JPH03118917A - Method for controlling side guide of down coiler - Google Patents

Abstract

PURPOSE:To improve coiling shape and maintenance property by closing a disk roller and opening a liner plate when a strip coiling is started and reversing the closing and opening when a strip bottom part passes through the final stand. CONSTITUTION:When the coiling of strip 13 is started, a cylinder unit 6 is controlled, the opening of a side guide body 5 is set to a specified value, the disk roller 7 guides the strip 13 to give a command to a cylinder unit 9 and the liner plate 10 is set to a wide opening. When the bottom of the strip 13 passes through the final stand 1 of a finishing rolling mill, a detector 12 outputs a signal to a controller 11, the liner plate 10 is closed to guide the strip 13 and to open the disk roller 7. Coil edges are uniform and trimmed, the coiling shape is made excellent, maintenance property of the side guide can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a side guide device that is installed in front of a down coiler of a hot strip mill and guides the strip. The present invention relates to a side guide control method that improves maintainability, prevents edge irregularities, and improves roll appearance by setting the operating timing of rollers and liner plates based on a final finishing mill.

Conventional technology As is well known, the side guide device in front of the pinch roll in the down coiler of a hot strip mill is installed for the purpose of centering the strip.

has been done.

Conventionally, there are two typical types of side guide devices: a disk roller type and a plate liner type. The disc roller model is a method in which the strip is guided by multiple disc rollers attached to the side guide body (
The plate liner type is a type in which the strip is guided by a cylinder-driven plate liner installed independently on the side guide body.

However, the above two types of side guide devices have several problems.

A disc roller type side guide device has low roller wear and is excellent in terms of maintenance, but it also requires sufficient pack tension to be applied to the strip from the time the bottom of the strip passes through the final stand of the finishing mill. There is a problem that sagging of the strip and uneven edges are likely to occur.

On the other hand, in the case of the plate liner type side guide device, due to its structural characteristics, it is possible to apply sufficient pack tension even after the bottom of the strip passes through the final stand of the finishing mill. Although there is almost no occurrence of sagging or uneven edges, the amount of wear on the plate liner is large, and the plate liner needs to be replaced every 100 to 200 coils, which poses a problem in maintainability.

Problems to be Solved by the Invention As mentioned above, the typical disc roller type and plate liner type side guide devices have problems with sagging strips and uneven edges due to the inability to control the pack tension. , there is a maintenance problem due to wear of the plate liner.

In order to solve these problems, the present invention proposes a control method that uses both the disc roller type and plate liner type side guide devices in combination so that only the advantages of each can be utilized.

Means for Solving the Problems The present invention uses a side guide device that integrates a disc roller type and a plate liner type, and uses a side guide device that integrates a disc roller type and a plate liner type. By using a control system that uses disc rollers as side guides and switches to plate liners once the strip bottom passes through the final stand of the finishing mill, we prevent sagging and uneven edges of the strip and improve maintainability. It is something.

That is, the gist of this invention is a method of controlling a side guide device equipped with a disc roller and a liner plate, in which the disc roller is closed and the liner plate is opened when starting to wind the strip, and the bottom part of the strip is finished. This is a method in which the disc rollers are opened and the liner plate is closed when the product passes through the final stand of the rolling mill.

The side guide device equipped with disc rollers and liner plates has multiple disc rollers and a liner plate with an opening adjustment mechanism for cylinders, etc. attached to the side guide body with an opening adjustment mechanism for cylinders, etc., and can be opened and closed respectively. It is designed to be remotely operated by a control device.

When winding the strip onto the down coiler, the disc roller is closed and the liner plate is opened.
The strip is guided by disc rollers and wound around a down coiler without contacting the liner plate.

There are various methods for detecting passage of the final stand of the finishing mill for the strip bottom portion, and usually a method using a change in rolling load, a change in tension between stands, or a method using a passage detector is used.

When the liner plate closes and the disc rollers open at the same time as the strip bottom portion passes through the final stand of the finishing mill, the strip is guided only by the liner plate, and pack tension is applied to the strip.

Embodiment FIG. 1 is a schematic diagram showing an example of the configuration of an apparatus for carrying out the method of this invention, (1) is the final stand of a finishing mill, (
2) is a side guide device, and (3) is a pinch roll in front of the down coiler.

