JP2003053409A - Method for presetting roll bending force in cold- rollingon mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of presetting a roll bending force optimally and highly precisely so that the shape of a coil after working is more correctly matched with the target shape right after starting rolling. SOLUTION: By adding the amount of change of 1st roll bending force for making an error generated by shape deviation to the target shape of a precedingly passed coil zero to the actual value of the roll bending force when rolling a part on the side of working completion of the precedingly passed coil which is rolled by making a cold-rolling mill pass right before rolling of the coil rolled by using the cold-rolling mill to the amount of change of the 2nd roll bending force for making an error generated by the difference between the estimated values of rolling load on the basis of the respective rolling conditions of the precedingly passed coil and the coil zero, the actual value of the roll bending force of the precedingly passed coil is corrected. By the correction value obtained in this way, the preset value of the roll bending force in the cold-rolling mill is decided.

Description

Description: TECHNICAL FIELD The present invention relates to a roll bending machine for a cold rolling mill.
Power presetting method, especially roll bending
Of coil rolling using a cold rolling mill with a mechanism
At the beginning, roll bending force can be preset advantageously
It is concerned with the method. BACKGROUND OF THE INVENTION As is well known, relatively thin-walled
For a so-called coil formed by winding a plate material in a coil shape
When performing rolling, generally, a plurality of pairs of rolling rolls are used.
Is used. And this cold
In the case of cold rolling mills, the coil after rolling is often used.
Shape detector that detects the exit shape from the rolling mill
For example, work roll bending method and backup row
Rebending method, etc.
By adjusting the roll bending force, the rolling
Controlling the crown of the coil to output the coil after the rolling process.
With a roll bending mechanism that changes the side shape
Of the coil detected by the shape detector
Roll bend so that the exit shape always matches the target shape.
Operate the loading mechanism to change the shape of the rolled coil.
By performing feedback control, the coil after rolling
To prevent the occurrence of various shape defects in
It is. [0003] By the way, using such a cold rolling mill,
Therefore, when rolling the coil, generally,
At the start of rolling, the exit shape of the processed coil is
Roll bendy until stable to the shape corresponding to the target shape
The crown of the specified roll is adjusted by the rolling mechanism.
The rolling process proceeds at a relatively slow speed
After the coil shape after processing is stabilized, the processing speed
Is accelerated.
For efficient operation, make sure that the coil exit shape is
The crown of the rolling roll should be
It is possible to start rolling with optimal control in advance.
desirable. Therefore, conventionally, a crown of a rolling roll has been used.
Is exerted in the roll bending mechanism that controls
Initially set the roll bending force to the optimal value,
Several reset methods have been proposed, of which
As one, various factors that affect the shape of the coil after rolling
The shape of the coil after machining, taking into account the various influential factors.
Create a mathematical model based on this mathematical model
The method of determining the preset value of the bending force is
Are known. [0005] A method based on such a mathematical model is adopted.
If you want to roll roll without additional equipment
And it is possible to determine the preset value of
Despite the benefits, creating a mathematical model and
Complicated arithmetic processing is required to determine the preset value
And inevitably occur with the progress of rolling.
Roll profiles that are difficult to predict
Due to changes in coil shape over time due to changes
Not because it is an error, roll bending
It is difficult to determine the optimal preset value of force.
The problem was inherent. Further, Japanese Patent Application Laid-Open No. 7-256320 discloses
Before rolling the coil using a predetermined cold rolling mill
The cold rolling mill was passed one time before
Rolling the target shape of the processed front pass coil
The value of the roll bending force at the time of processing is the actual value
As a roll bendy based on this track record.
Determine the preset value of the bending force and roll bending
How to preset the force has been revealed. this
According to the method, unlike the method based on the mathematical model,
Roll bending without complicated arithmetic processing
It is possible to determine the preset value of force.
You. However, such a roll bendy
Method to determine the preset value based on the actual force value
Now, the roll bending mechanism installed in the cold rolling mill
Due to insufficient capacity of other actuators for shape control
Therefore, in practice, the shape of the front pass coil is
Because it is often difficult to match exactly,
Roll bending force when the coil has the target shape
It was not easy to get the actual value,
Also, for example, the actual value of such roll bending force
Even if it is easily obtained, when such actual value is obtained
Rolling conditions based on the rolling conditions of
Rolling performed with presetting force
If the rolling conditions are different from each other,
Has a large effect on the magnitude of roll bending force.
