KR19980086436A - Method for suppressing exaggeration in cutting system of metal strip - Google Patents

Abstract

In the method of suppressing exaggeration in a cutting system for making a metal strip into a narrow metal band or a product of a predetermined width through a slitter, the metal band 11 having a predetermined width is released from the unwinding roll 12, After the metal band 11 is released, it is cut into a plurality of narrow metal bands 21 through the slitter 22, and the metal bands 21 are wound on the winding rolls 28 without the corresponding plurality of brake mechanisms. The coil 16 is wound and placed in front of the slitter 22 to detect a defect on the metal strip 11 and to quickly stop and remove the defect on the metal strip 11 before reaching the slitter 22. In the cutting system of), an excessive force generated in the metal band 21 according to the sudden stop of the metal strip 11 is supplied to a driving motor (not shown) of the winding roll 28, and Zero together, winding furnace It is characterized by mitigating using a mechanical loss of a drive motor (not shown) of the wool 28.

Description

Method for suppressing exaggeration in cutting system of metal strip

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing exaggeration occurring in a metal band due to a sudden stop of a metal strip in a cutting system of a metal strip, and in particular, to wind each metal band with a plurality of winding rolls without a brake mechanism. The present invention relates to a method for suppressing exaggeration occurring in a metal band at a low cost in a cutting system of a metal strip.

11 shows a cutting system of a conventional metal strip. The cutting system 50 of the metal strip is a system for traversing and winding a metal strip made of copper, copper alloy, and SUS (including tin plating material) at high speed under tension. Slitter for cutting the unwinding roll 52 wound around the metal strip and the metal strip 51 unwound from the unwinding roll 52 into a plurality of narrow metal bands 53 under tension. and a plurality of winding rolls 56 having no slitter 54 and a brake mechanism for traversing the metal band 53.

In front of the slitter 54, defects on the surface of the metal strip 51, for example, scratches or blemishes, are detected and a signal is generated to suddenly stop the metal strip 51 before the defect reaches the slitter 54. Inspector 58 is provided. These defects can be easily removed by a worker, and can be made normal by stopping the metal strip 51 and removing them.

The defect on the metal strip 51 is detected by the inspector 58 and transmitted to the control panel 60 as the detection signal 61. The control panel 60 sends a stop signal 62 to the unwinding roll 52 and the slitter 54 and stops the detected defect at the worker waiting position 64 just before reaching the slitter 54. Stop suddenly.

The plurality of metal strips 53 cut by the slitter 54 are deflected by the separator 66 in the direction of the winding roll 56 for each, so that NO. The winding rolls 56 are wound by traverse winding in positions 1 to 5.

FIG. 13 shows the relationship between time (seconds) and material speed (m / min) when the stop signal 62 is generated from the unwinding roll 52 and the slitter 54 from the control panel 60. The sudden stop is made by drawing the trajectory of ABCD as shown in the figure. A denotes a point where the inspection device 58 detects a defect and starts a rapid deceleration (stop), and AB denotes a sudden deceleration (stop) state (deceleration from 150 m / min to 0 m / min in 2 seconds). In addition, BC has a sudden low speed again at the same slope as AB in the westbound range of the material speed of 5 m / min, and stops at D.

The reason why BC's frost period is provided is that if the material speed is completely stopped at point B in Fig. 13, the material is about 20 mm in length by the material overshoot phenomenon. That is, if this phenomenon occurs in the slitter 54 part (see FIG. 14), the material is cut twice at the time of re-starting, resulting in a burr. Therefore, by advancing the material little by little during the BC frost period, the material is canceled from the back (backward) of the material caused by the overshoot phenomenon of the material to prevent the material from being cut twice.

In such a conventional metal strip cutting system, the distance from the inspection device 58, which is a detection position of a defect, to the worker waiting position 64 is about 4 m, and the slitter (by the control signal by the control panel 60 described above) is used. 54) Always stop at the worker standby position 64 located immediately before.

When the material is suddenly stopped in the above cutting system of the metal strip, the tension applied to the material changes as shown in the trajectory shown in FIG. Fig. 15 shows the winding roll 56 at the NO.1 position shown in Fig. 12, and measures the case of the set winding tension of 5Kg and the speed of 150 m / min.

