JPH09276917A - Rolling mill operation control device - Google Patents

Abstract

(57) [Abstract] [Problem] Even if an error occurs in the strip-entry speed of the strip due to slip between the strip and the guide roll, the strip-speed is corrected to a value close to the actual value. The rolling mill is decelerated and stopped so that the end of the rolled strip does not penetrate through the reel on the feeding side. SOLUTION: The rolling length L from the start of deceleration of the rolling mill until the rolling mill stops and the remaining strip length L ′ remaining on the feeding reel.
When the rolling mill is stopped, the deceleration of the rolling mill is started so that the rolled strip remains on the feeding reel when the rolling mill is stopped, but there is an error in the entry-side strip speed V _B detected from the peripheral speed of the entry-side guide roll. when not, the feeding length of the elongated member from the measured value of the circumferential speed V _M of the rolling roll and the measured value of the inlet-side strip speed V _B and the deceleration rate α of the rolling roll L
If an error occurs in the entry side strip speed V _B , an error occurs in the feeding length calculation. Therefore, the peripheral speed V _M of the rolling roll and the entry side plate thickness t _B and the exit side plate thickness t _F of the rolled strip are calculated. approximation inlet side strip speed V _B from the estimated forward slip lambda _F measured value is input in advance '=
V _M · (1 + λ _F ) · t _F / t _B , and this approximate entry side speed V _B ′, peripheral speed V _{M of the} rolling roll and deceleration rate α
From this, the feeding length L of the strip is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill operation control device suitable for application to a reversible rolling mill that rolls rolled strips such as copper and aluminum through reciprocating rolling rolls in stages. In particular, the present invention relates to an improvement of an operation control device of a rolling mill, in which deceleration of the rolling mill is started and stopped at the end of a rolling pass so that the rolled strip does not come out of the reel on the delivery side.

[0002]

2. Description of the Related Art When rolling a rolled strip in a stepwise manner by reversibly operating a rolling mill and passing the rolled strip back and forth, the end of the rolled strip from the payout reel (rewind side reel) is When it is pulled out, the unrolled end with a large plate thickness enters the rolling roll and breaks the rolling roll, or the end of the rolled strip is fixed to the feeding reel again during the next operation of the rolling mill in the opposite direction. Since it has to be done, there is a risk of impeding the reversible operation of the rolling mill. For this reason, the rolling pass must be stopped while leaving the end of the rolled material on the feeding side reel, but if the end of the material is excessively left on the feeding side reel, the yield of the material is reduced. It is required to start deceleration and stop so that the strip material remains as short as possible to the extent that the side reel does not slip out.

As described above, in order to stop the rolling strip remaining on the feeding side reel, the rolling strip is fed from the feeding side reel after the deceleration of the rolling mill is started until the rolling operation is stopped. It is desirable to start the deceleration of the rolling operation when a strip material having a length (remaining length) L'corresponding to the delivery length L of the material remains on the delivery side reel. This is achieved by comparing the feeding length after the start of deceleration with the remaining length of the strip material remaining on the feeding reel, and starting deceleration of the rolling mill when the feeding length approaches the remaining length. .

As shown in FIG. 7, the feeding length L of the rolled strip is determined from the entry side strip speed (the traveling speed of the strip that enters the rolling roll as shown in FIG. 6) V _B and the deceleration start of the rolling mill. From the time until deceleration (deceleration time) T and L = V _B T / 2, the deceleration time T is calculated from the peripheral speed V _M of the rolling roll and the peripheral speed deceleration rate α of this rolling roll T = V. Since it is represented by _M / α, L = V _B · V _M / 2α obtained by substituting this V _M / α for T
The feeding length L can be obtained by

[0005] peripheral speed V _M of the rolling rolls, detects the rotational speed N _M of the rolling roll, obtained by V _M = N _M · D _M · [pi from this rotational speed N _M and the diameter D _M of the rolling rolls In addition, the entry-side speed V _B of the strip is normally set to the value of the entry-side (upstream of the rolling roll) guide roll or deflector roll (hereinafter referred to as the guide roll), which is arranged between the feeding-side reel and the rolling roll. The number of revolutions N _G is detected, and V _B = N _G · D _G · π is obtained from the number of revolutions N _G and the diameter D _{G of the} guide roll.

On the other hand, the remaining length L'of the feeding side reel is determined by the initial number of windings n ₀ of the strip wound on the feeding side reel at the start of rolling.
Is known, the current winding number n of the strip obtained by subtracting each rotation of the feeding side reel, the inlet side plate thickness t _B , the target winding diameter D ₀ when the rolling mill is stopped (the diameter of the feeding side reel and L '= (n ² · t _B + n · D ₀ )
It can be determined based on π, and if the initial winding number n ₀ of the feeding-side reel is not known, the entry-side reel speed V _B is determined by the feed-side reel rotation speed N _B and the current winding layer number. V _B = N _B · D · π obtained from the diameter D and L ′ =
It can be calculated by [(D ² −D ₀ ² ) · π] / 4t _B.

