JP2010090455A - Method, apparatus and program for controlling speed in continuous heat-treatment facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To optimize the correlation between a sheet temperature changing amount and a sheet passing-through speed by considering a neck-speed schedule, based on the restricting condition. <P>SOLUTION: An apparatus for controlling the speed in a continuous heat-treatment facility, is provided with: a neck-speed scheduled part 2, in which the neck-speed schedule is prepared while advancing a strip into only a predetermined distance from the present position, base on a theoretical limited speed; a simulating part 3, in which the plurality of speed schedules are prepared, base on a plurality of speed changing patterns, based on the neck-speed schedule, and an error-predicted value of the heating furnace 51 is forecasted by performing a simulation related to each speed schedule therein; and a center speed searching part 4, in which the plurality of speed-changing patterns are evaluated by using an evaluating function containing the error-predicting value of the heating furnace 51 as a factor and the speed-changing pattern is decided therein. As the speed-changing pattern when the neck-speed is shifted, a pattern which is made to once lower speed than the neck-speed before and after shifting is adopted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speed control method, apparatus, and program for controlling the strip passing speed in continuous heat treatment equipment such as continuous hot dipping equipment and continuous annealing equipment.

  For example, in a metal production plant such as the steel industry, in a continuous heat treatment facility such as a continuous hot dip plating facility or a continuous annealing facility for metal strips, a series of operations from the heating furnace entry side to the alloying furnace exit side or from the heating furnace entry side. When controlling the plate speed (referred to as the center speed) to the heat treatment furnace exit side, for example, the heating capacity of the heating furnace, the equipment capacity such as the conveyance speed range of the conveyance roll, the heat treatment temperature and time of the metal strip, etc. It is necessary to determine the neck speed schedule based on constraints such as manufacturing specifications. When there are a plurality of constraint conditions, the minimum speed of the theoretical constraint speed obtained from each constraint condition is extracted as the neck speed schedule so as to satisfy all the constraint conditions.

  If the neck speed schedule is determined, the speed is changed at an appropriate acceleration / deceleration rate based on that schedule. However, if the speed is changed at a fixed acceleration / deceleration rate, the plate temperature will be within the upper and lower limits. May result in instability of operation.

  At present, guidance level systems such as displaying the neck speed schedule on the screen have been constructed, but the final speed determination is actually based on the judgment of the operator.

  As a technique for controlling the plate passing speed in the continuous heat treatment equipment, for example, in Patent Document 1, steel that is passed through a continuous annealing furnace by automatically setting the acceleration / deceleration rate of the line speed based on the measured plate temperature. An automatic line speed acceleration / deceleration rate setting system is disclosed in which the line speed of a steel strip is changed at an appropriate acceleration / deceleration rate without causing the strip to go out of plate temperature.

  Further, Patent Document 2 discloses a central speed control of a continuous annealing line in which a step of calculating a constraining speed of a central speed based on restrictions due to furnace load combustion and a heat treatment method and a step of determining an acceleration / deceleration rate are performed. A method is disclosed.

  Further, in Patent Document 3, when the deviation between the estimated plate temperature change amount and the target plate temperature of the strip is out of the allowable range, the furnace temperature control of the heating furnace and the strip passing speed correction control are performed. A plate temperature control method in a continuous annealing furnace performed is disclosed.

  Moreover, in patent document 4 by this applicant, considering the neck speed schedule based on a constraint condition, about the speed schedule of the preset multiple pattern, by predicting the responsiveness of the exit side plate temperature of a heating furnace by simulation In addition, a speed control method in a continuous annealing furnace is disclosed that optimizes the correlation between the plate temperature variation and the central speed of the sheet passing while maintaining strictness.

JP 2003-226911 A JP-A-6-330182 JP-A-2-258933 JP 2007-63641 A

  However, the line speed acceleration / deceleration rate automatic setting system disclosed in Patent Document 1 has a problem that the neck speed schedule based on the constraint condition is not considered.

  In addition, in the central speed control method of the continuous annealing line disclosed in Patent Document 2, when determining the acceleration / deceleration rate, a limit speed (rate-control line) that does not fluctuate in the plate temperature of each heat treatment furnace, which is known from experiments, is used. Since it is based on experiments, there is a problem in terms of control accuracy of the plate temperature.

