JPS5858914A - Controller for continuous rolling mill - Google Patents

Abstract

PURPOSE:To provide a titled device which can improve the dimensional accuracy of rolled mateials by controlling the draft positions of rolling mills on the upper stream so as to eliminate the fluctuations in the breadth on the outlet deviations between the sizes of the rolled materials between arbitrary stands and reference sizes. CONSTITUTION:The height and width sizes of the rolled material 5 on the inlet side of the #i-1 stand rolling mill 3 of continuous rolling mills having calibers are detected with size detectors 61, 62, and from the deviations between the detected values and reference sizes, the rates of fluctuations are calculated by dividers 25, 26. Further, the fluctuations generated in the breadth sizes on the outlet side of the mill 3 are predicted with predicting devices 27, 28. From the deviations between the total of the predicted values and the reference sizes, the predicated rate of fluctuations in the breadth size is calculated by a divider 29, and further the fluctuations in the breadth size of the rolled material 5 on the outlet side of the #i stand rolling mill 4 are predicted with a predicting device 30. The predicated values are inputted to a control gain device 31, which generates a correction signal for the draft position of the mill 3 and controls the draft position of the mill 3 in order to eliminate the predicated fluctuations in the breadth.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous rolling mill 1 having a hole shape, for example, for rolling steel bars.
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 with a hole shape is shown in Fig. 1.

Figure 1 shows a continuous rolling mill consisting of two stands: 11) is a #l stand rolling mill, 2) is a #2 stand rolling mill, C3) is a #1 stand rolling mill, and (4) is a #1 stand rolling mill. teeth#
- Stand rolling mill (51 is the rolled material. In this example, one so-called VH type rolling machine is assumed, so the vertical rolling mill and the horizontal rolling mill are alternately installed (two machines are used). For example, the @i-l stand rolling mill (3) is a vertical rolling mill, and the rolls in the Width dimension hL
-1 represents the vertical dimension, father, #b stand rolling machine 14
1 is a horizontal rolling mill 3 which performs rolling in the Y direction, where bL is the width dimension at the exit side of the #L stand mill (4), and hL is the vertical dimension.

Conventionally, continuous rolling mills such as steel bar and wire rod rolling mills have been controlled by loop control and tension control to reduce the tension to zero between stands. -ta. The reason for this is: 1) Extremely strict product dimensions were not required. ■The elongation of the mill due to load fluctuations during rolling is small. (This fact reduces the effect of transmitting fluctuations on the input side of the rolled material to the output side, improving the accuracy of product dimensions.)

Therefore, conventional control does not control dimensional fluctuations due to changes in temperature of the rolled material, etc.

There was a drawback that dimensional accuracy deteriorated.

The present invention has been made in view of the drawbacks mentioned in -h, and it predicts the amount of variation that the deviation between the rolled material dimension and the reference dimension between arbitrary stands will have on the width dimension of the downstream @L constant side material, The purpose is to eliminate this variation (compensate by controlling the rolling f position of the $L-1 stand and to enable rolling with high accuracy in one dimension).

FIG. 2 shows an embodiment of the present invention. In Figure 2, (
3) is #L-! Stand rolling mill, (41 is #Rustan'
rolling mill (final stand), +51 is rolled material,
(61) is a vertical dimension detection device that detects the vertical dimension of the rolled material (5) on the entry side of stand #b-1, and (62) is a width dimension detection device that also detects the width direction dimension + ! 7
1181 is the motor for lowering each stand, +91u
Q is each stand +111α4 is the above pressure FIK movement motor t
7+, +81 are connected to the pulse winding signal for detecting the rolling position, ・13Q4 is a motor driving cyrisk device that supplies power to the rolling driving motor t71.181, (15) il
l is the mill rigidity control device for each stand.

