JPH08132112A - Method for automatically controlling thickness of shapes - Google Patents

Abstract

PURPOSE: To provide a method for automatically controlling thickness by which shapes such as an H beam, I beam and channel are rolled at a low cost and with high accuracy in universal rolling. CONSTITUTION: The positions of the barrel parts of horizontal rolls 1, 2 of a universal mill are detected with sensors 8, 13 provided on the ground, the fluctuation of horizontal-roll gap is operated and the opening degree between the horizontal rolls is controlled so that this fluctuation is eliminated. On the other hand, as to also respective vertical rolls 3, 4 on the driving and working sides, the positions of the barrel parts of the vertical rolls or the positions of respective balancing cylinders 12 for the vertical rolls are detected with the sensor 14 provided on the ground, the amount of gap between the vertical rolls and the side faces of the horizontal rolls is calculated and the positions of the respective vertical rolls are controlled so that this fluctuation is eliminated. In this way, the control system becomes a very simple and inexpensive one and very highly accurate automatic thickness control is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic plate thickness control method for universal rolling of shaped steel such as H-shaped steel, I-shaped steel and channel steel.

[0002]

2. Description of the Related Art Automatic plate thickness control of conventional H-shaped steel, I-shaped steel, grooved steel and other shaped steel by universal rolling is disclosed, for example, in Japanese Patent Publication No. 63-66608 and Japanese Patent Publication No. 61-24083.
As disclosed in the publication, basically, based on the horizontal and vertical rolling loads and the roll gap calculated from the horizontal and vertical reduction positions or the position of the reduction device, a model formula is applied to the calculation, The thickness of the web and flange was controlled.

However, this has a problem in accuracy of load detection, that is, there is a disturbance due to the accuracy of the load cell itself and the friction between the chock and the housing, and it has been difficult to obtain a good load value.

Further, the relationship between mill elongation and rolling load is not linear, and this relationship is difficult to model exactly, and
Since rolling progresses simultaneously on the shaped steel web and flange,
It was also difficult to build a model of rolling phenomenon. Even if these can be strictly modeled, the control calculation becomes complicated, so that the computing unit is required to have a high capability, which also causes a cost increase of the automatic plate thickness control device.

[0005]

As described above, in the conventional technique, it is difficult to obtain a high control precision because it is difficult to detect the load, the elongation of the mill, the modeling of the rolling phenomenon of the universal rolling, and the control model logic. It was complicated and the control device was expensive. Further, if an inexpensive control device is used, it takes time for the scan time, which is unsuitable for automatic plate thickness control that requires a dynamic function.

The present invention provides an automatic plate thickness control method for a shaped steel, which is inexpensive and can perform automatic plate thickness control with high accuracy, instead of such a conventional control method.

[0007]

In order to solve such a problem, the present invention detects the position variation of each horizontal / vertical roll position due to rolling load by directly measuring each horizontal / vertical roll position from the ground. However, this signal is added as a correction to the conventional rolling position control device, and the gist thereof is as follows.

According to the present invention, in a universal mill consisting of horizontal rolls and vertical rolls, the position of the body of the horizontal rolls is detected by a sensor installed on the ground so that the upper and lower horizontal roll gaps fluctuate due to fluctuations in rolling load. The horizontal roll opening amount is controlled so as to eliminate this fluctuation.On the other hand, for each driving side / working side vertical roll, the position of the body part of the vertical roll or each driving side / working side vertical roll balance cylinder By detecting the position with a sensor installed on the ground, the gap amount between the vertical roll and the side of the horizontal roll due to the fluctuation of rolling load is calculated, and the vertical roll positions on the driving side and the working side are calculated so as to eliminate this fluctuation. This is an automatic plate thickness control method for shaped steel, which is characterized by controlling.

[0009]

By the above means, the amount of fluctuation of each horizontal / vertical roll position due to rolling load is corrected by each roll position control device without changing the configuration of the conventional horizontal / vertical roll position control device. Therefore, highly accurate strip thickness control in universal rolling can be easily realized.

[0010]

The present invention will be described in detail below with reference to the drawings by taking an H-shaped steel as an example.

1 (a) and 1 (b) show the rolled state of the H-section steel 20 by a universal mill. The H-section steel web is rolled by the upper horizontal roll 1 and the lower horizontal roll 2 to obtain the H-section steel of the H-section steel. The driving side flange is rolled by the driving side vertical roll 3 and the upper and lower horizontal rolls 1 and 2, and the working side flange of the H-shaped steel is rolled by the working side vertical roll 4 and the upper and lower horizontal rolls 1, 2.

FIG. 2 shows a block diagram of an apparatus for carrying out the control method of the present invention. First, in FIG. 2, an upper horizontal roll 1, a lower horizontal roll 2, a drive side vertical roll 3 and a working side vertical roll 4
Are initially set to the rolling position, and at the same time when the rolled material is bitten, the mill is stretched by the rolling load F _{H in the} vertical direction with respect to the web rolling portion.

This amount of expansion is determined by the horizontal rolls 1, 2, the horizontal bearings 5, the horizontal chocks 6, the horizontal rolling-down and rolling-up devices 7.
a, 7b, a housing, etc., and the increment of the initial roll gap amount Hδ _GAP0 due to the vertical rolling load F _H ,
Lower horizontal roll position detector 8 installed between the lower roll and the ground
Can be detected by.