Since the difference between the rolling load is large,
As the preset value of the roll bending force
I could not adopt it as it was. [0008] The above publication discloses roll bending.
Before the actual force value is obtained, the shape of the pass coil and the roll
Rolled under preset bending force
The difference in rolling load between the coil
Is acquired so that the shape change caused by the difference becomes zero.
It is described that the actual results will be corrected.
However, there is a difference (deviation) in the rolling load.
Since the load value at the time of
It was difficult to find the exact difference between the loads. [0009] Here, the present invention provides the following
It was done against the background of
What is required is a cold pressure with a roll bending mechanism
Using a rolling machine, perform rolling for a given coil
At the time, immediately after machining starts, the shape after coil machining is targeted
Crow the mill roll to more closely match the shape
Optimize roll bending force to control
Can be adjusted at any time, and
Roll bending force adjustment time can be shortened advantageously.
Cold rolling mill that enables more efficient processing
Roll bending force preset method
It is in. According to the present invention, there is provided an image forming apparatus comprising:
To solve, cold pressure with roll bending mechanism
Prior to the start of rolling on the coil using a rolling machine
Preset the roll bending force of the cold rolling mill
In doing so, first, the coil to be rolled
Just before the cold rolling process,
The end of the front pass coil that has been rolled
Obtain the actual value of roll bending force at the time of rolling
On the other hand, the shape of the processing end side portion of the front pass coil
Required to zero the deviation of the
To determine the first roll bending force change amount,
Based on the rolling conditions during rolling of the pre-pass coil
Estimated rolling load and pressure of coil to be rolled
Due to the difference from the estimated rolling load based on the rolling conditions,
The shape change of the il.
Roll bending force change amount required for
And then calculate the roll bending force actual value.
And the first and second roll bending force change amounts
Are added to each other to obtain the roll bending.
The actual force value is corrected, and the correction value thus obtained
Preset of roll bending force in the cold rolling mill
Cold pressure, characterized in that the cut value is determined.
The method of presetting the roll bending force
To the effect. That is, in the cold rolling mill according to the present invention,
For the roll bending force preset method,
Immediately before rolling the coil of
Rolled by cold rolling mill used for rolling
Roll bending during rolling of pre-pass coil
The actual force value is used for subsequent coil rolling.
Reference value of preset value of roll bending force
Is a pre-set based on the mathematical model
Unlike conventional methods for determining
Preset roll bending force without performing
It is possible to determine the default value. In the method of the present invention, the front path coil
The preset value is set at the point when
The actual value of roll bending force, which is the reference value for
As the rolling process progresses,
Unpredictable rolls such as heat crowns that occur inevitably
The shape of the front pass coil over time due to profile changes, etc.
Roll bending force under the condition of maximum change in shape
Can be reliably obtained. Further, according to the present invention, the cold rolling mill row
In the rebending force preset method, the low
For the actual value of the rebending force,
The deviation of the shape of the machining end side part from the target shape
(Before the machining end side of the front pass coil
Required to offset the difference of the shape from the target shape)
The first roll bending force change amount is added
Since the actual value is corrected,
Roll bending mechanism and other shape control actuators
Actually, due to insufficient capacity of eta, etc.
Even if the machining end part of the tool does not match the target shape,
Make sure that the front Pasco has a shape that exactly matches the
Roll bendy at the end of the milling process
The actual value of the buckling force can be advantageously obtained. Further, the roll bending according to the present invention
In the force preset method, the roll bending
For the actual value of the force,
Rolling load estimated value based on rolling conditions
The difference from the estimated rolling load based on the rolling conditions of the power coil
Shape change of the coil relative to the previous pass coil due to
Required to zero out (to offset)
A second roll bending force change amount is added and it takes
The actual value is corrected from the actual value.
The rolling conditions during the rolling process of the previous pass coil,
Different from the rolling conditions of the coil to be rolled
Even before rolling the pass coil, the coil to be rolled
Rolling when rolling is performed with the same estimated rolling load as the estimated load
That the actual value of the bending force can be obtained
It is. Therefore, a cold rolling mill according to the present invention.
