JPH0596313A - Method and apparatus for controlling plate shape and plate crown in hot tandem mill - Google Patents

Abstract

PURPOSE:To adjust a plate crown or a plate shape simply, surely and arbitrarily and to obtain an intuitively understandable result without giving an unexpected influence from one control to the other control. CONSTITUTION:A necessary amount of adjustment of the plate crown is obtained from a measured result of the plate crown on the outlet side of a final rolling stand of a hot tandem mill, this and a plate shape changing pattern on each stand are applied to a predetermined process model to calculate the variation of a mechanical crown of each stand (S-2). On one hand, an amount of adjustment of the plate shape in this stand is required from a result of measurement of the plate shape on the outlet side of each stand and the plate shape changing patterns of this and other stands and the condition for a plate crown changing amount = '0' at the final crown are applied to the process model to calculate the mechanical plate crown changing amount (S6). Driving control signal obtained by adding the mechanical plate crown changing amount calculated respectively separately are outputted to an increase bender and a decrease bender at each stand(S7, S8).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate shape / plate crown control method and apparatus in a hot tandem mill.

[0002]

2. Description of the Related Art Conventionally, an operator manually controls a plate shape and a plate crown in a hot tandem mill. However, since the plate crown and the plate shape have the property of affecting each other, in a normal manual control by an operator, the plate shape is deteriorated by controlling the plate crown, or the plate shape is controlled by controlling the plate shape. It would cause the crown to fluctuate, and it was not easy even for a considerable expert.

Therefore, for example, Japanese Unexamined Patent Publication No. 60-15231
As described in Japanese Patent Publication No. 1, a control method has been proposed in which both the plate crown and the plate shape are measured on the exit side of the final rolling stand of the hot tandem mill, and the evaluation function that combines them is minimized. A method called a hill climbing method is used to calculate such an adjustment amount.

[0004]

However, with such a conventional control method, it is difficult to select the constant of the evaluation function, and it is possible to control only the deterioration of the strip shape of a specific stand or to control the exit side of the final rolling stand. It was difficult to control only the plate crown. Furthermore, there are drawbacks in that the calculation becomes complicated and it is difficult to intuitively understand the obtained result.

Therefore, it is possible to easily and surely adjust the plate crown or the plate shape arbitrarily, and the control of one does not unexpectedly affect the other, and the obtained result is intuitively understood. The present invention has been completed for the purpose of providing a plate shape / plate crown control method and device in a hot tandem mill capable of performing the above.

[0006]

Means and Actions for Solving the Problems The plate shape / plate crown control method in the hot tandem mill of the present invention made to achieve the above object is a strip plate shape / plate in each of a plurality of rolling stands. In the plate shape / plate crown control method in the hot tandem mill having the adjusting means for controlling the crown, a process model representing the plate shape and the plate crown control characteristics in each of the plurality of rolling stands is preset. , Specifying the strip crown adjustment amount on the delivery side of the final rolling stand, and applying the strip crown adjustment amount to the process model together with a predetermined condition as a strip shape change pattern for each rolling stand when the designation is made. Calculate the control amount for each adjusting means of each rolling stand and specify the plate shape adjustment amount on the exit side of either rolling stand , Adjusting the strip shape adjustment amount to the process model together with the strip shape change pattern for other rolling stands and the allowable change amount of the final rolling stand exit side sheet crown when the designation is made, and adjusting each rolling stand. It is characterized in that the control amount for each means is calculated, and the calculated control amounts are added to drive and control the adjusting means of each rolling stand.

According to this plate shape / plate crown control method, in adjusting the plate crown, the plate crown adjustment amount is designated and applied to the process model together with the predetermined conditions as the plate shape change pattern for each rolling stand. The control amount for each adjusting means of each rolling stand is calculated.
Here, as the plate shape changing pattern, it is desirable that all the rolling stands satisfy the plate shape changing amount "0", but this is possible only in the case of a considerable thick plate. In this case, the condition of completely non-interference between the plate crown and the plate shape is satisfied. Even if the plate shape change amount "0" is not satisfied, the plate shape is changed according to a predetermined change pattern when the plate crown is controlled by the control amount calculated by the method of the present invention. There is no unexpected situation because it is just a matter of time.