However, if the rolled strip is thin or the rolling speed is high, slippage may occur between the guide roll and the rolled strip, and therefore the incoming side strip speed V _B may not be measured correctly, so the speed is reduced. Since the feeding length after the start is measured with a value shorter than the correct value, in practice, the deceleration of the rolling mill is started after the remaining length of the strip material remaining on the feeding reel is exceeded. As a result, the rolled strip may penetrate through the reel on the delivery side. In particular, when rolling a rolled strip such as a metal foil of copper or aluminum,
Since the rolling tension is small, the coefficient of friction on the surface of the strip is small, and the rolling speed is high, slipping is likely to occur between the guide roll and the strip, and this tendency becomes extremely large.

In order to prevent the slip between the guide roll and the strip, if the surface of the guide roll is roughened to increase the friction coefficient, the surface of the strip is damaged, so the surface of the guide roll is roughened. Is not preferable. In order to prevent slippage between the guide roll and the strip, a hollow roll is used as the guide roll to reduce the inertial mass and high-precision bearings are used to reduce the rotational resistance of the guide roll bearings. However, there is a limit to preventing slip of the strip by these. Furthermore, instead of detecting the entry-side speed from the number of revolutions of the guide roll, if it is attempted to measure the contact speed by an optical means such as a laser Doppler velocimeter, the mist of the rolling oil makes it difficult to measure the velocimeter, In addition, there is a drawback that the equipment cost is high.

Recently, the feeding length L of the strip after the deceleration of the rolling mill is predicted from the deceleration rate of the rolling mill in which the backward traveling rate of the strip is corrected and the number of rotations of the guide rolls. There has been proposed a rolling mill operation control method that determines the timing of deceleration start of the rolling mill from the predicted value and the remaining length L ′ on the feeding side reel (see Japanese Patent Laid-Open No. 6-142761). The reverse rate of the strip material is the input strip speed V _B relative to the peripheral speed V _M of the rolling roll.
Is calculated as (V _M −V _B ) / V _M , and therefore, in order to obtain the feeding length of the rolled strip after the deceleration of the rolling mill is started using such a backward moving ratio. Is required to be able to accurately measure the entry-side thread speed V _B. However, as described above, the entry-side thread speed V _B changes depending on the thickness of the strip or the rolling speed, and The reverse speed is extremely unstable and is not suitable for correcting the deceleration rate.

[0010]

One problem to be solved by the present invention is to solve this problem even if an error occurs in the strip entry speed of the strip due to slip between the strip and the guide roll. An object of the present invention is to provide an operation control device for a rolling mill capable of correcting the entry-side strip speed to a value close to an actual value and stopping the drive so that the end of the strip does not penetrate through the feed-side reel.

Another problem to be solved by the present invention is to detect the occurrence of an error in the entry strip speed due to slip or the like between the rolled strip and the guide roll, and start the correction of the entry strip speed. Another object of the present invention is to provide an operation control device for a rolling mill that can stop the driving of the rolling mill so that the end of the strip does not penetrate through the feed reel.

[0012]

A first object of the present invention is to provide a first and a second reel, a rolling roll arranged between the first and the second reel, and a first and a second roll. Driving means for driving a rolling mill including first and second guide rolls arranged between a second reel and a rolling roll, and a feeding length of the rolled strip from the start of deceleration of the rolling mill to the stop And a control means for starting the deceleration of the rolling mill so that the rolling strip remains on the feeding side reel when the rolling mill is stopped by comparing the length L with the remaining length of the rolling strip remaining on the feeding side reel. The control means includes a rolling roll peripheral velocity detector for detecting the peripheral velocity V _M of the rolling roll and a strip speed detector for detecting the inlet side strip velocity V _B of the rolling strip from the peripheral velocity of the inlet side guide roll. The feed length L is calculated from the peripheral speed V _M of the rolling roll, the entry speed V _B of the rolling roll, and the deceleration rate α of the rolling roll. Therefore, in the operation control device of the rolling mill including the required calculation circuit, the control means includes the inlet side and outlet side plate thickness detectors for detecting the inlet side plate thickness t _B and the outlet side plate thickness t _F of the rolled strip, respectively. The circuit is based on the peripheral speed V _M of the rolling roll, the inlet strip thickness t _B and the outlet strip thickness t _{F of the} rolled strip, and the estimated advance rate λ _F that has been input in advance. 'an equation V _B' approximating the inlet side strip speed V _B to be alternatively computed by _{= V M (1 + λ F} ) t F / t B to _B, and the control means may occur an error of the inlet side strip speed V _B It is an object of the present invention to provide an operation control device for a rolling mill, which further includes a start-up circuit for detecting or predicting the above and starting the calculation of the calculation formula.

