JPH0448525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a drive control method for continuous rolling equipment.

[Technical background of the invention]

Conventionally, there is a continuous cold rolling facility as shown in FIG. 1. In FIG. 1, reference numeral 1 denotes an unwinding machine that unwinds the coil and draws out the strip. The rewound strip from the unwinding machine 1 is welded at the ends by a welding machine 2 if necessary, and then transferred to a looper entrance bridle roll 3, a looper 4, and a rolling mill entrance (looper exit) bridle roll 5. The rolling mill 6 is guided through the rolling mill 6. The strip after being rolled in the rolling mill 6 reaches a bridle roll 7 at the exit of the rolling mill. Electric motors 1M, 4M, 5 of the unwinding machine 1, the looper 4, the rolling mill entrance bridle roll 5, and the rolling mill exit bridle roll 7
M, 7M are current control devices 1IC, 4IC, 5, respectively.
It is driven by current control by IC and 7IC.

On the other hand, the speed of the electric motor 6M of the rolling mill 6 is controlled by a speed control device 6VC. This speed control device 6VC is operated on the basis of a speed reference signal from a central speed reference circuit 8.

Further, the speed of the electric motor 3M of the looper entrance bridle roll 3 is controlled by a speed control device 3VC. This speed control device 3VC mainly receives an inlet speed reference signal from the inlet speed reference circuit 9 and receives a looper position control signal from the looper position control circuit 10 as a slave, and receives the inlet speed reference signal as necessary. By correcting the looper position control signal, the speed of the looper entrance bridle roll 3 is controlled, and as will be described later, fixed position control of the looper 4 is realized. Further, the speed reference signal from the central speed reference circuit 8 or the signal for the entrance side independent operation is input to the entrance speed reference circuit 9.

In the drive control described above, first, the input side islanding signal is sent via the switching unit IND,
It is input to the inlet speed reference circuit 9. The output of the input side speed reference circuit 9 is input to the speed control device 3VC to control the speed of the electric motor 3M.
The looper entrance bridle roll 3 completes the driving of the looper 4. After that, when the switching part IND is opened and the switching part SYD is closed, the speed reference signal from the central speed reference circuit 8 is given to the entrance speed reference circuit 9, and the looper entrance bridle roll 3
The speed of the rolling mill 6 is controlled in synchronization with the rolling mill 6.

[Problems with background technology]

The drive control of the conventional continuous cold rolling equipment configured as described above has the following problems. That is, even if the rolling mill 6 and the looper entrance bridle roll 3 are controlled to be driven at a constant speed by the speed reference signal from the central speed reference circuit 8, if the rolling reduction amount of the rolling mill 6 changes, the speed at the entrance side of the rolling mill 6 will change. The strip speed changes and the position of the looper 4 changes. As the position of the looper 4 changes, the looper position control circuit 10 outputs a looper position control signal. Then, the speed reference signal from the inlet speed reference circuit 9 is corrected by the looper extraposition control signal. By correcting the speed of the looper entrance bridle roll 3, the position of the looper 4 returns to the control position, completing the looper position control.

The above-mentioned looper position control is repeatedly operated except for a certain reduction amount at which the stripping speed at the entrance side of the looper 4 and the stripping speed at the entrance side of the rolling mill 6 are balanced. Therefore, the position of the looper 4 changes frequently, and in the case of a mechanical looper (loop car system, strand looper system, etc.), such positional changes of the looper cause tension fluctuations in the strip due to mechanical loss, causing tension on the strip at the entrance of the rolling mill 6. By applying tension fluctuations to the strip, distortion occurs in the thickness and other dimensions of the strip after rolling, causing fluctuations and deteriorating the quality of the rolled product.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a drive control method for continuous cold rolling equipment that can minimize tension fluctuations and improve product quality.

[Summary of the invention]

In the drive control method for continuous cold rolling equipment according to the present invention, a looper is provided in front of the rolling mill, and the speed of the input side equipment of the looper is controlled in synchronization with the speed of the rolling mill based on a speed reference signal of the rolling mill. In the drive control method for continuous cold rolling equipment of the above-mentioned method, the input is performed based on the difference between the speed reference signal of the rolling mill or the actual speed detection signal of the rolling mill and the actual speed detection signal of the rolled material at the entrance side of the rolling mill. The above object is achieved by obtaining a speed correction signal of the side equipment and using the speed correction signal to correct the speed reference signal given to the input side equipment.