  Further, in the plate temperature control method disclosed in Patent Document 3, when the deviation between the estimated plate temperature change amount and the target plate temperature of the strip is outside the allowable range, the furnace temperature control of the heating furnace and the strip passage are performed. It is for correcting the plate speed and is not necessarily a technique for determining the optimum operating conditions.

  Moreover, although the speed control method in the continuous annealing furnace disclosed in Patent Document 4 enables a highly accurate plate temperature control, the thickness of the metal strip to be passed is changed in order to linearly change the speed change pattern. When the thickness is thin or the fluctuation amount is large, the plate temperature may not be controlled with sufficiently high accuracy.

  The present invention has been made in view of the above points, while considering the neck speed schedule based on the constraint conditions, the plate temperature does not deviate from the upper and lower limit ranges, and the plate temperature control is maintained with high accuracy while the plate temperature is maintained. The purpose is to be able to determine the best operating conditions as much as possible by simultaneously calculating the temperature change amount and the speed change pattern.

The speed control method for a continuous heat treatment facility according to the present invention is a speed control method for controlling the strip passing speed in the continuous heat treatment facility, and the strip is a predetermined distance based on the constraint conditions in the continuous heat treatment facility. A speed schedule is created based on a speed change pattern based on a neck speed schedule created based on the neck speed schedule created by the neck speed schedule creating procedure. Using the simulation procedure for predicting the plate temperature by a simulator simulating a predetermined heat treatment furnace included in the continuous heat treatment facility, and using the evaluation function including the result obtained by the simulation procedure as an element, the speed change pattern is Depending on the result of the evaluation It consists of a speed search procedure for determining the change pattern, the speed change pattern, when shifting the neck velocity, characterized by a pattern that once slower than neck speed before and after the transition.
The speed control device for a continuous heat treatment facility according to the present invention is a speed control device for controlling the strip passing speed in the continuous heat treatment facility, and the strip is a predetermined distance based on the constraint conditions in the continuous heat treatment facility. A neck speed schedule creating means for creating a neck speed schedule while only traveling, a speed schedule is created based on a speed change pattern based on the neck speed schedule created by the neck speed schedule creating means, and the speed schedule Using the simulation means for predicting the plate temperature by a simulator simulating a predetermined heat treatment furnace included in the continuous heat treatment equipment, and using the evaluation function including the result obtained by the simulation means as an element, the speed change pattern is Depending on the result of the evaluation And a speed search means for determining the change pattern, the speed change pattern, when shifting the neck velocity, characterized by a pattern that once slower than neck speed before and after the transition.
The program according to the present invention is a program for causing a computer to execute a process for controlling a plate passing speed in a continuous heat treatment facility, and the strip advances by a predetermined distance based on a constraint condition in the continuous heat treatment facility. A neck speed schedule creation process for creating a neck speed schedule during the process, a speed schedule is created based on the speed change pattern based on the neck speed schedule created by the neck speed schedule creation process, and the speed schedule The speed change pattern is evaluated using a simulation process for predicting the plate temperature by a simulator simulating a predetermined heat treatment furnace included in the continuous heat treatment facility, and an evaluation function including the result obtained by the simulation process as an element. , The result of the evaluation And a speed search process for determining a speed change pattern in response to the computer, and the speed change pattern is a pattern that temporarily lowers the neck speed before and after the transition when the neck speed is shifted. And

  According to the present invention, while considering the neck speed schedule based on the constraint conditions, by performing simulation with a simulator simulating a heat treatment furnace, the plate temperature change amount and the speed change pattern can be calculated simultaneously while maintaining strictness. As good operating conditions as possible can be determined. In particular, when shifting the neck speed as a speed change pattern, adopting a pattern that temporarily lowers the neck speed before and after the transition makes it possible to reduce the strip thickness or the strip thickness to a predetermined range. Even in the case of changing beyond this, it is possible to prevent the plate temperature from going out.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
(First embodiment)
FIG. 13A shows a configuration example of a continuous heat treatment facility including a heating furnace 51, a soaking furnace 52, a cooling furnace 53, and an overaging zone 54. Metal strips S (hereinafter also referred to as strips and coils) such as steel materials are sequentially welded at the front stage of the continuous heat treatment equipment, and are continuously passed through the heating furnace 51, the soaking furnace 52, the cooling furnace 53, and the overaging zone 54. Then, it is cut again by a cutter after the continuous heat treatment equipment.