A second problem solving means of the present invention is an operation control device for a rolling mill according to the first problem solving means, wherein the rolling mill is provided with rolling rolls between the first reel and the second reel. Is a reversible rolling machine that reversibly reciprocally passes the rolled strip and gradually rolls the rolled strip.
An operation control device for a rolling mill, characterized in that the operation of the arithmetic circuit is started after the rolling pass in which an error of the entry-side strip speed V _B is caused due to the plate thickness gradually decreasing along the reciprocating pass of the strip. To provide.

A third problem solving means of the present invention is an operation control device for a rolling mill according to the second problem solving means, wherein a small value of the estimated advanced ratio λ _F is calculated as the rolling pass of the rolled strip advances. Another object of the present invention is to provide an operation control device for a rolling mill, which is characterized in that

A fourth problem solving means of the present invention is an operation control device for a rolling mill according to any one of the first to third problem solving means, wherein the control means is the rolling strip winding in the reel on the feeding side. further comprising a ironing roll peripheral speed detector for detecting the peripheral speed V _BI of ironing roll which is rotated in engagement with the layer, starting circuit, the inlet side strip speed V _B is the peripheral speed of the ironing roll feed-out reel It is an object of the present invention to provide an operation control device for a rolling mill, which is characterized in that the arithmetic circuit is activated when it becomes larger than V _BI .

As described above, during the rolling pass, the feeding length from the start of deceleration to the stop is compared with the remaining length of the strip material remaining on the delivery reel, and when the rolling mill is stopped, the strip material rolled on the delivery side reel is compared. By starting the deceleration of the rolling mill so that
At this time, when there is no error in the thicker the low rolling speed or rolled strip material inlet side strip speed V _B is the rolling roll and the measured value of the circumferential speed V _M of the rolling roll and the measured value of the inlet-side strip speed V _B Although the feeding length L of the strip can be accurately obtained from the deceleration rate α of, the feeding length is calculated when the rolling speed is high or the rolling strip is thin and an error occurs in the entry side strip speed V _B. Error occurs in the rolling speed. Therefore, from the measured values of the peripheral speed V _M of the rolling roll, the incoming strip thickness t _B and the outgoing strip thickness t _F of the rolled strip, and the estimated advance rate λ _F that has been input in advance, the approximate incoming strip velocity is obtained. V _B '= V _M · (1 + λ _F ) · t _F / t
Determined by _B, it is possible to accurately obtain the feeding length of the elongated member from this approximation entry side strip speed V _B 'and the circumferential speed V _M and the deceleration rate α of the rolling rolls. Therefore, regardless of whether or not there is an error in the entry-side strip speed V _B , the deceleration start of the rolling mill is not overlooked, and the rolling strip can be driven without penetrating from the feeding reel. When applied to a reversible rolling machine that passes back and forth to gradually roll the strip,
This rolling mill can be operated with high workability.

The error of the entry side strip speed V _B is caused by the high rolling speed or the slip of the rolled strip due to the thinning of the rolled strip, but it is related to the rolled strip winding layer in the feeding side reel. The peripheral speed V _BI of the ironing roll that is rotationally driven in combination is detected, and the peripheral speed V _BI and the thread speed V _{B of} this ironing roll are detected.
Since compared with Article speed V _B bets that an error has occurred is confirmed inlet side strip speed V _B by which is greater than the peripheral speed V _BI of ironing roll, the approximate inlet side strip speed V _B ' The calculation can be reliably performed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an operation control device 10 for a rolling mill according to the present invention, and a rolling mill 12 includes first and second rolling mills. Two reels 14A and 14B, and a rolling roll 16 arranged between the first reel 14A and the second reel 14B.
And the first and second reels 14A and 14B and the rolling roll 1
6 is in the form of a reversible rolling mill consisting of first and second guide rolls 18A, 18B in the form of deflectors which are arranged between 6 and 6 for guiding the strip 1 to be rolled.

In the first pass of the rolling mill 12, the rolled strip 1 is transferred from the first reel (feeding side reel) 14A to the first reel.
After passing through the guide roll 18A, passing through the rolling roll 16 to be thinned, passing through the second guide roll 18B and being wound up on the second reel (winding side reel) 14B, in the next pass, the strip 1 , The second reel (this time becomes the feeding side reel) 14B, the second guide roll 18B, the rolling roll 16, and the first guide roll 18A. This time becomes the reel on the winding side) 14A. In this way, the rolling mill 12 reversibly passes the rolled strip 1 back and forth to roll the rolled strip 1 in stages.

