JPH0671318A - Motion controlling device for rolling shape controlling actuator in rolling mill - Google Patents

Abstract

PURPOSE:To execute good shape correcting by omitting an actuator decided as abnormal by a discriminating means from objects to be controlled to cooperate only between normal actuators. CONSTITUTION:The device is provided with a controlling means 7 by which the controlling amount on shape controlling actuators 3, 4 and 5 such as the actuator 3 for adjusting backup roll crown provided on a rolling mill 2 is operated and inputted. The device is also provided with actual service detecting means 8, 9 and 10 by which the actual service amount of those actuators is detected and a discriminating means 11 by which normal/abnormal operating state of the actuators is decided by comparing the actual service amount detected by the actual service detecting means. The controlling means 7 is constituted so as to omit an actuator decided as abnormal by the discriminating means 11 from objects to be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion control device for a shape control actuator of a rolling mill.

[0002]

2. Description of the Related Art As a technique for controlling the shape of a rolling mill,
For example, those described in JP-A-62-214814 are known. The conventional one is a shape detector which is an assembly of sensors for detecting the plate shape of the rolled material, an appropriate number of shape control actuators for controlling the plate shape, and a rolled material detected by the shape detector. The control means calculates a control amount for controlling the actuator based on the detected shape.

Examples of the shape control actuator include a backup roll crown adjusting motor or hydraulic cylinder, a roll bending hydraulic cylinder, a roll shift motor or hydraulic cylinder, a tilting hydraulic cylinder, a roll coolant cooling liquid supply device, and the like. .

[0004]

In the conventional plate shape control of the rolled material, the control means determines the control amount based on the detected shape and outputs the control amount. It did not manage the actual operation amount). That is, since the conventional one is open loop control, when the shape control actuator has a defect, the control amount output to the defective actuator has no effect on the shape control.

Not only is it ineffective,
If multiple actuators cooperate in shape control, and one of the actuators fails, the shape correction performed by the non-defective actuator may rather disturb the shape. . Therefore, it is an object of the present invention to provide an operation management device for a shape control actuator of a rolling mill, which solves the above problems by detecting a defective actuator.

[0006]

In order to achieve the above object, the present invention takes the following means. That is, the feature of the operation control device of the shape control actuator of the present invention is that the control means for calculating and outputting the control amount to the shape control actuator provided in the rolling mill and the actual operation amount of the actuator. A point is provided with a performance detecting means for detecting, a control means for comparing the control amount by the control means and an actual working amount by the performance detecting means, and a determining means for determining whether the operating state of the actuator is normal or abnormal.

It is preferable that the control means removes the actuator judged to be abnormal by the judging means from the controlled object.

[0008]

According to the present invention, the control means calculates and outputs the control amount to be output to each shape control actuator. Each shape control actuator operates based on the control amount. This operating amount is detected by the performance detection means. The operation amount by the performance detecting means and the control amount by the control means are compared by the determining means. If the difference between the operation amount and the control amount is less than or equal to a predetermined value, it is determined that the operation of the actuator is normal, and vice versa. If the difference is equal to or larger than the predetermined value, the operation of the actuator is determined to be abnormal.

For the actuator judged to be abnormal by the judging means, the control means removes it from the controlled object, so that the shape correction can be carried out in cooperation only among the actuators having no trouble.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, 1 is a rolled material which is a thin plate, and 2 is a multi-stage rolling mill. The multi-stage rolling mill 2 has a pair of upper and lower work rolls, an intermediate roll arranged behind the work rolls, and a backup roll arranged behind the intermediate rolls.

The rolling mill 2 is provided with various shape control actuators. As the shape control actuator, a backup roll crown adjusting actuator 3 including a motor or a hydraulic cylinder, and a roll bending actuator including a hydraulic cylinder.
4 、 Roll coolant actuator consisting of valve
5 etc. are illustrated.

Actuator for adjusting the roll crown
3 is for controlling the pushing amount of the backup rolls divided into a plurality along the plate width direction, and a plurality of them are provided corresponding to the number of the divided rolls. The roll bending actuators 4 are provided at both ends of the intermediate roll and apply a bending force to the roll. The roll coolant actuator 5 controls the amount of coolant supplied to the rolled material 1, and a plurality of roll coolant actuators 5 are provided in the plate width direction.

The plate shape of the rolled material 1 is controlled by organically controlling the shape control actuators 3, 4, and 5. The shape detecting means 6 is provided on the exit side of the rolling mill 2. The shape detecting means 6 detects the shape of the rolled material 1, and is composed of a plurality of shape sensor elements (not shown) arranged along the plate width direction.