  In FIG. 1, the structure of the speed control apparatus of the continuous heat processing equipment which concerns on embodiment to which this invention is applied is shown. The speed control apparatus according to the present embodiment controls the plate passing speed in the continuous heat treatment facility shown in FIG. The plate passing speed in the continuous heat treatment equipment, that is, the speed from the entrance side to the exit side of the continuous heat treatment equipment shown in FIG.

  Reference numeral 1 denotes an input unit for an operator to input an upper limit value of the central speed and a bias value for the neck speed schedule. The operator can input an arbitrary upper limit value [mpm] and an arbitrary bias value [mpm] within a predetermined range via an operator intervention operation panel (not shown).

  Reference numeral 2 denotes a neck speed schedule creation unit. The strip S has a predetermined distance x [m] from the present on the basis of constraints such as equipment capacity and metal strip manufacturing specifications in each of the heat treatment furnaces 51 to 54 of the continuous heat treatment equipment. Create a neck speed schedule while only progressing.

  3 is a simulation unit including a process simulator, which creates a plurality of speed schedules based on a plurality of speed change patterns prepared in advance based on the neck speed schedule created by the neck speed schedule creation unit 2. The plate temperature response is simulated for each speed schedule, and the outlet side plate temperature of the heating furnace 51 is predicted. At this time, if an upper limit value of the central speed or a bias value for the neck speed schedule is input via the input unit 1, it is considered.

  Reference numeral 4 denotes a central speed search unit, which evaluates a plurality of speed change patterns using an evaluation function including an exit side plate temperature of the heating furnace 51 as an element, and determines a speed change pattern from the evaluation speed change patterns.

  The speed control device controls the plate feed speed in the continuous heat treatment facility according to the speed schedule based on the speed change pattern determined by the central speed search unit 4.

  Further, the speed control device displays a visual image of the speed schedule based on the speed change pattern determined by the central speed search unit 4 on the display device 5. Further, if the neck speed schedule created by the neck speed schedule creation unit 2 or a plurality of speed schedules created by the process simulator 3 are visually displayed on the display device 5, for example, the operation guidance function for the operator can be improved. Is realized.

  FIG. 2 is a flowchart for explaining the processing operation of the speed control device according to the present embodiment. First, in step S <b> 101, the neck speed schedule creation unit 2 calculates a theoretical constraint speed (neck speed) in the heating furnace 51, the soaking furnace 52, the cooling furnace 53, and the like.

For example, the theoretically limited speed VC _HF based on the heating capacity in the equipment specifications in the heating furnace 51 is calculated by appropriately using the mathematical model f ₁ as shown in the following formula (101). It is also possible to use a known model as mathematical expression model f _1.
VC _HF = f ₁ (TPH, ρ, WD, TH, VR) (101)
However, TPH: T / H [ton / hour], ρ: specific gravity [ton / m ³ ], WD: plate width [m], TH: plate thickness [m], VR: speed achievement rate [−].

Further, the theoretically constrained speed VC _RSF based on the soaking time in the equipment specifications in the soaking furnace 52 is calculated appropriately using the mathematical model f ₂ as shown in the following formula (102). It is also possible to use a known model as mathematical expression model f _2.
VC _RSF = f ₂ (PL _RSF , Tref _RSF ) (102)
However, PL _RSF : soaking furnace path length [m], Tref _RSF : soaking time [sec].

Next, in step S102, the neck speed schedule creation unit 2 sets the theoretically limited speeds VC _HF , VC _RSF ,... In the heating furnace 51, the soaking furnace 52, the cooling furnace 53, etc. calculated in step S101. Based on this, a neck speed schedule VC _min is created while the strip S travels a predetermined distance x [m] from the present.

Specifically, as shown in FIG. 3, the heating furnace 51, Hitoshinetsuro 52, theoretical constraint velocity VC _HF in such cooling furnace 53, VC _RSF, to meet all of ..., theoretical constraint velocity VC _HF , VC _RSF ,... _Are extracted as a neck speed schedule VC _min (solid line in FIG. 3).

Next, in step S103, the simulation unit 3 creates a plurality of speed schedules V based on a plurality of speed change patterns prepared in advance based on the neck speed schedule VC _min created in step S102. For each of these speed schedules V, the outlet side plate temperature of the heating furnace 51 is predicted by a process simulator.