As shown in FIG. 1, the operation control device 10 for a rolling mill of the present invention includes a drive motor M _{16 for} the rolling roll 16 of the rolling mill 12 and a drive motor M _14B or M for the reel 14B or 14A on the winding side. Driving means 20 for reversibly driving _14A
And a control means 22 for driving the driving means 20 at a predetermined rolling speed and for controlling the driving means 20 so as to decelerate and stop the end of the rolled strip 1 on the reel 14A or 14B on the feeding side. ing. In the following description, since the rolling pass in the same direction as the first pass (the forward pass in which the strip 1 moves from the right side to the left side in FIG. 1 and is rolled) is described, the feeding side reel is 14A. Further, the description will be made assuming that the entrance side guide roll is 18A. However, in the case of the reverse path, it is exactly the same as the normal path except that it is replaced with the feeding side reel 14B and the entrance side guide roll 18B. The description of the path is omitted.

The control means 22 is a driving means 2 for the rolling mill 12.
0 is controlled, but the feeding length L of the rolled strip 1 from the start of deceleration of the rolling mill 12 to the stop and the remaining length L ′ of the rolled strip 1 currently remaining on the feeding side reel 14A are obtained. These are compared, and when the rolling mill is stopped, the deceleration of the rolling mill 12 is started so that the rolled strip 1 remains on the feeding reel 14A.

This control means 22 is, as shown in FIG.
Includes inlet side strip speed detector 26A where the rolling roll peripheral speed detector 24 for detecting the circumferential speed V _M to detect the inlet side strip speed V _B of the rolled strip material 1 rolled roll 16 (or 26B), the rolling roll 16
It includes an arithmetic circuit 28 for obtaining the payout length L = V _B · V _M / 2α (equation 1) from the peripheral speed V _M , the entry side speed V _B and the rolling roll deceleration rate α. Further, as will be described later, the control means 22 controls the inlet strip thickness t _B and the outlet strip thickness t of the rolled strip 1.
Plate thickness detectors 30 and 32 that detect _F , respectively, and a reel rotation number detector (pulse generator) 3 that detects the reel rotation numbers of the supply reel 14A and the take-up reel 14B, respectively.
4 and 36 are included. As shown in FIG. 6, rolled strip 1
The entry side Article speed V _B of a feeding speed of the rolled strip material 1 on the upstream side of the rolling roll 16, also the peripheral speed V _M of the rolling roll 16
Is the feed rate of the strip 1 being rolled by the rolling roll 16. The exit strip speed V _F of the rolled strip 1 used to obtain the advanced rate λ _F described later is the feed rate of the strip 1 on the downstream side of the rolling roll 16 as shown in FIG.

The rolling roll peripheral speed detector 24 includes a pulse generator 25 for detecting the rotational speed N _M of the rolling roll 16,
The arithmetic circuit 28 uses the rotation speed N _M of the rolling roll 16 detected by the pulse generator 25 and the diameter (known value) D _{M of} the rolling roll 16 to determine the rolling roll peripheral speed V _M = N _M · D.
Calculate _M · π by calculation. Inlet speed V of strip 1
_The inlet side linear speed detector 26A that detects _B includes a pulse generator 27A that detects the number of rotations of the feeding side guide roll 18A, and the arithmetic circuit 28 rotates the guide roll 18A detected by the pulse generator 27A. From the number N _D and the diameter of the guide roll (known value) D _D , the entry speed V _B = N _D
-Calculate D _D · π (Equation 2).

On the other hand, the remaining length L'of the strip 1 currently remaining on the reel 14A on the feeding side is obtained as follows. First, if the initial winding number n _{0 of} the strip 1 wound on the feeding-side reel 14A at the start of rolling is known, it is fed from the initial winding number n ₀ input from the initial winding number setting device 38. The current winding number n of the strip 1 obtained by counting down (subtracting) each time one pulse is generated by the reel rotation number detector (pulse generator) 34 that detects the rotation number of the side reel 14A (each rotation of the reel). _{= n 0 -n p) (n} p is the number of pulses) generated from the reel rotational speed detector 34, and the thickness at entrance side t _B detected by the thickness detector 30, the target winding diameter D at the mill stopped _{From 0} (the sum of the diameter of the reel 14A on the feeding side and the margin thereof) (known value), the remaining length L ′ is L ′ = (n ²
-T _B + n-D ₀ ) -π (Equation 3) Also, if the initial winding number n ₀ of the feeding-side reel 14A
If it is not understood, the remaining length L ′ of the strip 1 is calculated from the current winding diameter D of the strip 1 on the feeding side reel 14A by L ′ = [(D
²⁻ D ₀ ² ) · π] / 4t _B (Equation 4). The current winding diameter D is the input side speed V _B and the feeding side reel 1.
Relational expression V _B between the rotational speed N _{B of} 4 A and the current winding diameter D of the strip 1.
= N _B · D · π, D = V _B / (N _B · π) (Equation 5) In this case, when V _B cannot be measured correctly, V _B = V _M · (t _F / t _B ) (6
This is a value when the advanced rate λ _{F is set} to 0 in (Expression 7) which expresses the approximate entry side line speed V _B 'which will be described later.

