JPS60111713A - Guiding device at inlet side of rolling mill - Google Patents

Abstract

PURPOSE:To bite a strip tightly and to prevent its meandering surely by providing a bridle-roll unit capable of moving parallelly to the axis of rolling roll, to the inlet side of a biting device having a pair of pads capable of advancing and retreating in the direction of a rolling pass. CONSTITUTION:A biting device 10 having a pair of pads 16, 20 capable of holding and releasing a strip 6 and advancing and retreating in the direction of rolling pass, is arranged closely to work rolls 2, 3, and a bridle-roll device 22 having rolls 29, 30 capable of moving parallely to the roll axis of a rolling mill 1 is arranged at the inlet side of the device 10. In guiding the strip 6 to the mill 1, the strip 6 held between the pads 16, 20 is forcibly fed to bite its front tip between the rolls 2, 3 and a back tension is given to the strip 6 by the rolls 29, 30 at the same time, to perform a meander-preventing control. In this way, the strip is prevented from generating surface flaw, and the meander controlling is surely performed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an entry-side guide device in a rolling mill, and is particularly suitable for guiding strips in a continuous or batch-type cold rolling mill, such as a cold tandem mill. The present invention relates to an entrance guide device in a rolling mill.

[Background of the invention]

It is well known that in recent years, in the field of thin plate rolling using cold tandem mills, there has been a trend toward smaller diameter work rolls due to demands for improved rolling capacity. In this case, since the bite angle of the work roll becomes large, it is necessary to force the tip of the strip to bite into the work roll. In addition, the biting strip is applied with a certain tension (so-called pack tension) on the entry side.
It is also desirable to be able to perform rolling smoothly.

Conventionally, a biting device having a band made of a piece of wood that can hold an IJ tube and move in the pass direction is provided on the entry side of a rolling mill, and this biting device grips the tip of one tube, A method has been proposed in which the tip of the clamped strip is forcibly bitten into the work rolls, and the strip is maintained in a clamped state by the pads, thereby applying pack tension during rolling. However, in this type of entrance guide device, since the strip is continuously held between the pads, there are problems such as surface flaws on the strip and the need to frequently replace the wooden pad. As seen in No. 46-31724, it has been considered to use a clamping conveyor instead of the strip clamping pad. However, such a conveyor type has a problem in that it is difficult to obtain strong pack tension because the strip is held between belts.

On the other hand, as a means for applying bank tension, it is known to arrange a bridle roller device having a plurality of bridle rollers on the entrance side of a rolling mill, as shown in, for example, Japanese Utility Model Application No. 51-22939. However, when providing a bridle roller device like this, conventionally the roller unit is placed close to the rolling mill, so it is not possible to adopt a configuration for moving the roll in the axial direction with a large-scale Hiko roll guide device. The only way to prevent the strip from meandering is to vary the bridle roller angle. For this reason, there was a problem in that the control operation for preventing meandering could not be performed quickly, and the effect of correcting the conveying direction of the strip was poor. Even if it is possible to move the bridle roller axially close to the rolling mill in this way, the work rolls of the rolling mill have a strong clamping action on the strip, so the bridle roller cannot be moved axially at the close position.・Even if it is moved, a sufficient meandering prevention effect cannot be obtained.

[Purpose of the invention]

The present invention has been developed in view of the above circumstances, and is an introduction method for a rolling mill that can prevent the occurrence of surface flaws on the strip, reduce the frequency of parts replacement, and reliably control meandering. The purpose is to provide a side guide device.

[Summary of the invention]

The entry side guide device for a rolling mill according to the present invention includes a biting device that forces the rolling mill to bite the tip of the strip, and a bridle roller device that applies tension to the biting IJ tab. , the biting device has a pair of pads that are capable of holding and opening the IJ knob and both move forward and backward in the rolling mill path direction, and are disposed near the rolling mill;
On the other hand, the bridle roller device has a roller unit that can move in a direction parallel to the axis of the rolling mill roller and is arranged on the entry side of the biting device.

