JPH0749125B2 - Continuous strip processing line - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a centering device for centering upstream of a device that requires centering of a strip of the precision provided in a continuous strip processing line, In particular, it relates to a strip centering device having plate bending.

[Conventional technology]

In a continuous strip processing line, a device requiring centering to correct the meandering of the strip includes, for example, a trimming device for trimming the strip, a rolling mill for a cold tandem rolling facility that is continuous with a pickling facility. Etc. Among them, the trimming device is required to have high-accuracy centering in order to narrow the edge cutting margin in order to improve the material yield. Further, in the cold tandem rolling facility, rolling control such as work roll shift is performed in order to correct the cross-sectional shape of the strip. If a stripping centering defect that is continuously supplied from an upstream facility (for example, pickling facility) occurs, the defect causes disturbance and deteriorates the shape correction effect. Therefore, high accuracy is required for the centering of the supplied strip. Has been done.

In order to meet these demands, the conventional device is, for example, Japanese Patent Publication No.
A strip meandering correction device (centering device) as described in 61-22655 is arranged upstream of a trimming device and a cold tandem rolling mill.

FIG. 2 shows a conventional example of a continuous processing line having such a conventional centering device. In recent years, it has been attempted to improve efficiency by connecting the pickling equipment to the cold tandem rolling equipment all at once, but at the connection part, the meandering of the pickling equipment, which is the upstream equipment, was corrected. Then
The stripping must be guided to the cold tandem rolling facility without shifting to the left or right due to meandering, and a centering device is required. Further, since tension conditions of the strip are different between the two equipments, a tension bridle (tension transducer) is required at the connecting portion of both equipments. Therefore, in FIG. 2, the strip 1 is a pickling facility 2 (details are omitted).
Thus, it is guided to the centering roller 5 via the deflector rollers 3 and 4. By this centering roller 5, if the strip 1 is displaced left and right at the point of the detector 6, it is immediately centered and guided to the tension bridle 7. A predetermined tension difference is generated by the tension bridle 7, and the process proceeds to the cold tandem rolling facility 8. The tension is as low as 4.5 t on the pickling equipment side, and is high at 25 t on the cold tandem rolling equipment side. The strip 1 is wound around the tension reel 9 after the cold rolling is completed.

[Problems to be solved by the invention]

There are various causes of strip meandering that require centering, and they are related to each other, and some of them include multiple factors. The outlines are as follows. .

(1) The strip's plate surface is distorted in an uneven shape, so to speak, it is a seaweed-like seaweed, and meanders while being bitten by the roller.

(2) There is an error in the installation level of the device such as the roller, and the roller or the like applies an external force in the width direction to the strip, causing meandering. It can be said that it is due to a static cause such as rollers.

(3) The roller is deflected by a load during operation, and this deflection gives an external force in the width direction to the strip to cause meandering. It can be said that it is due to the dynamic cause of the roller.

(4) There are variations in the metal structure in the width direction of the strip, and the strips meander while being bitten by the rollers.

(5) The strip is already bent in the strip plate surface, and meandering occurs due to the bent state of the strip.

The conventional device has a function of correcting the meandering caused by the above (1) to (4), but has a small function of correcting the cause of the plate bending in (5).

Next, the difference in plate bending from other meanders will be described with reference to FIG. FIG. 3 shows an example of strip trimming in a continuous processing line. The strip 1 corrects the meandering of the strip 1 (detected by the detector 6) generated upstream by the centering roller 5, and passes the deflector roller 4 through the center of the line at the position of the detector 6 without shifting to the left or right. The two ears 12 are cut off by being guided to the trimming device 11 via the. In this state, when the strip 1 passes the position of the detector 6 with the plate bending generated during hot rolling, the centering operation is performed by the centering roller 5 in which the plate bending is detected. Further, when the bent portion of the plate passes by, centering operation is performed on the opposite side. Thus, at the position of the detector 6, the strip passes through the center of the line without shifting to the left or right, but if the plate bending reaches the position as shown in the figure between the deflector roller 4 and the trimming device 11, it will no longer be present. It cannot be corrected by the centering device, and immediately after the state shown in the figure, the ear becomes dislocated and the operation becomes impossible. If there is no plate bending, trimming can be satisfactorily performed by disposing the centering roller 5 as shown in FIG. 3, but trimming of a strip having plate bending becomes extremely difficult. On the other hand, in the case of other meandering, the state of meandering immediately after performing the centering operation and centering on the opposite side directly enters between the centering device and the downstream device (trimming device 11 in the figure). There is no such thing (state of FIG. 3). Plate bending is bending pitch P
And the plate bending amount ε. Generally, the maximum plate bending is considered to be P of about 20 m and ε of about 20 mm. Since the amount of plate bending is small, the distance from the detector 6 to the trimming device 11 can be shortened, and if it is short, the influence of plate bending can be reduced. However, since it is necessary to provide a free span (a portion between the rollers) that is 2 to 3 times the maximum strip width on the exit side of the centering roller 5, the free span cannot be shortened and, for example, the centering which cannot be requested depending on the trimming conditions. Correction accuracy is almost unattainable. The details will be described below. In addition, what is caused by (1) to (4) is "meandering"
The term "plate bending" is caused by (5), and the concept of plate bending is separated from the concept of meandering to continue the explanation.

