JPS6363504A - Horizontal deflection control device for work roll of rolling mill - Google Patents

Abstract

PURPOSE:To improve the quality of a roller stock by juxtaposing intermediate support rolls and back-up support rolls on the offset side of work rolls and determining the contact barrel length of both the support rolls at the size shorter than the max. rolling width. CONSTITUTION:The intermediate support rolls 16 and the back-up support rolls 17 are disposed on the offset side of the respective work rolls 2, 3. The rolls 16 are formed to the barrel length approximately the same as the barrel length of the rolls 2, 3 and the barrel length of the rolls 17 are set shorter than the barrel length of the rolls 2, 3 and the rolls 16 and smaller than the max. rolling width size of the rolling mill. The horizontal deflection of the rolls 2, 3 is controllable when the pressing forces of cylinders 20 are exerted via the rolls 16, 17 to the work rolls 2, 3 at the time of reversing pass of the rolling stock. The quality of the rolled stock is thereby improved and the initial cost is reduced as the construction of the support rolls is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling mill, and more particularly to a work roll horizontal deflection control device suitable for preventing horizontal deflection of a small diameter work roll of a rolling mill.

[Conventional technology]

When cold rolling is performed using small-diameter work rolls, horizontal deflection of the work rolls tends to occur due to the influence of torque tangential force generated between the work rolls and the upper and lower intermediate rolls. Measures such as supporting the rolls with support rolls have been taken.

For example, Utility Model Application No. 60-166404, Utility Model Application No. 60-1
In the rolling mill disclosed in Japanese Patent No. 76801, an intermediate support roll is brought into contact with the entire length of the work roll cylinder, a plurality of split support rolls are arranged with the intermediate support roll interposed, and the split support rolls are connected to the cylinder. The work roll is pressed against the work roll through the intermediate support roll, and in this way, a force in the opposite direction to the work roll horizontal deflection force is applied to control the work roll horizontal deflection. Further, as other means, for example, JP-A-59-18
As disclosed in Publication No. 5509, a total of two narrow support rolls are arranged in contact with both body ends of the work roll without intervening intermediate support rolls, and these narrow support rolls are arranged so that the width of the rolled material is fixed. A method has been proposed for controlling the horizontal deflection of a work roll by moving it according to the following.

[Problem that the invention seeks to solve]

In the above-mentioned prior art, the means for preventing horizontal deflection of the work roll by using an intermediate support roll and a plurality of split support rolls is such that the split support rolls are arranged at intervals over the entire length of the work roll. Although effective horizontal deflection control can be achieved, the use of split support rolls requires the use of multiple roll bearings, roll pressure cylinders, and the need to increase the rigidity of the bearing saddles, making the structure of the roll assembly difficult. The product cost is increased due to the complexity and increase in the number of parts, and since narrow split support rolls are used, there is a risk of wobbling of the support rolls when performing high-speed rolling.

Furthermore, among the above-mentioned conventional technologies, the one in which movable narrow-width support rolls are brought into contact with both body ends of the work roll to prevent horizontal deflection of the work roll has a simple structure;
Since the support roll has a small width and only supports both body ends of the work roll, the effect of preventing roll horizontal deflection is small.

In addition, since the support roll has a small width, the contact pressure of the support roll against the roll is large, and as a result, the pressure applied to the work roll is uneven, causing uneven gloss on the rolled material, and furthermore, the work roll body surface Support roll marks remain on the roll, and when rolling a rolled material wider than the position where the support roll mark is present, the rolled material may be damaged by the support roll mark.

The present invention has been made in view of the above points, and its purpose is to effectively prevent horizontal deflection of work rolls, and without causing uneven gloss or scratches on rolled materials. It is an object of the present invention to provide a horizontal deflection control device for a rolling mill of this type that performs high-quality rolling, has a simple structure, and is advantageous in terms of cost.

[Means for solving problems]

The present invention is configured as follows to achieve the above object.

First, a work roll of a rolling mill is arranged offset from other rolls arranged above and below this work roll,
An intermediate support roll that contacts the body surface of the work roll and a backup support roll that contacts the body surface of the intermediate support roll are arranged on the offset side of the work roll, and secondly, the backup support roll is a single piece. The roll has a body length shorter than the intermediate support roll, and the contact body length of the backup support roll with respect to the intermediate support roll is set to be shorter than the maximum rolling width of the work roll; A pressing mechanism is provided to press both shaft ends of the backup support roll toward the work roll.