On the other hand, when adjusting the strip shape, the strip shape adjustment amount on either side of the rolling stand is specified,
The control amount for each adjusting means of each rolling stand is calculated by applying it to the process model together with the conditions regarding the plate shape changing pattern for other rolling stands and the changing allowable amount of the final-side rolling stand exit side plate crown. In this case as well, the condition for complete non-interference control is that the amount of change in strip shape at another rolling stand =
"0", Allowable amount of change of final rolling stand delivery side plate crown =
It is "0". Generally, it is possible to achieve the final rolling stand output side plate crown change allowable amount = “0”,
The former condition is satisfied only when the plate thickness is considerably large. Even when the plate shape change amount “0” is not satisfied, when the plate shape of the specific stand is controlled by the calculated control amount, the plate shapes of the other stands are changed in a predetermined change pattern. Since it is only changed according to, there is no unexpected situation.

The respective control amounts calculated in this way are added and used as the final control amount for drive control of the adjusting means of each rolling stand. Here, when the plate crown adjustment amount is not specified (it can be considered that the plate crown adjustment amount = "0" is specified), the plate shape of the specific stand is adjusted independently, and in the opposite case. Adjusts the plate crown independently. It is also possible to specify the shape adjustment amount for all the stands. In this case, a plurality of control variables associated with the strip shape adjustment for each stand and the control variables for the exit side plate crown adjustment at the final rolling stand are all added to execute drive control of the adjusting means of each rolling stand. It will be. In any of these cases, the amount of change in the plate shape or the like that occurs in the other stands as a result of the adjustment based on the designation in each stand can only meet the predetermined conditions. Therefore, if this scheduled condition is set to a small value, even if a plurality of overlapping conditions are set, it will not be an unacceptable adverse effect. Therefore, as compared with the conventional method in which both the plate crown and the plate shape are measured to determine the matching condition between them, simple and satisfactory control can be made possible.

Such a control method can be applied to the plate shape / plate crown control device in the hot tandem mill in which each of the plurality of rolling stands has an adjusting means for controlling the plate shape / plate crown of the strip. Process model setting means for presetting a process model representing the plate shape and control characteristics of the plate crown in each rolling stand, plate crown adjustment amount specifying means for specifying the plate crown adjustment amount on the delivery side of the final rolling stand, and the plate Plate crown adjustment condition setting means that presets a plate shape change pattern for each rolling stand when a crown adjustment amount is specified as plate crown adjustment conditions, and the specified plate crown adjustment amount and the set plate Control amount for each adjusting means of each rolling stand corresponding to the process model based on the crown adjusting condition Plate crown adjusting control amount calculating means for calculating, plate shape adjusting amount specifying means for specifying the plate shape adjusting amount on one of the rolling stand exit sides, and other rolling when the plate shape adjusting amount is specified Specific stand plate shape adjustment condition setting means that presets conditions regarding the plate shape change pattern for the stand and the allowable change amount of the final rolling stand exit side plate crown, and the specified plate shape adjustment amount and Based on the set specific stand plate shape adjusting condition, a plate shape adjusting control amount calculating means for calculating a control amount for each adjusting means of each rolling stand corresponding to the process model, and each of the calculated control amounts And a drive control means for driving and controlling the adjusting means of each rolling stand based on the added result. It can be realized specifically by the plate-shaped and strip crown control device in hot tandem mill according to claim.

In this apparatus, the strip crown adjustment amount designating means is a strip crown adjustment amount based on a strip crown measuring means arranged on the delivery side of the final rolling stand, and a measurement result of the strip crown measuring means and a target strip crown. It is desirable to include a plate crown adjustment amount calculation means for calculating This is because the plate crown is a very delicate problem and it is impossible for the operator to visually observe it. Regarding the plate shape,
It is preferable to provide a means for measuring the plate shape and a means for calculating the plate shape adjustment amount based on the measurement result, but this can be sufficiently observed with the naked eye. Therefore, simply adjust the adjustment amount to “ear wave large adjustment = **%”, “in-ear wave adjustment = **”.
%, ..., ..., "Medium elongation large adjustment = **%", only some are set stepwise, and an input switch etc. for selecting these are provided, and the operator can respond as necessary. A configuration that allows the switch to be operated is also sufficient.