If the biting device and the bridle roller device are arranged in sequence toward the entrance side of the rolling mill in this way,
Of course, it is possible to both force the tip of the IJ knob into the rolling machine with a biting device and apply back tension to the strip after biting with a bridle roller device. By leaving the pad of the biting device in the strip open state after biting, it is possible to prevent surface scratches on the strip, and the material of the pad can be made of highly wear-resistant metal such as steel. It is possible to reduce the frequency of parts replacement.

In addition, since the bridle roller device can be placed away from the rolling mill, a large roller guide mechanism can be adopted, and direct strip meandering prevention by moving the bridle roller in the axial direction can be done away from the rolling mill. This can be carried out satisfactorily in situ, ie at a distance from the place where the strip is squeezed by the working rolls of the rolling mill.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Note that this embodiment is applied to an entrance guide device of a cold tandem mill.

In the figure, 1 is a first rolling mill, and 2 and 3 are its work rolls, which are reinforced by reinforcing rolls 4 and 5, respectively. The strip 6 is wound around an extruder drum 7 as a raw material coil 6A, and is connected to a deflector roller 8 and a threading guide 9.
It is supplied to the work rolls 2 and 3 via. Note that both edges of the strip 60 in the width direction are supported at a plurality of locations by folding rollers (not shown).

Reference numeral 10 denotes a biting device that forces the rolling mill 1 to bite the tip of the strip 6. This clamping device 10 is arranged close to the working rolls 2.3 of the rolling mill 1 and is clamped into the housing IA of the rolling mill 1. That is, a support frame 12 is mounted on a guide rail 11 provided in the housing iA so as to be movable in the path direction via a truck 13. This truck 13 is driven forward and backward in the path direction by a sticker cylinder 14. . The supporting frame 15 is movably provided, and a lower pad 16 is detachably attached to the lower movable frame 15.

This lower pad 16 has its surface substantially aligned with the pass line. Note that centering guides 17 are provided on both sides of the lower movable frame 150 to regulate both sides of the IJ knob 60 in the width direction. Further, an upper movable frame 18 is attached to the upper side of the support frame 12 so as to be movable up and down via a cylinder 19, and an upper pad 20 is detachably attached to this upper movable frame 18. Note that the lower pad 16 and the upper pad 20 are made of a highly wear-resistant material such as steel. The strip 6 can be clamped by lowering the upper pad 20 via the cylinder 19, and by moving the cart 13 toward the work rolls 2 and 3 via the sticker cylinder 14, the tip of the strip 6 can be held between the work rolls 2 and 3. , 3. Note that 21 is a loosening device that cushions the support frame 12 that moves forward during biting.

22 is a bridle roller device that applies tension, that is, back tension, to the strip 6 caught in the rolling mill 1. This bridle roller device 22 is arranged on the entry side of the biting device 100 and is movable in a direction parallel to the roll axis of the rolling mill 1. That is, a guide rail 23 extending in a direction parallel to the roll axis of the rolling mill 1 is installed via a bracket 24 and a seat 25 at the inlet end of the nouji puffer IA of the rolling mill 1 . A support frame 26 is movably mounted on the guide rail 23 via wheels 27, and is driven by a shift cylinder 28. A lower bridle roller 29 is provided on the lower side of the support frame 26 for support.

An upper bridle roller 30 is supported on the upper side of the frame 26 by a roller elevating cylinder 31 via an elevating frame 31A. In addition, 32 is a guide frame provided in one housing of the rolling mill 1, and the support frame 26
By supporting the upper side of the support frame 26, the shift operation of the support frame 26 can be performed stably. Also,
33 is a position detection sensor for detecting the meandering of the strip 6, which quantitatively detects the meandering amount of the strip 6 and sets the shift amount for preventing meandering by the shift cylinder 28 via the illustrated control device. It looks like this.

Next, the action will be explained.

The strip 6 is unwound from six coils wound on an unwinding machine 7. At this time, the upper bridal roller 3
0 is raised by the lifting cylinder 31 to allow the strip 6 to pass. Further, the upper pad 20 is raised by the lifting cylinder 19 to open each pad 16 and '20, and these are moved by the sticker cylinder 14 to the roll blowing section I-k J 7 all l/r strings.
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The tip of the trip 6 passes through this biting device 10.

