JPS5858912A - Controller for continuous rolling mill - Google Patents

Abstract

PURPOSE:To provide a titled device which improves the dimensional accuracy of rolled materials by detecting the sizes of the rolled material on the outlet side of rolling mills, controlling the draft positions of the rolling mill so as to make the deviation between the detected values and reference sizes zero and making combination use of a compensation signal as a contol signal. CONSTITUTION:The height size (hi) and breadth size (bi) of a rolled material 5 are detected by size detectors 61, 62 on the outlet side of the #i stand rolling mill 4 of continuous rolling mills having calibers, and the draft positions of the #i rolling mill 4 and #i-1 rolling mill 3 are controlled with control gain devices 19, 19 and controllers 18, 20 for draft positions so as to make the deviations DELTAhi, DELTAbi from respective reference sizes hREF, bREF zero. A compensating device 21 is inputted with the correction signal of the controller 18 for the purpose of compensation the influence upon the breadth size in accordance with the fluctuations in the draft position of the mill 4 and transmits the control signal for the draft position of the mill 3 in parallel with the controller 20 for the draft positions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous rolling mill having a hole shape, such as a steel bar rolling mill.
This invention relates to a device that controls the dimensions of rolled material in a wire rod rolling mill or the like.

An example of the configuration of a continuous rolling mill having a hole shape is shown in FIG.

Figure 1 shows a continuous rolling mill consisting of one stand, including (1) a one-stand rolling mill, (2) a two-stand rolling mill, (3) a one-stand rolling mill, and a four-stand rolling mill. ) is #1
The stand rolling mill (5) is a rolled material. In this example, a so-called VH type positive rolling mill is assumed, so a horizontal rolling mill (odd-numbered stands in Figure 1) and a vertical rolling mill (
%1 even-numbered stands) are arranged alternately.

For example, the 1-1 stand rolling mill (3) is a vertical rolling mill and performs rolling in the X direction. Here, Di-IVi4#
1-1 Stand rolling mill (3) Width dimension at exit side, h 1-
1t/'i represents the vertical dimension. The first stand rolling mill (4) is a horizontal rolling mill that performs rolling in the Y direction. Here, the width dimension at the exit side of the biij#i stand rolling mill (4), and hi represent the vertical dimension.

Conventionally, continuous rolling mills such as steel bar and wire rod rolling mills have tended to use loop control tension control to reduce the tension between stands to zero, and there has been no attempt to dynamically control the dimensions of the rolled material. The reasons for this are: (1) Extremely strict product dimensions were not required.

(2) Mill elongation due to load fluctuations during rolling is small.

(This fact requires greater precision in product dimensions to reduce the effect of transmitting fluctuations on the input side of the rolled material to the output side.

Therefore, conventional control has the drawback that dimensional fluctuations due to changes in stagnation, m degrees, etc. of the rolled material are not controlled, resulting in poor dimensional control.

The present invention has been made in view of the above-mentioned drawbacks, and includes:
Stand rolling mill (4) Detect the top, bottom and width dimensions of the material on the exit side, and use one stand rolling mill for each so that the deviations between these and the standard top and bottom dimensions and standard width dimensions are zero.
The rolling position of the stand rolling mill shall be controlled, and
The width fluctuation of the material on the exit side of the 1-stand rolling mill caused by the rolling F control of the 1-stand rolling mill is compensated for by correcting the rolling reduction amount of the 1-1 stand rolling mill, resulting in high accuracy in both the vertical and width dimensions. It is intended to be rolled into

FIG. 2 shows a control device according to an embodiment of the present invention.

In Figure 2, (3) is #1-1 stand rolling mill, (
4) tf#i stand rolling mill (final stand), (5
) is the rolled material, (61) is the #1 stand rolling mill, (4) a vertical dimension detection device that detects the vertical dimension of the rolled material on the exit side,
(62) is a width dimension detection device that also detects the width dimension, (
7), (8) are the drive motors for each stand, (9)
, (10) is a load cell that is attached to each stand and detects the rolling load, (ll), (12) is a pulse transmitter for detecting the rolling position connected to the rolling drive motors (7), (8), ( ]3 (14) is the rolling drive motor (7), (8
), a morph drive system that supplies power to (
15) (16) is the Mino 4 sex control cape device of each stand, (
17) is a control gain device that multiplies the deviation between the detected value h1 of the vertical dimension detection device (61) and the reference vertical dimension hiREF by a predetermined control gain, (1g) Fi, which applies P to the output signal of the gain device (17). (D) a rolling position control device that performs control and generates a rolling position correction signal for the ≠1 stand rolling mill (4), (19) #i the width dimension detection device (62
) a control gain device that multiplies the deviation Δb1 from the detected value t)i(: reference width dimension biREF) by a predetermined control gain;
(2(1) applies P control (D) control to the output signal of this control gain device (19), and
a pressure F position control device that generates a pressure reduction position correction signal (2);
1) Set #- to the pressing position 1 of the pressing position control device (18).
f correction signal is input, and the #1-1 stand rolling mill (3
), a compensating device that generates a control signal according to the input to the rolling F device, (22) a motor for driving the rolling roll of the i/'i≠1-1 stand, (23) a driving motor of the rolling roll of the lotus 1 stand. Drive motor, (24J, (25) is each motor (2
2), (23) drive cyrisk device, (26) is #
1-1 stand rolling mill (3) and Fri stand rolling mill (
4) It is a loop control device that controls the gap/L'-7't constant.As a conventional control system, the speed setting N i -I RK
Motor (22) of the 1-1 stand rotating at h'
M to #i-1 me 1 stand and 1 stand (4)
Mainly, the loop control device (26) was provided with a function of giving speed correction to the motor (22) of the 1-1 stand so that the loop between them was constant.

