JPS5949083B2 - Steel plate continuous rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides continuous rolling equipment (・
Regarding this.

Conventionally, as a means of correcting the crown, which is one of the elements that define the profile of the steel plate, the plate of each part in the width direction of the steel plate,
The thickness was actually measured after rolling, and based on this value, the operator adjusted the rolling pitch, adjusted the rolling load distribution for each stand, or adjusted the rolling reduction on the drive side and work side of the rolling mill 1. With these methods, it takes time to determine the actual measurement, and it is not possible to quickly correct a defective profile.

Moreover, changing the rolling load distribution has a negative effect on the plate temperature and plate thickness accuracy, adjusting the rolling pitch leads to a decrease in efficiency, and adjusting the rolling mill reduction has problems in terms of the ability of the plate to pass through the rolls. It is extremely difficult for an operator to accurately select the optimum value for each element by considering all factors.

In addition, as another means of obtaining the desired crown, it has been conventionally practiced to grind the profile of the roll prior to rolling so as to obtain the desired crown, but as the amount of rolling increases, the The roll profile changes due to expansion or wear, and there is a limit to the amount of roll that can be rolled per 10 mm.

In order to improve the drawbacks of the conventional crown control method, a method of automatically controlling the crown using a computer has recently been proposed.

For example, a detector installed on the exit side of a rolling mill detects the thickness, width, temperature, etc. of the material to be rolled, and a computer calculates the roll bending mi f using a predetermined crown model formula. A method for automatically controlling load distribution to each rolling mill or a means for automatically controlling load distribution to each rolling mill is also well known.

However, conventional crown control using a computer has problems in terms of accuracy or control formula.

The present invention solves the above-mentioned difficulties in the conventional crown control method in continuous rolling of steel plates, and uses a rolling mill that can change the inclination angle of the work roll axis with respect to the rolling direction. , the purpose is to provide a new rolling equipment that can control the crown of a steel plate continuously and accurately and quickly, and its gist is as follows:
In a continuous steel plate rolling facility consisting of a tandem rolling stand with a work roll and a backup roll, the work roll axis is passed through using the detected amount from the profile detector installed on the exit side of the final finishing stand as an input signal. an arithmetic and control device that calculates the amount of change in the angle of inclination with respect to the plate direction and outputs a work roll operation command signal; and a hydraulic pressure 'fa' that operates the work rolls of any number of the stands in accordance with the work roll operation command signal.
There is provided a continuous steel plate rolling facility, characterized in that it is equipped with an Im device.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a finishing rolling mill, and 2 is a front rolling mill.

(In the present invention, the final rolling mill among the tandem continuous rolling equipment for steel sheets is referred to as a finishing mill.

) In actual continuous steel plate rolling equipment, it is common for 4 to 6 rolling mills to be installed in tandem before the front stage rolling mill 2, but in Figure 1, only two adjacent stands are shown for convenience of explanation. only shown.

The finishing rolling mill 1 and the front rolling mill 2 each include an upper work roll 3.3', a lower work roll L'4t4/, an upper backup roll 5, 5/, and a lower backup roll 6.
．． It consists of 6/.

Reference numeral 7 denotes a profile detector provided on the exit side of the finishing rolling mill 1, and the profile detector 7 scans the steel plate 8 in the width direction using X-rays or γ-rays to measure the thickness. 7a, and a central fixed thickness gauge 7b for measuring the thickness at the center position in the width direction.

Reference numeral 9 denotes an arithmetic and control device which calculates the amount of operation of the work roll using the signal from the profile detector 7 and other set values described later as input signals.

Reference numeral 10 denotes a hydraulic control device which receives a work roll operation command signal from the arithmetic and control device 9 and issues a hydraulic control command to the work rolls of each rolling mill.

Hydraulic cylinders 11 to 14 and 15 to 18 are provided so that the upper and lower work rolls 3 and 4 of the finishing rolling mill 1 can be moved horizontally relative to a stand housing (not shown).

11' to 14' and 15I-18/ are upper and lower work rolls 3/ of the front rolling mill 2.

4' is a hydraulic cylinder that moves horizontally.

The hydraulic cylinders of each stand are connected so that a hydraulic control command signal from the hydraulic control device 10 is input thereto.

Next, the apparatus of the present invention will be explained in more detail with reference to FIG.

19 is the stand housing of finishing rolling mill 1, 20.20
' is a backup roll chock that supports the upper backup roll 5 and the lower backup roll 6, respectively;
21. 21' is a wind dryer inserted into the stand housing 19. 22. 22' is an upper and lower work roll 3, 4.
These are the upper and lower work roll chocks that support the.

23°23' is a position detection end for detecting the separation distance between the wind liners 21, 21' and the upper and lower work roll chocks 22, 22';
For ', a well-known magnet scale using magnetism or a potentiometer using drowsiness resistance can be used.

24 is a lowering device, 25 is an upper work roll control servo valve,
26 is a lower work roll control servo valve, and 27 is a hydraulic pump.

Although FIG. 2 shows only one side of the stand (for example, the work side), the upper and lower work roll chocks located on the opposite side (drive side) also have position detection ends 23 and 23'.
and similar devices (not shown) for each upper and lower work roll control servo valve 25,26.

The operation of the apparatus of the present invention having the above structure will be explained next.

The profile detector 7 inputs a signal of the difference between the average value of the center thickness and the both end thicknesses in the width direction of the steel plate to the arithmetic and control unit 9, and the deviation from the preset target crown value is determined. The arithmetic and control device 9 calculates the amount of work roll operation according to the deviation value and sends a crawl operation command signal to the oil field control device 10.

