JPH0328984B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to rolling equipment that performs stacked crimping rolling of multilayer steel plates, and particularly relates to rolling equipment that performs rolling of multi-layered steel sheets, and in particular, an intermediate steel plate inserted between an upper material and a lower material. The present invention relates to a lap crimping rolling control device that absorbs tension fluctuations caused by elongation of adhesive material (hereinafter referred to as intermediate material).

(Prior Art) Generally, in overlapping crimping rolling, the intermediate material is crushed and slack is produced in the front stage of the crimping stand, so the speed of the intermediate material is controlled in anticipation of this slack. However, if the width or thickness of the rolled material changes, the material of the intermediate material differs, or the temperature changes during compression rolling, tension imbalance will occur, which will adversely affect the quality of the rolled product. There was something that affected me.

FIG. 3 is a block diagram showing the configuration of this type of conventional overlapping and crimping control device together with a rolling system. In the same figure, a top material 1, an intermediate material 2, and a bottom material 3 are each rewound from unwinding machines 4, 5, and 6 each equipped with a drive device capable of tension control, and are rewound by a bridle roll 7, a pinch roll 13, and a bridle roll, respectively. The sheet is passed through a roll 8 to a crimping stand 14 where it is overlapped and crimped rolled, and then passed through a bridle roll 15 to a winding machine 16.
It is designed to be wound up. In this case, between the unwinding machine 5 and the pinch roll 13, there is a pinch roll 9, a bridle roll 10, and a bridle roll 1.
1 and pinch roll 12 are arranged in this order,
The speed of the intermediate material 2 is controlled by a drive device 17 that drives these. Note that bridle rolls, pinch rolls, etc. are also arranged between the unwinding machine 4 and the bridle roll 7, and between the winding machine 6 and the bridle roll 8, but these are omitted as they are not directly related to the present invention. .

Next, in order to control the speed of the intermediate material 2, a speed detector 18 is coupled to the pinch roll 12, while a speed reference calculation circuit 20 calculates a speed reference based on the speed setting value of the speed setting device 19. This speed reference and the speed detection value of the speed detector 18 are compared by the speed control device 21, and an operation signal is applied to the drive device 17 so that the difference between the two becomes zero. Furthermore, in order to correct the speed standard according to the tension of the intermediate material 2, the pinch roll 12 and the pinch roll 13 are
A tension detector 22 is provided between the tension detector 22 and the detected value and the tension reference of the tension setting device 23 are inputted to the tension control device 24. The tension control device 24 outputs a speed reference correction amount corresponding to the deviation between the tension detection value and the tension reference, and also outputs a speed reference correction amount corresponding to the deviation between the tension detection value and the tension reference. The output state is maintained. Note that the speed reference correction amount is added to the speed control system via the tension control upper/lower limit calculation device 25, but at this time, the tension detection value of the tension detector 22 and the tension reference of the tension setting device 23 are also added to the tension control upper/lower limit calculation device 25. added to device 25. Tension control upper and lower limit calculation device 25
calculates the tension control range based on the tension reference, checks whether the detected tension value is within this tension control range, and maintains the correction output in the tension control device 24 while it is within the range. It continues to add signals.

The operation of the overlapping and crimping rolling control device is as follows.
This will be explained with reference to the figures.

First, at the start of crimping rolling, upper material 1 and lower material 3 are
are stacked on top of each other in the crimping stand 14 and passed through at a predetermined low speed.

Next, insert the intermediate material 2 between the upper material 1 and the lower material 3,
If the material is fed at the same low speed, overlapping pressure rolling will start. Then, when it is confirmed that the pressure rolling has been performed reliably, the entire line is accelerated to a predetermined speed, that is, the line speed, and steady rolling begins.

During this time, when the speed of the intermediate material 2 is set by the speed setting device 19, the speed standard calculation circuit 20 calculates the speed standard by also referring to the output of a setting device (not shown) that sets the speed of the entire line. The speed control device 21 generates an operation signal based on this speed reference and the tension detection value of the speed setter 18, and applies it to the drive device 17.

