JPH10328923A - Overtension restraining method in metal strip cutting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overtension restraining method that can restrain overtension generated to metallic bands, at a low cost in a metal strip cutting system for winding the respective metallic bands onto a plurality of winding rolls without brake mechanism. SOLUTION: A metal strip 11 of specified width is wound out of a winding- out roll 12 and made into a plurality of metallic bands 21 of small width by a slitter 22. The respective metallic bands are then wound onto a plurality of winding rolls 28 without brake mechanism. An inspecting machine 16 is provided in front of the slitter 22 so as to detect defects on the metal strip 11, and the metal strip 11 is brought to a sudden stop to perform removable work before these defects reach the arranged position of the slitter 22. In an overtension restraining method in such constitution, overtension generated to the metallic band 21 in association with the sudden stop of the metal strip 11 is relaxed by reducing a current, fed to a driving motor of each winding roll 28, to zero simultaneously with the generation of a sudden stop signal and using mechanical loss of the driving motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing over tension generated in a metal strip due to a sudden stop of a metal strip in a metal strip cutting system, and more particularly to a method for controlling a plurality of windings without a brake mechanism. The present invention relates to a method for inexpensively suppressing over tension generated in a metal strip in a metal strip cutting system in which each metal strip is wound up by a roll.

[0002]

2. Description of the Related Art FIG. 11 shows a conventional metal strip cutting system. The metal strip cutting system 50 includes copper, copper alloy, S
This is a system in which a metal strip such as a US (including a tin-plated material) is slit at a high speed at a high tension and wound in a traverse manner. A slitter 54 that cuts the metal strip 51 that has been put out into a plurality of narrow metal strips 53 under tension.
And a plurality of winding rolls 56 that do not have a brake mechanism for traversely winding the metal band 53.

[0003] In front of the slitter 54, an inspection machine 58 that detects a defect, for example, a scratch or dirt on the surface of the metal strip 51, and issues a signal that causes the metal strip 51 to stop suddenly until the defect reaches the slitter 54. Is provided. Some of these defects can be easily removed by an operator, and a normal product can be obtained by stopping the metal strips 51 and removing them.

A defect on the metal strip 51 is detected by an inspection device 58 and transmitted to a control panel 60 as a detection signal 61. The control panel 60 sends a stop signal 62 to the unwinding roll 52 and the slitter 54 to stop the detected defect immediately at the worker standby position 64 immediately before reaching the slitter 54.

The metal strips 53 cut by the slitter 54 are deflected by separators 66 in the direction of the take-up rolls 56 for the respective strips. At the positions 1 to 5, each winding roll 56 winds up the traverse winding.

FIG. 13 shows the relationship between the time (second) and the material speed (m / min) when the stop signal 62 is issued from the control panel 60 to the unwinding roll 52 and the slitter 54. The sudden stop is performed by drawing the path of ABCD as shown in the figure. A indicates a point at which the inspection machine 58 detects a defect and rapid deceleration (stop) starts, and AB indicates a rapid deceleration (stop) state (deceleration from 150 m / min to 0 m / min in 2 seconds). In addition, BC is a slow moving range of 5 m / min in material speed.
Rapid deceleration occurs again at the same inclination as that of, and stops at D.

Here, the reason for providing the gradual movement period of BC is as follows.
This is because if the material speed is completely stopped at the point B in FIG. 13, the material is backed by about 20 mm in length due to the overshoot phenomenon of the material. That is, the slitter 5
When this phenomenon occurs in the portion 4 (see FIG. 14), the material is cut twice at the time of restart, which causes whiskers to be generated. Therefore, by gradually advancing the material during the gradual movement period of the BC, the material is prevented from being cut twice by offsetting the back (reverse) of the material caused by the overshoot phenomenon of the material.

In such a conventional metal strip cutting system, the distance from the inspection device 58, which is the defect detection position, to the worker standby position 64 is about 4 m, and the control signal from the control panel 60 controls the position immediately before the slitter 54. The operator always stops at the located worker waiting position 64.

[0009]

When the material is suddenly stopped in the above-described metal strip cutting system, the tension applied to the material changes as shown by a locus shown in FIG. FIG.
5 is NO. 5 shown in FIG. One position winding roll 56
And measured at a set winding tension of 5 kg and a speed of 150 m / min.

At a point a in FIG. 15, an abrupt stop is applied. Immediately after that, the tension rises. At a point b, an over-tension state of about 60 kg is applied. I will loosen. Further, the tension is again increased at the point f immediately before the line stops, and the hunting occurs between fg and the tension is stabilized after the line stops. Winding roll 56 at other positions
The material tension at the point also has almost the same trajectory.