Side guide device (20), cylinder unit (6)
The side guide body (5) whose opening degree is adjusted by
) A plurality of liner plates (10) are mounted, which are driven by a motor.

(11) is an opening/closing control device for the side guide device (2), which inputs the detection signal of the strip passage detector (12) installed on the exit side of the final stand of the finishing rolling mill (1), and at the same time inputs the detection signal from the side guide main body ( 5) Cylinder unit
(6) and outputs an open command to the cylinder unit (9) of the liner plate (10).

In the above device, when winding the strip, the cylinder unit (6) is controlled by the opening/closing control device (11) according to the width of the strip to set the opening degree of the side guide body (5), and the opening degree of the side guide body (5) is set. An opening command is sent to the cylinder unit (9) of the brake (10), and the liner plate is set to an opening wider than the width of the strip.

Therefore, the strip (13) leaving the final stand (1) of the finishing mill is guided by the disc rollers (7) of the side guide device (2), led to the down coiler, and wound onto the mandrel.

At this time, the liner plate (10) is not in contact with the strip, so it does not wear out due to friction with the strip.

After that, when the bottom of the strip (13) passes through the final stand (1) of the finishing mill, the strip passing detector (
12) outputs the passage detection signal to the opening/closing control device (11), and an opening command is sent to the cylinder unit (6) of the side guide body (5), and at the same time the side guide body (5) opens, the liner plate ( A closing command is sent to the cylinder unit (9) of the liner plate (10).
10) is closed.

This causes the disc roller (7) to strip.

(13) and at the same time the guide action is released, the strip (13) is guided by the liner plate (10). At this time, since pack tension is applied to the strip, there will be no loose winding or uneven edges at the bottom of the coil.

The side guide body (5) returns to its original state when the bottom of the strip passes through the pinch roll (3).

Further, the liner brake (10) is moved back (opened) and returned to its original position when the down coiler mandrel is loaded off.

Note that the timing of loading and unloading the liner plate (10) is variable depending on the thickness and momentum of the strip, and the timing is optimized based on the following formula.

t=f(T, v) However, t is the time (seconds) from exiting the finishing mill to closing the liner plate, T is the plate thickness, and ■ is the momentum (
m/min).

Next, the results obtained when this invention is applied to an actual machine will be described below in comparison with the case where a conventional side guide device is used.

First, when 100 coils were wound using a liner plate type side guide device, there was no sagging of the strip bottom, no irregular edges of the coils, or loose winding, but the plate itself was worn 5 to 6 mm.

Furthermore, when a disc roller type side guide device was used, the wear of the rollers was minimal at around 11,001 tons for a total of 100 coils.
Because insufficient pack tension was applied, sagging of the strip bottom occurred in 10 coils, and 21 coils had uneven edges and loose winding.

On the other hand, when we applied the method of this invention using both the disc roller type and the liner plate type, we were able to completely eliminate the sagging of the strip bottom, uneven edges of the coil, and loose winding, and the amount of wear of both the disc roller and liner plate was 100~ The thickness could be suppressed to 150 μm.

As described in detail, the method of the invention makes it possible to take advantage of only the advantages of both the disc roller type side guide and the liner plate type side guide, thereby reducing the slack in the strip after leaving the final stand of the finishing mill. , it is possible to completely eliminate uneven coil edges and loose windings,
This has the great effect of providing a good coil winding appearance and significantly reducing wear on the disc rollers and liner plates, thereby improving maintainability.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of an apparatus for carrying out the method of this invention. 1... Finishing mill final stand 2... Side guide device 3... Down coiler 7... Disc roller 10... Liner plate 11... Opening/closing control device 12... Strip passage detector 13 ···strip

Claims (1)

[Claims] A method for controlling a side guide device including a guide body with an opening adjustment mechanism, a plurality of disc rollers, and a liner plate with an opening adjustment mechanism, wherein the opening/closing control device for the disc rollers and liner plate starts strip winding. A side guide control method for a down coiler, characterized in that the disc rollers are closed and the liner plate is opened, and when the strip bottom portion passes through the final stand of the finishing mill, the disc rollers are opened and the liner plate is closed. .