The shape detecting means 6 is electrically connected to the control means 7. The control means 7 is also electrically connected to the shape control actuators 3, 4, and 5. The control means 7 is configured to output a predetermined control amount to each of the shape control actuators 3, 4, 5 based on the shape of the rolled material 1 detected by the shape detection means 6.

The rolling mill 2 is provided with performance detecting means for detecting the actual operating amount of each of the shape controlling actuators 3, 4, 5. This achievement detecting means is the control means 7
Each actuator 3,4,5 driven by the control amount from
The actual amount of motion of is detected. Specifically, the position detector 8 is provided for the roll crown adjusting actuator 3, the pressure gauge 9 is provided for the roll bending actuator 4, and the roll coolant actuator 5 is provided.
On the other hand, the flow meter 10 is configured as the above-mentioned result detecting means.

Each of the performance detecting means 8, 9, 10 is provided with a determining means 11
It is connected to the. The discrimination means 11 is the control means 7
A function for judging whether the operating state of the actuators 3, 4, 5 is normal or abnormal by comparing the control amount by the actual detection amount 8, 9, 10 with the actual amount of each actuator 3, 4, 5 Is to have. The determination means 11 is the control means.
Connected to 7. The control means 7 includes the discrimination means 11
The actuators 3, 4, and 5 judged to be abnormal by are excluded from the control targets.

Further, the discriminating means 11 is connected to the notifying means 12, and the notifying means 12 informs the operator of the actuators 3, 4, 5 judged to be abnormal by the discriminating means 11. . An alarm lamp can be used as the notification means 12. The control means 7, the performance detection means 8, 9, 10, the determination means 11 and the like constitute a motion control device for the shape control actuator.

The operation of the operation control device for the shape control actuator will be described with reference to FIG. 2 by taking the roll crown actuator 3 as an example. First, in the control means 7, all of the plurality of roll crown actuators 3 arranged along the plate width direction are set to be normal as initial values. Control starts in this state (
step 1).

Next, based on the assumption of step 1, the control means
In 7, the control amount (Δx _i ) of the shape control actuator 3 is calculated from the shape value from the shape detection means 6 and the target value (step 2). In the control means 7, the control amount determined in step 2 is applied to each actuator. Output to the setter of 3 (step 3).

Operation end timing (end of control cycle)
Then, the actual movement amount (Δr _i ) of each actuator 3 from the start of the control cycle is detected by the actual result detecting means 8 (step 4). Then, the discrimination means 11 makes the following checks (step 5). α <Δr _i / Δx _i <β, where 0 <α <1, 1 <β, that is, the ratio of the actual movement amount Δr _i to the control amount Δx _i is
It is defined as the normal movement rate of the actuator 3, and it is confirmed by the above equation that the normal movement rate is within a certain range around the value 1.

If the above equation is not satisfied, it is judged that the actuator 3 is defective, and the following steps 6 and 7 are performed. That is, in step 6, the actuator 3 is regarded as a defective actuator and excluded from the shape control function of the control means 7. That is, the actuator 3 is excluded from the calculation target in the next control amount calculation.

In step 7, the reporting means 12
Informs the operator of defective actuator 3 by The roll bending actuator 4 is controlled by comparing the difference between the pressure value detected by the pressure gauge 9 and the set pressure after the control cycle, and the roll coolant actuator 5 is controlled. After the cycle, the same processing as described above is performed by comparing the difference between the flow rate detected by the flow meter 10 and the set flow rate.

The present invention is not limited to the above embodiment.

[0024]

According to the present invention, for the actuator judged to be abnormal by the judgment means, the control means removes it from the controlled object, so that the shape correction can be carried out in cooperation only between the actuators having no trouble. Because you can
Good shape correction.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an operation management device for an actuator for shape control according to an embodiment of the present invention.

FIG. 2 is a flow chart showing the operation of the operation management device.

[Explanation of symbols]

 2 Rolling mills 3, 4, 5 Shape control actuators 7 Control means 8, 9, 10 Actual detection means 11 Discrimination means

Claims (2)

[Claims] 1. A control means for calculating and outputting a control amount to a shape control actuator provided in a rolling mill, a performance detecting means for detecting an actual working amount of the actuator, and a control amount by the control means. Comparing the actual work amount by the performance detection means, the normal operation state of the actuator,
An operation management device for an actuator for shape control of a rolling mill, comprising: a determination unit that determines an abnormality. 2. The actuator for shape control of a rolling mill according to claim 1, wherein the control means is configured to exclude an actuator judged to be abnormal by the judgment means from a control target. Operation management device.