In the above-described metal strip cutting system, as shown in FIG. 12, the unwinding roll 52 and the separator 66 are in a straight line, but after the separator 66, the reference positions of the respective winding rolls 56 are different. All are on the same line. Therefore, between the separator 66 and each of the winding rolls 56, as shown in FIG. 16, the material is applied to two edges of the separator 66 and the tension detecting roll 68 with a brim 68a (the brim of the separator 66 is not shown). There must be. As described above, when the metal strips 53 are aligned with the pass lines of the respective winding rolls 56, the material hits the flanges of the separator 66 and the tension detecting roll 68 (see FIG. 17 (a)). If a sudden stop is applied when the contact is large, the material edge is broken (see FIG. 17B). In the experiment, the plate thickness was 0.15mm
When a tension of about 60 Kg was applied to the material No. 5, the material broke.

Therefore, even when the line is suddenly stopped, 60
There has been a demand for a method of suppressing over-tension in a metal strip cutting system that prevents over-tension of not less than Kg.

SUMMARY OF THE INVENTION In view of the above-mentioned demands of the prior art, an object of the present invention is to generate a metal strip at low cost in a metal strip cutting system in which each metal strip is wound by a plurality of winding rolls without a brake mechanism. An object of the present invention is to provide a method for suppressing overtension in a metal strip cutting system capable of suppressing overtension.

[0014]

According to the present invention, a metal strip having a predetermined width is unwound from an unwinding roll and formed into a plurality of narrow metal strips by a slitter. Take up each metal strip with the take-up roll, and install an inspection machine in front of the slitter to detect defects on the metal strip, and stop the metal strip immediately until this defect reaches the slitter placement position In the metal strip cutting system that performs the removal work, the over tension generated in the metal strip due to the sudden stop of the metal strip, the current supplied to the drive motor of the winding roll is generated at the same time as the generation of the sudden stop signal. Provided is a method for suppressing overtension in a metal strip cutting system, which is reduced to zero and uses a mechanical loss of a drive motor to alleviate the tension.

[0015] Due to the mechanical loss of the drive motor, the drive motor has a braking action and attempts to stop the winding roll. Thereby, the tension applied to the metal strip is reduced, and an over-tension state is avoided.

A second invention having the same industrial application field and the same object as the first invention described above is to unwind a metal strip having a predetermined width from an unwinding roll, and use a slitter to form a plurality of small-width metal strips. After forming the band, each metal band is wound up by a plurality of winding rolls without a brake mechanism, and an inspection machine is provided in front of the slitter to detect a defect on the metal strip, and this defect is detected by the slitter. In the metal strip cutting system, where the metal strip is suddenly stopped and the removal work is performed up to the position where the metal strip is located, the inspection machine detects the over tension generated in the metal strip due to the sudden stop of the metal strip. Provided is a method for suppressing over-tension in a metal strip cutting system, characterized in that a reduction ratio is reduced and relaxed by increasing a distance to a position where a cut portion stops.

When the initial speed and the final speed are the same, the reduction ratio becomes smaller as the distance from the inspection machine to the position where the part where the defect is found is stopped becomes shorter. The over tension generated in the band is reduced.

The third aspect of the present invention is the first or second aspect.
In the over-tension suppressing method according to the above, when suddenly stopping the metal strip, a slow-moving period is provided before the complete stop in order to compensate for backward movement of the material due to overshoot, and before the slow-moving after deceleration of the drive motor. The current of the drive motor is restored when the material speed is 25 to 35 m / min.

By returning the current of the drive motor from before the gradual movement, the winding roll slightly winds the metal band, and the tension applied to the metal band becomes zero, thereby preventing the metal band from being loosened. Thereby, a large impact tension which occurs when the tension is applied again while the metal band is loosened is not caused.

According to a fourth aspect of the present invention, in the over-tension suppressing method according to the third aspect, a sudden stop signal of the metal strip and / or
Alternatively, the slow-moving signal is characterized in that sequence control is performed so that the speed curve of the material draws a smooth curve.

Since the tension applied to the metal strip is caused by a sudden change in the rate of change in the speed of the metal strip, the sudden stop signal and / or the slow motion signal are sequence-controlled so that the speed curve of the material draws a smooth curve. This reduces the rate of change in the speed of the metal strip.

