JPH0615331A - Centering devices on inlet and outlet sides for rolling mill - Google Patents

Abstract

PURPOSE:To mount multi-stage edger mills in place of a side guide and to obtain a sufficient centering effect as space saving and cost saving are realized by positive biting of the edger mills. CONSTITUTION:The edger mills 2a-2d composed of one pair of facing vertical rolls 1 are mounted by two mills on both sides of a passing path of a sheet bar on the inlet and outlet sides of the outside of a housing and a column H, etc., of a horizontal mill B at the maximum pitch shorter than the shortest sheet bar A passed through. Positioning motors 4 mounted respectively on the edger mills 2a-2d are controlled by edger mill controllers 5 and a clearance between both rolls is expanded before the tip part of the sheet bar is bitten into the edger-mills and when the tip part of the sheet bar arrives at the edger mills, the clearance between both rolls is reduced and bitten at a prescribed rolling reduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering device for an input side and an output side of a rough mill in a row of rough rolling mills of a hot continuous rolling mill.

[0002]

2. Description of the Related Art In a rough rolling mill of a hot continuous rolling mill, a horizontal mill alone or a rough mill having a tandem structure of a horizontal mill and an edger mill is opposed to both sides of a sheet bar passageway on the inlet side and the outlet side of a rough mill. A pair of side guides are provided, and the opening degree is 30 to 50 m than the width of the seat bar (hereinafter referred to as the plate width).
The seat bar is set wide so that the approaching seat bar is guided to the center of the mill and skewing is prevented. However, it is difficult to say that the guiding effect is satisfactory because the plate is passed with the side guide opening wide so that the seat bar can smoothly enter.

Therefore, in recent years, a hydraulically driven side guide has also been developed in order to improve stripability (Japan Iron and Steel Institute, No. 5).
1st Hot Strip Subcommittee 51-4 "Measures to improve thin material threadability"), tightening so that the gap between the seat bar side edge becomes smaller when the seat bar enters the side guide, and positive guiding is performed. I started to pass through. An example of such a side guide device is shown in FIG. In the figure, the seat bar A advances in the direction of arrow Z, and side guides C are provided facing each other on both sides of the sheet bar passages on the inlet side and the outlet side of the horizontal mill B. This side guide C is driven by a hydraulic cylinder D, and as shown in FIG. 5, via a pinion F and a rack beam G in a pinion stand E, symmetrically with respect to the rolling line center (mill center),
Further, the centering of the seat bar A is possible by opening and closing the guide C in a direction orthogonal to the sheet passing direction of the seat bar A.

It is desirable to guide this type of side guide as close as possible to the rough mill. This is because the entrance side guide enhances the centering effect and the exit side guide enhances the tip bending suppression effect. Therefore, in this side guide device, a small side guide device having a retractable side guide J is installed in the vicinity of the mill B so as to be housed in the housing H of the horizontal mill B or the support H.

When the seat bar A is centered by such a side guide device, the clearance between the side edge of the seat bar and the side guide C becomes smaller before the tip of the seat bar A is caught in the horizontal mill B. Both side guides C are tightened at the same time, and the skewed sheet bar A is sandwiched so that the center of the sheet bar A and the mill center are aligned.

[0006]

However, since the hydraulically driven inlet side guide is centered by tightening the opening of the guide after entering the seat bar, the inlet side guide is bent with respect to the seat bar whose rear end is bent. If you try to pass the seat bar while tightening the side guide, it may be forcibly pulled in by the excessive force of the horizontal mill, and the side edge of the seat bar may be greatly scratched, or the seat bar may break in extreme cases. There is also a risk of damaging the side guides.

On the other hand, it is desired that the exit side guide has a gap as small as possible with the side edge of the seat bar in order to suppress bending of the seat bar. May cause the seat bar to rub against the side guide or collide with the side guide in a significant case.In such a case, the side edge of the seat bar may be greatly scratched or the side guide may be damaged as described above. There is also a possibility.