Specifically, first, when the upper limit value of the central speed and the bias value for the neck speed schedule are input, the neck speed schedule VC _min created in step S102 is lowered by the bias value, and the upper limit value is set. Cut the excess part.

Subsequently, a plurality of speed schedules V are created based on a plurality of speed change patterns prepared in advance. In this embodiment, as indicated by the dotted line in FIG. 4, as the speed change pattern, when the neck speed is shifted, a V-shaped pattern that temporarily lowers the neck speed before and after the transition is adopted. To describe in the example of FIG. 4, when shifting to the neck speed VC _min1 → VC _min2, once slower than their migration around the neck speed VC _min1, VC _min2. Similarly, when the shifting to the neck speed VC _min2 → VC _min3, once slower than their migration around the neck speed VC _min2, VC _min3.

  In the present embodiment, the V-shaped pattern is expressed by four parameters of a deceleration start position a, a deceleration rate ∠b, a return position c, and an acceleration rate ∠d, and a plurality of combinations of parameters a to d are prepared in advance. You just have to. The way of expressing the V-shaped pattern is not limited to this. For example, the V-shaped pattern can be expressed by three parameters of a deceleration start position a, a turn-back position c, and a neck speed arrival position e. FIG. 5 shows how the speed schedule V is created.

  Subsequently, a simulation is executed by the process simulator for the speed schedule V based on each of the plurality of speed change patterns, and the outlet side plate temperature of the heating furnace 51 is predicted. In this embodiment, as shown in FIG. 6 instead of the outlet side temperature of the heating furnace 51 predicted by the simulation unit 3, as shown in FIG. 6, an error prediction value for the target side temperature of the outlet side temperature of the heating furnace 51 for each speed schedule V. ΔTS (t) [° C.] is obtained. The target plate temperature of the outlet side plate temperature of the heating furnace 51 is determined by a process computer (not shown) according to a production schedule.

  FIG. 12 shows a schematic configuration of an example of a process simulator. In the process simulator shown in FIG. 12, a radiant tube temperature model 701, a furnace temperature model 702, a hearth roll temperature model 703, a plate temperature model 704, and a furnace wall temperature model 705 represented by the following equations 1 to 5 are constructed. Using these mathematical models, the heat treatment in the heating furnace 51 is simulated, and an error estimated value ΔTS (t) [° C.] of the outlet side plate temperature of the heating furnace 51 is obtained for each of a plurality of speed schedules V.

  In this embodiment, since the plate temperature change of the heating furnace 51 is important in operation, a simulator simulating the heating furnace 51 is constructed. However, a simulator simulating another heat treatment furnace is constructed. Alternatively, a simulator simulating a plurality of heat treatment furnaces may be constructed.

  Next, in step S104, the central speed search unit 4 evaluates a plurality of speed change patterns using the evaluation function J including the error prediction value ΔTS (t) obtained in step S103 as an element, Determine the speed change pattern from the inside.

Specifically, ΣΔTS (t) ² calculated in step S103, the production amount WTV (t) (mass flow = plate width WD * plate thickness TH * furnace speed V), and an appropriate weight Q [−] Therefore, the evaluation function J constituted by the following expression (103) is used. Then, a speed change pattern in which the evaluation value by the evaluation function J takes a minimum value is determined from among the plurality of speed change patterns. In the equation (103), the plate temperature accuracy and the production amount can be balanced by adjusting the weight Q.
J = ΣΔTS (t) ² + QΣ1 / WTV (t) (103)

  Then, according to the speed schedule V based on the speed change pattern determined by said step S104, control of the plate | board speed in a continuous heat processing installation is performed.

  Here, the operation and effect of adopting the V-shaped pattern as the speed change pattern will be described. Patent Document 4 discloses a configuration for creating a speed schedule by linearly shifting the neck speed as indicated by a dotted line in FIG.

As described above, in the continuous heat treatment facility, the strips S are sequentially welded and continuously passed, but the thickness of each strip S is not necessarily constant. That is, the strips S having different thicknesses may be sequentially welded and continuously passed. FIG. 13B shows a schematic configuration of the heating furnace 51 and shows a state in which strips S _{1 to} S ₃ having different thicknesses are sequentially welded and continuously passed.