A sudden stop is applied at point a in FIG. 15, and immediately after that, the tension rises, and the point is brought into an exaggerated state of about 60 Kg at point b, and moves irregularly with the exaggerated state between bc and sags to zero tension at d. Moreover, it is exaggerated again at the point f just before the line stop, moves irregularly between fg and the tension is stabilized after the line stop. The tension of the material in the winding rolls 56 at other positions also draws almost the same trajectory.

On the other hand, in the above-described cutting system of the metal strip, as shown in FIG. 12, the unwinding rolls 52 to the separators 66 are in a straight line, but after the separators 66, the reference of the respective winding rolls 56 is used. The positions are all collinear. Thus, between the separator 66 and each of the winding rolls 56, the material is flanged 68a (separator 66) at two positions of the separator 66 and the tension detecting roll 68, as shown in FIG. Flanges are not shown). As such, when each metal band 53 is fitted to the pass line of each of the winding rolls 56, the material is in contact with the flange of the separator 66 and the tension detection roll 68 (see FIG. 17 (a)). ), If a sudden stop occurs when the plate thickness is thin and the contact to the flange is large, bending of the material edge occurs (see Fig. 17B). In the experiment, bending occurred when a material having a sheet thickness of 0.15 mm was subjected to a tension of about 60 Kg.

Therefore, there is a demand for a method of suppressing exaggeration force in a metal strip cutting system that prevents exerting an exaggeration force of 60 kg or more even when the line is suddenly stopped.

SUMMARY OF THE INVENTION In view of the above-described demands of the prior art, an object of the present invention is to exert an exaggerated force generated in a metal band at low cost in a metal strip cutting system in which each metal band is wound by a plurality of winding rolls without a brake mechanism. It is to provide a method for suppressing an exaggeration force in a cutting system of a metal strip capable of suppressing the problem.

The present invention, which solves the above-mentioned problems, removes a metal strip having a predetermined width from an unwinding roll, and uses a slitter to form a plurality of narrow metal bands, and then each metal band with a plurality of winding rolls without a brake mechanism. In addition, the inspection system is installed in front of the slitter to detect defects on the metal strip, and the cutting system of the metal strip for rapid stopping and removing the metal strip before the defect reaches the placement position of the slitter. The overload force generated in the metal band according to the sudden stop of the metal strip is zeroed at the same time as the occurrence of the sudden stop signal, and the current supplied to the drive motor of the winding roll is reduced by using mechanical loss of the drive motor. Provided is a method for suppressing exaggeration in a metal strip cutting system.

By the mechanical loss of the drive motor, the drive motor has a brake action and tries to stop the winding roll. This reduces the tension on the metal band and avoids an exaggerated state.

The second invention, which is the same industrial field of application as the first invention described above, and has the same purpose, is obtained by unwinding a metal strip of a predetermined width from an unwinding roll, and then using a slitter to form a plurality of small metal bands. In addition to winding each metal band with a plurality of winding rolls without a brake mechanism, a tester is installed in front of the slitter to detect defects on the metal strip, and the metal strip before the defect reaches the position of the slitter. In a cutting system of a metal strip in which a rapid stop and a removal operation are carried out, the exaggeration force generated in the metal band according to the sudden stop of the metal strip is reduced by lengthening the distance from the inspector to the position where the spot where the defect is found stops. A method for suppressing exaggeration force in a cutting system of a metal strip, characterized by reducing the pressure The.

When the initial speed and the final speed are the same, the longer the distance from the inspector to the position where the defect is found stops, the smaller the reduction ratio is, and thus the exaggerated force generated in the metal band due to the sudden stop of the metal strip is alleviated.

The invention according to claim 3, wherein in the method for suppressing the exaggeration force according to claim 1 or 2, when stopping the metal strip suddenly, a slow-running period is given before the complete stop to compensate for the backward of the material due to overshoot. In addition, it is characterized in that the current of the drive motor is returned when the material speed is 25 to 35 m / min before slowing down after the deceleration of the drive motor.

By returning the current of the drive motor from the west side, the winding roll winds the metal band slightly and the tension on the metal band becomes zero to prevent the metal band from sagging. This does not cause a large impact tension that occurs when the metal band is tensioned again in the drooped state.

