JPH0112562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-stage cluster rolling mill, and particularly to a high-reduction rolling mill that has excellent performance in controlling the shape of the rolling mill.

In recent years, high-reduction rolling mills that can reduce plate thickness by a large amount in one rolling are required from the viewpoint of improving productivity and saving energy.On the other hand, there are also demands for plate thickness accuracy and shape. It's becoming increasingly strict.

Multi-stage cluster type rolling mills are capable of cold rolling under high pressure.These multi-stage cluster type rolling mills have the advantage of being able to reduce the diameter of the work rolls, allowing for low rolling loads and high reduction. However, it is known that when the diameter of the work roll is reduced, the bending deformation of the work roll due to the rolling load increases and the shape of the rolled material becomes poor. , splitting the reinforcing roll in the axial direction and relatively changing the positions of their axes;
In other words, the reinforcing rolls are of a split type, and these split reinforcing rolls are extruded in a convex shape relative to the work rolls, and the intermediate rolls and work rolls, which bend due to the rolling load, are bent in the opposite direction by the reinforcing rolls, thereby increasing the wall thickness. A technique is used to obtain a flat rolled material with uniformity.

However, when the width of the rolled material is narrow, most of the rolling load is applied to the center of the roll, which not only makes it difficult for intermediate rolls and work rolls to bend along the reinforcing rolls, but also causes contact deformation between the rolls to occur at the center. This has the drawback that the effect of the convex deformation of the reinforcing roll is difficult to transmit to the work roll.

The present invention aims to eliminate the above-mentioned drawbacks of conventional multi-stage cluster rolling mills, and includes a pair of upper and lower work rolls, a pair of upper and lower intermediate rolls that support the work rolls, and a pair of intermediate rolls that support these rolls. In a multistage cluster rolling mill in which a plurality of supporting reinforcing rolls are vertically symmetrically arranged, a roll bending mechanism is attached to a metal chock supporting a set of two intermediate rolls, and the intermediate roll is attached to the metal chock, It is characterized by a configuration in which it is movable in the roll axis direction and can be moved independently in the rolling direction perpendicular to the roll axis direction, and its purpose is to take advantage of the characteristics of the reinforcing roll, The object of the present invention is to provide a multi-stage cluster rolling mill whose shape control function is greatly improved by a shape control mechanism using a roll shift method or a roll bending method.

The present invention has the above-mentioned configuration, and has two
A roll bending mechanism is attached to a metal chock that supports a set of intermediate rolls, and the intermediate rolls are mounted on the metal chock so that they can move in the roll axis direction and each can move independently in the rolling direction perpendicular to the roll axis direction. As a result, sufficient bending load can be applied to the intermediate rolls by the roll bending mechanism, and the symmetry of deformation of each intermediate roll is guaranteed and the load is uniform, and the work roll 2
It is possible to significantly reduce the bending deformation, vibration, and meandering in the rolling direction of the roll, and enables fine and rational shape control as a whole.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall arrangement mechanism of an embodiment of the present invention, and in the figure, a indicates a rolled plate material that is rolled in the direction of the arrow. The following mechanism is provided by the housing 10.

In the figure, 2 is a pair of upper and lower work rolls, 3 is a set of two intermediate rolls, 4 is a set of three reinforcing rolls, 5 is a metal chock of the same reinforcing roll, 6 is a support frame of the same metal chock, and 7 is a set of intermediate rolls. It is a metal chock, and the same metal chock 7 has two upper and lower parts each.
The intermediate rolls 3 of this set are installed so as to be movable together or independently in the axial direction of the rolls by a known mechanism not shown, and as described later, with respect to a vertical plane passing through the axes of the upper and lower work rolls 2. It is installed so that it can be displaced symmetrically, that is, independently movable (or freely) in the rolling direction perpendicular to the roll axis direction (in the direction of the arrow in FIG. 2). 8 is a metal chock of the work roll 2, and 9 is a rolling device.

Further, 11 is a hydraulic cylinder that applies a bending force to the work roll 2, 12 and 13 are hydraulic cylinders attached to the metal chock 7 that applies a bending force to the intermediate roll, and 14 is a hydraulic cylinder that lifts the reinforcing roll metal chock 5.
Reference numeral 15 denotes an eccentric wheel, which is fitted onto the reinforcing roll 4. Further, the reinforcing roll 4 is divided into a plurality of parts in the axial direction of the fixed shaft 5a, and the bearings of the individual split reinforcing rolls 4' are eccentric with respect to the axis of the shaft 5a, and the eccentricity is adjusted by an adjustment device (not shown). ring 15
By turning the reinforcing rolls 4', each divided reinforcing roll 4' can be adjusted individually, and the crown of the reinforcing roll 4 as a whole can be adjusted as shown in FIG.

