KR20090076814A - Thickness control system, thickness control apparatus, and thickness control method - Google Patents

Abstract

A system, an apparatus, and a method for thickness control of sheets are provided to control the sheet thickness with high precision by correcting the mass flow sheet thickness with feed-forward compensation value. A method for thickness control of sheets using a system including a controller(10) and a feed-forward compensation output unit(14) is as follows. A feed-forward compensation value corresponding to the roll speed(VR) of a mill(4) is calculated. The controller compensates mass flow sheet thickness obtained based on the measurement values of sensors with the feed-forward compensation value to estimate mass flow sheet thickness(hMF). The sensors include an entry side sheet thickness meter(7e), an exit side sheet speedometer(8d), and an entry side sheet speedometer(8e). A mass flow sheet thickness control unit(17) controls the sheet thickness to the mill based on the mass flow sheet thickness compensated with the feed-forward compensation value.

Description

Plate thickness control system, plate thickness control device and plate thickness control method {THICKNESS CONTROL SYSTEM, THICKNESS CONTROL APPARATUS, AND THICKNESS CONTROL METHOD}

The present invention relates to a plate thickness control system of a rolling mill, an apparatus thereof, and a method thereof.

Both parts of the rolling material produced by rolling a steel plate (rolling material) with a rolling mill are determined by whether the target plate | board thickness is obtained. In order to obtain a target plate thickness, various control methods are proposed, and for example, Patent Document 1 discloses a technique of plate thickness control using a mass flow constant law.

For example, as described in Patent Literature 1, the mass flow plate thickness is calculated using the mass flow constant law from the feed rate of the conventional rolled material and the plate thickness of the rolled material. And the system which adjusts the roll gap and roll speed of a rolling mill is known so that the deviation of this mass flow plate thickness and the target plate thickness preset may be made small.

[Patent Document 1] Japanese Patent Application Laid-Open No. 9-57317

However, in the sheet thickness control system, for example, as shown in Fig. 2 of Patent Document 1, since the rolling mill and the exit plate thickness detecting means are disposed apart, the exit plate thickness detecting means detects the rolling mill exit plate thickness h. Since waste time occurs, the responsiveness of control is deteriorated.

In addition, since the integral gain at the time of integrating the deviation between the mass flow plate thickness and the rolled rolled material thickness is small when the feed speed of the rolled material is low, the disturbance to the mass flow plate thickness Correction is greatly delayed. Therefore, the rolling mill is controlled using the mass flow plate thickness including an error, and a variation remains in the plate thickness of the rolled rolled material, which takes time until the effect of the feedback control becomes effective.

That is, in the conventional mass flow plate | board thickness control, there exists a problem that plate | board thickness control of favorable responsiveness becomes difficult especially especially when the feed rate of a to-be-rolled material is low speed.

In view of the above problems, it is an object of the present invention to provide a plate thickness control system, apparatus and method capable of controlling plate thickness with high accuracy even in a case where the feed speed of the rolled material is low.

In order to solve the said subject, the mass flow plate thickness is correct | amended by a feed-forward correction amount, It is characterized by the above-mentioned.

According to the present invention, even when the feed speed of the rolled material is low, it is possible to provide a plate thickness control system capable of controlling the plate thickness with high accuracy with good responsiveness.

EMBODIMENT OF THE INVENTION Hereinafter, the best form for implementing this invention is demonstrated in detail with reference to drawings. 1 is a diagram illustrating a plate thickness control system according to the present embodiment. As shown in FIG. 1, the rolling equipment 1 to be controlled by the plate thickness control system 100 includes the rolled material 6 released from the side tension roll 5e on which the rolled material 6 is wound and mounted. It is the structure which cold-rolls with the rolling mill 4, while winding to the exit tension roll 5d.

The rolling mill 4 is provided below the to-be-rolled material 6 and the work roll 4t of the saw side, the intermediate roll 3t, and the back-up roll 2t which are provided in order above the to-be-rolled material 6 in order. The top side work roll 4b, the intermediate roll 3b, and the backup roll 2b which are comprised, and the top side work roll 4t and the bottom side which rotate at predetermined rotational speed (roll speed) VR The rolled material 6 is rolled by the work roll 4b.