The invention according to claim 4 is characterized in that, in the method for suppressing the exaggeration force according to claim 3, the sudden stop signal and / or the frost motion signal of the metal strip are continuously controlled so that the speed curve of the material is smooth. .

Since the tension applied to the metal strip is due to the rapid change in the rate of change of the metal strip, the rate of change of the metal strip is made small by continuously controlling the sudden stop signal and / or the synchronous signal so that the speed curve of the material is smooth.

The invention according to claim 5 is characterized in that the slow motion speed is 15 to 30 m / min in the method for suppressing the exaggeration force according to claim 3 or 4.

1 is a schematic diagram schematically showing a cutting system of a metal strip for implementing a method of suppressing an exaggerated tension according to the first invention of the present application.

Figure 2 shows the relationship between the current supplied to the winding roll and the winding torque of the winding roll, (a) is a characteristic of the motor without a mechanical loss, (b) is a start of the motor of the real reality that there is a mechanical loss The characteristic of the time, and (c) has shown the characteristic at the time of winding roll rotation of the real motor in which a mechanical loss exists.

Fig. 3 is a graph showing the relationship between the tension applied to the metal band, the speed of the metal strip and the time when the current supplied to the winding roll is set to zero simultaneously with the generation of the sudden stop signal.

Fig. 4 is a diagram showing a change in tension when continuous control is performed to draw a relaxation curve of 0.5 seconds to the sudden stop signal and / or the synchronous signal of the metal strip.

Fig. 5 is a diagram showing a change in tension in the case where the control is continuously performed to draw a relaxation curve of 1.0 second in the sudden stop signal and / or the synchronous signal of the metal strip.

Fig. 6 is a diagram showing a change in tension when the synchronous speed is 15 m / min.

Fig. 7 is a diagram showing a change in tension when the synchronous speed is set at 20 m / min.

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

Fig. 9 is a diagram showing a change in tension when the reduction ratio between CDs is 10 m / min / second.

10 is a cross-sectional view of a tester for implementing a second embodiment of the method for suppressing an exaggerated tension according to the present invention.

11 is a schematic diagram schematically showing a cutting system of a conventional metal strip.

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

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

FIG. 14: (a) and (b) are schematic diagrams for demonstrating the principle that about 20 mm of material is white by the material overshoot phenomenon.

Fig. 15 is a diagram showing the relationship between the current value supplied to the winding roll during sudden stop in the conventional metal strip cutting system, the speed of the metal strip, and the tension and time applied to the material.

FIG. 16: (a) and (b) is the figure which looked at the cross section along the X-X line of FIG. 12, and its center longitudinal cross-sectional view.

FIG. 17: (a) and (b) are figures for demonstrating the principle which causes a material to bend on a tension detection roll.

Hereinafter, the cutting system of the metal strip according to the present invention will be described in detail according to the preferred embodiment shown.

1 is a schematic diagram schematically showing a cutting system of a metal strip for implementing a method of suppressing an exaggerated tension according to the first invention of the present application.

The cutting system 10 of the illustrated metal strip comprises a coil car 14, an inspector 16, mounted with an unwinding roll 12 wound around a metal strip 11 of a predetermined width, Cutter stand 24 equipped with a dryer 18, a welder 20, and a slitter 22 for cutting the metal strip 11 into a plurality of narrow metal bands 21. And a bobbin car 30 mounted with a separator 26 and a winding roll 28 for winding each metal band 21.

In the coil car 14, a paper winder 13a, a return-workpiece winder 13b, and a snubber roll 13c are disposed adjacent thereto. . Moreover, the cutter stand 24 is provided with the scrap winder 24a which winds up the scrap, and the distribution roll 24b which distributes the some metal band 21 to the separator 26. As shown in FIG. The tension of each metal band 21 is detected by the tension detection roll 27 disposed between the separator 26 and the winding roll 28. When the inspector 16 detects a defect on the metal strip 11, it transmits a detection signal 33 to the control panel 34, which controls the unwinding roll 12 and the slitter ( A continuous control signal 36 is sent to 22 and a control signal 40 is sent to the winding roll 28. The defect on the metal strip 11 is controlled to stop at the worker waiting position 32 by these control signals. The worker identifies the defect at this location and takes the necessary remedial action.