Next, at the stage of transitioning to steady rolling, the tension detector 2
The output of step 2 is input to the tension control device 24 as a feedback signal, and tension control is started from this point. Here, the tension control device 24 is the tension setting device 2
At the same time, the tension reference of the tension setting device 23 and the tension setting value of the tension setting device 22 and the deviation signal are outputted as speed reference correction amounts and added to the tension control upper/lower limit calculation device 25. The tension detection value is also added to the tension control upper and lower limit calculation device 25.
The tension control upper/lower limit calculation device 25 applies the speed standard correction amount as is to the speed control device 21, but on the other hand, it calculates the upper limit of the tension control range that is 30% larger than this and the upper limit of the tension control range that is 30% smaller based on the tension reference. The lower limit is calculated, and while the tension detection value is within this range, a speed correction holding signal is output and applied to the tension control device 24. Therefore, if the tension detection value is outside the tension control range, a deviation signal between the tension reference and the tension detection value is added to the speed control device 21 as a speed reference correction amount, and the tension control upper and lower limit calculation device 25 outputs a correction output. While the holding signal is being applied, the speed reference correction amount at the first point in time when the corrected output holding signal is applied is continuously applied to the speed control device 21.

FIG. 4 is a time chart showing this relationship. That is, as shown in FIG. In addition, in a situation where the tension gradually decreases from an area larger than the tension control range, the deviation signal between the tension reference and the tension detection value is output as is, so this speed reference correction amount gradually increases as shown in c in the same figure. . Then, when the tension detection value falls within the tension control range at time _t1 ,
Since the tension control upper/lower limit calculating device 25 generates the correction output holding signal shown by the broken line C in _FIG . . As a result of continuing such crimping rolling, the detected tension value continues to decrease further and becomes smaller than the lower limit of tension control at time _t2 , the correction output holding signal of the tension control upper/lower limit calculation device 25 disappears, and the tension control device 24 The deviation signal between the tension reference and the detected tension value is output again, and the speed reference correction amount rapidly increases as shown by curve E in FIG. In this way, when the speed reference is set to a large value, when the tension detection value becomes larger than the lower limit of tension control at time _t3 , that is, when it falls within the tension control range, the correction output holding signal is output again and at the same time the speed reference correction amount is is held at its current value.

Thus, pinch roll 12 and pinch roll 1
Pressure rolling can be performed with the tension of the intermediate material 2 between 3 and 3 kept substantially constant.

(Problem to be solved by the invention) In this type of crimping rolling control, it is ideal that the tension detection value is maintained at a position close to the tension reference for a long time, but as mentioned above, the width of the rolled material and When the thickness changes, the material of the intermediate material changes, or the temperature changes during compression rolling, the rolling state changes accordingly. As an example, if the tension detection value is maintained at a value slightly larger than the lower limit of tension control after time _t2 , as shown in curve B in Figure 4a, the corrected output holding signal will be as shown in Figure 4b. The speed reference correction amount is also kept constant as shown by curve F in FIG. This is considered to be good crimping rolling with little tension fluctuation, but after that, even a slight change in tension causes it to fall out of or stay within the tension control range, and the speed standard correction amount is adjusted accordingly. may change frequently. This can be said to be a phenomenon that occurs because the tension standard should have been set smaller, but was erroneously set larger.

However, in the case of conventional lap crimping rolling control equipment, the tension setting is not appropriate and the detected tension value is kept close to the tension control range for a long time, resulting in unstable tension control. The problem was that no countermeasures could be taken.

