JP2011218428A - Apparatus for controlling finishing continuous rolling mill, method of controlling the mill, and method of creating control pattern of the mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for controlling a finishing rolling mill, which prevents strip running from having troubles caused by the decreased rolling speed and controls the temperature of a material to be rolled to accord to the decreased rolling speed, to provide a method of controlling the mill, and to provide a method of creating a control pattern of the mill.SOLUTION: The apparatus includes: a speed monitor 11 which monitors a real-time rolling seed of a material 100 to be rolled; a calculation device 12 which calculates the timing to start decreasing the rolling speed to be the same speed as that of the end of the material 100 passing through a rolling stand which is a finishing point of speed deceleration for every time the material 100 is conveyed at a constant length in the finishing continuous rolling mill 20; a speed controller 13 which controls adjustment of the rolling speed by the mill 20 to start decreasing the rolling speed at the timing of starting the speed deceleration; and a temperature controller 14 which control a temperature adjustment of the material 100 by the mill 20 to compensate a change in the temperature of the material 100 caused by the speed deceleration.

Description

  The present invention relates to a control device, a control method, and a control pattern creation method for a finishing continuous rolling mill having a plurality of rolling stands.

  A finishing continuous rolling mill in which a plurality of rolling stands are continuously arranged is used in a hot rolling line or the like. In the finish continuous rolling mill, it is necessary to ensure the stability of the passing of the tail end of the material to be rolled in order to avoid the trouble of passing the material such as meandering, perforation and cutting of the material to be rolled. For this reason, the speed at which the material to be rolled moves in the finishing continuous rolling mill (hereinafter referred to as “rolling speed”) is controlled. Specifically, the rolling speed when the material to be rolled passes through the rolling stand at the final stage of the finish continuous rolling mill (hereinafter referred to as “tail end slipping speed”) and the rolling speed is reduced to the tail end slipping speed. It is desirable that the tail end position (hereinafter referred to as “deceleration completion position”) of the material to be rolled at this time is fixed at a set value. The behavior of the rolling speed of the material to be rolled given by the tail end slipping speed and the deceleration completion position is hereinafter referred to as “tail end deceleration pattern”.

  It is desirable to delay the rolling speed reduction start timing as much as possible from the viewpoint of product productivity. This is because the slower the deceleration start timing, the longer the rolling distance of the material to be rolled at a higher rolling speed, and the shorter the time required to roll the material to be rolled from the tip to the tail. Further, since the temperature of the material to be rolled decreases due to the reduction of the rolling speed, it is desirable to delay the reduction start timing of the rolling speed as much as possible in order to lengthen the section in which the material temperature is kept constant.

  On the other hand, the rolling speed deceleration start timing is delayed, so that when the tail end of the material to be rolled passes through the finish continuous rolling mill, the rolling speed may not be able to be reduced to the desired tail end slipping speed. In this case, a trouble of passing the plate occurs in terms of an aperture or the like. Further, when the material to be rolled is rapidly decelerated, temperature control using a cooling spray or the like cannot compensate for the temperature drop of the material to be rolled, resulting in a quality problem such as insufficient temperature accuracy.

  Therefore, the tail end deceleration pattern is calculated for the purpose of preventing troubles in plate passing and quality control, and the deceleration start timing is determined.

  In general, when the material to be rolled reaches a predetermined position on the entry side of the finish continuous rolling mill, for example, when passing through the entry side thermometer, a tail end deceleration pattern is calculated, and the deceleration start timing of the rolling speed is determined. Then, the rolling speed is controlled based on the speed command pattern in which the deceleration start timing is designated.

  However, when the tail end deceleration pattern is calculated on the entry side of the finish continuous rolling mill, the rolling speed setting speed is calculated when the tail end deceleration pattern is calculated, such as by changing the rolling speed by dynamic control afterwards. There may be a difference between the actual value of the rolling speed and the rolling speed. Due to this difference in rolling speed, an error occurs in the timing of completion of deceleration with the tail end of the material to be rolled as the center. For this reason, when the situation is bad, there has often been a trouble of passing the plate at the tail end of the material to be rolled.

  For this reason, the strip remaining length in the finish rolling mill is obtained in real time based on the tail end missing signal informing that the tail end of the material to be rolled has passed through each rolling stand, and based on the strip remaining length and the actual speed value. A method for correcting the reduction rate of the rolling speed has been proposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 4-13407

  However, in the proposed method, a reduction stand for completing the reduction of the rolling speed is determined in advance, and the reduction rate must be changed under the conditions. Therefore, if the reduction rate of the rolling speed exceeds the limit of the equipment, the occurrence of plate passing trouble cannot be suppressed. Further, a high calculation accuracy is required for the tail end missing signal used for obtaining the strip remaining length.

  In general, the calculation of the tail end deceleration pattern is performed independently of the temperature control. Therefore, it is not always possible to compensate for the temperature drop of the material to be rolled, which occurs due to the reduction in rolling speed, by temperature control. That is, from the viewpoint of temperature control, changes in the deceleration start timing and the deceleration rate are disturbances.

