JPS59189012A - Device for controlling lateral deviation of rolling material - Google Patents

Abstract

PURPOSE:To correct the camber of a rolling material and to improve the quality and yield thereof by outputting left and right draft correcting signals obtained by calculating the meandering and laterally deviating quantities of the material and changing roll gaps at both sides basing on the signals. CONSTITUTION:When a rolling material 9 happens to meander; its deviating quantity is detected by a width-end detctor 17, and the meandering quantity is obtained by a meandering-quantity arithmetic device 19 to compare it with a target position signal 21 by a meander adjuster 22 thereby outputting a draft correcting signal 23. The piston displacement signals of hydraulic cylinders 7, 8 are compared with the draft correcting signals 23 by summing amplifiers 15, 16, and the quantities of pressurized oil inflowing and outflowing to/from the cylinders 7, 8 are controlled basing on the difference signal by servovalves 11, 12. The position of material 9 is monitored at the inlet and outlet sides of a mill 10; when the deviating quantity at the inlet side is less than a prescribed value and the deviation quantity at the outlet side is detected, relays 24, 25 are switched to input a draft correcting signal 30 to the amplifiers 15, 16 from a camber adjuster 29.

Description

DETAILED DESCRIPTION OF THE INVENTION Mokkomei relates to a device for controlling camber of rolled material.

In rolling operations, it is well known that, depending on the conditions during rolling, the rolled material cannot remain in the center of the roll and moves toward the ends of the roll as rolling progresses, as shown in Figure 1. It's called a meander.

Now, to explain the meandering of the rolled material, Fig. 1 shows a state where the rolled material a has shifted to the right side from the center of the work roll b for some reason, and in such a state, a large rolling force is It is biased to the right side of the rolling mill, and the roll gap becomes uneven between the left and right sides, and the gap on the right side is wider than the left side. By the way, although the circumferential speed of roll b is uniform on the left and right sides, the gap on the right side is wider, so the unit FR is
The volumetric flow rate of the rolled material per unit is larger on the right side. Also, if the thickness of the rolled material on the entry side is symmetrical, the material will be drawn in faster on the side with a larger volumetric flow rate. As a result, as shown in FIG. 2, the rolled material a meanderes to the right (!IIX), and camber<IJy) occurs on the exit side. Therefore, the difference between the left and right roll gaps becomes even larger, the meandering is promoted, and the camber becomes even larger.

Therefore, camber is closely related to meandering of the rolled material, and if meandering is eliminated, camber can be eliminated to some extent. However, in addition to the meandering of the rolled material, camber can also occur due to causes such as the material of the rolled material being asymmetrical, the material itself having camber, or a temperature difference between the left and right sides. Even if this problem is solved, it is not possible to completely eliminate the camber of the rolled material.

Until now, sufficient measures against camber have not been taken.
A rectangular thick plate of the required dimensions is obtained by rolling the plate in advance to a sufficiently large width and cutting off unnecessary parts, resulting in a significant decrease in yield.

The present invention was developed in view of these circumstances, and aims to improve the quality and yield of rolled material by controlling the left and right roll gaps to prevent meandering and correct camber.

The present invention will be described in detail below with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which a lower backup roll supporting both ends of upper and lower work rolls 1 and 2, upper and lower backup rolls 3 and 4, and lower back-up roll 4 is shown. In the rolling m10, which is equipped with hydraulic cylinders 1 and 8 that apply rolling blades to each roll chock 5 and 6 to roll a rolled material 9, the left and right hydraulic cylinders 7 and 8 are equipped with servo valves 11. A displacement detector 13.14 is attached to the hydraulic cylinder 7.8, which controls the amount of pressure oil flowing into and out of the cylinder tough 8 and detects the movement of the piston of the hydraulic cylinder 7.8. A summing amplifier 15.16 is connected to the servo valves 11, 12, which compares the signal from the displacement detector 13.74 with the output signal from the meander adjuster 22 or camber adjuster 29, which will be described briefly.

The left and right roll gaps are set by controlling the amount of pressure oil flowing into and out of the hydraulic cylinder 7.8 using servo valves 11.12, and fluctuations in the roll gap are controlled by the piston of the hydraulic cylinder 7.8. It is indirectly measured by displacement detectors 13.14 that detect movement, and compared with a set signal by addition amplifier 15.16. If there is a difference, the servo valves 11 and 12 are controlled using that difference.
: Make sure to correct it.

Furthermore, rolled material width end position detectors 17 and 18 are provided on the entry and exit sides of the rolling 1 and 10, respectively, and a signal from the width end position detector 17 on the entry side is input to the meandering amount calculation device 19, The meandering amount signal Ax calculated by the meandering amount calculation device 19 and the target position signal 21 from the rolled material position setting device 20 are input to the meandering adjuster 22. The meandering adjuster 22 processes the meandering interpolation @A do.

