JPS63313608A - Centering device for warped strip - Google Patents

Abstract

PURPOSE:To correct meandering and to improve the quality, yield and operating rate by disposing centering rollers at upstream and downstream sides of tension bridle rolls 7 equipped between continuous strip treating apparatuses and providing a tension to the strip. CONSTITUTION:The centering rollers 5, 21 are disposed at the upstream and downstream sides of the tension bridles 7 to change the tension existing between facilities continuously treating the strip such as an upstream pickling facility 2 and a downstream cold tandem rolling facility 8, and the tension is applied to the strip 1. Through this application of tension, the tension change is leveled to correct the meandering of the strip 1. Therefore, the quality of the strip 1, yield and the operating rate of the installations are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a centering device that performs centering upstream of a device that is provided in a continuous strip processing line and that requires centering of a strip with precision. In particular, it relates to a centering device for strips with plate bends.

[Conventional technology]

In a continuous strip processing line, equipment that requires centering in order to correct the meandering of the strip includes, for example, a trimming device that cuts the edges of the strip;
There are cold tandem rolling mills that are connected to pickling equipment. Among these, the trimming device is required to have highly accurate centering in order to narrow the edge cutting margin in order to improve the material yield. Further, in cold tandem rolling equipment, rolling control such as work roll shifting is performed in order to modify the cross-sectional shape of the strip. If a centering failure occurs in the strips that are continuously supplied from upstream equipment (for example, pickling equipment), this failure will cause a disturbance and worsen the shape correction effect, so high accuracy is required in the centering of the supplied strips. has been done.

In response to these demands, conventional equipment has a strip meandering correction device (centering device) as described in Japanese Patent Publication No. 61-22655, which is installed upstream of a trimming device or cold tandem rolling equipment. .

An example of a conventional continuous processing line with such a conventional centering device is shown in Fig. 2.In recent years, it has become common to connect pickling equipment to cold tandem rolling equipment in order to improve efficiency. However, at the connection point, the meandering of the upstream pickling equipment was corrected, and
A centering device is required to guide the strip to the cold tandem rolling facility without shifting from side to side due to meandering. Furthermore, since the tension conditions for the strips in both pieces of equipment are different, a tension prydle (tension converter) is required at the connection between both pieces of equipment.

Therefore, in FIG. 2, the strip 1 is guided from a pickling facility 2 (details are omitted) to a centering roller 5 via deflector rollers 3 and 4. This centering roller 5 ensures that the strip 1 at the point of the detector 6
If it deviates to the left or right, it is immediately centered and guided to the tension priddle 7. A predetermined tension difference is generated by this tension prydle 7, and the product is advanced to a cold tandem rolling facility 8. For example, the tension on the pickling equipment side is 4.5 t.
For example, 2 on the cold tandem rolling equipment side.
It is 5t, which is high. After the strip 7 is cold rolled, it is wound onto a tension reel 9.

[Problem that the invention seeks to solve]

There are various reasons why strips meander, which requires centering, and some are interrelated and some involve multiple factors, but they can be summarized as follows: .

(1) The surface of the strip is uneven and warped, making it look like wakame seaweed, and as it gets caught in the rollers, it becomes meandering.

(2) There is an error in the installation level of devices such as rollers, and the rollers apply external force in the width direction to the slip, causing meandering.

This can be said to be due to static causes such as rollers.

(3) The roller is deflected by the load during operation, and this deflection applies an external force in the width direction to the strip, causing meandering.

This can be said to be due to the dynamic cause of the rollers.

(4) There are variations in the metal structure in the width direction of the strip, and the strip meanderes as it is bitten by the rollers.

(5) The strip has already been bent within the plane of the strip, and meandering occurs due to the bent state of the plate.

Although conventional devices have a function of correcting the meandering caused by the causes (1) to (4) above, they have a limited function of correcting the cause of board bending (5).

Next, the difference between plate bending and other types of meandering will be explained with reference to FIG. FIG. 3 shows an example of trimming a strip in a continuous processing line. Strip 1 is corrected for the meandering (detected by detector 6) that occurred upstream of strip 1 by centering roller 2. At the position of the trimming device 6, the trimming device 11 passes through the center of the line without shifting to the left or right and passes through the deflector roller 4.
He was guided to the hospital and had both ears 12 removed. In this state, when the strip 1 passes the position of the detector 6 with the sheet warping caused during hot rolling, the sheet bending is detected and the centering roller 5 performs a centering operation. Also, when the curved plate passes, a centering action is performed on the opposite side.