  In view of the above problems, the present invention is a control device for a finish continuous rolling mill capable of suppressing the occurrence of a sheet passing trouble due to the reduction in rolling speed and controlling the temperature of the material to be rolled in accordance with the reduction in rolling speed, It is an object to provide a control method and a control pattern creation method.

  According to one aspect of the present invention, there is provided a control device for a finishing continuous rolling mill in which a plurality of rolling stands are continuously arranged, and (b) a rolling speed at which the material to be rolled moves in the finishing continuous rolling mill in real time. Speed monitoring device to monitor, and (b) completion of deceleration selected from a plurality of rolling stands using a rolling speed and a predetermined reduction rate each time the material to be rolled is conveyed within the finishing continuous rolling mill for a certain length A calculation device for calculating a deceleration start timing for starting reduction of the rolling speed so that the rolling speed becomes a preset tail end passing speed when the material to be rolled passes through the rolling stand, and (c) a deceleration start timing. A speed control device that controls the adjustment of the rolling speed by the finish continuous rolling mill so as to start the reduction of the rolling speed at a reduction rate in (2), and (d) compensates for temperature changes of the material to be rolled due to the reduction of the rolling speed As such, the controller of the finishing continuous rolling mill and a temperature control device for controlling the temperature adjustment of the material to be rolled by the finishing continuous rolling mill is provided.

  According to another aspect of the present invention, there is provided a method for controlling a finishing continuous rolling mill in which a plurality of rolling stands are continuously arranged, wherein (a) the rolling speed at which the material to be rolled moves in the finishing continuous rolling mill is determined in real time. And (b) reduction completed rolling selected from a plurality of rolling stands using a rolling speed and a predetermined reduction rate each time the material to be rolled is conveyed within the finish continuous rolling mill for a certain length. A step of calculating a deceleration start timing for starting reduction of the rolling speed so that the rolling speed becomes a preset tail end passing speed when the material to be rolled passes through the stand; and (c) deceleration at the deceleration start timing. To control the adjustment of the rolling speed by the finish continuous rolling mill so as to start the reduction of the rolling speed at a rate, and (d) to compensate for the temperature change of the material to be rolled due to the reduction of the rolling speed. The method of finishing the continuous rolling mill and controlling the temperature adjustment of the material to be rolled by the finishing continuous rolling mill is provided.

  According to still another aspect of the present invention, there is provided a method of creating a control pattern for controlling a finishing continuous rolling mill in which a plurality of rolling stands are continuously arranged, wherein (a) the material to be rolled is inside the finishing continuous rolling mill. A step of monitoring the moving rolling speed in real time; and (b) each time the material to be rolled is conveyed for a certain length in the finish continuous rolling mill, using a rolling speed and a predetermined reduction rate, Calculating a deceleration start timing for starting reduction of the rolling speed so that the rolling speed becomes a preset tail end slipping speed when the material to be rolled passes through the selected deceleration completion rolling stand; ) A step of creating a speed command pattern that includes a deceleration start timing and that defines a rolling speed from when the material to be rolled is loaded into the finish continuous rolling mill to when it is unloaded, and (d) the speed command pattern And a step of creating a temperature command pattern that regulates the temperature adjustment of the material to be rolled to be executed by the finishing continuous rolling mill so as to compensate for a temperature change of the material to be rolled due to a reduction in rolling speed. A machine control pattern creation method is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the control apparatus, control method, and control of a finishing continuous rolling mill which can control the temperature of a to-be-rolled material according to the reduction | decrease of rolling speed | rate which can suppress generation | occurrence | production of the sheet-passing trouble resulting from the reduction | decrease of rolling speed A pattern creation method can be provided.

It is a schematic diagram which shows the structure of the control apparatus which concerns on embodiment of this invention. It is a conceptual diagram of the equivalent distance which concerns on embodiment of this invention. It is a flowchart for demonstrating the method of calculating the deceleration start timing with the control apparatus which concerns on embodiment of this invention. It is a schematic diagram which shows the example of the speed command pattern produced by the control apparatus which concerns on embodiment of this invention. It is a schematic diagram which shows the example of the temperature command pattern produced by the control apparatus which concerns on embodiment of this invention. It is a flowchart for demonstrating the method of controlling a finishing continuous rolling mill with the control apparatus which concerns on embodiment of this invention.

  Next, an embodiment 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 following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the embodiments of the present invention specify the structure, arrangement, etc. of the components as follows. It is not what you do. The embodiment of the present invention can be variously modified within the scope of the claims.

Control device 10 according to the embodiment of the present invention is an apparatus for controlling a plurality of rolling stands F ₁ to F _z continuous rolling mill 20 arranged finish which continuously as shown in FIG. 1 (z: 2 or more Integer). The control device 10 includes a speed monitoring device 11 that monitors the rolling speed at which the material 100 to be rolled moves in the finish continuous rolling mill 20 in real time, and the material to be rolled 100 is conveyed through the finish continuous rolling mill 20 by a certain length. Each time the material to be rolled 100 passes through the reduction completion rolling stand selected from the rolling stands F _{1 to} F _z using the rolling speed and a predetermined reduction rate, the rolling speed is preset at the trailing edge. Rolling by the finish continuous rolling mill 20 so as to start the deceleration of the rolling speed at a predetermined deceleration rate at the deceleration start timing, and the calculation device 12 that calculates the deceleration start timing for starting the deceleration of the rolling speed so as to become the speed The speed control device 13 for controlling the speed adjustment and the material 10 to be rolled by the finish continuous rolling mill 20 so as to compensate for the temperature change of the material 100 to be rolled due to the reduction of the rolling speed. And a temperature controller 14 for controlling the temperature regulation.