The entrance tension roll 5e is driven by a drive means (motor or the like) not shown to loosen the rolled material 6 to be wound and mounted. And the exit tension roll 5d is driven by the drive means (motor etc.) which is not shown so that the to-be-rolled material 6 rolled by the rolling mill 4 may be wound.

The to-be-rolled material 6 which is unwound from the side tension roll 5e enters the rolling mill 4 by adjusting the conveyance direction etc. by the side guide roller 9e. The to-be-rolled material 6 is rolled to the roll gap formed between the work roll 4t of the top side of the rolling mill 4, and the work roll 4b of the bottom side, and is discharged | emitted from the rolling mill 4, and the exit guide roller 9d is carried out. ), The conveying direction and the like are adjusted and wound around the exit tension roll 5d.

On the inlet side of the rolling mill 4, an inlet plate speedometer (inlet plate speed detecting means) 8e for detecting a feed speed at the inlet side of the rolled material 6 is provided, and the rolled material 6 entering the mill 4 is provided. The feed speed of the rolling mill (roller side plate speed V _E ) is detected. Moreover, the exit plate | board speedometer (outlet plate speed detection means) 8d which detects the conveyance speed of the exit side of the to-be-rolled material 6 is provided in the exit side of the rolling mill 4, is discharged | emitted from the rolling mill 4, and the exit tension roll is carried out. feed rate of the confined material (6) wound on a (5d) and detecting (mill exit side sheet speed V _D).

In addition, at the entrance side of the rolling mill 4, a side plate thickness meter (side plate thickness detection means) 7e for detecting the plate thickness (roller side plate thickness H) of the rolled material 6 entering the rolling mill 4 is provided. On the exit side of the rolling mill 4, the exit plate thickness meter (outside plate thickness detection means) 7d which detects the plate thickness (roller exit plate thickness h) of the to-be-rolled material 6 discharged from the rolling mill 4, Is provided.

And in order to control the rolling installation 1, the plate thickness control system 100 is equipped with the control part 10. As shown in FIG. The control unit 10 inputs from the entry plate thickness meter 7e, the exit plate thickness meter 7d, the entrance plate speedometer 8e and the exit plate speedometer 8d so as to roll the rolled material 6 to the target plate thickness. The rolling equipment 1 is controlled by adjusting the roll gaps of the work rolls 4t and 4b on the basis of each detected value (feed rate of the rolled material 6 or sheet thickness).

2 is a block diagram showing feedback control of a rolling mill. As shown in FIG. 2, after the rolled material 6 is rolled by the rolling mill 4 including the work rolls 4t and 4b, the rolling mill exit plate thickness h is detected by the exit plate thickness meter 7d. do.

In the present embodiment, the control unit 10 includes a rolling mill entry plate speed V _E detected by the entry plate speedometer 8e, a rolling mill exit plate speed V _D detected by the exit plate speedometer 8d, and a entry plate thickness meter 7e. The mass flow constant law is applied based on the rolling mill entrance plate thickness H to be detected, and the plate thickness (mass flow plate thickness) of the rolling mill exit side is estimated. The mass flow constant law is expressed by the following equation.

Here, the rolling mill entrance side represents the upstream side of the rolling mill 4 which rolls the to-be-rolled material 6, and the rolling mill exit side shall show the downstream side of the rolling mill 4. As shown in FIG. In addition, the rolling mill inlet thickness H is the feed rate of the confined material (6) entering the rolling mill 4, the rolling is confined material (6) the sheet thickness, the rolling mill inlet plate speed V _E of prior to, the rolling mill (4), the rolling mill the outlet thickness h is the thickness of the confined material (6) rolled in a rolling mill (4), the rolling mill exit side sheet speed V _D shows a the rolling feed rate of the confined material (6) exits the rolling mill (4), respectively.