Due to the above reasons, the conventional side guide device has a limit in increasing the guiding pressure, and it is not possible to obtain a positive guiding effect. However, in the side guide device having the structure as shown in FIG. 5, the necessary tightening force required for centering and bending correction of the seat bar is proportional to the plate weight and plate length and inversely proportional to the side guide length. In order to sufficiently center the seat bar, the hydraulic cylinder must be made large and the side guide length must be made long, resulting in an unnecessarily large-scale device. In addition, long and heavy sheet bars may not be perfectly centered, especially in the latter stage of the rough mill, and off-centering due to slanting biting into the edger mill or horizontal mill causes the plate to bend (camber).
There was a problem to induce.

The present invention was developed in view of these problems, and it is possible to achieve a sufficient centering effect while realizing a space saving and a cost saving, and a centering device for a rough mill. It is intended to provide.

[0010]

According to a first aspect of the present invention, there is provided a rough mill inlet side and outlet centering device for an inlet side and an outlet side of a rough mill in a rough rolling mill train of a hot continuous rolling mill. Among them, an edger mill having a pair of vertical rolls facing both sides of at least one of the sheet bar passageways,
Two or more sheet bars to be threaded are installed at a maximum pitch shorter than the shortest plate length, and the edger mill is provided with a drive device for changing the gap between the facing rollers. .

According to a second aspect of the present invention, in the rough mill inlet side and outlet centering device, based on the tracking information of the sheet bar, the rolls of both rolls are rolled until the leading end of the sheet bar is caught in the edger mill. An edger mill controller for controlling the drive unit so that the gap is widened and when the leading end of the sheet bar reaches the edger mill, the gap between both rollers is narrowed and the rollers are bitten with a predetermined amount of reduction from the leading end is provided. It is a feature.

[0012]

In the inlet and outlet centering devices for the rough mill according to the first aspect of the present invention, the edger mill drive devices provided in the sheet bar passages on the inlet and outlet sides of the rough mill are driven. By changing the gap between each pair of rolls facing each other on both sides of the plate passage, both side edges of the sheet bar can be bitten into the edger mill to center the biting portion. The center bar of the entire seat bar can be centered by providing at least two base plates with the maximum pitch shorter than the plate length of the shortest bar through which the edger mill is passed. At this time, since the biting force of the edger mill is much larger than the tightening force of the conventional side guide, the centering of the biting part becomes more reliable in each edger mill, and the centering effect of the entire seat bar by the plurality of edger mills is improved. Is improved. Moreover, since the edger mill is originally rotated in the sheet passing direction of the seat bar, there is no possibility that the side edge of the seat bar will be rubbed or collided by being pinched as in the conventional side guide device.

In the rough mill entry and exit centering device according to the second aspect of the present invention, the edger mill control device controls the drive device based on the tracking information of the sheet bar so that the leading end portion of the sheet bar is The gap between both rolls is widened until it is bitten into the edger mill, and when the tip of the sheet bar reaches the edger mill, the gap between both rollers is narrowed and bited from the tip with a predetermined amount of rolling, so that a particularly rough mill It is possible to center the seat bar, which is skewed on the entrance side, sequentially such that the leading biting portion rotates around the trailing biting portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a hot rolling mill equipped with the rough mill inlet and outlet centering devices. In the figure, the sheet bar A is passed through the horizontal mill B in the arrow Z direction. Further, the housing and the support H of the horizontal mill B are installed at a position slightly distant from the mill itself. In this embodiment, a small side guide device having a retractable side guide J is installed in the vicinity of the mill B in the form of being housed in the housing of the horizontal mill B, the column H or the like as in the conventional case. Further, a guide side guide 10 is provided at the most entrance side of the horizontal mill B so as to expand outward toward the seat bar entry side. The entrance side end of the guide side guide 10 is rotatably connected to a frame (not shown) through an elongated hole 11 formed in the entrance side end, and the guide side guide 10 exits. The side end is connected to an opening / closing mechanism 12 that opens and closes the outlet end symmetrically with respect to the mill center. This opening / closing mechanism 12
Is driven by a hydraulic cylinder D similarly to the opening / closing mechanism of a conventional side guide device, and as shown in FIG. 5, via a pinion F and a rack beam G in a pinion stand E with respect to the rolling line center (mill center). The exit end of the guide side guide 10 is opened and closed symmetrically and in a direction orthogonal to the sheet passing direction of the seat bar A about the entrance end as a center.