[Embodiments of the invention]

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

FIG. 2 is a configuration diagram showing a control system in an embodiment of the present invention. In FIG. 2, the same parts as in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. As shown in FIG. 2, a speed detector SS1 is attached to the electric motor 5M of the rolling mill entrance bridle roll 5,
A speed detector SS2 is also attached to the electric motor 6M of the rolling mill 6, and the signals from these speed detectors SS1 and SS2 are input to the speed correction circuit 11.The speed correction circuit 11 calculates the difference between the two signals, and A speed correction signal corresponding to the change in the reduction amount is obtained. This speed correction signal and the speed reference signal from the central speed reference circuit 8 are compared by the comparator COM, the difference is inputted to the inlet speed reference circuit 9, and the output of the inlet speed reference circuit 9 is As in the case of Fig. 1, input the speed control device 3VC and looper entrance bridle roll 3.
to drive and control.

In this way, in response to changes in the rolling reduction amount of the rolling mill 6, the speed of the looper entry side bridle roll 3 is corrected based on the difference between the actual speed signal of the rolling mill 6 and the actual strip speed on the entry side of the rolling mill. As a result, the stripping speed at the entrance of the rolling mill and the stripping speed at the entrance of the looper are exactly the same, and there is no change in the position of the looper, and the quality of the product can be stabilized without fluctuations in the tension of the rolling mill. .

In the above embodiment, the actual speed detection signal of the rolling mill and the actual strip speed detection signal on the entrance side of the rolling mill were used to obtain the speed correction signal, but in recent motor speed control devices, the speed Considering that the error between the standard and the detected speed is extremely small, especially within the negligible error for digital speed control devices, the speed standard is used instead of the actual speed detection signal of the rolling mill as in the above example. Even if signals are used, changes in the position of the looper due to changes in the speed of the rolled material at the entrance of the rolling mill can be suppressed more effectively than in the past, although there may be differences in degree. Since the original purpose of the invention is achieved, there is no problem.

Further, in the above embodiment, the case where the rolling mill has one stand has been described, but it goes without saying that the present invention can also be applied to the case where the rolling mill has a plurality of stands. In this case, considering that the purpose of the present invention is to effectively suppress the change in the position of the looper due to the speed change of the rolled material on the entrance side of the rolling mill, it is necessary to It goes without saying that an actual speed detection signal or an actual strip speed detection signal at the entrance of the rolling mill is used.

〔Effect of the invention〕

As described above, according to the method of the present invention, by suppressing changes in the looper position due to changes in rolling reduction in the rolling mill in continuous cold rolling equipment,
It is possible to suppress tension fluctuations in the strip on the entry side of the rolling mill, making it possible to maintain stable quality of rolled products and stable operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional drive control system of a conventional continuous cold rolling facility, and FIG. 2 is a block diagram showing a control system in an embodiment of the present invention. 1... Rewinding machine, 2... Welding machine, 3... Looper entrance bridle roll, 4... Looper, 5... Rolling mill entrance bridle roll, 6... Rolling mill, 7... Rolling mill exit bridle roll, 1M, 3M, 4M, 5M ,6
M, 7M...Electric motor, 1IC, 4IC, 5IC, 7IC...
Current control device, 3VC, 6VC...Speed control device, 8
...Central speed reference circuit, 9...Inlet speed reference circuit, 1
0... Looper position control circuit, IND, SYD... switching unit, 11... speed correction circuit, SS1, SS2... speed detector, COM... comparator.

Claims (1)

[Scope of Claims] 1. The rolling mill is equipped with at least one rolling mill and is provided with a looper positioned on the front surface of the mill closest to the entrance equipment, the position of which is controlled by a looper position control signal, and which controls the speed of the rolling mill. In a drive control method for continuous rolling equipment, the speed of the input equipment is controlled based on a reference signal and in synchronization with the speed of the rolling mill, the speed for the input equipment corresponding to a change in the rolling reduction amount of the rolling mill. A correction signal is obtained as the difference between the actual speed detection signal of the rolling mill and the actual speed detection signal of the rolled material on the entry side of the rolling mill, and the entry side speed reference signal is determined as the difference between the two. Compare the correction signal with the speed reference signal of the rolling mill, obtain the difference, add the looper position control signal to the input side speed reference signal, and use the resulting signal as the speed reference signal of the input side equipment. A drive control method for continuous rolling equipment, characterized in that: 2. A looper is provided on the front surface of the rolling mill that is equipped with at least one rolling mill and is closest to the entrance equipment, and whose position is controlled by a looper position control signal, A drive control method for continuous rolling equipment in which the speed of the input side equipment is controlled in synchronization with the speed of the rolling mill, wherein a speed correction signal for the input side equipment corresponding to a change in the rolling reduction amount of the rolling mill is controlled by the rolling mill. The speed reference signal of the machine is compared with the actual speed detection signal of the material to be rolled on the entry side of the rolling mill, and the difference is obtained, and the entry side speed reference signal is calculated by comparing the speed correction signal and the speed of the rolling mill. and a reference signal to find the difference, add the looper position control signal to the input side speed reference signal, and give the resulting signal to the input side equipment as the speed reference signal for the input side equipment. A drive control method for continuous rolling equipment, characterized by: