JPS5853309A - Multistage cluster rolling mill - Google Patents

Abstract

PURPOSE:To improve functions for controlling shapes markedly by providing roll bending mechanisms to the metal chocks of the intermediate rolls of multistage cluster rolling mills and mounting rolls to said metal chocks movably at right angles to an axial direction. CONSTITUTION:In multistage cluster rolling mills, the bearing parts 16 of intermediate rolls 3 are held in the guiding holes 7a of metal chocks 7 via inner chocks 17 to provide clearances alpha between the holes 7a and the chocks 17. The rolls 3 are moved independently or simultaneously in an axial direction or the rolling direction at right angles to the axial direction. Roll bending mechanisms 12 are provided to the chocks 7, and sufficient bending load is applied to the rolls 3. The defective deformation, oscillations, snaking, etc. of work rolls 2 are reduced by said mechanisms and the crown adjustment with the split backup rolls, whereby the rational performance for controlling of shapes is obtained.

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, from the viewpoint of improving productivity and saving energy, there has been a demand for high-reduction rolling mills that can significantly reduce plate thickness in one rolling process.On the other hand, requirements for plate thickness accuracy and shape have increased. is also 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. As a method, the reinforcing roll is divided in the axial direction and the positions of their axes are relatively changed, that is, the reinforcing roll is made into a split type, and these split reinforcing rolls are extruded in a convex shape with respect to the work roll, A technique has been adopted in which intermediate rolls and work rolls that are bent by the rolling load are bent in the opposite direction by reinforcing rolls to obtain a flat rolled material with uniform wall thickness.

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

The present invention aims to solve the above-mentioned drawbacks of conventional multi-stage cluster rolling mills. In a multi-stage cluster rolling mill in which multiple reinforcing rolls supporting the rolls are vertically symmetrically arranged,
A roll bending mechanism is attached to a metal chock that supports a front intermediate roll, and the intermediate rolls are equipped to the metal chock so that they can be moved in the roll axis direction and independently movable in the rolling direction perpendicular to the roll axis direction. The purpose is to take advantage of the characteristics of the reinforcing roll and significantly improve the shape control function using a shape control mechanism using roll shifting and roll inding methods. The main feature is that it provides a multi-stage cluster rolling mill.

(3) The present invention has the above-mentioned configuration, in which a roll inding mechanism is attached to a metal chock that supports an intermediate roll, and the intermediate roll is movable in the roll axis direction on the metal chock, and the intermediate roll is movable in the roll axis direction. Since the rolls are each movable independently in the rolling direction perpendicular to the rolling direction, the rolls can apply sufficient bending load to the intermediate rolls by the bending mechanism, and the deformation of each intermediate roll is guaranteed to be symmetrical and even. It is possible to significantly reduce the load, bending deformation of the work roll (2) in the rolling direction, vibration, and meandering, and enable detailed 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, in which (a) shows a rolled plate material that is rolled in the direction of the arrow; The following table mechanism is provided by the housings (10) provided on both sides.

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 reinforcing roll, ( 6) is the supporting frame of the metal chock (the force is the metal chock of the intermediate roll, and the intermediate roll (3) of the set of two upper and lower hooks is rotated in the roll axis direction by a known mechanism not shown). The upper and lower work rolls (2) are installed movably together or independently, and are displaceable symmetrically with respect to a vertical plane passing through the axes of the upper and lower work rolls (2), that is, at right angles to the roll axis direction, as described later. (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 pending force to the work roll (2), (12) and (13) are hydraulic cylinders attached to the metal chock (7) that applies a pending force to the intermediate roll, and (14) is a hydraulic cylinder that lifts the reinforcing roll metal chock (5), (1
5) is an eccentric wheel fitted to the reinforcing roll (4). Further, the reinforcing roll (4) is divided into a plurality of pieces in the axial direction of the fixed shaft (5a), and each split reinforcing roll (4')
The bearing is eccentric with respect to the axis of the shaft (5a), and by turning the υ eccentric wheel (15) using the adjustment device shown in the figure, each divided reinforcing roll (4) can be adjusted independently. The crown of the reinforcing roll (4) as a whole can be adjusted as shown in Fig. 3.

In addition, as shown in Fig. 2, the bearings (16) (16) of the intermediate rolls (3) (3) are directly assembled into the metal chock (7). No, another inner chock (17) (17)
Through the metal chock (force guide hole (7a) (7a
), and there is a gap (α) between the guide 9 hole (7a) and the inner chock α force, so that the rain intermediate rolls (3) (3) are held in the horizontal direction ( each can be moved independently (in the direction of the arrow), and further,
The structure is such that they are movable independently or together in the axial direction of the roll by a known mechanism not shown.

The illustrated embodiment has the above-mentioned structure, and its functions and effects will be explained below. Generally, rolled plate material (1)
The shape of the roll is determined not only by the elastic deflection of the rolls but also by the unevenness of the flatness of the roll contact area due to the unevenness of the contact surface pressure between the rolls.
The so-called thermal crown caused by uneven temperature at various parts of the roll and the wear and tear of the roll appear as a combined result, and are extremely complex. Therefore, the more shape control methods there are, the more detailed the shape control. Become.

In addition, it is difficult to control the shape of the narrow plate because even if the reinforcing roll (4) is deformed into a convex shape, the rolling load is transmitted near the center of the roll, causing the intermediate roll (3) to turn into the reinforcing roll (4). This is to prevent the intermediate roll (3) from bending as it heals, so in order to orient the intermediate roll (3) sufficiently, it is sufficient to apply a roll bending force to the end of the intermediate roll (3). When a roll pending force is applied to (3), if the two rolls are not deformed symmetrically, the small diameter work roll (2) will also be deformed in the rolling direction.
To avoid causing vibration or meandering due to interference with the rolled plate material (a), if a roll binding force is applied to each intermediate roll (3), it is difficult to ensure the symmetry of deformation between the rolls. Place the bearing in one metal chock (
7) and apply a roll pending force to this metal chock (force) to apply the load equally to the two rolls.

Thus, in the above-described embodiments of the present invention, the intermediate roll (
3) A roll bending mechanism (hydraulic cylinder 12.13) is attached to the metal chock (1 piece) that supported (3), and intermediate rolls (3) (3) are attached to the metal in the roll axis direction. Since they are each independently movable (freely) in the rolling direction perpendicular to the rolling direction, a sufficient bending load can be applied to the intermediate rolls (3) (3) by the roll bending mechanism, and the intermediate rolls (3) ( 3) The symmetry of individual deformation is ensured and the load is uniform, and the bending deformation, vibration, and meandering of the work roll (2) in the rolling direction are significantly reduced, resulting in fine and rational shape control performance as a whole. is obtained.

In addition, intermediate rolls (3) (31 metal chocks (7)
) is one piece, and the bearing part (1
6) with the inner chock (17) and metal chock (
By installing the intermediate roll in a fixed position, there is a great advantage that when replacing the roll, the intermediate roll can be removed and inserted in one operation easily, quickly, and without damaging the roll.

In addition, while taking advantage of the above-mentioned advantages, local fluctuations in the roll diameter due to roll wear etc. may cause intermediate rolls (
3) is subjected to uneven rolling load by multiple reinforcing rolls (4), the rain intermediate roll (3) (
The work rolls (2) are moved individually or together in the roll axis direction by an appropriate known mechanism not shown.
This has the great advantage of being able to uniformly apply pressure to the contact surface of the roll, improving roll life and always transmitting 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 the drawing]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing one embodiment of the present invention.
FIG. 6 is a structural diagram of the bearing portion of the intermediate roll shown in the figure, and FIG. 6 is an explanatory diagram of the operation of the same embodiment. 2: Work roll, 3: Intermediate roll, 4: Reinforcement roll,
7: Middle roll metal chock, 7a guide hole, 1
2.13: Roll (unding mechanism (hydraulic cylinder),
16: Bearing part of intermediate roll, 17: Inner chock. Sub-agents: 2 patent attorneys and non-Kaimoto important literary figures

Claims (1)

[Claims] 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 the rolls, and the intermediate rolls are installed 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. A multi-stage cluster rolling mill characterized by its configuration.