Roll bending force presetting method
Due to changes in roll profile, etc.
Changes in shape over time or roll bending mechanisms and their
Insufficient capacity of other shape control actuators, and even rolling
Machining end of front pass coil due to differences in conditions, etc.
There is no error caused by the difference between the shape of
The most reliable way to achieve the target shape
Based on reliable reference values, roll bending force
That the preset values can be easily and reliably determined
It becomes. Therefore, according to the present invention, the cold pressure
According to the roll bending force preset method of mills,
Using a cold rolling mill with a roll bending mechanism,
Immediately after starting the rolling process for the coil
The shape of the coil after machining to the target shape more accurately
Rows that control the roll roll crown to match
Adjusting the bending force in advance optimally and with high precision
The roll bend at the start of the process
Advantageously shortens the adjusting time of the rolling force, and
Can effectively accelerate the start of acceleration.
Processing can be performed more efficiently.
You. Also, according to the present invention, a cold rolling mill
Roll bending force preset method
When determining the preset value of bending force, simply
The roll when the processing end side of the front pass coil is rolled
Obtain the actual value of the rebending force, and
Just add the predetermined amount of roll bending force change
It does not require any skilled skills,
The worker (cold mill use)
Even if the user is an inexperienced unskilled person, it is extremely smooth
Immediately and immediately after the start of rolling, after coil processing
Can match the target shape.
The shape of the coil after processing into the target shape
Improvement of workability of rolling process including work to match
Can be achieved very effectively. Further, according to the present invention, a cold rolling mill row is provided.
For the rebending force preset method,
Immediately after the start of coil rolling,
Since the shape can be more accurately matched to the target shape,
Due to shape deviation from the target shape of the coil immediately after the start of rolling
Various defects such as shape defects such as narrowing
Because the occurrence of rubble can be effectively avoided
is there. Hereinafter, the present invention will be described in more detail.
In order to reduce the number of rolls, the roll
Refer to the drawing for the configuration of the ding force presetting method
While doing so, it will be described in detail. First, FIG. 1 shows a row according to the method of the present invention.
Roll bending that presets the bending force
One embodiment of a cold rolling mill equipped with a
It is shown. As is apparent from FIG.
In the embodiment, the cold rolling mill 10 is a general single star.
And a pair of work rolls 12.
a, 12b, and they were positioned vertically
A pair of intermediate rolls 14a, 14b and a pair of intermediate rolls;
14a and 14b are further positioned vertically.
Having a pair of backup rolls 16a, 16b,
It is configured. Then, each of the rollers 12, 14,
The rotation of the coil 16 causes the coil 20 to rotate.
But from the left side (entrance side) to the right side (outside side) in FIG.
, While being gradually sent out in one direction, a pair of
The rolling is performed between the screws 12a and 12b. In addition, such a cold rolling mill 10 has
Krolls 12a, 12b and intermediate rolls 14a, 14b
Adjust each roll bending force against
A bender device 18 is provided as a roll bending mechanism.
Have been. The bender device 18 has a conventionally known structure.
Work rolls 12a and 12b and intermediate roll 1
Roll bending force for 4a, 14b
By being exerted, the rolls 12 and 14
By controlling the crown, the shape of the coil 20 after rolling is
It can be changed in various ways. Further, on the exit side of the cold rolling mill 10,
Sequentially detects the widthwise shape of the coil 20 after rolling.
A shape detector 24 is provided. This shape detector
24 also has a conventionally known structure.
The shape in the width direction of the coil 20 immediately after rolling is not shown.
Configured to output to roll bending force control device
Have been. Also, such a roll bending force control device is used.
Is processing of the coil 20 input from the shape detector 24.
The later width-direction shape and the preset eye width
Compare with the mark shape, and make their deviation zero,
Work rolls 12a, 12b and intermediate rolls 14a, 14
adjust the roll bending force exerted against b
By controlling the crown of each roll 12, 14,
To change the shape of the coil 20 in the width direction after processing.
Is configured. That is, here, processing of the coil 20
The shape in the subsequent width direction always matches the target shape.