Therefore, the rolling mill entrance plate speed V _E and the rolling mill exit plate speed V _{D of} the rolled material 6 detected by the entry plate speedometer 8e and the exit plate speedometer 8d are detected by the entry plate thickness meter 7e. From the rolling mill side plate thickness H, the mass flow plate thickness h _{MF of the} to-be-rolled material 6 discharged to the rolling mill exit side can be estimated. That is, the mass flow plate thickness h _MF is expressed by the following expression (2).

Moreover, the control part 10 is equipped with the feedback correction amount calculation part 16, and performs feedback correction. In other words, the feedback correction amount calculation unit 16 masses the deviation between the rolling mill exit plate thickness h detected by the exit plate thickness meter 7d provided by the distance L from the rolling mill 4 and the estimated mass flow plate thickness h _MF. The division divided by the flow plate thickness h _MF is added to 1, and the feedback correction amount (1 + η _FB ) corresponding to the deviation between the rolling mill exit plate thickness h and the mass flow plate thickness h _MF is calculated. Moreover, the control part 10 is equipped with the mass flow correction part 10a, and corrects mass flow plate thickness h _MF by the calculated feedback correction amount.

That is, the mass flow correction part 10a is the rolling mill exit plate thickness h detected by the exit plate thickness meter 7d provided in the exit side of the rolling mill 4, and the mass flow plate thickness h _MF estimated by Formula (2). The mass flow plate thickness h _MF is corrected as shown in the following equation (3) using the feedback correction amount (1 + η _FB ) calculated based on the ratio of.

To η _FB is, the integrated value of the mass-flow thickness h _MF and the rolling mill exit side, and the correction amount for the plate correct the difference between the thickness h, a mass-flow thickness h _MF and a feedback of the rolling mill exit side plates deviation between the thickness h of the equation (3) By this, the mass flow plate thickness h _MF is corrected. Hereinafter, (1 + η _FB ) is referred to as feedback correction amount. Then, the mass-flow thickness h _MF, which is represented by Equation (3), and with a correction by feedback correction mass-flow thickness h _MF.

At this time, the integral gain K for calculating the feedback correction amount is determined depending on the distance L from the rolling mill 4 to the exit plate thickness meter 7d. In other words, the integral gain K is determined based on the time Td required until the rolled material 6 is rolled by the rolling mill 4 and reaches the exit plate thickness meter 7d arranged by a distance L. For example, the integral gain K = 1 / (3Td).

In other words, the integral gain K is set by setting the gain 1/3 and the integral time constant Ti to Td to form the integral term 12.

The magnitude of the integral gain K is a factor for determining the response of control, and the larger the integral gain K, the better the response can be obtained. Therefore, the smaller the integral time constant Ti can obtain the better response.

However, the distance L between the rolling mill 4 and the outgoing plate thickness meter 7d is a distance necessarily generated due to structural factors, and this distance L cannot be eliminated. For example, when the distance L between the rolling mill 4 and the exit plate thickness gauge 7d is 3 m, when the feed speed of the rolled material 6 is a high speed of, for example, 1200 m / min, Td is about 0.15 sec. The integral gain K is about 2.2. However, when the feed speed of the to-be-rolled material 6 is a low speed of 1 m / min, for example, the integral gain K is about 0.002, and it is about 1/1000 at high speed, and control responsiveness deteriorates.

Moreover, when the feed speed of the to-be- ^rolled material 6 is low, the influence of the waste time 11 represented by e- ^Tds becomes large, and a delay generate | occur | produces and this also becomes a factor which worsens responsiveness.

In order to solve such a problem which arises when the feed speed of the to-be-rolled material 6 is a low speed, in this embodiment, the mass flow plate thickness is corrected by adding a feed forward correction amount.

3 is a block diagram showing the configuration of the control unit according to the present embodiment, and shows that the mass flow plate thickness is corrected by the feed forward correction amount. As shown in FIG. 3, the control part 10 which concerns on this embodiment has the feedforward correction amount calculation part 14 which calculates the feedforward correction amount 1+ (eta) _ff . The feed forward correction amount 1 + η _{ff is} referred to, for example, the roll speed VR with the feed forward correction amount calculation unit 14 with reference to a graph G indicating the relationship between the roll speed VR and the feed forward correction amount, and the roll speed. This value is calculated based on VR.

