JP4050201B2 - Control method for rolling material cooling device - Google Patents

Description

  The present invention relates to a method for controlling a rolling device cooling apparatus.

Conventionally, a rolled material such as a thin steel material is manufactured by introducing a heated slab into a plurality of rolling mills (tandem rolling mills) and performing continuous rolling. The rolled material after rolling is cooled under appropriate conditions by a cooling device that adjusts the temperature of the rolled material by spraying or dropping water or other coolant, and then wound at the end of the production line. It is designed to be wound on a take-up machine (coiler).
As a method for controlling the cooling device, for example, there is one described in Patent Document 1. The technique described in this document calculates the temperature drop amount of each part of the rolled material by the cooling device based on the set transfer speed of the rolled material, the set temperature at the entrance side of the cooling device, etc. Based on this, the cooling device was controlled to control the temperature of the rolled material.
JP-B 62-22687 (pages 30-33, Figs. 6 and 7)

However, this cooling device control method is effective when the rolled material is being rolled constantly, and the final stage of rolling, that is, after the tail end of the rolled material has passed through the final rolling mill. It could not cope with the control of the cooling device in the unsteady state.
Specifically, after the rolled material passes through the final rolling mill, the tail end portion becomes a free end, and a so-called “bottom-out” state occurs in which the rolling material transfer speed changes rapidly. In order to suppress the situation, the transporting roller and the coiler are controlled to bring the rolling material transporting speed close to the set value, but in practice it is difficult to make the transporting speed constant.

Under such circumstances, in order to optimize the cooling (temperature adjustment) of the rolled material by the cooling device, it is difficult to cope with the technique of Patent Document 1.
Accordingly, in view of the above problems, the present invention provides a control method for a rolling material cooling device that enables optimum temperature control of the rolled material when the tail end portion of the rolled material is a free end. It is the purpose.

In order to achieve the above object, the present invention takes the following technical means.
That is, the control method of the rolling material cooling device according to the present invention is arranged between the final rolling mill and the winder of the continuous rolling line, and the temperature of the rolling material is controlled by controlling the supply amount of the cooling material. When controlling the cooling device for a rolled material having a plurality of cooling sections to be controlled in the rolling material transfer direction after the tail end of the rolled material has passed through the final rolling mill, a predetermined position on the rolled material is within the cooling device. An actual transfer speed when passing through a predetermined cooling section is obtained, a speed deviation between the actual transfer speed and a preset set transfer speed is obtained, and a downstream side of the predetermined cooling section is obtained based on the speed deviation. Controlling the control cooling section provided .

According to this technical means, the tail end portion of the rolled material is a free end by controlling the control cooling section on the downstream side in the transfer direction from the deviation between the set value of the transport speed of the rolled material and the actual value. In this case, the optimum temperature control of the rolled material can be made possible.
Another control method according to the present invention is a cooling section that is disposed between a final rolling mill and a winder of a continuous rolling line, and controls the temperature of the rolled material by controlling the amount of supplied coolant. In the rolling material cooling device comprising a plurality of rolling material in the rolling material transfer direction, after the tail end portion of the rolling material has passed through the final rolling mill, the preset value of the rolling material transfer information and the actual value thereof are set. When the deviation is obtained and the control cooling section is controlled based on the deviation, the transfer information is a transfer speed of the rolled material, and the predetermined position on the rolled material is the first cooling of the cooling device by the cooling device. A speed deviation between the actual transfer speed when passing through the section and the actual transfer speed when passing through the second cooling section located downstream of the first cooling section is obtained, and the second cooling section is determined based on the speed deviation. More downstream And controlling the controlled cooling section are provided.

Preferably, the temperature variation of the rolled material due to the speed deviation is calculated, and the control cooling section is controlled based on the temperature variation.
More preferably, the control cooling section may be controlled using a differential value of the speed deviation.
Another control method according to the present invention is a cooling section that is disposed between a final rolling mill and a winder of a continuous rolling line, and controls the temperature of the rolled material by controlling the amount of supplied coolant. When controlling the rolling device cooling device comprising a plurality of rolling material in the rolling material transfer direction after the tail end portion of the rolling material has passed through the final rolling mill, a predetermined position on the rolling material is a first cooling section in the cooling device. The actual transfer speed when passing through the first cooling section and the actual transfer speed when passing through the second cooling section located downstream of the first cooling section are obtained, and the first cooling section and the second cooling are determined from these actual transfer speeds. The actual passing time of the rolled material with respect to the section is obtained, and the passing time of the rolled material on the downstream side of the second cooling section is predicted based on the actual passing time, and based on the predicted passing time. Te, and controlling the controlled cooling section located downstream of the second cooling section.

