JPS62104610A - Supporting method for split type backup roller for multistage rolling mill - Google Patents

Abstract

PURPOSE:To reduce an influence exerted on a surface shape of a material to be rolled, by a variation of a rolling load, by supporting a backup roller so that the rigidity of the supporting point at the center becomes maximum, among respective supporting points of the backup roller. CONSTITUTION:A backup roller 1 is constituted of a roller shaft 9, and plural rollers 10 which have been divided into the axial direction and have been fitted to the roller shaft 9. Also, the roller is supported by attaching saddles 11, 11a which have been provided between the respective rollers and on both ends. Among those saddles 11a, the saddle 11a at the center is supported so that a rigidity K1 in the vertical direction against the roller shaft 9 becomes maximum.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for supporting a split backup roll for a multi-high rolling mill.

(Prior art) A split type backup roll supports a work roll that directly contributes to rolling from behind, transmits the rolling load to the work roll, and also forcibly deflects the work roll as needed to control the rolling material. It is used for the purpose of controlling the planar shape of.

Fig. 5 shows a side view of a 20-high rolling mill, where l is a split type backup roll (hereinafter simply referred to as backup roll), 2.3 is an intermediate roll, 4 is a work roll, and 5.6
are upper and lower housings, 7 is a support, and by raising and lowering the upper housing 5 using a lowering device (not shown), the roll I? A rolling load is applied to the material to be rolled 8 via #1.2°3.4 to perform rolling.

As shown in FIG. 6, the backup roll 1 consists of a roll shaft 9 and a plurality of rollers 10 divided in the axial direction and fitted to the roll shaft 9. Taza 1-le I+.

11a is supported by attaching it to the housing 5.6. Of these saddles 11.11a, positions 1. The saddle I+ is housing 5.
．． A saddle Ila fixed to the roll shaft 6 and positioned between the rollers 10 is mounted so as to be movable in a direction perpendicular to the roll shaft 9. The movement mechanism of this saddle Ila is as follows:
For example, as will be described later, there is a system that uses an eccentric ring behind the saddle Ila and utilizes the swinging movement caused by the rotation of the eccentric ring, or a system that moves the saddle by pushing a wedge.

Then, by appropriately moving the saddle lla and bending the backup roll I by giving a slight displacement as shown in FIG. 7, the crown of the work roll 4 is adjusted and the planar shape of the rolled material 8 is is designed to be controlled.

(Problems to be Solved by the Invention) The rigidity K of the support point of the backup roll 1 supported as described above, that is, the saddle lla (indicates the magnitude of displacement with respect to a load in the direction perpendicular to the roll axis, per unit load) (expressed as the amount of deformation), the stiffness of the saddle Ila having a moving mechanism is usually smaller than the stiffness of the fixed saddle 11 due to the complexity of the moving mechanism.

That is, the backup roll 1 is fixedly supported at both ends and elastically supported at the middle.

The reaction force against the rolling load applied to the work roll 4 by the material to be rolled 8 is transmitted to the backup roll 1 via the intermediate roll 2.3, but the saddle Ila located at the intermediate part of the backup roll l has a rigidity as described above. Since the backup roll 1 is in a low elastic support state, the work roll 4
And the intermediate roll 2.3 will be greatly deflected. Figure 8 shows the deflection (δ) distribution of the work roll 4. When viewed from the center of the plate, there is a large deflection from the side edges of the rolled material 8 to both sides, and this tendency becomes more pronounced as the rolling load (P) increases. It shows that there is. Therefore, the difference (Δδ) between the deflection claws of the work roll 4 at the center and side edges of the rolled material 8 is determined by the rolling load (P
) increases with

As described above, according to the conventional method of supporting the backup roll 1, there is a large difference in the amount of deflection of the work roll 4 between the central part and the side edge parts of the plate of the material to be rolled 8. The problem is that the surface shape becomes non-uniform, and the surface shape also fluctuates due to changes in rolling load, making shape control difficult.

The present invention has been made in view of such problems, and an object of the present invention is to provide a method for supporting a split type backup roll for a multi-high rolling mill in which changes in rolling load have less influence on the surface shape of a rolled material. .

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a backup roll consisting of a roll shaft and a plurality of rollers that are divided in the axial direction and fitted to the roll shaft. Support points are provided at both ends, and the rigidity of the central support point in the direction perpendicular to the roll axis is maximized.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of a 20-high rolling mill to which the method according to the present invention is applied, and FIG. 5 used in the description of the conventional example mentioned above is used for its side view.

