JPH1058032A - Extraction abnormality treatment method in hot rolling winder - Google Patents

Abstract

(57) [Summary] [Problem] To quickly perform an abnormal treatment for a drawing abnormality of a winding device in endless hot rolling. SOLUTION: In endless hot rolling, a predetermined reference cycle time from strip cutting to completion of preparation for winding the next material by a winding device is monitored, and it is detected that preparation for winding the next material is not completed. In such a case, the strip cutting is stopped, the sheet bar is cut at the entry side of the finishing mill, the endless rolling is interrupted, and the trouble is prevented by winding the sheet on the winding device currently wound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating abnormal drawing in a hot rolling winder.

[0002]

2. Description of the Related Art Generally, in an endless hot rolling apparatus, a sheet bar is joined on the entrance side of a finishing mill, and a material to be rolled is continuously supplied to the finishing mill to obtain a strip having a desired product thickness and width. Rolling. The rolled strip travels on a hot run table and is wound into a coil by a winding device via a pinch roll. When the winding to one winding device is completed, the strip is cut by a strip cutting device installed between the finishing mill and the pinch roll, and the wound coil is extracted from the winding device, and the next material is removed. Is wound by another winding device, and is sequentially wound around a coil.

[0003] In such an operation, the winding device is used under extremely severe conditions in terms of impact force and the like, and the rate of occurrence of failures tends to increase. For this reason, conventionally, an operator monitors the operation from the tail end stop of one take-up device to the coil withdrawal and the completion of the preparation for the next material take-up. , Mis-rolling is performed.

[0004]

However, if an abnormality such as a delay in operation occurs only by monitoring by a person, there is a possibility that a measure for detecting the abnormality is delayed. In such a case, the next material invades the winding device that has not yet been prepared for winding, resulting in a mis-coil, causing a trouble that requires a long time for its treatment. Therefore, there is a problem that the rolling yield is reduced, the work efficiency is reduced due to misroll processing and roll change, and the unit consumption of roll grinding is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to quickly detect abnormalities in unwinding of a winding device during endless hot rolling, and to perform the most economical and rapid heat treatment. An object of the present invention is to provide a method for treating a drawing abnormality in a cold rolling take-up device.

[0006]

According to the present invention, the gist of the present invention is shown in FIG.
As shown in the figure, a sheet bar joining device and a sheet bar cutting device are provided on the entrance side of the finishing mill, and two or more winding devices are provided on the exit side of the finishing mill, between the winding device and the finishing mill. In a hot strip mill provided with a strip cutting device, a reference cycle time from strip cutting to completion of preparation for winding the next material of the winding device is determined in advance, the progress of the reference cycle time is monitored, and the reference cycle time is exceeded. When it is detected that the cutting has been performed, the above problem is solved by stopping the cutting of the strip and winding the strip on a winding device that is currently winding.

[0007] The present invention also relates to a method of manufacturing a vehicle, wherein when a portion of the sheet bar joined by the sheet bar joining device is downstream of the sheet bar cutting device, the sheet is detected when the reference cycle time is exceeded. The object has been similarly solved by cutting the bar with the sheet bar cutting device.

According to the present invention, the reference cycle time from the strip cutting to the completion of preparation for winding the next material by the winding device is determined in advance, and the progress of the reference cycle time is monitored.

By dividing the reference cycle time in accordance with each process, it is possible to quickly detect a sampling abnormality and quickly perform an abnormality treatment. This reference cycle time is
For example, it is divided into the following ranges.

(1) Completion of cutting-Completion of stop at tail end fixed position (2) Completion of stop of tail end fixed position-Start of stripper car rise (3) Start of stripper car rise-Stripper car coil touch (4) Stripper car coil touch-Wrapper Roll open (5) Rapper roll open to mandrel reduction limit (6) Mandrel reduction limit to stripper car advance start (7) Stripper car advance start to stripper car wrapper roll interference area off (8) Stripper car wrapper roll interference area off ~
Wrapper roll gap set completed

The time required for each of these steps is monitored, and strip cutting is automatically stopped when the required time exceeds the reference time taking into account the allowance.

[0012] With this, when the unloading abnormality of the winding device is detected, the strip is not wound by the strip cutting device, and the strip is wound on the winding device that is currently winding. As a result, occurrence of misroll can be prevented.

