JPS6251684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention controls the tension or compression force generated in the material between the rolling mills by controlling the loop amount of the rolled material between the rolling mills in two or more rolling machines. This invention relates to a tension control device.

A conventional device of this type is shown in FIG. In the figure, 1 and 2 are rolling mills, 3 is a rolled material rolled by rolling mills 1 and 2, 4 is a rolling load detection device that detects the rolling load of rolling mill 1, and 5
6 is a rolling torque detection device that detects the rolling torque of the rolling mill 1; and 6 is a rolling torque detection device that detects the rolling torque of the rolling mill 1; 2 is a tension calculation device that calculates the tension or compression force occurring in the material 3 to be rolled between
A tension control device that controls the mill speed of the rolling mills 1 and 2 and the loop amount of the material 3 to be rolled between the rolling mills 1 and 2 so that the tension signal calculated by the tension calculation device 6 matches a predetermined tension signal. , 8 is a mill speed control device that receives an output signal from the tension control device 7 and controls the mill speed of the rolling mill 1 .

Next, the operation will be explained. After the material 3 to be rolled is caught in the rolling mills 1 and 2, the tension calculation device 6 and the tension control device 7 are operated to control the tension or compression force generated in the material 3 to be rolled to a predetermined value.

Since the conventional tension control device is configured as described above, if the material to be rolled 3 buckles due to compressive force or undergoes plastic deformation due to excessive tension, it will cause problems during rolling and prevent the above-mentioned problems. In order to prevent this, there were disadvantages such as unnecessary tension control being not used or the range of tension control being used being narrowed.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and by adding a control limit calculation device and a control limit judgment device to the tension control device, it is possible to expand the range of use of tension control. The purpose of the present invention is to provide a compensating device for tension control that is capable of controlling tension.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 2, reference numeral 9 indicates a rolled material property setting device for setting the plate thickness, plate width buckling stress, yield stress, and cross-sectional shape of the rolled material, and 10 indicates the above-mentioned signals set by the rolled material property setting device 9. 11 is a control limit value signal outputted from the control limit calculation device, and a tension calculation value signal outputted from the tension calculation device 6. This is a control limit determination device that compares and determines the control limit.

Next, the operation will be explained. First, from the rolled material property setting device 9 to the control limit calculation device 10,
Signals of the plate thickness, plate width, buckling stress, yield stress, and cross-sectional shape of the material to be rolled 3 are given, and the limit tension and limit compression force of the material to be rolled 3 are calculated in the control limit calculation device 10.

Next, the material 3 to be rolled is caught in the rolling mills 1 and 2, and the tension calculation device 7 is operated to calculate the tension generated in the material 3 to be rolled. Control limit judgment device 11
compares the tension or compression force signal calculated by the tension calculation device 6 with the limit tension or compression force signal calculated by the control limit calculation device 10, and determines that the calculated tension or compression force signal is the limit tension. If the signal is within a certain range between the and the critical compression force, normal tension control is performed. When the calculated tension or compression force signal approaches the limit tension or compression force signal, tension control is performed, for example, by a certain amount of forced tension correction signal, in order to return the calculated tension or compression force signal to a normal range. Add to device 7. In this case, if the calculated tension approaches the limit tension, the mill speed of the rolling mill 1 is forced by a certain amount (for example, 20 mpm: meter per minute) to reduce the tension occurring in the material 3 to be rolled. If the compression force approaches the critical compression force, the mill speed of the rolling mill 1 is forcibly reduced by a certain amount (for example, 30 mpm) so as to reduce the compression force generated in the material 3 to be rolled. let

Naturally, the tension control device 7 controls the tension or compression force occurring in the rolled material 3 to return it to a normal range, but in normal control, overshoot and damping characteristics (damping ), the control gain of the tension control device 7 is restricted, so even if the calculated tension approaches the limit tension, it is not possible to output an extremely large tension correction signal. However, it is known that adding a separate compulsory correction signal as described above is an effective means. Furthermore, if the calculated tension or compression force signal exceeds the limit tension or limit compression force signal, tension control is not possible, so the control output by the tension control device 7 is held at the current value (Hold). ) and cancel or invalidate further control. Of course, even if the control is stopped, the tension exceeding the limit tension or the compression force exceeding the limit compression force will not disappear, but it is customary to not control when it is impossible to control it, and the rolling operator's judgment Measures are taken such as stopping rolling or restoring the abnormal state through operator operations. It should be noted that the above-mentioned abnormal condition can naturally occur when the control ability of the tension control device 7 is insufficient, but it can also occur in other cases, for example, when the signal detector (sensor) for calculating the tension is out of order. In this case, the calculated tension itself becomes incorrect, so it is clear that it is better to stop tension control based on the incorrect calculated tension.