The coil 20 is controlled in the longitudinal direction.
Therefore, it can be made as uniform as possible. The cold rolling mill 10 according to the present embodiment
In particular, the row exhibited by the vendor device 18
Preset equipment for presetting rebending power
Device 26 is separate from the roll bending force control device.
Or as an integral part thereof. More specifically, as apparent from FIG.
In addition, the preset device 26 includes a shape evaluation unit 28,
Collecting unit 30, rolling load estimating unit 32, rolling load estimated value storage unit
34, influence coefficient calculator 36, and preset value calculator 3
It has a basic configuration with eight elements of eight. Soshi
Therefore, among these six elements, the shape evaluation unit 28
Width after processing of coil 20 detected by shape detector 24
The direction shape is input sequentially, and it is always grasped.
Coil 2 that is configured to
0 width direction shape after processing is compared with its target shape.
And the target shape of the width direction shape of the coil 20 after processing.
The deviation from is calculated. Also this
In such a shape evaluation unit 28, in particular,
The whole is passed to the cold rolling mill 10 and rolled.
At the end of processing of the rolled coil 20
Deviation from the target shape in the width direction at
The data is output to the value collection unit 30. The shape determined by the shape evaluation unit 28
State deviation is, for example, an even number evaluated by an orthogonal polynomial
Among the following components, the roll controlled by the vendor device 18
Components determined according to the diameter and length of 12, 14 (for example,
(For example, a secondary component or a quaternary component). Ma
Further, the shape evaluation unit 28 is controlled by the roll bending force control.
After processing the coil 20 incorporated in the device (not shown)
Of the deviation of the shape in the width direction from the target shape
It is of course possible to configure. On the other hand, the actual value collection unit 30 is provided with the shape evaluation unit 2
Of the rolled coil 20 input from FIG.
For the target shape in the width direction at the processing end side
Deviations are now stored as actual shape deviation values
At the same time as the rolling end of the coil 20
Roll exerted on the vendor device 18 when the
The value of the bending force is input from the vendor device 18.
To be stored as the actual roll bending force value.
It has become. Further, the rolling load estimating unit 32
The rolling conditions, such as the material, thickness and width of the sheet, can be entered.
Based on these rolling conditions, a known rolling load equation
To the rolling conditions during rolling of the coil 20
A rolling load estimate based on the rolling load is determined.
Then, the estimated rolling load obtained here is the rolling load.
It is sent from the estimation unit 32 to the rolling load estimated value storage unit 34,
Rolling load estimated value storage unit 34
ing. That is, the rolling load estimated value storage unit 34
Load based on rolling conditions during rolling
So that it can function as a memory for estimates.
is there. Further, the influence coefficient calculation unit 36 also has a
Input to the weight estimation unit 32 during the rolling of the coil 20
The rolling conditions can be entered.
Then, in the influence coefficient calculation unit 36, the coil 20 is
With the change in the estimated rolling load during rolling,
When the width direction shape after processing of the tool 20 is changed,
Such a change in the shape in the width direction after processing of the coil 20 is considered.
(To offset) the vendor device 18
The rolling load estimated value corresponding to the amount of change
Roll roll of rolling load change, representing roll bending force
Rolling strip whose coefficient of influence on
Can be obtained by a well-known calculation formula based on the
ing. In addition, in the influence coefficient calculation unit 36,
Deviation of the width direction shape of the coil 20 from the target shape after processing.
Vendor equipment to make the difference zero (to offset)
A roll corresponding to the shape deviation exhibited in 18
Roll bending of shape deviation, representing bending force
The coefficient of influence on the force can also be obtained using a known calculation formula.
It has become. On the other hand, the preset value calculating section 38 controls the rolling load
The rolling load estimation value stored in the weight estimation value storage unit 34 and the pressure
The difference between the rolling load estimation values obtained by the rolling load estimation unit 32 is entered.
Before being obtained by the influence coefficient calculation unit 36.
Influence coefficient of roll load change on roll bending force and
Enter the coefficient of influence of shape deviation on roll bending force
And the form stored in the actual value collection unit 30.
The actual deviation value and the actual roll bending force value are entered.
It is supposed to be. Then, based on those input values,
In addition, the roll bendy exhibited in the vendor device 18
The preset value of the braking force is determined by using a predetermined
And based on the determined preset value.