In addition to the feedforward correction amount calculation unit 14, the control unit 10 includes a mass flow plate thickness control unit that performs plate thickness control based on the feedback correction amount calculation unit 16 and the estimated mass flow plate thickness h _MF ( 17).

The feed forward correction amount calculation part 14 tracks to the rolling mill exit plate thickness h of the to-be-rolled material 6 which the rolling speed VR of the rolling mill 4, the exit plate thickness meter 7d detects, and the exit plate thickness meter 7d. The feedback correction amount (1 + η _FB ) calculated by the roll speed VR _(tracking) and the feedback correction amount calculation part 16 which performed was acquired.

In addition, the feedforward correction amount calculation unit 14 stores data indicating the relationship between the roll speed and the feedforward correction amount previously obtained by experiment, calculation, or the like as a graph G, for example, in a storage unit (not shown). In addition, in the memory | storage part which is not shown in figure, several graph G corresponding to each condition is memorize | stored by the difference of working conditions, such as whether or not annealing process (annealing process) is performed, for example, actual working conditions, etc. The feedforward correction amount calculation unit 14 selects the corresponding graph G.

4 is a schematic diagram showing that the feed forward correction amount calculator has different graphs due to differences in set plate thickness, steel grade, and working conditions. In Fig. 4, a plurality of graphs G (G1 to G1) are used as parameters by setting plate thickness, raw material (steel type) of steel sheet as the material to be rolled (see Fig. 3), and the difference in working conditions (with or without annealing as an example). G9) is stored in the feedforward correction amount calculation unit 14. For example, when the steel grade is A and the setting plate thickness is D1, the feed forward correction amount calculation unit 14 is configured to select the graph G1.

In addition, graph G1 includes graph G1- with annealing treatment and graph G1-without annealing treatment, and graph G1 corresponding to the annealing treatment has a feedforward correction amount calculation unit ( 14).

Here, the set plate thickness is a target plate thickness of the rolled material obtained by rolling the rolled material 6 (see FIG. 3), and is set by an unshown setting unit provided in the plate thickness control system 100 (see FIG. 1). , The thickness set by the user. And the board | substrate plate thickness meter 7d shown in FIG. 3 is plate | board thickness detected as rolling mill exit plate | board thickness h.

In addition, the presence or absence of annealing process should just be set as the structure which a user sets by the setting part which is not shown in figure, for example.

Next, the function of the feed-forward correction amount calculation part 14 (refer FIG. 3) is demonstrated. 5 is a view for explaining the function of the feed forward correction amount calculation unit, (a) is a diagram showing the change of the roll speed, and (b) is a block diagram for explaining the function of the feed forward correction amount calculation unit.

As shown to Fig.5 (a), the case where the roll speed VR of the rolling mill 4 (refer FIG. 3) turns into V1 at the time t1.

As shown in FIG. 5B, the feedforward correction amount calculation unit 14 refers to the selected graph G at time t1 and feedforward correction amount 1 + η _{ff (} corresponding to the roll speed V1). _V1) ) _t1 is calculated.

In addition, the feedforward correction amount calculation part 14 is the exit plate thickness meter 7d with which the feedback correction amount calculation part 16 (refer FIG. 3) is provided in the exit side of the rolling mill 4 (refer FIG. 3) at the time t1. (see Fig. 3), the rolling mill exit side, and the plate thickness h, and the feedback correction amount (1 + η _{FB) t1} is calculated based on a ratio of the mass-flow thickness h _MF is estimated by equation (2), the feed-forward is detected by The correction amount 1 + η _{ff (V1) t1} is corrected as shown in the following expression (4).

And it estimates the control unit 10, which, on the basis of the correction amount (1 + η _{FF (V1)) t1} corrected by the feedback correction amount, FF mass-flow thickness h _m as shown in FIG. 3 in the following equation (5) .