For this reason, even if an abnormality occurs, the rolling is interrupted when the winding of the coil being wound at the time of detecting the abnormality is completed, or after the succeeding material is finish-rolled, the winding is ready for winding. Mistake coil,
Abnormal treatment can now be performed automatically without causing misrolling. As a result, a reduction in rolling yield, a reduction in work efficiency due to a misroll treatment and a roll change, and an avoidance of a basic unit of roll grinding can be achieved.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a configuration diagram schematically showing a hot strip mill according to the present embodiment.

In FIG. 2, the sheet bar 2 is joined by a sheet bar joining apparatus 10 and is rolled by a finishing mill 14. The finishing mill 14 has N stands (for example, N = 7) from the first stand 14a to the N-th stand 14b.
Consists of Further, the sheet bar joining apparatus 10 and the finishing mill 1
4, a sheet bar cutting device 12 is provided.
By installing the sheet bar cutting device between the sheet bar joining device and the finishing mill, the length of the sheet bar to be cut and wound can be reduced. The strip 4 rolled by the finishing mill 14 is wound by the first winding device 20 or the second winding device 21 through the pinch roll 18. A strip cutting device 16 is provided between the pinch roll 18 and the finishing mill 14.

The sheet bar joining device 10, the sheet bar cutting device 12, the strip cutting device 16, and the first and second winding devices 20, 21 have sequencers 22, 24, 26, and 28 for controlling their movements, respectively. Is provided. These sequencers 22, 24, 26, and 28 are connected to each other via a data way 30, and have a configuration in which signals such as flags and status can be shared and recognized.

FIG. 3 is a schematic diagram showing the structure of the first winding device 20 (the same applies to the second winding device 21).

The first winding device 20 includes a mandrel 32 for winding the strip 4 and a wrapper roll 34 for pressing the strip 4 against the mandrel 32 so that the strip 4 can be reliably wound on the mandrel 32. The strip 4 is wound on a mandrel 32 to form a coil 36. The diameter of the mandrel 32 is changed by a mandrel expansion / contraction cylinder 38 in order to facilitate removal of the coil 36 from the mandrel 32.
The change in the diameter of the mandrel 32 is detected by the mandrel contraction sensor 40. At this time, the wrapper roll 34 that has been holding down the coil 36 is also moved in a direction away from the mandrel 32 so that the coil 36 can be easily pulled out. The movement of the wrapper roll 34 is detected by the wrapper roll opening sensor 42.

The coil 36 is taken out from the stripper car 4
4 is performed. Stripper car 44 is coil 3
Immediately below 6, it is raised by a stripper car lift cylinder 48 until it contacts the coil 36. The contact of the stripper car 44 with the coil 36 is detected by the coil touch detection pressure switch 50. When the stripper car 44 contacts the coil 36, the stripper car 44 is moved on the stripper car running rail 56 by the stripper car running motor 54, and the coil 36 is taken out. At this time, the position of the stripper car 44 is detected by a stripper car running pulse generator (PLG) 52.

The sensor signals of the mandrel contraction sensor 40, the wrapper roll limit sensor 42, the coil touch detection pressure switch 50, the stripper car traveling PLG 52, and the like are all taken into the sequencer 28 of the first winding device 20, and in each step. Used to monitor cycle time.

In the present embodiment, the reference cycle time at each step is determined as follows from the experimental results.

(1) Completion of cutting to completion of tail end fixed position stop: 10 seconds + margin 1 second (2) Completion of tail end fixed position stop: start of stripper car rise: 2 seconds + margin 1 second (3) Stripper car rise start-Stripper car coil touch… 5 seconds + margin 1 second (4) Stripper car coil touch-wrapper roll open 2 seconds + margin 1 second (5) Wrapper roll open-mandrel reduction limit… 2 seconds + margin 1 second (6) Mandrel reduction limit-start of stripper car advance ... 2 seconds + margin 1 second (7) Start of stripper car advance-stripper car wrapper roll interference area Off ... 6 seconds + margin 1 Seconds (8) Stripper car wrapper roll interference area off to wrapper roll gap set complete: 2 seconds + 1 second margin

Thus, as a result of determining the reference cycle time in each step, 31 seconds + a total of 8 seconds = 39 seconds, and when 1 second is added to 40 seconds, for example, the last wrapper roll gap If the set is congested, the occurrence of a trouble is detected when about 40 seconds have passed since the completion of cutting.

Hereinafter, the operation of the present embodiment will be described.