When it protrudes about 200cm from the lower pad 17,
The upper pad 20 is rapidly lowered by the lifting cylinder 19, and the strip 6 is firmly clamped between the pads 16, 20. The tip of the strip 6 sandwiched between both pads 16.20 is temporarily stopped in this state, and the portion of the strip 6 other than the tip becomes relaxed behind the pads 16.20 by unwinding. In this state the sticker cylinder 14 is activated and the strip 6 protrudes from the pad 16.20.
The tip of the roll moves together with the biting device 10 to the roll side of the rolling mill 1, and is pushed forcefully and at high speed between the work rolls 2 and 3 to perform a biting action. In this case, the work rolls 2, 3 have started to rotate and the strip 6 is drawn in by the work rolls 2, 3. On the other hand, S) At the same time that the tip of the IJ knob 6 bites into the work roll 2.3, the upper pad 20 of the biting device 10 quickly rises, and the upper bridle roller 30 of the bridle roller device 22 descends and relaxes. (according to the condition)) Quickly apply back tension to IJ knob 6. Therefore, even if the raw material coil 6A is in the form of a loose coil, for example, it can be continuously rolled with sufficient tension applied thereto.

Then, during rolling, the strip 6 may shift in the width direction,
In the case of meandering, the amount of deviation is measured by the meandering detection sensor 33, and the shift cylinder 28 is moved based on the signal to perform control to correct the plate deviation or meandering. That is, the entire bridle roller device 22 moves in the direction opposite to the direction of the temporary deviation while the strip 6 shifted to one side in the width direction of the plate is blown in by the bridle rollers 29, 30, thereby performing a centering action. I sandwiched strip 6 like this! Since it shifts, the correction speed is fast and the correction effect is large.

Note that when the material coil 6A approaches the end, the biting device 1
0 moves back and waits at the tip blowing position of the next material coil. In addition, the bridle roller device 22 has a material coil 6A.
At the same time as the upper bridle roller 30 is removed, it is opened, that is, the upper bridle roller 30 rises to become a roller open state, and waits for the next operation.

According to the entry side guide device in the rolling mill according to the above embodiments, the biting device 10 and the bridle roller device 22 are provided on the entry side of the rolling mill 1, so that the strip 6 is guided to the work rolls 2 and 3. Since the cutting action and the back tension application action can be performed separately, it is of course possible to perform these individual operations independently and reliably with each device, but the biting device 10 and the bridle The following special effects are achieved based on each configuration of the roller device 22.

That is, the upper pad 20 of the biting device 10 is connected to the cylinder 19.
Since the pads 16 and 20 are made of a highly wear-resistant material such as steel, the pads 16 and 20 are made of a highly wear-resistant material such as steel. Therefore, unlike the conventional method in which the strip is continuously held in place to provide tension after biting, there is no need to use pieces of wood with low wear resistance, and the frequency of pad replacement can be reduced. Moreover, since it is only necessary to perform the clamping action by the pads 16, 20 when the strip 6 is bitten, each band 16, 20 should have an uneven shape, such as a file, on its surface. This also has the advantage that the tip of the strip 6 can be reliably clamped and forcefully bitten into the work roll 2.3.In addition, a conventional wood chip pad can be used. death,
A specific comparison between the case of using a pad made of steel and the case of using a pad made of steel shows that the coefficient of friction of the conventional pad made of wood is 0.
25~0.35, path direction nopad length is approximately 800~1
000wn1 The band replacement frequency was 5 to 7 days, but according to this example, a metal file was used, the friction coefficient was 1.0 to 1.5, the band replacement frequency was 50 to 60 days, and the pad length was changed. is approximately 500, and the unit consumption as a consumable item can be reduced. Maintenance work such as pad replacement can be reduced.

