KR101204180B1 - Control apparatus of hot rolling line - Google Patents

Abstract

[assignment]
Realize the desired rolling time. Moreover, the control apparatus of the hot rolling line which can suppress energy consumption is provided.
[Solution]
The initial schedule calculation device which calculates the flow pattern of the cooling spray and the speed pattern of the rolling speed, and the flow rate of the cooling spray are corrected, and only the modification of the flow rate of the cooling spray can make the finish mill exit temperature the target value over the entire length of the target rolled material. A schedule correction device for correcting the speed pattern when there is no number and a speed change rate relating to the speed pattern, a rolling time prediction calculation device for calculating the rolling time required for the target rolled material using the speed pattern; The rolling time adjustment device outputs the speed change rate calculated so that the rolling time required to be within the target rolling time to the schedule correction device, and the energy consumption obtained by time integration of the rolling power calculated using the speed pattern. Build an energy consumption regulator that outputs the rate of change to the schedule modification device. Compared.

Description

Control device of hot rolling line {CONTROL APPARATUS OF HOT ROLLING LINE}

TECHNICAL FIELD This invention relates to the control apparatus of the hot rolling line which manufactures a metal product.

Usually, a hot rolling line is the heating apparatus which heats a to-be-rolled material, the rough mill and the finishing mill which rolls a heated to-be-rolled material, the cooling apparatus which cools a to-be-rolled material, and rolling It consists of a winding machine which winds up the to-be-rolled material to a coil shape.

The temperature history of the rolled material in the hot rolling line affects the material (mechanical properties) of the rolled material. Moreover, the temperature of the to-be-rolled material in a rolling process changes the hardness of a to-be-rolled material, and greatly affects the energy consumption required for a rolling process. For this reason, a thermometer is arrange | positioned by the density measurement side of a hot rolling line, the entry side of a finish mill, the exit side of a finish mill, etc., and temperature measurement is performed.

In order to realize the material desired for a to-be-rolled material, the atmospheric temperature in a heating furnace is adjusted and a to-be-rolled material is heated. The extraction interval time, which represents the time from when one rolled material is extracted from the heating furnace to the next rolled material is extracted from the heating furnace, is used in order to achieve the maximum production pitch. It is determined from the prediction. For example, the extraction interval time is determined so that the first rolled rolled material and the subsequent rolled material are the shortest gaps that do not collide on the hot rolling line.

At this time, by adjusting the flow rate of the cooling spray (hereinafter referred to as "ISC") provided between the rolling stands of the finish mill, and the rolling speed at which the rolled material is conveyed in the finish mill, over the entire length of the rolled material. , The target temperature of the rolled material on the finish mill exit side is achieved and maintained.

As mentioned above, in the rolling process of a to-be-rolled material, a rolling schedule is planned in consideration of the material and the production quantity of a product, and a hot rolling line is controlled. The finish mill exit temperature (hereinafter referred to as "FDT") needs to be controlled to a designated target value in order to secure the material of the product. Moreover, the phenomenon called "thermal run-down" in which the temperature of a to-be-rolled material falls gradually from the front-end | tip of a to-be-rolled material toward the end of the to-be-milled edge part occurs. Therefore, in order to maintain the FDT at the target temperature over the entire length of the rolled material, it is necessary to adjust the ISC flow rate while accelerating over the entire length of the rolled material.

On the other hand, in order to increase the yield of the product, it is necessary to shorten the extraction interval time of the rolled material. In order to shorten an extraction interval time, it is necessary to raise a rolling speed in the range which a to-be-rolled material does not collide with on a hot rolling line. In general, however, when the metal material is deformed, even if the strain to be applied is the same, the higher the strain rate, the higher the stress (strain resistance) required for the deformation. For this reason, when the rolling speed is raised, the energy consumption required for rolling increases.

Therefore, the rolling speed needs to be increased as much as possible in order to increase the production in the range in which the FDT can be controlled to the target value, and as much as possible in order to reduce the energy consumption.

As a method of suppressing the energy consumption, for a hot rolling line in which a heating device is provided in front of the finishing mill, finishing is performed so that the energy consumption determined from the maximum speed of rolling by the finishing mill and the temperature increase amount of the heating device is minimized. A method of determining the maximum rolling speed in the mill and the temperature increase amount of the heating apparatus has been proposed (see Patent Document 1, for example). However, in the method proposed in Patent Document 1, it is not considered that the yield decreases by lowering the rolling speed.

Further, as a method of predicting and calculating the energy consumption, the rolling time per rolled material is predicted based on the performance data of the rolling treatment, the rolling time for each rolled material is predicted from the slab data in the furnace, and the rolled material 1 A method of predicting the rolling power for each piece based on the rolling work amount and predicting the energy consumption of the rolling mill has been proposed (see Patent Document 2, for example). However, in the method proposed in Patent Document 2, the influence on the energy consumption due to the change of the rolling speed is not considered.

[Patent Document]

Patent Document 1: Japanese Patent No. 3444267

Patent Document 2: Japanese Patent Application Laid-Open No. 64-15201

By reducing the rolling speed in order to suppress the energy consumption in the hot rolling line, it is possible that the rolling time required increases and the extraction interval time necessary for achieving the target production amount cannot be secured. On the other hand, although the target rolling time can be realized by raising the rolling speed, there is a problem that the energy consumption increases.

In view of the above problems, an object of the present invention is to provide a control device for a hot rolling line that can achieve a desired rolling time and can suppress an energy consumption.

According to one aspect of the present invention, there is provided a control apparatus for a hot rolling line including a heating furnace and a finishing mill having a cooling spray disposed between a plurality of rolling stands and a plurality of rolling stands that are continuously arranged, wherein (a) An extraction interval calculating device for calculating an extraction interval time for extracting a plurality of rolled materials from a heating furnace based on operation information including a rolling processing schedule for a plurality of rolled materials to be rolled, and (b) an extraction interval time And a target rolling time calculating device for calculating a target rolling time of the target rolled material, which is one of the plurality of rolled materials, and (c) the flow rate of the cooling spray and the target rolled material based on the operation information. An initial schedule calculation device for calculating the speed pattern of the rolling speed conveyed by the hot rolling line, and (d) correcting the flow rate of the cooling spray, and further cooling A schedule correction device for correcting the speed pattern when the finish flow exit temperature cannot be set as the target value over the entire length of the target rolled material only by correcting the flow rate of the frame, and when the rate of change of the speed pattern is input; (ㅁ) a rolling time prediction calculation device that calculates the rolling time required of the target rolled material using the speed pattern, and (iii) the speed change rate is calculated so that the rolling time is within the target rolling time, and the calculated speed change rate The rolling time adjusting device outputting the output to the schedule correction device and (s) the rolling power at a plurality of target points set in the hot rolling line are calculated using the speed pattern, and the energy consumption obtained by time integration of the rolling power is minimized. An energy consumption adjustment device for outputting the calculated speed change rate to the schedule correction device, and the rolling time required In the table a range greater than the rolling time, the energy consumption of the control device for determining the flow rate and the speed pattern of the cooling spray is minimized is provided.