  As described above, the deceleration start timing is newly calculated every time the material to be rolled 100 is conveyed for a certain length in the finish continuous rolling mill 20. In the embodiment shown in FIG. 1, movement amount detection sensors 31 and 32 are arranged on the entry side and the exit side of the finish continuous rolling mill 20. The movement amount detection sensor 31 monitors the material to be rolled 100 on the entry side of the finish continuous rolling mill 20 and detects the amount of movement of the material to be rolled 100. Thereby, the length of the to-be-rolled material 100 carried in into the finishing continuous rolling mill 20 is detectable. The movement amount detection sensor 32 monitors the material to be rolled 100 on the exit side of the finish continuous rolling mill 20 and detects the amount of movement of the material to be rolled 100. Thereby, the length of the to-be-rolled material 100 carried out from the finishing continuous rolling mill 20 can be detected.

  The movement amount Ld of the material to be rolled 100 detected by the movement amount detection sensors 31 and 32 is notified to the control device 10. For this reason, the control apparatus 10 can detect the position of the to-be-rolled material 100 currently moving in the finishing continuous rolling mill 20. Each time the notified movement amount Ld reaches a certain distance, the control device 10 calculates a deceleration start timing. Thereby, the deceleration start timing is calculated every time the material to be rolled 100 is conveyed through the finish continuous rolling mill 20 for a certain length. For example, every time the material to be rolled 100 moves 2 m, the deceleration start timing is calculated.

  For example, the movement amount Ld of the material to be rolled 100 is notified from the movement amount detection sensor 31 to the control device 10 when the rolling process of the material to be rolled 100 is started. After the movement amount detection sensor 32 detects the movement amount Ld of the material to be rolled 100, the movement amount detection sensor 32 notifies the control device 10 of the movement amount Ld of the material to be rolled 100.

  The reduction rate of the rolling speed is set so that the temperature reduction of the material 100 to be rolled by the finish continuous rolling mill 20 can be compensated, and the rolling speed can be reduced to the tail end through speed as quickly as possible. Further, the tail end slipping speed is set so that no troubles in sheet passing occur after passing through the finish continuous rolling mill 20.

First, the finish continuous rolling mill 20 shown in FIG. 1 will be described. The finishing continuous rolling mill 20 is, for example, a rolling mill used in a hot rolling line. In the example shown in FIG. 1, the number of stages of the rolling stand of the finishing continuous rolling mill 20 is z stages. In FIG. 1, the first rolling stand of the finish continuous rolling mill 20 is indicated as F ₁ , and the final rolling stand is indicated as F _z . The material 100 to be rolled is gradually rolled as it moves in the finish continuous rolling mill 20 from the rolling stand F ₁ to the rolling stand F _z .

Finishing the continuous rolling mill 20 comprises a roll stand F ₁ to F _z arranged drive every M ₁ ~M _z. The driving devices M _{1 to} M _z include a motor that drives the rolling stands F _{1 to} F _z , respectively, and a speed detection device that detects the rolling speed from the operation of the motors. The rolling speed of the material 100 to be rolled when passing through the rolling stands F _{1 to} F _z is set by the motors of the driving devices M _{1 to} M _z . The speed detectors of the driving devices M _{1 to} M _z detect the rolling speed by monitoring the rotational speed of a motor that controls the roll rotational speed of the rolling stands F _{1 to} F _z , for example.

Moreover, the finish continuous rolling mill 20 has a temperature adjusting device 21 that adjusts the temperature of the material 100 to be rolled. The temperature control device 21 adjusts the spray flow rate of the cooling sprays C _{1 to} C _z that cools the material to be rolled 100 moving in the finish continuous rolling mill 20, for example. Specifically, when the temperature of the material 100 to be rolled decreases due to the reduction of the rolling speed, the temperature adjusting device 21 reduces the temperature of the material 100 to be rolled by reducing the spray flow rate of the cooling sprays C _{1 to} C _z. Suppress.

  A finish entry thermometer (FET) 41 measures the temperature of the material 100 to be rolled immediately before being carried into the finish continuous rolling mill 20. Further, the finish delivery thermometer (FDT) 42 measures the temperature of the material 100 to be rolled immediately after being taken out from the finish continuous rolling mill 20.

  In addition, FIG. 1 has shown the state which the front-end | tip of the to-be-rolled material 100 has passed through the finishing entry side thermometer 41. FIG. In the following, the timing at which the tip of the material to be rolled 100 passes through the finish entry side thermometer 41 is referred to as “entry side designation timing”.