In Figure 1, backup roll I, intermediate roll 2
．． 3. Work roll 4. Upper and lower housing 5゜6, strut 7
A conventionally known 20-high rolling mill is constructed.

The backup roll (2) is arranged between both ends of its roll shaft 9 and between the rollers (10) and has a saddle (11.) attached to the housing (5.6). Supported by IIa. Of these saddles 11.11a, the two saddles 11 located in the center of the roll axis 9 are fixed to the housing 5.6 by tension bolts I2, and the two saddles 11a located on both sides are moved by a known saddle movement method described later. The mechanism allows movement in a direction perpendicular to the roll axis 9.

This saddle moving mechanism has an eccentric center of rotation.
llll3 and the eccentric shaft 1 by forming a rolling bearing on the inner surface.
3, and a saddle block 15 that is interposed between the eccentric ring 14 and the saddle lla. , so that only motion in the direction perpendicular to the roll shaft 9 can be transmitted to the saddle Ila via the saddle block 15. Therefore, by appropriately rotating the eccentric shaft 13, the saddle Ila can be moved.

By supporting the backup roll l as described above, the rigidity of the fixed saddle + 1 is 1, while the rigidity of the saddle lla having the saddle moving mechanism is higher than K3.As a result, the backup roll 1 is the third As shown in the figure, it is fixedly supported at the center and elastically supported on both sides.

Therefore, even if the backup roll l receives a reaction force against the rolling load, the amount of deflection is small as a whole because the center portion is fixed, and even if the rolling load changes, the variation in the amount of deflection is small.

For this reason, the 20-high rolling mill having the backup roll l supported by the method according to the present invention is used to roll a sheet with a width of 5Q.
When the rolled material 8 of 0 mm is rolled, as shown by the solid line C in FIG.
The variation in the difference (Δδ) in the amount of deflection of the work roll 4 between the tentative center portion and the side end portions is smaller than in the conventional case as shown by the broken line A. If a moving mechanism is provided for all the saddles 11.11a (all the suspension rigidities are the same (K, -, -3), the difference in the amount of deflection (
Δδ) decreases compared to when using the conventional support method (broken line A), but when using the support method according to the present invention (solid line C)
becomes larger than

As described above, the difference (Δδ) in the deflection of the work roll 4 between the tentative center portion and the side end portions of the rolled material 8 is small, and as a result, the bending variation with respect to changes in the rolling load (P) is reduced.
The shape of the east face of the rolled material 4 is made uniform.

Note that the rigidity of the saddle Ila can be changed mainly by modifying the saddle moving mechanism. For example, in FIG. 2, the eccentric ring may be made hollow and its wall thickness or length Q may be changed.

(Effects of the Invention) As is clear from the following explanation, according to the present invention, the backup roll is supported such that the rigidity of the central support point among the support points of the backup roll is maximized. , the deflection of the backup roll against the rolling load is small, and there is little variation in deflection even when the rolling load changes, so changes in the rolling load have less of an effect on the surface shape of the rolled material, making shape control easier. It has the following effects.

[Brief explanation of drawings]

Figure 1 is a sectional view of a 20-high rolling mill to which the method according to the present invention is applied, taken along line 1-1 in Figure 5, Figure 2 is a sectional view taken along line ■-■ in Figure 1, and Figure 3 is a backup. A front view explaining the support state of the roll, Figure 4 is rolling? ;! Figure 5 is a side view of a 20-high rolling mill, and Figure 6 shows the application of the conventional backup roll support method at the line 11 in Figure 5. FIG. 7 is a front view illustrating the support state of a conventional backup roll, and FIG. 8 is a diagram showing the deflection distribution of the rolling load. ■... Backup roll, 9... Roll axis, 10...
- Roller, 11.11a...saddle (support point). Patent Applicant Kobe Steel Co., Ltd. Agent Patent Attorney Mr. Maeda and 2 others 3rd! ! ! 4th zu

Claims (1)

[Claims] (1) A backup roll consisting of a roll shaft and a plurality of rollers divided in the axial direction and fitted to the roll shaft, with support points provided between each roller and at both ends, and a support point at the center of these support points. 1. A method for supporting a split backup roll for a multi-high rolling mill, characterized by supporting the roll in such a way that the rigidity in the direction perpendicular to the roll axis is maximized.