And the roll bending force of the vendor device 18 is preset.
It is configured so that it can be set. By the way, the pre-set having such a structure is
Using a cold rolling mill 10 having a cutting device 26,
When the rolling process is performed on the roll 20, the rolling process is performed.
Is activated at the vendor device 18 prior to the start of
Roll bending force can be adjusted to the following procedure, for example.
Will be preset. That is, first, the coil to be rolled
The cold rolling mill 10 just before rolling
Processing of rolled and rolled front pass coil (not shown)
Roll bending force when rolling the end part
Get the value. This is the rolling process for the previous pass coil
Immediately before the end of the process, the vendor device of the preset device 26
18 and stored in the actual value collection unit 30.
Preset value calculator 38 calculates the actual value of roll bending force
It is implemented by taking in. In addition, say here
The front pass coil is a coil other than the coil 20.
Immediately before the rolling of the steel 20, the cold rolling mill 10
The coil 20 may be obtained by machining.
Is passed through the cold rolling mill 10 once before.
It may be obtained by rolling.
same as below. Next, the previous path obtained as described above
The error in the actual value of the coil roll bending force
In other words, the target in the width direction after machining the front pass coil
Actual value of roll bending force by deviation from the shape
Error during rolling, and
The rolling conditions such as the material, plate thickness, and plate width of the pre-pass coil.
Rolling load estimation value based on material, thickness and width of coil 20
Difference from the estimated rolling load based on rolling conditions such as
Any errors that occur in the actual roll bending force
(To offset) the front pass coil
Correct the actual roll bending force value. It should be noted that the roll bending force actual value
For correction, first, the shape of the front pass coil as described above
Finding a value that eliminates (cancels) the error due to deviation
However, this is the end of the rolling process for the previous pass coil.
Immediately before completion, the shape evaluation unit 28 of the preset device 26
Sent from the server and stored in the actual value collection unit 30.
Actual value of shape deviation during rolling of the coil and its effect
Roll bending of the shape deviation obtained by the coefficient calculator 36
And the influence coefficient to the
In the preset value calculation unit 38,
For the target shape of the shape on the coil end side in the coil
The first roll required to zero the deviation
Ending force change amount: y ₁ Is calculated by the following equation (1).
And is implemented by ## EQU1 ## y ₁ = DF / dλ · ΔλLOM (1) [However, dF / dλ: roll bending force of shape deviation]
Coefficient of influence ΔλLOM: Shape deviation during rolling of pre-pass coil
Difference actual value] Also, the deviation of the shape of the previous pass coil
While determining (cancelling) the error due to this,
Based on the rolling conditions of the pre-pass coil and coil 20
The error caused by the difference in the rolling load
The value of the previous pass coil.
Before starting the rolling process, the rolling load of the preset device 26 is estimated.
The material and plate thickness of the previous pass coil,
Determined by the rolling load estimating unit 32 based on rolling conditions such as the strip width.
And the previous pass stored in the rolling load estimated value storage unit 34
Rolling load based on rolling conditions during coil rolling
The estimated value and the material and plate of the coil 20 to be rolled
Determined by the rolling load estimating unit 32 based on rolling conditions such as thickness and sheet width.
Rolling load estimation based on the rolling conditions of the coil 20
When the difference from the value is input to the preset value calculation unit 38,
Then, the rolling process of the previous pass coil is performed by the
Of rolling load change obtained based on rolling conditions
Preset value calculation for coefficient of effect on bending force
The preset value calculation section 3
8, the rolling strip at the time of rolling of the front pass coil
Rolling load estimation value based on the
Due to the difference from the estimated rolling load based on the rolling conditions
Shape change of the coil 20 with respect to the front pass coil
Second roll bendy required to zero out
Ninging force change amount: y _Two Is obtained by the following equation (2).
Is implemented. ## EQU2 ## y _Two = DF / dP · ΔPc (Equation 2) [However, dF / dP: roll bending of change in rolling load]
Coefficient of influence ΔPc on rolling force: Rolled strip of coil 20 and front pass coil
Difference of Rolling Load Estimated Value Based on the Case]
The value of the error due to the shape deviation of the
Rolling load based on the respective rolling conditions of the coil 20
Using a value that makes the error due to the difference between the multiple estimated values zero,
The value of the previous pass coil captured by the preset value
The actual value of roll bending force is corrected.