[Function] The function of the present invention having the above configuration will be explained based on FIGS. 4 and 5.

Fig. 4 is an operation explanatory diagram showing the operating principle of the present invention, and Figs. 5 (a) and (b) show the operation when the rolled material is subjected to forward and reverse levering passes when the work rolls are offset. It is an explanatory view showing the direction of roll horizontal deflection force.

First, the relationship between the levering path and the work roll horizontal deflection force will be explained based on FIGS. 5(a) and 5(b).

In the figure, A is a work roll, and B is another roll (for example, an intermediate roll) arranged above and below the work roll. In such a rolling mill, when the intermediate roll (or upper and lower strong rolls placed above and below the intermediate roll) B is rotationally driven by a rotary machine, rolling torque is applied to the work roll A, but at this time,
A torque tangential force is generated between the work roll A and the intermediate roll B in the direction opposite to the progress of the rolled material. This torque tangential force becomes a factor of horizontal deflection, but the horizontal deflection force is
) and (b), even when the levering passes are performed in the forward and reverse directions, by offsetting the work roll as follows, it is possible to always apply the action in the same direction. That is,
First, the work roll A is offset in a predetermined direction by an amount of Q2 with respect to the axis perpendicular line XX of the intermediate roll B. In this example, the same figure (a).

As shown in (b), the axis perpendicular line Y-Y of the work roll A is offset to the right side in the drawing with respect to the axis perpendicular line X-X of the intermediate roll B.

In this case, as shown in FIG. 5(a), if the rolled material is passed from left to right (that is, work roll A is offset to the exit side in the rolling direction), work roll A and other rolls In addition to a torque tangential force opposite to the pass direction, a rolling load component force is generated on the offset side of the work roll A (in this example, in a direction opposite to the torque tangential force). This rolling load component is determined by the distance 01 between the axes of the work roll A and the intermediate roll B and the offset amount Q2. When the rolling load component force is made larger than the torque tangential force by adjusting the offset amount Q2, the difference between the torque tangential force and the rolling load component force (horizontal deflection force) acts on the offset side.

In addition, as shown in Figure 5(b), if the rolled material is passed in the opposite direction to that in Figure 5(a) (that is, the work roll is set on the entry side of the rolling direction), in this case, Both the torque tangential force and the rolling load component force are directed toward the offset side of the work roll, and these forces are combined and act on the offset side. Therefore, even in forward and reverse levering rolling, the work roll horizontal deflection force can always act in the same direction, and support rolls to counter this can also be installed on the offset side.

Therefore, as described above, the present invention arranges the backup support roll D on the offset side of the work roll A via the intermediate support roll C, and the contact trunk length L of the backup support roll D with respect to the intermediate support roll C.
1 is made shorter than the maximum rolling width L2 of the work roll as shown in FIG. Then, the horizontal deflection of the work roll is controlled as follows. That is, as shown in FIG. 4 (I), when a horizontal deflection force F is applied to the work roll A without a support roll in an area corresponding to the width L2 of the rolled material, only both ends of the work roll A are axially bent. Since the work roll is supported, the deflection deformation of the roll increases as it approaches the center of the work roll cylinder. Then, as in the present invention, if a pressing force Q in the opposite direction to the horizontal deflecting force F is distributed in Q/2 and applied to both shaft ends of the backup roll D by a pressing mechanism, the pressing force Q
is applied from the body of the backup support roll D to the body of the work roll A via the intermediate support roll C.
Depending on the magnitude of the pressing force Q, the horizontal deflection of the work roll can be controlled in various ways. For example, the ratio Q/F between the pressing force Q and the horizontal deflection force F is usually 1 to 1.3.
A value X in which the horizontal deflection shape of the work roll can be controlled in various ways within the range of Q/F of 1 to 1.3.

When increasing force is applied in order of Y..., Figure 4 (n)
to HV), various work roll horizontal deflection controls are possible.

Further, in the present invention, the trunk length of the intermediate support roll C is adjusted to the work roll trunk length A, and the pressing force of the backup support roll D is distributed and applied to the work roll A side via the intermediate support roll C. Therefore, an excessive load is not applied locally to the work roll A.
In addition, since the work rolls are not damaged, the rolled material can be rolled with high quality without uneven gloss or scratches.

Furthermore, since the present invention can effectively control the work roll horizontal deflection using a single backup support roll,
By simplifying the bearing structure of the support roll and the number of parts, it is possible to provide a rolling mill that is cost-effective and easy to maintain.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 is a longitudinal sectional view of a rolling mill that is an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a main part of the rolling mill of this embodiment showing the vicinity of the installation of work rolls, and FIG. 3 is a partial vertical cross-sectional view showing a part of FIG. 2 in an enlarged manner.