Advantageous Effects of Invention According to the present invention, it is possible to provide a control device for a hot rolling line that can realize a target rolling time and can suppress energy consumption.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structure of the control apparatus which concerns on 1st Embodiment of this invention.
It is a schematic diagram which shows the structural example of a hot rolling line.
3 is a flowchart for explaining a method for calculating a control reference value by the control device according to the first embodiment of the present invention.
It is a schematic diagram which shows the structural example of the rolling mill periphery of the hot rolling line shown in FIG.
5 is a schematic diagram showing a segment number and a target point number of a rolled material.
6 is a conceptual diagram for explaining a method for determining a rolling time by a control device according to a first embodiment of the present invention.
The schematic diagram which shows the change of rolling power in the longitudinal direction of a to-be-rolled material.
8 is a flowchart for explaining an example of procedure calculation when the flow rate of the cooling spray is changed by the control device according to the first embodiment of the present invention.
9 is a conceptual diagram for explaining an example of a speed correction method by the control device according to the first embodiment of the present invention.
10 is a flowchart for explaining a method for determining an extraction interval time by a control device according to a second embodiment of the present invention.
It is a schematic diagram which shows the structure of the control apparatus which concerns on 4th Embodiment of this invention.

Next, the first to fourth embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. The embodiment shown below illustrates the apparatus and method for incorporating the technical idea of this invention, and embodiment of this invention does not specify the thing of the structure, arrangement | positioning, etc. of a component. Embodiment of this invention can add various changes in a claim.

(First embodiment)

The control apparatus 10 of the hot rolling line which concerns on 1st Embodiment of this invention is a control apparatus of the hot rolling line 20, as shown in FIG. 1, The operation condition processing apparatus 11 and extraction interval. Calculation apparatus 12, target rolling time calculation apparatus 13, initial schedule calculation apparatus 14, schedule correction apparatus 15, rolling time prediction calculation apparatus 16, rolling time adjustment apparatus 17, energy consumption adjustment Apparatus 18 is provided.

The hot rolling line 20 controlled by the control apparatus 10 is equipped with the finishing mill which has a heating furnace and the cooling spray arrange | positioned between the some rolling stand and the several rolling stand arranged continuously. Before explaining the detail of the control apparatus 10, the hot rolling line 20 is demonstrated with reference to FIG. The hot rolling line 20 shown in FIG. 2 has the heating furnace 21, the dense 23, the finishing mill 26, and the winding machine 28. As shown in FIG. 2 shows a state in which the rolled material 100 is carried out from the heating furnace 21.

The rolled material 100 extracted from the heating furnace 21 is rolled by the reversible density 23. The dense 23 usually has one to several rolling stands, and is passed through the dense 23 several times while reciprocating the material to be rolled, so that the intermediate bar aimed at the dense exit side. Rolled up to the plate thickness. Passing the rolled material 100 through the rolling stand of the dense 23 is referred to as a "pass" below.

After rolling in the dense 23, the to-be-rolled material 100 is conveyed from the dense 23 exiting side to the finishing mill 26 entrance side, for example, the finishing which consists of 5-7 rolling stand 260. The mill 26 is rolled to a desired product sheet thickness. Between the rolling stands 260 of the finishing mill 26, the cooling spray (ISC) which is not shown in FIG. 2 is provided.

In addition, as shown in FIG. 2, the dense entry descaler 22 is disposed at the entrance side of the dense 23, and the finish mill entry descaler 25 is disposed at the entrance side of the finishing mill 26. Moreover, the coil box 24 is arrange | positioned in the conveyance table area between the dense 23 and the finishing mill 26. As shown in FIG.

The to-be-rolled material 100 carried out from the finishing mill 26 is wound in the coil shape by the winding machine 28, after cooling by the cooling apparatus 27. As shown in FIG. The cooling apparatus 27 is a water cooling apparatus, for example.

Moreover, according to the conveyance direction of the to-be-rolled material 100 of the hot rolling line 20, several thermometers, such as the dense exit thermometer 291, the finish mill entry thermometer 292, and the finish mill exit thermometer 293, are arrange | positioned, have. The temperature of the to-be-rolled material 100 in each position of the hot rolling line 20 is measured by these thermometers.

Next, the control apparatus 10 shown in FIG. 1 is demonstrated.

The operation condition processing device 11 outputs an operation condition PDI necessary for the extraction interval calculation device 12 and the initial schedule calculation device 14 from the input operation information. The operation information is input to the control device 10 as an operation instruction set for realizing a desired production amount, input information designated by an operator, or the like. The operation information includes a rolling processing schedule for a plurality of rolled materials to be rolled, for example, a target value of the FDT, a sheet thickness and a sheet width of the product, and a slab introduced into the heating furnace 21. Plate thickness? Information including the length, the extraction temperature of the heating furnace 21, and the like.

The extraction interval calculation device 12 extracts the extraction interval time t _EX of the rolled material 100 sequentially extracted from the heating furnace 21 based on the operating conditions (PDI) such as the number of workpieces and the total processing time. ) Is calculated. The extraction interval time t _EX is a time from one to-be-rolled material 100 to be extracted from the heating furnace 21 and then to the next to-be-rolled material 100 to be extracted from the heating furnace 21.

The target rolling time calculation device 13 uses the extraction interval time t _EX and the rolling speed information included in the operation information and the like to target the rolled material 100 to be processed in the hot rolling line 20. The rolling time t _Tar is calculated.

The initial schedule calculation device 14 calculates the initial value SV0 of the control reference value necessary for achieving the target plate thickness and the rolled material temperature on the finish milling side, based on the operating conditions PDI. Specifically, the roll gap required for rolling, the flow rate of the cooling spray (ISC) arranged in the hot rolling line 20, and the speed of the rolling speed at which the rolled material 100 to be processed conveys the hot rolling line 20 Calculate the pattern.

The schedule correction apparatus 15 corrects the flow rate of the ISC so as to achieve the target finish close-out temperature (target FDT) over the entire length of the rolled material 100. In addition, when only the correction | amendment of the flow rate of ISC is not able to match a target value over the whole length to the target value over the whole length, the speed pattern of a rolling speed is corrected. Or when the speed change rate ((alpha) _V ) regarding the speed pattern of a rolling speed is input, the speed pattern of a rolling speed is correct | amended using the input speed change rate ((alpha) _V ).

The flow rate and speed pattern of the modified ISC are output to the hot rolling line 20 as a control reference value SV for controlling the hot rolling line 20. For example, the flow rate of ISC is output to the actuator which controls the flow volume by adjusting the valve of the ISC arrange | positioned at the hot rolling line 20, and the speed pattern is a roll of the rolling stand 260 of the finishing mill 26. Is output to the drive that drives it.

The rolling time prediction calculation device 16 calculates the rolling time required t _rm of the rolled material 100 using the speed pattern included in the control reference value SV determined by the schedule correction device 15.