The present invention has been made to solve the above-mentioned problems, and even if the tension standard is not set properly and the detected tension value remains close to the tension control range for a long time, it can be stabilized. The object of the present invention is to provide a lap crimping rolling control device that can perform tension control.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides pinch rolls and bridle rolls for conveying the intermediate adhesive material, which are provided on the entry side of a crimping stand that overlaps and crimps the top material, intermediate adhesive material, and bottom material. , controlling the speed so that the speed reference of the intermediate adhesive material and the detected speed value match,
In a superposition crimping rolling control device that corrects the speed standard so that the detected tension value of the intermediate adhesive material on the entry side of the crimping stand matches the tension standard,
Outputs the deviation signal between the tension detection value and the tension reference as a speed reference correction amount, and maintains the signal output state at the first time when this output holding signal is applied while an output holding signal is applied from another. a tension control device that calculates the upper and lower limits of the tension control range of the intermediate adhesive material based on the tension reference, and sends an output hold signal to the tension control device when the detected tension value is within the tension control range; and a tension control upper/lower limit calculation device that outputs an upper/lower limit attainment signal when reaching near the upper/lower limits of the tension control range, and a tension control upper/lower limit calculation device that measures the output time of the upper/lower limit attainment signal, When the tension deviation signal exceeds a predetermined value, the upper and lower limits of the tension control range are moved so that the tension deviation signal returns to the center side of the tension control range, and at the same time, the tension is forcibly suppressed for an appropriate period of time. The present invention is characterized by comprising a control upper and lower limit control device.

(Function) In this invention, when the tension detection value reaches near the upper and lower limits of the tension control range, the tension control upper/lower limit calculation device outputs the upper/lower limit reaching signal, and the tension control upper/lower limit control device outputs the upper/lower limit reaching signal. By measuring the output time of this upper and lower limit reaching signal,
When the time exceeds a predetermined value, the upper and lower limits of the tension control range are moved so that the tension deviation signal returns to the center of the tension control range, and at the same time, the output holding signal is forcibly suppressed for an appropriate amount of time. so that
This essentially means that the tension reference has been corrected, and as a result, stable tension control can be performed.

(Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and the same elements as in FIG. 3 are denoted by the same reference numerals and their explanation will be omitted. Here, the tension control upper and lower limit calculation device 25a calculates the upper and lower limits of the tension control range based on the tension reference of the tension setting device 23, and further outputs a correction output during the period when the tension detection value is within this tension control range. In addition to having the same function as the conventional device of outputting a holding signal, narrow tension detection bands are set near the upper limit and near the lower limit of the tension control range, and the tension detection value falls within this tension detection band. It has a function to output a signal when the upper and lower limits are reached. In addition, the tension control upper/lower limit control device 26 newly added to the conventional device measures the output time when the tension control upper/lower limit calculation device 25 outputs the upper/lower limit reaching signal, and calculates the output time. When exceeds a predetermined value,
A function to output upper and lower limit data for parallelly moving the upper and lower limits of the tension control range so that the tension detection value is located at the center of the tension control range, and a correction output output from the tension control upper and lower limit calculation device 25a. It has a function of outputting a tension control force signal that forcibly suppresses the holding signal for an appropriate period of time.

The operation of this embodiment configured as described above will be explained below with particular reference to FIG. 2, focusing on the differences from the conventional device.

First, the tension control device 24 outputs a deviation signal between the tension detection value of the tension detector 22 and the tension reference of the tension setting device 23 as a speed reference correction amount, while the tension control upper/lower limit calculation device 25a outputs the deviation signal between the tension detection value of the tension detector 22 and the tension reference of the tension setting device 23 The upper and lower limits of the tension control range are calculated based on the tension reference of , and a correction output holding signal is applied to the tension control device 24 when the tension detection value of the tension detector 22 is within the tension control range. As a result, the tension control device 24 maintains the signal output state at the first time when the corrected output holding signal was applied.