First, prior to explaining the main parts of this embodiment, the overall outline of the rolling mill will be explained based on FIG. In the figure, P is the rolling line, 1 is the mill housing, 2゜3 is the work roll, 4,
5 is an upper and lower intermediate roll, and 6.7 is an upper and lower reinforcing roll.

Each work roll 2, 3 is supported at both ends by bearing boxes 8, 9, and each upper and lower intermediate roll 4, 5 is supported at both ends by bearing boxes 10, 11.
Supported by

Bearing boxes 8 and 9 for supporting work rolls are attached to the mill housing 1.
The block 13a is arranged so as to be able to move up and down between a pair of positioning blocks 13a and 13b arranged oppositely in the window 12 of the block 13a.

Hydraulic cylinder 1 for roll bending installed in 13b
4 is supported. Further, the bearing box 10.11 for supporting the intermediate roll is supported by the cylinder 15 for bending the intermediate roll.

The work rolls 2 and 3 have bearing boxes 8 and 9 positioned by positioning blocks 13a and 13b, so that their axial vertical lines Y-Y are in a predetermined direction relative to the axial vertical lines XX of the intermediate rolls 4 and 5. They are arranged so as to be offset by a certain amount.

Next, the work roll horizontal deflection control (prevention) mechanism, which is the main part of this embodiment, will be explained.

16 is an intermediate support roll for controlling the horizontal deflection of the work roll; 17 is a backup support roll 17 that backs up the intermediate support roll 16; The backup support roll 17 is arranged on the offset side of each work roll 2, 3.

As shown in FIG. 2, the intermediate support roll 16 is formed to have approximately the same length as the work rolls 2 and 3, and is set so as to be in contact with the work rolls 2 and 3 over the entire length of their roll bodies. In addition, the backup support role 17 is
It is formed as a single piece, and its body length (contact body length that contacts the intermediate support roll 16) is made shorter than the work rolls 2, 3 and the intermediate support roll 16, so that it is smaller than the maximum rolling width of the rolling mill. It is set.

18 is a support roll bearing beam, 19 is a fixed support beam, and the support roll bearing beam 18 and the fixed support beam 19 are connected to the work rolls 2, 3 as shown in FIG.
The rolling line P is divided into upper and lower parts on the offset side of the rolling line P. In addition, each support roll bearing beam 18 is
Arranged facing the work roll 2.3, and inside,
A space for accommodating the intermediate support roll 16 and the backup support roll 17 is formed, and these rolls 17.16 are arranged in parallel in the roll storage space. Support roll bearing beam 18 at end
is supported on both sides. On the other hand, fixed support beam 1
9 is arranged parallel to the support roll bearing beam 18 and fixedly attached to the inside surface of the mill housing 1, and the support roll bearing beam 18 is fixedly attached inside the fixed support beam 19 in the rolling line direction (arrows G and H direction). The support roll bearing beam 1 is fitted so that it can move within the range of
Both outer ends of the support beam 8 are supported by respective suppression cylinders 20.degree. 20 built into both sides of the fixed support beam 19. Therefore,
The support roll bearing support beam 18 can move along with the support rolls 16 and 17 in the directions of arrows G and H following the reciprocating motion of each suppression cylinder 20, and the intermediate support roll 16 can move along the work roll 2 ( When it comes into contact with the body surface of 3), the work roll 2 (3) moves in the direction of arrow H.
In this state, the pressing force of the cylinder 20 is applied from both ends of the support roll bearing beam 18 to the work roll 2 (3) via the body surfaces of the bank-up support roll 17 and the intermediate support roll 16.

Furthermore, in the rolling mill of this embodiment, one of the two shaft ends 8 (9) of the work roll 2 (3) is made smaller in diameter than the other, as shown in FIG. The positioning block 1 is set so that it can be pulled out in the direction.
Among the positioning blocks 3a and 13b, one positioning block 13b on the side where the support rolls 16 and 17 are arranged can be opened outward (in the direction of arrow J) about the fulcrum 21. Therefore, the intermediate support roll 1
Beam 1 bearing 6 and backup support roll 17
8 and can be discharged from the inside of the mill housing to the outside. Further, the support rolls 16, 17 and the bearing beam 18 can be carried into the mill housing 1 from the outside by an operation opposite to this.