Further, the signal from the width end position detector 18 on the exit side is input to the deviation amount calculation device 26, and is outputted from the calculation device 26 as a deviation signal 27 to be used for camber calculation together with the meandering amount signal Ax from the meandering amount calculation device 22. input to device 28; The camber calculation device 28 calculates a camber signal 4y based on both signals and inputs it to the camber adjuster 29. The camber adjuster 29 processes the signal g and takes it out as a camber correction Masanobu @30. The signal is inputted to the summing amplifiers 15 and 16 via the A contacts of the relays 24 and 25.

In the above configuration, if the rolled material 9 is meandering, first eliminate the meandering and correct the camber caused by the meandering, and if camber still occurs even after the meandering is eliminated, correct the camber. Finely control the left and right roll gap.

The adjustment of the roll gap to correct the camber is slight, and the meandering that may occur due to this can be sufficiently controlled by the rolled material guide device currently installed in the rolling mill, and there is no problem.If the meandering becomes large, the camber Roll gap control for correction will transition to roll cap control for meandering control.

Next, a detailed explanation will be given with reference to FIG.

When the rolled material 9 meanderes, the amount of deviation is detected by the width end detector 17, and the meandering amount calculation device 19 calculates the meandering ffi,6X. are compared, and a positive pressure signal 23 is output. If the meandering suspension Ax is greater than a predetermined value, the relay 24
．． 25 is not activated, the reduction correction signal 23 is input as is to the addition amplifier 15.16, and the addition amplifier 15.16 further compares the actual piston displacement signal of the hydraulic cylinder 7.8 with the reduction correction signal 23. , the servo valves 11.12 control the amount of pressure oil flowing into and out of the hydraulic cylinder 7.8 according to the differential signal, and as a result, the left and right roll gaps are changed, and the rolled material 9 is set by the rolled material position setting device 20. The meandering is eliminated by returning to the target position.

The position of the rolled material 9 is monitored at the input and exit sides of rolling number 10, and if the amount of deviation on the entry side of the rolled material 9 is less than a predetermined value and the amount of deviation is detected on the exit side, This is a state in which camber has occurred due to a cause other than meandering, and at this time relay 24.
25 is switched, and the reduction correction signal 30 from the camber adjuster 29 is input to the summing amplifier 15.16. That is,
A camber signal ff1V is determined by a camber calculation device 28 based on the detection result from the width edge detector 18 and the meandering width @A×, and is further converted into a reduction correction signal 30 by a camber adjuster 29.

Therefore, in the same manner as described above, the hydraulic cylinder 7.8 is driven via the servo valve 11.42 based on the pin 1-n displacement signal and the reduction signal 30, and the left and right roll gaps are adjusted.

When the meandering exceeds a predetermined value due to camber correction, relay 2 is activated.
4.25 switches again and switches to meandering control.

In this way, the meandering can be suppressed within a practical range, the camber can be corrected, and a high-quality rolled material can be produced.

The above explanation is based on the case where camber is corrected with a focus on adjusting the roll gap, but as mentioned above, the cause of camber is the difference in the left and right speeds of the rolled material at the exit side of the roll gap (the advancement rate is Therefore, changing the roll gap is nothing but changing the speed distribution of the rolled material. Therefore, the means for changing the advance rate on the left and right sides of the rolled material is not limited to changing the roll gap, but also by changing the left and right tension distribution at the exit part of the rolled material or on the left and right sides of the work roll. Various methods can be used, such as changing the lubrication state.

Further, the width edge detector may be a contact type or a non-contact type as long as it can detect the width edge position of the rolled material. Furthermore, two sets of width edge detectors may be provided on the entry side or two sets on the exit side to determine the amount of deviation and lateral bending of the rolled material.

As described above, according to the present invention, the camber of the rolled material can be corrected, and the quality and yield can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing a state in which the rolled material has approached one end of the roll, FIG. 2 is a plan view thereof, and FIG. 3 is an embodiment of the apparatus of the present invention. 7.8 is a hydraulic cylinder, 9 is a rolled material, 10 is a rolling machine, 1
7. 18 is a width end position detector, 19 is a meandering amount calculation device, 2
8 is a camber calculation device, 29 is a camber adjuster, and 30 is a reduction correction signal.

Claims (1)

[Claims] 1) Two sets of detectors for detecting the deviation of the rolled material are installed near the rolling mill, and a device calculates the amount of meandering from the result detected by one of the detectors. It is equipped with a device that calculates the amount of lateral bending of the rolled material based on the detection results of the detector, and a device that processes the calculated meandering amount and the amount of lateral bending and outputs it as a horizontal reduction correction signal. A lateral bending control device for rolled material, characterized by being equipped with a device for changing the roll gap on the left and right sides of the machine.