JP3574638B2 - Temper rolling mill and temper rolling method for preventing warp and uneven gloss of steel strip - Google Patents

Description

【００１３】
【発明の効果】
本発明によれば、下側補強ロールの押付け装置を設置することにより、作業ロールの偏摩耗の発生を抑制し、鋼帯の幅方向の反り（Ｃ反り）おより光沢むらを防止する調質圧延機および調質圧延方法を提供することができ、 従来技術の約１００分の１の投資額で同等の効果を得ることが可能であるなど、産業上有用な、顕著な効果を奏する。
【図面の簡単な説明】
【図１】調質圧延機のロール軸方向の断面図である。
【図２】下側補強ロールを上から見た図である。
【図３】２つのスタンドを有する調質圧延機の場合の本発明の実施形態を示す図である。
【図４】下側補強ロールをロール軸方向から見た図である。
【符号の説明】
１…ハウジング（支持窓）
２…プロジェクトブロック
３…ＷＲチョック
４…ＢＵＲチョック
５…ライナープレート
６…油圧ジャッキ
７…油圧シリンダー
ＷＲ…ワークロール（作業ロール）
ＢＵＲ…バックアップロール（補強ロール）[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temper rolling mill and a temper rolling method for preventing a warp (C warp) and uneven luster of a steel strip in a temper rolling mill for cold-rolling a cold-rolled and annealed steel strip again. .
[0002]
[Prior art]
FIG. 1 shows a cross-sectional view in the roll axis direction of the temper rolling mill.
In the temper rolling mill, the work roll (WR) is supported by the WR chock 3 and the reinforcing roll (BUR) is supported by the BUR chock 4.
Further, the WR chock 3 is held by the housing (support window) 1 via the project block 2, and the BUR chock 4 is held by the housing 1 directly.
In consideration of the thermal expansion of the roll chock during rolling, a gap of usually about 0.5 mm is provided between the roll chock and the housing so that roll exchange after rolling can be performed smoothly.
[0003]
Regarding the gap between the roll chock and the roll, in a mill for thin rolling, the work roll is offset from the reinforcing roll by the axis of the roll, and the work roll is pressed against the WR chock 3 at the time of rolling down. Has been used to stably restrain.
In addition to this, the vibration of the work roll due to the difference in the rolling reaction force and the tension and the difference in the gap between the chock on the drive side and the work side and the support window are also caused by the axis of the work roll and the axis of the reinforcing roll adjacent to it. Is an element that degrades the parallelism with.
This difference in parallelism between the work roll and the reinforcing roll causes a slip between the steel strip and the work roll during rolling, thereby inducing a difference in roughness between the upper and lower work rolls or a difference in the width direction. This has a remarkable adverse effect on warpage (C warpage) in the width direction of the steel strip or uneven gloss due to a difference in roughness.
[0004]
As a method for preventing width warping of a steel strip, Japanese Patent Application Laid-Open No. 2-55601 discloses a method of controlling a cross angle between a work roll and a roll adjacent thereto using a roll parallelism detecting device and a roll parallelism adjusting device. However, this method is an over-specification method in which more elements than necessary are provided because the element that most affects the cross angle cannot be identified, and equipment modification costs and equipment are extremely expensive. There was a problem.
[0005]
[Problems to be solved by the invention]
The present invention solves the problems of the prior art as described above, and by providing a minimum necessary device, an inexpensive method that eliminates the difference in roughness between the upper and lower rolls that leads to warpage in the width direction of the steel strip and uneven gloss. It is an object to provide a temper rolling mill and a temper rolling method.
[0006]
[Means for Solving the Problems]
According to the present invention, the work roll vibration during rolling, the deviation of the parallelism due to the dimensional difference in the chock is not so large as to affect the roughness difference between the upper and lower work rolls, but rather the deviation of the installation position of the roll adjacent to the work roll is the most. Focusing on the fact that this is a factor with a high degree of influence, the installation of a device that always presses the chock position of the lower reinforcing roll, which is less susceptible to the pressing force due to offset, to a fixed position suppresses the difference in roughness between the upper and lower work rolls The gist of the method is as follows, and the gist is as follows.
[0007]
(1) A temper rolling mill for cold-rolling a cold-rolled and annealed steel strip again, wherein the work roll and the reinforcing roll are arranged with an offset. Means for suppressing the cross angle between the work roll and the reinforcing roll by pressing the choke portion of the lower reinforcing roll adjacent to the work roll to be rolled to the housing to make the initial installation position of the choke portion constant. A temper rolling mill for preventing warpage and uneven gloss of a steel strip, comprising:
(2) In the temper rolling method in which the cold-rolled and annealed steel strip is cold-rolled again, the temper rolling mill arranges a work roll and a reinforcing roll with an offset, and rolls the steel strip. A steel, wherein a cross angle between the work roll and the reinforcing roll is suppressed by pressing a chock portion of a lower reinforcing roll adjacent to the roll against the housing to make an initial installation position of the chocking portion constant. Temper rolling method to prevent warp and uneven gloss of belt.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The work roll (WR) and the reinforcement roll (BUR) are arranged with a certain amount of offset as shown in FIG. 1, and when the rolling force is applied, the work roll moves to the exit side of the steel strip, and the reinforcement roll It is pressed against the entry side housing surface of the steel strip.
Here, since the BUR chock 4 has a large frictional force with the liner plate 5 installed on the floor surface, the lower reinforcing roll does not move by the component force due to the offset, and the initial installation position is corrected even during rolling. It will not be done.
Therefore, if the initial installation position of the lower reinforcing roll has a WR and a cross angle, this cross angle will be maintained throughout the rolling, and
It was found that this was a cause of uneven wear of the work roll, and as a result, warpage (C warpage) in the width direction of the steel strip and uneven gloss were generated.
[0009]
Therefore, after the lower reinforcing roll is assembled, the reinforcing roll chock position is pressed against the inlet housing surface as shown in FIG. 2 so that the initial installation position is constant and the largest displacement occurs between the lower reinforcing roll and the lower work roll. It has been found that the angle difference can be eliminated.
An embodiment of the present invention will be described below with reference to FIGS.
FIG. 2 is a view of the lower reinforcing roll as viewed from above.
When the lower reinforcing roll is incorporated, the left and right BUR chocks are pressed against the housing in the entry side of the steel strip so that the axial direction of the lower reinforcing roll coincides with the housing surface, so that the lower work roll and the lower The cross angle with the side reinforcing roll can be suppressed.
[0010]
The work rolls other than the lower reinforcing roll and the upper reinforcing roll have the axial direction of the roll that coincides with the direction of the housing surface due to the horizontal component force at the time of reduction based on the offset. Of the lower work roll and the lower reinforcing roll can be suppressed.
FIG. 3 is a diagram showing an embodiment of the present invention in the case of a temper rolling mill having two stands.
Hydraulic piping is installed from the hydraulic jack 6 to a total of four hydraulic jacks 7 installed on the steel strip exit side of the BUR chock 4 of the lower reinforcing rolls of the two stands (# 1STD and # 2STD), and the lower reinforcement is provided. When the roll is incorporated, the hydraulic jack is operated to press the BUR chock against the housing on the steel strip entry side, whereby the axial direction of the lower reinforcing roll can be matched with the direction of the housing surface.
[0011]
FIG. 4 is a view of the lower reinforcing roll as viewed from the roll axis direction.
When the lower BUR chock is pressed against the entrance housing surface by the hydraulic cylinder 7, the axis of the lower reinforcing roll coincides with the direction of the entrance housing surface.
Table 1 shows the effects of the present invention.
The upper part shows the occurrence rate of warpage (C warp) and uneven gloss in the steel strip width direction of the present invention, and the lower part shows the same occurrence rate of the comparative example.
With the application of the present invention, the degrading rate for lowering the quality rank of the steel strip becomes zero,
In addition, the recompression ratio after rolling was almost zero.
[0012]
[Table 1]