The hydraulic control device 10 is a hydraulic cylinder 1 of the finishing rolling mill 1.
Hydraulic control commands to 1 to 18 (system lines 33a to 33 in Figure 1)
d), but FIG. 2 shows only the hydraulic control command systems 33a and 33c on the working side.

Now, when the command operation amount of the upper work roll 3 via the hydraulic control command system 33c is larger than the detection amount detected by the position detection end 23, the upper work roll control servo valve 2
5 operates the hydraulic cylinder 14 and presses the upper roll chock 22 in the horizontal direction indicated by arrow Z by an amount corresponding to the amount of operation.

Conversely, if the commanded actuation amount is smaller, the upper work roll control servo valve 25 operates the hydraulic cylinder 13 to press the upper roll chock 22 in the opposite direction to the arrow Z.

Similarly, the actuation amount for the lower work roll 4 is determined by the lower work roll control servo valve 26 and the hydraulic cylinder 17.18.
configured via.

FIG. 3A shows the positional relationship of the upper work roll 3 and the lower work roll 4 with respect to the steel plate 8 when performing crown control with the apparatus of the present invention having the above configuration.

A hydraulic cylinder (not shown) moves the upper and lower work rolls 3,
4 chock support end P.

By pressing P/, the supporting ends P and P' move by an operating amount S1. Move in the horizontal direction by an amount corresponding to S2.

At this time, the control is performed so that Q is always 5l-82, and the operating direction in the horizontal direction is controlled to be opposite.

Therefore, the axes of the upper and lower work rolls at the supporting ends P and P' of the chock are ¥1. ¥2 is the axis Y of the upper and lower work rolls on the center line X in the direction of the female flower axis by a distance of S1 + 82-8
1. Y2 intersects.

That is, in the present invention, the axes of the upper and lower work rolls are configured to intersect at the axial center aQ, and the actuation amount S1. Inclination angle α1 corresponding to S2. This method focuses on the fact that a steel plate that can cure any crown can be obtained by adjusting α2.

It was previously known that a steel plate with a medium concave cross-sectional shape could be obtained by intersecting the axes of the upper and lower rolling rolls. There is only one example of manufacturing a steel plate, and a device like the present invention that can continuously control the crown while detecting the actual profile of the steel plate to achieve a predetermined crown is completely new. .

FIG. 4 is a diagram showing that a desired crown can be obtained by changing the distance between the axes of the upper and lower work rolls at the center of the chock (corresponding to S in FIG. 3 A), and this relationship is based on the diameter of the work roll. , width of steel plate, distance between chocks (
(corresponding to L in Figure 3A).

Now, next, a procedure for setting the operating amount of the upper and lower work rolls in the present invention will be explained.

Now, the operating amount of the upper work roll on the working side in any first stand of the multiple rolling stands arranged in tandem is Siuw, the operating amount of the upper work roll on the driving side is S i ud, and the lower work roll on the working side The operating amount of S
idw, the operating amount of the drive side lower work roll is 5idd
When, where, L: Distance between chocks (shown in Figure 3 A) αi:
Up, down, up and down - angle of inclination formed by the work roll line (α shown in Figure 3 A) Here, generally α1 (1, so the above equations (1) to (4)
becomes as follows.

Now, αl in the above equation is calculated based on the detection signal obtained from the profile detector 7, and can be obtained from the following equation if the deviation between the target crown value and the measured crown value is ΔC.

However, Kci: Stand gain W of i-stand:
Plate width di of steel plate: diameter of the upper and lower work rolls or more The operating amount of the upper and lower work rolls in the i-stand obtained from the formula is output to each hydraulic cylinder of the i-stand to perform crown control.

Note that the stand that executes the control is not limited to a specific stand, but any number of stands can be selected from a plurality of continuous steel plate rolling mills arranged in tandem, and the operating amount can be set to any number of stands. Of course, it may be tangential to an arbitrary ratio.

As described above in detail, the present invention can automatically and continuously perform crown control with a rolling equipment having a simple structure.
The improvements in quality, yield, and efficiency are remarkable, making it an industrially useful invention.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the configuration of the device of the present invention, Fig. 2 is a schematic diagram showing the side surface and operating mechanism of the rolling mill according to the device of the present invention, and Fig. 3 A shows the relationship between the work roll and the steel plate in the present invention. A schematic plan view, Figure 3, a schematic side view of Figure 3A, and Figure 4 are graphs showing the relationship between the amount of crown change and the distance between the upper and lower roll axes. 1... Finishing rolling mill, 2... Front rolling mill, 3, 3/... Upper work roll, 4, 4'-
- Lower work roll, 5, 5'... Upper back-up roll, 6, 6'... Lower back-up roll, 7... Profile detector, 8...・・・・・・
Steel plate, 9... Arithmetic control device, 10...
Hydraulic control device, 11-18.11'-18'...
・Hydraulic cylinder, 20, 20'... Backup roll chock, 21, 21'... Wind liner, 22, 22'... Work roll chock, 23.23'... ...Position detection end, 24...
.... Lowering device, 25.26 .... Upper and lower work roll control servo valves, 27 .... Hydraulic pump,
X... Center line in the width direction of the threading line, Y...
...Axes perpendicular to the sheet threading direction, α1゜α2...
Inclination angle, L... Distance between chocks.

Claims (1)

[Claims] 1. In a steel plate continuous rolling facility in which a rolling stand having a work roll and a backup roll is arranged in tandem, a profile detector consisting of a width direction scanning thickness gauge and a central fixed thickness gauge installed on the exit side of a finishing rolling mill; an arithmetic and control device that calculates the amount of change in the inclination angle of the work roll axis with respect to the sheet passing direction using the detection amount from the profile detector as an input signal and outputs a work roll operation command signal; 1. A continuous steel plate rolling facility comprising: a hydraulic control device for operating work rolls in any number of stands;