JP2022055439A - Mill pacing control method - Google Patents

Abstract

To provide a mill pacing control method capable of ensuring entry of a rolled material into a winder in which a failure or the like occurs without extending standby time.SOLUTION: The mill pacing control method comprises: a winding permission/inhibition determination step S1 of determining winding permission/inhibition of a rolled material 19 on the basis of failure information and winding execution information of a plurality of winders 7, and causing the rolled material 19 to stand by on an inlet side of a finishing roller 5 until it is determined that at least one winder 7 can execute winding when there is no winder 7 allowed to execute winding; a winder selection step S3 of selecting a winder 7 to wind the rolled material 19; the standby time calculation step S5 of predicting interference of the winder 7 with a preceding rolled material, calculating winder interference avoidance time and preceding rolled material interference avoidance time, and calculating standby time from both the interference avoidance times; and the entry control step S7 of controlling the timing of entry of the rolled material 19 into the finishing roller 5 on the basis of the standby time.SELECTED DRAWING: Figure 1

Description

The present invention relates to a mill pacing control method in a hot rolling line for rolling a metal material to be rolled (hereinafter referred to as a rolled material) such as a steel material, and in particular, the timing at which the rolled material is entered into a finishing rolling mill. The present invention relates to a mill pacing control method for controlling.

In the hot rolling line 1 showing an example in FIG. 6, the rolled material 19 is heated in the heating furnace 4 (heating step), extracted onto the line, and the steel strip size is measured by the rough rolling mill 3 composed of a plurality of mills. After being roughly prepared (rough rolling step), it is processed into a steel strip having a predetermined size by a finishing rolling mill 5 composed of a plurality of mills (finish rolling step). The rolled steel strip is temperature-adjusted (cooling step), wound by the winder 7 into a coil (winding process), and then carried out of the line.

Normally, in such a hot rolling line 1, since a plurality of rolled materials 19 exist on the line, in order to avoid collisions between the rolled materials 19, the extraction interval from the heating furnace 4 is adjusted. The spacing between the rolled materials 19 is controlled to be appropriate.
Further, since the extraction interval from the heating furnace 4 described above is determined based on the transport prediction of each rolled material 19 at the time of extraction, an error may occur during the transport, and such an error may occur. When a collision between the rolled materials 19 is predicted due to an error, the rolling material 19 that follows is temporarily put on standby at a predetermined point in the middle of the line, and an appropriate distance is provided between the rolled material 19 and the preceding rolled material 19. It is controlled so that it can be rolled.

Further, by controlling the interval between the rolled materials 19 to be the shortest pitch at which the rolled materials 19 do not collide with each other, the rolling efficiency and product productivity in the hot rolling line 1 are improved.
While avoiding such collisions between the rolled materials 19, the extraction interval from the heating furnace 4 is adjusted so that the intervals between the rolled materials 19 are the shortest, and the rolled materials 19 are placed at a predetermined point in the middle of the line. Control that adjusts the interval of the rolled material 19 by making it stand by is called milpacing control.

As a technique related to milpacing control as described above, for example, in Patent Document 1, the rolled material immediately before entering the rough rolling mill is checked for interference with the preceding rolled material, and rough rolling is performed only for the time of interference. An example is disclosed in which the approach time of the machine is corrected and the machine is put on standby in front of the rough rolling mill.
Further, in Patent Document 2, the time required for the finishing rolling process and the winding process of the preceding rolled material and the preparation time required for the preparation on the winding machine side necessary for advancing the rolling material to be carried out to the winding process are described. Is disclosed, an example is disclosed in which the waiting time is calculated based on the predicted time and the waiting time is set in front of the finishing rolling mill.

Japanese Patent Application Laid-Open No. 2003-225702 Japanese Unexamined Patent Publication No. 2013-180324

However, as in Patent Document 1, when the interference with the preceding rolled material 19 is predicted when the predetermined point in front of the rough rolling mill 3 is reached, the finish rolling step and the winding step which are the subsequent steps of the rough rolling step are predicted. It is easy for errors to occur in the prediction regarding.