(I) Generally, the amount of strip meandering in the upstream is 100 to 150.
mm is considered, and to correct this, the centering roller is swung by an amount commensurate with this meandering amount.
However, it is necessary to provide free pans having a length of about 2 to 3 times the maximum strip width in front of and behind the path roller to be swung in order to perform a stable correction during this swing. However, the plate bending is locally caused by about 20 mm per 20 m of strip length (refer to JIS-G-3193 steel plate lateral bending (referred to as plate bending in the present application) standard value). However, an apparatus that performs centering by providing a long free span before and after the centering roller cannot sufficiently perform centering in response to plate bending.
That is, even if the plate bending is detected and the centering operation is performed, as soon as the plate bending passes, the centering operation is performed to the opposite side, and when the plate bending portion arrives at the downstream device, the centering is not performed. Will end up.

(II) Further, the meandering amount detector is placed immediately after the centering roller to be swung for stability of control. Then, in the detector section, the strip travels accurately on a predetermined course without shifting from the travel line to the left or right. The meandering caused by the above (1) to (4) does not occur again when a high tension is passed through the tension bridle located downstream of the detector section. However, a strip having a plate bend does not correct the bend even with a high tension, so that centering is required even after the detector. However, centering is no longer possible, and the amount of plate bending leads to strip meandering at the position where centering is required.

As described above, the maximum amount of strip bending is generally about 20 mm per 20 m of strip length, which was generated during hot rolling upstream, but at the position where centering is required due to this strip bending. , If it occurs as a strip deviation,
The centering requirements of the trimming device and the cold tandem rolling equipment cannot be satisfied.

As described above, the prior art does not consider the centering of the strip having the strip bending, and is used in the cold tandem rolling equipment for performing the trimming device and the strip cross-sectional shape correction control that require high-precision centering. , I was not satisfied.

An object of the present invention is to solve the problems (I) and (II) described above and to provide an apparatus capable of performing highly accurate centering of a strip having a plate bending which is not possible with the conventional technique.

[Means for solving problems]

In order to achieve the above object, the present invention connects the upstream side equipment and the downstream side equipment through a tension bridle, and in the continuous processing line of the strip for applying a tension to the downstream side equipment, the centering of the downstream side equipment is performed. On the upstream side of the required position and on the downstream side of the tension bridle,
A first centering roller of a swing roller type that includes a pair of rollers and that is capable of being inclined with respect to the traveling direction of a strip parallel to a plane including each axis of the rollers is provided. A second centering roller is provided on the upstream side of the tension bridle, and a pair of rollers for correcting the meandering of the strip is provided.

[Action]

This other centering roller is arranged upstream of the position where centering is required, within the distance of the bending pitch of the plate bending at the longest, and therefore the center bending is performed within the short free span to perform centering. It is possible to perform centering sufficiently corresponding to. Therefore, the problem (I) can be solved.

Further, since the centering roller is arranged downstream of the tension bridle, the plate bending of (5) which can pass through the tension bridle in the meandering caused by the above (1) to (5) is caused. Only the thing needs to be centered, and the plate bending amount is about 20 mm,
Full centering is possible even with a short free span. Therefore, the problem (II) can be solved.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. The pickling equipment 2 and the cold tandem rolling equipment 8 are connected through a tension bridle 7 to the continuous strip processing line of this embodiment, as in the line of FIG. A high tension of 25t is applied to the strip on the cold tandem rolling mill 8 side, which is the downstream facility. Pickling facility 2 which is an upstream facility
The strip on the side is given a low tension of 4.5t.

