JP2001009523A - Attached leveler and rolling correction facility using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attached leveler and rolling correction facilities using it, wherein a precise tension control is possible in correspondent with variation of a steel plate thickness, a working roll exchange frequency is reduced thereby, a plate material correction is possible by optimizing the tension control and, a remaining C warpage can also be corrected. SOLUTION: An attached leveler 10 being established between a skin pass mill and a bride roll positioned at its down stream side is equipped with upper, bottom roll units 12 having replaceable working rolls 12a, an inter mesh adjusting device 14 which changes inter mesh volume IM by moving each roll unit 12 up/down, a pitch adjusting device 16 which changes a pitch P by moving the roll units horizontally, and a roll position controlling device 18 for controlling them. Also, a multi roller leveler being set up at down stream side of the bride roll is equipped so as to correct C warpage caused by the attached leveler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension leveler (attached leveler) disposed immediately after a skin pass mill.
More particularly, the present invention relates to an attached leveler and a rolling straightening facility using the same.

[0002]

2. Description of the Related Art In a steel sheet cold rolling line, a temper rolling mill (skin pass mill) and a tension leveler are sometimes used in combination for adjusting the material quality and improving the flatness of the steel sheet. For example, Japanese Patent No. 2845121 entitled "Sheet Shape Control Method and Apparatus", combines a rolling mill and a leveler, controls the shape of the sheet to a medium stretch or quarter wave shape with a rolling mill, and changes the shape with a subsequent leveler. It is to correct.

[0003] A skin pass mill generally employs a single four-high rolling mill, and is usually provided with an elongation of about 0.2% in order to avoid elongation at the yield point during press working. The tension leveler continuously applies plastic elongation to a steel sheet by applying sufficient longitudinal tension to the steel sheet. By adding 0.2 to 0.5% or more of elongation, the tension leveler In addition to correcting the bending (C warp in the width direction and L warp in the longitudinal direction), it also corrects partial elongation of the plate material such as ear waves and middle elongation.

[0004]

In a conventional straightening machine, a bridle roll for applying tension to a steel sheet is provided immediately after a skin pass mill, and a tension leveler is provided downstream of the bridle roll. That is, when used in combination with a skin pass mill, a treatment such as maintaining an intermediate tension constant is required in order to reduce the influence between the two, and there has been a problem that the overall length of the line becomes longer.

In order to solve this problem, the inventors of the present invention have previously devised "Method and Apparatus for Controlling Elongation of Tension Leveler" (Japanese Patent Laid-Open No. 9-85341).
According to the present invention, a tension leveler and a bridging roll are sequentially disposed immediately after a skin pass mill, and the intermediate tension is controlled to a predetermined set value by changing a mill roll rotation speed. Hereinafter, the tension leveler disposed immediately after the skin pass mill is referred to as an attached leveler.

However, such an attached leveler and a rolling straightening facility using the same have the following problems. 1. If the work roll diameter of the tension leveler is increased in accordance with the thickness of the steel sheet, the tension is small even for the thin mesh, even if the intermeshing amount is changed. Absent. 2. Conversely, if the work roll diameter of the tension leveler is reduced in accordance with this when the steel plate is a thin plate, the tension will fluctuate greatly with a slight change in the intermesh amount for thick plates, making it difficult to control the tension accurately. become. 3. The attached leveler (tension leveler) is compact because it is directly connected immediately after the rolling mill, but it is difficult to completely correct the C warpage (warp in the width direction) as described later.

[0007] Therefore, in the conventional attached leveler and the rolling straightening equipment using the same, the optimum work roll diameter is selected according to the thickness of the target steel sheet, and the work roll diameter is changed every time the thickness of the steel sheet changes. , It was necessary to optimize and correct the tension control. For this reason, there has been a problem that the frequency of replacing work rolls is high and the operation rate of the rolling straightening equipment is reduced. In addition, there is a problem that it is difficult to completely correct the C warpage (warpage in the width direction) even if the tension control is optimized in this way.

The present invention has been made to solve such a problem. That is, an object of the present invention is to accurately control a tension in accordance with a change in the thickness of a steel sheet, thereby reducing the frequency of changing work rolls, and optimizing the tension control to correct a sheet material. It is another object of the present invention to provide an attached leveler capable of correcting residual C warpage and a rolling straightening facility using the same.