In addition, V1 and t1 described in each variable are subscripts which show the value when the roll speed is V1 at the time t1, and are not described in FIG.

The FF mass flow plate thickness h _m is the mass flow plate thickness corresponding to the correction amount 1 + η _{FF (V1} ) _t1 .

Here, V _E represents the rolling mill entrance plate speed detected by the entry plate speedometer 8e (see FIG. 3), and V _D denotes the rolling mill exit plate speed detected by the exit plate speedometer 8d (see FIG. 3). Indicates. In addition, H represents the rolling mill entry board thickness detected by the entry board thickness meter 7e (refer FIG. 3).

In addition, the control unit 10, using, FF mass-flow thickness h _m estimated by the equation (5), estimates the mass-flow thickness h _MF with the following equation (6).

In addition, the control unit 10 estimates the mass flow plate thickness h _{m1 (t1)} corresponding to the feed forward correction amount 1 + η _{ff (V1} ) _t1 calculated by the feed forward correction amount calculation unit 14 by the following equation (7). do.

The mass flow plate thickness h _{m1 (t1)} corresponding to the feed forward correction amount (1 + η _{ff (V1)} ) _t1 does not include the term of the feedback correction amount (1 + η _FB ) _t1 , that is, it is not affected by the feedback correction amount. And the mass flow plate thickness depending only on the feed forward correction amount.

Thus, the control unit 10, the feed forward correction amount calculating section 14 is based on a feed-forward correction value (1 + η _{ff (V1)) t1} calculated at time t1, the mass-flow thickness h _MF, h _m (FF Mass flow plate thickness) and h _{m1 (t1)} are estimated.

(See Fig. 3) As described above, the control unit 10 estimates the mass-flow thickness h _MF corrected feedforward compensation amount, and based on the estimated mass-flow thickness h _MF, mass flow sheet thickness control unit 17 3 (see FIG. 3) adjusts the roll gap of the rolling mill 4 (see FIG. 3) to control the plate thickness, so that the sheet thickness can be controlled responsibly even at a low speed of the feed material 6 (see FIG. 3). Can be. In addition, by constantly updating the mass flow plate thickness h _MF , the plate thickness can be controlled with high accuracy at all times.

Next, the learning function of the control part 10 (refer FIG. 3) is demonstrated. 6 is a block diagram showing a learning function of the controller.

As for the learning function of the control part 10, the mass flow plate thickness h _{m1 (t1)} corresponding to the feed forward correction amount which the feedforward correction amount calculation part 14 estimates at predetermined time t1 is the exit plate thickness meter 7d. It is memorize | stored in the feedforward correction amount calculation part 14 based on the deviation of hm1 _{(t1) (tracking)} tracked to (refer FIG. 3 _), and the rolling mill exit plate thickness h calculated by the exit plate thickness meter 7d. This function updates the graph G.

The graph G which shows the relationship of the roll speed feedforward correction amount stored in the memory part of the feedforward correction amount calculation part 14 which is not shown in figure is a graph determined by the kind of target material 6, target plate thickness, etc., It does not correspond to the individual difference of the serialization 6. Therefore, the error by the individual difference of the to-be-rolled material 6 is included. The learning function of the control part 10 is a function of updating the graph G so that the error which the graph G has by the individual difference of the to-be-rolled material 6 is made small.

The time taken for the estimated mass flow plate thickness h _m1 to be tracked to the exit plate thickness meter 7d (see FIG. 3) is hereinafter referred to as tracking time. The tracking time corresponds to the time until the rolled material 6 (see FIG. 3) rolled by the rolling mill 4 (see FIG. 3) reaches the exit plate thickness meter 7d.

For example, if the predetermined time is time t1 shown in Fig. 5A and the time elapsed by the tracking time from time t1 is t2, then at time t2, as shown in Fig. 6, time t1 is shown. V1 _{(tracking) in} which the roll speed V1 of the tracked to the exit plate thickness meter 7d (see Fig. 3 ₎ is input. Since V1 _(tracking) is the roll speed V1 at time t1, the feedforward correction amount calculation unit 14 refers to the selected graph G, and the feedforward correction amount 1 + η _{ff (V1} corresponding to the roll speed V1). ₎ ) _t1 is calculated.