In the present invention, the edger mill 2a having a pair of vertical rolls 1 facing each other on both sides of the sheet bar passage path on the inlet side and the outlet side of the horizontal mill B on the outer side of the housing, columns H and the like. Two 2d are installed in each. Conventionally, these edge mills 2a to 2d are H-
It is the same as a normal edger mill used in a V tandem mill or the like. For example, the edger mills 2a to 2d used in this embodiment, as shown in FIG. 2, apply the rotational force of the main drive motor 3 to one rotary shaft 13 and set two bevel gears attached to the rotary shaft 13. It branches by 14 and is transmitted to each vertical roll 1 in the opposite direction. On the other hand, the rotational force of the two position setting motors 4 provided in the lower part of the device is converted into a linear motion force by a rotary motion-linear motion conversion mechanism such as a screw mechanism,
By this linear motion force, the two vertical rolls 1 are moved together with the mounting base portion 15 and the bevel gear unit 16 so that the gap (roll opening) between both vertical rolls 1 can be changed / adjusted. At this time, each of the bevel gears 14 and the rotating shaft 1
Since 3 is connected by the spline 13a,
With the movement of the vertical roll 1 and the bevel gear unit 16, the bevel gears 14 of each set are slidably moved on the splines 13a. For the sake of simplification, of these edge mills, the entry side first edge mill 2a, the entry side second edge mill 2b, and the exit side first edge mill 2c, the exit side second edge mill 2d are described in the order closer to the entry side. .

The drive device for rotating and changing the position setting is controlled by each setting signal from the edger mill controller 5, as shown in FIG. Further, the edger mill control device 5 exchanges signals with the tracking control device 6, and the tracking control device 6 exchanges signals with the higher continuous rolling mill control device 7. The continuous rolling mill control device 7 is for comprehensively controlling and monitoring the rolling speed including the amount of reduction and leveling of the mill according to the specifications and specifications of the sheet bar A, and tracking. The controller 6 obtains the position information of each sheet bar A, monitors the sheet passing speed, and determines the rotational speed of each mill related to the sheet passing speed, the rotational speed of the table roller necessary for conveyance, and the like in the continuous rolling. It is for controlling together with the machine control device 7.

A microcomputer (not shown) is installed in the edger mill control device 5, and a program shown in the flowchart of FIG. 3 is stored in advance in the microcomputer, and the main drive motor 3 and the main drive motor 3 are stored based on the program. The rotation and opening degree of both vertical rolls 1 are controlled by controlling the rotation speed / rotation time of the position setting motor 4.

This program will be described in detail with reference to FIG. In this program, each motor 3, 4
The rotational speeds such as the rotation speed / rotation time, the rotation speed of the vertical roll 1, and the moving speed / moving time of the vertical roll 1 are automatically calculated according to a model formula obtained by experience in advance. First, in step S1, the plate width of the sheet bar A given from the continuous rolling mill control device 7,
Read information signals such as strip length, position of center of gravity, material specifications, amount of reduction of horizontal mill B, strip width and strip thickness after rolling.

Next, the process proceeds to step S2, where each edger mill 2a ...
The reduction amount of 2d is calculated. Next, in step S3, it is determined whether or not each of the edger mills 2a to 2d is rotating at a rotation speed that satisfies a predetermined strip passing speed with the reduction amount calculated in step S2, and the vertical roll 1 If the rotation speed of No. 1 satisfies the predetermined strip passing speed, the process proceeds to step S4, and if not, the process proceeds to step S5.

In step S5, each edge mill 2
The rotational speed correction signals a to 2d of the vertical roll 1 are sent to the main drive motor 3 and the process proceeds to step S4. In the step S4, each of the edge mills 2a-2
It is determined whether or not the vertical roll 1 of d is in the retracted position. If it is in the retracted position, the process proceeds to step S6, and if not, the process proceeds to step S7.

In step S7, each edge mill 2
A backward position setting signal of the vertical rolls 1 to 2d is sent to the position setting motor 4 and the process proceeds to step S6. In step S6, the tracking information from the tracking control device 6 is read. Next, the process proceeds to step S8, and it is determined from the tracking information whether or not the leading end of the sheet bar A is just before being bitten into the entry-side first edger mill, and the tip end is set to the entry-side first edger mill 2a. If it is just before biting, the process proceeds to step S9, and if not, the process proceeds to step S6.