Next, a method for calculating the deceleration start timing by the control device 10 will be described. The control device 10 calculates the deceleration start timing by calculating tail end deceleration pattern information I described below. The tail end deceleration pattern information I includes a reference rolling stand F _STD and a time difference dt from the reference rolling stand F _STD . Here, the "reference rolling stand", after the rolled material 100 has passed its reference roll stand F _STD, before entering the next stage of the rolling stand of the reference rolling stand F _STD, it begins deceleration of the rolling speed It is a rolling stand. The “time difference” is a time until the material to be rolled 100 starts to decelerate the rolling speed after passing through the reference rolling stand F _STD .

In the following description, the exit side of the _nth rolling stand Fn is defined as a deceleration completion position. That is, the rolling stand F _n as the deceleration complete rolling stand, the rolling stand F _n as rolling speed V _n when the tail end of the rolled material 100 is traversed becomes the the preset tail exit velocity V _OUT A case where the tail end deceleration pattern information I is calculated will be described.

In general, the reduction completed rolling stand whose rolling speed on the delivery side is the tail end pulling speed V _OUT is generally set as the final rolling stand. However, there are cases where the rolling speed at the rolling stand outlet side of the final stage cannot be reduced to the tail end slipping speed _{VOUT due} to an error in controlling the rolling speed. For this reason, the occurrence of trouble can be suppressed by setting the reduction completion rolling stand before the last stage, for example, the rolling stand before the last stage. In the control device 10 according to the embodiment of the present invention, the deceleration completed rolling stand can be arbitrarily selected from the rolling stands F _{1 to} F _z .

The relationship between the rolling speeds of any m-th stage rolling stand F _m and rolling stand F _n included in the rolling stands F _{1 to} F _z is related by the mass flow law as shown in the following equation (1):

V _m = [{h _n × (1 + f _n )} / {h _m × (1 + f _m )}] × V _n (1)

In Expression (1), V _m and V _n are rolling speeds on the exit side of the rolling stand F _m and the rolling stand F _n , respectively. Also, h _m and h _n is the thickness of the material to be rolled 100 at the delivery side of each rolling stand F _m and rolling stand F _n. f _m and f _n are advance rates of the rolling stand F _m and the rolling stand F _n , respectively.

The rolling speed (hereinafter referred to as “running speed”) V _{RUN, n} of the material to be rolled 100 at the time of calculating the tail end deceleration pattern information I is the speed detected by the driving device M _n of the rolling stand F _n. The actual value is V _{ACT, n} . The actual speed value _{VACT, n} is obtained by the speed monitor device 11 monitoring the drive device _Mn in real time. The actual speed value V _{ACT, n} monitored by the speed monitor device 11 is notified from the speed monitor device 11 to the calculation device 12.

The deceleration time Δt required to decelerate the rolling speed from the running speed V _{RUN, n} to the tail end slipping speed V _OUT is expressed by the following equation (2):

Δt = (V _{RUN, n} −V _OUT ) / β _n (2)

β _n is a predetermined reduction rate preset for the rolling stand F _n . Note that the reduction rate is set in advance for each of the rolling stands F _{1 to} F _z according to the advanced rate, depending on which rolling stand is the reduction completion rolling stand.

The length (hereinafter referred to as “rolled material length”) L _n of the passing portion of the material 100 to be rolled that passes immediately below the rolling stand F _n while the rolling speed is reduced is calculated by the following equation (3). :

L _n = V _{RUN, n} × Δt−β _n / 2 × Δt ² (3)

Further, a rolling stand F _n, between the rolling stand F _n-1 of the preceding rolling stand F _n, the distance relative to the exit side of the rolling stand F _n (hereinafter referred to as "equivalent distance".) L _{ESn -1, n} is defined by equation (4):

L _{ESn-1, n} = (h _n-1 / h _n ) × L _{PS, n + 1} (4)

L _{PS, n + 1} of the formula (4) is a physical rolling stands distance between rolling stands F _n-1 of the preceding rolling stand F _n and the rolling stand F _n. The equivalent distance L _{ESn-1, n} defined by the equation (4) is a distance between rolling stands in consideration of a change in the length of the material 100 to be rolled due to the rolling reduction at the rolling stands F _{1 to} F _n .

Similar to the equivalent distance L _{ESn-1, n} between the rolling stand F _n and the rolling stand F _n−1 , each equivalent distance between the rolling stands is a physical rolling stand based on the exit side of the rolling stand F _n. It is defined by using the distance and the outlet side plate thickness. For example, the equivalent distance L _ES1,2 between the rolling stand F ₁ and the rolling stand F ₂ is the thicknesses h ₁ and h _{n of the} material 100 to be rolled on the exit side of the rolling stand F _{1 and} the exit side of the rolling stand F _n , respectively. (H ₁ / h _n ) × L _PS1,2 is defined by using a physical distance L _PS1,2 between the rolling stands F ₁ and F ₂ . In FIG. 2, the conceptual diagram of the equivalent distance between each rolling stand is shown.

The calculation device 12 calculates the deceleration start timing as follows while comparing the length of the rolled material and the equivalent distance. Here, the case where the deceleration start timing is calculated when the tip of the material to be rolled 100 is positioned on the entry side of the _k-th rolling stand Fk will be described with reference to FIG. Based on the movement amount Ld of the material 100 to be rolled notified from the movement amount detection sensors 31, 32, the control device 10 can specify the position of the material 100 being moved in the finish continuous rolling mill 20.