On the other hand, as in Patent Document 2, when a predetermined point in front of the finishing rolling mill 5 is reached, interference with the preceding rolling material 19 and the preparation time of the winding machine 7 are predicted for finishing rolling. It is possible to accurately predict the process and winding process. However, when an unexpected situation occurs, for example, when a failure occurs on the winder 7 side, the rolled material 19 enters the finishing rolling mill 5 after a predetermined waiting time elapses without detecting this in the prior art. In addition, it may cause equipment trouble because it enters the winder 7 that has failed.

Therefore, conventionally, by extending the waiting time of each rolled material 19 to provide a preliminary waiting time, the timing at which the rolled material 19 enters the finishing rolling mill 5 is delayed by a certain time, and the winding machine 7 suddenly operates. It was possible to deal with any troubles that occurred.
However, as described above, it is preferable that the interval between the rolled materials 19 is the shortest pitch that does not collide with the preceding rolled material 19 from the viewpoint of rolling efficiency, and there is a problem that the improvement of product productivity is hindered by extending the waiting time. rice field.

The present invention has been made to solve such a problem, and is a mill pacing control method for surely preventing the rolled material from entering the winder in which a failure or the like has occurred without extending the waiting time. The purpose is to provide.

(1) In the mill pacing control method according to the present invention, a finish rolling machine that rolls a rolled material extracted from a heating furnace and roughly rolled by a rough rolling machine and the rolled material rolled by the finishing rolling machine are wound. In a hot rolling line having a plurality of take-up machines, the timing at which the rolled material is brought into the finish rolling machine is controlled, and failure information of the plurality of take-up machines and winding are controlled. The winding execution information regarding the execution state is acquired, and based on the acquired information, it is determined whether or not the rolled material can be wound in each winding machine, and if there is no winding machine judged to be capable of winding, at least Until it is determined that one winding machine can be wound, it is determined that the rolled material can be wound in the winding possibility determination step and the winding permission determination step in which the rolled material is made to stand by on the entrance side of the finishing rolling machine. From the winders, a winder selection step for selecting a winder for winding the rolled material, a winder selected in the winder selection step, and a preceding rolled material preceding the rolled material. If it is predicted that there will be interference, the winder interference avoidance time to avoid interference with the winder and the leading rolled material interference avoidance time to avoid interference with the preceding rolled material will be set. An approach control that controls the timing at which the rolled material enters the finishing rolling mill based on the waiting time calculation step for calculating each and calculating the waiting time from both interference avoidance times and the waiting time calculated in the waiting time calculation step. It is characterized by having a step.

(2) Further, in the step described in (1) above, in the winding possibility determination step, in addition to the acquisition information, the plate thickness and plate width range of the rolled material that can be wound by each winding machine. It is characterized in that the rollable range information regarding the rollability is further acquired, and whether or not the rollability is possible is determined based on the acquired rollable range information.

In the present invention, failure information of a plurality of winders and winding execution information regarding the winding execution state are acquired, and based on the acquired information, it is determined whether or not the rolled material can be wound in each winder. If there is no winder that is judged to be windable, the step of determining whether or not to allow the rolled material to stand by on the entry side of the finishing rolling machine until at least one winder is judged to be windable. By providing the above, it is possible to reliably prevent the rolled material from entering the winder in which a failure or the like has occurred.

In addition, by preventing the rolled material from entering the failed winder, it is no longer necessary to provide a preliminary waiting time, which was conventionally provided for dealing with a failure, and the waiting time can be minimized. Therefore, the production efficiency is improved.

It is a flowchart which shows the milpacing control method which concerns on embodiment of this invention. It is a schematic diagram which shows from the rough rolling mill to the winding mill in the hot rolling line which concerns on embodiment of this invention. It is explanatory drawing explaining the winding possible range of the winding machine which concerns on embodiment of this invention. It is explanatory drawing explaining the control example of the milpacing control method which concerns on embodiment of this invention. It is a figure which shows the productivity improvement effect which concerns on embodiment of this invention. It is a figure which shows an example of a hot rolling line to which this invention is applied.

The mill pacing control method according to the embodiment of the present invention controls the timing at which the rolled material enters the finish rolling mill in the hot rolling line.
Prior to explaining the milpacing control method, first, an example of a hot rolling line to which the milpacing control method of the present embodiment is applied will be described with reference to FIG.
FIG. 2 schematically shows only the main configuration of the portion downstream from the rough rolling mill 3 in the hot rolling line 1 according to the present embodiment. In FIG. 2, the same or corresponding parts as those in FIG. 6 are designated by the same reference numerals.