The rolling time adjusting device 17 measures the rolling time required t _rm calculated by the rolling time prediction calculating device 16 and the target rolling time t _Tar calculated by the target rolling time calculating device 13. Compare. And the speed change rate ((alpha) _V ) of a rolling speed | rate is computed so that rolling required time t _rm may be within target rolling time t _Tar . The calculated speed change rate α _V is output to the schedule correction device 15.

The energy consumption adjustment device 18 calculates rolling power at a plurality of calculation points set in the hot rolling line 20 based on the speed pattern calculated by the schedule correction device 15, and calculates the calculated rolling power in time. Integrate to calculate energy consumption. Rolling power is computed using the drive current etc. of the motor which drives a rolling stand. In addition, when the energy consumption amount can be reduced, the energy consumption adjustment device 18 calculates the speed change rate α _V so as to minimize the energy consumption amount, and outputs it to the schedule correction device 15.

As described above, in the control apparatus 10 shown in FIG. 1, the flow rate of the ISC and the hot rolling line (ISC) are minimized under the condition that the rolling time t _rm is within the target rolling time t _Tar . The speed pattern of the rolling speed of the to-be-rolled material 100 conveyed 20 is determined.

Below, an example of the method of controlling the hot rolling line 20 by the control apparatus 10 shown in FIG. 1 is demonstrated with reference to FIG. In Fig. 3, the flow chart 31 on the left side shows the calculation method of the rolling campaign. A "rolling campaign" is a unit of the to-be-rolled material which rolling process is planned continuously, for example, is a unit of the to-be-rolled material which rolling process is scheduled until the roll exchange of the hot rolling line 20. As shown in FIG. The flowchart 32 on the right side of FIG. 3 shows the calculation method of the target to-be-rolled material 100 [a] which is one of the some to-be-rolled material to be processed in the hot rolling line 20. As shown in FIG. The target to-be-rolled material 100 [a] is a to-be-rolled material for which the rolling process is scheduled for the ath time as the object of preparation of the flow rate and speed pattern of ISC.

First, the process shown in the flowchart 31 is demonstrated.

In step S311, operation condition PDI in the rolling campaign sent from the operation condition processing apparatus 11 is input into the extraction interval calculation apparatus 12. FIG.

In step S312, the extraction interval calculation apparatus 12 calculates extraction interval time t _EX [a] based on operation condition PDI. The extraction interval time t _EX [a] is determined based on the rolling campaign and the furnace operation conditions, not for each rolled material. In addition, code | symbol [a] shows that it is a numerical value with respect to the target to-be-rolled material 100 [a] (it is the same below).

The extraction interval time t _EX [a] is, for example, injected into the heating time and the heating furnace 21 of the material to be rolled or in the case where the heating time in the heating furnace 21 is determined. It is decided by the time predicted to become.

The number of times (P) of the rolling campaign or the unrolled to-be-rolled material 100 and the time required for rolling both of the to-be-rolled materials (hereinafter referred to as "target total rolling time" (T _Tgt ), the extraction interval time t _EX [a] of the target to-be-rolled material 100 [a] is calculated by the following equation (1);

t _EX [a] = t _Tgt / P + f (FDTa [a], SGF [a], dh [a], l [a]). (One)

Right side 2 of Equation (1) is the correction term and is expressed as a function of target finish mill exit temperature (FDTa), grade classification (SGF), total rolling reduction (dh), and roll length (l). do. These numerical values are predetermined.

Since the sum total of the extraction interval time t _EX [a] needs to be equal to the target total rolling time t _Tgt , the relationship of the following formula (2) and formula (3) is satisfied.

t _Tgt = Σt _EX [a]. (2)

? (F (FDTa [a], SGF [a], dh [a], l [a])) = 0. (3)

In formula (2) and formula (3), (Σ) represents the sum total from a = 1 to P.

Next, in step S313, the target rolling time calculation device 13 calculates the target rolling time t _Tar . The target rolling time t _Tar is calculated based on the rolled material in the rolling campaign. The calculation method of the target rolling time t _Tar is shown below.

The target rolling time t _Tar [a] of the target to-be-rolled material 100 [a] scheduled for rolling in the a-th is next to the a + 1 th rolled material (100 [a + 1]) scheduled to be rolled. It needs to be rolled without sticking. Therefore, the target rolling time t _Tar [a] of the target to-be-rolled material 100 [a] is calculated by the following formula (4).

t _Tar [a] = t _EX [a + 1] + t _R [a + 1]. (4)

In Formula (4), t _R [a] is the finish mill rolling start position arrival time of the target to-be-rolled material 100 [a]. "Finish-mill rolling start position arrival time" is time from the target to-be-rolled material 100 [a] to be extracted from the heating furnace 21, and to reaching finish-mill rolling start position. Although the "finish rolling start position" can be arbitrarily set, for example, when the target to-be-rolled material 100 [a] becomes too close to the preceding preceding to-be-rolled material 100 [a-1], the object It is set to the position where the to-be-rolled material 100 [a] waits.

The finish mill rolling start position arrival time t _R [a] is represented by the following formula (5);

t _R [a] = Σt _Rr [n] [a] + Σt _T [n] [a] + t _TFM [a]. (5)

In formula (5), Σ represents the total from n = 1 to N _R. N _R is the number of rolling stands of the dense 23. In addition, t _Rr [n] is the rolling time required at the n-th rolling stand of the dense 23, t _T [n] is the n-th stand side feeding time of the dense 23, and t _TFM is the Last stand exit return time.

The finish mill rolling start position is located on the upstream side of the hot rolling line 20 rather than the finish mill 26. For this reason, the speed at the time of the rolling by the density 23 which is a process upstream from the finish mill rolling start position, and the speed to which a to-be-rolled material are conveyed are not influenced by temperature control. Therefore, at this stage, the finish mill rolling start position arrival time t _R [a] can be accurately predicted.

In the case of sticking along the vehicle during the rolling by the dense 23, it is necessary to change the rolling speed of the target rolled material 100 [a] or the vehicle. For this purpose, in the m-th rolling stand of the dense 23, it is necessary to satisfy the conditions of the following formula (6);

Σ _m t _Rr [n] [a] + Σ _m t _T [n] [a] ≤t _EX [a + 1] + Σ _m-1 t _Rr [n] [a + l] + Σ _m t _T [ n] [a + l]... (6)

In Formula (6), Σ _m represents the total from n = 1 to m, and Σ _m-1 represents the total from n = 1 to m-1.

The extraction interval time t _EX [a] and the finish mill rolling start position arrival time t _R [a] of each rolled material 100 calculated so far are required to be rolled by the rolling time adjustment device 17. It is used for the comparison between the time t _rm and the target rolling time t _Tar .

By the above, the process shown in the flowchart 31 is complete | finished.

As described above, at the timing of performing the calculation shown in the flow chart 31 for the rolling campaign, the calculation of the target rolling time t _Tar is performed in advance. In addition, when the rolling speed and the extraction interval time t _EX are changed by manual intervention by an operator or the like, it is necessary to recalculate the target rolling time t _Tar .