Although control by complete non-interference is most desirable,
This is only true when the plate thickness is large, so
In other words, it is only necessary to adjust the plate shape so that the plate crown does not change. For that purpose, the specific stand plate shape adjustment condition setting means may set the change allowable amount of the final rolling stand delivery side plate crown to zero.

[0013]

EXAMPLE In order to further clarify the constitution, operation and effect of the present invention, a preferable example will be described below. The embodiment will be described with reference to a tandem mill consisting of four stands from the F0 stand on the rolled material side to the final F3 stand, as shown in FIG. Even if the number of stands changes, the following ideas can be applied to control.

Each stand F0 of the tandem mill of the embodiment
F3 is a quadruple roll F0a to F0d, ..., F3a to F
3d, two middle work rolls F0a to F3a, F
Increment benders F0e to F3e for adjusting the end bearing intervals of 0b to F3b, and the upper backup roll F
0c to F3c and the decrease bender F0f to F3f for adjusting the bearing spacing between the work rolls F0a to F3a on the upper side.
And lower depletion benders F0g to F3g for adjusting the bearing intervals of the lower backup rolls F0d to F3d and the lower work rolls F0b to F3b. Also,
On the exit side of the final rolling stand F3, a plate crown gauge Sc for measuring the plate crown is provided, and each stand F0
On the exit side of ~ F3, a plate shape meter ε for measuring the plate shape, respectively
0 to ε3 are provided.

These plate crown gauges Sc and each plate shape gauge ε
The measurement signals of 0 to ε3 are input to the arithmetic processing unit COM for mechanical plate crown control. The arithmetic processing unit COM for controlling the mechanical plate crown includes a central processing unit CPU and a read-only memory ROM.
And a random access memory RAM, and through the input / output port I / O, the plate crown meter Sc and each plate shape meter ε.
A measurement signal of 0 to ε3 is input. Then, based on these measurement signals, the mechanical plate crown change amount for each stand is calculated based on a calculation program that reflects the process model and various conditions preset in the ROM, and the drive based on the calculation result is performed. Increment vendors F0e to F3e of control stations F0 to F3
And Decrease vendor F0f to F3f, F0g to F3g
Is output to. That is, in the system of the present embodiment, by changing the mechanical plate crown based on the final stand exit side plate crown measurement result and each stand exit side plate shape measurement result, the target plate shape / plate crown is changed. It is configured so that rolling can be performed.

Next, the flow of arithmetic processing executed by the arithmetic processing unit COM for controlling the mechanical plate crown will be described with reference to FIG.
It will be described based on the flowchart of FIG. When the arithmetic processing is started, first, it is determined whether or not the plate crown gauge Sc is at the measurement timing (S1). This is a process necessary when the plate thickness is measured at the end of the rolled plate using the scanning sensor as the plate crown gauge Sc. This is because the scanning-type sensor cannot perform plate crown measurement until one reciprocating operation is completed.

If "YES" is determined in this processing, the plate crown measurement result is taken in and the plate crown adjustment amount necessary for adjusting the plate crown toward the target plate crown is calculated. Each stand F0 to F3
The plate shape change pattern in step S4 is applied to a predetermined process model to calculate the mechanical plate crown change amount dSCT _i M (for Sc; i = 0 to 3) at each of the stands F0 to F3 (S2). Detailed arithmetic expressions will be described later. If it is determined to be "NO" in S1, S2 is passed.

Then, the counter j is set to 0 (S
3), it is determined whether the shape meter of the Fj stand can be used (S4). This is a process for considering the case where the plate shape meter is not provided in all of the stands depending on the case, and one of them is being replaced or has a failure. Note that this also includes the case where there is no shape meter at all.

When the plate shape meter of the Fj stand can be used, the plate shape measurement result εj at the Fj stand is fetched to determine whether or not it is within the target plate shape range (S).
5). When this determination is “NO”, the Fj
The plate shape adjustment amount for keeping the plate shape on the stand output side within the target plate shape range is calculated, and this adjustment amount, the plate shape change pattern in the other stands, and the plate crown change amount in the final F3 stand = “0 The condition of “” is applied to the process model to calculate the mechanical plate crown change amount dScT _i M (for εj; i = 0 to 3) at each of the stands F0 to F3 (S
6). Detailed arithmetic expressions and the like will be described later.