Step For _{L n <L ESn-1,} n in S110, in step S115, the rolling stand F _n-1 of the tail end of the rolled material 100 is the (n-1) stage rolling stand F _n of the n-stage The deceleration start timing is determined so as to start the reduction of the rolling speed when reaching the above. Specifically, the rolling stand F _n-1 is set as the reference rolling stand F _STD , and the time difference dt is set as shown in Equation (5):

dt = (L _{ESn-1, n} −L _n ) / V _{ACT, n} (5)

That is, the deceleration start timing is determined so as to start the reduction of the rolling speed after the time difference dt represented by the equation (5) from when the tail end of the material 100 to be rolled passes through the rolling stand F _n−1. . On the other hand, if L _n ≧ L _{ESn−1, n} in step S110, the process proceeds to step S120.

If L _n <L _{ESn−1, n} + L _{ESn−2, n−1} in step S120, the tail end of the material 100 to be rolled is the n−th stage rolling stand F _n−2 and the _number of rolling stands F _n−2 in step S125. The deceleration start timing is determined so as to start the reduction of the rolling speed when reaching between the n-1 stage rolling stands _Fn-1 . Specifically, the rolling stand F _n-2 is set as the reference rolling stand F _STD , and the time difference dt is set as shown in Expression (6):

dt = (L _{ESn-1, n} + L _{ESn-2, n-1} -L _n ) / V _{ACT, n} (6)

That is, the deceleration start timing is determined so as to start the reduction of the rolling speed after the time difference dt represented by Expression (6) after the tail end of the material 100 to be rolled passes through the rolling stand F _n-2. .

Similarly, the sum of the equivalent distances between the rolling stands from the rolling stand F _n which is a reduction completion rolling stand to the reference rolling stand F _STD is longer than the rolling material length L _n and the sum of the equivalent distances is the largest. The reference rolling stand F _STD is set so as to be short, and the deceleration start timing is determined. For example, if L _n <L _{ESn−1, n} + L _{ESn−2, n−1} +... + L _{ESk, k + 1} in step S130 in FIG. 3, the tail end of the material 100 to be rolled is obtained in step S135. Is determined so that the reduction of the rolling speed starts when the temperature reaches between the k-th rolling stand F _k and the (k + 1) -th rolling stand F _{k + 1} . Specifically, the rolling stand F _k is set as the reference rolling stand F _STD , and the time difference dt is set as shown in Expression (7):

dt = (L _{ESn-1, n} + L _{ESn-2, n-1} +... + L _{ESk, k + 1} -L _n ) / V _{ACT, n} (7)

In other words, the tail end of the rolled material 100 passes through the rolling stands F _k, after a time difference dt of the formula (7), the deceleration start timing is determined so as to start the deceleration of the rolling speed.

However, if L _n ≧ L _{ESn−1, n} + L _{ESn−2, n−1} +... + L _{ESk, k + 1} in step S130, “deceleration start timing cannot be calculated” or the like in step S140. An alarm message is output and the calculation of the deceleration start timing is terminated. In this case, it can not be the rolled material 100 is decelerated to the rolling stand F _n velocity V _OUT exit the tail end of the rolling speed up through the.

For example, the equivalent distance L _{ESn-1, n} between rolling stands F _n-1 of the preceding the rolling stand F _n is decelerating complete rolling stand rolling stand F _n is, than the rolled material length L _n of the material to be rolled 100 If it is long, the deceleration start timing is set so as to start the reduction of the rolling speed between the rolling stand _Fn and the rolling stand _Fn-1 . On the other hand, when the equivalent distance L _{ESn−1, n} between the rolling stand F _n and the rolling stand F _n−1 is _{equal to} or shorter than the rolling material length L _{n of the} material to be rolled 100, the material 100 to be rolled is the rolling stand F _{n−. The} deceleration start timing is set so as to start the reduction of the rolling speed before reaching ₁ .

The tail end deceleration pattern information I including the reference rolling stand F _STD and the time difference dt calculated as described above is notified from the calculation device 12 to the speed control device 13. As described above, the deceleration start timing is determined using the reference rolling stand F _STD and the time difference dt.

  The speed control device 13 uses the tail end deceleration pattern information I and includes a deceleration start timing, and a speed command pattern that defines the rolling speed from when the material to be rolled 100 is carried into the finish continuous rolling mill 20 until it is carried out. Create Hereinafter, an example of the speed command pattern shown in FIG. 4 will be described.

