JP2003245708A - Method for controlling meandering of material to be rolled - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the meandering of a material to be rolled, where, at the time of rolling using tandem rolling equipment, the meandering to the tip end of the material to be rolled is suppressed. <P>SOLUTION: The method for controlling the meandering of the material 1 to be rolled is applied as follows. Meandering measuring meters 4, 5, which measure the meandering amount of the material 1 to be rolled by detecting edge positions of the material at the working side and the driving side, are installed on the inlet side and the outlet side of the m-th rolling mill in the tandem rolling equipment provided with n rolling mills. When the tip end of the material 1 to be rolled is positioned on the position of the meandering measuring meter 4 installed in the inlet side or on the upstream therefrom, screw-down positions at the working side and the driving side are corrected based on the measured value of the meandering measuring meter 4 in the inlet side of the rolling mill. When the tip end of the material 1 to be rolled is positioned on the downstream from the meandering measuring meter 4 installed in the inlet side, the screw-down positions in the working side and the driving side of the rolling mill are corrected based on the measured value of the meandering measuring meter 5 in the outlet side. Here, n is an integer of ≥3 and m is an integer of ≥1 and ≤n. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a plurality of rolling mills.
To be rolled when rolling using a tandem rolling mill
Meandering control method. [0002] 2. Description of the Related Art Tandem rolling equipment having a plurality of rolling mills
In the rolling operation, the material to be rolled is
It is called "meandering" that moves from the center to the working or driving side
When the degree of meandering increases, rolling
The rolled material collides with the side guide of the equipment, and the edge of the tail end
Folds and rolls in that state.
In some cases, a rolling trouble called "mi" may occur. [0003] Rolling rolls (work rolls and auxiliary rolls)
The roll drive motor is attached to the roll end of
Is called the “drive side” and the opposite side is called the “work side”.
Is generally performed, and here also the general name is used.
I will use it. [0004] JP-A-6-182417 discloses a rolling method.
Difference in rolling load between the working side and the drive side of the machine, and the work side and the drive side
Physical model that predicts the meandering phenomenon from the rolling position control output signal of
The meandering amount of the material to be rolled is estimated by Dell, and the meandering amount
Correct the rolling position on the working side and the driving side based on the estimated value.
Disclosed "rolled material meandering control device" that suppresses meandering
Have been. In the case of the technique proposed in the above publication, the meandering amount
Estimation accuracy depends on the accuracy of the physical model that predicts the meandering phenomenon.
Will exist. Therefore, the rigidity of the rolling mill and the rolling roll
Uncertainties such as wear and thermal expansion profiles
Of a physical model for accurately predicting the meandering phenomenon
Is not always realistic. Japanese Patent Application Laid-Open No. 63-20110 discloses a
The width end position of the working side and the drive side of the rolled material (hereinafter referred to as the edge position
) Is directly detected to determine the amount of meandering, and based on this amount of meandering,
Then, adjust the rolling position on the working side and the drive side of the rolling mill to
A “meandering control device” that suppresses line generation has been proposed.
You. In the case of the technology disclosed in the above publication,
Such as the technique proposed in Japanese Unexamined Patent Publication No. 6-182417.
It is not necessary to use a physical model that is difficult to achieve
And a detector that directly detects the meandering amount on the rolling mill entry side
(That is, a meandering meter), the amount of meandering
Is highly accurate. However, the tail end of the material to be rolled
After passing through the meandering meter on the entry side of the mill, perform meandering control.
Important to prevent narrowing down
The meandering control effect at the tail end of
U. [0008] JP-A-2-20608 discloses a continuous pressure
Meandering meters are installed at the entrance and exit of each rolling mill in the rolling mill row
The difference between the meandering amount on the exit side and the meandering side on each rolling mill is
Calculated as the deviation, and the pressure at which the meandering deviation exceeds a predetermined value
Meandering amount of rolling mill on the most upstream side of rolling mill
The working side of the rolling mill so that the deviation is 0 (zero).
Adjust the difference in rolling amount between the (operation side) and the drive side to reduce the occurrence of meandering.