[0013]
【The invention's effect】
According to the present invention, by installing the pressing device for the lower reinforcing roll, the occurrence of uneven wear of the work roll is suppressed, and the heat treatment for preventing the warp (C warp) in the width direction of the steel strip and the uneven gloss. A rolling mill and a temper rolling method can be provided, and an industrially useful and remarkable effect such as an equivalent effect can be obtained with an investment of about one hundredth of that of the related art.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the roll axis direction of a temper rolling mill.
FIG. 2 is a top view of a lower reinforcing roll.
FIG. 3 is a diagram showing an embodiment of the present invention in the case of a temper rolling mill having two stands.
FIG. 4 is a view of the lower reinforcing roll as viewed from the roll axis direction.
[Explanation of symbols]
1. Housing (support window)
2 Project block 3 WR chock 4 BUR chock 5 Liner plate 6 Hydraulic jack 7 Hydraulic cylinder WR Work roll (work roll)
BUR: Backup roll (reinforcing roll)

Claims (2)

A temper rolling mill for cold-rolling a cold-rolled and annealed steel strip again, wherein the work roll and the reinforcing roll are arranged with an offset to roll the steel strip. A means for suppressing a cross angle between the work roll and the reinforcing roll by pressing a choke portion of the lower reinforcing roll adjacent to the work roll against the housing to make the initial installation position of the choke portion constant. A temper rolling mill that prevents warpage and uneven gloss of steel strip. In the temper rolling method of cold rolling and again cold rolling the annealed steel strip, the temper rolling mill arranges a work roll and a reinforcing roll with an offset, and is adjacent to a work roll for rolling the steel strip. Pressing the choke portion of the lower reinforcing roll against the housing to make the initial installation position of the choke portion constant, thereby suppressing the cross angle between the work roll and the reinforcing roll. Temper rolling method to prevent warpage and uneven gloss.

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