JPH0327809A - Shape control method for rolled stock - Google Patents

Abstract

PURPOSE:To execute the shape control with high precision by utilizing an existing rolling mill by correcting a rolling reduction position and maintaining an actual result value within a limited range, when the actual result value of a work roll bender which is controlled, based on a detection value of a shape detector exceeds the limited range. CONSTITUTION:A shape detection value of a rolled stock 7 detected by a shape detector 4 is inputted to a shape mode analyzing processing part 9, and an actual result value of a shape mode coefficient is calculated. Subsequently, the actual result value is compared with a target value of the shape mode coefficient in a comparing part 9A, its difference is outputted to a symmetrical mode controller 10, and a manipulated variable of a bender is calculated. Next, the manipulated variable of the bender is outputted to a bender control system 11, and based on a control command, being force in the bender 1 is controlled. Simultaneously, the bender control system 11 calculates an actual result value of the bender, outputs it to a range-over processing part 12 and judges whether it exceeds a prescribed limited range or not, and in the case of exceeding, a change command of a rolling reduction position is outputted to a rolling reduction position control system 13 and a rolling reduction device 6 is operated, and the rolling reduction position is adjusted.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for controlling the shape of rolled material using a rolling mill.

[Conventional technology]

In recent years, high shape accuracy has been required when rolling thin plates using rolling mills, and automatic shape control technology has been introduced to meet this demand. Specifically, for example, a method is adopted in which the work roll bender and rolling position of the rolling mill are operated using a predetermined control logic based on the detected value detected by a shape detector placed on the exit side of the rolling mill. There is. In this case, shape defects that are symmetrical in the width direction of the rolled material, such as edge elongation, are dealt with by a work roll bender, and asymmetrical defects are brought to the rolling position using the work roll driving gauge and driven circle. They responded by creating a difference.

[Problem to be solved by the invention]

However, when shape control is performed using such a control method, the work roll bender must be operated over a fairly wide range in order to obtain sufficient shape accuracy in response to changes in the strip width and steel type of the target rolled material. There was a problem in that complicated equipment was required, such as a six-high rolling mill with an intermediate roll shift mechanism and a rolling mill with a variable crown allfg of the backup roll. That is, even if these rolling ATs, for example, were attempted to be manufactured by modifying an existing rolling mill, there was a problem in that the cost required for the modification would be too high. The present invention has been made to solve the above-mentioned problems, and provides a method for controlling the shape of a rolled sheet material by using an existing rolling mill as is, at a low cost, and by which the shape of the rolled sheet material can be controlled with high precision. The purpose is to

[Means to solve the problem]

The present invention provides a method for controlling the shape of a rolled material based on a detected value by a shape detector, including a procedure for operating a work roll bender of a rolling mill based on the detected value; The above objective is achieved by including a step of correcting the rolling position when the actual value of the work roll vendor exceeds a predetermined limit range, and maintaining the actual value of the work roll vendor within the above limit range. be.

[Effect]

In the present invention, if the pender actual value, which is controlled based on the detected value of the shape detector installed in the rolling mill, exceeds a predetermined limit range, even if it is a symmetrical shape defect, Therefore, even in cases where only the work roll bender is used, the roll rolling position is actively corrected to maintain the actual value of the bender control within the limit range. As a result, it becomes possible to always maintain the pending force within an appropriate range, and it becomes possible to control the shape of the rolled material with high precision without the need for complex and large-scale equipment.