In the endless hot rolling, the sheet bar 2 is joined by a sheet bar joining apparatus 10 and is rolled by a finishing mill 14 into a strip 4 having a desired thickness and width. The leading end of the rolled strip 4 is guided by the pinch roll 18 in the direction of the first winding device 20 or the second winding device 21. Further, the leading end of the strip 4 is guided around the mandrel 32 by a wrapper roll 34, and the mandrel 3 is guided by the wrapper roll 34.
2 and is wound on the mandrel 32 in a coil shape.

For example, when the winding on the first winding device 20 is completed, the strip 4 is cut by the strip cutting device 16. At this time, the end of the strip is pinch roll 1
8 and the tension with the first winding device 20 is kept constant. Further, the wrapper roll 34 presses the coil 36 before the cut strip 4 is completely wound on the first winding device 20, and prevents the tail end of the strip 4 from bouncing in the first winding device 20. I do.

When the tail end of the strip 4 is stopped at a fixed position in the first winding device 20 and the winding is completely completed, the stripper car 44 is raised by the stripper car lifting cylinder 48. When the coil touch detection pressure switch 50 detects that the stripper car 44 has come into contact with the coil 36, the wrapper roll 34, which has been pressing the coil 36, moves in a direction away from the mandrel 32. Then, the diameter of the mandrel 32 is changed small by the mandrel expansion / contraction cylinder 38 so that the coil 36 can be easily extracted.

As a result, the wrapper roll 34 and the mandrel 32 are separated from the coil 36, and the coil 36 is supported only by the stripper car 44. When the stripper car 44 advances on the stripper car running rail 56 by the stripper car running motor 54, the coil 36 is taken out of the first winding device 20.
Then, the coil 36 is transferred to a conveyor or the like connected to the next step.

For example, as shown in FIG.
It is assumed that the next rolled strip 4 is wound by the second winding device 21 after being wound by the winding device 20 to form the coil 3 and cutting of the strip is completed. At this time, if the reference cycle time in each step shown above in the first winding device 20 in the flowchart of FIG.

When an abnormality is detected in the first winding device 20, the tail end of the strip 4 being wound and the tip of the next sheet bar 2 are joined as shown in FIG. When the position 30 is on the downstream side of the position of the sheet bar cutting position 12 (corresponding to (A) in FIG. 1), the joining point 3
0 to cancel the strip cutting, and
Does not cut even when it reaches the position of the strip cutting device 12, and continues winding by the second winding device 21.

By stopping the strip cutting,
The strip is cut at the joining point 30 and the next sheet bar 2 is scheduled to be wound up, and the strip is not wound up by the first winding device 20 where the unloading abnormality is detected.

On the other hand, it is preferable to cut the next sheet bar 2 under the sheet bar cutting device 12 by the sheet bar cutting device 12 when an abnormality is detected. This is because if the sheet bar 2 is not cut, the amount of winding by the second winding device 21 increases and exceeds the limit. The trailing material of the cut next material sheet bar 2 is subjected to finish rolling, or after finishing rolling, the second winding device 21 ready for winding,
Or, the first winding device 20 in which the abnormality is eliminated and the winding is ready.
You may make it wind up.

When an abnormality is detected in the first winding device 20, the joining state between the tail end of the strip 4 being wound and the tip of the next sheet bar 2 is determined by the tail end of the strip 4 being wound. When the front end of the next sheet bar 2 is not joined to the end of the next sheet bar 2 (corresponding to (b) in FIG. 1), the tail end of the strip 4 being wound and the end of the next sheet bar 2 are joined. Absent. Since the joining is not performed, the entity does not have the joining point 30,
If there is a joint on the system (apparent), cancel the strip cutting at the joint on the system,
The cutting of the strip at the joining point is stopped. On the other hand, the next material sheet bar 2 is prepared to suspend finish rolling or finish rolling, and thereafter, the second winding device 21 in which the standard of winding is completed or the first winding in which abnormality is eliminated and winding is ready. The take-up device 20 may be used.