In this way, at the position of the detector 6, the strip passes through the center of the line without shifting to the left or right, but between the deflector roller 4 and the trimming device 11, the strip is first bent.
If it is in such a position, it can no longer be corrected using the centering device, and immediately after the rental condition, the ears become dislocated, causing a problem that makes it impossible to operate. If the strip is not bent, trimming can be performed satisfactorily with the arrangement of the centering rollers 5 as shown in FIG. 3, but trimming of a strip with a bend is extremely difficult.

On the other hand, in the case of other meanderings, after the centering operation is performed, the centering is immediately performed on the opposite side, and the meandering state remains between the lanterning device and the downstream device (trimming device 11 in the figure). This is not the case (the situation shown in Figure 3).

The plate bending is expressed by a bending pitch P and a plate bending amount ε. Generally, the maximum plate bending is considered to be about 20 m in P and about 20 cm in C. Since the amount of plate bending is small, it is possible to shorten the distance from the detector 6 to the trimming feed station 4, and by making the distance shorter, it is possible to reduce the influence of plate bending. However, since it is necessary to provide a free span (the part between the rollers) that is 2 to 3 times the maximum strip width on the exit side of the rental roller 5, the free span cannot be shortened, and for example, due to trimming conditions, it is not possible to shorten the free span. Centering correction accuracy that cannot be achieved is rarely achievable. This will be explained in more detail below.

In addition, those caused by (1) to (4) are referred to as "meandering," and those caused by (5) are referred to as "plate bending," separating the concept of plate bending from the concept of meandering. Continue explaining.

(1) Generally, the meandering amount of the strip upstream is 100~
There are 150 possibilities, and to correct this, the centering roller is swung by an amount commensurate with the amount of meandering. However, during this swing, in order to stably re-correct the strip, it is necessary to provide a free pan with a length approximately 2 to 3 times the maximum strip width before and after the swinging pass roller. However, plate bending occurs locally at approximately 20 strips per 20 m of strip length (J I
5-G-3193 steel plate horizontal bending (refer to the standard value for plate bending referred to in this application), and a long free span before and after the centering roller is used to prevent plate bending in centering equipment. In other words, even if a bend in the plate is detected and a centering operation is performed, as soon as the bend in the plate passes, the centering operation is performed in the opposite direction, and the bent part of the plate is transferred to downstream equipment. When it arrives, it will be in a state where it will not be centered.

(II) Also, the meandering amount detector is used for control stability.
It is placed directly behind and close to the centering roller that swings. In the detector section, the strip accurately travels along a predetermined course without deviating left or right from its travel line. The meandering caused by (1) to (4) above will not occur again if the strip passes through the tension bride located downstream of the detector section and is subjected to high tension. Since the curvature is not maintained even in the case of the detector, centering is required even after the detector. However, centering is no longer possible at all, and the amount of bending of the plate ends up causing the strip to meander at the position where centering is required.

As mentioned above, the maximum amount of plate bending is generally about 20 mm per 20 m of strip length, which occurs during upstream hot rolling. If this occurs as strip deviation, it will not be possible to satisfy the centering requirements of the trimming device or cold tandem rolling equipment.

As described above, the conventional technology does not take into consideration the centering of strips with a sheet warp, and does not include trimming devices that require high-precision centering, cold tandem rolling equipment that performs control to modify the cross-sectional shape of the strip, etc. However, there were some unsatisfied problems.

An object of the present invention is to solve the problems (1) and (n) above, and to provide an apparatus that can perform highly accurate centering of a strip having a curved plate, which could not be achieved using the prior art.

[Means for solving problems]

The invention is carried out in a continuous strip processing line in which two pieces of equipment are connected via a tension bride. In addition to the conventional centering roller for correcting the meandering of the strip, another centering roller is disposed between the tension bride and downstream equipment.

[Effect]

This other centering roller is disposed upstream from the position where centering is required and within a distance of at most the bending pitch of the plate bending, and therefore, the plate bending is captured and centered within a short free span, so that the plate bending is prevented. It is possible to perform centering that adequately corresponds to the Therefore, problem (1) can be solved.