Next, the process shown by the flowchart 32 with respect to target to-be-rolled material 100 [a] is demonstrated. The timing for performing calculation on the target to-be-rolled material 100 [a] is performed at an arbitrary timing before rolling the target to-be-rolled material 100 [a].

In step S321, the initial schedule calculation apparatus 14 receives the operation condition PDI of the target to-be-rolled material 100 [a] transmitted from the operation condition processing apparatus 11. FIG.

In step S322, the initial schedule calculation apparatus 14 performs schedule calculation based on an operating condition PDI. In the schedule calculation, in order to achieve the target plate thickness and the rolling material temperature at the finish mill exit side, the roll gap required for rolling, the flow rate of the cooling water, and The speed pattern etc. during rolling of the finish mill 26 of the to-be-rolled material 100 are determined.

In FIG. 4, the finishing mill schedule calculation area which is a target of the schedule calculation regarding the finishing mill 26 is shown. In order to predict the temperature of the target to-be-rolled material 100 [a], in consideration of the influence of the flow rate of the ISC 265 provided between the stands of the finishing mill 26, the finishing mill exiting from the finishing mill entry thermometer 292. Until the thermometer 293, the temperature drop calculation is performed by the initial schedule calculation device 14.

At this time, the flow rate of the ISC 265 necessary for achieving the target FDT at each position in the longitudinal direction of the target to-be-rolled material 100 [a] by thermal run down or acceleration / deceleration of the target-to-roll material 100 [a]. This is different. For this reason, it is necessary to perform temperature drop calculation for every calculation point of the longitudinal direction of the target to-be-rolled material 100 [a]. This calculation point is called "target point" below. 5A to 5C show segment numbers and target point numbers of the rolled material 100.

5 (a) shows the rolled material 100, the right end of the drawing is the leading end, and the left end of the drawing is the far end. In order to clearly show the arbitrary point of the to-be-rolled material 100 in the longitudinal direction, the unit which divided | segmented the to-be-rolled material 100 at equal intervals is called a segment. 5B illustrates a segment of the rolled material 100. For simplicity, the segment numbers are assigned in sequence from the tip to the end of the rolled material 100. 5 (c) shows a target point number. Points important to the target points 0 to M are selected in the rolling process. The target point is set to, for example, a point to be bitten in, a middle point at which the rolling speed is greatest, and a short point at which the temperature is lowered.

In steps S323 to S325 of FIG. 3, the flow rate of the ISC 265 and the following 5 may be achieved so that the schedule correction device 15 can achieve the target FDT over the entire length of the target rolled material 100 [a]. Calculate the speed pattern.

In step S323, the schedule correction apparatus 15 calculates the flow volume of the ISC 265 so that a target FDT may be achieved. For that purpose, the temperature drop calculation is performed by changing the flow rate of the ISC 265, and the convergence calculation is performed so that the calculated FDT coincides with the target FDT. The details of the procedure calculation when the flow rate of the ISC 265 is changed will be described later.

If the target FDT cannot be achieved even by applying the flow rate of the ISC 265 obtained by the above-described procedure, it is necessary to change the speed pattern of the rolling speed to achieve the target FDT. Specifically, when the flow rate of the ISC 265 is corrected, and at least one of the target points cannot achieve the target FDT, the schedule correction device 15 determines the target rolled material 100 [a] in step S324. It is determined that the target FDT cannot be achieved over the entire length. In this case, in order to achieve a target FDT by changing the speed pattern, in step S325, the schedule correction device 15 corrects the speed pattern of the rolling speed. The detail of the speed pattern correction method is mentioned later.

After correcting the speed pattern, the process returns to step S323 and the flow rate of the ISC 265 is calculated again using the corrected speed pattern. By repeating steps S323 to S325, the speed pattern for achieving the target FDT over the entire length of the target to-be-rolled material 100 [a] is determined.

Next, in step S326, the rolling time prediction calculation apparatus 16 calculates the rolling required time t _rm [a] of the target to-be-rolled material 100 [a]. The rolling time t _rm [a] is represented by the following formula (7);

t _rm [a] = t _R [a] + t _F [a]. (7)

In the formula (7), t _F [a] is the rolling time (hereinafter referred to as “finishing”) after the end of the finish mill rolling start until the end of the target rolled material 100 [a] falls out of the finish mill 26. Mill rolling time ”.

In step S326, the rolling required time t _rm [a] is calculated from the speed pattern corrected by the schedule correction device 15. As shown in equation (7), the sum of the finish mill rolling start position arrival time t _R [a] and the finish mill rolling time t _F [a] calculated by the formula (5) takes rolling. Time t _rm [a].

Subsequently, in steps S327 to S329, the rate of change rate α _V is set by the rolling time adjusting device 17 such that the rolling time t _rm [a] is within the target rolling time t _Tar [a]. Is calculated.

In step S327, it is determined whether the rolling time required t _rm [a] calculated in step S326 is within the target rolling time t _Tar [a]. 6 (a) to 6 (c) show a conceptual diagram of the method for determining the rolling time.

FIG. 6 (a) shows the state of timing at which the target to-be-rolled material 100 [a] is extracted from the heating furnace 21. FIG.6 (b) shows the state of the timing with which the target to-be-rolled material 100 [a] reached the finish mill rolling start position after finish mill rolling start position arrival time t _R [a]. At this time, the extraction interval time t _EX [a + 1] of the to-be-rolled material 100 [a + 1] processed after the to-be-rolled material 100 [a] is the target-rolled material 100 [a]. ], Less than the extraction interval time t _EX [a], the to-be-rolled material 100 [a + 1] is already extracted from the heating furnace 21. FIG.6 (c) shows the state of the timing at which the finish mill rolling of the target to-be-rolled material 100 [a] is complete after finishing mill rolling time t _F [a].

In order for the rolling required time t _rm [a] to be within a target FDT, the target to-be-rolled material 100 [a] needs to reach the finish mill rolling start position, without sticking according to a vehicle material. Therefore, the sum of the finish mill rolling start position arrival time t _R [a] and the finish mill rolling time t _F [a] of the target to-be-rolled material 100 [a] is equal to the extraction interval time t _EX [ a + 1]) and the finish mill rolling start position arrival time t _R [a + 1]. That is, the following formula (8) may hold.

t _R [a] + t _F [a] (cur) ≤ t _EX [a + 1] + t _R [a + 1]-delta M. (8)

In Equation (8), deltaM represents the time of the margin and is a fixed value set in advance in order to avoid the rolling materials becoming too close in the hot rolling line 20. In addition, t _F [a] (cur) is a present value of the finish mill rolling time t _F [a].

If the condition of Expression (8) is satisfied, the process proceeds to step S330 and energy consumption calculation is performed.