After that, the processes of S4 to S6 are repeatedly executed while incrementing j until j = 3 (S7, S8). Then, if it is determined in S7 that j = 3, the process proceeds to the next step, and the mechanical plate crown change amount dScT _i M (for Sc; i = 0 to 3), dScT calculated for each of the F0 to F3 stands is calculated. _i M (for ε1;
i = 0 to 3), dScT _i M (for ε2; i = 0 to 3), ... Are added (S9), and the result is used as a drive control signal for the increment vendors F0e to F3e and decks of the stands F0 to F3. The lease vendors F0f to F3f and F0g to F3g are output (S10).

Thereafter, the processes of S1 to S10 are repeatedly executed until the end of rolling (S11). The basic idea of this system in the above arithmetic processing is that the final F3 stand output side plate crown (ScT ₃ ) and each stand output side plate shape (ε ₀ ~
It is "non-interference control" of ε ₃ ). The purpose of this non-interference control is to avoid difficult and complicated operations such as finding the minimum value of the evaluation function as in the past.

That is, the aim is to control the following:
It Final stand Departure plate Crown ScT₃When controlling
Is the shape of each stand plate ε ₀~ Ε₃Not to change
And the final stand output side plate crown ScT₃Is the target value
Operate the actuator of each stand so that

When controlling the shape of one stand, the actuator of each stand is controlled so that the shapes of the other stands and the final stand exit side plate crown ScT ₃ do not change and the shape becomes a target value. To operate. With this idea, regardless of the presence or absence of a shape meter,
It is possible to control with the same logic. That is, since the plate shape is controlled for each specific stand, even if the shape meters of all the stands are not usable, it is possible to perform feedback control only on the shapes of the usable stands.
Further, even when there is no shape meter at all, the final stand delivery side plate crown ScT ₃ can be controlled while maintaining the shape.

Further, until the best shape measuring instrument is put into practical use, the book is based on the operator's input of the shape of each stand (it is considered that selection of several levels of the ear wave size to the middle expansion size is sufficient). It is also possible to control by logic. Even with this, even compared to the current shape control by the operator, there is an advantage that only the necessary shape of the stand can be controlled while keeping the final stand exit side plate crown ScT ₃ constant. In this case, change to step S4
Do you instruct the stand to adjust the plate shape? The determination condition may be

The concept of control in the system of the present embodiment is a method of controlling the plate crown and plate shape in the tandem mill, which can be applied to feedback control during rolling and the front coil It can also be applied to preset control by feeding back the rolling condition of.

In this way of thinking, it is possible to completely carry out the non-interference control when the stand to be controlled has a shape change coefficient ξ = 0, that is, in a range where the plate thickness is sufficiently thick. This is the case for a stand that performs rolling. Regarding the data of the shape change coefficient ξ, “Plasticity and Working, 27-308, 1071 (1986)” shows aluminum and aluminum alloy. The contents are as shown in FIG. The shape change coefficient ξ = 0 is because the formulation parameter γ ≧ 0.010 for 5000 series Al alloys, γ ≧ 0.007 for 3000 series Al alloys, γ ≧ 0.002 for pure aluminum series, and the stand with work roll diameter Dw = 800mm. When the plate width b = 1000 mm, the plate thickness h ≥ 26.0 mm (5000 series), h ≥ 20.7 mm (300
The range is 0 system) and h ≧ 8.9 mm (1000 system).

On the other hand, if such a plate thickness condition is not satisfied and the shape change coefficient ξ ≠ 0 even at the leading F0 stand, complete decoupling cannot be achieved. In that case, various ways of handling can be considered. For example, the following method can be used. Of course, it can be easily extended to other methods.

Conditions Final stand output side plate crown ScT ₃
When controlling, the shape changes of all stands should be equal. Condition F _j When controlling the shape ε _j of the stand, the final stand output side plate crown ScT ₃ is constant (no change), and the shapes of the other stands are changed equally.