Further, when the tail end of the strip 4 being wound and the tip end of the next sheet bar 2 are joined, and the position of the joining point 30 is upstream of the position of the sheet bar cutting device 12. If it is on the side (corresponding to (c) in FIG. 1), after the joining point 30 approaches the sheet bar cutting device 12, the position of the strip 4 side from the joining portion 30 is cut by the sheet bar cutting device 12. Furthermore, after the joint point 30 has passed, cutting is performed on the side of the next sheet bar 2 and the joint point 30 is cut off.
Since the joining point 30 is cut off, the entity does not have the joining point 30. However, if there is a joining point on the system (apparent), the strip cutting is canceled at the joining point on the system, and the joining point is canceled. Stop cutting the strip at. On the other hand, the next material sheet bar 2 interrupts the finish rolling, or finish rolls, and then prepares the second winding device 21 ready for winding, or the first winding device 21 that has cleared the abnormality and is ready for winding.
You may make it wind up on the winding device 20.

When an abnormality is detected in this way, the strip cutting is immediately stopped, and the strip is wound on the winding device during the current pressure winding, so that the abnormal processing can be performed without generating a miscoil or a misroll. Becomes possible.

For example, as described above, if traffic congestion occurs in the wrapper roll gap set in the last step, an abnormality is detected about 40 seconds after the completion of cutting. The portion that has been wound up by the winding device 20 being taken, and if the sheet bar is cut at that time, the sheet bar cutting device 12 and the winding device 20
It has been confirmed that even if the product equivalent length of the entry side of is the longest, it does not exceed the maximum winding diameter of the winding device 20.

FIG. 5 is a graph showing the effect of improving the rolling yield according to the present embodiment. As shown in FIG. 5, the rolling yield is 99.2% according to the present embodiment from 98.5% of the prior art.
%.

FIG. 6 is a graph showing the effect of reducing the decrease in work efficiency according to the present embodiment. As shown in FIG. 6, according to the present embodiment, the work efficiency can be improved so that the work efficiency is reduced by about 0%, whereas the work efficiency is conventionally reduced by 1.0%.

FIG. 7 is a graph showing the effect of reducing the basic unit of roll grinding. As shown in FIG.
According to the present embodiment, it is possible to reduce the per-unit roll deterioration from ton to 0.01 kg / ton or less.

In this embodiment, the sheet bar cutting device is located downstream of the sheet bar joining device. However, the sheet bar cutting device may be located upstream of the sheet bar joining device. In this case, since the joining point is always located on the downstream side of the sheet bar cutting device, FIG.
And (b) only.

[0042]

As described above, according to the present invention,
Even if an error occurs during coil removal, automatic detection can be performed immediately, and strip cutting and sheet bar cutting are automatically performed, so that abnormal treatment can be performed automatically without occurrence of miscoil or misroll. It has become possible. As a result, a reduction in rolling yield, a reduction in work efficiency due to misroll processing and roll change, and an avoidance of a basic unit of roll grinding can be achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the gist of the present invention.

FIG. 2 is a configuration diagram schematically showing a hot strip mill according to the embodiment.

FIG. 3 is a configuration diagram schematically showing a winding device according to the embodiment;

FIG. 4 is a configuration diagram schematically showing a hot strip mill showing the operation of the present embodiment.

FIG. 5 is a graph showing improvement in rolling yield according to the embodiment.

FIG. 6 is a graph showing an improvement in work efficiency according to the embodiment;

FIG. 7 is a graph showing the effect of reducing the basic unit of roll grinding according to the present embodiment.

[Explanation of symbols]

 2 ... Sheet bar 4 ... Strip 10 ... Sheet bar joining device 12 ... Sheet bar cutting device 14 ... Finishing rolling mill 16 ... Strip cutting device 18 ... Pinch roll 20 ... Winding device 22,24,26,28 ... Sequencer 30 ... Data Way 32: Mandrel 34: Wrapper roll 36: Coil 38: Mandrel expansion / contraction cylinder 40: Mandrel contraction sensor 42: Wrapper roll opening sensor 44: Stripper car

Claims (2)

[Claims] 1. A sheet bar joining device and a sheet bar cutting device are provided on the entrance side of a finishing mill, and two or more winding devices are provided on an exit side of the finishing mill. In a hot strip mill provided with a strip cutting device, a reference cycle time from strip cutting to completion of preparation for winding the next material by the winding device is determined in advance, the progress of the reference cycle time is monitored, and the reference cycle time is exceeded. When detecting that the strip has been cut, the strip cutting is stopped, and the strip is wound on a winding device that is currently being wound. 2. The method according to claim 1, wherein when a portion of the sheet bar joined by the sheet bar joining device is downstream of the sheet bar cutting device, when it is detected that the reference cycle time has been exceeded, A method for removing abnormalities in a hot rolling winding device, wherein the sheet bar is cut by the sheet bar cutting device.