If the condition of Expression (8) is not satisfied, it is determined in step S328 of FIG. 3 whether or not the flow rate and speed pattern of the ISC 265 can be changed. If changeable, the speed change rate α _V is calculated in step S329. Whether or not the flow rate and speed pattern of the ISC 265 can be changed is determined based on the maximum flow rate of the ISC 265, the ability of the motor to drive the rolling stand 260, and the like.

On the other hand, if the flow rate and speed pattern of the ISC 265 are not changeable in step S328, the rolling time adjustment apparatus 17 judges that abnormality cannot change the finish mill rolling time t _F [a] more than this. In that case, the process proceeds to step S330 without correcting the speed pattern.

In the speed change rate calculation of said step S329, the speed change rate (alpha) _V is calculated with respect to the rolling speed in the finishing mill 26 so that Formula (8) may be satisfied. The new finish mill rolling time t _F [a] (new) is calculated as in the following formula (9);

t _F [a] (new) = t _EX [a + l] + t _R [a + 1] -t _R [a] -delta M... (9)

The rolling time adjusting device 17 compares the present value t _F [a] (cur) of the finish mill rolling time with the target speed of the finish mill rolling time, and adjusts the required rate of change of the speed α _V. It calculates using following formula (10).

α _V = C ₁ × (t _F [a] (cur) / t _F [a] (new))... (10)

In formula (10), C ₁ is an empirically determined integer and is a fixed value or a table value recorded in a database or the like.

After calculating the speed change rate (α _V ) of the finish milling speed in step S329, the speed pattern is corrected in step S325 using the speed change rate (α _V ), and the ISC 265 is again performed in step S323. Correction calculation of the flow rate of is performed. Thereby, the velocity pattern and the flow rate of the ISC 265 are modified to achieve the target FDT.

When the rolling time required in step S327 (t _rm [a]) is within the target rolling time (t _Tar [a]), or when the flow rate and speed pattern of the ISC 265 cannot be changed any more in step S328. , The process proceeds to step S330, and an energy consumption amount required for rolling the target rolled material 100 [a] is calculated.

In steps S330 to S333, the energy consumption adjusting device 18 calculates the energy consumption amount and calculates the speed change rate α _V necessary to minimize the energy consumption amount.

In the calculation of the energy consumption in step S330, the rolling power at the target point is calculated using the speed pattern calculated by the schedule correction device 15. Using the calculated rolling power, the energy consumption adjusting device 18 uses the calculated rolling power until the target rolled material 100 [a] is pulled out of the end, that is, over the entire length of the target rolled material 100 [a]. Calculate the energy consumption (h).

The energy consumption amount E _P necessary for rolling the target to-be-rolled material 100 [a] is represented by the following equation (11);

E _P = ΣEj = Σ {(1/3600) x ∫P _wj (t) dt... (11)

In formula (11), ∫dt represents time integration from t = 0 to s. Here, s (sec) is rolling time. In addition, (Sigma) represents all the sum rolled by the dense 23 or the finishing mill 26, and Ej (xh) is the energy consumption amount in j-th rolling. "J-th rolling" means rolling in any of the passes R [1] to R [NRP] of the dense 23 and the rolling stands 1 to NF of the finishing mill 26.

Rolling power P _Wi (kPa) in target point i of Formula (11) is calculated as follows;

P _Wi = (1000 × V _i × G _i ) / R _i + P _WLOSSi ... (12)

The rolling roll speed V _i (m / s), the roll torque G _i (kNm), the roll radius R _i (mm), and the loss power P _WLOSSi (㎾) of the formula (12) are calculated by the schedule correcting device 15. The value obtained or empirically obtained.

Rolling power (P _Wi) is, as shown in equation (12), changes in proportion to the rolling roll speed (V _i) and the roll torque (G _i). 7 shows the change of the rolling power P _Wi in the longitudinal direction of the rolled material. The thick line part A of FIG. 7 has shown the change of rolling power P _Wi , and is linearly interpolated between target points. Areas E ₀ to E ₄ represent energy consumption amounts between target points, respectively. The area indicated by hatching in FIG. 7 is the energy consumption amount. That is, the energy consumption is represented by the following formula (13);

∫P _Wj (t) dt = ∑ {(P _Wi + P _{W (i + 1)} ) × S _i / 2}. (13)

In Equation (13), ∫dt represents time integration from t = 0 to S, and Σ represents the sum from i = 0 to M. M is the final target point. In addition, S _i represents the rolling time between the target points, and this S _i is calculated by other means depending on the case of the speed change. For example, in the case of controlling the FDT using the ISC 265, the speed between the target points is changed to the equivalent speed based on the specified acceleration. As a result, the rolling time (S _i) is represented by the following formula (14);

S _i = 2L _i / (V _{i +1} + V _i ). (14)

In equation (14), L _i is the distance between each target point.

After calculation of the energy consumption amount in step S330, in step S331, the energy consumption adjustment device 18 determines whether the energy consumption amount can be reduced. When the rolling time adjusting device 17 determines that the abnormality cannot change the rolling time of the finish mill, or when it is determined that the reduction of the energy consumption can not be expected in the calculation of the energy consumption immediately before, the energy consumption adjusting device 18 The schedule correction apparatus 15 outputs the control reference value SV in step S334 without changing the speed change rate α _V , and ends the processing.

On the other hand, when the energy consumption can be reduced, it is determined in step S332 whether the flow rate and the speed pattern of the ISC 265 can be changed. If the flow rate or speed pattern of the ISC 265 can be changed, a new speed change rate α _V is calculated in step S333.

Whether or not the energy consumption can be reduced is determined as follows, for example.

In general, energy consumption decreases when the rolling speed is made small. This is because the deformation rate required for rolling becomes small, so that the rolling load becomes small. On the other hand, when lubricating oil is applied between the roll of the rolling stand and the rolled material (lubricated rolling), as the rolling speed increases, the film thickness of the lubricating oil becomes thicker, and the amount of heat generated by friction between the roll and the rolled material decreases, The energy consumption of the hot rolling line is reduced. Usually, it is known that the influence of the former is large.

Therefore, the speed change rate (α _V ) is determined in the direction of decreasing the rolling speed in the calculation of the first energy consumption, and the speed change rate (α _V ) and the previous and current energy consumption calculations are calculated in the calculations after the first time. Using the result, the influence coefficient is calculated as follows.

In the calculation of the energy consumption of the first time, and determines the formula _{(15), (α V (} old)) speed change rate to lower the rolling speed and direction as;

α _{V ( old )} = C ₂ . (15)

In Equation (15), C ₂ is an integer and is a fixed value or a table value of a database. C ₂ is less than 1.0.

In the calculation of the energy consumption after the second time, the rate of change of the rate (α _V ), the energy consumption E _{P ( oId )} calculated last time and the energy consumption E _{P ( new )} calculated this time are compared, and Calculating the coefficient of influence as shown in equations (16) and (17);

(∂E / ∂α _V ) _{( new )} = (E _{P ( new )} -E _{P ( old )} ) / (α _{V ( old )} -1). (16)

α _{V ( new )} = 1-C ₃ / (∂E / ∂α _V ) _{( new )} × | E _{P ( new )} -E _{P ( old )} | ... (17)

When the difference between the energy consumption of the last time and the present time is small, that is, when the following expression (18) is satisfied, or when the speed change rate (α _V ) is small, that is, when the following expression (19) is satisfied, It is determined that the reduction of the consumption amount is not possible. In that case, the energy consumption cannot be reduced in step S331 at the time of calculating the next energy consumption, and the control reference value SV is output in step S334.