In addition, the feed forward correction amount calculation part 14 carries out the mass flow plate thickness h _m1 which does not have a term of the feedback correction amount (1+ (eta) _FB ) _{t1 which} the feed forward correction amount calculation part 14 estimates at time t1, and a board | substrate. H _{m1 (t1) (tracking)} tracked to the thickness meter 7d and the rolling mill exit plate thickness h detected by the exit plate thickness meter 7d at time t2 are input.

Then, the feed forward correction amount calculation unit 14 calculates the correction value α as shown in the following expression (8).

As shown in Equation 8, the correction value α is equal to h _{m1 (t1) (tracking) obtained by tracking} the mass flow plate thickness h _{m1 (t1)} estimated by the feedforward correction amount calculation unit 14 at time _t1 to time t2. Is the ratio with the rolling mill exit plate thickness h detected by the exit plate thickness meter 7d (see FIG. 3) at time t2, and the rolling mill exit plate thickness h and the mass flow plate thickness h _{m1 (t1)} at time t2 _{(tracking). ) Is} a value indicating the amount of deviation from

The feedforward correction amount calculation unit 14 uses the correction value α calculated by Equation 8 and the feedforward correction amount 1 + η _{ff (V1} ) _t1 calculated with reference to the graph G. As shown in Fig. 2, the feedforward correction amount 1 + η _{ff (V1} ) _t2 at time _t2 is calculated.

The control unit 10 updates the graph G by the feedforward correction amount 1 + η _{ff (V1} ) _t2 calculated in this way. That is, the feed forward correction amount with respect to the roll speed V1 is substituted by the newly calculated feed forward correction amount (1+ ₍ eta _{) ff (V1)} ) _t2 .

In this way, by sequentially replacing the feed forward correction amount corresponding to the roll speed, the graph G is updated as indicated by broken lines in FIG. 6, for example. Since the graph G is updated with the feed forward correction amount corrected based on the magnitude of the deviation between the rolling mill exit plate thickness h and the mass flow plate thickness h _m1 , the mass flow plate thickness h is the feed forward correction amount calculated with reference to the updated graph G. By correcting _m1 , it can be corrected to a value close to the actual rolling mill exit plate thickness h.

In other words, the deviation between the rolling mill exit plate thickness h detected by the exit plate thickness meter 7d (see FIG. 3) and the mass flow plate thickness h _MF corrected by the feed forward correction amount calculated by the feed forward correction amount calculation unit 14. The feedforward correction amount so that is 0 is calculated, and the graph G is updated.

What is necessary is just to set learning gain (beta) in Formula (9) suitably as a numerical value which shows the grade of a change. Increasing the learning gain β increases the influence of the correction value α on the feed forward correction amount 1 + η _{ff (V1} ) _t2 . That is, when the learning gain β is large, the graph G is changed to a high gain with respect to the magnitude of the deviation represented by the correction value α, and therefore the graph G is corrected to the correction value α in a short time.

FIG. 7 is a diagram illustrating an embodiment in which the feedforward correction amount calculation unit calculates the feedforward correction amount with reference to the updated graph.

As shown in FIG. 7, when the roll speed is V1, the feed forward correction amount calculation unit 14 refers to the updated graph G (indicated by the solid line in the drawing), and the feed forward correction amount corresponding to the roll speed V1. (1 + _{ηff (V1)} ) _t2 is calculated. And the control part 10 (refer FIG. 3) is time _t2 which the feedback correction amount calculation part 16 (refer FIG. 3) calculates using the calculated feed forward correction amount (1+ ₍ eta _{) ff (V1)} ) _t2 . The feed forward correction amount (1 + η _{FF (V1)} ) _t2 updated by the feedback correction amount (1 + η _FB ) _t2 at is calculated based on the equation (6).