The feature of the method for suppressing the exaggeration force according to the present invention is to make the exaggeration force generated in the metal band according to the sudden stop of the metal strip to zero the current supplied to the drive motor of the winding roll 28 at the same time as the occurrence of the sudden stop signal, It is for relaxation using the mechanical loss of the drive motor 28. Figure 2 shows the relationship between the current supplied to the winding roll 28 and the winding torque of the winding roll 28, (a) is a characteristic of the motor without mechanical loss, (b) mechanical loss is present (C) shows the characteristic at the time of winding roll rotation of the real motor in which a mechanical loss exists. In the motor of the present invention, there is not necessarily a mechanical loss and cannot exhibit the characteristics of the above motor as shown in FIG. The present invention focuses on the mechanical loss of the actual motor shown in Figs. 2B and 2C, and generates a sudden stop signal in a metal strip cutting system having a low-cost winding roll having no brake function. At the same time, the current supplied to the winding roll 28 is zero, and the mechanical loss of the drive motor 28 is used as a brake.

Fig. 3 is a graph showing the relationship between the tension (Kg) applied to the metal band and the speed (m / min) and time (seconds) applied to the metal band when the current supplied to the winding roll is zero at the same time as the occurrence of the sudden stop signal. to be. Compared with the conventional cutting system shown in FIG. 15, the method of the present invention has the advantage that the initial exaggeration immediately after point A, which begins to reduce the speed of the metal strip, is reduced from 60 Kg to 50 Kg without bending. have. Moreover, the late exaggeration force (f point of FIG. 15) of the last stage of the slow-motion period which generate | occur | produced in the conventional cutting system disappeared.

The 2nd invention of this application is characterized by reducing the reduction ratio by making the exaggeration force which generate | occur | produces in a metal band according to the sudden stop of a metal strip long by reducing the distance from the tester to the position where the site | part where a defect was found stops. . Specifically, as shown in Fig. 10, a bypass idle roller 16a is provided in the lower part of the normal pass line inside the inspection machine 16 to form a bypass of about 1500 mm. For this reason, the distance from the inspection machine to the position where the site where the defect is found stops becomes long, so that the reduction ratio from the predetermined speed to the stop becomes small, and the tension applied to the material becomes smaller by that amount.

Moreover, in the above-mentioned 1st invention method, the phenomenon that a metal band sags by the tension becomes zero in the frost period is shown. When the tension is applied again while the metal band sags, it can be seen that a large impact tension is generated (point f in FIG. 15). In a preferred embodiment of the method for suppressing the exaggerated tension according to the present invention, in order to avoid this, the current of the drive motor 28 is returned when the material speed is 25 to 35 m / min before slowing down after the drive motor is decelerated. By returning the current of the drive motor 28 before the frost period, the winding roll 28 slightly winds up the metal band 21, and the tension applied to the metal band 21 becomes zero to prevent the metal band 21 from sagging. .

Further, in another preferred embodiment of the method of suppressing the exaggerated tension according to the present invention, the sudden stop signal and / or the swept signal 36 of the metal strip are continuously controlled so that the speed curve of the material draws a smooth curve. Since the tension applied to the metal strip is caused by the rapid change of the rate of change of the metal strip, the rate of change of the speed of the metal strip can be reduced by continuously controlling the sudden stop signal 36 so that the speed curve of the material is smooth. . Thus, the initial extensibility b point immediately after point A, which starts to decrease the speed of the metal strip, is substantially eliminated. 4 and 5 are diagrams showing a change in tension when continuous control is performed to draw a relaxation curve of 0.5 second and 1.0 second by the sudden stop signal and / or the synchronous signal 36 of the metal strip. In either case, the maximum tension is about 40 Kg, and it is suppressed in the range which a bending does not generate | occur | produce.

In addition, since the tension becomes zero after the frost period and the metal band sag occurs as a reaction of the large tension being abruptly removed, the sinter signal 36 is continuously controlled so that the speed curve of the material is smooth. By gradually releasing the tension, the tension can be avoided to zero. 4 and 5, when the continuous control to draw a 0.5 seconds of relaxation curve is still showing a reaction of the abrupt removal of a large tension, but the continuous control to draw a 1.0 second relaxation curve does not appear. Able to know. That is, in the case of continuous control to draw a relaxation curve of 1.0 second or more, the phenomenon that the tension becomes zero after the frost period and the metal band sag can be avoided. Accordingly, there is an advantage that does not cause a large impact tension that occurs when the metal band is tensioned again in the drooping state.