In step S9, the vertical roll 1 of the entry-side first edger mill 2a is set so that the tip end of the sheet bar A passes through the entry-side first edger mill 2a so that the tip end bites with a predetermined reduction amount. An advance position setting signal for advancing to a predetermined reduction amount position when the tip portion is engaged is sent to the position setting motor 4. Next, the process proceeds to step S10, and the tracking information from the tracking control device 6 is read again.

Next, the process proceeds to step S11, where the leading end of the sheet bar A is the second entry side from the tracking information.
It is determined whether or not it is just before biting into the edger mill 2b. If the tip is just before biting into the second entrance side edger mill 2b, the process proceeds to step S12, and if not, the process proceeds to step S10. . Step S
In No. 12, the vertical roll 1 of the entry side second edger mill 2b bites the tip end portion so that when the tip end portion of the sheet bar A passes through the entry side second edger mill 2b, the tip end portion is bitten by a predetermined reduction amount. At the same time, a forward position setting signal for advancing to a predetermined reduction amount position is sent to the position setting motor 4.

Next, in step S13, the tracking information from the tracking control device 6 is read three times. Next, the process proceeds to step S14, and it is determined from the tracking information whether or not the leading end of the sheet bar A is just before being bitten into the exit side first edger mill 2c, and the tip end is located on the exit side first edger mill 2c. If it is just before biting into, the process proceeds to step S15, and if not, the process proceeds to step S13.

In step S15, the vertical roll 1 of the outlet-side first edger mill 2c is set so that the leading edge of the sheet bar A passes through the outlet-side first edger mill 2c and is bitten by a predetermined reduction amount. An advance position setting signal for advancing to a predetermined reduction amount position when the tip portion is engaged is sent to the position setting motor 4. Next, the process proceeds to step S16, and the tracking information from the tracking control device 6 is read four times.

Next, the process proceeds to step S17, where the leading end of the sheet bar A is the second output side from the tracking information.
It is determined whether or not it is just before biting into the edger mill 2d, and if the tip is just before biting into the output side second edger mill 2d, the process proceeds to step S18, and if not, the process proceeds to step S16. . Step S
In No. 18, the vertical roll 1 of the output side second edger mill 2d bites the tip end portion so that the tip end portion of the sheet bar A bites the output side second edger mill 2d with a predetermined reduction amount when passing through the output side second edger mill 2d. At the same time, a forward position setting signal for advancing to a predetermined reduction amount position is sent to the position setting motor 4.

Next, in step S19, the tracking information from the tracking control device 6 is read five times. Next, the process proceeds to step S20, and it is determined from the tracking information whether or not the tail end portion of the sheet bar A has been bitten off from the exit side second edge mill 2d, and the tail end portion is positioned at the exit side second edge mill 2d. If it is after being bitten from, the process proceeds to step S21, and if not, the process proceeds to step S19.

In step S21, the vertical roll 1 of each of the edger mills 2a to 2d is retracted to the open retracted position so that each of the edger mills is opened. To do. In this edger mill control device, by controlling the edger mill opening according to the program, the tip portion of the seat bar A is moved to the edger mills 2a to 2d as shown in FIG.
When the front end portion is bitten by the both vertical rolls 1 when passing through, the entire seat bar is centered so that the preceding biting portion is rotated around the trailing biting portion of the skewed sheet bar A. It At this time, rather than sandwiching the seat bar as in the conventional side guide device, the seat bar is positively engaged to ensure the centering of each engaged portion and also improve the overall centering effect. Further, since the edger mills are positively rotating so as to pass the seat bar at a predetermined stripping speed while the seat bar is bitten by a predetermined reduction amount, the seat bar works like a conventional side guide. Bar edges do not rub or collide.

In this embodiment, a total of four edger mills, two on the inlet side and two on the outlet side, of the horizontal mill are controlled by one edger mill controller, but for example, one edger mill is controlled for each edger mill. A base edger mill control device may be provided, or the edger mill of the entire rolling line may be controlled by a single edger mill control device.
At this time, it should be noted that the former case complicates the signal processing of each edger mill control device, and the latter case complicates the processing of the tracking information of the preceding and following sheet bars.