[0009]

According to the present invention, an attached leveler (10) installed between a skin pass mill (2) and a bridle roll (4) located downstream thereof.
And upper and lower roll units (12) having exchangeable work rolls (12a), and an in-mesh amount (IM) between the work rolls by moving each roll unit up and down.
, A pitch adjusting device (16) for moving each roll unit horizontally to change the pitch (P) between work rolls, and controlling the in-mesh adjusting device and the pitch adjusting device. And a roll position control device (18).

According to the configuration of the present invention, since the work rolls (12a) of the upper and lower roll units (12) can be exchanged, the work roll diameter becomes a small diameter roll for a thin plate, and a large diameter roll for a thick plate. By exchanging to the above, productivity and straightening speed can be increased. Further, in addition to the intermesh adjusting device (14), a pitch adjusting device (16) for changing the pitch (P) between the work rolls is provided, so that the pitch (P) can be reduced while maintaining the same work roll diameter. The correction effect can be enhanced by shortening the length, or the correction effect can be weakened by increasing the pitch (P). Therefore, it is possible to widen the use area of the work rolls having the same diameter, reduce the frequency of replacing the work rolls, and optimize the tension control to correct the plate material. Further, by providing a roll position control device (18) for controlling these, it is possible to precisely control the tension by changing the in-mesh amount (IM) and the pitch (P) according to the change in the thickness of the steel sheet. In addition, the frequency of replacing work rolls can be reduced, and the operation rate of the rolling straightening equipment can be increased.

According to the present invention, a skin pass mill (2) and a bridle roll (4) located downstream thereof are provided.
And a multi-roller leveler (20) installed on the downstream side of the bridle roll, so that the C warpage generated by the attached leveler can be reduced by the multi-roller leveler. Straightening is provided.

According to the structure of the present invention, since the multi-roller leveler (20) is provided on the exit side of the pride roll (4) on the downstream side, the C warp inevitably generated in the tension leveler (attached leveler). It can be corrected with a multi-roller leveler.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 is an overall configuration diagram of a rolling straightening facility using an attached leveler according to the present invention. In this drawing, in the rolling straightening equipment of the present invention, a skin pass mill 2, an attached leveler 10, a bridle roll 4, a multi-roller leveler 20, and a tension reel 8 are installed downstream of the skin pass mill 2 in this order. A shape sensor 6 is provided between the multi-roller leveler 20 and the tension reel 8.
Is installed, and the plate 1 before being wound on the tension reel 8
Is detected.

In this example, the bridle roll 4 is composed of three large-diameter rolls, and the tension T1 of the plate material 1 on the upstream side thereof.
Is controlled to a predetermined set value. The multi-roller leveler 20 includes a plurality of work rolls arranged horizontally, and is configured to repeatedly bend the plate 1 that has exited the bridle roll 4 to correct the bending of the plate.

The reason for installing the multi-roller leveler at this position is as follows. 1. Generally, width warpage occurs inevitably when plastic elongation is applied to a leveler while applying high tension.However, it is indispensable to apply plastic elongation to correct flatness, so warping occurs only when given elongation . This is called C warpage. 2. Thereafter, when the C-warp is corrected by the C-warp correcting unit after the stretching zone of the tension leveler to correct the warp in the width direction (C-warp), the L-warp (longitudinal warp) remains. 3. If L leveling is corrected by a leveler on the entrance side of the pride roll to correct the L level, C warping tends to occur again due to high tension. 4. Therefore, in order to correct the L warpage, it is necessary to correct only the bending in the low tension range on the side of the prydle. 5. In the type in which the rolling mill and the leveler are directly connected, the leveler is small and there is no space, and the L-curvature correction at the bridle entrance side is insufficient or not.

FIG. 2 is a configuration diagram of the attached leveler of the present invention. As shown in this figure, an attached leveler 10 of the present invention is installed between a skin path mill 2 and a bridle roll 4 located downstream thereof, and includes upper and lower roll units 12, an intermesh adjustment device 14, a pitch adjustment. An apparatus 16 and a roll position controller 18 are provided.

The upper and lower roll units 12 have a work roll 12a and a pair of backup rolls 12b that support the work roll 12a. These rolls 12a, 12
b is rotatably attached to the main body 12c of the roll unit 12. In particular, the work roll 12a is configured to be exchangeable with another roll in a short time. For example, two sets of the roll units may be provided in the width direction or the length direction, and these may be replaced as necessary to enable the roll change. Also, 12b in this figure is an intermediate roll,
A configuration in which this is supported by a backup roll (not shown) may be used.