Preferably, after measuring the actual transfer speed of the rolled material in the third cooling section located on the downstream side of the second cooling section and the upstream side of the control cooling section, rolling to the third cooling section is performed from the actual transfer speed. The actual passage time of the material is obtained, the predicted passage time is corrected based on the actual passage time in the third cooling section, and the control cooling section is adjusted based on the predicted passage time after the correction. It is good to control.
Preferably, the temperature variation of the rolled material is calculated from the predicted passage time, and the control cooling section is controlled based on the temperature variation.

In addition, it is very preferable that the control cooling section described above includes a plurality of cooling nozzles and the coolant flow rate is controlled by changing the number of operating cooling nozzles.
By doing so, not only can the on / off control of each cooling nozzle be performed, but also the control of making the flow rate of the coolant injected from the cooling nozzle variable is possible, and the optimum temperature control of the rolled material can be performed.

  When the tail end portion of the rolled material is a free end, the optimum temperature control of the rolled material can be performed by controlling the cooling device according to the present invention.

Hereinafter, the control method of the rolling device cooling device according to the present invention will be described by exemplifying continuous rolling of a thin steel plate.
A rolled material such as a thin steel plate is manufactured by introducing a heated slab into a continuous rolling device (tandem rolling mill) provided with a plurality of rolling mills and continuously rolling the slab. The rolling mill provided on the upstream side of the continuous rolling apparatus is a rough rolling mill, and the rolling mill provided on the downstream side is a finish rolling mill that adjusts sheet thickness and the like.
The rolled material that has exited the finish rolling mill provided in the final stage is cooled while passing through a cooling device arranged in the rolling material transfer direction, and is wound around a coiler that is a winder.

FIG. 1 is a conceptual diagram showing a device configuration from the final stage finishing mill 1 to the cooling device 2 and the coiler 3 of the continuous rolling device.
In the description of the present embodiment, the final rolling mill is simply referred to as the rolling mill 1. In the transfer direction of the rolled material 4, the side (coiler 3 side) that is transferred is called the downstream side, and the opposite side (final rolling mill 1 side) is called the upstream side.
The rolling mill 1 has, for example, a pair of work rolls 5 and a pair of backup rolls 6 for backing them up.

An entrance side thermometer for measuring the temperature of the rolled material 4 is installed on the downstream side of the rolling mill 1, and the entrance side thermometer 7 includes a radiation thermometer and the like. A cooling device 2 is provided on the downstream side.
The cooling device 2 includes cooling sections Pi on the upper and lower (front and back) surfaces of the rolled material 4, and is arranged so that N cooling sections Pi are connected in the rolling material transport direction.
As shown in FIG. 2, the cooling section Pi is provided with a plurality of cooling nozzles 10 that spray the coolant 9 toward the rolled material 4 to lower the temperature of the rolled material 4, and each cooling nozzle 10 has a coolant. 9 is provided with a cooling valve 11 that can change or turn on / off the flow rate of.

An exit side thermometer 12 is installed on the exit side of the cooling device 2, and the exit side thermometer 12 includes a radiation thermometer and the like. On the rear side, a coiler 3 for winding the rolled material 4 that has been rolled is provided. A rotational speed meter 13 for measuring the rotational speed (rotational speed) of the shaft is installed on the rotational shaft of the coiler 3.
Conveying means provided between the rolling mill 1 and the coiler 3 is provided with a conveying roller 14 for conveying the rolled material 4.
In addition, the cooling device 2 has a transfer speed detection unit 15 that calculates the transfer speed of the rolled material 4 based on the rotation speed and the rotation radius of the coiler 3, and while tracking a predetermined point A on the rolled material 4, This point A has a plate position detector 16 that detects that the predetermined cooling sections P0, P1, P2, and P3 have been reached.