Time t0 is the start time of the rolling process of the material 100 to be rolled by the finish continuous rolling mill 20. The rolling speed at this time is the running speed V _{RUN, n} . Thereafter, at time t1, deceleration of the rolling speed is started. That is, time t1 is the time of deceleration start timing. The rolling speed is decelerated at a deceleration rate β _n and reaches the tail end dropout speed V _OUT at time t2 after the deceleration time Δt from time t1. The speed difference between the running speed V _{RUN, n} and the tail end slipping speed V _OUT is ΔV. Thereafter, the rolling speed is maintained at the tail end slipping speed V _OUT until time t3 when the rolling process of the material 100 is finished. Thus, the rolling speed in the rolling process of the material 100 to be rolled by the finish continuous rolling mill 20 is defined by the speed command pattern. As shown in FIG. 4, the rolled material length L _n of the material 100 to be rolled is determined by the deceleration time Δt, the speed difference ΔV, and the deceleration rate β _n .

  Based on the speed command pattern created by the speed control device 13, the temperature control device 14 creates a temperature command pattern that defines the operation of the temperature control device 21 while the material to be rolled 100 moves in the finish continuous rolling mill 20. . The temperature adjusting device 21 of the finish continuous rolling mill 20 operates according to this temperature command pattern, and the temperature of the material 100 to be rolled is adjusted while moving in the finish continuous rolling mill 20.

For example, in order to compensate for the temperature drop of the material 100 to be rolled due to the reduction in rolling speed, a temperature command for adjusting the spray flow rate of the cooling sprays C _{1 to} C _z that lowers the temperature by spraying the material 100 with the coolant. Create a pattern. That is, the temperature command pattern is created so as to execute a spray flow rate pattern that reduces the spray flow rate sprayed onto the material 100 to be rolled as the rolling speed decreases. FIG. 5 shows an example of a temperature command pattern for adjusting the spray flow rate of the cooling sprays C _{1 to} C _z created based on the speed command pattern shown in FIG. The spray flow rate is also constant while the rolling speed is constant, and the spray flow rate is reduced while the rolling speed is reduced. FIG. 5 shows an example in which the spray flow rate is Q1 when the rolling speed is the running speed V _{RUN, n} , and the spray flow rate after the rolling speed is reduced to the tail end slipping speed V _OUT is Q2.

  As described above, the control device 10 uses the actual value of the rolling speed to calculate a speed command pattern including a deceleration start timing that reaches a desired tail end slipping speed at a desired rolling stand. Furthermore, the control apparatus 10 produces the temperature command pattern which adjusts the temperature of the to-be-rolled material 100 using a speed command pattern. That is, the control device 10 creates a control pattern for the finishing continuous rolling mill 20 including the speed command pattern and the temperature command pattern, and controls the finishing continuous rolling mill 20 using this control pattern. As a result, the occurrence of a sheet passing trouble due to the rolling speed is suppressed, and the occurrence of quality problems due to insufficient temperature accuracy is suppressed by compensating for the temperature drop of the material 100 to be rolled according to the reduction in the rolling speed. .

The operation of the control device 10 will be described below with reference to FIG. Hereinafter, the deceleration complete rolling stand is described for the case where a roll stand F _n.

In step S10, the calculation device 12 calculates the first tail end deceleration pattern information I at a preset timing, for example, the above-described entry side designation timing. That is, using the rolling speed at the entry-side designated timing and a preset deceleration rate, the time difference dt is calculated from the reference rolling stand F _STD so that the rolling speed at the deceleration completed rolling stand becomes the tail end slipping speed V _OUT. The The tail end deceleration pattern information I including the calculated reference rolling stand F _STD and the time difference dt is notified from the calculation device 12 to the speed control device 13. Based on the tail end deceleration pattern information I, the speed control device 13 creates a speed command pattern Ps.

  In step S20, the speed control device 13 controls the finish continuous rolling mill 20 based on the speed command pattern Ps. That is, the speed control device 13 controls the rolling speed of the material to be rolled 100 conveyed in the finish continuous rolling mill 20 so as to realize the rolling speed defined in the speed command pattern Ps.

In step S <b> 30, the calculation device 12 uses the method described with reference to FIG. 3 to each of the rolling stands F ₁ to F every time the material to be rolled 100 is conveyed within the finish continuous rolling mill 20 for a certain length. _A time difference dt from the reference rolling stand F _STD is newly calculated with the rolling stand F _n preselected from _z as a reduction completed rolling stand. That is, using the running speed V _{RUN, n} monitored by the speed monitor device 11 and a predetermined reduction rate β _n , the rolling speed when the material 100 passes through the rolling stand F _n is preset at the tail end. The reference rolling stand F _STD and the time difference dt are calculated so as to be the withdrawal speed V _OUT . As already described, the deceleration start timing is determined from the tail end deceleration pattern information I including the reference rolling stand F _STD and the time difference dt. Based on the calculated reference rolling stand F _STD and tail end deceleration pattern information I including the time difference dt, the speed control device 13 creates a new speed command pattern Ps.

  In step S <b> 40, the temperature control device 14 creates a temperature command pattern Pt that compensates for the temperature drop of the material to be rolled 100 according to the reduction of the rolling speed, based on the newly created speed command pattern Ps.