Next, the process model used for the calculation will be described. The following formula is known as the relationship between the plate crown and the plate shape in tandem rolling. That is, the relationship between the plate crown and the plate shape on the stand-out side is "plasticity and processing,
25-286, 1034 (1984) ”, it is represented by the following equations (1) to (3).

[0030]

[Equation 1]

On the other hand, between the stand transfer rate ζ _i and the stand genetic coefficient η _i , the relation of the equation (4) of the equation 2 is established.

[0032]

[Equation 2]

Next, when the equations (1) to (3) are satisfied in one steady state and another steady state, the change between them will be considered. It is assumed that the plate thickness does not change between the two states, and the parameters ζ _i , η _i , ξ _i , ε ⁰ _i are constant before and after the change. [State 1] (= current time)

[0034]

[Equation 3]

[State 2] (= next step)

[0036]

[Equation 4]

[Change amount] (= (state 2)-(state 1))

[0038]

[Equation 5]

Here, each variable with d represents the change from the state 1. That is,

[0040]

[Equation 6]

The equation (13) is approximately represented by the equation (18) as shown in the following equation 7.

[0042]

[Equation 7]

Of the above equations, the equations (11) and (12) are displayed in a matrix form for F0 to F3 stands, and the equation (19) below is obtained. However, the F0 stand entrance side plate crown was constant (dScT _-1 = 0). This is,
It is a process model in an example. Since there are 8 simultaneous equations for 12 unknowns, they cannot be easily solved as they are.

[0044]

[Equation 8]

[1: General format] A specific calculation formula for non-interference control is shown below. Here, the description is made for the case where complete non-interference cannot be performed. The calculation formula in the case where complete non-interference is possible may be ξ ₀ = 0 in the obtained calculation formula.

[1-1: Control of Final F3 Stand Outgoing Side Plate Crown ScT ₃ (corresponding to the content of the calculation of S2 in the arithmetic processing routine)] When controlling the final stand outgoing side plate crown ScT ₃ , The mechanical plate crown ScT _i M of each stand that satisfies the conditions is calculated, and then the set value of the actuator is calculated.

[Conditions to be satisfied]

[0048]

[Equation 9]

By giving the conditions of the equations (20) and (21) shown in the equation 9, the equation (19) becomes a simultaneous equation with eight unknowns for eight equations. [Equation to be Solved] Considering equations (20) and (21), the last four lines of equation (19) are as follows.

[0050]

[Equation 10]

Here, A1 is represented by the following equation (23).

[0052]

[Equation 11]

The first four lines of the equation (19) are expressed by the following formula 12
Equation (24) is obtained.

[0054]

[Equation 12]

Here, A2 and A3 are (2
This is as shown in equations (5) and (26).

[0056]

[Equation 13]

From equation (22),

[0058]

[Equation 14]

It becomes Therefore, the required mechanical plate crown dScT _i M is calculated by the following equation (28).

[0060]

[Equation 15]

Expression (27) is expressed by Expressions (29) to (33) in Expression 16 when expressed by algebraic expressions.

[0062]

[Equation 16]

[1-2: Control of final F3 stand plate shape ε ₃ (corresponding to the content of the calculation of S6 when j = 3 in the calculation processing routine)] In the case of controlling the final stand plate shape ε ₃ , The mechanical plate crown ScT _i M of each stand satisfying each condition of 1 is obtained, and then the set value of the actuator is obtained.

[Conditions to be satisfied]

[0065]

[Equation 17]

By giving the equations (34) to (36) of the equation 17, the number of unknowns becomes 8, so that (19)
The equation is easy to solve. [Equation to be Solved] Equations (34) to (3) shown in Equation 17
Considering equation (6), the latter four lines of equation (19) are given by
Equation (37) of 8 is obtained.

[0067]

[Equation 18]

The first four lines of the equation (19) are as shown in the equation (38).

[0069]

[Formula 19]

From equation (37),

[0071]

[Equation 20]

It becomes Therefore, the mechanical plate crown dScT _i M to be calculated is calculated by the equation (40) of the equation 21.

[0073]

[Equation 21]

Expression (39) can be expressed as an algebraic expression,
Equations (41) to (45) are obtained.