A "rolled material meandering control method" is disclosed. In the case of the technique proposed in the above publication, each rolling
Since meandering meters are installed on the entrance and exit sides of the machine,
The tail end of the rolled material passes through the meandering meter on the entry side of the rolling mill
Until the meandering control can be performed. However, the material to be rolled
After the tail end of the
Measurement of the meandering on the side cannot be performed, and the meandering deviation cannot be calculated.
Therefore, it is necessary to control the meandering of the tail end of the rolled material.
I can't do that. [0010] SUMMARY OF THE INVENTION The present invention provides
The purpose was to provide multiple rolling mills
When rolling using tandem rolling equipment,
Rolled material that can suppress meandering to the tail end of the material
Is to provide a meandering control method. [0011] The gist of the present invention is as follows.
This is the method of controlling the meandering of the material to be rolled as shown in (1). (1) Tandem rolling with n rolling mills
In the meandering control method of the material to be rolled when rolling using equipment
And the entrance of the m-th rolling mill of the tandem rolling equipment
And the working and drive side edges of the material to be rolled
A meandering measuring meter that detects the position and measures the meandering amount of the material to be rolled
And the tail end of the material to be rolled is set on the entry side of the rolling mill.
The position of the girder measuring meter or on the rolling
If it is on the upstream side, the meandering measurement provided on the entrance side of the rolling mill
Reduction of working side and driving side of rolling mill based on measured value of constant meter
Correct the position so that the tail end of the material to be rolled is
If it is on the downstream side of rolling than the meandering measurement meter provided in
Based on the measured value of the meandering meter installed on the exit side,
The rolling position is corrected by correcting the rolling position on the
Meandering control method for rolled material. Here, n is an integer of 3 or more, and m is 1 or more.
It is an integer equal to or less than n. In the following description, the entry side of the rolling mill will be described.
The meandering measurement meter provided in the
The meandering meter provided on the exit side is referred to as “exit meandering meter”. [0015] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
explain in detail. FIG. 1 shows a meandering control of a material to be rolled according to the present invention.
FIG. 4 is a diagram for explaining a method, in which a tandem pressure for rolling a material 1 to be rolled
On the entrance side and the exit side of the m-th rolling mill 3 of the rolling equipment, respectively,
An input for detecting the edge positions of the work side and the drive side of the material 1 to be rolled.
A side meander 4 and an outgoing meander 5 are provided. The same
In the figure, the rolling direction is indicated by an arrow below the material 1 to be rolled.
Direction. Here, the inward meander 4 and the outward meander 5
Is, for example, as shown in FIG.
The material to be rolled 1 is measured as a two-dimensional image by an optical sensor.
And the edge position of the material to be rolled 1 is detected from the above measured image.
It is sufficient to determine the meandering amount by issuing. In addition,
The “rolled material center” in FIG. 2 is the widthwise center of the rolled material.
The "rolling mill center" is the m-th rolling mill in FIG.
No. 3 extends the center in the body length direction in the rolling direction. The "rolling mill center" and the center of view of the camera
Install the camera above the rolled material 1 so that
In other words, in the field of view of the camera shown in FIG.
Of the working-side and drive-side edge positions lw and ld
Then, "1/2" of the absolute value of these differences is the meandering amount.
In the same figure, when the material 1 to be rolled has moved to the working side.
(That is, lw <ld). In the following, in FIG.
Rolling mill 2 which is located one upstream of the m-th rolling mill 3
(Hereinafter simply referred to as the upstream rolling mill 2)
Rolling mill 3 and a rolling mill on its downstream side (hereinafter referred to as downstream side)
It is called a rolling mill. (Not shown) example during tandem rolling
Will be described. In the above case, at the entry side of the m-th rolling mill 3
Is not rolled because the restriction by the upstream rolling mill 2 does not work.
The material 1 can freely rotate. Below, the pressure in this case
The movement of the rolled material 1 will be considered with reference to FIG. This figure
Reference numeral 6 denotes an x-axis and a y-axis in a horizontal plane, and the y-axis is
Deformation area just below (in the figure, "Below the mill"), that is, pressure
Rolling the origin to match the deformation area just below the roll axis of the rolling machine 3
It is taken at the center of the aircraft in the body length direction. Whether the restraint by the upstream rolling mill 2 described above works.