  When the strip S is thin or the strip S changes beyond a predetermined range, if the neck speed is shifted linearly as shown in FIG. There is a risk of it. This will be described below. FIG. 8 shows the relationship between the plate thickness and the furnace temperature, and the relationship between the plate thickness and the neck speed. When the plate thickness is thinner than the plate thickness a (region α where the plate thickness <a), the neck speed is determined by the limit of the driving ability of the motor for threading. On the other hand, when the plate thickness is equal to or greater than the plate thickness a (region β where plate thickness ≧ a), the neck speed is determined by the heating capacity limit of the furnace. At point A in FIG. 8, it is possible to pass the plate at the limit of the driving capability of the motor, and since the plate thickness is thin, a desired plate temperature can be ensured even if fuel is not burned firmly. On the other hand, at point B, since the plate thickness is thick, fuel is poured firmly to raise the furnace temperature to the limit, and the speed is reduced to extend the staying time in the furnace to ensure the plate temperature.

  When the plate thickness of the strip S changes only in the region β, even if the neck speed is linearly shifted as shown in FIG. 7, the plate temperature does not go out. However, when the plate thickness of the strip S changes in the region α or changes across the region α and the region β (point A⇔B in FIG. 8), the neck speed is linear as shown in FIG. If it is shifted, the plate temperature may be lost.

  This is because, in the plate temperature control in the heating furnace 51, the speed and the furnace temperature (= fuel flow rate) are operating ends, but the responsiveness of these two operating ends is remarkably different. In other words, the speed is high in responsiveness and can be changed immediately (for example, several tens of seconds to several minutes), but the furnace temperature is low in responsiveness, and it takes time to increase (decrease) the furnace temperature (for example, Tens of minutes to raise 100 degrees). And in region β, the furnace temperature response is not a problem because it is in a steady state where the furnace temperature is maximum, but in region α, the furnace temperature response is a problem because the furnace temperature is in an unsteady state where the furnace temperature fluctuates. As shown in FIG. 7, when the neck speed is shifted linearly, the influence of the furnace temperature cannot catch up, and the plate temperature comes off.

  Therefore, by introducing a V-shaped pattern, even when the strip S is thin or the strip S changes beyond a predetermined range, it prevents the plate from coming off. is there.

  FIG. 9 is a characteristic diagram showing the state of the furnace temperature, speed, and plate temperature when the plate thickness of the strip S changes from point A to point B, that is, when the plate thickness increases (see FIG. 9A). It is. Since the plate thickness is increased, the furnace temperature is raised at timing 901 as shown in FIG.

  Also, as shown in FIG. 9C, by introducing a V-shaped pattern, the speed is lowered at timing 902 to secure the plate temperature, and the speed is adjusted in accordance with the increase in the furnace temperature at plate thickness change timing 903. The neck speed is reached at timing 904. In addition, the dotted line in FIG.9 (c) is a characteristic line in the case of shifting the neck speed linearly as it exists in patent document 4. In FIG.

  As a result, as shown in FIG. 9 (d), as compared with the case where the neck speed is shifted linearly (dotted line in FIG. 9 (d)), the plate temperature is prevented from lowering and the plate temperature is secured. Thus, it is possible to prevent the plate temperature from being removed.

  FIG. 10 shows the state of the furnace temperature, speed, and plate temperature when the plate thickness of the strip S changes from point B to point A, that is, when the plate thickness becomes thin (see FIG. 10A). FIG. Since the plate thickness is reduced, the furnace temperature is lowered at timing 1001 as shown in FIG.

  Further, as shown in FIG. 10C, a V-shaped pattern is introduced, and the speed is decreased at timing 1001 so that the plate temperature does not decrease too much. The speed is increased at the plate thickness change timing 1002, and the neck speed is reached at the timing 1003. In addition, the dotted line in FIG.10 (c) is a characteristic line in the case of shifting the neck speed linearly as it exists in patent document 4. In FIG.

  As a result, as shown in FIG. 10 (d), as compared with the case where the neck speed is shifted linearly (dotted line in FIG. 10 (d)), the plate temperature is prevented from lowering and the plate temperature is secured. Thus, it is possible to prevent the plate temperature from being removed.