On the entrance side of the cold tandem rolling mill, it is necessary to center the strip, and a centering roller 21 for performing this centering is arranged within the distance of the bending pitch of the plate bending upstream from the entrance side position. A detector 22 for detecting plate bending is provided immediately downstream of the centering roller 21. Since the sheet bending amount is smaller than other meandering amounts, centering can be performed even in such a short free span between the cold tandem rolling mill entrance side and the centering roller.

A centering roller 5 exists between the tension bridle 7 and the pickling equipment 2 as in the conventional case. Before and after the centering roller 5, a long free span for centering a meander having a large amount of meandering is provided. A detector 6 for detecting the meandering is provided immediately downstream of the centering roller 5. Detector 6
To the cold tandem rolling mill 8 is
Due to the high tension exerted by the tension bridle 7, the meandering does not occur again. However, the plate bending described with reference to FIG. 3 described above still exists at the detector 22. The deviation due to the plate bending is corrected by the centering roller 21 to the accuracy required by the cold tandem rolling mill 8.

According to FIGS. 4 and 5, the centering roller 5 of FIG.
A detailed description of the area around 21 is given below.

The upstream centering roller 5 is of a conventionally known swing roller type, and includes a pass roller 32 attached to the fixed frame 30 and the swing frame 31 via bearings, and a hydraulic cylinder 33 that causes the swing frame 31 to swing. The signal from the device 6 is used to operate the hydraulic cylinder 33 via a well-known control device so that the strip 7 passes through the center of the detector 6 without shifting to the left or right. The centering amount δ (see FIG. 5) is configured to cover a generally considered meandering amount of 100 to 150 mm on the pickling equipment side.

Further, the downstream centering roller 21 has substantially the same configuration as the upstream centering roller 5,
34, swing frame 35, pass roller 32, hydraulic cylinder 36
The signal from the detector 22 activates the hydraulic cylinder 36 via a well-known control device so that the strip 1 passes through the center of the detector 22 without shifting to the left or right. There is. The centering amount (not shown) corresponding to the meandering correction amount δ in FIG. 5 is set in consideration of the generally considered strip bending amount.

〔The invention's effect〕

According to the present invention, centering of a strip having a plate bending, which has been difficult in the past, can be performed with high accuracy. When the downstream facility is a cold tandem rolling facility, it is possible to satisfactorily correct the strip cross section. Further, in the case where the downstream equipment is trimming equipment, it is possible to prevent a defect such as edge cutting. Then, it has a great effect on the operation rate, improvement of yield, high quality and the like.

[Brief description of drawings]

FIG. 1 is a view showing an arrangement example to which the present invention is applied in FIG. 2, FIG. 2 is a layout view of a conventional example, FIG. FIG. 1 is a detailed layout drawing of the present invention section, and FIG. 5 is VV of FIG.
FIG. 1 ... Strip, 2 ... Pickling equipment (upstream equipment),
3, 4 …… Deflector roller, 5 …… Centering roller, 6 …… Detector, 7 …… Tension bridle, 8…
… Cold tandem rolling equipment (downstream equipment), 9 …… tension reel, 21 …… centering roller, 22 …… detector.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Ishioka, No. 1 Kokanmachi, Fukuyama City, Hiroshima Prefecture, Japan Fukuyama Steel Works, Nippon Steel Pipe Co., Ltd. In-house (72) Inventor Tomoya Izushi 1st steel pipe town, Fukuyama City, Hiroshima Prefecture Nippon Steel Pipe Co., Ltd. Fukuyama Steel Works

Claims (3)

[Claims] 1. A continuous strip processing line for connecting upstream equipment and downstream equipment via a tension bridle to apply tension to the downstream equipment, in which the upstream equipment is located upstream of a position requiring centering of the downstream equipment. In addition, the first swing roller system is provided with a pair of rollers on the downstream side of the tension bridle, and is capable of inclining to the left and right with respect to the traveling direction of the strip parallel to the plane including the axes of the rollers. A continuous strip processing line comprising a centering roller and a second centering roller provided on the upstream side of the tension bridle so as to correct the meandering of the strip. 2. The continuous strip processing line according to claim 1, wherein the upstream equipment is pickling equipment. 3. The continuous strip processing line according to claim 1, wherein the downstream facility is a cold tandem rolling facility.