The hot rolling line 1 shown in FIG. 2 includes a heating furnace 4 (see FIG. 6), a rough rolling mill 3 composed of a plurality of mills (only the most downstream mill is shown), and finish rolling composed of a plurality of mills. Machine 5 and 3 winding machines 7 (general winding machines 7a and 7b, winding machines for extra-thick materials 7c) installed separately from the main line, and control for executing mill pacing control. It also has a control unit 9 that performs various arithmetic processes, and a winder control unit 11 that monitors the control and status of the winder 7.
In this example, the points branching from the main lines upstream of the general take-up machines 7a and 7b and the extra-thick material take-up machine 7c are the first point 13, the second point 15, and the third point 17.

When the rolled material 19 is extracted from the heating furnace, the rolled material 19 is conveyed by a transfer device (not shown), the thickness is roughly adjusted by the rough rolling mill 3, and the rolled material 19 is finished and rolled to a predetermined thickness by the finish rolling mill 5. , It is wound into a coil by any of the winders 7. These controls are performed by the control unit 9 and the winder control unit 11 based on the order information 21 indicating the product requirements for each rolled material 19.

The rolled material 19 (hereinafter referred to as coil 23) wound in a coil shape is removed from the winder 7 and carried out of the line. The winder 7 from which the coil 23 has been removed is changed in setting according to the rolled material 19 to be wound next by the winder control unit 11, and when the setting change is completed correctly, the next rolled material 19 is made. Is ready to be rolled up.
The time required for carrying out the coil 23 of the rolled material 19 previously wound and changing the setting according to the rolled material 19 to be wound next is called the preparation time of the winder 7.

Normally, in the hot rolling line 1, while the tip side of the finished rolled material 19 is wound by the winder 7, the finish rolling on the tail end side is performed at the same time (see FIG. 2). It is necessary to allow the rolling material 19 to be followed into the finishing rolling mill 5 in consideration of not only the viewpoint of collision with 19 but also the preparation time of the winding machine 7 described above.

In this regard, as in this example, by providing a plurality of winding machines 7, after the preceding rolled material 19 has been wound by one winding machine 7, another winding is performed without waiting for the coil 23 to be carried out. Since the next rolled material 19 can be wound up by the machine 7, the preparation time can be shortened, which is efficient.

Further, one of the three winders 7 in this example (shown by shading in the figure) is a plate capable of winding with the other two (general winders 7a and 7b). This is a winder 7c dedicated to extra-thick materials having a different thickness range. The difference in the windable range between the general winders 7a and 7b and the extra-thick material winder 7c will be described below with reference to FIG.

FIG. 3 shows the manufacturing range of the steel strip manufactured by the hot rolling line 1 in the present embodiment, and the winding range of the general winders 7a and 7b and the extra-thick material winder 7c. It is a thing.
The manufacturing range is the range of the final steel strip size set when the finish rolling is performed by the finish rolling mill 5. Here, the minimum value of the plate thickness in the manufacturing range is Tmin, the maximum value is Tmax, the minimum value of the plate width is Wmin, and the maximum value is Wmax.

The general winders 7a and 7b can wind the rolled material 19 within the range of the plate width Wmin to Wmax and the plate thickness Tmin to Tb. Further, the extra-thick material winder 7c can wind the rolled material 19 within the range of the plate width Wmin to Wmax and the plate thickness Ta to Tmax.
Therefore, in the manufacturing range of the present embodiment, those having a plate thickness of Tmin to Ta (the range shown by the upward-sloping diagonal line in FIG. 3) can be wound only by the general winders 7a and 7b, and the plate thickness. The ones with Ta to Tb (the range where the upward-sloping diagonal line and the downward-sloping diagonal line in FIG. 3 intersect) can be wound by any of the general winders 7a and 7b and the extra-thick material winder 7c. (The range shown by the downward-sloping diagonal line in FIG. 3) with a plate thickness of Tb to Tmax can be wound only with the extra-thick material winder 7c.
By providing the winders 7 having different windable ranges in this way, the manufacturing range can be broadly covered, but if the rolled material 19 exceeding the windable range accidentally enters the winder 7, if the rolled material 19 accidentally enters the winder 7. It is necessary to keep in mind that it may cause troubles such as equipment failure. The winder control unit 11 has information on the windable range of the general winders 7a and 7b and the extra-thick material winder 7c, and the winder 7 is based on the windable range information. Is in control.

