JPS603909A - Equipment for correctingly controlling rolling reduction in rolling mill - Google Patents

Abstract

PURPOSE:To make the thickness and width of a rolling material at its outlet side constant by installing three means for detecting a horizontal work-roll pressing force, etc. and a sensor for rolling load, etc. and eliminating the variation of rolling load caused by the change of the horizontal force. CONSTITUTION:A titled equipment consists of a rolling reduction device 15 for generating a rolling down force by the change of a rolling-reduction driving body 10, a horizontal bending device 11, a rolling-reduction control device, detecting means 231-237 for detecting a pressing force to be provided to corresponding work rolls 3, 4 by said device 11 or the position of the direction of said pressing force, a load sensor 13, and a level control means 26. Said device 11 generates a bending by providing a force to the rolls 3, 4. Further, said rolling- reduction control device inputs a draft-position setting signal SR required for setting the position of body 10, and drives the device 15 so as to make the sheet thickness of a rolling material at its outlet side constant. Then an output of said means 26 is supplied to an inputting point of the signal SR to eliminate the change of rolling load.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rolling mill that applies horizontal pushing force to a work roll provided with rolling blades to cause bending, thereby controlling the shape of a rolled material while rolling it. More specifically, the present invention relates to a rolling correction control device that can cancel fluctuations in rolling load caused by the pushing force to an appropriate UI+1.

In recent years, in order to finely and accurately control the shape of rolled material in the width direction, efforts have been made to apply separate horizontal pushing forces distributed in the axial direction of the work sail to allow it to bend with a high degree of freedom. A rolling mill has been developed.

For example, Figures 7 and 2 are examples of this type of rolling mill! The schematic diagram shows the structure of a membrane rolling mill. In these figures, a work roll 3.4 and an intermediate roll 5 are provided between the pack-up rolls 1 and 2, each of which is a backup roll, indicated by the reference numeral 1.2. In this case, the lower work roll 4 (upper work roll 3''t'4) is formed to have a small diameter within an allowable range from the viewpoint of strength, and its +l$lf4 is on the downstream side of the rolling mill 6 in the rolling direction ( Further, the lower work roll 4 is offset from the upstream side by an appropriate distance.Furthermore, the lower work roll 4 has the presser roll 7 and the split roll 8 located approximately horizontally (actually) on the downstream side (or upstream side) in the sheet passing direction. The divided rolls 8 are arranged diagonally downward (K) sequentially on a straight line and in contact with each other.The divided rolls 8 have a KIN number (for example, 6) of roll portions 8-1 to 8-6 on the axis 8a thereof, which are approximately equal in number. Both ends of the shaft 8a and each roll portion 8-1 are arranged at intervals.
Each part I/c between ~8-6 is a hydraulic cylinder 9-1~9
A separate pushing force in the direction of the lower work rail 4 is applied by each rod of -7.

Further, the bank up roll 2 is moved in the vertical direction by a lowering hydraulic cylinder IOK.
This creates a vertical reduction blade between the work rolls 3 and 4.

Therefore, according to the rolling t@ having such a configuration, while the hydraulic cylinder IOK generates a vertical rolling blade between the work rolls 3.4, the hydraulic cylinders 9-1 to 9-
7 generates separate pushing forces on the roll parts 8-1 to 8-6, and these pushing forces cause the lower work roll 4 to bend freely in the horizontal direction. The roll gap between the upper and lower work rolls 3.4 can be freely changed depending on the components, and thereby the shape of the rolled material 6 can be controlled finely and accurately.

However, in the above-mentioned rolling mill, when the horizontal pushing force applied to the lower work roll 4 is changed, the rolling load changes accordingly, so the thickness of the exit side of the rolled material 6 changes. In this case, the fluctuation of the rolling load is shown by the solid line (A) in Fig. 3.
As shown in (b) and (c), the degree of influence of the horizontal pushing force on the rolling load increases as the rolling load increases.)
There was a tendency.

This invention was made in view of the above circumstances, and its purpose is to suppress the fluctuation in rolling load that occurs when the horizontal pushing force on the work roll changes, regardless of the magnitude of the rolling load. Another object of the present invention is to provide a reduction correction control device that can accurately cancel normal pressure.

Hereinafter, one embodiment of the reduction correction control device according to the present invention will be described in detail with reference to FIG.

The rolling mill A shown in FIG. The above configuration, in which the horizontal bending device 11 consisting of hydraulic cylinders 9-1 to 9-7 is provided, is the same as the configuration shown in FIGS. 7 and 2. Further, a load 11f sensor 13 for detecting the rolling load PR is provided between the chock 12 of the upper bank up roll 1 in this rolling mill AK and the mill housing (not shown). Further, a piston 16 of a lowering hydraulic cylinder 10 (rolling unit R) is connected to the chock 14 of the lower back unroll 2, and the pressure of this hydraulic cylinder IOK is adjusted by a servo valve 17. Pressure oil is supplied. Further, the piston 1
The vertical position R8 of 6 is to be detected by the Magnescale 18. Further, the thickness of the sheet at the exit side of the rolling plate 6 is detected by a thickness gauge 19.