That is, the following equation (3) is calculated by the preset value calculating section 38.
Correction value of roll bending force actual value: Fset
It is implemented by turning on. Fset = FLOM + y ₁ + Y _Two ... (Equation 3) [However, FLOM: roll bending of the front pass coil
Actual force value y ₁ ： First roll bending force change amount (Previous carp
Value where the error due to the shape deviation of the file is zero) y _Two : Second
Roll bending force change amount (difference in rolling load estimation value based on the rolling conditions of the previous pass coil and coil 20)
Then, the roll obtained as described above is obtained.
Correction value of actual bending force value: Fset, vendor equipment
18 roll bending force pre-set
The preset value is determined as the preset value.
The roll bending force of the vendor device 18
Set it. Note that here, advantageously,
Preset value determination and roll bending force preset
The roll bending by the preset value calculating section 38.
Correction value of the actual value of the swinging force: Simultaneously when Fset is obtained
Will be performed automatically. Then, as described above, the vendor device 18
Preset roll bending power
After that, the rolling process for the coil 20 is started,
Similarly, the coil after processing, which is detected by the shape detector 24,
So that the exit shape of the nozzle 20 always matches the target shape.
Vending device with roll bending force control device not shown
18 to feed the processed shape of coil 20
Roll back the coil 20 while controlling the back.
Thus, the intended rolled material is obtained. As described above, in the present embodiment, the coil 20
Cold rolling immediately before rolling using a cold rolling mill 10
Pass coil rolled by passing through machine 10
Roll that is exerted when the processing end part of
The value of bending force, that is,
Unpredictable rolls such as heat crowns that occur inevitably
Changes in shape over time due to profile changes, etc.
Roll bending force of the front pass coil
For example, the roll bending mechanism and its
Insufficient capacity of other shape control actuators,
Due to differences in rolling conditions between the coil and the coil 20
Shape deviation from the target shape of the front pass coil
The pressure based on the respective rolling conditions of the coil and coil 20
The roll bending force is determined by the difference
First roll roll with zero error in actual values
Amount of bending force change and second roll bending force change
Volume of the pre-pass coil.
To correct the actual bending force, and
According to the correction value, the roll bending in the vendor device 18 is performed.
Determine the preset value of the bending force and
It has preset power. Therefore, in this embodiment as described above,
Indicates the progress of the rolling process due to changes in the roll profile, etc.
Changes in shape over time or roll bending mechanism
Capacity of other actuators for shape control and other
Indicates the end of machining of the previous pass coil due to the difference in rolling conditions, etc.
Error caused by the difference between the end part shape and the target shape
No, it is most suitable to make the shape after processing the coil the target shape.
Roll bending force based on reliable reference values
Can be easily and reliably determined.
Will come. Therefore, according to the present embodiment,
When rolling the coil 20,
Later, the shape of the coil after machining will be more correct to the target shape.
Work rolls 12a, 12b and middle
Each roll crown of the inter-rolls 14a, 14b
Optimum and precise roll bending force to be controlled in advance
It can be adjusted,
Advantageous time to adjust roll bending force at the start
Shortening to effectively accelerate the start of rolling speed acceleration.
It becomes possible. And as a result,
The rolling process for the file 20 should be performed more efficiently.
You can do it. In this embodiment, the front
After obtaining the actual value of the roll bending force of the coil,
Determine the preset value of the bending force and further
Roll bending force preset based on
The entire process is automatically performed by the preset device 26
The rolling process starts from
Immediately after the start, the shape of the coil 20 after machining is
In the work to match, completely eliminate skilled skills.
You can do it, and by doing that,
Series of rolling operations including presetting of rolling force
Smoothly and quickly even by inexperienced unskilled people
Simplify it to the extent that it can be
Is effectively made possible. Further, in the present embodiment, as described above,
Immediately after the start of rolling, the shape of the coil 20 after processing
Can be more accurately matched to the target shape.
The deviation from the target shape of the coil 20 immediately after the start of rolling.