If there is not, the difference in the rolling position between the working side and the driving side of the rolling mill 3
(That is, leveling) is not properly set, and
The thickness difference between the working side and the drive side at the entry side in the rolling mill 3
That is, due to asymmetric rolling factors such as wedges),
The speed difference of the material to be rolled 1 occurs between the work side and the drive side,
The material to be rolled 1 rotates. The operation of the material 1 to be rolled is
The motion is considered to be a rigid body motion in the horizontal plane.
3 The feed direction of the material to be rolled 1 immediately below is the circumferential direction of the rolling roll
, The rolled material 1 at time τ = 0
Point (x₀, Y₀) Time τ = t
At position (x, y) is y₀= F₀(X ₀), Ω₁ To
Rotational angular velocity, v₁ Of the rolled material 1 is ignored
The transfer speed in the x-axis direction is expressed by the following formula and
You. [0022] (Equation 1) [0023] (Equation 2) From the above equation and from the above equation, the
Meandering amount y_C(T) and a distance L from the rolling mill 3
Meandering amount y at the position of the entry side meandering meter 4 placed_S(T)
Is given by the formula and [0025] [Equation 3] [0026] (Equation 4) When the equation and Laplace transform are performed, the following equation is obtained.
Equations and are obtained. [0028] (Equation 5) [0029] (Equation 6)Y_S(S) to Y_CThe response up to (s)
Comparing the first term on the right side of the equation and₀(S) component
Dead time L / v₁ (From the meandering total of 4 to the rolling mill
(Transfer time up to 3).
By comparison, the time constant L / v for the Ω (s) component₁ of
It can be seen that the response is a first-order delay response. Therefore, the meandering side 4 on the rolling mill 3
Can be detected in advance,
The meandering control of the rolling mill 3 is performed based on the measurement result of the row total 4.
This is effective for suppressing the meandering of the material 1 to be rolled. On the other hand, on the exit side of the m-th rolling mill 3,
The rolling material 1 is restrained between the rolling mill 3 and the downstream rolling mill.
And the rotational movement is restricted. Therefore, the outgoing meander
Even if a total of 5 were used, the meandering amount immediately below the rolling mill 3
Measurement with a delay of the transfer time from
Can be. Here, when m = n, the output of the rolling mill 3
On the side, a rolling mill 3 and a winder installed downstream thereof (shown in FIG.
The rolled material 1 is constrained between
Rolling motion is restricted. The meandering phenomenon in the tandem rolling mill
Progresses in a very short time, so the detection delay of the meandering amount is
It is necessary to eliminate as much as possible, and furthermore,
Reduction is likely to occur at the tail end of the material 1 to be rolled.
Therefore, it is necessary to perform meandering control to the tail end of the material 1 to be rolled.
Is important, but in order to achieve these, FIG.
The switching controller 8 is operated as shown in FIG.
What is necessary is just to switch to 8a and 8b. That is, arbitrary control start timing, example
For example, the tail end of the material to be rolled 1 where there is no restriction on the upstream side is
Immediately after passing through the upstream rolling mill 2, to start the control
The contact of the switching controller 8 is connected to the 8a side,
Is located at the entry meandering meter 4 or upstream of it
In other words, the meandering amount of the material 1 to be rolled is
Maintains the connection state to the contact 8a side while measuring with
I do. At this time, the inlet side meandering amount controller 6 controls the inlet side meandering meter.
The meandering amount measured value y by 4_inGiven by the following formula based on
Manipulated variable Sr_inFrom the switching controller 8
It outputs to the rolling-down device 3b of the rolling mill 3, and the working side and the driving side
If the lower position is corrected, the rolling mill 3 is delayed for the meandering change.
It is possible to control without occurring. For example, the material 1 to be rolled is
If it detects that it is meandering to the work side,
3, the pressure device on the working side is reduced by an amount corresponding to the meandering amount.
Close the lower position relatively (that is, reduce the roll gap
It can be modified as follows. Sr_in= K_in× y_in... Here, the above Sr_inIs the work side and drive side
The difference, that is, the target leveling value. Also, K_in
Is the influence coefficient of leveling on the amount of meandering and the control gain.