[0075]

[Equation 22]

[1-3: Control of F2 stand plate shape ε ₂ (corresponding to the content of the calculation of S6 when j = 2 in the calculation processing routine)] Similarly, when controlling the F2 stand plate shape ε _2. Obtain the mechanical plate crown ScT _i M of each stand that satisfies the following conditions, and then find the set value of the actuator.

[Conditions to be satisfied]

[0078]

[Equation 23]

In this case also, the equations (46) to (48) in the equation 23 are used.
Given the formula, the number of unknowns in formula (19) becomes eight, which can be easily solved. [Equation to be Solved] Considering the equations (46) to (48) of the equation 23, the latter four lines of the equation (19) are given by
Equation 9) is obtained.

[0080]

[Equation 24]

The four lines in the first half of the equation (19) are expressed by the following equation 25.
Equation (50) of

[0082]

[Equation 25]

From equation (49),

[0084]

[Equation 26]

It becomes Therefore, the required mechanical plate crown dScT _i M is calculated by the following equation (52).

[0086]

[Equation 27]

Expression (51) is expressed by the following mathematical expressions (53) to (57) when expressed by algebraic expressions.

[0088]

[Equation 28]

[1-4: Control of F1 stand plate shape ε ₁ (corresponding to the content of the calculation of S6 when j = 1 in the calculation processing routine)] Similarly, when controlling the F1 stand plate shape ₁ , Find the ScT _i M of each stand that satisfies the following conditions, and then find the actuator setting. [Conditions to meet]

[0090]

[Equation 29]

Also in this case, the equation (58) to (6
Since equation (0) is given, the number of unknowns in equation (19) becomes eight, which can be easily solved. [Equation to be Solved] Considering the equations (58) to (60) of the equation 29, the last four lines of the equation (19) are the equation (61) of the following equation 30.

[0092]

[Equation 30]

The four lines in the first half of the equation (19) are expressed by the following equation 31
(62) is obtained.

[0094]

[Equation 31]

From equation (61),

[0096]

[Equation 32]

It becomes Therefore, the required mechanical plate crown dScT _i M is calculated by the following equation (64).

[0098]

[Expression 33]

Expression (63) is expressed by the following expressions (65) to (69) when expressed by algebraic expressions.

[0100]

[Equation 34]

[1-5: Control of F0 stand plate shape ε ₀ (corresponding to the content of the calculation of S6 when j = 0 in the calculation processing routine)] Similarly, when controlling the F0 stand plate shape ε ₀ : , The mechanical plate crown ScT _i M of each stand that satisfies the following conditions is obtained, and then the set value of the actuator is obtained.

[Conditions to be satisfied]

[0103]

[Equation 35]

Also in this case, the equations (70) to (7) in the above equation 35 are used.
Since the number of unknowns in equation (19) becomes 8 according to equation 2),
Easy to solve. [Equation to be Solved] Considering the equations (70) to (72) of the equation 35, the latter four lines of the equation (19) are expressed by the following equation (7).
It becomes the formula 3).

[0105]

[Equation 36]

The four lines in the first half of the equation (19) are given by
Equation (74) of 7 is obtained.

[0107]

[Equation 37]

From equation (73),

[0109]

[Equation 38]

It becomes: Therefore, the mechanical plate crown dScT _i M to be obtained is calculated by the following expression (76) of Expression 39.

[0111]

[Formula 39]

When the equation (75) is expressed by an algebraic expression, the following equation 4 is obtained.
Equations (77) to (81) of 0 are obtained.

[0113]

[Formula 40]

[2: Case where complete non-interference is possible] In the above, F
If the zero stand shape change coefficient ξ ₀ = 0, the calculation formula in the case where complete non-interference is possible can be obtained. [2-1: Control of F3 stand plate crown ScT ₃ ] (2
By setting ξ ₀ = 0, equations (9) to (33) become equation (82) of the following equation 41. dεc = 0, and
It is completely non-interferable.

[0115]

[Formula 41]

Further, from the equation (28), (83) of the equation 42
The relationships of Expressions (86) are derived.

[0117]

[Equation 42]

That is, in the case of ξ ₀ = 0, the F0 stand changes the mechanical plate crown by the formula (83) of the above equation 42, and in each of the stands after F1, the mechanical plate crown is changed to the F3 output side target plate crown. Complete decoupling can be achieved by changing the value equal to the amount. The amount of change of the plate crown of each stand is large in the upstream stand by the thickness of the plate.