_{| E P (new) - E} P (old) | <C 4 ... (18)

α _{V ( old )} −1 | <C ₅ ... (19)

Here, C ₃ , C ₄ , C ₅ are empirically obtained integers, fixed values or table values of a database.

Using the calculated speed change rate α _{V ( new )} , the speed pattern is corrected in step S325, and the flow rate of the ISC 265 is corrected in step S323. Thereby, the FDT is maintained at the target temperature over the entire length of the rolled material 100, and the flow rate of the speed pattern and the ISC 265 is minimized under the conditions within the target rolling time t _Tar . This is determined.

By the above, the process shown in the flowchart 32 is complete | finished.

Here, with reference to FIG. 8, the example of the convergence calculation in the case of changing the flow volume of the ISC 265 in step S323 of FIG. 3 is demonstrated. In the flowchart of Fig. 8, i represents the number of the target point, ns is the smallest number of necessity target point numbers to be calculated, and ne is the largest number. In addition, j represents a number of the finishing mill 26, the rolling stand (260) of a, a final rolling stand number N _F. In steps S600 to S613 shown in FIG. 8, the flow rate of the ISC 265 is changed so that the FDT becomes the target FDT for all of the target point numbers ns to ne.

In S601, data of the target point i necessary for calculating the FDT is read. The required data are at least the finish milling temperature (FET _i ^cal ), the dimensions of the material to be rolled, and the temperature distribution. If these data have already been calculated, the calculated values are used, and if not, the predicted values are used.

In steps S602 to S611, the flow rate of the ISC 265 is corrected so that the calculation temperature FDT _i ^{cal for} each target point is within the allowable value of the target FDT.

First, in step S602, the initial schedule calculation apparatus 14 calculates a temperature drop from the finish mill entry thermometer position where the finish mill entry thermometer 292 is arranged to the first rolling stand entrance of the finish mill 26.

Subsequently, in steps S603 to S607, from the first rolling stand 260 [1] of the finishing mill 26 to the final rolling stand 260 [N _F ], the rolling stand exit temperature SD _j T is rolled. Calculate stand inlet temperature (SE _j T). The rolling stand exit temperature SD _j T is calculated in consideration of the amount of temperature drop that the rolled material 100 loses due to contact with the rolling stand 260, and the amount of temperature rise due to processing heat generated by rolling and frictional heat. In step S606, the temperature drop calculation considering the flow rate of the ISC 265 provided between the rolling stands of the finishing mill 26, the heat loss by heat transfer with the atmosphere, and the radiant heat to the atmosphere is performed.

In step S608, the calculated temperature FDT _i ^cal of the FDT at the finish mill exit thermometer position is calculated.

In step S609, it is determined whether the calculated temperature FDT _i ^ca1 is within the allowable value of the target FDT. If the calculation temperature (FDT _i ^ca1 ) is within the allowable value of the target FDT, the flow proceeds to step S612. If the calculation at all the target points i is not finished, the target point number in step S613 is advanced one step, and the process is step S602. If the calculations at all the target points i are finished, the process ends.

On the other hand, if the calculated temperature FDT _i ^ca1 is not within the allowable value of the target FDT in step S609, the flow advances to step S610 to determine whether or not the flow rate of the ISC 265 can be changed. Whether or not the flow rate of the ISC 265 can be changed depends on whether the flow rate of the ISC 265 is within the limit, or information that cannot be changed in the operating conditions or operator intervention. When the flow rate of the ISC 265 is changeable, the flow rate of the ISC 265 is changed in the range which can be changed in step S611. Thereafter, the process returns to step S602.

As described above, the calculation temperature FDT _i ^ca1 at each target point can be obtained by calculating the temperature drop from the finish mill entry thermometer position to the finish mill exit thermometer position.

Next, the speed correction method in step S325 of FIG. 3 is demonstrated with reference to FIG. The speed correction method described below is a method of applying the speed change rate (α _V ) output from the rolling time adjusting device 17 or the energy consumption adjusting device 18, and checking the limit value of the rolling speed, and The threshold value of the amount of change in the flow rate of the ISC 265 is checked.

The speed pattern SP1 shown by the broken line in FIG. 9A is an example of the speed pattern before correction. The horizontal axis in Fig. 9A is a time axis, and shows respective timings. "FET _ON " means the time when the tip of the to-be-rolled material 100 passes through the finishing mill entry thermometer 292, "FDT _ON " means the time when the end of the rolled material 100 passes through the finishing-mill exit thermometer 293, "FDT _OFF " is time when the end of the to-be-rolled material 100 passes through the finishing mill exit thermometer 293. "Coiler _{0 N"} is a time when the leading end of the confined material (100) reaches a coiler 28.

First, a limit value check of a rolling speed is performed. In FIG. 9B, the speed pattern before and after applying the speed change rate α _{V is} shown. If the speed change rate (α _V) is given, by the speed pattern that is the accumulated prediction speed change rate (α _V), and modifying the speed pattern. The speed pattern SP2 shown by the solid line in FIG. 9 (b) is the speed pattern after applying the speed change rate α _V.

Next, the threshold value check of the amount of change in the flow rate of the ISC 265 is performed. Here, the speed pattern is changed under two conditions in which the flow rate of the ISC 265 is maximum and minimum using the speed pattern SP2 shown in FIG. 9 (b) after applying the speed change rate α _V. Investigate the need for The necessity of changing the speed pattern can be investigated by performing a temperature drop calculation for each segment, from the finish mill entry thermometer to the finish mill exit thermometer. The FDT _Tg shown by the solid line in FIG. 9 (c) is the target FDT, and the FDT _{MAX shown} by the broken line is the calculation result of the FDT under the condition that the flow rate of the ISC 265 was minimized, and the FDT _MIN is the ISC 265. This is the calculation result of the FDT under the condition of maximizing the flow rate. The horizontal axis of FIG. 9C is a position from the front end of each segment. When the FDT _Tg in each segment is between FDT _MAX and FDT _MIN, the target FDT can be achieved over the entire length of the rolled material 100 by changing the flow rate of the ISC 265.

Therefore, when there are segments in which the FDT is lower than the target temperature under the minimum flow rate of the ISC 265, the speed pattern is increased so that all segments achieve the target temperature.

On the other hand, when there are segments in which the FDT is higher than the target temperature under the maximum flow rate of lSC 265, the speed of the speed pattern is made small so that all the segments achieve the target temperature.