■ is the drive motor for the rolling roll of #-1 stand rolling mill (3), +21) is the drive motor for the rolling roll of #f stand rolling mill (4), @■ is the drive of each motor ■, Q1) Thyristor device, (24) is #↓-1 stand 1
3) and #distant (loop control device that controls the loop position between 41 at a constant level, □□□ is the vertical dimension detection device (61)
Detected value hi=-2 and standard vertical dimension hL-2(Pk
LF ) deviation signal and reference vertical dimension hA-2 (PEF)
A divider that divides .

;■ is the detection value bL-z of the width dimension detection device (62) and the deviation signal of the reference width dimension b=-2 (RWF) and the reference width dimension b
A divider that divides L -2 (REF'), @ is the output of the above divider [existence] @ L-1 stand rolling mill (3)
Prediction device for predicting variation in output side width dimension 1. ＠ is the above-mentioned pain reliever ゛ (from the man's output #L-1 stand rolling machine (
31 Prediction device 2 predicts the variation in the width dimension on the exit side, (to) the signal Δbi=-1 which is the sum of the outputs of prediction device l@ and prediction device 2@ and #L-1 stand rolling mill (3) A divider that divides the reference width dimension OL-1 (RIIF) on the output side, (30) is the output input of this divider (29), #
L constant rolling mill (4) Prediction device for predicting width variation on the exit side 3. (31) is a control gain device which multiplies the output signal of the prediction device 3 by a predetermined control gain to generate a signal for correcting the rolling position of the stand rolling mill by #L=1°.

In the conventional method, the loop ambiguity between the #L-1 stand (3) and the #↓ distant 41 is set for the #L-1 stand motor (A) rotating at the continuous setting N↓-1 (RFP). @L from the loop control device (2) so that
-1 The one with the function of modifying the speed of the motor was the king.

However, using only the above method, the product dimensions are determined only by the characteristics of the rolling mill, and dynamic dimension control is not possible. Father, load cell 191 as conventional technology,
(1119 detects the fluctuation of the vertical dimension and controls the rolling F position.)
Although sRA system a) exists, it is impossible to control dimensions in both directions (one direction, vertical direction), so the accuracy of absolute values of dimensions is poor.

The control device of the present invention shown in FIG. 4)
The width variation ΔbL on the exit side is predicted, and the predicted width variation Δ and others are eliminated by correcting the rolling position of the #↓-1 stand rolling mill +31.

★.

The necessity of predicting the width variation Δb and correcting the rolling position of the @4-1 stand rolling mill (3) will be explained with reference to FIG.

Figure 3 1al shows the vertical dimension hL fluctuation and width dimension b when changing the rolling position S L of the #Rustand rolling mill (41).
↓Represents the fluctuations, and Fig. 3 1al shows the vertical dimension h = -1 fluctuation 1 width dimension i) L -l fluctuation and # b Constant rolling mill (4) Exit side vertical dimension) IL fluctuation 1 Width dimension 1) Lf movement is shown.

As is clear from Fig. 3 1al, even if the rolling position 5L-1 of the -6A 1-stan F rolling mill (3) is changed, the vertical dimension hL of the exit side of the #L stand rolling mill (41) hardly changes. 1 Width dimension bb fluctuates - around. Father, #b stand rolling mill (If you correct the rolling position SL of 41, @3
As is clear from Figure +a), the width dimension bL changes and the vertical dimension hL also changes at the same time.

In the present invention, when the rolling position 5i-1 of @b-l stand rolling mill (3) is corrected, #L stand rolling mill (4
) Only the width dimension bL on the exit side changes, but the top and bottom dimensions hardly change. In Fig. 2, #↓-1 stand rolling mill (3)
The vertical dimension hi-2 and width dimension b=-2 detected by the vertical dimension detection device (61) and width dimension detection device (62) installed on the entrance side and the # sea 1 stand rolling mill (3: entrance side Standard vertical dimension h=-z (mwF) and standard width dimension bA
The deviation signals from -1 (RRF) are input to the dividers (to) and (to), respectively. Divider 4 (to) inputs the deviation signal (hL-2(REF) -hL-2),
(bi-2(RmF)-oL-2) is the standard vertical dimension,
Divided by the standard width dimension, respectively #L-1 stand rolling mill (31 people side vertical dimension fluctuation rate (hμ2 (REF)
hL-2) / hL4 (RHF) and width dimension variation rate (b sea 2 (RIICF') - bL-2) /
Obtain bIl-z(ugr).