Furthermore, unlike the conventional arrangement in which the biting device or the bridle roller device is not disposed close to the rolling mill roll and only one of them is used, in this embodiment, the bridle roller device 22 is used as the biting device. 10, the bridle roller 29.
It becomes possible to easily incorporate various mechanisms that move 30i, and it becomes possible to move the bridle roller 29°30 in the axial direction, that is, to shift in a direction parallel to the work roll axis, which was previously impossible. If the bridle rollers 29 and 30 are moved in the axial direction as in this embodiment, the control operation for preventing the strip 6 from misaligning and meandering can be performed directly, unlike the conventional roller angle adjustment. can be done. Moreover, unlike conventional bridle roller devices, the shift operation to prevent meandering can be performed at a position sufficiently far away from the work roll 2.3.
Despite the strong holding force due to the biting force of the work roll 2.3, the strip is moved in the board width direction within a sufficient length range on the entry side of the strip 6, and a sufficient positional shift prevention effect is achieved. become able to.

When the entrance guide device according to the present embodiment as described above is used, it is suitable for being incorporated into a fully continuous mill as a rational equipment arrangement that has been variously studied recently. In other words, in a fully continuous mill, if a problem occurs in a part other than the rolling part (e.g. trouble with the furnace or something else), the rolling part of the main equipment will have to be shut down, so the rolling mill must stop the rolling part for each coil. It is desired that the steel sheet be capable of so-called batch rolling. in this case,
The equipment of this example can apply strong biting and reliable pack tension, so quick biting action can be performed as in batch rolling, so the rolling time required for biting etc. can be shortened, and continuous rolling can be carried out. It is possible to improve the operating rate of the mill.

Moreover, it does not cause surface flaws on the strip.
Furthermore, since the meandering control is reliable, there is no possibility of board bending due to contact of the widthwise side edges of the strip with the vertical rollers, etc. due to the meandering, and this can greatly contribute to improving product quality.

In the above embodiment, the biting device 10 was moved in the path direction using the trolley 13 and the rail 11.
The present invention is not limited to such a device, and for example, a link or a slide table can also be used.

Further, in the embodiment described above, the shift cylinder 28 is used as the drive mechanism for shifting the bridle rollers 29 and 30 in the axial direction, but it is also possible to apply other drive mechanisms in the same manner as described above.

Further, in the drawings showing the above-mentioned embodiments, a configuration is described in which the bridle rollers have three rollers on the lower side and two rollers on the upper side, but the number of rollers is not limited to this, and it goes without saying that the necessary number of rollers can be set.

〔Effect of the invention〕

As described above, according to the entry side guide device for a rolling mill according to the present invention, on the entry side of the rolling mill, (i) a biting pad having a pair of pads capable of holding and opening an IJ knob and movable back and forth in the pass direction; The structure includes a bridle roller device and a bridle roller device which is provided on the entry side of the biting device and whose rollers can move in the axial direction, whereby each action of the squeezing device and the bridle roller device can be individually controlled. Not only can this be done, but it also allows for strong biting without causing surface flaws on the strip, reduces the frequency of pad replacement, and allows the bridle roller to be placed at a distance from the rolling mill roll. An excellent effect can be achieved in that by moving in the axial direction, reliable and sufficient meandering prevention control can be performed.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a front view showing a main part in section, and FIG. 2 is a plan view showing a part in section. 1... Rolling machine, 2, 3... Work roll, 6... S) IJ knob, 10... Biting device, 16.20...
・Pad, 22... Bridle roller device, 29.3
0... Bridle roller. Agent: Patent attorney Tatsuyuki Unuma, 2nd son

Claims (1)

[Claims] 1. The rolling machine is equipped with a biting device that forces the tip of the strip to bite, and a bridle roller device that applies tension to the biting strip, and the biting device is capable of pinching and releasing the strip. The bridle roller device has a pair of pads that are movable back and forth in the rolling mill pass direction and is disposed close to the rolling mill, and the bridle roller device includes a roller unit that can move in a direction parallel to the axis of the rolling mill roll. An entry-side guide device in a rolling mill, characterized in that the entry-side guide device is disposed on the entry side of the biting device.