlling a rolling device comprising the above rolling mill,
The control unit
The speed of the rolled material in the rolled state is reduced from the speed at the time of rolling. A first step of slowing down;
After the speed of the material to be rolled is reduced to a speed of less than 30 meters / minute , the load applied to the material to be rolled by the upper and lower work rolls is gradually reduced without stopping the material to be rolled. A second step of gradually reducing the vendor force;
A third step of increasing the bender force of the upper and lower work rolls and adjusting the work rolls existing above and below the material to be rolled so as not to slip;
In the state where the tension results of the material to be rolled on the entry side and the exit side of the rolling mill are equal, or the difference is within a certain value range, using the roll gap control device, the work roll And a fourth step of releasing the rolled material in a non-contact state from the confined state with respect to the rolled material. One unit having upper and lower work rolls for rolling and rolling the material being rolled from above and below, a roll gap control device for controlling a gap between the upper and lower work rolls, and a means for giving a bending force to the work rolls A method for controlling a rolling device comprising the above rolling mill,
The control unit
Without stopping the material to be rolled, at a speed of less than 30 meters / minute , the speed gap between the upper and lower work rolls and the material to be rolled is zero or within a certain range, and the roll gap control device is used. A first step of performing confinement to the material to be rolled from an open state in which the work roll is not in contact with the material to be rolled;
Synchronously with the first step, from the stage of reducing the bending force of the upper and lower work rolls, a second step to give the bender force required during rolling,
A third step of gradually increasing the bender force while gradually increasing the load applied to the material to be rolled by the upper and lower work rolls without stopping the material to be rolled after performing the closing;
Fourth step of increasing the speed of the material to be rolled to a predetermined speed when the load reaches the target load for rolling and the tensions on the entry side and the exit side of the material to be rolled reach the set values. A method for controlling a rolling apparatus, comprising: One unit having upper and lower work rolls for rolling and rolling the material being rolled from above and below, a roll gap control device for controlling a gap between the upper and lower work rolls, and a means for giving a bending force to the work rolls A method for controlling a rolling device comprising the above rolling mill,
The control unit
The rolled material in a rolled state is decelerated from the rolling speed, and the rolled material is decelerated from a predetermined speed that is less than 30 meters / minute to a speed that is less than 30 meters / minute. wherein the load applied to the rolled material and the first step you to not to exceed a predetermined or constant values with,
After the speed of the material to be rolled is reduced to a speed of less than 30 meters / minute , the load applied to the material to be rolled by the upper and lower work rolls is gradually reduced without stopping the material to be rolled. A second step of gradually reducing the vendor force;
A third step of adjusting the bender force so as to release between the upper and lower work rolls and not slip between the work rolls present above and below the material to be rolled;
In the state where the tension results of the material to be rolled on the entry side and the exit side of the rolling mill are equal, or the difference is within a certain value range, the lower work roll is moved using the roll gap control device. When moving downward and releasing from the material to be rolled, and reducing the rolling load below a certain value, by raising the position of the upper work roll, with respect to the material to be rolled of the upper and lower work rolls And a fourth step of releasing the material to be rolled from a closed state in a non-contact state . One unit having upper and lower work rolls for rolling and rolling the material being rolled from above and below, a roll gap control device for controlling a gap between the upper and lower work rolls, and a means for giving a bending force to the work rolls A method for controlling a rolling device comprising the above rolling mill,
The control unit
Without stopping the material to be rolled, at a speed of less than 30 meters / minute , the speed gap between the upper and lower work rolls and the material to be rolled is zero or within a certain range, and the roll gap control device is used. A first step of performing confinement to the material to be rolled from an open state in which the work roll is not in contact with the material to be rolled;
Synchronously with the first step, the bender force is required during rolling from the stage where the upper and lower work rolls are released so that the work rolls existing above and below the material to be rolled do not slip. A second step of applying the vendor force,
A third step of gradually increasing the bender force while gradually increasing the load applied to the material to be rolled by the upper and lower work rolls without stopping the material to be rolled after performing the closing;
When the load reaches the target load for rolling and the tension on the entry side and the exit side of the material to be rolled reach the set values, acceleration of the upper and lower work rolls is started and a certain speed is reached. And a fourth step of increasing the acceleration rate and further accelerating to increase the speed to a normal rolling state after reaching .

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