JPS59178502A - System for measuring deviation in plate thickness - Google Patents

Abstract

PURPOSE:To improve the accuracy in measurement of plate thickness deviation of a feed-forward automatic plate thickness controlling device, by adding an actually measured plate length compensating device to the device. CONSTITUTION:The rotated quantity of a roll during a period from the time when a material 1 is put between rolling rolls 3 until the material 1 comes out from the rolls 3 is measured and a plate length l1 after 1-pass rolling and another plate length l2 after 2-pass rolling are found. By using the plate lengths l1 and l2, a distance between measuring points at the time of 1-pass rolling stored in a data storage device 10 is corrected to a value l2/l1 times as much as the stored distance by means of an actually measured plate length compensating device 12 after the 2-pass rolling is completed. Therefore, the corresponding position of the measuring point at the time of 1-pass rolling to the 2-pass rolled material can be found correctly. By performing such correction, the accuracy in measurement of plate thickness deviation of a feed-forward automatic plate thickness controlling device can be improved.

Description

[Detailed Description of the Invention] This invention provides feedforward automatic plate thickness control (hereinafter referred to as
The present invention relates to a method for measuring plate thickness deviation of a system (referred to as FF-AGC).

FIG. 1 shows a control configuration diagram of the reversible mill 0FF-AGC system. In the figure, 1 is a rolled material, 2 is a reversible rolling machine,
3 is a rolling roll, 4 is a rotation detector, 5 is a counter, 6 is a rolling load detector, 7 is a rolling device, 8 is a rolling position detector, 9
10 is a data storage device, and 11 is a reduction control amount calculation device. In this system, the rotation amount detected by the rotation detector 4 attached to the rolling roll 3 is counted by the counter 5 to measure the material feed length directly below the rolling roll, and the initial measurement rolling Sometimes, each time the material is fed a certain length, the rolling load and rolling position are measured, and from these, the plate thickness deviation calculation device 9 calculates the deviation amount from the preset reference plate thickness at that point, and calculates this. The information is sequentially stored in the data storage device 10. At the time of subsequent measurement rolling, the sheet thickness deviation amount at the same point on the material as the measurement point during the previous rolling is determined and sequentially stored. Furthermore, during the final rolling after a plurality of measurement rollings, when the same point as the measurement point reaches just below the rolling roll, the sheet thickness deviation data for that point stored in the data storage device 10 is sequentially retrieved, As a result, the reduction control amount calculation device 11
In this step, a target rolling position is determined based on the target position value that minimizes the plate thickness deviation after rolling, and rolling control is performed.

FIG. 2 is a rolling process explanatory diagram showing the correspondence between measurement points and control target points on the material. The conventional method of this association will be explained below. Here, after measuring rolling twice in the 1st pass and 2nd pass, the 3-bath method 0FF- is used to control the reduction in the 3rd pass.
Consider the AGC system. First, during one pass, calculate the plate thickness deviation every time the material is fed for a certain number of pulses N1, and when the tail end of the material comes out of the rolling roll, remember the length N1 from the final measurement point to the tail end. . Next, during the second pass, the rolling direction is reversed, so in order to match the final measurement point during the first pass with the first measurement point during the second pass, the rolling direction is reversed when the material is fed from the tail end for the first time. After that, repeat the measurement every time. However, in the above formula, 1+f1: Advancement ratio at 171 time 1+f2: Advancement ratio at 2 passes N2: Entry side plate thickness at 2 passes N3 = Entrance side plate thickness at 3 baths are all predicted amounts set before rolling.

On the other hand, the length of the plate after rolling fluctuates depending on the rolling conditions from time to time and cannot be predicted accurately (the predicted length after rolling and the actual length of the plate are usually different. Therefore, during two passes, rolling The measurement point during the first pass cannot be detected directly under the roll, and the fixed point during the first pass does not match that during the second pass.

However, because the measurement data from both passes were considered to be consistent and the reduction control amount was determined by directly comparing them, the thickness deviation measurement data lacked reliability, which in turn reduced the control accuracy of the AGC system. There were some drawbacks that caused this.

This invention was made to compensate for the drawbacks of the conventional method as described above, and by correcting the distance between measurement points during one pass using the actual board length after two-pass measurement as a reference,
It is an object of the present invention to provide a plate thickness deviation measuring method that allows measurement points during one pass to match those during two passes on a material, obtains highly reliable measurement data, and can be controlled with high precision.