In addition, since the centering roller is disposed downstream of the tension bride, among the meandering caused by (1) to (5) above, only the meandering caused by the bending of the plate (5) that can pass through the tension bride. Since the amount of plate bending is about 20 degrees, sufficient centering is possible even with a short free span. Therefore, problem (n) can be solved.

〔Example〕

An embodiment of the present invention will be described in FIG. 1.4.5.

In the continuous strip processing line of this embodiment, pickling equipment 2 and cold tandem rolling equipment 8 are connected via tension blinds 7, similar to the line shown in FIG. A high tension of 25 t is applied to the strip on the cold tandem rolling equipment 8 side, which is downstream equipment. A low tension of 4.5 t is applied to the strip on the pickling equipment 2 side, which is the upstream equipment.

It is necessary to center the strip on the entry side of the cold tandem rolling equipment, and a centering roller 21 for performing this centering is disposed upstream from the entry side position within a distance of the bending pitch of the plate bending. Immediately downstream of this centering 18, a detector 22 for detecting plate bending is provided. Since the amount of plate bending is smaller than other amounts of meandering, even in a short free span such as between the entrance side of a cold tandem rolling equipment and the centering roller,
Centering can be done.

A centering roller 5 is present between the tension bride 7 and the pickling equipment 2 as in the prior art.

A long free span is provided before and after the centering roller 5 for centering a generally large amount of meandering. A detector 6 for detecting meandering is provided immediately downstream of the centering roller 5.

The strip between the detector 6 and the cold tandem rolling facility 8 is subjected to high tension by the tension prydle 7, so meandering does not occur again, however.

The plate bending described above in FIG. 3 also exists as it is at the detector 22. The deviation due to this plate bending is corrected by the centering roller 21 to the accuracy required by the cold tandem rolling equipment 8.

According to FIGS. 4 and 5, the centering roller 5 of FIG.
, 21 and its vicinity will be described in detail below.

The upstream centering roller 5 is of a conventionally known swing roller type, and is a path roller 3 attached to a fixed frame 3o and a swing frame 31 via bearings.
2, and a hydraulic cylinder 33 for swinging the swing frame 31; 1, the hydraulic cylinder 33 is actuated via a well-known control device in response to a signal sent to the detector 6, and the strip 7 is shifted from side to side at the point of the detector 6; This is to make sure that it passes through the center. The centering amount δ (see Figure 5) is the generally considered meandering amount on the outlet side of the pickling equipment 100
It is constructed to cover a distance of ~150m.

Further, the centering roller 21 on the downstream side has almost the same configuration as the centering roller 5 on the upstream side, and the fixed frame 34. Swing frame 35° path roller 32. It consists of a hydraulic cylinder 36, which is actuated by a signal from the detector 22 via a well-known control device so that the strip 1 passes through the center at the point of the detector 22 without shifting to the left or right. It becomes. The centering amount (not shown) corresponding to the meandering correction amount δ in FIG. 5 is set to correspond to the generally considered amount of plate bending of the strip.

〔Effect of the invention〕

According to the present invention, it is possible to center a strip having a curved plate with high precision, which has been difficult in the past.

If the downstream equipment is a cold tandem rolling equipment,
Good shape modification of the strip cross section becomes possible. Also,
If the downstream equipment is a trimming equipment, it is possible to properly modify the shape of the strip cross section. Furthermore, if the downstream equipment is a trimming equipment, problems such as ear clipping can be prevented. Moreover, it has a great effect on improving the operating rate by 2 steps, high quality, etc.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an arrangement example in which the present invention is applied to FIG. 2, FIG. 2 is a layout diagram of a conventional example, FIG. Detailed layout of the present invention section in Figure 3, Figure 5 is v-■ in Figure 4.
Section 6, which is an arrow view: 1... Strip, 2... Pickling equipment (upstream equipment). 8. Cold tandem rolling equipment (downstream equipment), 9.
・Tension reel, 21...centering roller,
22...Detector.

Claims (1)

[Claims] 1. In a continuous strip processing line where two pieces of equipment are connected via a tension bridge and high tension is applied to the downstream piece of equipment, there is a line that is longer upstream than the position that requires centering of the downstream piece of equipment. A centering roller that performs centering corresponding to the amount of plate bending is provided within the distance of the bending pitch of the plate bending, and a centering roller that corrects the meandering of the slip further upstream of the tension bride located upstream of the centering roller. 1. A centering device for a strip having a bent plate, characterized in that a strip centering device is provided with a bent plate.