JPS62161410A - rolling mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a rolling mill that can easily control the shape of a rolled plate.

[Prior Art] Conventionally, in rolling mills, various shapes of rolled plates have been controlled in order to prevent edge elongation, middle elongation, and edge drops from occurring in the rolled plates.

[Problems to be Solved by the Invention] However, in conventional rolling mills, for example, when the diameter of the work roll is reduced, the horizontal rigidity decreases and it becomes easier to bend.
The tension applied to the rolled plate causes the roll to bend in the horizontal direction, which causes a slight change in the gap between the upper and lower work rolls, causing deterioration in the cross-sectional shape of the rolled plate.

Furthermore, in the case of a four-high rolling mill, since the work roll is in direct contact with the backup roll, it is difficult to control increase roll bending in the vertical direction.

The present invention has been made in view of the above-mentioned circumstances, with the object of easily controlling the shape of a rolled plate so that the shape of the rolled plate can be easily controlled.

[Means for Solving the Problems] The present invention provides a structure in which, between at least one of a pair of upper and lower work rolls and a pair of upper and lower backup rolls, and the backup roll, a A horizontal position control device that interposes two intermediate rolls offset in the front and rear directions in the rolling plate traveling direction, and controlling the horizontal position of the intermediate rolls in a direction parallel to the rolling plate traveling direction, and both end shafts of the intermediate rolls. A horizontal roll bending device that provides horizontal roll bending to the intermediate roll by means of split rolls that are divided into multiple parts in the longitudinal direction of the intermediate roll, and a vertical roll that provides vertical roll bending to the work roll. The present invention is equipped with at least one of a bending device and a roll shift device that moves the upper and lower work rolls in opposite directions in the longitudinal direction.

[Function] The position of the intermediate roll in a direction parallel to the rolling plate traveling direction is controlled by a horizontal position control device, or the intermediate roll is given horizontal roll bending by a horizontal roll bending device that gives horizontal roll bending to the shaft end. , or the work roll is given a horizontal roll bending by a horizontal roll bending device with split rolls, or the work roll is given a vertical roll bending by a vertical roll bending device, or the work roll is shifted longitudinally. Rolling is performed under one control.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which a pair of upper and lower small-diameter work rolls 1 and 2 and a backup roll 3.
Two intermediate rolls 5, 6, each upper and lower, are arranged parallel to the work rolls 1, 2 and backup rolls 3, 4, and the rolling load is transferred from the backup rolls 3, 4 to the intermediate rolls 5, 4.
6 to the work rolls 1, 2, and the shaft box supporting each intermediate roll 5, 6 has a position parallel to the traveling direction of the rolling plate 16 of the intermediate rolls 5, 6. Horizontal position control devices 7, 8 for controlling the intermediate rolls 5, 6, or horizontal roll bending devices 7', 8' for imparting horizontal roll bending to the intermediate rolls 5.6NIi are installed.

Before and after the intermediate rolls 5, 6, divided rolls 9, 10 are parallel to the intermediate rolls 5, 6 and are divided into a plurality of parts in the longitudinal direction.
are rotatably arranged, and fluid pressure cylinders 11 and 12 are connected to the divided rolls 9 and 10, respectively, so that the rolls 9 and 10 can independently move in a direction parallel to the direction of travel of the rolling plate 16, By operating the hydraulic cylinders 11 and 12, horizontal roll bending can be applied to the intermediate rolls 5 and 6 by the split rolls 9 and 10, and the split roll 9
, 10, hydraulic cylinders 11.12, etc., form a horizontal roll bending device 13.14.

A vertical roll bending device 15 for imparting vertical roll bending to the work rolls 1 and 2 is disposed in the axle box portion that supports the work rolls 1 and 2. ? can be shifted in the longitudinal direction by a roll shift device (not shown).

In the rolling mill, at least one of the horizontal position control device 7.8 or the horizontal roll bending device L81, the horizontal roll bending device 13-14 with split rolls 9 and 10, the vertical roll bending device 15, and the roll shifting device L81 is used. The combination of these devices may be arbitrary, and of course, all devices may be provided.

Next, shape control of the rolled plate 16 by the rolling mill will be explained.

When controlling the horizontal position of the intermediate rolls 5, 6, the horizontal position control devices 7, 8 move the intermediate rolls 5.6 to the rolling plate 1.
6. Move in a direction parallel to the direction of travel. intermediate roll 5,
6, for example, by moving the intermediate rolls 5, 6 in parallel as shown in FIG.
You can adjust the gap G between 6.6 and 6 to be equal on the left and right sides, or adjust the gap G between intermediate rolls 5 and 5.6.6 to be different on the left and right sides as shown in Figure 3, or adjust the gap G between intermediate rolls 5 and 5.6.6 to be different on the left and right sides as shown in Figure 4. In addition, the upper intermediate roll 5 and the lower intermediate roll 6 can be adjusted so that they cross each other when viewed from above.

In the horizontal position control shown in Fig. 2, the gap between the work rolls 1 and 2 is controlled to be approximately equal on the left and right sides, and in the horizontal position control shown in Fig. 3, the gap between the work rolls 1 and 2 is controlled to be different on the left and right sides. In the horizontal position control shown in FIG. 4, the work rolls 1 and 2 are controlled to cross each other in a plane.