[2-2: F3 to F1 stand plate shape ε ₃
~ Control of ε ₁ ] Similarly, control of F3 stand plate shape ε ₃
By setting ξ ₀ = 0, equations (41) to (45) and (40) become equations (87) and (88) to (92) of the following equation 43.

[0120]

[Equation 43]

Since the same applies hereinafter, the derivation of the equation for the control of the F2 and F1 stand plate shapes ε ₂ and ε ₁ will be omitted. Since the case where ξ ₀ = 0 can be completely deinteracted, ε ₀ = 0 is always established. Therefore, it is not necessary to control the F0 stand plate shape ε ₀ (equations (77) to (81) cannot be ξ ₀ = 0).

[3: Example of trial calculation] The above-mentioned arithmetic processing was concretely trial-calculated. Table 1 shows the trial calculation conditions. Case 1 is a case where complete decoupling cannot be performed, and case 2 is a case where complete decoupling is possible.

[0123]

[Table 1]

Tables 2 and 3 summarize the trial calculation results. Tables 2 and 3
Shows the amount of vendor change required to achieve the required amount of crown change for each stand.

[0125]

[Table 2]

[0126]

[Table 3]

[4: Consideration of Trial Calculation Results] [4-1: ScT3 Control (In Case of Increasing ScT ₃ by 0.1%)] In Case 2, the vendor is set so that the F0 to F3 stands both increase the plate crown by 0.1%. By the change, dScT ₃ = 0.1% was achieved in each stand without shape change (that is, in the non-interference state).

In case 1, the vendor is changed so that each stand undergoes a shape change of 0.013% (in the direction of ear distortion). [4-2: ε control (when each of ε _{3 to} ε ₀ is increased by 0.01% (in the ear strain direction))] In case 2, the mechanical plate crown of the stand whose output side shape is to be controlled is increased (=
By changing the vendor in the decrease direction) and in the upstream stand in the opposite direction, we achieved a 0.01% increase in the target stand shape without changing the ScT ₃ and other stand shapes.

In case 1, in addition to the above, the mechanical plate crown of the downstream stand is also changed in the direction opposite to the target stand, and ScT ₃ is unchanged, but the shapes of the other stands are changed. In each case, ScT
If there are only 3 controls, the vendor change amount in the first column of the table may be used independently to control the vendor, and if ε3 control is also performed in addition to ScT3 control, the vendor change amount in the first and second columns The vendor may be controlled according to the result of addition of, and when all the controls are executed, the vendor may be controlled by using the result of horizontally adding the vendor change amounts of all columns. At this time, the mechanical plate crown change amount and the like have added values, but all have only an effect within the expected range.

According to the plate shape / plate crown control method of this embodiment described above, the plate crown can be controlled to the target value without causing deterioration of the plate shape. Further, it is possible to control only the required plate shape of the stand while keeping the output side plate crown constant. As a result, it is possible to reliably manufacture a product having a good plate crown and plate shape, which are important qualities of rolled products.

Further, it is possible to control with the same logic regardless of the presence or absence of the shape meter. That is, even if the shape meters of all the stands are not usable, it is possible to perform feedback control only on the shape of the usable stands, and even when there is no shape meter at all, Sc is maintained while maintaining the shape.
Control of T ₃ can be performed.

Until the shape meter is put into practical use, based on the shape input of each stand by the operator (it is considered that selection of several levels of the ear wave size to the middle expansion level is considered to be sufficient),
It is possible to control with this logic. This has the merit of being able to control only the shape of the required stand while keeping ScT ₃ constant compared to the shape control by the current operator.

In addition, feedback control during rolling,
It can be applied to any preset control by feeding back the rolling condition of the front coil. Then, the desired actuator setting value can be determined by a relatively simple calculation formula.
The present invention is not limited to this embodiment,
It can be realized in various modes without departing from the gist thereof.

For example, the present invention can be applied to a system configured to control the plate crown / plate shape by using a VC roll instead of a vendor, a combination of these, or another form.