As described above, the arithmetic circuit 28 compares the feeding length L of the strip 1 thus obtained with the remaining length L ', and the feeding length L is the remaining length L'. It is necessary to stop the rolling mill as close as possible to the length L ', that is, when the remaining length L'is equal to the feeding length L and further to the feeding reel 14A with some margin. When the length including the allowance is added, the deceleration start command Ss is supplied to the driving means 20, and the driving means 20 starts deceleration of the rolling mill 12,
After a time T determined by the deceleration rate α, the rolling mill is stopped (see FIG. 7).

In the operation control device for a rolling mill of the present invention, the arithmetic circuit 28 detects the peripheral speed V _M of the rolling roll 16 detected by the rolling roll peripheral speed detector 24 and the strip thickness detectors 30 and 32, respectively. Approximate entry side strip speed V _B 'from the entry side strip thickness t _B and the exit side strip thickness t _{F of the} rolled strip 1 and the estimated advance rate λ _F which is empirically determined and previously input as described later. V _B '= V _M · (1 + λ _F ) · t
Calculated by _F / t _B (7). Advanced rate λ _F
Is the exit side with respect to the peripheral speed V _M of the rolling roll 16 means whether Article speed V _F (downstream side of the rolling roll) is how fast peripheral speed V _M and the outgoing side strip speed V _F of the rolling roll 16 And rolling roll 16
Ratio to the peripheral speed V _M , that is, λ _F = (V _F −V _M ) /
_Calculated from V _M.

The advanced rate λ _F changes depending on the material such as the material to be rolled, the initial plate thickness, the rolling speed, etc.
Under a certain condition, it keeps stable at almost the same value,
The advanced rate α can be experimentally obtained beforehand and applied under various conditions to be rolled. It has been empirically confirmed that the advanced rate λ _F in cold rolling is 0 to 5%. As will be seen later with reference to specific examples of the present invention, the estimated advance rate λ as the rolling pass of the rolled strip 1 progresses.
It is required to introduce a small value of _F into (Equation 7) because the rolling rate decreases as the rolling pass progresses.

Further, the control means 22 detects or predicts that the error of the entry side speed V _B will occur, and the arithmetic circuit 28 makes (7
It further includes a start-up circuit 40 for starting the arithmetic operation of the expression). As will be seen from some embodiments of the present invention described later, this start-up circuit 40 can be operated under a predetermined rolling condition at the entry side speed V.
After the rolling pass in which the error of _B is known to occur or as described later in another embodiment of the present invention, the entry speed V
It is started after the rolling pass in which it is detected that an error occurs in _B. In FIG. 2, reference numeral 42 indicates the rolling roll 1.
Outer diameter D _M of 6, the outer diameter D _D of the guide roll 18A, the target winding diameter D ₀ and advanced rate of feed-out reel at the mill stopped lambda _F
It is a setter for inputting a known value such as "" to the arithmetic circuit 28.

Another embodiment of the present invention is shown in FIG. 3 and FIG. 4, in which the rolling mill 12 has a rolling strip winding layer in the feeding reel 14A (14B in the reverse pass). Ironing roll 44A that is engaged with and is driven to rotate
(44B in the reverse path), the control means 22 further includes an ironing roll peripheral speed detector 46A (46B in the reverse path) for detecting the peripheral speed V _BI of the ironing roll 44A, and the starting circuit 40 will be described later. As described with reference to FIG. 5, except that the arithmetic circuit 28 is started when it is detected that the entry-side speed V _B becomes higher than the peripheral speed V _BI of the ironing roll 44A of the feeding-side reel 14A. This is the same as the embodiment of FIGS. 1 and 2.

The ironing roll 44A (or 44B) which is rotationally driven by engaging with the rolled strip material winding layer in the delivery side reel 14A is the outer periphery of the winding layer of the strip material 1 wound on the delivery side reel 14A. The guide roll 1 is pressed against the winding layer of the strip 1 with a predetermined force by an air cylinder or the like in order to suppress the surface and assist the aligned winding of the strip 1.
Slip of the strip 1 is less likely to occur as compared with 8A and 18B, and the peripheral speed V _BI of the ironing roll 44A is relatively higher than the measured value of the entry-side striation speed V _B detected by the entry-side guide roll 18A. It is close to the true value of the lateral speed V _B.