In step S50, the speed control device 13 controls the adjustment of the rolling speed by the finish continuous rolling mill 20 based on the speed command pattern Ps. That is, the driving devices M _{1 to} M _z are controlled by the speed control device 13 so as to realize the rolling speed defined in the speed command pattern Ps, and the rolling speed of the material 100 to be rolled is adjusted. For this reason, at the deceleration start timing calculated by the calculation device 12, the rolling speed starts decreasing at a predetermined deceleration rate. Simultaneously with the control of the rolling speed by the speed control device 13, the temperature control device 14 controls the temperature adjusting device 21 of the finishing continuous rolling mill 20 based on the temperature command pattern Pt. That is, the temperature control device 21 is controlled by the temperature control device 14 so as to realize the temperature control operation defined in the temperature command pattern Pt, and the temperature of the material 100 to be rolled is adjusted. However, if the deceleration start timing cannot be calculated in step S30, an alarm message is output as described above, and the calculation of the deceleration start timing is terminated. When a new deceleration start timing cannot be calculated in this way, the control device 10 controls the finish continuous rolling mill 20 using the latest speed command pattern Ps and temperature command pattern Pt calculated immediately before.

  If the rolling process has not been completed for the material to be rolled 100 in step S60, the process returns to step S30, and each time the material to be rolled 100 is conveyed through the finish continuous rolling mill 20 for a certain length, a speed command pattern. Ps and temperature command pattern Pt are newly created. On the other hand, when the rolling process of the material 100 to be rolled is finished, the control of the finish continuous rolling mill 20 by the control device 10 is finished.

As described above, the control device 10, the entrance side of the finishing continuous rolling mill 20 each time the rolled material 100 passes a certain length, by monitoring the drive device M ₁ ~M _z finishing continuous rolling mill 20 Using the actual value of the obtained rolling speed, a deceleration start timing is calculated so as to reach a desired tail end slipping speed at a desired rolling stand. For this reason, even if the rolling speed is changed by dynamic control after the deceleration start timing is calculated, the deceleration start timing is newly calculated using the changed rolling speed. That is, the calculation accuracy of the deceleration start timing can be improved. Moreover, the accuracy of temperature control of the material 100 to be rolled can be improved by creating the temperature command pattern using the speed command pattern including the deceleration start timing.

  Therefore, according to the control device 10 according to the embodiment of the present invention, finish continuous rolling that can suppress the occurrence of sheet passing trouble due to the rolling speed and can control the temperature of the material to be rolled according to the reduction of the rolling speed. The control device, the control method, and the control pattern creation method of the machine 20 can be provided.

(Other embodiments)
As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

In the description of the embodiment already described, an example in which the rolling speed detected by the driving devices M _{1 to} M _z of the finishing continuous rolling mill 20 is monitored has been shown. However, the speed monitor device 11 may detect the rolling speed by directly monitoring the rotation speed of the motor that drives the rolling stands F _{1 to} F _z .

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  The finishing continuous rolling mill control technology of the present invention can be used in the manufacturing industry for rolling materials.

M _{1 to} M _z drive unit F _{1 to} F _z rolling stand C _{1 to} C _z cooling spray 10 control unit 11 speed monitor unit 12 calculation unit 13 speed control unit 14 temperature control unit 20 finish Continuous rolling mill 21 ... Temperature control device 31, 32 ... Movement amount detection sensor 41 ... Finishing side thermometer 42 ... Finishing side thermometer 100 ... Rolled material

Claims (15)