Next, the mill pacing control method applied to the hot rolling line 1 described above will be described.
The mill pacing control method according to the present embodiment adds the finish rolling mill approach control 25 described below to the conventional mill pacing control.
The finish rolling mill entry control 25 controls the timing at which the rolling material 19 before reaching the finish rolling mill 5 is brought into the finish rolling mill 5 by the control unit 9 (see FIG. 2), and is shown in FIG. As described above, the winding possibility determination step S1 for determining whether or not the rolled material 19 can be wound in each winding machine 7, the winding machine selection step S3 for selecting the winding machine 7 for winding the rolled material 19, and the finishing rolling machine. It is provided with a waiting time calculation step S5 for calculating the waiting time of the rolled material 19 on the entry side of the 5, and an approach control step S7 for controlling the timing at which the rolled material 19 enters the finishing rolling mill 5.
Each of the above steps will be specifically described below with reference to FIGS. 1 to 4.
In the following description, the rolled material 19 before reaching the finish rolling mill 5 shown in FIG. 2 is referred to as the material 27, and the pre-rolled material preceding the material 27 is referred to as the predecessor material 29.

<Step to determine whether winding is possible>
In the winding possibility determination step S1, the winding possibility of the material 27 is determined for each winding machine 7 (general winding machines 7a, 7b, extra-thick material dedicated winding machine 7c) based on the state of the winding machine 7. It is a judgment.
When the material 27 reaches the recalculation point 31 (see FIG. 2) provided between the rough rolling mill 3 and the finish rolling mill 5, the control unit 9 detects this and the failure of the winder control unit 11 Information, winding execution information, and winding possible range information are acquired, and it is determined whether or not there is a winding machine 7 capable of winding the material 27 based on the acquired information (step S1-1).

<< Failure information >>
The failure information is information indicating the failure state of each winding machine 7, such as the presence or absence of a failure, and the winding machine control unit 11 constantly monitors the state of the winding machine 7 and acquires the information in real time. ..
In step S1-1, based on the failure information, it is determined that the winder 7 in which the failure has not occurred is "windable" and the winder 7 in which the failure has occurred is "unwindable". When the failed winder 7 is restored and winding becomes possible, the judgment of whether or not winding is possible is changed from "unable to wind" to "possible to wind".

<< Winding execution information >>
The winding execution information is information indicating whether or not winding is being executed, and the winding machine control unit 11 constantly monitors the state of the winding machine 7 and the sensor (not shown) provided at the first point 13. And get information in real time.
In step S1-1, based on the winding execution information, the winder 7 that has not wound the preceding material 29 is "woundable", and the winder 7 that is being wound is "wound". It is judged that it cannot be taken. When the winding machine 7 that has been winding completes winding, the judgment of whether or not winding is possible is changed from "unwindable" to "possible winding".

<< Windable range information >>
The windable range information is information indicating the windable range of each winder 7 described with reference to FIG. 3, and is possessed by the winder control unit 11 as described above.
In step S1-1, based on the windable range information, the plate width and the plate thickness of the material 27 "can wind" the winder 7 within the windable range, and the winding is outside the windable range. It is determined that the taker 7 is "unwindable".

If there is a winder 7 judged to be "windable" in all of the above three viewpoints, the process proceeds to the winder selection step S3. If there is no such winder 7, the material 27 is made to stand by at a standby point 33 (see FIG. 2) provided between the recalculation point 31 and the finish rolling mill 5 (step S1-2).
Further, while the material 27 is kept on standby at the standby point 33, failure information, winding execution information, and winding possible range information are periodically acquired, and step S1-1 is continuously performed to perform the winding machine. When the state of 7 is changed and at least one winder 7 is determined to be "windable" in all of the above-mentioned three viewpoints, the process proceeds to the winder selection step S3.

