JPS608883B2 - Multi-high rolling mill with shape control function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-high rolling mill equipped with a mechanism for controlling the shape of rolled material.

In recent years, in order to control the thickness shape of rolled material in the width direction,
Although various work roll pending methods for four-high rolling mills have been developed and implemented, conventional roll pending methods have had limitations in their ability to control the shape of rolled material.

In other words, in order to obtain a rolled product with a good shape, especially a small change in thickness in the width direction, it is necessary to minimize deformation of the work rolls due to rolling loads, etc., and to increase the correction ability by roll pending. is important.

Conventional four-high rolling mills only have a vertical roll venting device, so the amount of crown correction of the roll is small, and only a simple parabolic shape is corrected. The middle elongation shape could be corrected.

Further, the effect was small for narrow plates of 1'2 or less of the roll axis length, and a good shape correction effect could not be obtained. The present invention has been made in view of the above-mentioned circumstances, and its gist is to form one of the upper and lower work rolls to have a small diameter so that the small diameter work roll can be adjusted between the axes of the upper and lower backup rolls. The small-diameter work roll horizontal bending device is disposed on the small-diameter work roll shifting side, and the vertical bending device is provided on the work roll. Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in a rolling mill consisting of upper and lower work rolls 1 and 2 and upper and lower backup rolls 3 and 4 that support the upper and lower work rolls, the lower work roll 2 is The lower work roll 2 is formed to have a small diameter within an allowable range, and the lower work roll 2 is placed at a position suitably shifted downstream from the reduction line connecting the axes of the upper and lower backup rolls 3 and 4.

When the rolled material 5 is subjected to reduction rolling in this state, the lower work roll 2 is manipulated so as to escape to the shifted side. In order to perform shape control using this sagging, as shown in FIG. 2, the lower workpiece is pressed against the outer circumferential surface of the lower work roll 2 on the side where the rolling line is shifted.

A presser roll 6 of approximately the same length as the lower work roll 2 is arranged to adjust the horizontal sag of the roll 2, and in contrast to the presser roll 61, a reinforcing roll 7 is suitably divided into a plurality of parts in the roll width direction. is provided on the shifted side of the rolling line to support the presser roll 6. Each reinforcing roll 7 is supported by a suitable support 8, and the support 8 connects the lower work roll 2 and the presser roll 6 by a screw rod type (or cylinder type, etc.) moving device 10 provided in the housing 9. It is configured to be movable in both the linear direction and the horizontal direction. Further, as shown in Fig. 3, double chocks are provided at both shaft ends of the upper and lower work rolls 1 and 2, and a cylinder is provided in each chock, so that the upper and lower work rolls 1 and 2 are bent in the vertical direction. A pending device 12 is provided.

In the four-high rolling mill having the above configuration, when controlling the shape of the rolled material 5, the pressing force applied to the presser roll 6 via the reinforcing roll 7 is individually adjusted by the operation of the moving device 10 to adjust the pressing force. The displacement of the lower work roll 2 is defined as a vertical displacement, and the movement of the lower work roll 2 is freely adjusted at each part in the length direction.

At this time, if the reinforcing roll 7 is strongly pressed against the presser roll 6, the gap between the upper and lower work rolls in that area will decrease, and the thickness of the rolled material 5 in that area will decrease, and conversely, the reinforcing roll will When the pressing force 7 is weakened, the plate thickness at that portion increases. Further, by operating the moving device 10, each of the reinforcing rolls 7 provided in a plurality in the width direction can be adjusted to move simultaneously in a direction in which they are pressed toward the presser roll 6 side or moved away from the presser roll 6 side.
By adjusting the position of the reinforcing roll 7 in this way, it is possible to freely adjust the roughness of the lower work roll 2 at a plurality of locations, so that the shape of the rolled material 5 can be arbitrarily controlled.

Furthermore, by combining the above operation with the operation of the pending devices 12 provided on the upper and lower work rolls 1 and 2, the shape of the rolled material 5 can be controlled with high precision over a wide range.

In the above embodiment, the lower work roll has a small diameter and is shifted to the downstream side of the rolling line, but the upper work roll may have a similar configuration, or the lower work roll may be used as a presser roll and a reinforcing roll. A structure that can move in parallel to the reinforcing roll may be added, and a structure that can move only the presser roll to the reinforcing roll and only the reinforcing roll to the lower work roll and the relief roll may be added, Furthermore, the vertical pending device may be provided for each work roll or individually, and it goes without saying that various modifications may be made without departing from the gist of the present invention.

As described above, according to the present invention, {l) One of the work rolls is made small in diameter and is placed shifted to the downstream side of the rolling line, and is controlled from the horizontal direction, so that a large horizontal bend can be achieved and the vertical calculation crown The rolling amount can be increased, the rolling force can be reduced, the rolling power can be reduced, and the control ability can be increased.

Senzo: High precision and wide range control can be achieved by using vertical control.

{lil) The force required for adjustment is small, so no marks are left.

(I) By individually adjusting the movement of the split reinforcing rolls that support the presser rolls, it is possible to control the complex shape of the composite rolls.

M Work roll drive becomes possible.

Demonstrates excellent effects such as

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a rolling mill of the present invention, FIG. 2 is a view taken in the D direction of FIG. 1, and FIG. 3 is a view taken in the M direction of FIG. 1. 1, 2... Work roll, 3, 4... Backup roll, 5... Rolled material, 6... Presser roll, 7
...Reinforcement roll, 10...Movement device, 12...
...pending device. Figure 1 Figure 2 Figure 3 Key

Claims (1)

[Claims] 1. In a rolling mill equipped with a pair of upper and lower work rolls and a pair of upper and lower back-up rolls, one work roll is formed to have a smaller diameter than the other work roll, and the small-diameter work roll is connected to the other work roll and the small-diameter workpiece. The back-up roll on the roll side is appropriately shifted in the rolling direction, and a horizontal bending device that bends the small-diameter work roll as desired is provided on the shifted side of the small-diameter work roll, and the work roll is bent vertically. A multi-high rolling mill having a shape control function characterized by being equipped with a device.