[0031] Therefore, Wakashi equal circumferential speed V _BI of ironing roll 44A is the entry-side strip speed V _B, it is presumed there is no error in the measurement value of the inlet-side strip speed V _B, Wakashi, ironing roll if the peripheral speed V _BI of 44A is larger than the entering-side strip speed V _B, although the measurement value of the inlet-side strip speed V _B is assumed that the error has occurred, ironing roll 44A and the entry side guide rolls 18A And are slipping at the same rate, or in an extreme case, when these rolls 44A and 18A are completely slipping and not rotating, the peripheral speed V _BI of the ironing roll 44A and the entry side speed V _B of the ironing roll 44A are reduced. even measurements equal the values (7 expression) approximation inlet side strip speed V _B of the '
Value when the advanced rate λ _F of 0 is set to V _M · (t _F / t
If it is larger than _B ), it can be judged that there is no error in the measured value of the entry side speed V _B.

Therefore, as shown in the flow chart of FIG.
_BI is compared with the entry speed V _B (see step 1), and if the circumferential speed V _BI of the ironing roll 44A is not equal to the entry speed V _B (No), the entry speed V B is set. _B
It is determined that there is an error in the start circuit 40 and the operation circuit 28 is operated to perform the operation operation of (Equation 7). In addition, if the peripheral speed V _BI of the ironing roll 44A is the entry side speed V _B. And (if yes) these speeds V _BI and V
_It is judged whether or not _B is larger than V _M · (t _F / t _B ) (see step 2), and if it is larger or larger (Yes).
If so, it is determined that there is no error in the measured value of the entry side speed V _B , and the starting circuit 40 does not give a command for the arithmetic circuit 28 to perform the arithmetic operation of (7), and the arithmetic circuit 28
Is calculated by substituting the measured value of the inlet side speed V _B measured by the inlet side speed detector 26A as it is into (1 formula) or (5 formula) and calculating the payout length L and the remaining length L ′. Ask. If the speeds V _BI and V _B are smaller than V _M · (t _F / t _B ) in the judgment of step 2 (if No), there is an error in the measured value of the entry side speed V _B. Then, the starting circuit 40 gives a command for the arithmetic circuit 28 to perform the arithmetic operation of (Equation 7), and the arithmetic circuit 28 determines the approximate entry side travel speed V _B ′ obtained by (Equation 7) as (1 Formula) or (5
The feeding length L and the remaining length L ′ are calculated by substituting the entry side speed V _B of the equation).

When obtaining the remaining length L'of the strip 1 on the reel 14A on the payout side by the formula (4), the current winding diameter of the strip 1 on the reel 14A on the payout side to be substituted into the formula (4). D is calculated by (Equation 5), but at this time, when the entry-side speed V _B in (Equation 5) cannot be correctly measured (that is, when the entry-side speed V _B includes an error). , V _B = V _M ·
Although it has been described that it is calculated from (t _F / t _B ) (equation 6),
As described above, this is the approximate entry side speed V of (Equation 7).
_B '= in which to determine the estimated forward slip lambda _F as a safe 0 in _{V M (1 + λ F)} · t F / t B.

[0034]

EXAMPLES Two concrete examples of the present invention and one comparative example will be described below. The first embodiment is an example in which a copper strip having an initial plate thickness of 0.4 mm and a width of 350 mm is reversibly stepwise rolled in 5 passes to 0.070 mm. Is an example in which a copper strip having an initial plate thickness of 0.2 mm and a width of 300 mm is reversibly stepwise rolled in 5 passes to 0.040 mm, and in the comparative example, the initial plate thickness is 3 brass strips with a width of 0.6 mm and a width of 400 mm
This is an example of reversibly stepwise rolling in a pass to obtain 0.310 mm. Thickness at entrance side of each pass in these Examples and Comparative Examples (t _B) and exit side thickness (t _F), reduction ratio, rolling speed, the entry side tension (T _B) and the exit-side tension (T _F), Advanced rate,
Tables 1 to 3 show the inlet side guide roll peripheral speed, the outlet side guide roll peripheral speed, the actual values of the inlet side guide speed, and the actual values of the outlet side guide speed, respectively. The actual value of the strip speed was measured by a non-contact speed meter (not shown), and the advance rate was obtained from the actual value of the strip speed on the delivery side and the rolling speed. In each table, the values of the peripheral speeds of the guide rolls on the input and output sides enclosed in parentheses indicate that a slip occurs between the guide roll and the strip.

[0035]

[Table 1]

As can be seen from Table 1, in the first embodiment, the strip material does not slip on the entry side guide rolls until the entry side plate thickness t _B of the 3-pass is 0.160 mm, and the circumference of the entry side guide rolls does not occur. can be gear correctly measure the inlet side strip speed V _B, the 4-pass or later, since the peripheral speed of the entry side guide roll does not match the entry side strip speed V _B, from the peripheral speed of the entry side of the guide roll It turns out that the entry speed V _B cannot be obtained. Therefore, in the first embodiment, the entrance side guide speed V _B is determined from the circumference speed of the entrance side guide roll in the first to third passes, and in the fourth to fifth passes, the rolling roll peripheral speed V _M is calculated by the (Equation 7). To determine the feed-out length L and the remaining length L'using the approximate entry-side thread speed V _B 'obtained from the side and exit side plate thicknesses t _B , t _F and the advance rate, and to determine the deceleration start timing. You can see that