The invention according to claim 5 is the invention according to claim 3 or 4.
In the overtension suppressing method according to the above, the gradual movement speed is 15 to 3
0 m / min.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a metal strip cutting system according to the present invention will be described in detail based on the illustrated preferred embodiments.

FIG. 1 is a schematic view showing an outline of a metal strip cutting system for implementing an overtension suppressing method according to the first invention of the present application.

The illustrated metal strip cutting system 10 comprises:
Schematically, a coil car 14 equipped with an unwinding roll 12 on which a metal strip 11 having a predetermined width is wound, an inspection machine 16, a dryer 18, a welding machine 20, and a plurality of small metal strips are formed. A cutter stand 24 on which a slitter 22 for cutting the metal strip 21 is mounted; a separator 26;
And a bobbin car 30 equipped with a take-up roll 28 for taking up.

In the coil car 14, a paper winding machine 13a, a return material winding machine 13b and a snubber roll 13c are arranged adjacent to the coil car 14. In addition, the cutter stand 24 is provided with a scrap winder 24a for winding the scrap and a sorting roll 24b for sorting the plurality of metal bands 21 to the separator 26. The tension of each metal band 21 is detected by a tension detecting roll 27 provided between the separator 26 and the winding roll 28. When the inspection machine 16 detects a defect on the metal strip 11, a detection signal 33 is sent to the control panel 34.
The control panel 34 sends the sequence control signal 3 to the unwinding roll 12 and the slitter 22 by a method described later.
6 and a control signal 40 to the take-up roll 28. Defects on the metal strip 11 are controlled by these control signals to stop at the worker standby position 32. The worker checks the defect at this position and takes necessary recovery measures.

The feature of the overtension suppressing method according to the present invention is that the overtension generated in the metal strip due to the sudden stop of the metal strip is controlled by the current supplied to the drive motor of the winding roll 28 at the same time as the generation of the sudden stop signal. It is set to be zero, and is alleviated by utilizing the mechanical loss of the drive motor 28. FIG. 2 shows a winding roll 2
8 shows the relationship between the current supplied to the motor 8 and the winding torque of the winding roll 28, wherein (a) shows the characteristics of an ideal motor having no mechanical loss, and (b) shows the characteristics of an actual motor having mechanical loss. Starting characteristics, and
(C) shows the actual characteristics of the motor at the time of rotation of the take-up roll where the mechanical loss exists. The real motor is
There is always a mechanical loss, and the characteristics of an ideal motor as shown in FIG. 2A cannot be exhibited. The present invention is shown in FIG.
Focusing on the mechanical loss of the actual motor shown in (b) and (c), in a metal strip cutting system having an inexpensive winding roll without a braking function, winding is performed simultaneously with generation of a sudden stop signal. The current supplied to the roll 28 is set to zero, and the mechanical loss of the drive motor 28 is used as a brake.

FIG. 3 shows the tension (Kg) applied to the metal band and the speed (m / min) and time (second) of the metal strip when the current supplied to the winding roll is set to zero at the same time as the generation of the sudden stop signal.
FIG. When compared to that in the conventional cutting system shown in FIG.
There is an advantage that the initial over tension immediately after the point A at which the speed of the metal strip starts to be reduced is reduced from 60 kg to 50 kg at which no break occurs. In addition, the late overtension in the final stage of the gradual movement period generated in the conventional cutting system (f in FIG. 15).
Point) is also gone.

According to the second invention of the present application, the over-tension generated in the metal strip due to the sudden stop of the metal strip is reduced by increasing the distance from the inspection machine to the position where the part where the defect is found is stopped. It is characterized by reducing the size and relaxing. Specifically, as shown in FIG. 10, a bypass idle roller 16a is provided below the normal pass line inside the inspection machine 16 to form a bypass of about 1500 mm. As a result, the distance from the inspection machine to the position where the location where the defect is found stops is increased, and therefore, the reduction ratio from the predetermined speed to the stop is reduced, and the tension applied to the material is reduced accordingly.

In the method of the first invention described above, a phenomenon occurs in which the tension becomes zero during the gradual movement period and the metal band is loosened. It is known that when a tension is applied again while the metal band is loose, a large impact tension is generated (point f in FIG. 15). In a preferred embodiment of the overtension suppressing method according to the present invention, in order to avoid this, the drive motor 2 is driven at a material speed of 25 to 35 m / min before deceleration after the drive motor is decelerated.
8 is restored. By returning the current of the drive motor 28 before the gradual movement period, the winding roll 28 slightly winds up the metal band 21, and prevents the tension applied to the metal band 21 from becoming zero and the metal band 21 from being loosened. .