Then, the signals indicating the rolling load PR%, the position S of the piston 16, and the exit side plate thickness are input to the control circuit 20, while the output signal of this control circuit 20 is input to the adder 21.
is input to the subtraction input terminal of Also, this adder 2
1 is connected to one of the addition input terminals via an input terminal 22, and a pressure lower JET for setting the position S of the piston 16 is connected
A setting signal SR is supplied. And this adder 2
The opening and closing of the servo valve 17 is controlled by the output signal No. 1. In this case, the load sensor 1
3, Magnescale 18, thickness i+ 19, control t(1
The circuit 20, the HR nose 211, and the servo valve 17 constitute a rolling control device that maintains the thickness of the exit side of the rolled material 6 at a desired constant value. That is, the control circuit 2o includes a position control circuit 20a and a Mill constant control circuit 20b.
0a is based on the signal indicating the position S of the piston 16,
The position S of the piston 16 is determined by the reduction position setting signal SR supplied to the terminal 22 (this signal has a polarity such that it increases when the piston 16 is moved in the direction of widening the roll gap of the work rail 3 * 4 nIj). ) is the same as the position shown. In addition, the mill constant control circuit 20b and the MS rolling load PR of the piston 16 are
1. The position S of the piston 16 is changed based on the signals each indicating the outlet side plate thickness and the Mill constant of this pressure IWlA,
This acts to keep the thickness of the exit side plate constant.

On the other hand, a pressure sensor (or a pressure sensor for detecting the hydraulic pressure P-1 to P-7 applied to each of the hydraulic cylinders 9-1 to 9-1) (or
−7 position sensor for detecting the position of each piston)
23-1 to 23-7 are provided respectively. The outputs of these pressure sensors 23-1 to 23-7 are respectively amplified by weighted amplifiers 24-1 to 24-7, and then summed by an adder 255.
In this case, each of the amplifiers 24-1 to 24-7? ! For example, the amplifiers 24 corresponding to both ends of the roll 80
-,. The one with 24-7 is the lowest. The output of the adder 25 is then fed to the variable gain amplifier 26 (
level adjustment means). The output of the load sensor 13 is supplied to the control terminal of the variable gain amplifier 26, so that the variable gain amplifier 26 has a gain corresponding to the rolling load PRK, that is, the larger the rolling load PR is, the larger the gain is. , amplify the output of the adder 25. The output of the variable gain amplifier 26 is input to the other addition input terminal of the adder 21.

Therefore, according to this embodiment, when each pushing force of the hydraulic cylinders 9-, to 9-7 is changed in order to control the shape of the rolled material 6, the overall horizontal pushing force on the work roll 4 changes. , Even if the rolling load PR changes due to this, the piston 16 is controlled by the work rolls 3.4 to widen the roll gap between the work rolls 3.4 so as to cancel out the change in the rolling load PRf), and on the other hand,
When the horizontal pushing force decreases, the amount of protrusion of the four-way cross member 26 decreases, and thereby the piston 16 is controlled to narrow the roll gap. Furthermore, according to this embodiment, since the control gain in the correction control as described above changes depending on the rolling load, the magnitude of the rolling load is different.As a result, the influence of the horizontal pushing force on the rolling load is reduced. Even if the pressure is different, an appropriate reduction correction is always made. That is, when the rolling load PR is large, the gain of the variable gain amplifier 26 is increased and a large correction is made, while when the rolling load PR is small, the gain of the variable gain amplifier 26 is reduced and a small correction is made. .

In addition, although the above-mentioned embodiment is shown for a rolling mill AK in which the horizontal bending device 11 is provided on the downstream side in the sheet passing direction with respect to the lower work roll 4, the present invention is applicable to a rolling mill AK in which the horizontal bending device 11 is For rolling mills provided for either or both of the upper and lower work rolls, or for rolling mills provided with a horizontal bending device on either the upstream or downstream side in the threading direction with respect to the work rolls. may also be applied. Furthermore, as a method of obtaining a more appropriate control gain, it is also useful to perform corrections based on the diameters of the upper and lower work rolls, the diameter of the intermediate roll, the thickness of the strip, and the plate rlJ.

As is clear from the above description, the rolling reduction correction control device according to the present invention has a detection means for detecting the position of the work roll in the horizontal pushing force direction, and a rolling load. A load sensor for detecting the load sensor and a level adjustment means for adjusting the output signal of the detection means according to the output of the load sensor are provided. Since the data is input to the input point, when controlling the shape of a rolled material by bending the work roll by horizontal pushing force, the variation in rolling load caused by changes in this horizontal pushing force can be avoided. can be almost completely canceled out regardless of the magnitude of the rolling load.

[Brief explanation of the drawing]

Figures 9 and 2 show pressure! with a horizontal benzo ink device! /JE 4rs This shows the outline of an example of the 7th
Figure 2 is a side view, Figure 2 is a view taken in the direction of the arrows in Figure 1, Figure 3 is a characteristic diagram showing the effect of horizontal pushing force on rolling load, and Figure 2 shows the formation of an embodiment of the present invention. It is a block diagram. 3...Upper work roll, 4...Lower work roll, 6...Rolled material, 11...
・Horizontal bending device, 13... Load sensor, 20... Control circuit, 21... Adder, za-1 to 23-7... Pressure sensor , 25・
... Adder, 26 ... Variable gain amplifier (
level adjustment means). Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 1 Figure 2 Figure 1 a -Ar%- Horizontal (A17) 8

Claims (1)

[Claims] Rolling # A rolling device that generates rolling blades in the vertical direction of both work rolls by displacement of a moving body, and bending by applying a pushing force substantially parallel to the sheet threading direction to at least one of the two work rolls. a horizontal bending device that generates a horizontal bending device; and a rolling control device that inputs a rolling position setting signal for setting the position of the rolling member and drives the rolling device so that the exit side thickness of the rolled material is constant. A rolling mill comprising: a detection means for detecting a pushing force applied to a corresponding work roll by the horizontal bending device or a position of the work roll in the direction of the pushing force; and a detecting means for detecting a rolling load. A load sensor that
level adjustment means for adjusting the signal level of the output of the detection means in accordance with the output of the load sensor, and the output of the level adjustment means is inputted to the input point of the roll-down position setting in the roll-down control device. A rolling correction control device GL characterized in that it cancels changes in rolling load caused by pressing force.