FIG. 3 shows a case where a gap meter is used. The lower horizontal roll position due to the vertical rolling load is HΔ.
It goes down by δ _B. Therefore, the horizontal roll gap is Hδ _GAP
= Hδ _GAP0 + ( _{HΔδ B} + α × _{HΔδ B} ).

Here, α is a deformation ratio coefficient for the upper horizontal roll system and the lower horizontal roll system. If the upper horizontal roll position detector 13 can be installed as shown in FIG. 3, the horizontal roll gap becomes Hδ _GAP = Hδ _GAP0 + ( _{HΔδ B} + H
Δδ _T )

These fluctuation amounts are input as correction values to the horizontal reduction driving devices 21 and 22 via the δ _GAP calculator 15 to immediately perform horizontal roll gap adjustment. In order to adjust the horizontal roll gap here, instead of the horizontal reduction device,
The horizontal lifting device 7a may be moved. Further, both the horizontal rolling down / upping devices 7a and 7b may be moved.

Next, the flange rolling section will be described below by taking the drive side vertical roll 3 shown in FIGS. 2 and 4 as an example. The rolling load F _{V in the} horizontal direction causes the mill to stretch. This amount of extension is the vertical roll 3, vertical bearing 9, vertical chock 1
0, vertical down pressure device 11, housing and the like.

Due to the horizontal rolling load F _V , the increment of the initial roll gap amount _V δ _GAP0 DS is detected by the vertical roll position detector 14 installed between the vertical roll on the driving side and the ground, and the actual gap increment is the same as above. Vδ _GAP DS = Vδ _GAP0
It is calculated by DS + VΔδDS. This variation amount is input as a correction value to the drive side vertical pressure reduction drive device 23, and the drive side vertical roll gap adjustment is immediately performed.

By the way, since it is generally difficult to detect the positions of the vertical rolls 3 and 4 with a machine, the vertical roll balance cylinder 12 position shown in FIG. 2 can be used instead. In this case, the vertical roll 3 and the bearing 9 due to the rolling load
And the amount of compressive deformation of the vertical chock 10 bearing portion cannot be detected, but in general, the amount of deformation at this portion is small, and since the ratio of the vertical roll system to the total mill elongation is as small as several% or less,
The effect of flange thickness accuracy is small. The work side vertical roll position adjustment is performed in the same manner as the drive side vertical roll position adjustment.

Although the present invention has been described for the case of the universal mill, it is of course applicable to the roll gap control of the 2 hi mill, and also for the case of the universal rolling.
It is also possible to apply it horizontally or only on one side of the vertical.

In order to realize a more ideal absolute value plate thickness control, as shown in FIG.
It is also possible to install the plate thickness gauges 26a and 26b at the position of and to use the monitor AGC based on the measured plate thickness together, which makes it possible to perform ideal absolute plate thickness control in consideration of roll wear.

[0022]

As described above, according to the present invention, the positions of the horizontal roll and each vertical roll of the shaped steel rolling mill are detected by the sensors installed on the ground, and the fluctuation amount is calculated to calculate the conventional rolling position. By controlling each roll position so as to eliminate this fluctuation in addition to the control device, it is possible to solve the problems of conventional control cost increase and accuracy deterioration due to disturbances, etc. Is extremely simple and inexpensive, and extremely accurate automatic plate thickness control can be performed.

[Brief description of drawings]

1A and 1B are H by a universal mill.
It is sectional drawing which shows the rolling state of shaped steel.

FIG. 2 is a drawing showing an example of the configuration of an apparatus for carrying out automatic section steel thickness control of the present invention.

FIG. 3 is a drawing showing a configuration example of an apparatus for performing plate thickness control of a horizontal roll using a gap meter.

FIG. 4 is a diagram showing a configuration example of an apparatus for performing plate thickness control of a vertical roll.

FIG. 5 is a drawing showing an installation example (a) of a plate thickness gauge in the case of H-shaped steel rolling by a universal mill and a cross-sectional example (b) of the H-shaped steel.

[Explanation of symbols]

1 Upper horizontal roll 2 Lower horizontal roll 3 Drive side vertical roll 4 Working side vertical roll 5 Horizontal bearing 6 Horizontal chock 7a Horizontal rolling down device 7b Horizontal rolling up device 8 Lower horizontal roll position detector 9 Vertical bearing 10 Vertical chock 11 Vertical rolling down device 12 Vertical Roll Balance Cylinder 13 Upper Horizontal Roll Position Detector 14 Vertical Roll Position Detector 15 δ _GAP Calculator 20 H-Shaped Steel 21 Horizontal Rolling Down Drive 22 Horizontal Rolling Up Drive 23 Driving Side Vertical Down Drive 24 Working Side Vertical Down Drive unit 25 Universal mills 26a, 26b Thickness gauge

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B21B 37/18 BBG B21B 37/08 BBG 37/12 BBG

Claims (1)

[Claims] 1. In a universal mill consisting of horizontal rolls and vertical rolls, the position of the body of the horizontal rolls is detected by a sensor installed on the ground to calculate fluctuations in the upper and lower horizontal roll gaps due to fluctuations in rolling load. The horizontal roll opening amount is controlled so that this fluctuation disappears.On the other hand, for each drive-side / work-side vertical roll, the vertical roll body position or each drive-side / work-side vertical roll balance cylinder position is set. By detecting with a sensor installed on the ground, the amount of gap between the vertical roll and the side of the horizontal roll due to fluctuations in rolling load is calculated, and the vertical roll positions on the drive and work sides are controlled so that this fluctuation disappears. An automatic plate thickness control method for shaped steel, which is characterized in that