The intermesh adjusting device 14 is, for example, a hydraulic cylinder or a jack device, and moves each roll unit 12 in the vertical direction to change the intermesh amount IM between work rolls. The pitch adjusting device 16 is also a hydraulic cylinder or a jack device, for example, and moves each roll unit horizontally to change the pitch (P) between the work rolls. In the example of this figure, the upper and lower roll units 1
2 are provided independently with the in-mesh adjusting device 14 and the pitch adjusting device 16, however, the upper and lower units may be linked and both may be moved by a single driving device.

The roll position control device 18 controls the intermesh adjustment device 14 and the pitch adjustment device 16. The control device includes, for example, a hydraulic unit and a computer device that controls the hydraulic unit. In response to a change in the thickness of the steel sheet instructed by the control device of the entire production facility, or by signal data from the shape sensor 6, Intermesh amount IM
And the pitch P is changed to accurately control the tension.

FIG. 3 is an explanatory view of the operation of the above-mentioned attached leveler. In this figure, (A) shows work roll 1
FIG. 2B shows the case where 2a has a large diameter D1 (for example, a diameter of 30 mm), and FIG. The intermeshing amount IM is the same (for example, 10 mm)
It is.

According to the configuration of the present invention described above, since the work rolls 12a of the upper and lower roll units 12 can be exchanged, the work roll diameter is changed to the small-diameter roll D2 for a thin plate and to the large-diameter roll D1 for a thick plate. By exchanging, even with the same intermesh amount IM, the productivity and the correction speed of each can be increased.

The solid line in FIG. 3A indicates the case where the pitch between the work rolls is P1, and the two-dot chain line indicates the case where the pitch is P2. In the attached leveler of the present invention, since the pitch adjusting device 16 is provided in addition to the intermesh adjusting device 14, the straightening is performed by shortening the pitch P with the same work roll diameter D1 as shown in this figure. Enhance the effect,
Alternatively, by increasing the pitch P, the correction effect can be reduced. Therefore, it is possible to widen the use area of the work rolls having the same diameter, reduce the frequency of replacing the work rolls, and optimize the tension control to correct the plate material.

It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention.

[0024]

As described above, the attached leveler of the present invention and the rolling straightening equipment using the same can accurately control the tension in response to a change in the thickness of the steel sheet, thereby enabling the work roll to be controlled. It has excellent effects such as the ability to reduce the frequency of replacement of steel, optimize the tension control, correct the plate material, and correct the remaining C warpage.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a rolling straightening facility using an attached leveler according to the present invention.

FIG. 2 is a configuration diagram of an attached leveler of the present invention.

FIG. 3 is an operation explanatory view of the attached leveler of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate (sheet material) 2 Temper rolling mill (skin pass mill) 4 Bridle roll 6 Shape sensor 8 Tension reel 10 Attached leveler (tension leveler) 12 Roll unit 12a Work roll 12b Backup roll (or intermediate roll) 12c Main body 14 Intermesh Adjustment device 16 Pitch adjustment device 18 Roll position control device 20 Multi-roller leveler

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuyuki Sato 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries, Ltd. Inside the Yokohama Engineering Center (72) Inventor Hisashi Honjo Isogo, Yokohama-shi, Kanagawa No. 1, Shin-Nakahara-cho, Ishikawa Kawashima-Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Yasuhiro Soya 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Shogo Tomita Tokyo 1-1-2, Marunouchi, Chiyoda-ku, Japan Nihon Kokan Co., Ltd. (72) Inventor Yukio Kimura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo F-term in Nihon Kokan Co., Ltd. 4E003 AA02 BA12 BA15 BA19 BA32

Claims (2)

[Claims] 1. An attached leveler (10) installed between a skin pass mill (2) and a bridle roll (4) positioned downstream thereof, the upper and lower having an exchangeable work roll (12a). Roll unit (12),
An intermesh adjusting device (14) for moving each roll unit up and down to change the intermesh amount (IM) between work rolls, and moving each roll unit horizontally to change the pitch (P) between work rolls A pitch adjusting device (16) for controlling the in-mesh adjusting device and the roll position controlling device (18) for controlling the pitch adjusting device.
Attached leveler, characterized in that: 2. An attached leveler (10) installed between a skin pass mill (2) and a bridle roll (4) located downstream thereof, and a multi-roller leveler installed downstream of the bridle roll. (20)
A rolling straightening facility wherein the C warpage generated by the attached leveler is corrected by a multi-roller leveler.