[0037]

[Table 2]

As can be seen from Table 2, in Example 2, when the entrance side plate thickness t _B = 0.200 mm for one pass, the strip does not slip on the entrance side guide roll, and the peripheral speed of the entrance side guide roll is reduced. it can be measured correctly inlet side strip speed V _B from the 2-pass or later, since the peripheral speed of the entry side guide roll does not match the entry side strip speed V _B, input from the peripheral speed of the entry side of the guide roll It turns out that it is not possible to obtain the side draft speed V _B.
Therefore, in the second embodiment, in one pass, the entrance side guide speed V _B is obtained from the peripheral speed of the entrance side guide roll, and in 2 to 5 passes,
The feeding length L and the remaining length are calculated by using the approximate roll speed V _B ′ obtained from the rolling roll peripheral speed V _M , the inlet and outlet plate thicknesses t _B and t _F, and the advance rate according to (Equation 7). It will be understood that the timing for starting deceleration can be determined by obtaining L ′.

[0039]

[Table 3]

As can be seen from Table 3, in the comparative example, the initial entrance side plate thickness t _B is as thick as 0.600 mm and the final plate thickness is relatively thick as 0.310 mm, and the guide rolls on the entrance side are used in all passes. Therefore, the strip material does not slip, and the entry side strip speed V _B can be accurately measured from the peripheral speed of the entry side guide roll. Therefore, in all passes, the measured value of the peripheral speed of the guide roll on the entry side is used as it is as the entry speed V _B to obtain the feeding length L and the remaining length L ′, and the deceleration start timing is determined. I was able to.

As can be seen from Tables 1 to 3, when the rolling speed is low and the strip thickness is large, the distance between the peripheral speed of the inlet guide roll and the actual inlet speed is set. Since there is no difference, and therefore, when there is no difference between the two, the measured value of the peripheral speed of the entrance side guide roll can be used as it is as the entrance side thread speed V _B , so that a troublesome calculation can be omitted. it can. Further, the calculation for correcting the peripheral speed of the entry side guide roll by the advanced rate is performed after a predetermined pass predicted along with the decrease of the plate thickness of the entry side strip or the increase of the rolling speed, or the guide roll of the entry side. Since it is performed after the pass when it is detected that a difference between the peripheral speed and the actual speed of the incoming strip is detected, an error may occur in the feeding length L of the strip from the start of deceleration to the stop. Instead, it is understood that the feeding length L at the start of actual deceleration can be calculated with high accuracy.

[0042]

According to the present invention, as described above, during the rolling pass, the feeding length from the start of deceleration to the stop is compared with the remaining length of the strip material remaining on the feeding reel to stop the rolling mill. Occasionally, the rolling mill is started to decelerate so that the rolled strip remains on the reel and the punching of the strip from the reel is prevented.At this time, the rolling speed is low or the strip is thick. Article from when there is no error in the entry-side strip speed V _B is the measured value of the circumferential speed V _M of the measured values and the rolling rolls of the entry side strip speed V _B based on the peripheral speed of the guide roll and the deceleration rate α of the rolling rolls Te The feeding length L of the material can be accurately obtained. However, if the rolling speed is high or the strip material is thin and an error occurs in the entry side speed V _B , an error occurs in the calculation of the feeding length L. Circumferential speed V _M of the rolling roll, inlet side plate thickness t _B and output side plate thickness t of the rolled strip
Approximation inlet side strip speed from the measured value and the estimated forward slip lambda _F which are input in advance of the _{F V B '= V M ·} (1 + λ F) · t F / t B
By seeking, it is possible to accurately obtain the feeding length of the elongated member from this approximation entry side strip speed V _B 'and the circumferential speed V _M and the deceleration rate α of the rolling rolls. This advance rate means how fast the exit side speed is relative to the peripheral speed of the rolling roll, so it is almost constant under certain rolling conditions and is extremely stable. It is possible to obtain with high accuracy by approximating the entry speed of the side.

Therefore, the feeding length L of the strip from the start of deceleration to the stop of the rolling mill can be initially calculated correctly based on the actually measured value corresponding to the correct value, and thereafter the entry speed V _B Even if an error occurs, the approximate entry side thread speed is calculated based on the entry side thread speed corrected by the stable advance rate, and this is substituted for the entry side thread speed, so the deceleration start of the rolling mill is overlooked. Therefore, it is possible to control the operation of the rolling mill without the rolled strip penetrating from the reel on the feeding side, and when applied to a reversible rolling mill that passes the rolled strip back and forth to gradually roll the strip, This rolling mill can be operated with high workability.