<Step for selecting a winder>
In the winder selection step S3, one winder 7 for winding the material 27 is selected from the winders 7 determined to be “windable” in the windability determination step S1. ..
When there are a plurality of winders 7 determined to be "windable" in the winding possibility determination step S1, for example, the winders 7 arranged on the upstream side are preferentially selected and set in advance. Select based on the priority.

<Waiting time calculation step>
The standby time calculation step S5 predicts the presence or absence of interference with the preceding material 29 and the winder 7 selected in the winder selection step S3 (step S5-1, step S5-3), and is predicted to have interference. In this case, the preceding material interference avoidance time (step S5-2) for avoiding interference with the preceding material 29 and the winder interference avoiding time (S5-4) for avoiding interference with the winder 7 are calculated, respectively. Then, the waiting time of the material 27 on the entry side of the finishing rolling mill 5 is calculated from both interference avoidance times (step S5-5). The method of calculating the waiting time will be described later with a specific example.

<Entry control step>
The approach control step S7 controls the timing at which the material 27 enters the finish rolling mill 5 based on the standby time calculated in the standby time calculation step S5.
In the approach control step S7, the waiting time calculated in step S5-5 is referred to (step S7-1), and when the waiting time = 0, the material 27 is made to enter the finishing rolling mill 5 (step S7-2). ).
If the waiting time is not 0, the material 27 is made to stand by at the waiting point 33 (step S7-3), and when the waiting time elapses, the material 27 is made to enter the finishing rolling mill 5 (step S7-2). ).

A specific control example of the above-mentioned finish rolling mill approach control 25 will be described by taking the state shown in FIG. 2 as an example. In FIG. 2, the general winder 7a is in the process of winding the preceding material 29, and the general winder 7b is in a state in which a failure has occurred.

When the material 27 reaches the recalculation point 31, the control unit 9 detects this and determines whether or not the material 27 can be wound in each take-up machine 7 by the take-up possibility determination step S1 (step S1-1).
Since the general winder 7a is in the process of winding the preceding material 29, it is determined that "winding is impossible" based on the winding execution information.
Further, since the general winder 7b is in a state where a failure has occurred, it is determined that "winding is impossible" based on the failure information.

Since the extra-thick material winder 7c does not wind the preceding material and no failure has occurred, it is determined whether or not winding is possible based on the windable range information. That is, if the plate thickness of the material 27 is within the range of Tmin <Ta, it is determined that "winding is not possible", and if it is within the range of Ta ≤ Tmax, it is determined that "winding is possible".

When it is determined that the extra-thick material-dedicated winder 7c can be "wound", the extra-thick material-dedicated winder 7c is used as the winder 7 for winding the material 27 by the winder selection step S3. select.

If it is determined that the extra-thick material winder 7c is "unwindable", it is determined that there is no winder 7 capable of winding the material 27, and the material 27 is made to stand by at the standby point 33 (the material 27 is made to stand by at the standby point 33. Step S1-2).
While the material 27 is kept on standby at the standby point 33, the control unit 9 periodically acquires failure information, winding execution information, and winding possible range information, and continuously performs step S1-1.
For example, if the general winder 7a completes the winding of the preceding material 29 (specifically, the sensor described above detects that the tail end of the preceding material 29 has passed the first point 13), the winding is executed. The judgment of whether or not the general winder 7a can be wound based on the information is changed from "unwindable" to "possible to wind". If it is determined that the general take-up machine 7a can be taken up even based on the failure information and the take-up possible range information, the general take-up machine 7a is taken up by the take-up machine selection step S3. Select as the winder 7.

Further, for example, when the general winder 7b recovers from the failure state and is in a state where it can operate normally, the judgment of whether or not the general winder 7b can be wound is determined based on the failure information. If the "possible" is changed to "windable" and the general winder 7b is determined to be "windable" based on the windable range information, the general winder is selected by the winder selection step S3. 7b is selected as the winder 7 for winding the material 27.
In this example, it will be described below assuming that the extra-thick material-dedicated winder 7c is selected in the winder selection step S3.