The output of the divider (c) is input to the prediction device -@, and the output of the divider +261 is input to the prediction device 2@. The prediction device l@ is input based on the influence coefficient of the vertical dimension change 1 rate of the input side of #↓-l stand rolling mill (3) on the width dimension degree i of the exit side of #b-1 stand rolling mill (3) The width dimension variation on the exit side of the #L-1 stand rolling mill (3) with respect to the vertical dimension variation rate is predicted and output. On the other hand, prediction device 2 (to) is @L
-1-stand rolling mill (3) The width dimension variation rate on the entry side is @
#b- for the input width dimension variation rate by the influence coefficient on the width dimension variation on the exit side of the L-1 stand rolling mill (3)
1-stand rolling mill] 3) Predict and output the width dimension variation on the exit side. Therefore, by adding the outputs of the prediction devices 1@ and 2@, it becomes possible to predict the width dimension variation Δray-1 at the exit side of the #L-1 stun V rolling mill (3).

Note that the vertical dimension variation Δh=-1 on the exit side of the $E L-1 stand rolling mill (3) is a small and negligible value compared to the width dimension variation ΔbL-11- because the mill rigidity of the rolling mill is high. The predicted @ L-1 stand rolling mill (3) exit side width dimension variation Δ: 1a-1 is input to the divider (to).
↓-1 stand rolling mill (3) Divided by the standard width dimension on the exit side to obtain the width dimension fluctuation rate (ΔbL-1/ bQ-s (RgF)
becomes. The output of the W remover ■ is input to the prediction device 3 (30). Prediction device 3 (30) shows that the width dimension variation rate on the exit side of the #1 stand rolling mill (3) is the #L stand rolling mill (
41 Divide by the influence coefficient on the width dimension of the exit side, calculation 4@
Width dimension variation rate Δbru1/bA-s(R
The width dimension variation ΔbQ on the exit side of the #L stand rolling mill +41 with respect to EF) is predicted and output.

In addition, the prediction device -, +281. The influence coefficient (30) is a proportional gain, which is a numerical value determined by the characteristics of the rolling mill and the properties of the rolled material, and is a value that can be calculated in advance. The output of the prediction device f3 (30) is the control gain device 1
(31) is input. The control gain device (31) generates a rolling position correction signal to correct the rolling position of the stand rolling mill (3) in order to eliminate the predicted width variation ΔbL on the exit side of the stand rolling mill (4). . Technically, the width variation ΔbL generated by the prediction device 3 (30) is multiplied by a predetermined control gain to find the reduction correction amount, but the value of the control gain is #↓ shown in Figure 3+l)l. - Determine from the slope of the change characteristic of the width dimension bL on the exit side of the #L stand due to the change in the rolled down position of the stand 5L-1.

be able to. The rolling position correction signal of the control gain device (31) is made up of a motor drive thyristor device 3 for controlling the rolling position of the xi-1 stand rolling mill (3), a rolling drive motor (7), and a pulse transmitter αυ. It is supplied to the rolling control device of the @L l stand and controls the rolling position of the $A-1 stand rolling mill (3). That is, until the one-pressure-down position signal detected by the pulse transmitter I matches the pressure-down position correction signal, the motor-driving thyristor device ff3 drives the pressure-down drive motor (7),
The rolled position is corrected.

Now, FIG. 4 shows another embodiment of the present invention.