Finally, the speed pattern is corrected so that the set rolling speed is within a limit of the rolling speed. S _RMAX shown by the broken line in FIG.9 (d) is an upper limit of a rolling speed, and S _RMIN is a lower limit of a rolling speed. The speed pattern is corrected so that the rolling speed until the to-be-rolled material 100 reaches the winder 28 does not exceed the board speed limit determined from the idle limit of the winder 28. . After the winder 28 reaches, the speed pattern is corrected so as not to exceed the rolling speed limit determined from the rotational speed limit of the motor driving the rolling stand. In addition, when the limit value of the speed at which the end of the rolled material 100 exits the final rolling stand of the finishing mill 26 is determined, the speed pattern is corrected so as not to exceed the limit value.

After correcting the speed pattern by the above procedure, the speed of achieving the target finish milling exit temperature over the entire length of the rolled material 100 by performing correction calculation of the flow rate of the ISC 265 in step S323 of FIG. The pattern and flow rate are determined.

As described above, according to the control device 10 according to the first embodiment of the present invention, the ISC 265 is maintained such that the finish milling exit temperature is maintained at the target temperature over the entire length of the rolled material 100. The flow rate and the speed pattern of the rolled material 100 are determined, and the rolling required time t _rm is accurately calculated from the determined speed pattern. The flow rate and speed pattern of the ISC 265 are corrected so that the calculated rolling time is within the target rolling time t _Tar calculated based on the operation instruction regarding the production amount or the input information of the operator.

Further, the rolling power at a plurality of target points is calculated using the speed pattern, and the energy consumption required for rolling is accurately calculated by time integration of the calculated rolling power. In order to minimize energy consumption within the target rolling time t _Tar , the flow rate and velocity pattern of the ISC 265 is determined. Therefore, according to the control apparatus 10 shown in FIG. 1, target rolling time can be realized, and the energy consumption amount of the hot rolling line 20 can be suppressed.

(Second Embodiment)

10, the flowchart for demonstrating the method of determining the extraction interval time which concerns on 2nd Embodiment by the control apparatus 10 of the hot rolling line 20 shown in FIG.

First, in step S1010, similarly to the method described with reference to the flowchart 31 in FIG. 3, the rolling campaign whose total number of sheets of the rolled material 100 is P is executed. Subsequently, in step S1020-S1140, the following calculation is performed about the to-be-rolled material 100 [1]-100 [P-1] in a rolling campaign according to a rolling procedure.

In step S1030, the extraction interval time t _EX [a] of the calculated rolled material 100 [a] and the extraction interval time t _EX [a + l] of the rolled material 100 [a + 1] Is a first extraction interval time combination.

In step S1040, the energy consumption adjusting device 18 uses the extraction interval time t _EX [a] and t _EX [a + l] to transmit the rolled material 100 [a] and the rolled material 100 [a]. +1]), the energy consumption amount described with reference to the flow chart 32 of FIG. 3 is calculated, and the energy consumption amounts E _P [a] and E _P [a + 1] are calculated, respectively. In addition, in step S1050, the sum P _tot of the energy consumption amount E _P [a] and the energy consumption amount E _P [a + l] is calculated as follows;

P _tot = E _P [a] + E _P [a + l]. (20)

Subsequently, in step S1060, the extraction interval time t _EX [a] of the rolled material 100 [a] is reduced by the minute time? T, and the extraction interval of the rolled material 100 [a + 1] is reduced. Increases the time t _EX [a + 1] by the minute time DELTA t;

t _EX ^SU [a] = t _Ex [a] -Δt... (21)

t _EX ^SU [a + l] = t _Ex [a + 1] + Δt... (22)

Δt is, for example, about 1 to 5 (sec). The extraction interval times t _EX ^SU [a] and t _EX ^SU [a + l] shown in Expressions (21) and (22) are represented. The combination is a second extraction interval time combination.

In step S1070, with respect to the to-be-rolled material 100 [a] and the to-be-rolled material 100 [a + 1], using extraction interval time t _EX ^SU [a] and t _EX ^SU [a + l], The energy consumption amount described with reference to the flowchart 32 of FIG. 3 is calculated to calculate the energy consumption amounts E _P ^SU [a] and E _P ^SU [a + l], respectively. Further, in step S1080, the sum P _tot ^SU of the energy consumption amount E _P ^SU [a] and the energy consumption amount E _P ^SU [a + l] is calculated;

P _tot ^SU = E _P ^SU [a] + E _P ^SU [a + l]. (23)

Subsequently, in step S1090, the extraction interval time t _EX [a] of the rolled material 100 [a] is increased by a minute time Δt, and the extraction interval time of the rolled material 100 [a + 1] is increased. decrease (t _EX [a + l]) by a minute time [Delta] t;

t _EX ^AD [a] = t _EX [a] + Δt... (24)

t _EX ^AD [a + l] = t _Ex [a + 1] -Δt... (25)

A combination of the extraction interval times t _EX ^AD [a] and t _EX ^AD [a + 1] shown in equations (24) and (25) is a third extraction interval time combination.

In step S1100, about the to-be-rolled material 100 [a] and the to-be-rolled material 100 [a + 1] using extraction interval time t _EX ^AD [a] and t _EX ^AD [a + 1], The energy consumption amount described with reference to the flowchart 32 of FIG. 3 is calculated, and energy consumption amounts E _P ^AD [a] and E _P ^AD [a + 1] are respectively calculated. In addition, in step S1110, the sum P _tot ^AD of the energy consumption amount E _P ^AD [a] and the energy consumption amount E _P ^AD [a + 1] is calculated;

P _tot ^AD = E _P ^AD [a] + E _P ^AD [a + 1]. (26)

In step S1120, one of the first, second, and third extraction interval time combinations of the combination of the extraction interval times when the energy consumption is the smallest among the sum of energy consumptions (P _tot . P _tot ^SU , P _tot ^AD ) To employ. Using the extraction interval time combination employed, the flow rate and velocity pattern of the ISC 265 is determined.

By the combination of the extraction interval time, for example, the to-be-rolled material 100 [a + 1] to be processed later is subjected to the hot rolling line 20 to wait for the processing of the previous to-be-rolled material 100 [a]. It may stop. The stop time or the like causes a problem that the rolled material 100 [a + 1] cools down. However, according to the above-described method of determining the extraction interval time, a combination of optimal extraction interval times can be employed.

As described above, according to the method for determining the extraction interval time described with reference to FIG. 10, the extraction interval time in all of the scheduled rolled material 100 does not change. For this reason, it is possible to determine the extraction interval time for reducing the energy consumption of the total amount of the scheduled rolled material while securing the production amount. Other than that is substantially the same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

(Third embodiment)

The extraction interval time t _EX can be calculated using the following equation (27) in addition to the equation (1);

t _EX = t _Tgt / P + χ (dh) (dh [a] -dh _AV ) + χ (l) (l [a] -l _AV ) + χ (FDTa) (FDTa [a] -FDTa _AV ) + χ (Rp (GC)) (Rp (GC [a])-Rp (GC) _AV ). (27)

In equation (27), dh is the rolling reduction, l is the length of the rolled material, FDTa is the target FDT, and GC is the grade code. The value with the subscript AV attached to each item indicates that it is an average value of the scheduled rolled material point portion. The function Rp () calculates the number of rolling passes of the dense 23 according to the grade code GC.