When horizontal roll bending control of the intermediate rolls 5 and 6 is performed by horizontal roll bending devices 7' and 8', as shown in FIG.
, 8' impart horizontal roll bending to the work roll 5°6. As shown in Fig. 5, when horizontal roll bending is applied to the intermediate rolls 5 and 6 in the direction in which the longitudinal centers approach each other and both ends move away from each other, the cap between the work rolls 1 and 2 is placed in the longitudinal center of the work rolls 1 and 2. The gap at the end is small and the gap at both ends is controlled to be large.

The horizontal roll bending control of the intermediate rolls 5 and 6 is performed by the split rolls 9.1 of the horizontal roll bending device 13.14.
0, for example, as shown in FIG. 6, the intermediate rolls 5 and 6 are rolled horizontally so that the longitudinal center and both ends are separated from each other and the longitudinal center and both ends are close to each other. When roll bending is applied, the gap between the work rolls 1.2 is controlled so that it is large at the center and both ends and small at the middle.

Work roll 1 by vertical roll bending device 15
, 2, the gap between the work rolls 1 and 2 is controlled by operating the vertical roll bending device 15 to apply increase roll bending or decrease roll bending to the work rolls 1.2.

When controlling with a roll shift device, the work rolls 1.2 are moved in opposite directions in the longitudinal direction, one end of the work roll 1 is positioned near one width end of the rolling plate 16, and the work rolls 1.2 are moved in opposite directions in the longitudinal direction. One end of the work roll 2 on the side opposite to the work roll 1 is positioned near the other width end of the rolling mill 16, and rolling is performed.

In the above-mentioned rolling mill, the work roll 1.2 is held down by the intermediate rolls 5 and 6 from the front and back, so its horizontal rigidity is increased. Because there is no center of work roll 1,
2, the vertical rigidity of the work roll is reduced, the roll bending control of the work roll becomes easier, and complex shape control becomes possible by performing any one of the above-mentioned controls or a suitable combination thereof.

FIG. 7 shows another embodiment of the present invention. In this embodiment, on the small-diameter work roll 1 side, an intermediate roll 5 is used as in the case of FIG. 1.
, horizontal position control device 7 or horizontal roll bending device 7', horizontal roll bending device @13, etc., but on the work roll 2 side, the work roll 2 is a large diameter roll, and is installed around the intermediate roll and the intermediate roll. The device is omitted. By forming the grooves in this manner, the same control as in the case of FIG. 1 can be performed on the work roll 1 side.

In addition, in the embodiment of the present invention, a case has been described in which the intermediate roll and the device for controlling the intermediate roll are provided on both the upper and lower work rolls or on the upper work roll side, but it can also be implemented even if it is provided only on the lower work roll side. Of course, various changes may be made without departing from the gist of the present invention.

[Effects of the Invention] According to the rolling mill of the present invention, there is a gap between at least one of the pair of upper and lower work rolls and the pair of upper and lower backup rolls and the cut-out roll. A horizontal position control device comprising two offset intermediate rolls and controlling the horizontal position of the intermediate rolls, a horizontal roll bending device that applies horizontal roll bending to both end shaft portions of the intermediate rolls, with respect to the longitudinal direction of the intermediate rolls; A horizontal roll bending device that applies horizontal roll bending to an intermediate roll using split rolls divided into multiple parts, a vertical roll bending device that provides vertical roll bending to a work roll, and a roll that moves upper and lower work rolls in opposite directions in the longitudinal direction. Since the work roll is equipped with at least one of the shift devices, the horizontal rigidity is high and the vertical rigidity is low, and various shape controls can be easily performed. It has various advantages such as being able to prevent middle elongation or edge drops from occurring at the width end of the rolled plate, and being able to roll the cross-sectional shape into an accurate rectangular shape to obtain a product of good quality. It can have a great effect.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of one embodiment of the rolling mill of the present invention, Figures 2-
FIG. 6 is an explanatory diagram for controlling the intermediate roll in the rolling mill of FIG. 1, and FIG. 7 is an explanatory diagram of another embodiment of the rolling mill of the present invention. In the figure, 1 and 2 are work rolls, 5 and 6 are intermediate rolls, and 7.
8 is a horizontal position control device, 7' and 8' are horizontal roll bending devices, 9 and 10 are split rolls, 13 and 14 are horizontal roll bending devices, and 15 is a vertical roll bending device.

Claims (1)

[Claims] 1) Between the work roll of at least one of the pair of upper and lower work rolls and the pair of upper and lower backup rolls, and the backup roll, the roll is offset forward and backward in the rolling plate traveling direction with respect to the work roll rotation center. A horizontal position control device that interposes two intermediate rolls and controls the horizontal position of the intermediate rolls in a direction parallel to the rolling plate traveling direction; a horizontal roll bending device that applies horizontal roll bending to both end shaft portions of the intermediate roll; A horizontal roll bending device that applies horizontal roll bending to an intermediate roll using split rolls that are divided into multiple parts in the longitudinal direction of the intermediate roll, a vertical roll bending device that applies vertical roll bending to a work roll, and a vertical roll bending device that applies vertical roll bending to a work roll. A rolling mill comprising at least one roll shift device for moving the rolls in the opposite direction.