In the present embodiment, in a continuous rolling apparatus (continuous rolling line) having N cooling sections, the cooling section P0 located upstream and in a predetermined position is the first cooling section, and is located downstream of the cooling section P0. The cooling section P1 is a second cooling section. Further, on the downstream side of the cooling section P1, a cooling section P2 for detecting the control timing is considered, and the cooling section P3 existing between the cooling section P2 and the cooling section P1 is defined as a third cooling section.
The first to third cooling sections indicate a relative positional relationship with each other, and do not mean the first to third of the 1 to N continuous cooling sections.

Further, a calculation unit 17 for deriving the number of operating cooling nozzles 10 located downstream based on the control method of the cooling device 2 described later using the data of the plate position detection unit 16 and the transfer speed detection unit 15 as input values. A cooling nozzle controller 18 that controls the operating state of the cooling nozzle 10 based on data from the calculation unit 17 is provided.
By the way, the rolled material 4 rolled by the continuous rolling apparatus is continuously rolled at a predetermined transfer speed by a plurality of rolling mills, but the tail end portion 19 of the rolled material 4 has left the final rolling mill 1. After that, since the tail end portion 19 becomes a free end and the binding force is lost, the transfer speed changes rapidly.

In order to prevent this, the transport roller 14 and the coiler 3 provided in the transport means are controlled to adjust the transport speed of the rolled material 4, but it is difficult to maintain the predetermined transport speed. is there.
Therefore, if the cooling device 2 is operated under the cooling conditions during continuous rolling in the bottom-out state, the rolled material 4 cannot be brought to a predetermined temperature by the time of winding the coiler 3, which causes performance deterioration. It was.
Therefore, in the first embodiment of the control method for the rolling material cooling device according to the present invention, the cooling device 2 is controlled by sequentially performing steps S11 to S14 shown in the flowchart of FIG. Control is performed.

First, after the tail end portion 19 of the rolled material 4 has passed through the final rolling mill 1, that is, immediately after the bottom end, the plate position detecting unit 16 sets the control target point located in the cooling section P0 as A on the rolled material 4. Pay attention as a point. The position of the point A is always managed by a computer, for example, and the fact that the point A has reached the cooling section Pi is recognized on the computer.
The transfer speed when the point A passes through the cooling section P0 is detected and set as the actual transfer speed V0. At this time, the transfer speed of the rolled material 4 is calculated by the transfer speed detecting unit 15 with the rotation speed meter 13 provided in the coiler 3 and the radius of the rolled material 4 wound around the coiler 3 as inputs. Yes. (S11)
Next, the calculation unit 17 obtains a speed deviation ΔV = V0−Vs between the obtained actual transfer speed V0 and the preset transfer speed Vs preset in the cooling section P0. (S12)
Further, the calculation unit 17 uses the speed deviation ΔV as an input value to calculate the number B of cooling nozzles to be activated in the cooling section P2 when the point A reaches the cooling section P2. For example, when the speed deviation ΔV is negative, the actual transfer speed is slow, so the number B of cooling nozzles to be operated is reduced, and when ΔV is positive, the actual transfer speed is high, so the cooling nozzles to be operated The number B is increased. (S13)
Thereafter, the transfer of the rolled material 4 proceeds, and the point A on the rolled material 4 is provided in the cooling section P2 through the cooling nozzle controller 18 at the timing when the plate position detection unit 16 detects that the point A has reached the cooling section P2. Further, the B cooling nozzles 10 are set in an operating state, and the coolant 9 is sprayed onto the rolled material 4. (S14)
Note that the cooling nozzle controller 18 does not control only the cooling nozzle 10 provided in the cooling section P2, but depending on the type of rolling material 4 and rolling conditions, the cooling nozzle 10 provided in another cooling section Pi. And the rolling material 4 is cooled by using the cooling nozzles 10 of the plurality of cooling sections Pi together.