In this embodiment, two horizontal edge mills are installed on the inlet side and two edger mills are installed on the outlet side, but in the present invention, two or more edger mills may be installed on each side. Desirably, the edger mill should be provided at the maximum pitch shorter than the shortest sheet bar length that is passed at least on the rough mill exit side, but on the rough mill entry side, multiple edger mills should be provided at even shorter pitches. Is good.

Further, although the control of each side guide is not described in detail in this embodiment, these side guides must control the opening degree according to the specification specifications of the seat bar and the tracking information as in the conventional case. It goes without saying that it must be done. Further, in this embodiment, the edger mill on the outlet side of the horizontal mill is also configured to control the opening thereof according to the passage of the sheet bar. However, the edger mill originally has some bending or skew due to its high centering effect. Even if there is, you can bite the seat bar. Therefore, if the skew and bending of the seat bar can be sufficiently corrected or suppressed by the entry side edger mill, the opening degree of the exit side edger mill may not be controlled in accordance with the plate.

[0032]

As described above, according to the rough mill inlet and outlet centering devices of the present invention, two or more pairs of sheet bar passages on the inlet and outlet sides of the rough mill are provided. By driving the edger mill drive device and engaging the side edge of the seat bar with the edger mill to center the entire seat bar, the center of the seat bar can be reliably centered on the mill center. As described above, there is no possibility that the side edge of the seat bar will be rubbed or collided by being pinched.

Further, the edger mill control device controls the drive device based on the tracking information of the sheet bar so that the edger mill is bitten by a predetermined reduction amount from the leading end portion of the sheet bar, so that the slanting mill entrance side is inclined. The running seat bar can be sequentially centered so that the leading bite part rotates around the trailing bite part, and the entire seat bar temporarily rotates like a conventional side guide device. The force can be reduced, the impact load on the device is reduced accordingly, the centering of the entire seat bar is smoothed, and the centering effect is improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a rough mill facility using an inlet side and outlet side centering device for a rough mill of the present invention.

FIG. 2 is a structural explanatory view of a drive device and a control device for each edger mill of the centering device of FIG.

FIG. 3 is a flowchart showing a program stored in the edger mill control device of FIG.

FIG. 4 is a schematic plan view of rough mill equipment using an example of a conventional rough mill inlet side and outlet side guide device.

5 is a side view showing a drive mechanism of the side guide device of FIG. 4. FIG.

[Explanation of symbols]

 1 is a vertical roll 2a to 2d is an edger mill 3 is a main drive motor 4 is a position setting motor 5 is an edger mill controller 6 is a tracking controller 7 is a continuous rolling mill controller A is a sheet bar B is a horizontal mill H is a housing or Props, etc.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kiyoshi Takagi, 1-chome, Mizushima Kawasaki-dori, Kawashima-dori, Kurashiki-shi, Okayama Prefecture (no address), inside the Mizushima Works, Kawasaki Steel Co., Ltd. (72) Nobuhiro Tazo, Shinaka Isogo-ku, Yokohama-shi, Kanagawa Haramachi No. 1 Ishi Kawashima Harima Heavy Industry Co., Ltd. Yokohama No. 2 Factory (72) Inventor Matsunuma Seto Shin Nakahara Town No. 1, Shin Nakaharacho, Isogo Ward, Yokohama, Kanagawa Ishi Kawashima Harima Heavy Industry Co., Ltd. Yokohama No. 2 Factory

Claims (2)

[Claims] 1. An edger mill having a pair of vertical rolls facing each other on both sides of at least one of a sheet bar passing path of an input side and an output side of a rough mill in a row of rough rolling mills of a hot continuous rolling mill. A rough mill characterized in that two or more sheet bars to be passed through are installed at a maximum pitch shorter than the shortest plate length, and the edger mill is provided with a drive device for changing the gap between the rollers facing each other. Incoming and outgoing centering device. 2. Based on the tracking information of the sheet bar, the gap between both rolls is widened until the leading edge of the sheet bar is bitten into the edger mill, and when the leading edge of the sheet bar reaches the edger mill, the rollers of both rollers are moved. 2. The rough mill inlet and outlet centering device according to claim 1, further comprising an edger mill control device for controlling the drive device so that the gap is narrowed and the tip end portion is bitten by a predetermined reduction amount. .