A control device for a finishing continuous rolling mill in which a plurality of rolling stands are continuously arranged,
A speed monitoring device that monitors in real time the rolling speed at which the material to be rolled moves in the finish continuous rolling mill;
Each time the material to be rolled is transported in the finish continuous rolling mill for a certain length, a reduction completion rolling stand selected from the plurality of rolling stands is used for the rolling using the rolling speed and a predetermined reduction rate. A calculation device for calculating a deceleration start timing for starting deceleration of the rolling speed so that the rolling speed becomes a preset tail end slipping speed when the material passes through;
A speed control device for controlling adjustment of the rolling speed by the finishing continuous rolling mill so as to start deceleration of the rolling speed at the deceleration rate at the deceleration start timing;
A finishing controller comprising: a temperature control device that controls temperature adjustment of the material to be rolled by the finishing continuous rolling mill so as to compensate for a temperature change of the material to be rolled due to a reduction in the rolling speed. Control device for rolling mill. The speed control device comprises:
The length of the passing portion of the material to be rolled that passes through the reduction completion rolling stand while the rolling speed is reduced, and an equivalent distance based on the exit side of the reduction completion rolling stand between each of the plurality of rolling stands, The control device for the finishing continuous rolling mill according to claim 1, wherein the deceleration start timing is calculated using a. The speed control device comprises:
Identify the reference rolling stand so that the sum of the equivalent distances between the rolling stands from the deceleration completed rolling stand is longer than the length of the passing portion of the material to be rolled,
Setting the deceleration start timing so that the rolling speed starts decreasing when the tail end of the material to be rolled reaches between the reference rolling stand and the next rolling stand of the reference rolling stand. The finishing continuous rolling mill control device according to claim 2. The speed control device includes the deceleration start timing, and creates a speed command pattern that defines the rolling speed from when the material to be rolled is carried into the finishing continuous rolling mill until it is unloaded,
Based on the speed command pattern, the temperature control device creates a temperature command pattern that regulates temperature adjustment of the material to be rolled to be executed by the finishing continuous rolling mill so as to compensate for the temperature change of the material to be rolled. The control apparatus for a finish continuous rolling mill according to any one of claims 1 to 3.   The speed monitoring device monitors the rolling speed by monitoring a speed detecting device that detects the rolling speed from rotation of a motor of the finishing continuous rolling mill that drives the plurality of rolling stands. The control apparatus for a finishing continuous rolling mill according to any one of claims 1 to 4.   The temperature control device controls the temperature adjustment of the material to be rolled by the finishing continuous rolling mill by controlling the spray amount of the cooling spray of the finishing continuous rolling mill that lowers the temperature of the material to be rolled. The control device for a finishing continuous rolling mill according to any one of claims 1 to 5. A control method of a finishing continuous rolling mill in which a plurality of rolling stands are arranged continuously,
Monitoring the rolling speed at which the material to be rolled moves in the finishing continuous rolling mill in real time;
Each time the material to be rolled is transported in the finish continuous rolling mill for a certain length, a reduction completion rolling stand selected from the plurality of rolling stands is used for the rolling using the rolling speed and a predetermined reduction rate. Calculating a deceleration start timing for starting deceleration of the rolling speed so that the rolling speed becomes a preset tail end slipping speed when the material passes through;
Controlling the adjustment of the rolling speed by the finishing continuous rolling mill so as to start deceleration of the rolling speed at the deceleration rate at the deceleration start timing;
Controlling a temperature adjustment of the material to be rolled by the finish continuous rolling mill so as to compensate for a temperature change of the material to be rolled due to a reduction in the rolling speed. Control method. Calculating the deceleration start timing,
The length of the passing portion of the material to be rolled that passes through the reduction completion rolling stand while the rolling speed is reduced, and an equivalent distance based on the exit side of the reduction completion rolling stand between each of the plurality of rolling stands, The method for controlling the finishing continuous rolling mill according to claim 7, wherein the deceleration start timing is calculated using Calculating the deceleration start timing,
Identifying a reference rolling stand so that the sum of the equivalent distances between the rolling stands from the deceleration completed rolling stand is longer than the length of the passing portion of the material to be rolled;
A step of setting the deceleration start timing so as to start the reduction of the rolling speed when the tail end of the material to be rolled reaches between the reference rolling stand and the next rolling stand of the reference rolling stand. The method for controlling a finishing continuous rolling mill according to claim 8, comprising: Including a speed reduction start timing, and creating a speed command pattern that defines the rolling speed until the material to be rolled is carried into the finishing continuous rolling mill and then unloaded;
Creating a temperature command pattern that regulates the temperature adjustment of the material to be rolled to be executed by the finishing continuous rolling mill so as to compensate for the temperature change of the material to be rolled based on the speed command pattern. A method for controlling a finishing continuous rolling mill according to any one of claims 7 to 9.   11. The step of controlling the temperature adjustment of the material to be rolled, wherein the spray amount of the cooling spray of the finishing continuous rolling mill that lowers the temperature of the material to be rolled is controlled. 2. A control method for a finishing continuous rolling mill according to item 1. A method for creating a control pattern for controlling a finishing continuous rolling mill in which a plurality of rolling stands are continuously arranged,
Monitoring the rolling speed at which the material to be rolled moves in the finishing continuous rolling mill in real time;
Each time the material to be rolled is transported in the finish continuous rolling mill for a certain length, a reduction completion rolling stand selected from the plurality of rolling stands is used for the rolling using the rolling speed and a predetermined reduction rate. Calculating a deceleration start timing for starting deceleration of the rolling speed so that the rolling speed becomes a preset tail end slipping speed when the material passes through;
Including a speed reduction start timing, and creating a speed command pattern that defines the rolling speed until the material to be rolled is carried into the finishing continuous rolling mill and then unloaded;
Based on the speed command pattern, a temperature command pattern that regulates the temperature of the material to be rolled to be executed by the finishing continuous rolling mill so as to compensate for a temperature change of the material to be rolled due to a reduction in the rolling speed. A method for creating a control pattern for a finishing continuous rolling mill, comprising the steps of: Calculating the deceleration start timing,
The length of the passing portion of the material to be rolled that passes through the reduction completion rolling stand while the rolling speed is reduced, and an equivalent distance based on the exit side of the reduction completion rolling stand between each of the plurality of rolling stands, The deceleration start timing is calculated using a control pattern creating method for a continuous continuous rolling mill according to claim 12. Calculating the deceleration start timing,
Identifying a reference rolling stand so that the sum of the equivalent distances between the rolling stands from the deceleration completed rolling stand is longer than the length of the passing portion of the material to be rolled;
A step of setting the deceleration start timing so as to start the reduction of the rolling speed when the tail end of the material to be rolled reaches between the reference rolling stand and the next rolling stand of the reference rolling stand. The method for creating a control pattern for a finishing continuous rolling mill according to claim 13, comprising:   The temperature command pattern is a control pattern that defines a spray amount of a cooling spray of the finishing continuous rolling mill that lowers the temperature of the material to be rolled. The control pattern creation method of the finishing continuous rolling mill as described.

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