The above-described control processing steps S11 to S14 are performed a plurality of times for each control cycle (for example, the length of rolled material of several m).
The flowchart of FIG. 4 shows a second embodiment of the control method for the rolling material cooling device according to the present invention.
The present embodiment is greatly different from the first embodiment in that the temperature fluctuation ΔT of the rolled material 4 due to the speed deviation ΔV is calculated, and the downstream cooling section is controlled based on the temperature fluctuation ΔT. The others are substantially the same.

After the bottom of the rolled material 4, the point A on the rolled material 4 calculates the transfer speed when passing through the cooling section P 0 to obtain the actual transfer speed V 0, and the set transfer speed Vs preset in the cooling section P 0. The speed deviation ΔV = V0−Vs is obtained. (S21, S21)
Next, the calculation unit 17 calculates the temperature fluctuation ΔT that is received before the point A passes through the cooling section P2 from the speed deviation ΔV and the influence coefficient K obtained in advance. For example, ΔT = K · ΔV. (S23)
Further, the calculation unit 17 calculates the required cooling nozzle operating number B from the ΔT and the temperature drop dT of the rolled material 4 when one cooling nozzle 10 is in an operating state. For example, B = ΔT / dT. (S24)
Thereafter, the timing at which the point A actually reaches the cooling section P2 is detected by the plate position detection unit 16, and the B cooling nozzles 10 provided in the predetermined cooling section Pi are in an operating state via the cooling nozzle controller 18. And (S25)
The above-described control processing steps S21 to S25 are performed a plurality of times for each control cycle (for example, the rolling material length is several m pitch).

An example of the result when the cooling device 2 is controlled by the control method according to the present embodiment is shown in FIGS.
The horizontal axis of Fig.10 (a) has shown the length of the rolling material 4 wound up by the coiler 3, and the vertical axis | shaft has shown the conveyance speed of the rolling material.
When the length of the non-tensioned state (plate length) at the tail end 19 is about 130 m (A in the figure), the rolled material 4 has a bottom end, and is transferred after the bottom end. The speed is set to be constant at about 11 m / sec.

However, the actual transfer speed once decreases rapidly and then increases again to reach the set speed.
FIG. 10B shows the temperature error when the rolling material changes in such a speed and when the cooling method according to the present invention is applied and when it is not.
As is clear from FIG. 10B, when the control of the cooling device 2 is not performed at all, the plate length is 0 m and the temperature error is −20 ° C. or less. When applied, the temperature error is within about ± 5 ° C.

The flowchart of FIG. 5 shows a third embodiment of the control method of the cooling device for rolled material according to the present invention.
This embodiment is largely the same as the first embodiment except that the cooling section Pi is controlled using the differential value of the speed deviation ΔV, and the others are substantially the same.
That is, after the bottom of the rolled material 4, as in the first embodiment, the transfer speed when the point A on the rolled material 4 passes through the cooling section P 0 is calculated and the actual transfer speed V 0 is set in advance. A speed deviation ΔV = V0−Vs with respect to the set transfer speed Vs in the cooling section P0 is obtained. (S31, S32)
The calculation unit 17 performs a process of multiplying the differential value of the speed deviation ΔV obtained in this way by the time t (for example, the deviation of ΔV in the control cycle) and the gain obtained in advance, and is necessary based on that. The control amount of the number of cooling nozzles (the number of cooling nozzles to be changed) dB is calculated. (S33)
Thereafter, the control amount dB is output to the cooling section P2 via the cooling nozzle controller 18 at the timing when the point A actually reaches the cooling section P2. (S34) Depending on the type of rolling material 4 and rolling conditions, the cooling nozzle 10 provided in another cooling section Pi is controlled based on the control amount dB.