Therefore, in this embodiment, during the forward and reverse levering passes of the rolled material, horizontal deflection force is applied to the work roll 2 (3) from the direction indicated by the arrow in FIG. 2, but in this case, the work roll is placed on the offset side. When a pressing force is applied to both shaft ends of the pack-up support 1 to roll 17 via the bearing beam 18 by the cylinder 20.20, a force resisting the horizontal deflection force is generated as already described in the [Operation] section of the invention. is added to the work roll 2 (3) via the intermediate support roll 16, and can effectively control the horizontal deflection of the work roll.

In particular, in this embodiment, since the bearing of the backup support roll 17 can be made larger than that of the intermediate support roll 16, the support capacity of the backup support roll 17 can be increased, and as a result, the horizontal deflection control ability can also be easily increased. Can be done. Moreover, the horizontal deflection force of the work roll 2 (3) generated by rolling can be controlled by the force relationship with the suppression cylinder 2o. Therefore, if the offset amount of work roll 2 (3) is constant, the horizontal deflection force is determined by the rolling torque, rolling direction, width and tension of the rolled material, so the work roll horizontal deflection force calculated based on these data is By controlling the pressing force of the cylinder 20, the horizontal deflection of the work roll can be controlled.

In addition, in this embodiment, when rearranging the work roll 2 (3), the intermediate support roll 16. If the backup support roll 17 and bearing beam 18 are moved backward by the cylinder 20, even if the work roll 2 (3) is pulled out and moved in the axial direction, the work rolls can be rearranged without interfering with these parts 16, 18, etc. The support roll 16 can be carried out smoothly.
17 can be easily carried out of the housing together with the support roll support beam 18, efficiency in changing various rolls is improved and maintenance is facilitated.

Furthermore, according to this embodiment, the supporting force of the backup roll against the horizontal deflection force of the work roll can be dispersed via the intermediate roll 16, so that it is possible to effectively prevent the roll-rolled material from being scratched, and moreover, it is possible to effectively prevent the roll-rolled material from being damaged. [Effects of the Invention] As described above, according to the present invention, it is possible to effectively prevent horizontal deflection of the work roll, and moreover, the structure of the entire device can be made simple. To provide a horizontal deflection control device of this type that can perform high-quality rolling without causing uneven gloss or flaws, and has a simplified support roll structure to reduce manufacturing costs and is easy to maintain. be able to.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing essential parts of the above-mentioned embodiment, and FIG. 3 is an enlarged view of a part of FIG. 1. The main part sectional views and FIGS. 4 and 5 are operational state explanatory views that schematically illustrate the present invention and explain its operational state. 1... Mill housing, 2, 3... Work roll, 4
゜5...Upper and lower intermediate rolls, 6,7...Upper and lower reinforcement rolls,
16... Intermediate support roll, 17... Backup support roll, 18... Support roll bearing beam, 19... Fixed support beam, 20... Pressing mechanism (
cylinder), A...Work roll, B...Upper and bottom intermediate roll, C...Intermediate support roll, D...Backup support roll.

Claims (1)

[Claims] 1. A work roll of a rolling mill is arranged offset from other rolls arranged above and below the work roll, and on the offset side of the work roll there is a An intermediate support roll in contact with the intermediate support roll and a backup support roll in contact with the trunk surface of the intermediate support roll are arranged side by side, and the backup support roll is a single roll having a trunk length shorter than that of the intermediate support roll. , the contact trunk length of the backup support roll with respect to the intermediate support roll is set to be shorter than the maximum rolling width of the work roll, and further includes a pressing mechanism that presses both axial ends of the backup support roll toward the work roll. A horizontal deflection control device for a rolling mill work roll, comprising: 2. In claim 1, the pressing mechanism comprises:
It has means for calculating a work roll horizontal deflection force generated during rolling from the rolling load and rolling torque, and applies a pressing force to both shaft ends of the backup support roll according to the calculated work roll horizontal deflection force. Horizontal deflection control device for rolling mill work rolls. 3. In claim 1 or 2, the intermediate support roll and backup support roll are
The support roll bearing beam is supported by a support roll bearing beam that is removably installed in the mill housing, and both ends of the support roll bearing beam are supported by a cylinder that constitutes the pressing mechanism, and the pressing force of this cylinder is applied to the support roll. A horizontal deflection control device for a rolling mill work roll, which is configured to apply to the work roll from both ends of a bearing beam via the backup support roll and the intermediate support roll.