Further, as shown in FIG. 2, in the metal chock 7 of the intermediate roll 3, the bearing portions 16, 16 of each intermediate roll 3, 3 are not directly assembled into the metal chock 7, but are mounted on separate inner chock 17, 17.
guide holes 7a, 7a of metal choke 7 through
With a gap α between the guide hole 7a and the inner choke 17, both intermediate rolls 3, 3 move independently in the horizontal direction (in the direction of the arrow) perpendicular to the roll axis direction. Furthermore, the structure is such that the rollers can be moved independently or together in the roll axis direction by a known mechanism not shown.

The illustrated embodiment has the above-mentioned structure. Next, the function and effect will be explained. In general, the shape of the rolled plate material a is based not only on the elastic deflection of the rolls but also on the non-uniformity of the contact surface pressure between the rolls. It is an extremely complex phenomenon that appears as a result of a combination of factors such as uneven flatness of the contact area, uneven temperature of each part of the roll, and wear of the roll. The larger the number, the more precise shape control becomes possible.

Furthermore, the reason why it is difficult to control the shape of the narrow plate is that even if the reinforcing roll 4 is deformed into a convex shape, the rolling load is transmitted near the center of the roll and the intermediate roll 3 does not bend along the reinforcing roll 4. Therefore, in order to bend the intermediate roll 3 sufficiently, it is sufficient to apply a roll bending force to the end of the intermediate roll 3, but when applying a roll bending force to a pair of intermediate rolls 3 with the roll arrangement as described above. If the two rolls are not deformed symmetrically, the small-diameter work roll 2 will also be deformed in the rolling direction, causing vibration and meandering due to interference with the rolled plate material a, and the individual intermediate rolls 3 will have to be bent. Since it is difficult to guarantee the symmetry of the deformation of the rolls when a deforming force is applied, the bearings of each roll are mounted on one metal chock 7.
It is reasonable to hold the metal chock 7 with a roll bending force and apply a load equally to the two rolls.

In the above-described embodiment of the present invention, the metal chock 7 (1) supporting the intermediate rolls 3, 3 is
) and the roll bending mechanism (hydraulic cylinder 1).
2, 13), and furthermore, the intermediate rolls 3, 3 are installed on the metal so that they can each independently move (freely) in the rolling direction perpendicular to the roll axis direction, so the roll bending mechanism As a result, a sufficient bending load can be applied to the intermediate rolls 3, 3, and the symmetry of deformation of each of the intermediate rolls 3, 3 is ensured and the load is uniform, which prevents bending deformation and vibration of the work roll 2 in the rolling direction. , meandering is significantly reduced, and fine and reasonable shape control performance is obtained as a whole.

Furthermore, the metal chock 7 of the intermediate rolls 3, 3
By installing the bearing part 16 of each intermediate roll 3, 3 on the metal chock 7 with the inner chock 17, when replacing the rolls, the intermediate roll can be easily and quickly removed and inserted in one operation. It also has the great advantage of being able to do it without damaging the roll.

Furthermore, while taking advantage of the above-mentioned advantages, if the roll diameter locally fluctuates due to roll wear or the like, and the intermediate roll 3 is subjected to uneven rolling load by the plurality of reinforcing rolls 4. for,
Both the intermediate rolls 3, 3 can be moved individually or together in the roll axis direction by an appropriate well-known mechanism not shown, so that pressure can be uniformly applied to the contact surface of the work roll 2, and the rolls This has the great advantage of not only improving service life but also being able to always transmit the best rolling load.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is a structural diagram of the bearing portion of the intermediate roll shown in FIG. 1, and FIG. 3 is an explanatory diagram of the operation of the same embodiment. 2...Work roll, 3...Intermediate roll, 4...
...Reinforcement roll, 7...Metal chock of intermediate roll, 7a...Guide hole, 12, 13...Roll bending mechanism (hydraulic cylinder), 16...Bearing portion of intermediate roll, 17...Inner chock.

Claims (1)

[Claims] 1. In a multi-stage cluster rolling mill in which a pair of upper and lower work rolls, a pair of upper and lower intermediate rolls that support the work rolls, and a plurality of reinforcing rolls that support these rolls are vertically arranged symmetrically,
A roll bending mechanism is attached to a metal chock that supports a set of two intermediate rolls, and the intermediate rolls are movable on the metal chock in the roll axis direction and each independently in a rolling direction perpendicular to the roll axis direction. A multi-stage cluster rolling mill characterized by a movable configuration.