  Note that the V-shaped pattern has a large thickness as shown in FIGS. 9 (c) and 10 (c) in order to secure the plate temperature by reducing the speed when the strip S is thick. It can be said that a shape in which the neck speed is gradually shifted in stages (to reach the next neck speed over time) is desirable (see timings 904 and 1001).

As described above, the plate temperature change amount and the speed change pattern are calculated simultaneously while maintaining the strictness by performing the simulation with the simulator simulating the heat treatment furnace while considering the neck speed schedule VC _min based on the constraint conditions. As a result, the best operating conditions can be determined. In particular, by adopting a V-shaped pattern as the speed change pattern, even if the strip S is thin or the strip S changes beyond a predetermined range, the plate temperature does not go out. can do.

(Second Embodiment)
In the first embodiment, a plurality of speed change patterns prepared in advance are evaluated, and a speed change pattern is determined from them. On the other hand, the second embodiment is an example in which the speed change pattern is changed and the simulation and the central speed search are repeated until the evaluation value by the evaluation function J satisfies a preset value. The basic configuration and operation of the speed control device are the same as those in the first embodiment, and the differences will be mainly described below.

  FIG. 11 is a flowchart for explaining the processing operation of the speed control device of the continuous heat treatment facility according to this embodiment. First, in step S201, as in the first embodiment, the neck speed schedule creation unit 2 calculates the theoretical constraint speed (neck speed) in the heating furnace 51, the soaking furnace 52, the cooling furnace 53, and the like.

Next, in step S202, as in the first embodiment, the neck speed schedule creation unit 2 calculates the theoretically limited speed VC _HF in the heating furnace 51, the soaking furnace 52, the cooling furnace 53, and the like calculated in step S201. , VC _RSF ,..., Create a neck speed schedule VC _min while the strip S _travels a predetermined distance x [m] from the present.

Next, in step S203, an initial value of the speed change pattern is given. Next, in step S204, the simulation unit 3 creates a speed schedule V based on the currently given speed change pattern based on the neck speed schedule VC _min created in step S202, and the speed schedule. For V, the outlet side plate temperature of the heating furnace 51 (error predicted value ΔTS (t) [° C.] of the outlet side plate temperature of the heating furnace 51 with respect to the target plate temperature) is predicted.

  Next, in step S205, the central speed search unit 4 evaluates the currently given speed change pattern using the evaluation function J including the error prediction value ΔTS (t) obtained in step S204 as an element. To do. Then, it is determined whether or not the evaluation value is within a preset value (allowable error ε).

  If the evaluation value is within the allowable error ε, the current speed change pattern is determined as the optimum speed change pattern in step S206. On the other hand, if the evaluation value is not within the allowable error ε, the speed change pattern is corrected in step S207, and the process returns to step S204. When the speed change pattern is corrected in step S207, it is learned from the past results in which direction the evaluation value based on the evaluation function J approaches the allowable error ε, and the correction is made in that direction. You may give a function.

  In the second embodiment described above, since the calculation process is performed recursively, the calculation time may be longer than that in the first embodiment, but the speed change pattern that is highly evaluated by the evaluation function J is high. Can be assured.

  In the above embodiment, the V-shaped pattern has been described. However, when the neck speed is shifted, the V-shaped pattern is not limited to the V-shaped pattern as long as it is once lower than the neck speed before and after the transition. For example, when shifting the neck speed, it may be a trapezoidal pattern that temporarily lowers the neck speed before and after the transition and maintains the state for a predetermined time, or a U-shaped pattern that smoothly performs deceleration and acceleration. Also good.

  Note that the speed control apparatus to which the present invention is applied can be specifically configured by a computer system or apparatus. Accordingly, a storage medium storing software program codes for realizing the functions described above is supplied to the system or apparatus, and a computer (or CPU or MPU) of the system or apparatus reads and executes the program codes stored in the storage medium. Needless to say, this can be achieved.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention. As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