Various shapes including shape defects such as narrowing
Can be effectively prevented
You. Here, according to the method of the present invention, a low
By performing the presetting of the rebending force,
To make sure that the excellent features as described above can be exhibited
The details of the tests conducted by the present inventors
I decided to. That is, first, the structure as shown in FIG.
Using a cold rolling mill with
Rolling is performed, and the processing end side of this one-pass coil
Roll bending exerted when rolling parts
Obtained the actual value of the force. In addition, on the other hand,
Of the finished coil on the machining end side with respect to the target shape.
Get the difference and zero out such shape deviation
Roll bending force change amount required for
I asked. Further, at the time of rolling processing of the coil passed by one pass,
The rolling load estimate based on the rolling conditions in
Rolling load estimation value based on rolling conditions for the second pass of the coil
, And due to their difference, the second pass coil
In order to make the shape change for the coil passed one pass to zero
Of the second roll bending force change required for
I did. After that, the processing end side of the coil
Actual roll bending force exerted during rolling
The first and second values obtained as described above are
Add the roll bending force change amount
A correction value of the bending force actual value was obtained. Then, according to the correction value thus obtained,
To perform the second pass rolling of the coil
Determine the preset value of roll bending force and apply
Based on the preset value, roll bending of the vendor equipment
After presetting the coiling force, the second pass of the coil
Rolling is performed, and immediately after the start of rolling
The rolling shape number of the coil on the exit side shape and the target shape
Deviations are calculated for the fourth and second order components, respectively.
Was. This fourth-order component shape deviation for each rolling sequence number is calculated according to the present invention.
FIG. 2 shows the secondary component shapes according to the rolling order numbers.
The deviation is shown in FIG. 3 as an example of the present invention. In addition, like this
The first pass of the coil in the rolling process
Measures the time from the start of the second pass rolling acceleration to
As a result, the average was about 2.4 minutes. For comparison, as shown in FIG.
Using a cold rolling mill with a structure, another coil
After one pass, the side of the coil that has been passed for one end of machining
Roll bending force exerted when rolling
Roll bending force as a preset value
And then the second pass of the coil
Rolling was performed. Immediately after the start of rolling at this time
The rolling shape number of the coil on the roll-out side with the target shape
Is calculated for the fourth and second order components, respectively.
I did. The quaternary component shape deviation for each rolling order number
In FIG. 2, the secondary component shape deviation by rolling order number is shown.
The differences are shown in FIG. In the rolling process here
From the end of rolling in the first pass of the coil,
When the time until the start of the rolling process acceleration was measured,
The average was about 2.7 minutes. As is clear from FIG. 2 and FIG.
Processing end part of the coil passed by 1 according to the clearing method
Required to make the deviation of the target shape from the target shape zero
The first roll bending force change amount and the rolling strip
1st pass of the 2nd pass coil caused by the difference
Required to eliminate the shape change for the coil
1 second pass with the second roll bending force change amount
Bending force at the processing end side of the processed coil
Based on the correction value obtained by adding to the actual value,
When presetting the binding power, simply
Roll bendy at the processing end side of the coil passed one pass
Roll bending force based only on the actual
Compared to the case where presetting is performed,
The deviation of the coil exit shape from the target shape is clearly
It has a small value. From this, according to the method of the present invention.
By presetting the roll bending force
The roll bending force more optimally and precisely
What can be adjusted can be clearly recognized. As described above, according to the method of the present invention.
When presetting roll bending force
From the end of the rolling process in the first pass
While the time to start acceleration is 2.4 minutes,
When the roll bending force is preset by the method
In this case, the time required is 2.7 minutes.
The method for presetting the roll bending force of the present invention
By adopting
What can be accelerated can be understood clearly. The specific configuration of the present invention has been described in detail above.
However, this is only an example.
Therefore, the present invention is not subject to any restrictions by the above description.
It is not something that can be done. For example, in the above embodiment, the front pass coil
The roll bending force actual value of the preset device 26
From the result collection unit 30 to the preset value calculation unit 38
So, after getting, the first roll bending force change amount
And the second roll bending force change amount are preset
Although the value was calculated by the value calculation unit 38,
Acquisition of actual value of coil roll bending force and first and
What is the order of calculating the second roll bending force change amount?