【Example】

Hereinafter, embodiments of the method for controlling the shape of a rolled material according to the present invention will be described in detail with reference to the drawings. Fig. 1 is a block diagram schematically showing an example of a control system of a rolling mill applied to this embodiment, and Fig. 2 is an explanatory diagram showing the effects of this embodiment in comparison with a conventional case. The rolling mill applied to the embodiment is a work roll bender 1.
This is a four-high rolling mill equipped with a pair of work rolls 2 and backup rolls 3 adjacent to the work rolls 2, and a load cell 5 for detecting the rolling load is installed above the upper back-up roll. , the load cell 5
A rolling down device is installed above each. A shape detector 4 is disposed at the output of the rolling mill, and the shape detector 4 is capable of detecting the shape of the rolled material 7 that has been rolled by the pair of work rolls 2. ．． Further, 8 in the figure indicates a coil around which the rolled material 7 is wound. In the method of this embodiment, when the bender performance value obtained from the detected value by the shape detector 4 exceeds a predetermined limit range, the rolling down device 6 is operated to correct the rolling position, and the bender performance value is The rolling process is performed by operating the bender 1 while controlling the temperature to return to within the above-mentioned limit range. That is, the shape detection value of the rolled plate material 7 detected by the shape detector 4 is input as an electrical signal to the shape mode decomposition processing section 9, where the actual value of the shape mode coefficient is calculated. The result of the calculated shape mode coefficient above! The value is the comparison part 9A
, and the comparison unit compares it with a target value of the shape mode coefficient that has been input in advance. The difference between the actual value and the target value of the shape mode coefficient is determined by the symmetrical mode controller 1.
0, and the controller 10 calculates the vendor operation amount based on the difference between the target value and the actual value of the shape mode coefficient. The calculated bender operation amount is sent from the shape mode controller 10 to the bender control system 11 as a bender control command.
, and the vendor control system 11 sends the vendor 1 . Controls the pending force at . At the same time, the vendor control system 11 calculates the vendor performance value, and outputs the performance value to the range over processing section 12, where it is determined whether or not it exceeds a predetermined limit range. This limited range may be, for example, the bender's movable range, or the range obtained by excluding the bender's operation amount within the coil from the bender's movable range. Above range. If the over-processing unit 12 determines that the bender actual value exceeds the predetermined limit range, the bending position change command is issued from the processing unit 12 so that the bender actual value returns to within the above-mentioned limit range. Position control system 1
3, the lowering device 6 operates based on the change command, and the lowering position is adjusted. At this time, the load generated due to the operation of the lowering device 6 is detected by the load cell 5, and the detection signal is sent to the range over processing section 12.
It is now entered into . According to the method for controlling rolled plate material of the present embodiment described in detail above,
Even if the amount of operation of the bender changes significantly due to hardness fluctuations in the coil of the rolled material 1, plate thickness fluctuations, or speed changes of the rolling mill, the actual value of the bender can always be kept at the predetermined level by manipulating the rolling position. Since it can be maintained within a limited range, a predetermined shape can be obtained with high precision without requiring large-scale equipment for controlling roll pending. This improves the operability of post-processes, increases productivity, and improves product quality, among other excellent effects. Next, the effects of automatic shape control using the method of this example will be specifically shown based on actual measurement data. In Figure 2, the upper row shows the relationship between the actual d value (solid line) and the target value (dashed line) of the shape mode coefficient value A2, the middle row shows the actual measured value of the bending position, and the lower row shows the actual measured value at the rolling position. are shown as measurement charts for the same time period, and the left side of the figure with the dashed line as a boundary is the measurement result when using the conventional method, and the right side is the measurement result when using the method of the present invention. Note that the above shape mode coefficient A2 is a shape mode coefficient when the elongation rate of each divided portion detected by the shape detector 4 is expanded into an orthonormal function, and A2>0 indicates the edge elongation, and A2<0. O represents abdominal expansion. As is clear from Fig. 2, in the conventional method, even when the vendor's actual value was about to exceed the operating range, interlocking i$IJ control was not performed particularly for the rolling position.
The deviation of the shape mode coefficient A2 (target value - actual 1) increased due to the restriction of the bender's operation. In order to solve this problem, vendors have traditionally introduced complex and large-scale equipment in order to expand their operating range. In contrast, in the method of this embodiment, when a similar situation occurs, the rolling position changes accordingly, and the deviation of the mode coefficient A2 increases while the bender operation is maintained within the limited range. It prevents In this way, in this example, the actual e[ of the shape mode coefficient A2 is almost equal to the target value, and it is recognized that stable shape control is achieved without expanding the bender's operating range. ．． In addition, when operating the rolling position as mentioned above, the rolling force changes depending on the operation. Therefore, for example, in tandem rolling IR where dull rolls are used as the work rolls of the final stand, it is necessary to keep the surface roughness of the rolled material within a predetermined range. It may be necessary to interrupt the operation to change the position of the roll. As mentioned above, the present invention has been specifically explained based on the examples, but the present invention is not limited to what is shown in the examples, and the specific configuration of the applicable rolling mill and the specific detection data etc. It goes without saying that the processing method can be modified in various ways without departing from the gist.

【Effect of the invention】

According to the present invention, it is possible to control the shape of a rolled material with high precision at low cost by using an existing rolling mill. Therefore,
This improves the operability and productivity of post-processes without incurring large costs, and also improves product quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an example of a control system of a rolling mill applied to the embodiment, and FIG. 2 is an explanatory diagram showing the effects of the above embodiment in comparison with a conventional case. DESCRIPTION OF SYMBOLS 1... Work roll bender, 2... Work roll, 3... Backup roll, 4... Shape detector, 6... Reduction device, 8... Coil. 5... Load cell, 7... Rolled plate material,

Claims (1)

[Claims] (1) A method for controlling the shape of a rolled material in which the shape of the rolled material is controlled based on a value detected by a shape detector, comprising: a step of operating a work roll bender of a rolling mill based on the detected value; A method for controlling the shape of a rolled material, comprising: when the actual value exceeds a predetermined limit range, the rolling position is corrected to maintain the actual value of the work roll bender within the above-mentioned limit range. .