Further, the tension control upper/lower limit calculating device 25a checks whether the tension detection value, which is within the tension control range, has reached the vicinity of the upper or lower limit. That is, it is checked whether the tension detection zone α set at the upper and lower limits of the tension control range shown in FIG. 2a has been entered. If the tension detection value changes as shown by curve G at this time, at time _t1 when the upper limit is passed, the correction output holding signal shown in b in the figure is output, and the speed reference correction shown in d in the figure is output. The quantities are also kept at their current values. Then, when the tension detection value further decreases and enters the lower limit tension detection zone at time _t2 , the tension control upper and lower limit calculation device 25a
detects this and outputs a lower limit reaching signal. Therefore, the tension control upper and lower limit control device 2
6 measures the output time of this lower limit reaching signal, and at time _t3 , when time T has just elapsed,
A tension control forced signal as shown by the broken line J in FIG. As a result, the speed reference correction amount temporarily increases as shown by curve K in FIG. In addition, at the stage of outputting the tension control forced signal, the tension control upper and lower limit control device 26 outputs upper and lower limit data that horizontally moves the upper and lower limits of tension control by an appropriate value, and adjusts the tension control range to a figure a. Move it downward as shown.
Note that the tension control force signal is reset at time _t4 when the lower limit before the control range is corrected is exceeded. After time _t4 , tension control is performed within the corrected tension control range.

Thus, according to this embodiment, when a control state is reached in which the detected tension value stays near the lower limit of the tension control range for a predetermined period of time or more, the upper and lower limits of tension control are moved and corrected in a smaller direction, and the correction output hold signal is forced. Therefore, even if the tension standard is inappropriately set, stable tension control can be achieved. The above describes a control state in which the tension detection value stays near the lower limit of the tension control range for a predetermined period of time or more. However, if the tension detection value stays near the upper limit of the tension control range for a predetermined time or more, the tension control By moving and correcting the upper and lower limits in a larger direction and forcibly suppressing the corrected output holding signal, the tension control is performed in exactly the same way as described above.

In the above embodiment, the tension control forced signal is reset at the time when the detected tension value deviates from the upper and lower limits before correction. Any of the above appropriate times may be determined.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, when the detected tension value reaches near the upper and lower limits of the tension control range, the upper and lower limits of the tension control range are moved in an appropriate direction. Since it is possible to change the speed reference correction amount at the same time as the parallel movement, it is possible to perform crimping and rolling which is substantially the same as changing the tension reference, thereby making it possible to perform stable tension control.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a time chart for explaining the operation of the same embodiment, and Fig. 3 shows the configuration of a conventional overlapping crimping rolling control device. The block diagram and FIG. 4 are time charts for explaining the operation of this device. 1...Top material, 2...Intermediate adhesive material, 3...Bottom material,
9,12...pinch roll, 10,11...bridle roll, 14...crimping stand, 17...
Drive device, 18...Speed detector, 20...Speed reference calculation circuit, 21...Speed control device, 22...Tension detector, 23...Tension setting device, 24...Tension control device, 25a...Tension Control upper and lower limit calculation device, 2
6...Tension control upper and lower limit control device.

Claims (1)

[Claims] 1. Pinch rolls and bridle rolls for conveying the intermediate adhesive provided on the entry side of the crimping stand for stacking and crimping the top material, intermediate adhesive material, and bottom material are connected to the speed standard and speed detection value of the intermediate adhesive material. In the overlapping crimping rolling control device, the speed is controlled so that the values match, and the speed reference is corrected so that the detected tension value of the intermediate adhesive material on the entry side of the crimping stand matches the tension reference. Tension control that outputs the deviation signal between the value and the tension reference as the speed reference correction amount, and maintains the signal output state at the first time the output holding signal is applied while an output holding signal is applied from another. a device, calculating upper and lower limits of a tension control range of the intermediate adhesive material based on the tension reference, and applying an output holding signal to the tension control device when the detected tension value is within the tension control range; and a tension control upper/lower limit calculation device that outputs an upper/lower limit attainment signal when reaching near the upper/lower limits of the tension control range; upper and lower tension control limits for moving the upper and lower limits of the tension control range so that the tension deviation signal returns to the center side of the tension control range when the tension deviation signal exceeds the range, and at the same time forcibly suppressing the output holding signal for an appropriate period of time; A lap crimping rolling control device characterized by comprising a limit control device.