The above-described control processing steps S31 to S34 are performed a plurality of times for each control cycle (for example, the length of rolled material of several m).
In the flowchart of FIG. 6, 4th Embodiment of the control method of the cooling device of the rolling material concerning this invention is shown.
After the bottom of the rolled material 4, first, the plate position detection unit 16 pays attention to the control target point located in the cooling section P 0 as the point A on the rolled material 4.
Next, the transfer speed when the point A passes through the cooling section P0 is detected by the transfer speed detector 15 to obtain the actual transfer speed V0, which is the preset transfer speed Vs in the cooling section P0. Deviation ΔV = V0−Vs is obtained. (S41, S42)
In the calculating part 17, the temperature fluctuation (DELTA) T received before the point A passes the cooling section P2 is calculated from the speed deviation (DELTA) V and the influence coefficient K calculated | required previously. For example, ΔT = K · ΔV. (S43)
The required number of cooling nozzles B is calculated by the calculation unit 17 from ΔT thus obtained and the temperature drop dT of the rolled material 4 when one cooling nozzle 10 is in the operating state. For example, B = ΔT / dT. (S44)
On the other hand, in the calculation unit 17, a differential value of the speed deviation ΔV is obtained, and a differential control amount dB of the number of cooling nozzles 10 is calculated by multiplying this by a gain. (S46)
Thereafter, at the timing when the plate position detection unit 16 detects that the point A has actually reached the cooling section P <b> 2, the B + dB cooling nozzles 10 are put into operation via the cooling nozzle controller 18. (S45).

The above-described control processing steps S41 to S46 are performed a plurality of times for each control cycle (for example, the rolling material length is several m pitch).
An example of the result when the cooling device 2 is controlled by this control method is shown in FIG. When the control of the present embodiment is applied, the largest temperature error is about −10 ° C., and it can be seen that optimum temperature control is performed.
The flowchart of FIG. 7 shows a fifth embodiment of the control method for the rolling material cooling device according to the present invention.

In this embodiment, in the cooling device 2, two cooling sections are considered: a first cooling section and a second cooling section. The cooling section P0 in FIG. 1 is a first cooling section, and the cooling section P1 is a second cooling section.
There is a cooling section P0 on the upstream side of the cooling device 2, and the cooling section P1 is located on the downstream side thereof. The cooling section P2 to be controlled is located on the downstream side of the cooling section P1, and a plurality of other cooling sections Pi exist between P1 and P2.
First, after the bottom of the rolled material 4, the plate position detection unit 16 pays attention to a control target point located in the cooling section P <b> 0 as a point A on the rolled material 4.

Next, the transfer speed at the time when the point A passes through the cooling section P0 is detected by the transfer speed detector 15 and is set as the actual transfer speed V0. (S51)
Further, when the plate position detection unit 16 detects that the point A has reached the cooling section P1, the actual transfer speed V1 of the rolled material 4 at that time is detected by the transfer speed detection unit 15. (S52)
Thereafter, the passage times t0 and t1 of each cooling section Pi are calculated from the V0 and V1 and the length of the cooling sections P0 and P1 in the direction of transport of the rolled material. (S53)
From the obtained t0 and t1, the time for the rolling material 4 to pass through the cooling section Pi located between the cooling sections P1 and P2, that is, the passage time ti is predicted. (S54)
Using each of these obtained ti and the influence coefficient K calculated in advance, a temperature fluctuation ΔT that is received before the point A on the rolled material 4 passes through the cooling section P2 is calculated. (S55)
From the ΔT thus obtained and the cooling capacity per one cooling nozzle 10, that is, the temperature drop dT, the number B of cooling nozzles necessary for suppressing the temperature fluctuation of the rolled material 4 is calculated. For example, B = ΔT / dT. (S56)
It should be noted that all of S53 to S56 are calculated in the calculation unit 17.

After stepping these steps (S51 to S56), at the timing when the plate position detection unit 16 detects that the point A on the rolled material 4 passes through the cooling section P2, the cooling section is passed through the cooling nozzle controller 18. The B cooling nozzles 10 provided in the P2 or the plurality of cooling sections Pi are set in an operating state. (S57)
The above-described control processing steps S51 to S57 are performed a plurality of times for each control cycle (for example, a rolling material length of several m pitch).
The flowchart of FIG. 8 shows a sixth embodiment of the control method for the rolling material cooling device according to the present invention.

In this embodiment, as in the fifth embodiment, two cooling section sections P0 and P1 on the cooling device will be considered. A cooling section P0 (first cooling section) on the upstream side of the cooling device 2 and a cooling section P1 (second cooling section) located on the downstream side of P0.
The cooling section P2 is located on the downstream side of the cooling section P1. A plurality of other cooling sections Pi exist between P1 and P2, and one of them is focused on as a cooling section P3 (Pi, i = 3), and this is defined as a third cooling section.