When the extra-thick material-dedicated winder 7c is selected in the winder selection step S3, the standby time calculation step S5 predicts the presence or absence of interference between the extra-thick material-dedicated winder 7c and the preceding material 29. This point will be described with reference to FIG.
FIG. 4 shows an example of milpacing control of the preceding material 29 and the material 27, and the correlation line L1 reaches each point downstream from the rough rolling mill 3 and the tail end of the preceding material 29 reaches each point. The correlation line L2 shows the correlation between each point downstream from the rough rolling mill 3 and the time when the tip of the material 27 reaches each point.

In the waiting time calculation step S5, when the material 27 enters the finishing rolling mill 5 without waiting at the waiting point 33 based on various conditions such as the finishing rolling speed (see the broken line in the figure), the tip of the material 27 Predicts the time A required to reach the first point 13. Further, based on various conditions such as the finish rolling speed and the take-up speed, the time B required for the tail end of the preceding material 29 to reach the first point 13 is predicted. When the tip of the material 27 is the same as the tail end of the preceding material 29 or reaches the first point 13 before the tail end of the preceding material 29 (A ≦ B), “there is interference with the preceding material 29”. If not (A> B), it is determined that there is no interference with the preceding material 29 (step S5-1).

In the example shown in FIG. 4, since the tip of the material 27 is predicted to reach the first point 13 before the tail end of the preceding material 29, the preceding material interference avoidance time t1 for avoiding interference with the preceding material 29 Is calculated (step S5-2). The preceding material interference avoidance time t1 is obtained by t1 = BA. If it is determined that "there is no interference with the preceding material 29", the preceding material interference avoidance time t1 is not calculated, and the process proceeds to step S5-5.

Further, in the waiting time calculation step S5, when the material 27 enters the finishing rolling mill 5 without waiting at the waiting point 33 (see the broken line in the figure), until the tip of the material 27 reaches the third point 17. Predict the time C required for. Further, the preparation time D of the extra-thick material winder 7c is calculated. As described above, the "preparation time" is the time required to change the setting according to the material 27. In addition, if a coil (not shown) of the rolled material (preceding material) that is wound further ahead of the preceding material 29 remains in the extra-thick material winding machine 7c, it is removed and carried out. Including the time required for rolling.

When the tip of the material 27 reaches the third point 17 at the same time as or earlier than the time when the preparation of the extra-thick material winder 7c is completed (indicated by x in the figure) (C ≦ D). Is judged to have "interference with the winder 7 (winding machine for extra-thick material 7c)", and if not (C> D), "winding machine 7 (winding machine for extra-thick material) 7" It is determined that there is no interference with the machine 7c) (step S5-3).

In the example shown in FIG. 4, the tip of the material 27 is predicted to reach the third point 17 before the time when the preparation of the extra-thick material winder 7c is completed, so that it interferes with the winder 7. The winder interference avoidance time t2 for avoiding the above is calculated (step S5-4). The winder interference avoidance time t2 is obtained by t2 = DC. If it is determined that "there is no interference with the winder 7 (the winder 7c dedicated to the extra-thick material)", the winder interference avoidance time t2 is not calculated, and the process proceeds to step S5-5.

The preceding material interference avoidance time t1 and the winder interference avoidance time t2 are compared, and the larger value is set as the standby time t3 (step 5-5). In the example shown in FIG. 4, t1 <t2, so t3 = t2. When only one of the preceding material interference avoidance time t1 and the winder interference avoidance time t2 is calculated, the calculated value may be set as the standby time t3. If neither the preceding material interference avoidance time t1 nor the winder interference avoidance time t2 is calculated, the standby time t3 = 0.

In calculating the standby time, conventionally, by extending the originally required standby time t3 and providing a spare standby time t4, it is possible to deal with a sudden failure on the winder 7 side. (See correlation line L3). In this regard, in the present embodiment, in the winding possibility determination step S1, the failure information at the time when the material 27 reaches the recalculation point 31 is acquired, and the winding possibility of the winding machine 7 is determined. Therefore, it is not necessary to provide a preliminary standby time t4 for troubleshooting, and the standby time can be minimized.

When the waiting time t3 is calculated in the waiting time calculation step S5, the approach control step S7 causes the material 27 to stand by at the waiting point 33 (step S7-3), and enters the finishing rolling mill 5 after the waiting time t3 has elapsed. (Step S7-2). By making the material 27 stand by, as shown in the correlation line L2 in FIG. 4, when the material 27 reaches the first point 13, the tail end of the preceding material 29 has passed through the first point 13. , The material 27 does not collide with the preceding material 29. Further, when the material 27 reaches the third point 17, the preparation of the extra-thick material dedicated winder 7c is completed, and the material 27 is wound by the extra-thick material dedicated winder 7c.