Thus, the control part 10 (refer FIG. 3) has a learning function, and responds to a roll speed by sequentially updating the graph G (refer FIG. 3) memorize | stored in the feed-forward correction amount calculation part 14 (refer FIG. 3). The feed forward correction amount to be corrected is obtained, so that an appropriate feed forward correction amount reflecting the state of the rolled material 6 (see FIG. 3) can be obtained. And by using the mass flow plate thickness corrected by the appropriate feed forward correction amount, plate | board thickness can be controlled with high precision at all times.

Moreover, the outstanding effect that it can respond also to the error which arises, for example by the replacement of the components which comprise the rolling installation 1 (refer FIG. 1), and a secular variation is exhibited.

As mentioned above, although the rolling equipment which has one rolling machine as shown in FIG. 1 was demonstrated, it is also possible to apply this embodiment to the rolling equipment which arranged several rolling mills in series. 8 is a diagram illustrating a rolling facility consisting of three rolling mills.

The rolling installation 1a shown in FIG. 8 is equipped with the shear rolling mill 40 in the entrance side of the center rolling mill 41 which performs plate | board thickness control, and the rear end rolling mill 42 in the exit side of the rolling mill 41 of the center. Equipped. The other structure is equivalent to the rolling installation 1 and the plate | board thickness control system 100 shown in FIG. 1, and detailed description is abbreviate | omitted suitably.

For example, as shown in FIG. 8, in the rolling installation 1a provided with the shear mill 40 at the entrance side of the center rolling mill 41 which performs plate | board thickness control, and the rear-end rolling mill 42 at the exit side. When applying this embodiment, the control part 10 is based on each detected value of the entry board thickness meter 7e, the exit plate speedometer 8d, and the entry plate speedometer 8e of the center rolling mill 41, The exit mass flow plate thickness h _MF of the rolling mill 41 is estimated. And it correct | amends by the feed forward correction amount computed by the feed forward correction amount calculation part 14 (refer FIG. 3) with which the control part 10 is equipped. In addition, the plate | board thickness with respect to the rolling mill 41 of the center is based on the mass flow plate thickness _hMF which the mass flow plate thickness control part 17 (refer FIG. 3) with which the control part 10 is equipped with the feed-forward correction amount was correct | amended. Take control.

In the case of performing plate thickness control on the central rolling mill 41 here, in the rolling installation 1a having a plurality of rolling mills, the work roll speed of the shear rolling mill 40 (roll speeds of the work rolls 4b and 4t) Adjust

That is, although not shown, the mass flow plate thickness control part 17 shown in FIG. 3 is connected with the shear rolling mill 40 through a signal line, for example, and it is comprised so that the work roll speed of the shear rolling mill 40 can be controlled. do.

In addition, the mass flow plate thickness control part 17 memorize | stores the relationship of the mass flow plate thickness h _MF corrected by the feed-forward correction amount, and the work roll speed of the shear rolling mill 40 in table data format, for example.

Then, the mass flow plate thickness control unit 17 refers to the table data, calculates the work roll speed of the shear rolling mill 40 corresponding to the mass flow plate thickness h _MF corrected by the feed forward correction amount, and the shear rolling mill 40. The work roll speed at which the work roll speed is calculated is controlled.

Thus, also in the rolling installation which arranged several rolling mills in series, the same plate | board thickness control as the rolling installation which consists of one rolling mill is possible, and the same effect can be acquired.

1 is a diagram illustrating a plate thickness control system according to the present embodiment.

2 is a block diagram showing feedback control of a rolling mill.

Fig. 3 is a block diagram showing the configuration of a control unit according to the present embodiment, showing the correction of the mass flow plate thickness by the feed forward correction amount.

4 is a schematic diagram showing that the feed forward correction amount calculation unit has different graphs due to differences in set plate thickness, steel grade, and working conditions;

Fig. 5A is a diagram showing a change in roll speed, and Fig. 5B is a block diagram for explaining the function of the feedforward correction amount calculation unit.