First, after the bottom of the rolled material 4 is passed, the actual transfer speed V0 when the point A on the rolled material 4 passes through the cooling section P0 is determined by the transfer speed detecting unit 15 with the characteristic values of the coiler 3 (the number of rotations and the rotation radius). Based on (S61)
Further, when the plate position detection unit 16 detects that the point A has reached the cooling section P1, the transfer speed detection unit 15 detects the actual transfer speed V1 of the rolled material 4. (S62)
Thereafter, the calculation unit 17 calculates the passage times t0 and t1 of the cooling sections P0 and P1 from the lengths V0 and V1 and the lengths of the cooling sections P0 and P1 in the rolling material transfer direction. (S63)
From the obtained t0 and t1, the passing time ti through which the rolled material 4 passes through the cooling section Pi located between the cooling sections P1 and P2 is predicted. (S64)
On the other hand, in another processing step in the calculation unit 17, the actual transfer speed V3 when the point A on the rolled material 4 passes through the cooling section P3 is measured (S601), and the length of the cooling section P3 in the rolling material transfer direction is measured. Then, the passage time t3 of the cooling section P3 is calculated. (S602)
The correction amount of ti (i = 3) is calculated by taking the difference between the calculated t3 and the predicted passage time ti (i = 3) of the cooling section P3. (S603)
Based on this correction amount, ti corresponding to the cooling section P3 is corrected. (S65)
Thereafter, using each of these obtained ti (including i = 3) and the influence coefficient K calculated in advance, a temperature fluctuation ΔT that is received before the point A on the rolled material 4 passes through the cooling section P2 is calculated. To do. (S66)
The number B of cooling nozzles in the cooling section Pi necessary to suppress the temperature fluctuation of the rolled material 4 is calculated from ΔT thus obtained and the cooling capacity per cooling nozzle 10, that is, the temperature drop dT. To do. For example, B = ΔT / dT. (S67)
After taking this step, the B cooling nozzles 10 are operated via the cooling nozzle controller 18 at the timing when the plate position detection unit 16 detects that the point A on the rolled material 4 passes the cooling section P2. And so on. (S68)
The above-described control processing steps S61 to S68 and S601 to S603 are performed a plurality of times for each control cycle (for example, the length of the rolled material is several m pitch).

The flowchart of FIG. 9 shows a seventh embodiment of the control method of the rolling material cooling device according to the present invention.
This embodiment is different from the sixth embodiment in the configuration of processing steps in the following points.
That is, the speed difference ΔV between the actual transfer speeds V0 and V1 measured in the cooling sections P0 and P1 is calculated in the calculation unit 17. ΔV = V0−V1. Then, after calculating the differential value of ΔV, the control value Bd for the required number of operating cooling nozzles 10 is calculated by multiplying the differential value by a gain. (S704)
In addition, at the timing when the plate position detection unit 16 detects that the point A passes through the cooling section P2, the operation number of the cooling nozzles 10 in the predetermined cooling section Pi is set to B + Bd instead of B. The output is made via the cooling nozzle controller 18. (S78)
The other processing steps (S71 to S77, S701 to S703) are substantially the same as those in the sixth embodiment, and the operational effects thereof are also substantially the same.

In addition, the control method of the cooling apparatus of the rolling material concerning this invention is not limited to the said embodiment.
That is, in the present embodiment, the number of operations of the cooling nozzle 10 is controlled, but the opening / closing amount of the cooling valve 11 of the cooling nozzle 10 is controlled, and the flow rate, that is, the supply amount of the coolant 9 is controlled. Also good.
In the first to seventh embodiments, the cooling device 2 has been described as an example having the transfer speed detection unit 15, the plate position detection unit 16, the calculation unit 17, and the cooling nozzle controller 18. These units 15, 16, 17, and 18 do not necessarily have to be included, and the control processing steps performed in the units 15, 16, and 17 do not necessarily have to be the same as in the embodiment. In other words, any device that controls the cooling device 2 as in the processing steps shown in the flowcharts of FIGS. 3 to 9 of the illustrated embodiment falls within the scope of the technical idea of the present invention.