In the embodiment shown in Fig. 4, a vertical dimension detection device (61) and a width dimension detection device (62) are installed on the exit side of the #b-1 stand, and in the prediction device 1 @, the exit side of the stand rolling mill (3) is installed on the #b-1 stand exit side. Vertical dimension variation rate (hA-t(REF) hA-t)/h#-
t(REF) is the input vertical dimension variation rate (REF) h=-t)/hi-1(RE
The prediction device 2 predicts and outputs the width dimension of the exit side of the #b stand rolling mill (4) for the #B stand rolling mill (F). #-5(R
EF) b route) / b sheath (REF) is #L constant rolling mill + 4 + the coefficient of influence that it has on the vertical dimension variation on the exit side, the width dimension variation rate (bA-x (REF)
) -b=-t)/r:)iJ-t(Rgp)
Predicts and outputs the width dimension of the exit side of the #b distant rolling mill (41) for the #b distant rolling mill (41). Therefore, the signal obtained by adding the outputs of the prediction device [1i1 (5) This is the width dimension variation bL on the output side of the machine (41). This width dimension variation bL is supplied to the control gain device (31), and the second
In the same way as the device shown in Figure 1, the F position of the 1-stand rolling mill (3) is controlled.

Equipped with width dimension detection device! However, it is also possible to install only one of them and predict the dimensional variation of the exit side of the #b constant rolling mill 141 based only on the vertical dimension variation rate or the width dimension variation.

Moreover, the vertical dimension detection device (61) of the embodiment described in .

It may be calculated as the pressing position, mill spring constant, rolling direction, etc., or it may be detected by other means.

According to the present invention, it is possible to predict the amount of variation that the deviation between the dimensions of the rolled material and the reference dimensions between arbitrary stands will have on the width dimension at the exit side of the stand rolling mill located in the flow,
Since the rolling F position of the ↓-1 stand is corrected in order to remove this variation, rolling can be performed with high dimensional accuracy.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an example of the configuration of a continuous rolling mill having a hole shape, Fig. 2 is a block diagram showing a dimensional side gun device of an embodiment of the present invention, @3 Fig. 1al, lbJ is a rolling mill FIG. 4 is a characteristic diagram showing the relationship between the pressure F position and the vertical and width dimensions of the material; and FIG. 4 is a block diagram showing another embodiment of the present invention. In the figure -+31. +41 is the rolling machine, (5) is the rolled material, (61) is the vertical dimension detection device, (62) is the width dimension detection device, (7) and (8) are the rolling drive motors, +
91. (l (I is a load cell. u31. (141 is a motor drive thyristor device 1.5
．． +2υ is the motor, (2), , n, tn are the dividers,
(2) is a prediction device, and (31) is a control gain device. In addition, the same reference numerals in each figure indicate the same or equivalent parts. □ Agent Makoto Hinoki - (712) Figure 3 (b) Procedural amendment (voluntary) Mr. Commissioner of the Japan Patent Office 1, Indication of the case Patent Application No. 7218 No. 11/1982 2, Title of invention: Continuous rolling mill control device 3, Person making the amendment 5, Subject of amendment (1) “Detailed description of the invention” column (2) of the specification drawing(
(Fig. 4) 6. Contents of the amendment (1) Changed "More three-stiffness control" on page 5, line 19 of the specification to "
Corrected to ``more rigidity control''. (2) "Width dimension detection device" in the second line of page 12 of the same book is corrected to "width dimension detection device." (3) In the same book, page 12, line 7, "Millspring constant" is corrected to "Millspring constant." (4) Figure 4 of the drawings will be corrected as shown in the attached sheet. 7. List of attached documents (1) Drawings (Figure 4) 1 or more copies

Claims (1)

[Claims] In a device that controls a continuous rolling mill having a hole shape, a dimension detection device for detecting the dimensions of a rolled material between arbitrary stands;
The width dimension variation that the deviation between the detected value of this dimension detection device and the reference dimension has on the material exiting from the rolling mill at the B stand located downstream is determined based on the influence coefficient determined in advance based on the characteristics of the rolling mill and the properties of the rolled material. 2. A control device for a continuous rolling mill, characterized in that it is equipped with a rolling position control device that corrects the rolling position of the ll-1 stand rolling mill based on the predicted value of the prediction device.