The first and second rows are not limited to this.
After or after calculating the amount of rebending force change
At the same time, the actual roll bending force of the previous pass coil
It is good to get In the above embodiment, the first and second
Calculate the amount of roll bending force change and roll bendy
Calculation of the correction value of the actual
However, those first and second roll bending force changes
The amount and the correction value of the roll bending force actual value are calculated at once
If you do, you can do nothing. Further, by a roll bending mechanism,
The type of the rolling roll whose crown is controlled is different from that of the above embodiment.
Say that it is not limited to what is shown
It is not even there. In addition, in the above embodiment, the single star
Of a roll bending mechanism in a sand type 6-high rolling mill
For how to preset the roll bending force,
Although a specific example of what applied the present invention was shown, the present invention
In addition, single stand type cold pressure other than 6-high rolling mill
Rolling mills and multiple cold rolling mills are arranged in series.
One coil passes sequentially to multiple cold rolling mills
Roll in a tandem cold rolling mill
Preset the roll bending force of the binding mechanism.
Can be advantageously applied to any of these methods.
It goes without saying that. In addition, although not enumerated one by one, the present invention
Various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art.
It can be implemented in additional aspects and
As long as such embodiments do not depart from the spirit of the present invention,
Both are included in the scope of the present invention,
Needless to say. As is clear from the above description, the present invention
Roll bending force preset of cold rolling mill according to Ming
According to the method, when performing rolling processing on the coil,
Immediately after machining starts, the shape of the coil after machining is
To match the roll bending force more precisely
Can be adjusted optimally and with high precision in advance,
Adjustment of roll bending force at the start of machining
Advantageously shortens the time and effectively starts the rolling speed
The rolling process is more efficient
It is possible to implement it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view, including a partial block diagram, schematically showing a configuration of an example of a cold rolling mill provided with a roll bending mechanism in which a roll bending force is preset according to the method of the present invention. FIG. FIG. 2 shows a quaternary component shape deviation by a rolling order number from a target shape of an exit side shape of a coil immediately after the start of rolling processing of a coil when a roll bending force is preset according to the method of the present invention, by a conventional method. 6 is a graph showing the deviation of the fourth-order component shape by rolling order number from the target shape of the exit side shape of the coil immediately after the start of the rolling process of the coil when the roll bending force is preset. FIG. 3 shows a secondary component shape deviation by a rolling order number from a target shape of an exit side shape of a coil immediately after the start of rolling processing of a coil when a roll bending force is preset according to the method of the present invention, by a conventional method. 6 is a graph showing a secondary component shape deviation for each rolling order number and a target shape of an exit shape of the coil immediately after starting rolling of the coil when a roll bending force is preset. DESCRIPTION OF SYMBOLS 10 Cold rolling mill 12 Work roll 14 Intermediate roll 16 Backup roll 18 Bender device 20 Coil 24 Shape detector 26 Preset device 28 Shape evaluation unit 30 Actual value collection unit 32 Rolling load estimating unit 34 Rolling load estimated value Storage unit 36 Influence coefficient calculation unit 38 Preset value calculation unit

Claims (1)

Claims: 1. Before presetting a roll bending force of a cold rolling mill before starting a rolling process on a coil using a cold rolling mill having a roll bending mechanism, first, Immediately before the rolling process for the coil to be subjected to the rolling process, the cold rolling mill is passed, and the actual value of the roll bending force when the working end portion of the pre-pass coil that has been rolled and processed is obtained. Determine the first roll bending force change amount required to reduce the deviation of the shape of the processing end side portion in the front pass coil from the target shape to zero, and further determine the rolling conditions during rolling of the front pass coil. Due to the difference between the estimated rolling load based on the rolling conditions and the estimated rolling load based on the rolling conditions of the coil to be rolled. A second roll bending force change amount required to reduce the shape change of the first roll coil to the front pass coil to zero, and then, with respect to the actual roll bending force value, the first and second roll bending forces are calculated. The roll bending force actual value is corrected by adding the respective force change amounts, and the preset value of the roll bending force in the cold rolling mill is determined by the correction value thus obtained. To Preset Roll Bending Force of Cold Rolling Mill