It is a figure which shows the cooling device of a rolling material. It is an enlarged view of a cooling section. It is a flowchart which shows 1st Embodiment of this invention. It is a flowchart which shows 2nd Embodiment of this invention. It is a flowchart which shows 3rd Embodiment of this invention. It is a flowchart which shows 4th Embodiment of this invention. It is a flowchart which shows 5th Embodiment of this invention. It is a flowchart which shows 6th Embodiment of this invention. It is a flowchart which shows 7th Embodiment of this invention. (A) is a figure which shows the conveyance speed of the rolling material after a tail fall, (b) is a figure which shows the result of applying the control method concerning this invention to a cooling device.

Explanation of symbols

1 (final stage) rolling mill 2 cooling device 3 coiler (winding machine)
4 Rolled material 10 Cooling nozzle 11 Cooling valve Pi Cooling section

Claims (8)

Cooling of the rolled material provided with a plurality of cooling sections arranged in the rolling material transfer direction, which are arranged between the final rolling mill and the winder of the continuous rolling line and control the temperature of the rolled material by controlling the supply amount of the cooling material. the device, upon braking to control after the tail end of the rolled material leaves the final rolling mill,
Obtain an actual transfer speed when a predetermined position on the rolled material passes a predetermined cooling section in a cooling device, determine a speed deviation between the actual transfer speed and a preset set transfer speed, and the speed deviation And a control cooling section provided on the downstream side of the predetermined cooling section based on the control method. Cooling of the rolled material provided with a plurality of cooling sections arranged in the rolling material transfer direction, which are arranged between the final rolling mill and the winder of the continuous rolling line and control the temperature of the rolled material by controlling the supply amount of the cooling material. In the apparatus, after the tail end of the rolled material has passed through the final rolling mill, the deviation between the preset value of the transfer information of the rolled material and the actual value is obtained, and the control cooling section is based on the deviation. In controlling
The transfer information is a transfer speed of the rolled material,
In the cooling device, the actual position when the predetermined position on the rolled material passes through the first cooling section of the cooling device and the second cooling section located downstream of the first cooling section. A method for controlling a rolling material cooling apparatus, comprising: obtaining a speed deviation from a transfer speed and controlling a control cooling section provided downstream of the second cooling section based on the speed deviation . The method for controlling a rolling material cooling device according to claim 1 or 2 , wherein a temperature fluctuation of the rolled material due to the speed deviation is calculated, and the control cooling section is controlled based on the temperature fluctuation . The method for controlling a rolling device cooling apparatus according to any one of claims 1 to 3, wherein the control cooling section is controlled using a differential value of the speed deviation . Cooling of the rolled material provided with a plurality of cooling sections arranged in the rolling material transfer direction, which are arranged between the final rolling mill and the winder of the continuous rolling line and control the temperature of the rolled material by controlling the supply amount of the cooling material. In controlling the apparatus after the tail end of the rolled material has exited the final rolling mill,
The actual transfer speed when the predetermined position on the rolled material passes through the first cooling section in the cooling device, and the actual transfer speed when it passes through the second cooling section located downstream of the first cooling section. As well as obtaining the actual passing time of the rolled material for the first cooling section and the second cooling section from these actual transfer speeds,
Based on the actual passage time, predict the passage time of the rolled material downstream from the second cooling section,
A control method for a rolling material cooling apparatus, comprising: controlling a control cooling section located downstream of the second cooling section based on the predicted transit time . After measuring the actual transfer speed of the rolled material in the third cooling section located on the downstream side of the second cooling section and the upstream side of the control cooling section, the actual performance of the rolled material for the third cooling section from the actual transfer speed. Find the transit time,
Correcting the estimated transit time based on the actual transit time in the third cooling section;
6. The method for controlling a rolled material cooling apparatus according to claim 5, wherein the control cooling section is controlled based on the predicted passage time after correction . The method for controlling the rolling material cooling device according to claim 5 or 6 , wherein a temperature fluctuation of the rolled material is calculated from the predicted passage time, and the control cooling section is controlled based on the temperature fluctuation . The said control cooling section is provided with several cooling nozzles, The cooling material flow rate is controlled by making the working number of this cooling nozzle variable, The cooling of the rolling material in any one of Claims 1-7 characterized by the above-mentioned. Control method of the device.

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