The error of the entry side strip speed V _B tends to occur due to a high rolling speed or slip of the strip strip due to thinning of the strip strip. detecting a peripheral speed V _BI of ironing roll which is driven to rotate engaged with the layer, the peripheral speed V _BI of the ironing roll
And Article speed V _B and the inlet side strip speed V _B by comparing to Article speed V _B is greater than the circumferential speed V _BI of ironing roll
Since it is confirmed that an error has occurred in the
The calculation of _B 'can be reliably performed.

[Brief description of drawings]

FIG. 1 is a schematic system diagram of one embodiment of an operation control device for a rolling mill according to the present invention.

FIG. 2 is a system diagram of control means used in the operation control device of FIG.

FIG. 3 is a schematic system diagram of another embodiment of the operation control device for a rolling mill according to the present invention.

FIG. 4 is a system diagram of control means used in the operation control device of FIG.

5 is a flowchart of the operation of the control means of FIG. 4 for determining whether or not there is an error in the entry-side speed.

FIG. 6 is an explanatory diagram showing a relationship among a rolling speed, an entry-side thread speed, and an exit-side thread speed.

FIG. 7 is a diagram showing a relationship among a rolling speed, an entry-side thread speed, and a deceleration rate.

[Explanation of symbols]

1 strip material 10 operation control device of rolling mill 12 rolling mill 14A first reel 14B second reel 16 rolling roll 18A first guide roll 18B second guide roll 20 drive means 22 control means 24 rolling roll peripheral speed detection 25 pulse generator 26A spur speed detector 27A pulse generator 26B spur speed detector 27B pulse generator 28 arithmetic circuit 30 plate thickness detector 32 plate thickness detector 34 reel speed detector 36 reel speed detector 38 initial Winding number setting device 40 Start circuit 42 Setting device 44A Ironing roll 44B Ironing roll 46A Ironing roll peripheral speed detector 46B Ironing roll peripheral speed detector M _14A Drive motor M _14B Drive motor M ₁₆ Drive motor L Feed length L 'Feed length It

Claims (4)

[Claims] 1. A first and second reel and a rolling roll disposed between the first and second reels, and the first and second reels.
Means for driving a rolling mill comprising first and second guide rolls arranged between the reel and the rolling roll, and the feeding length of the rolled strip from the start of deceleration of the rolling mill to the stop. And a remaining length of the rolled strip remaining on the feeding side reel, and a control means for starting deceleration of the rolling mill so that the rolled strip remains on the feeding side reel when the rolling mill is stopped. The control means includes a rolling roll peripheral speed detector for detecting a peripheral speed V _M of the rolling roll and a strip for detecting an inlet side strip velocity V _B of the rolling strip from a peripheral velocity of the inlet side guide roll. Operation control of a rolling mill including a speed detector and including a calculation circuit for calculating the payout length L by calculation from the peripheral speed V _{M of the} rolling roll, the entry speed V _B and the deceleration rate α of the rolling roll. in the apparatus, the control means, incoming and outgoing side thickness t _B of the rolled strip material Includes entry side and exit side thickness detector for detecting a sheet thickness t _F respectively, wherein the operation circuit thickness at entrance side of the circumferential speed V _M the rolled strip material of the rolling rolls t _B and output side thickness t _F And the input side traveling speed V _B used to obtain the feeding length from the estimated advance rate λ _F input in advance.
Determined by calculating by _{= V M (1 + λ F} ) t F / t B ' operation expression V _B the' approximation inlet side strip speed V _B to be substituted for, also the control means, the entering-side strip speed V _B An operation control device for a rolling mill further comprising a starting circuit for detecting or predicting that an error will occur and starting the calculation of the calculation formula. 2. The operation control device for a rolling mill according to claim 1, wherein the rolling mill passes the rolling strip between the first reel and the second reel to pass the rolled strip. It is a reversible rolling machine that reversibly reciprocates and rolls the rolled strip in stages, and the starting circuit is configured such that the plate thickness gradually decreases as the rolled strip reciprocates, and thus the entrance side is reduced. An operation control device for a rolling mill, characterized in that the operation of the arithmetic circuit is started after a rolling pass in which an error occurs in the filament speed V _B. 3. The rolling mill operation control device according to claim 2, wherein a smaller value of the estimated advanced ratio λ _F is introduced into the arithmetic expression as the rolling pass of the rolled strip advances. Operation control device for rolling mill. 4. The operation control device for a rolling mill according to claim 1, wherein the control means rotates by engaging with a rolled strip winding layer in the reel reel. The starting circuit further includes an ironing roll peripheral speed detector for detecting a peripheral speed V _BI of the driven ironing roll.
The entry side speed V _B is the peripheral speed V _{BI of the} ironing roll.
The operation control device for a rolling mill is characterized in that it is determined that an error has occurred in the entry-side thread speed V _B when it becomes larger than the above value.