In still another preferred embodiment of the method for suppressing exaggeration according to the present invention, the slow dynamic speed is 15 to 30 m / min. In the example of FIG. 4, although the frost speed is about 5 m / min, in this case, late exaggeration force (equivalent to f point of FIG. 15) generate | occur | produces in the last stage of a frost motion period. 6 and 7, the synchronous speed is about 45 Kg at 15 m / min and about 30 Kg or less at 20 m / min, and neither is the range where bending occurs in the metal band 21. In FIG. 7, in particular, the control signal 40 for supplying the supply current to the motor of the winding roll 28 together with the sudden stop signal 36 is transmitted. In addition, the rapid stop signal and / or the synchronous signal 36 of the metal strip are continuously controlled so that the speed curve of the material draws a 0.5 second relaxation curve, and furthermore, when the material speed is 30 m / min, the winding roll 28 The current supply was restored.

In another preferred embodiment of the method for suppressing exaggeration according to the present invention, the slow speed is set to 20 m / min, and the reduction ratios between CDs are 20 m / min / sec and 10 m / min / sec. In either case, late exaggeration force (corresponding to f point in FIG. 15) does not occur in the final stage of the west-west period, and the size is 30 Kg or less as in FIG. 7.

Excessive force suppressing method in the metal strip cutting system according to the present invention, the exaggerated force generated in the metal band in response to the sudden stop of the metal strip, the current supplied to the drive motor of the winding roll is zero at the same time as the generation of the sudden stop signal In order to alleviate by using the mechanical loss of a drive motor, it has the advantage that it can carry out simply and inexpensively only by changing the control system with respect to a winding roll.

The method of suppressing the exaggeration force in the cutting system of the metal strip according to the present invention is to exaggerate the exaggeration force generated in the metal band due to the sudden stop of the metal strip and to lengthen the distance from the inspection machine to the position where the site where the defect is found stops. In order to reduce the reduction ratio and to reduce the pressure, for example, a bypass idle roller is provided below the normal pass line to form a bypass of a predetermined length. Have.

Claims (5)

A metal strip of a predetermined width is removed from the unwinding roll, and the slitter is made of a plurality of narrow metal bands, and then each metal band is wound with a plurality of winding rolls without a brake mechanism. A cutting system for metal strips, provided in front of the rotor, to detect defects on the metal strip and to stop and remove the metal strips before the defects reach the position of the slitter. Exaggeration in the stripping system of the metal strip, characterized in that the exaggerated force generated by the current is supplied to the drive motor of the winding roll to zero at the same time as the occurrence of the sudden stop signal, and is relaxed by using a mechanical loss of the drive motor. Force suppression method. After unwinding from the unwinding roll of the metal strip of the predetermined width, the slitter is made of a plurality of narrow metal bands, and then each metal band is wound with a plurality of winding rolls without a brake mechanism. A cutting system for metal strips, provided in front of the rotor, to detect defects on the metal strip and to stop and remove the metal strips before the defects reach the position of the slitter. A method for suppressing exaggeration in a metal strip cutting system, characterized in that the reduction ratio is alleviated by lengthening the distance from the inspector to the position where the defect is found. In the method of suppressing the exaggeration force according to claim 1 or 2, when the metal strip is suddenly stopped, the slow driving period is given before the complete stop to compensate for the backward movement of the material due to the overshoot, and the deceleration of the drive motor is performed. A method of suppressing exaggeration force in a metal strip cutting system, wherein the current of the drive motor is returned when the material speed is 25 to 35 m / min before the slow motion. The method of suppressing the exaggeration force according to claim 3, wherein the sudden stop signal and / or the synchronous signal of the metal strip are continuously controlled so that the speed curve of the material draws a smooth curve. How to suppress the exaggeration. The exaggeration suppression method according to claim 3 or 4, wherein the slow dynamic speed is 10 to 30 m / min.