[0135]

According to the plate shape / plate crown control method in the hot tandem mill of the present invention described above, the plate crown or plate shape can be easily and reliably adjusted to any desired value. The control does not have an unexpected effect on the other and the results obtained can be intuitively understood.

Further, according to the plate shape / plate crown control device in the hot tandem mill of the present invention, such an advantageous control method can be concretely implemented.
The described configuration is convenient for accurately controlling the plate crown.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a tandem mill of an embodiment.

FIG. 2 is a flowchart as an example of application of a control system.

FIG. 3 is a graph showing document data of shape change coefficient.

[Explanation of symbols]

COM: arithmetic processing unit for mechanical plate crown control, F0 to F3 ... rolling stand, F0a to F3
a, F0b to F3b ... Work roll, F0c to F
3c, F0d to F3d ... Backup roll, F
0e to F3e ... increase vendor, F0f to F3
f, F0g to F3g ... Decrease vendor, Sc ...
-Plate crown meter, ε1 to ε3 ... Plate shape meter.

Claims (5)

[Claims] 1. A plate shape / plate crown control method in a hot tandem mill, wherein each of the plurality of rolling stands has an adjusting means for controlling the plate shape / plate crown of the strip. A process model representing the control characteristics of the strip shape and strip crown is set in advance, the strip crown adjustment amount on the delivery side of the final rolling stand is designated, and the strip crown adjustment amount is set for each rolling stand when the designation is made. Is applied to the process model together with a predetermined condition as a strip shape change pattern to calculate the control amount for each adjusting means of each rolling stand, and the strip shape adjusting amount at any one of the rolling stand exit sides is designated, When the shape adjustment amount is specified, the strip shape change pattern for the other rolling stands and the final rolling stand exit side plate claw The control amount for each adjusting means of each rolling stand by applying it to the process model together with the condition regarding the allowable change amount of the rolling mill, and adding and controlling each calculated controlling amount to drive and control the adjusting means of each rolling stand. Method for controlling plate shape and plate crown in hot tandem mill characterized by: 2. The plate shape / plate crown control method in a hot tandem mill according to claim 1, wherein the change allowable amount of the final rolling stand delivery side plate crown is set to zero. 3. A plate shape / plate crown control device in a hot tandem mill, wherein each of the plurality of rolling stands has an adjusting means for controlling the plate shape / plate crown of the strip. Process model setting means for presetting a process model representing the strip shape and strip crown control characteristics, strip crown adjustment amount designating means for designating strip crown adjustment amount on the delivery side of the final rolling stand, and designation of the strip crown adjustment amount Based on the plate crown adjustment condition setting means preset the plate shape change pattern for each rolling stand in the case where there is a plate crown adjustment condition, the specified plate crown adjustment amount and the set plate crown adjustment condition And the plate clutch that calculates the control amount for each adjusting means of each rolling stand corresponding to the process model. Control amount calculation means for adjusting the strip shape, a strip shape adjustment amount designating means for designating the strip shape adjustment amount on the exit side of one of the rolling stands, and another strip stand when the strip shape adjustment amount is designated. Specific stand plate shape adjustment condition setting means that presets conditions regarding the plate shape change pattern and the allowable change amount of the final rolling stand exit side plate crown as specific stand plate shape adjustment conditions, the specified plate shape adjustment amount and the set Based on the specific stand plate shape adjustment condition, a plate shape adjustment control amount calculation means for calculating a control amount for each adjustment means of each rolling stand corresponding to the process model, and the calculated control amounts are added. It is characterized by comprising a control amount adding means and a drive control means for driving and controlling the adjusting means of each rolling stand based on the added result. Plate-shaped and strip crown control device between the tandem mill. 4. The strip crown adjustment amount designating means comprises strip crown measuring means arranged on the delivery side of the final rolling stand,
The plate shape / plate in the hot tandem mill according to claim 3, further comprising plate crown adjustment amount calculation means for calculating a plate crown adjustment amount from a measurement result of the plate crown measurement means and a target plate crown. Crown control device. 5. The plate in the hot tandem mill according to claim 3 or 4, wherein the specific stand plate shape adjustment condition setting means sets the change allowable amount of the final rolling stand exit side plate crown to zero. Shape / plate crown controller.