Further, in another preferred embodiment of the overtension suppressing method according to the present invention, the sudden stop signal and / or the slow movement signal 36 of the metal strip are sequence-controlled so that the speed curve of the material draws a smooth curve. I do. Since the tension applied to the metal strip is caused by a sudden change in the rate of change in the speed of the metal strip, the sudden stop signal 36 is sequence-controlled so that the speed curve of the material draws a smooth curve. The rate can be reduced. As a result, the initial over tension point b immediately after the point A at which the speed of the metal strip starts to decrease is substantially eliminated. FIGS. 4 and 5 are diagrams showing the change in tension when the sequence control is performed on the metal strip sudden stop signal and / or the slow motion signal 36 so as to draw a 0.5-second and 1.0-second relaxation curve. It is. In each case, the maximum tension is about 40 Kg, which is a range in which no break occurs.

Further, since the phenomenon that the tension becomes zero and the metal band becomes loose after the gradual movement period occurs as a reaction to the sudden removal of a large tension, the gradual movement signal 36 is used as the speed curve of the material. If the tension is gradually released by performing sequence control so as to draw a simple curve, it is possible to prevent the tension from becoming zero. From FIGS. 4 and 5, when the sequence control is performed so as to draw a relaxation curve of 0.5 seconds, there is still a reaction that a large tension is suddenly removed, but the relaxation of 1.0 second is performed. When the sequence is controlled so as to draw a curve, it can be seen that it does not appear. That is, when the sequence control is performed so as to draw a relaxation curve of 1.0 second or more, the phenomenon that the tension becomes zero after the gradual movement period and the metal band is loosened can be avoided.
Thereby, there is an advantage that large impact tension which occurs when tension is applied again in a state where the metal band is loosened is not caused.

In still another preferred embodiment of the overtension suppressing method according to the present invention, the slowing speed is 15 to 30 m / min. In the embodiment of FIG. 4, the gradual movement speed is about 5 m / min. In this case, late overtension (corresponding to the point f in FIG. 15) occurs at the final stage of the gradual movement period. Referring to FIG. 6 and FIG. 7, the gradual movement speed is about 45 kg at 15 m / min and about 30 kg or less at 20 m / min, and both are within the range where the metal band 21 does not break. In FIG. 7, in particular, a control signal 40 for setting the supply current to the motor of the winding roll 28 to zero is transmitted together with the sudden stop signal 36. Also, the metal strip sudden stop signal and / or the slow motion signal 36 are sequence-controlled so that the speed curve of the material draws a relaxation curve of 0.5 seconds. Further, when the speed of the material is 30 m / min. Then, the current supply to the winding roll 28 was restored.

In still another preferred embodiment of the overtension suppressing method according to the present invention, the slowing speed is set to 20 m / min, and the reduction ratio between CDs is set to 20 m / min / sec and 10 m / min / min.
Seconds. In any case, late over tension (corresponding to the point f in FIG. 15) does not occur at the final stage of the gradual movement period,
As in FIG. 7, the size is 30 kg or less.

[0035]

According to the present invention, there is provided a method for suppressing overtension in a metal strip cutting system, comprising the steps of suddenly stopping an electric current supplied to a drive motor of a take-up roll due to an overtension generated in a metal strip due to a sudden stop of a metal strip. It is set to zero at the same time as the generation of the signal, and is mitigated by using the mechanical loss of the drive motor,
There is an advantage that the present invention can be implemented simply and inexpensively simply by changing the control system for the winding roll.

In the method for suppressing over tension in the metal strip cutting system according to the present invention, the over tension generated in the metal strip due to the sudden stop of the metal strip is reduced to a position where a portion where a defect is found from an inspection machine stops. Since the reduction ratio is reduced and relaxed by increasing the distance, for example, simply providing a detour idle roller below a normal pass line to form a detour of a predetermined length is simple and easy. It has the advantage that it can be implemented at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an outline of a metal strip cutting system for performing an overtension suppressing method according to a first invention of the present application.

FIG. 2 shows the relationship between the current supplied to the winding roll and the winding torque of the winding roll. FIG. 2 (a) shows the characteristics of an ideal motor having no mechanical loss, and FIG. (C) shows the characteristic of the existing real motor at the start of the motor, and (c) shows the characteristic of the real motor having the mechanical loss when the take-up roll rotates.