It is a figure which shows the structure of the speed control apparatus of the continuous heat processing equipment which concerns on 1st Embodiment. It is a flowchart for demonstrating the processing operation of the speed control apparatus which concerns on 1st Embodiment. It is a figure which shows a mode that a neck speed schedule is produced. It is a figure which shows a V-shaped pattern. It is a figure which shows a mode that a speed schedule is produced based on a speed change pattern based on a neck speed schedule. It is a characteristic view which shows the relationship between time and plate temperature. It is a figure which shows the conventional speed change pattern. It is a characteristic view which shows the relationship between plate | board thickness and furnace temperature, and the relationship between plate | board thickness and neck speed. It is a characteristic view which shows the state of furnace temperature, speed | velocity | rate, and plate temperature when plate | board thickness becomes thick. It is a characteristic view which shows the state of a furnace temperature, speed | velocity | rate, and plate temperature when plate | board thickness becomes thin. It is a flowchart for demonstrating the processing operation of the speed control apparatus which concerns on 2nd Embodiment. It is a figure which shows the outline | summary of a process simulator. It is a figure which shows the structural example of a continuous heat processing equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input part 2 Neck speed schedule preparation part 3 Simulation part 4 Central speed search part 5 Display apparatus 51 Heating furnace 52 Soaking furnace 53 Cooling path 54 Overaging zone S Strip

Claims (5)

A speed control method for controlling the strip passing speed in a continuous heat treatment facility,
Neck speed schedule creation procedure for creating a neck speed schedule while the strip travels a predetermined distance based on the constraints in the continuous heat treatment facility;
A speed schedule is created based on a speed change pattern based on the neck speed schedule created by the neck speed schedule creation procedure, and the speed schedule is created by a simulator simulating a predetermined heat treatment furnace included in the continuous heat treatment facility. A simulation procedure to predict the temperature;
Using an evaluation function including the result obtained by the simulation procedure as an element, the speed change pattern is evaluated, and a speed search procedure for determining the speed change pattern according to the result of the evaluation includes:
A speed control method for a continuous heat treatment facility, wherein the speed change pattern is a pattern in which when the neck speed is shifted, the speed is once lower than the neck speed before and after the transition. In the simulation procedure, a plurality of speed schedules are created based on a plurality of speed change patterns based on the neck speed schedule created in the neck speed schedule creation procedure, and the plate temperature is predicted by the simulator for each of the speed schedules. And
The speed search procedure uses the evaluation function including the result obtained by the simulation procedure as an element, evaluates the plurality of speed change patterns, and determines a speed change pattern therefrom. Item 2. A method for controlling the speed of the continuous heat treatment facility according to Item 1. In the simulation procedure, a speed schedule is created based on one speed change pattern based on the neck speed schedule created by the neck speed schedule creation procedure, and the plate temperature is predicted by the simulator for the speed schedule,
In the speed search procedure, an evaluation value is calculated using an evaluation function including the result obtained by the simulation procedure as an element,
The speed of the continuous heat treatment equipment according to claim 1, wherein the speed change pattern is changed and the simulation procedure and the speed search procedure are repeated until the evaluation value satisfies a preset value. Control method. A speed control device for controlling the strip feeding speed in a continuous heat treatment facility,
Neck speed schedule creating means for creating a neck speed schedule while the strip travels a predetermined distance based on the constraints in the continuous heat treatment facility;
A speed schedule is created based on a speed change pattern based on the neck speed schedule created by the neck speed schedule creating means, and the speed schedule is determined by a simulator that simulates a predetermined heat treatment furnace included in the continuous heat treatment facility. Simulation means for predicting temperature;
Using an evaluation function including the result obtained by the simulation means as an element, the speed change pattern is evaluated, and a speed search means for determining a speed change pattern according to the result of the evaluation, and
A speed control apparatus for a continuous heat treatment facility, wherein the speed change pattern is a pattern in which when the neck speed is shifted, the speed is once lower than the neck speed before and after the transition. A program for causing a computer to execute a process for controlling a strip passing speed in a continuous heat treatment facility,
A neck speed schedule creation process for creating a neck speed schedule while the strip travels a predetermined distance based on the constraints in the continuous heat treatment facility;
A speed schedule is created based on a speed change pattern based on the neck speed schedule created by the neck speed schedule creation process, and a board that simulates a predetermined heat treatment furnace included in the continuous heat treatment facility for the speed schedule. Simulation process to predict the temperature,
Using the evaluation function including the result obtained by the simulation process as an element, the speed change pattern is evaluated, and a speed search process for determining the speed change pattern according to the result of the evaluation is executed by a computer,
The program according to claim 1, wherein the speed change pattern is a pattern that temporarily lowers the neck speed before and after the transition when the neck speed is shifted.

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