However, with this method alone, the product dimensions are determined only by the characteristics of the rolling mill, and dynamic dimensions are not possible. Also, as conventional technology, load cells (9), (10
), the mill rigidity control devices (15) and (16) detect the vertical dimension fvJ based on the rolling load detected, and the mill rigidity control (BISRA control) controls the rolling position. It is impossible to control the dimensions (direction, vertical direction), the absolute value of the dimensions is poor, and fC
3 An embodiment of the control device according to the present invention will be specifically described below.

The control device in the present invention controls the rolling position of the #1 stand rolling mill (4) for fluctuations in vertical dimensions of the material exiting from the 1st stand, and controls the rolling position of the #1 stand rolling mill (3) for fluctuations in width dimension. The necessity of this will be explained using FIG. 3.

Fig. 3(a) shows the rolling pressure F [S] of the #1 stand rolling mill (4).
Fig. 3(b) shows the vertical dimension h1 variation and width dimension b1 variation when changing i, and shows the variation when the rolling position 81-1 of the I/i 1-1 stand rolling mill (3) is changed. Top-to-bottom dimension h1-1 fluctuation width dimension b represents the vertical dimension h1 fluctuation and width dimension b1 fluctuation of i-1f@3 and #1 stand outlet side material.

As is clear from FIG. 3(b), even if the rolling position 81-1 of the 1-stand rolling mill (3) is changed, the vertical dimension h1 of the material on the exit side of the 1-stand rolling mill (4) remains unchanged. The rolling position S1 of the #1 stand rolling mill (4) must be controlled as shown in Figure 3 (IL). However, the rolling position S1 of the #1 stand rolling mill (4) σ) If this is controlled, the width dimension b1 will also change. Therefore, Figure 3 (b)
), notice that the width dimension of the exit side of the #1 stand rolling machine (4) changes due to the ink that changes the rolling position of the #1 stand rolling machine (3). The width dimension variation Δb1 on the exit side is compensated for by controlling the rolling F position of the 1-1 stand rolling mill (3).Similarly, the width dimension variation is clearly shown in Figure 3 (1)). The control q1 can be performed by changing the rolling position 5i-1 of the +1-1 stand rolling mill (3) as shown in FIG. At this time, the variation of hl due to 5i-1K has almost no effect.

Now, in Fig. 2, the deviation Δb1 between the detected value 01 of the width dimension detection device (62) installed on the exit side of the #1 stand rolling mill (4) and the reference width dimension is sent to the field gain device (19). Manpower. A control gain device (19) multiplies the result by a predetermined control gain Kb, which will be described below, and outputs the result. The control gain Kb of the control gain device (19) is δb1/δ81-1
It is expressed as °゛−°= (1). Here, 51-1 is the rolling position correction amount of the 1-1 stand rolling mill (3), and 11M of Kl) is the influence factor that Δ81-1 has on the width dimension variation Δb1 on the exit side of the #stand. represent.

The output of the control gain device (19) is the output of the control gain device (19).
0), the PI (D) system is applied, and it becomes a rolling position correction signal.
3) , reduction drive motor (7), pulse transmitter (11)
It is supplied to a rolling down device consisting of. Then, the motor drive thyristor device t (13 ), the motor (η is driven). On the other hand, the deviation signal 7hi l-i between the detected value h1 of the vertical dimension detection device (61) and the reference vertical dimension hiREF is input to the control gain device (17), and the following is performed. The control gain device (1
The control gain Kh of 7th is K h =, i/s x '”'”
'(2) makes me feel angry. Here, Sl is the rolling correction amount of the #1 stand rolling mill (4), and the value of Kh is ≠1.
It represents the influence coefficient on the vertical dimension Δh1 on the exit side of the stand.