FIG. 3 is a diagram showing the relationship between the tension applied to a metal band, the speed of a metal strip, and time when the current supplied to the take-up roll is set to zero simultaneously with the generation of the sudden stop signal.

FIG. 4 shows a sudden stop signal and / or a slow motion signal of a metal strip,
FIG. 9 is a diagram illustrating a change in tension when sequence control is performed so as to draw a 0.5 second relaxation curve.

FIG. 5 shows a sudden stop signal and / or a slow motion signal of a metal strip;
FIG. 9 is a diagram illustrating a change in tension when sequence control is performed so as to draw a 1.0 second relaxation curve.

FIG. 6 is a diagram showing a change in tension when the gradual movement speed is set to 15 m / min.

FIG. 7 is a diagram showing a change in tension when the gradual movement speed is set to 20 m / min.

FIG. 8 is a diagram showing a change in tension when a reduction ratio between CDs is set to 20 m / min / sec.

FIG. 9 is a diagram showing a change in tension when a reduction ratio between CDs is set to 10 m / min / sec.

FIG. 10 is a cross-sectional view of an inspection machine that implements a second embodiment of the overtension suppressing method according to the present invention.

FIG. 11 is a schematic view showing an outline of a conventional metal strip cutting system.

FIG. 12 is a schematic plan view of the metal strip cutting system of FIG. 11;

FIG. 13 is a diagram showing the relationship between the speed and time of a metal strip at the time of a sudden stop in a conventional metal strip cutting system.

FIGS. 14A and 14B are schematic diagrams for explaining the principle that the material is backed by about 20 mm in length due to the overshoot phenomenon of the material.

FIG. 15 is a diagram showing a relationship between a current value supplied to a take-up roll, a speed of a metal strip, a tension applied to a material, and time in a conventional metal strip cutting system at the time of sudden stop.

16 (a) and (b) are a view taken along the line XX of FIG. 12 and a longitudinal sectional view at the center thereof.

FIGS. 17A and 17B are diagrams for explaining the principle of causing a material to break on a tension detection roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cutting system 11 Metal strip 12 Unwinding roll 16 Inspection machine 18 Dryer 20 Welding machine 21 Metal strip 22 Slitter 24 Cutter stand 26 Separator 27 Tension detection roller 28 Winding roll 32 Worker standby position 34 Control panel 36 Emergency stop signal and / Or slow motion signal 40 control signal

Claims (5)

[Claims] 1. A metal strip having a predetermined width is unwound from an unwinding roll, formed into a plurality of small-width metal strips by a slitter, and then wound up by a plurality of winding rolls without a brake mechanism. In addition, an inspection machine is installed in front of the slitter to detect a defect on the metal strip, and this defect causes the metal strip to stop suddenly before reaching the position where the slitter is located, and to perform the removal work of the metal strip. In the system, the over tension generated in the metal strip due to the sudden stop of the metal strip is reduced to zero at the same time as the sudden stop signal of the current supplied to the drive motor of the take-up roll, and the mechanical loss of the drive motor is used to mitigate the over tension. A method for suppressing over-tension in a metal strip cutting system. 2. A method in which a metal strip having a predetermined width is unwound from an unwinding roll and formed into a plurality of small-width metal strips by a slitter, and then each metal strip is wound up by a plurality of winding rolls having no brake mechanism. In addition, an inspection machine is installed in front of the slitter to detect a defect on the metal strip, and this defect causes the metal strip to stop suddenly before reaching the position where the slitter is located, and to perform the removal work of the metal strip. In the system, it is necessary to reduce the reduction ratio by reducing the over-tension generated in the metal strip due to the sudden stop of the metal strip by increasing the distance from the inspection machine to the position where the part where the defect is found is stopped. A method of suppressing over tension in a metal strip cutting system, which is a feature of the present invention. 3. The over-tension suppressing method according to claim 1, wherein when the metal strip is suddenly stopped, a low-speed slow-moving period is provided before the complete stop to compensate for backward movement of the material due to overshoot. A method for suppressing over-tension in a metal strip cutting system, wherein the current of the drive motor is restored at a material speed of 25 to 35 m / min before deceleration after deceleration of the drive motor. 4. The over-tension suppressing method according to claim 3, wherein the sudden stop signal and / or the slow movement signal of the metal strip are sequence-controlled so that the speed curve of the material draws a smooth curve. A method of suppressing over tension in a metal strip cutting system, which is a feature of the present invention. 5. The method for suppressing over-tension according to claim 3, wherein the slowing speed is 10 to 30 m / min.