Is a coefficient that includes
This is the value to be set. It should be noted that the upstream rolling mill 2 does not exist (the
In the case of m = 1), the control is similarly performed at an arbitrary timing.
Contact of switching controller 8 to 8a side to start control
Connected, the tail end of the material 1 to be rolled
Is located on the upstream side, that is, the snake of the material 1 to be rolled is
While the line amount can be measured by the input side meandering meter 4, the contact 8a side
Stay connected to. At this time,
In the position 6, the meandering amount measured value y by the entrance meandering meter 4_inBased on
The manipulated variable Sr given by the above equation_inCalculate and turn off
Output from the switching controller 8 to the rolling-down device 3b of the rolling mill 3,
If the rolling positions on the working side and the driving side are corrected, the rolling mill 3
Can control line changes without delay
It is. Next, the tail end of the material to be rolled 1 is an entrance meandering meter.
4, the material to be rolled 1
If it is no longer possible to measure the meandering amount of
Connect the contact of the switching controller 8 from the 8a side to the 8b side, and
When the contact end of the rolled material 1 passes through the rolling mill 3
Keep until you spend. At this time, the output side meandering amount control device 7
The meandering amount measured value y by the outlet meandering meter 5_ouBased on
The manipulated variable Sr given by the notation_ouCalculate and switch
Output from the controller 8 to the rolling-down device 3b of the rolling mill 3,
The rolling position of the rolling mill 3
Can be controlled without delay.
You. Sr_ou= K_ou× y_ou... Here, Sr in the above equation_ouAlso working side and driving side
This is the target value of the difference (leveling) between the rolling positions. Also, K
_ouIs the K_inSimilarly, the shadow of leveling on the amount of meandering
This is a coefficient that includes the reverberation coefficient and the control gain.
This is a value set according to the material and dimensions. Finally, the tail end of the material 1 to be rolled is
After passing through, the contact point of the switching controller 8 is set to the neutral position.
It is only necessary to return to end the control. The neutral position
Indicates a state where neither of the contacts 8a and 8b is in contact.
U. By performing the above, the material 1 to be rolled
It is possible to control meandering to the tail end,
Meandering can be suppressed to the tail end. Next, the present invention will be described in more detail by way of examples.
I will tell. [0043] [Embodiment] A tandem rolling mill equipped with seven rolling mills is used.
The thickness of SPHC described in JIS G 3131 as material steel
Rolled material having a width of 1265 mm and a thickness of 28 mm
The width was finished to 1250 mm at 1.2 mm. The above
In rolling, the sixth rolling mill of the tandem rolling mill
The dimensions on the entry side are 2.0mm thick and 1255m wide
The rolled material with a thickness of 1.5 mm and a width of 1.5 mm
Was rolled to 1252 mm. Here, the sixth rolling mill
The dimension at the entry side of the mill means that one of the rolling mills on the upstream side
Dimensions. Here, the working side of the sixth rolling mill and the drive
The correction of leveling, which is the difference between the rolling positions on the moving side, is described below.
(A) and (b). Described in (a)
The method described above is a method for controlling meandering of a material to be rolled according to the present invention.
The method described in (b) is a conventional technique as a comparative example.
Is a meandering control method for a material to be rolled based on the above. In this embodiment, (a) and (b)
In either method of (b), the material to be rolled 1 is on the working side.
A meandering phenomenon that moves to the right. (A) "As shown in FIG. 1, the sixth
The meandering 4 on the inlet side and the outlet on the
A side meander 5 is provided, and the tail end of the material 1 is rolled upstream.
Immediately after passing through the machine 2, the contact point of the switching controller 8 is set to the 8a side.
This state is such that the tail end of the material to be rolled 1 is meandering on the entry side.
It was held until it reached a total of 4 positions. At this time, the entrance meandering total 4
Meandering value y_inGiven by the above formula based on
Operation amount Sr_inIs K_inCut as 50 μm / mm
Output from the switching controller 8 to the rolling-down device 3b of the rolling mill 3,
Corrected the rolling position on the working side and the driving side. Then rolled
The tail end of the material 1 has moved downstream from the entry meandering meter 4.