In this embodiment, the winding possible range information is acquired in step S1-1 to determine whether or not winding is possible. For example, all steel strips within the manufacturing range are all winding machines 7. This judgment is not essential if the winding range is not exceeded.

As described above, in the mill pacing control method of the present embodiment, the winding machine 7 in which the failure has occurred is not selected as the winding machine 7 for winding the material 27, so that the winding machine 7 is wound due to an unexpected situation. Even if a failure occurs in the taker 7, the rolled material 19 (the material 27) does not enter the failed winder, and equipment troubles can be reliably prevented.

Further, since there is no possibility that the rolled material 19 enters the failed winder 7, it is no longer necessary to provide a preliminary waiting time that was conventionally provided for dealing with a failure, and the waiting time is minimized. Because it can be done, it has the effect of improving production efficiency.

In the actual operation, before the introduction of the mill pacing control method of the present invention, the rolled material entered the winder in a state where winding was impossible (failure occurred, out of the winding range, etc.). Whereas equipment troubles caused by the above occurred about once a year, similar equipment troubles did not occur after the introduction.
Furthermore, after the introduction, the effect of improving productivity could be confirmed. Figure 5 shows the results of comparison of productivity before and after the introduction. In FIG. 5, the finishing rolling speed of the preceding material is slow, and the waiting time before the finishing rolling mill is a bottleneck due to the high finishing rolling speed of the material (mainly, the plate thickness is 1.0 mm to 3.5). This is a comparison of the productivity before and after the introduction for those with mm, plate width of 800 mm to 1300 mm, and steel grades of low-rolling and medium-rolling. As shown in FIG. 5, after the introduction of the milpacing control method of the present invention, the production efficiency was improved by about 10% (11.9%) as compared with that before the introduction.

In the present embodiment described above, an example in which three winders are provided is shown, but the number of winders in the present invention may be multiple, and may be two or four or more.

1 Hot rolling line 3 Rough rolling mill 4 Heating furnace 5 Finish rolling mill 7 Winding machine 7a General winding machine 7b General winding machine 7c Extra-thick material winding machine 9 Control unit 11 Winding machine Control unit 13 1st Point 15 2nd point 17 3rd point 19 Rolled material 21 Order information 23 Coil 25 Finishing mill approach control 27 Related material 29 Preceding material 31 Recalculation point 33 Standby point

Claims (2)

A hot rolling line having a finish rolling machine that rolls a rolled material extracted from a heating furnace and roughly rolled by a rough rolling machine, and a plurality of winding machines that wind the rolled material rolled by the finish rolling machine. In the mill pacing control method for controlling the timing at which the rolled material enters the finishing rolling mill.
The failure information of the plurality of winding machines and the winding execution information regarding the winding execution state are acquired, and based on the acquired information, it is determined whether or not the rolled material can be wound in each winding machine, and the winding is performed. If there is no winder that is judged to be possible, the rollability determination step is to make the rolled material stand by on the entry side of the finish rolling mill until at least one winder is judged to be rollable. ,
A winding machine selection step for selecting a winding machine for winding the rolled material from the winding machines determined to be capable of winding in the winding possibility determination step, and a winding machine selection step.
Predicts the presence or absence of interference between the winder selected in the winder selection step and the preceding rolled material preceding the rolled material, and avoids interference with the winder if interference is predicted. Winding machine interference avoidance time, waiting time calculation step to calculate the waiting time from both interference avoiding times by calculating the preceding rolled material interference avoidance time to avoid interference with the preceding rolled material, respectively.
A mill pacing control method comprising: an approach control step for controlling the timing at which the rolled material enters the finishing rolling mill based on the waiting time calculated in the waiting time calculation step. In the winding possibility determination step, in addition to the acquisition information, the winding possible range information regarding the plate thickness and the plate width range of the rolled material that can be wound by each winding machine is further acquired, and the acquired winding is performed. The milpacing control method according to claim 1, wherein the possibility of winding is determined based on the available range information.

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