The output of the control gain device (17) is the output of the control gain device (17).
18), it is subjected to PI (D) control and becomes a reduction position correction signal, and the thyristor device (14) of the na 1 stand is
), a screw-down drive motor (8), and a pulse transmitter (12) are supplied to a screw-down device, and the screw-down control is performed in the same manner as in the case of the above-mentioned ≠1-1 stand. Here, when the rolling position S1 of the #1 stand rolling mill (4) is controlled, as shown in Fig. 3 (
IL), the dimension b1 in the width direction also changes at the same time. Therefore, in order to eliminate the variation in the width dimension due to the correction of the rolling position of #4 #1 stand, the control amount of the rolling position of #1 stand rolling mill (4) is input to the compensation device (21), and the output is A correction is made to the rolling position of the 1-1 stand rolling mill (3).

In other words, the width variation caused by changing the rolling position of the 1-stand rolling mill (4) is Δbi, and #i-1 is the width variation caused by changing the rolling position of the 1-stand rolling mill (3).
If the width variation on the exit side of the 1-stand rolling mill (4) is Δb1, then if the rolling position of the 1-1-stand rolling mill (3) is controlled so that the value of Δb1 + Δb1 becomes zero, ≠ 1-stand rolling mill The width dimension b1 variation due to the rolling position control in (4) is compensated for.

Specifically, the rolling position correction signal generated by the rolling position control device (18) is inputted to the compensation device (21), and the rolling position of the #1-1 stand rolling mill (3) is controlled by the output thereof.

The compensating device (21) is used for rolling F of the #1 stand rolling mill (4).
The influence coefficient of width dimension on position change is Kbi, #j-1
Step 1 for converting the stand rolling mill (3) into a rolling lower allf
If the influence coefficient of the width dimension on the exit side of the stand is Kl)l-1, it can be expressed as the gain Kbit/Kbi.

Here, Kbi ke1/ (2bi/2Si), Kbi
-1 becomes 1/ (21)i/2Si-1).

In the above embodiment, the vertical dimension detection device (61) and the width dimension detection device (62) are installed on the exit side of the final stand, and the vertical dimension and width dimension of the material on the exit side of the final stand are controlled to the standard dimensions. However, a vertical dimension detection device and a width dimension detection device are installed between other stands,
It may also be used to control the dimensions of other materials on the exit side of the stand.

As described above, according to the present invention, the vertical dimension and width dimension of the material on the exit side of the first stand rolling machine are detected, and the first stand rolling is performed so that the deviation between these and the reference vertical dimension and standard width dimension is zero. The rolling position of the rolling machine and the 1-1 stand rolling mill shall be controlled, and the variation in the width dimension of the material on the exit side of the first stand due to the control of the rolling position of the first stand rolling mill shall also be controlled as described above. Since this is compensated for by correcting the rolling position of the 1-1 stand rolling mill, it is possible to roll with high precision in both the vertical and width dimensions.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a configuration example of a continuous rolling mill having a hole shape, Fig. 2 is a block diagram showing a dimensional control device in a continuous rolling mill according to an embodiment of the present invention, and Fig. 3(a) ,(1)
) is a characteristic diagram showing the relationship between changes in rolling mill position, vertical dimension variations, and width dimension variations. In the figure, (3) and (4) are the rolling mill, (5) is the rolled material, (61) is the t'j vertical dimension detection device, (62) is the width dimension detection device, and (7) and (8) is the compaction force. F drive motor, (9)
, (10) is a load cell, (13) and (14) are thyristor devices, (15) and (16) are mill rigidity control devices,
(17), (19) Vi control gain device, (18), (
21)) Press down position control device, (21) is a compensation device, (2
2), (23) Iri motor, and (26) the loop control device. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Hei Kuzuno

Claims (2)

[Claims] (1) In a device that controls a continuous rolling mill having a hole shape, a vertical dimension detection device detects the vertical dimension of the material on the exit side of the first stand rolling mill, and a width dimension of the material on the exit side of the first stand rolling mill. a width dimension detection device, a first device that inputs a deviation signal between the detection value of the top and bottom dimension detection device and a reference top and bottom dimension, and controls the rolling position of the first stand rolling mill so that these deviations become zero; The control device manually calculates the deviation between the detected value of the width dimension detection device and the standard width dimension, and corrects the rolling position to the device that controls the rolling position of the No. 1-1 stand rolling mill so that these deviations become zero. A second control device that generates a signal inputs the rolling position control amount of the first stand rolling mill controlled by the first control device, and outputs a corresponding control signal to control the rolling of the first stand rolling mill. 1. A control device for a continuous rolling mill, comprising a compensating device for supplying a signal to a position controlling device and compensating for fluctuations in width dimension due to rolling F position control of a first stand rolling mill. (2) The compensation device is located on the rolling position side of the first stand rolling mill @
Kbit, /Kbi (however, K
t) i is the influence coefficient of the width dimension on the change in the rolling position of the first stand, and Kbi-1 is the influence coefficient of the width dimension of the material on the exit side of the first stand rolling machine on the change in the rolling position of the 1-1 stand rolling mill. . 2. The control device for a continuous rolling mill according to claim 1, wherein the control device multiplies the resultant signal by a gain equal to .