Hereinafter, a plate thickness deviation measuring method according to an embodiment of the present invention will be described. FIG. 3 shows a configuration diagram of the plate thickness deviation measuring method according to the same embodiment. In Figure 3, the same symbols as in Figure 1 are the same.
12 in the figure is the plate length after 1 pass rolling obtained by 30 rotations of the rolls (11.2).
This is an actual plate length compensation device that uses the plate length shape after bus rolling and corrects it to p2/p1 times the distance measured during one pass, which is stored in a data storage device after completion of two-bus rolling.

The operation of this embodiment configured in this way will be described with reference to FIGS. 4 and 5.

FIG. 4 is a conceptual operation explanatory diagram showing data values of the positional relationship of each measurement point in the embodiment of FIG. 3.

In the same figure, the symbols ΔH1 and ΔH2 are Jl, 1 pass, and 2 pass, respectively.
The measurement values during the pass are shown, and a number indicating the order of measurement is added to the upper right of these symbols. Therefore, a method for correcting plate thickness deviation will be specifically explained next.

First, the plate length after 1-pass rolling, obtained by measuring the amount of roll rotation from the time when material 1 is caught between the upper and lower rolling rows A/3 to the time when material 1 comes out, is □ after 2-pass rolling. Using a plate length of 1□, after the completion of two-pass rolling, the distance between measurement points for one pass stored in the data storage device 10 is corrected by A27131 times by the actually measured plate length compensator 12.

This makes it possible to accurately determine the corresponding position on the material after two-pass rolling of the measurement point during one pass. Next, if the number of measurements during the 1st pass and the 2nd pass is different, it is necessary to measure at the same point on the material, but even after the above correction, the measurement points during the 1st pass and the 2nd pass cannot be measured. In order to solve the problem that the numbers do not match, data is serialized in five length dimensions.

FIG. 5 is a measurement data diagram showing deviation measurement values with respect to the length position of the plate material. That is, as shown in FIG. 4, the plate thickness deviation is assumed to take an intermediate value between two measurement points. As a result, whereas conventionally each measurement point was treated as a constant value, the measurement value at any point on material 1 is treated as a value that changes substantially continuously as shown by the broken line. This can be obtained approximately, and the measured value for the 1-pass measurement point for the 2-bus measurement point can be found by the simple lJ: $ : J "f. Therefore, the measurement points for the 1-bus measurement and the measurement points for the 2-bus measurement can be found as a fact. Since the same J° lobe can be made on the upper material, extremely high precision measurement data can be obtained.

As described above, according to the present invention, when measuring multiple times, it is possible to compensate for the measurement error of the plate thickness deviation amount due to the mismatch on the material of each pass measurement point. Errors between the actual value and the actual value such as ratio, entrance plate thickness, etc. do not affect the control accuracy, so a highly accurate AGC effect can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a plate thickness deviation measurement method in a conventional feedforward automatic plate thickness control system, and Fig. 2 is a correspondence diagram between measurement points and control target points in the conventional feedforward automatic plate thickness control system.
FIG. 3 is a block diagram of a plate thickness deviation measuring method according to an embodiment of the present invention, FIG. 4 is a conceptual explanatory diagram showing the positional relationship of measurement points according to the embodiment of FIG. 3, and FIG. It is a measurement data diagram showing the deviation measurement value with respect to the length of the plate material in the illustrated example. DESCRIPTION OF SYMBOLS 1... Rolling material, 2... Reversible rolling machine, 3... Rolling roll, 4... Rotation detector, 5... Counter, 6...
- Rolling load detector, 7... Rolling down device, 8... Rolling down position detector, 9... Plate thickness deviation calculating device, 10... Data storage device, 11... Rolling down control amount calculating device, 12...
・Actual board length compensation device. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Makoto Kuzuno - (1 other person) Tea 4 Figure

Claims (1)

[Claims] In the plate thickness deviation measurement method of a feedforward automatic plate thickness production device that measures the deviation of the plate thickness of the rolled material during the process of performing multiple reversible rolling passes on the same rolled material, The actual plate length of the rolled material is measured, and the error in the corresponding measurement position between the measurement point in the first rolling pass operation and the measurement point in the second rolling pass operation is calculated based on the actual plate length using an actual plate length compensation device. A plate thickness deviation measurement method characterized by compensation.