6 is a block diagram showing a learning function of a controller.

FIG. 7 is a diagram illustrating an embodiment in which the feed forward correction amount calculation unit calculates a feed forward correction amount with reference to the updated graph. FIG.

The figure which shows the rolling equipment which consists of three rolling mills.

<Explanation of symbols for the main parts of the drawings>

1, 1a: rolling equipment

4: rolling mill

6: rolled material

7d: exit plate thickness meter (outside plate thickness detection means)

7e: entry plate thickness meter (side plate thickness detecting means)

8d: exiting plate speedometer (outside plate speed detecting means)

8e: entry plate speedometer (side plate speed detection means)

10: control unit

14: feed forward correction amount calculation unit

16: feedback correction amount calculation unit

100: plate thickness control system

H: Rolling mill side plate thickness

h: rolling mill exit plate thickness

h _MF : mass flow plate thickness

G: graph

V _E : Rolling mill entering plate speed

V _D : Rolling mill exit plate speed

VR: Roll Speed

Claims (5)

An entry plate speed detection unit for detecting a rolling mill entry plate speed of the rolled material to be rolled by a rolling mill; An entry plate thickness detection unit for detecting a rolling plate entry plate thickness of the rolled material; An exit plate speed detector for detecting a rolling plate exit plate speed of the rolled material; An exit plate thickness detector for detecting a roll exit plate thickness of the rolled material; The rolled sheet exiting plate thickness and the estimated rolling mill thickness detected by the exiting plate thickness detector are estimated by using the detected values of the entrance plate speed detector, the exit plate speed detector, and the entrance plate thickness detector. A control unit for calculating a feedback correction amount for the deviation from one plate thickness and performing plate thickness control while correcting the estimated plate thickness with the feedback correction amount Plate thickness control system having a The control unit includes a feedforward correction amount calculation unit that calculates a feedforward correction amount corresponding to the roll speed of the rolling mill, and the feedforward correction amount that the feedforward correction amount calculation unit calculates the estimated sheet thickness corrected by the feedback correction amount. Plate thickness control system, characterized in that for correcting. The method of claim 1, The said control part estimates the plate | board thickness of the said rolling mill exit side by the mass flow constant side using each detection value of the said entry board speed detection part, the said exit board speed detection part, and the said entry board thickness detection part. Control system. The method of claim 1, The feed forward correction amount calculation unit has a graph indicating a relationship between the roll speed of the rolling mill and the feed forward correction amount therein, and calculates the feed forward correction amount with reference to the graph, and the rolled material rolled by the rolling mill. The feedforward correction amount for tracking the rolling mill exiting plate thickness of the rolling mill until the exiting plate thickness detection unit detects the error in the rolling mill exiting plate thickness and the estimated sheet thickness corrected by the feedforward correction amount is 0. And calculating and updating the graph with the calculated feed forward correction amount. The rolling mill exit plate thickness detected by the exit plate thickness detecting means and the rolling plate exiting plate thickness estimating means are estimated by using the detected values of the entering plate speed detecting means, the exiting plate speed detecting means, and the entering plate thickness detecting means. By calculating the feedback correction amount for the deviation from the estimated plate thickness, and instructing the plate thickness control while correcting the estimated plate thickness with the feedback correction amount, A feed forward correction amount calculation unit for calculating a feed forward correction amount corresponding to the roll speed of the rolling mill, and correcting the estimated sheet thickness corrected by the feedback correction amount to the feed forward correction amount calculated by the feed forward correction amount calculation unit; Plate thickness control device characterized by the above-mentioned. The sheet thickness at the exit side of the rolling mill is estimated using the input plate speed, the output plate speed, and the input plate thickness, and the feedback correction amount for the deviation between the output plate thickness and the estimated plate thickness is calculated, and the estimated plate thickness is calculated. As a plate thickness control method for outputting a command of plate thickness control while correcting to the feedback correction amount, And calculating the feed forward correction amount corresponding to the roll speed, and correcting the estimated sheet thickness corrected by the feedback correction amount with the feed forward correction amount.

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