Also. For example, if the cause is insufficient control capability of the tension control device 7, and if there is another tension control device as described below, you can stop the control with the former tension control device and switch to the latter device. good. For example, if the former device has a small control capacity but good control response or control accuracy, and the latter device has a large control capacity but poor control response or precision, the tension may be lower than normal. If it is within the range, it is best to use the former device, and if it exceeds the normal range, the latter device, which has greater control capability, should be used for control.

In addition, in the above embodiment, the compensation method during execution of tension control was explained, but if the signal of the limit tension or limit compression force is small and it is determined that tension control is impossible, that signal is outputted to the outside in advance. At the same time, a signal to prohibit tension control may be given to the tension control device 7.

Furthermore, in the above embodiment, the loop amount of the material to be rolled 3 between the rolling mills 1 and 2 is controlled by changing the mill speed of the rolling mill 1. Alternatively, the mill speed of rolling mill 2 may be varied, or the mill speed of rolling mill 1 may be changed.
This tension compensator may be applied in a tension control device that changes the mill speed of both the mill speed and the second mill speed.

Furthermore, in the above embodiment, the loop amount of the material to be rolled 3 between the rolling mills 1 and 2 is controlled by changing the mill speed of the rolling mill 1. Alternatively, the rolling reduction of the rolling mill 1 may be changed, or even if applied in a tension control device that changes the rolling reduction of the rolling mill 2 or both rolling mills 1 and 2, the same effect as in the above embodiment can be obtained. play.

In addition, in the above embodiment, the case where there is no other tension control device between the rolling mills 1 and 2 was explained, but if another tension control device is installed, that tension control device and the above-mentioned tension control device are installed. It may be used as a switching/cutting device for switching between the tension control device described in the embodiment or for selecting either one.

As described above, according to the present invention, the conventional tension control device can control the limit tension or limit compressive force of the rolled material according to the plate thickness, plate width, buckling stress, yield stress, cross-sectional shape, etc. of the rolled material. a control limit calculation device that calculates the above-mentioned limit tension or limit compression force signals;
When each signal of the calculated tension or calculated compression force approaches each signal of the above-mentioned limit tension or limit compression force by comparing each signal of the calculated tension or the calculated compression force from the tension calculation device, the tension control device In order to return to normal control, a tension correction or compression correction signal is output, and when the calculated tension or calculated compression force signal exceeds the limit tension or limit compression force signal, the tension control device Since the configuration is additionally equipped with a control limit judgment device that outputs a control stop signal, unnecessary reduction control and speed control are required to correct the tension when the detected tension value of the rolled material approaches the limit value. This prevents plastic deformation of the rolled material. Furthermore, if the detected tension value exceeds the limit value, it is determined that tension control is impossible and the control is stopped, thereby ensuring the safety of the rolling operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structure of a conventional tension control device, and FIG. 2 is a block diagram showing the structure of a tension control device according to an embodiment of the present invention. 1 and 2 are rolling mills, 3 is a material to be rolled, 4 is a rolling load detection device, 5 is a rolling torque detection device, 6 is a tension calculation device, 7 is a tension control device, 8 is a mill speed control device, and 9 is a rolled material A material property setting device, 10 a control limit calculating device, and 11 a control limit determining device.
In addition, in the figures, the same numbers indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A tension calculation device that calculates the tension of the material to be rolled between rolling mills, and receives each signal of calculated tension or calculated compression force from the tension calculation device to calculate the tension of the material to be rolled. In a tension control device that controls the speed or rolling reduction of the rolling mill, the critical tension or A control limit calculation device that calculates the limit compression force compares each signal of the limit tension or limit compression force with each signal of the calculated tension or calculated compression force from the tension calculation device to determine the calculated tension or calculated compression. When each force signal approaches each signal of the above-mentioned limit tension or limit compression force, each signal of tension correction or compression correction is output to the above-mentioned tension control device in order to return to normal control, and the above-mentioned calculated tension or calculated compression signal is outputted to the tension control device. A tension control device comprising: a control limit determination device that outputs a control stop signal to the tension control device when each force signal exceeds the limit tension or compression limit signal. 2. The control signal causes the tension control device to prohibit tension control in advance when the value of the critical tension or critical compressive force of the rolled material is small and the tension controllable range is narrow and the tension control is impossible. The tension control device according to claim 1, wherein the tension control device is a signal.