Immediately after, the contact point of the switching controller 8 is connected from the 8a side to the 8b side.
In this state, the rearmost end of the material 1 to be rolled is
It was maintained until it passed mill 3. At this time, the outgoing meander 5
Meandering value y_ouGiven by the above formula based on
Operation amount Sr_ouIs K _ouCut as 20 μm / mm
Output from the switching controller 8 to the rolling-down device 3b of the rolling mill 3,
Corrected the rolling position on the working side and the driving side. " (B) "On the inlet and outlet sides of the sixth rolling mill 3 shown in FIG.
The measured values obtained by the entry side meander meter 4 and the exit side meander meter 5 are provided.
That is, the level of the rolling mill 3 is determined using only the measured value of the meandering meter 4 on the entry side.
Fixed the ring. That is, the tail end of the material 1 to be rolled
Immediately after the section has passed the upstream rolling mill 2, the switching controller 8
Are connected to the 8a side, and this state is
It was held until the end came to the position of the meander 4 on the entry side. this
The meandering amount measured value y by the meandering meter 4 on the entry side_inBased on
The manipulated variable Sr given by the notation_inIs K_in50μ
m / mm and the rolling controller 3 from the switching controller 8
Output to the device 3b to correct the draft position on the working side and the drive side.
Was. Next, the tail end of the material to be rolled 1 is meandering on the entry side.
Immediately after moving to the downstream side from a total of 4, the tail of the material 1 to be rolled
Until the end passes through the sixth rolling mill 3,
The tail end of the material to be rolled 1 is at the position of the entry meandering meter 4.
Manipulated variable Sr_inSwitching controller 8 to keep the value of
To the rolling-down device 3b of the rolling mill 3, and the working side and the driving side
The rolling position of was corrected. In other words, the method of this comparative example
In this case, unlike the case (a), the output meandering meter 5
Meandering value y_ouGiven by the above equation
Operation amount Sr_ouWas not used. " FIGS. 4 and 5 show the methods (a) and (b), respectively.
The results when the meandering control is performed are shown below. FIG. 4A shows the relationship between the meandering amount and time.
That is, it is a diagram illustrating a time change of the meandering amount. FIG. 4A shows the measurement by the meandering meter 4 on the entry side.
The fixed value and the measured value of the output side meander meter 5 are referred to as the "input side meander meter," respectively.
Displayed as a thin solid line as `` measured value '' and `` measured value on exit side meander meter ''
did. In addition, the above-mentioned "measured value on the ingress side meander meter" and "the outgoing side meander meter"
The meandering amount immediately below the rolling mill 3 obtained from the "measured value"
_C(T) is indicated by a thick solid line as “the amount of meandering immediately below the rolling mill”.
Was. FIG. 4A shows no meandering control.
Using a thin broken line,
`` Inlet meander meter measured value '', `` Outlet meander meter measured value '' and
It is shown next to the line of "the amount of meandering just below the rolling mill". 4 (a)
The symbol “△” on the time axis indicates that the tail end of the material 1 to be rolled is on the upstream side.
Passing through the rolling mill 2, the meandering side 4 and the sixth rolling mill 3
In the figure, the “upstream rolling
"Missing machine", "Missing meander in the entrance side" and "Missing rolling mill"
Displayed as Here, the meandering control is not performed at all.
Can be calculated as follows:
You. First, the meandering amount y just below the rolling mill 3_C(T)
And meandering amount y at the position of the total meandering side 4_S(T)
They are given by the above equations and respectively. On the other hand, the rotational angular velocity of the rigid motion of the material 1 to be rolled
ω₁ Is the sheet width b of the material 1 to be rolled, and the transfer speed v in the x-axis direction.
₁ And the wedge ratio change 圧 延 of the rolling mill 3 and the following equation
Is known to be in a relationship. Ω₁ = (Ζv₁ / B) △ ψ ・ ・ ・, Here, ζ is a constant. The above wedge ratio change △ ψ is determined by
Wedge ratio between the entrance and exit sides of the
Is defined by the change of_dfAnd h
_dfTo the entry wedge and the exit wedge of the rolling mill 3, H and h
Is the sheet thickness at the entry side and the exit side of the rolling mill 3, the following equation (10) is obtained.
Is represented by [0055] △ ψ = (h_df/ H)-(H_df/ H) (10). The wedge h on the exit side of the rolling mill_dfIs the pressure
It changes by operating the leveling Sa of the mill 3
Therefore, the following equation (11) holds. [0057] h_df(T) = K_sh× Sa (t) (11) Where h_df(T) and Sa (t) at time τ = t
Wedge and leveling at the exit side of the rolling mill 3
_shIs the coefficient of influence of the output wedge on leveling.
is there. K_shIs what can be determined by testing
It is also possible to obtain theoretically. From the formulas (10) and (11), the mill 3
The lower meandering amount can be expressed by the following equation (12). [0059] (Equation 7) Here, when the meandering control is performed,
In the case where the leveling Sa (t) of the rolling mill is changed,
Meandering amount y_CSince (t) is known, the level
Subtracting the following equation (13), which is the effect of
To estimate the amount of meandering without meandering control.
Can be. [0061] (Equation 8) Similarly, from the formulas (10) and (11),
The meandering amount at the position of the side meandering meter 4 can be expressed by the following equation (14).
Can be. [0063] (Equation 9) When the meandering control is performed, that is, when the rolling mill
Meandering amount y when the leveling Sa (t) is changed_S
Since (t) is known, the leveling Sa is calculated from this amount.
By subtracting the following equation (15), which is the effect of (t), meandering control
Can estimate the amount of meandering if not done
You. [0065] (Equation 10) FIG. 4B shows the working side of the sixth rolling mill.
Leveling correction amount, which is the difference between the
Mari, Sr in the formula and_in, Sr_ouValue and time
FIG. 4 is a diagram collectively showing the relationship with the distance. As already mentioned
In addition, when the meandering control is performed by the method (a), the material 1 to be rolled
Moved to the business side and meandered.
The amount is relatively closed on the working side of the rolling mill.
That is, the roll gap was reduced). this
Is indicated as “work side closed” in the figure. The symbol】 on the time axis in FIG.
As in the case of FIG.
The tail end is the upstream rolling mill 2, the meandering side 4 and the pressure of the sixth unit.
It means the timing of passing through the mill 3
, "Upstream rolling mill slippage", "Inlet meandering gauge slippage" and
It is indicated as "the rolling mill is missing". FIG. 5A is similar to FIG. 4A.
FIG. 9 is a diagram showing a change over time of the meandering amount. This FIG.
In the case of, the measured value of the entrance meander 4 and the output meander 5
The measured value of the
The total measured value is indicated by a thin solid line. In addition,
Amount of meandering just below the rolling mill 3 obtained from the "side meander meter measured value"
Y_C(T) is the “meaning amount directly under the rolling mill”
Shown by a line. FIG. 5A also shows the meandering control.
Using a thin broken line, the estimated meandering amount when
"Inlet meander meter measured value", "Outlet meander meter measured value"
And next to the line of “the amount of meandering just below the rolling mill”. All of the above
The estimated meandering amount without meandering control has already been described.
It was determined by the following method. At the time of FIG. 5 (a)
The mark on the center axis indicates that the tail end of the material to be rolled 1 is the upstream pressure.
It passes through the rolling mill 2, the meandering side 4 and the sixth rolling mill 3.
The timing is shown in the figure.
Missing, meandering meander on entry side, and missing the rolling mill.
And displayed. FIG. 5B shows the working side of the sixth rolling mill.
Leveling correction amount, which is the difference between the
That is, Sr in the equation_inShows the relationship between the value of
FIG. As already mentioned, meandering control by method (b)
In this case, the rolled material 1 moved to the working side and meandered.
Therefore, the “leveling correction amount” is the pressure on the working side of the rolling mill.
The lower position is relatively closed (that is, the roll gap is small).
). This is indicated as “Work side closed” in the figure.
Indicated. The symbol “△” on the time axis in FIG.
The tail end of the material to be rolled 1 is the upstream rolling mill 2,
And the timing of passing through the sixth rolling mill 3,
In the figure, “Upstream rolling mill omission”
”And“ the relevant rolling mill is missing ”. As already described, the above (b)
In the meandering control by the method, the tail end of the material to be rolled 1 is an inlet meandering meter.
Immediately after moving to the downstream side from No. 4, the tail end of the material 1 to be rolled
Until the section passes through the sixth rolling mill 3,
When the tail end of the rolled material 1 is at the position of the entry side meandering meter 4
The switching controller 8 keeps the value of Sr in the above equation
From the work side and the drive side,
The rolling position was corrected. For this reason, in the time axis of FIG.
From "Ingress meandering omission" to "Operating rolling mill omission"
All “leveling correction amounts” are constant values. Figure
4 (a), the tail end of the material 1 to be rolled
Even after passing, meandering control based on the measured value on the exit meandering meter 5
(A) according to the present invention in which leveling is corrected by performing
In the case of the described method, the `` just under the rolling mill ''
The meandering amount is the expected meandering when no meandering control is performed.
The line amount is reduced from 90 mm to 35 mm,
The meandering suppression effect is obtained. On the other hand, before the comparative example shown in FIG.
In the case of the method described in (b) above,
"Wandering amount directly under the rolling mill" did not perform any meandering control
From the expected meandering amount of 90 mm to 60 mm
The meandering suppression effect is only 30 mm,
Is inferior to the meandering suppression effect as compared with the conventional method. [0073] According to the present invention, a plurality of rolling mills are provided.
When rolling using tandem rolling equipment,
Because it is possible to control the meandering to the tail end,
Meandering up to the tail end of the rolled material can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a meandering control method for a material to be rolled according to the present invention. FIG. 2 is a diagram showing an example of a method of obtaining a meandering amount by an inlet meandering meter and an outlet meandering meter.
It is a figure which shows the case where it measures as a two-dimensional image and calculates | requires a meandering amount by detecting the edge position of a to-be-rolled material from the said measurement image. FIG. 3 is a diagram for explaining a contact position switching method of a switching controller for performing meandering control to the tail end of a material to be rolled. 4A and 4B are diagrams illustrating the results of a meandering control method for a material to be rolled according to the present invention in an embodiment, wherein FIG. 4A is a relationship between a meandering amount and time, and FIG. 4B is a relationship between a leveling correction amount and time. FIG. FIGS. 5A and 5B are diagrams in which results obtained by a meandering control method for a material to be rolled according to a comparative example in the embodiment are arranged, wherein FIG. 5A shows the relationship between the meandering amount and time, and FIG. 5B shows the relationship between the leveling correction amount and time. FIG. FIG. 6 is a diagram illustrating a relationship between a coordinate system and a deformation area for explaining a rotational motion of a material to be rolled, and is an explanatory diagram of a meandering phenomenon caused by a rolling mill. [Description of Signs] 1: Material to be rolled, 2: Upstream rolling mill, 3: mth rolling mill, 3b: Rolling-down device of mth rolling mill, 4: meandering meter on entry side, 5: exit side Meander, 6: Inlet meandering amount control device, 7: Outlet meandering amount control device, 8: Switching controller, 8a, 8b: Contact of switching controller.

Claims (1)

Claims 1. A meandering control method for a material to be rolled when rolling is performed using a tandem rolling facility including n rolling mills, wherein the m-th rolling mill of the tandem rolling facility is provided. On the entry side and the exit side, a meandering measuring meter that detects the width end position of the work side and the drive side of the material to be rolled and measures the amount of meandering of the material to be rolled is installed, and the tail end of the material to be rolled is Is located at the position of the meandering meter provided on the entrance side of the rolling mill or on the upstream side of rolling than the meandering meter, the rolling is performed based on the measurement value of the meandering meter provided on the entrance side of the rolling mill. Correct the rolling position of the working side and the drive side of the rolling mill, and if the tail end of the material to be rolled is on the downstream side of rolling than the meandering measurement meter provided on the incoming side of the rolling mill, provide it on the outgoing side. Characterized in that the rolling position on the working side and the driving side of the rolling mill is corrected based on the measured value of the meandering measuring meter. Meander control method of material. Here, n is an integer of 3 or more, and m is 1.
It is an integer not less than n and not more than n.