Also. The function χ () is calculated as the change in rolling time t with respect to the change in each item x in equation (27);

χ (x) = dt / dx... (28)

That is, in the control apparatus 10 which concerns on 3rd Embodiment of this invention, the extraction interval calculation apparatus 12 is the average rolling reduction dh _AV of all the target to-be-rolled material 100 [a] which is going to process, The average rolled material length l _AV and the average finish mill exit temperature FDTa _AV are calculated. Then, the difference between the reduction amount dh [a] of the target rolled material 100 [a] and the average reduction amount dh _AV , the rolling material length l [a] and the average rolling material length l _AV The extraction interval time is calculated using the difference between and the difference between the target finish mill exit temperature FDTa [a] and the average finish mill exit temperature FDTa _AV .

According to the above method, the influence on the amount of rolling down of each rolled material, the length of the rolled material, the target FDT and the extraction interval time of the grade cord is considered. The sum total of the extraction interval time t _EX represented by Formula (27) of the target to-be-rolled material 100 [a] (a = 1 to P) is the target total rolling time t _Tgt , and is represented by the formula (2) Since (3) is satisfied, the extraction interval time t _EX that achieves the target total rolling time t _Tgt can be determined. Other than that is substantially the same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

(Fourth Embodiment)

The control apparatus 10 which concerns on 4th Embodiment of this invention shown in FIG. 11 does not have the extraction interval calculating apparatus 12 and the target rolling time calculating apparatus 13, The control shown in FIG. Different from device 10. About other structure, it is the same as that of 1st Embodiment shown in FIG. The target rolling time t _Tar is also considered to be calculated by external functions such as mill passing. The control apparatus 10 shown in FIG. 11 uses the target rolling time t _Tar calculated by the external device 30 having the mill passing function on the heating furnace 21 side to form the hot rolling line 20. To control.

In the rolling time adjustment apparatus 17, the rolling required time is compared by comparing the target rolling time t _Tar input from the external device 30 with the rolling time t _rm calculated by the rolling time predicting calculation device 16. The speed change rate (α _V ) of the rolling speed is calculated so that the time t _rm is within the target rolling time t _Tar . Based on this speed change rate (α _V ), the speed pattern or the like is corrected by the schedule correction device 15. And if energy consumption can be reduced, the speed change rate (alpha) _V is calculated by the energy consumption adjustment apparatus 18 so that the energy consumption of the hot rolling line 20 may be minimized.

According to the control apparatus 10 shown in FIG. 11, energy consumption can be minimized on condition that rolling required time t _rm is within the target rolling time t _Tar input from a mill passing function. Other than that is substantially the same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

As mentioned above, although this invention was described by the 1st-4th embodiment, the description and drawings which form a part of this indication should not be understood that it limits this invention. Various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art from this disclosure. That is, of course, this invention includes various embodiment etc. which are not described here. Therefore, the technical scope of the present invention is determined only by the invention specific matters regarding the scope of the relevant claims from the above description.

10 control device 11 operating conditions processing device
12: extraction interval calculation device 13: target rolling time calculation device
14: initial schedule calculation device 15: schedule modification device
16: rolling time prediction calculation device 17: rolling time adjustment device
18: energy consumption adjusting device 20: hot rolling line
21: heating furnace 23: dense
26: finishing mill 28: winder
30: external device 100: rolled material
260: rolling stand 265: ISC
291: dense exit thermometer 292: finishing mill entry thermometer
293: exit mill thermometer

Claims (4)

As a control apparatus of the hot rolling line provided with the heating furnace and the finishing mill which has a some spray stand arrange | positioned continuously and the cooling spray arrange | positioned between the said some rolling stand,
An extraction interval calculating device for calculating an extraction interval time for extracting the plurality of rolled materials from the heating furnace based on operation information including a rolling processing schedule for a plurality of rolled materials to be rolled;
A target rolling time calculating device for calculating a target rolling time of the target to-be-rolled material, which is one of the plurality of rolled materials, using the extraction interval time and the operation information;
An initial schedule calculation device for calculating a flow rate of the cooling spray and a speed pattern of a rolling speed at which the target rolled material conveys the hot rolling line based on the operation information;
If the flow rate of the cooling spray is corrected, and only the flow rate of the cooling spray is corrected, the finish milling side temperature cannot be the target value over the entire length of the target to-be-rolled material, and the rate of change in the speed pattern is determined. A schedule correction device for correcting the speed pattern, when inputted;
A rolling time prediction calculating device for calculating a rolling time required of the target rolled material by using the speed pattern;
A rolling time adjusting device for calculating the speed change rate such that the rolling time required is within the target rolling time, and outputting the calculated speed change rate to the schedule correction device;
The rolling power at a plurality of target points set in the hot rolling line is calculated using the speed pattern, and the speed change rate calculated to minimize energy consumption obtained by time integration of the rolling power is output to the schedule correcting apparatus. Equipped with an energy consumption adjusting device to
The flow rate of the said cooling spray and the said speed pattern are determined so that the said energy consumption amount may be minimum in the range which the said rolling time required is below the said target rolling time, The control apparatus of the hot rolling line characterized by the above-mentioned. The method of claim 1,
The extraction interval calculating device is configured to perform a first extraction interval time from when the first to-be-rolled material is extracted from the heating furnace until the second to-be-rolled material is extracted after the first to-be-rolled material, and the heating Calculating a second extraction interval time after the second to-be-rolled material is extracted from the furnace and after the second to-be-rolled material is extracted from the third to-be-rolled material;
The energy consumption adjustment device,
A first extraction interval time combination consisting of the first extraction interval time and the second extraction interval time,
A second extraction interval time combination in which the first extraction interval time is increased by a certain time, and the second extraction interval time is decreased by the predetermined time, and,
A third extraction interval time combination in which the first extraction interval time is reduced by the constant time and the second extraction interval time is increased by the predetermined time
For each of, the sum of the energy consumption of the first energy consumption consumed in the rolling treatment of the first rolled material and the second energy consumption consumed in the rolling treatment of the second rolled material is calculated,
And the flow rate and the speed pattern of the cooling spray are determined by using any one of the first to third extraction interval time combinations in which the sum of the energy consumptions is minimum. 3. The method according to claim 1 or 2,
The extraction interval calculating device is a difference between the reduction amount of the target rolled material and the average rolling amount of the plurality of rolled materials, the difference between the rolled material length of the target rolled material and the average rolled material length of the plurality of rolled materials, and And the extraction interval time is calculated using a difference between a target finish mill exit temperature of the target rolled material and an average target finish mill exit temperature of the plurality of rolled materials. The method of claim 1,
The rolling time calculated by the mill passing function is used as the said target rolling time, The control apparatus of the hot rolling line characterized by the above-mentioned.

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